Product Instruction UniGear 550 Medium voltage, arc-proof, air … · 2018-12-13 · REF542plus multifunction protection and control unit 23 Hardware 23 Machine-user interface 23

UniGear 550Medium voltage, arc-proof, air-insulated,metal-clad switchgear

Product Instruction

AHTAdd:ARO Building - unit 3A-2, Victor Buencamino Street, Barangay Almanza I, LasPiñas City, Philippines Web: www.aht.com.ph Email:[email protected] Tel:+63(2)737 9300 Fax: +63(2)737 9301

Contents

Description04 Applications

Air-insulated05 Normal service conditions05 Standards05 Electrical characteristics

Metal-clad06 Compartments06 Main busbars06 Branch connections06 Earthing switch06 Earthing busbar06 Insulating bushings and shutters06 Cables06 Gas exhaust duct

Safety07 Interlocks07 Padlocks07 Locking magnets

Type tests08 Temperature rise08 Dielectric08 Apparatus making and breaking capacity08 Earthing switch capacity08 Mechanical operations

Arc proof09 Vacuum circuit-breakers - Vmax09 Insulating Monobloc

Vacuum circuit-breakers11 Vacuum circuit-breakers - Vmax11 Insulating Monobloc11 Operating Mechanism11 Truck11 Apparatus-Operator Interface

12 Standards

Uses and Features13 Block-type CTs13 Bushing-type current transformers13 Earthing switch ST1 -UG

Feeder protection14 General14 Applications and Features15 Recommended products

Transformer protection16 General16 Applications and Features

Motor protection17 General17 Applications and Features18 Recommended products

Communication19 General19 Utility Applications IEC 6185019 SPA19 LON19 IEC 60 870-5-10319 DNP V3.0

Industrial Applications20 Profibus DP V120 Modbus20 OPC

Arc protection21 General21 Applications and Features21 Recommended products

22 Selection guide

REF542plus multifunction protection and control unit23 Hardware23 Machine-user interface23 Central unit24 Communication24 Synchronization

25 Automatic transfer systems

Typical units and technical data26 Single-line diagram of the typical units27 Single-line diagram of the busbar applications27 Graphical symbols27 Technical data

Main Connection Example29 Incoming / outgoing - Bottom cables31 Incoming / outgoing - Top cables entry (Depth: 1650mm)33 Incoming / outgoing - Top busbar entry (Depth: 1650mm)35 Bus - tie36 Measurement37 Measurement (VTs)39 Bus-riser

02 Contents | UniGear 550

UniGear 550 | Description 03

Description

The UniGear 550 switchgear panel is the latest product to jointhe large family of UniGear products. UniGear 550 mirrors allthe construction characteristics of other UniGear standardpanels.

UniGear 550 can support a maximum panel current of 2,000A and it is designed to accommodate ABB Vmax/L circuit-breaker.

One of the most unique aspects of this panel is its size. It onlymeasures 550 mm in width, making it a very compact andversatile product.

It has been built so that it can be connected directly to theUniGear standard panel. In fact, it has the same overalldimensions (height and depth) and the same omnibus busbars,

allowing it to handle a maximum current value of up to 4,000 A.

The UniGear 550 can be positioned against the wall. This in turnallows all service and maintenance operations to be carried outdirectly from the front.

Accessing the cable area is particularly convenient by simplyremoving the base of the circuit-breaker compartment.

As a standard solution, it is possible to connect up to threesinglepole cables per phase (with a maximum cross-section of185 mm2 per panel up to 1,250 A and 500 mm2 per panel upto 2,000 A) or two cables per phase with a maximum crosssection of 300 mm2 per panel up to 1,2504 A and 800 mm2 perpanel up to 2,000 A).

The connection height of the cables in relation to the floor shouldbe 600 mm for the panel up to 1, 250 A and 565 mm for the1,600 A and 2,000 A panels.

As standard solution UniGear 550 uses toroidal currenttransformers (CTs) which are fixed onto a “CT Rod". As anoptional solution, the transformers can be fixed on a DIN rail.

The panel design is such that fixed voltage transformers (VTs)can be inserted into the front of the panel. The capacitive signalfor indicating the voltage present is connected directly to theinsulators which support the busbars on the cable side. Thesurge arresters can also be inserted in the cable area.

The UniGear 550 switchgear is fitted with the interlocks andaccessories needed to guarantee top level safety and reliability,both for the installation and the operators.

It has undergone all the tests required by the InternationalStandards (IEC) and Local Standards (for example the GB,Chinese and Russian GOST standards).

04 Description | UniGear 550

ApplicationsBusiness services, public and civil buildings- Shopping malls- Supermarkets- Telecom building- office buildings- Banks- Hospitals- Sports grounds- Playgrounds- Residential areas- Large infrastructures and civil works

Light industrial applications- Machinery- Automotive products manufacturing

- Electronics- Communications products processing- Tobacco- Wine processing- Food processing- Textile- Chemicals- Pulp and Paper- Cement

Transport- Airports- Ports

Power systems- Switching Stations

UniGear 550 | Air-insulated 05

Air-insulated

Normal service conditionsThe rated characteristics of the switchboard are guaranteedunder the following ambient conditions:- Minimum ambient temperature: -5℃- maximum ambient temperature: +40℃- Maximum relative humidity: 95%- Maximum altitude: 1,000 m a.s.1- Presence of normal, non-corrosive and uncontaminatedatmosphere

StandardsThe switchboard and main apparatus contained in it comply

with the following Standards:- IEC 62271-1 For general purposes.- IEC 62271-200 for the switchgear.- IEC 62271-102 for the earthing switch.- IEC 60071-2 For the insulation coordination,- IEC 62271-100 for the circuit-breakers.

UnlGear 550 has been certified as having satisfied therequirements of major shipping registers (LR RINA BV and GL)for use in marine Installations.

In accordance with the IEC 62271-200 Standard, UniGear 550is defined as follows:- Partition metallic (PM): This means the panel is equipped with

metallic shutters and partitions between the operating partsand an open compartment.

- Loss of service continuity (LSC2B): In other words, serviceof the main busbar and of the cable compartment is guaranteedwhen normal maintenance is being carried out in one of themain circuit compartments (e.g. circuit-breaker compartment).

- Internal arc classified (IAC AFLR): Panels classified as IACAFLR, have fulfilled the five criteria of the internal arc testsfrom the front, side and rear having fulfilling the five criteriaof the internal arc tests

Degrees of protectionThe degrees of protection of the switchgears conform with IEC60529 Standards.

UniGear switchboards are normally supplied with the followingstandard degrees of protection:- IP4X on the external housing.- IP2X inside the units.Color at the external surfaces: RAL7035

(1) Up to 4000A if coupled with other Unigear units(2) Panel for 1600-2000A is tested for 4s

IEC GB GB IEC

Rated voltage kV 12 12 12 17.5

Rated insulation voltage kV 12 12 12 17.5

Rated power frequency withstand voltage kV 1m 28 42 42 38

Rated lightning impulse withstand voltage kV 75 75 75 95

Nominal frequency Hz 50-60 50-60 50-60 50-60

Rated short-time withstand current kA 3s ...31.5 ...31.5 ...31.5 (2) ...31.5

Peak curent kA 80 80 80 ...80

Internal arc withstand current kA 1s ...31.5 ...31.5 ...31.5 ...31.5

Main busbars rated current (1) A ...4000 ...4000 ...4000 ...4000

Branch connections rated current A 630-1250 630-1250 1600-2000 630-1250

Electrical characteristics

06 Metal-clad | UniGear 550

CompartmentsEach UniGear 550 panel consists of three power compartments:apparatus, busbars and feeder, which are segregated from eachother by metallic partitions.

There are two panel versions available for closing the apparatusand feeder compartment doors: one version uses screws andthe other a central handle.

Each unit is fitted with an auxiliary compartment where all theinstruments and cabling are housed. Arc-proof switchgear isnormally provided with a duct to evacuate the gases producedby an arc. All units are accessible from the front, and themaintenance and service operations can therefore also be carriedout with the switchgear wall mounted.

Main busbarsThe busbar compartment contains the main busbar systemwhich is connected to the fixed upper isolating contacts of theapparatus by means of branch connections.

The main busbars are made of electrolytic copper-flat busbarsor a special copper section is used-and are normally coveredwith insulating material. There is a single busbar compartmentalong the whole length of the switchgear and this can be fittedwith segregations so as to divide each unit into compartments.

Branch connectionsThe feeder compartment contains a branch system that enablesa connection between the power cables and the fixed lowerisolating contacts of the apparatus.

The branch connections are made with flat busbars composedof electrolytic copper for the whole range of currents and arenormally covered with insulating material.

Earthing switchEach incoming/outgoing feeder compartment can be fitted withan earthing switch for cable earthing. This switch can also beused to earth the busbar system (measurements and bus-tieunits). The earthing switch has short-circuit making capacity.The position of the earthing switch can be seen from the frontof the switchgear by means of an indicator.

Earthing busbarThe earthing busbar is made of electrolytic copper. It runslongitudinally all round of the switchgear, thereby guaranteeingmaximum personnel and installation safety.

Insulating bushings and shuttersThe insulating bushings contained in the apparatus compartmentcontain the fixed contacts that enable a connection betweenthe apparatus, and the busbar and feeder compartmentsrespectively. The bushings are of a single-pole type and madeof epoxy resin. The shutters are metallic and are activatedautomatically as the apparatus is being moved from the racked-out position to the service position and vice versa.

CablesSingle and three-core cables - up to a maximum of twelve perphase - can be used depending on the rated voltage, the unitdimensions and the cable cross section. The cables are easilyaccessible from the front of the switchgear panel which can bewall mounted in the station.

Gas exhaust ductThe hot gases and incandescent particles produced by theinternal arc must be evacuated from the room. Therefore, a gasexhaust duct is positioned above the switchgear, running alongits entire length. Each power compartment is fitted with a flappositioned at the top. The pressure generated by the fault causesit to open, allowing the gas to pass into the duct.

The UniGear 550 switchgear is equipped with a complete rangeof solutions to deal with all requirements, irrespective of whetherevacuation is required directly at the end of the switchgear, orif solutions from the front or rear are requested. Some installations,such as those in the marine industry, do not allow the gasesto be conveyed outside the room and therefore dedicatedsolutions have been realized using expansion chambers andlongitudinal evacuation chimneys that not only guaranteepersonnel safety, but which conform with the relevant standards.

Metal-clad

UniGear 550 | Safety 07

Safety

The UniGear 550 switchgear is fitted with all the interlocks andaccessories needed to guarantee the high level of safety andreliability needed both during installation and for the operators.

InterlocksStandard safety interlocks, foreseen by the relevant standards,are necessary to guarantee the correct operation sequence.Other interlocks, available on request, must be considered inthe installation, service and maintenance procedures. Theirpresence guarantees the highest level of reliability even whenan accidental error occurs, and allows what ABB defines as an"error-free" system of interlocks.

PadlocksThe apparatus and feeder compartment doors can be lockedin the closed position by means of padlocks. These can beapplied to both door-closing versions, i.e. where screws areused or a central handle.

The operations needed to rack the apparatus in and out, andto open and close the earthing switch can be prevented byapplying the padlocks to the insertion slots of the relevantoperating levers.

The metallic segregation shutters can be locked by means oftwo independent padlocks in both the open and closed positions.

The switchgear is able to accommodate padlocks with diametersranging from 4 to 8 mm.

Locking magnetsThe locking magnets are used to make automatic interlocklogics without human intervention.

The apparatus racking-in/out and the earthing switchopening/closing operations can be prevented. The doors of theapparatus and feeder compartments can be locked in the closedposition. The magnets can be applied to both door closingversions.

The magnets operate with active logics and therefore the lackof auxiliary voltage makes the lock become operative.

The UniGear switchgear has undergone all the tests requiredby the international (IEC) and regional standards (including theChinese GB and Russian GOST standards). In addition, testsrequired by the main shipping registers (LR, DNV, RINA, BV andGL) have been carried out to ensure that the switchgear issuitable for use in marine installations.

The tests simulate situations which occur very rarely or neverin normal installations. For example, a short circuit at themaximum current level for which the installation has beendesigned is unrealistic because of the presence of current-limiting components (such as the cables) and because the poweravailable is normally lower than rated levels.

Each switchgear unit is also subjected to routine factory testsbefore delivery. These “functional” tests check that the switchgearis configured correctly according to the specific characteristicsof each installation.

Typical type tests include:- Short-time withstand current and peak withstand current tests- Temperature r ise tests and main circuit impendence

measurements- Dielectric test on the main and auxiliary circuits- Verification of making and breaking capacity of the apparatus- Verification of making and breaking capacities of earthing

switch- Mechanical operation tests- Arc-withstand testing

The shipping registers require that the switchgear be testedto ensure it remains unaffected by:- High ambient temperatures- Inclination- Vibration

Routine factory tests include: - Visual inspection and check- Mechanical sequence operations- Cabling check- Electrical sequence operations- Insulation testing- Resistance measurement of the main circuits

Type testsShort-time and peak withstand currentThe test ensures that the main power and earthing circuits areable to withstand the stresses inflicted by a short-circuit currentwithout being damaged. The earthing system of the withdrawableapparatus

and the earthing busbar of the switchgear are included in thetest. The mechanical and electrical properties of the main busbarsystem and of the top and bottom branch connections remainunchanged, even when a short circuit occurs.

Temperature riseThe temperature rise test is carried out at the rated current valueof the switchgear unit and is used to ensure that the temperaturedoes not become excessive inside the unit. During the test, boththe switchgear and any additional apparatus, such as circuitbreakers, contactors and switch disconnectors, are checked.An apparatus subject to testing in free air is able to withstandhigher rated currents than those connected to a switchgear unit,which means the rated current of the apparatus depends onthe characteristics of the switchgear and on the relevant ventilationsystem (natural or forced).

DielectricThese tests check if the switchgear is able to withstand lightningsurges and the power frequency voltage. The power frequencywithstand-voltage test is carried out as a type test, but alsoroutinely on every switchgear unit manufactured.

Apparatus making and breaking capacityAll circuit breakers are subjected to the rated current and short-circuit current breaking tests. Furthermore, they are also subjectedto the opening and closing of capacitive and inductive loads,capacitor banks and cable lines.

Earthing switch capacityThe earthing switch of the UniGear switchgear can be closedin case of a short circuit and is normally interlocked to avoidbeing used on live circuits. However, should this happen for anyone of several reasons, the safety of the personnel operatingthe installation is fully guaranteed.

Mechanical operationsThe mechanical testing of all the operating parts highlights thereliability of the apparatus. Experience in the electro-technicalsector shows that mechanical problems are one of the mostcommon causes of a fault in an installation.

The switchgear and apparatus it contains are tested by carryingout a high number of operations, higher than those which arenormally carried out in installations in service. Moreover, theswitchgear components are part of a quality program systemand are regularly taken up from the production lines and subjectedto mechanical life tests to verify that the quality is identical tothat of the components subjected to the type tests.

08 Type tests | UniGear 550

Type tests

Arc proof

When developing medium-voltage switchgear, personnel safetymust take priority, which is why the UniGear 550 switchgear hasbeen designed and tested to withstand an internal arc caused bya short-circuit current at the same level as the maximum short-time withstand level.

The tests show that the metal housing of the UniGear switchgearis able to protect personnel working near the switchgear shoulda fault occur that results in an internal arc.

An internal arc is among the most unlikely of faults, although it cantheoretically be caused by various factors, such as:- Insulation defects due to a deterioration in component quality,

which can be caused by adverse environmental conditions anda highly polluted atmosphere.

- Over-voltages of atmospheric origin or generated by the operationof a component.

- Incorrect operation resulting from not following proper proceduresor inadequate training of personnel in charge of the installation.

- Breakage or tampering of the safety interlocks.- Overheating of the contact area due to the presence of corrosive

agents or insufficiently tightened connections.- Small animals in the switchgear.- Material left behind inside the switchgear during maintenance

operations.

While the characteristics of the UniGear switchgear notably reducethe incidence of these causes, some of them cannot be eliminatedentirely.

The energy produced by an internal arc causes the followingphenomena:- An Increase in the internal pressure.- An increase in temperature.- Visual and acoustic effects.- Mechanical stresses on the switchgear structure.- Melting, decomposition and the vaporization of materials.

Unless suitably controlled, operators could incur serious injury dueto the shock wave, flying parts and the doors opening. In addition,they could be burned by the hot gases emitted by an internal arc.

The tests ensure that the compartment doors remain closed andthat no components are ejected from the switchgear even whenit is subjected to very high pressures. Additionally, the tests checkthat no flames or incendiary gases are emitted.

Moreover, the lack of holes in the external, freely accessible partsof the housing, and the assurance that all the connections to theearthing circuit remain intact, guarantee the safety of the personnelwho must access the switchgear after a fault has occurred.

The IEC 62271-200 standard describes the methods to be usedto carry out the tests and the criteria which the switchgear mustconform to, such as:- The doors of the switchgear must remain closed and there must

be no openings in the cover panels.- Any part of the switchgear which may be hazardous for personnel

must not be ejected.- No holes must appear in any part of the switchgear accessible

by personnel.- The vertically and horizontally arranged fabric indicators placed

outside the switchgear must not get burnt.- All the switchgear earthing connections must remain effective.

A metal enclosed switchgear that successfully fulfills these criteriaare designated as follows:- General: Internal Arc Classified (IAC AFLR)- Accessibility: Given as A, B or C, where (A) means the switchgear

is accessible to authorized personnel only, to all (B), not accessibledue to installation (C)

- Test values: Test current in kA, and duration in seconds

When installing the switchgear, some fundamental points must betaken into consideration, such as:- The level of the fault current (16...31.5 kA).- The duration of the fault (0.1...1s).- Escape routes for the hot and toxic gases given off by combustion

of materials.- Dimensions of the room, with special attention paid to the height.

The parameters of each specific plant mean that evacuation of thehot gases and burning particles must be carefully checked toensure and maintain personnel safety.

The UniGear switchgear is fitted with a complete range of solutionsto deal with all requirements when evacuation is possible insidethe room, but also when it is not compatible with the plantcharacteristics, as in the case of shipping installations.

UniGear 550 | Arc proof 09

Arc duration anddamage caused

Cables

Copper

Steel

kA2 s

0 100 200 500 ms

The UniGear 550 switchgear offers complete passive structuralprotection against the effects of a fault due to an internal arcfor a period of 1s up to 31.5 kA. ABB has also developedprotection systems which allow very important objectives to beachieved:

- The detection and repair of the fault in less than 100 ms.

- Minimal effects of the fault on the apparatus.

- Minimal down time.

For active protection against an internal arc, devices consistingof various types of sensors which detect faults immediately andcarry out selected opening of circuit breakers can be installedin the various compartments.

1 Arc with stand test

1

10 Arc proof | UniGear 550

Vacuum circuit-breakers

Vacuum circuit-breakers - VmaxVmax medium-voltage circuit breakers are used in electricaldistribution for the control and protection of cables, overheadlines, transformers and distribution substations, motors, trans-formers, generators and capacitor banks.

They are the synthesis of ABB vacuum interrupter technology,and excellence in breaker design, engineering and production.With specifications of up to 12 kV (rated voltage), 2,000 A (ratedcurrent) and 31.5 kA (internal arc withstand current), Vmaxbreakers are ideally suited to the narrow (550 mm) UniGear ZS1type switchgear panels.

Insulating MonoblocThe Vmax structure is particularly innovative in that it featuresa single insulating monobloc instead of three distinct separatepoles to house the three vacuum interrupters. The monoblocand mechanical operating mechanism, with a spring for controllingenergy storage, are fixed to a sturdy metallic frame. This compactstructure ensures the same sturdiness and mechanical reliabilityas a traditional circuit breaker consisting of an operating mech-anism/pole base cover and three separate poles. The low speedof the contacts together with the reduced run and mass container,limit the energy required for an operation, and therefore guaranteeextremely limited wear on the system. This means the circuitbreaker requires minimal maintenance.The Vmax medium-voltage circuit-breaker interrupters are thesame as those used in the VD4 and VM1 series, thereby ensuringthey all share the same characteristics, i.e. interruption of thecurrents without arc chopping and over-voltages, and extremelyrapid recovery of the dielectric properties after an interruption.

Operating MechanismThe Vmax series is fitted with an easy-to-use mechanical oper-ating mechanism, which is derived from the same mechanismthat equips the VD4 series.

The stored energy operating mechanism with free trip thereforeallows the opening and closing of operations independent ofthe operator. The spring system of the operating mechanismcan be recharged manually or by means of a geared motor. Theapparatus can be opened and closed using the pushbuttonslocated on the front of the operating mechanism, and by meansof the electric releases (shunt closing, shunt opening and under-voltage).

The circuit breaker is always fitted with a mechanical anti-pumping device to prevent repeated opening and closing followingsimultaneous and maintained opening and closing commands(local and/or remote).

TruckThe poles and operating mechanism are fixed onto a metalsupporting and handling truck. The truck is fitted with a set ofwheels, making the insertion and removal of the apparatus intothe switchgear panel possible with the door still closed.

The truck allows the circuit breaker to be properly earthed bymeans of the metallic structure of the switchgear.

Apparatus-Operator InterfaceThe circuit-breaker user interface is fitted with the followingparts:- Open button- Close button- An operation counter- Circuit-breaker Open/Closed indicator- Operating spring Charged/Discharged indicator- A manual spring operator- A selector for the exclusion of under-voltage release (optional)

UniGear 550 | Vacuum circuit-breakers 11

Standards

12 Standards | UniGear 550

Circuit-breaker Vmax/L 12 Vmax/L 17 Vmax/L 12

Standards GB 1984-2003 ■

IEC 62271-100 ■ ■ ■

CEI 17-1 (File 1375) ■ ■ ■

Rated voltage Ur [kV] 12 17.5 12

Rated insulation voltage Us [kV] 12 17.5 12

Withstand voltage at 50Hz Ud (1min) [kV] 28 38 42

Impulse withstand voltage Up [kV] 75 95 75

Rated frequency fr [Hz] 50-60 50-60 50-60

Rated normal current (40*) (2) lr [A] 630 1250 630 1250 2000

Rated breaking capacity Isc [kA] 16 16 16 16 16

(rated short-circuit 20 20 20 20 20

symmetrical current) 25 25 25 25

Ik [Ak] 31.5 31.5 31.5 31.5 31.5

Rated short-time (2) Ir [kV] 16 16 16 16 16

withstand current(3 s) 20 20 20 20 20

25 25 25 25

31.5 31.5 31.5 31.5 31.5

Making capacity Ip [kA] 40 40 40 40 40

50 50 50 50 50

63 63 63 63 63

80 80 80 80 80

Operation sequence [O-0.3s-CO-15s-CO] ■ ■ ■ ■ ■

Opening time [ms] 40...60 40...60 40...60 40...60 40...60

Acr time [ms] 10...15 10...15 10...15 10...15 10...15

Total interruption time [ms] 50...75 50...75 50...75 50...75 50...75

Closing time [ms] 60...80 60...80 60...80 60...80 60...80

IEC 62271-100 for circuit-breakers

Uses and Features

UniGear 550 units are designed to be used in conjunction withthe following instruments:- Ring core-type CTs (standard).- Block-type CTs (optional).- Bushing-type CTs (optional).- Ring-core type CTs

With the advent of new digital protection and measuringinstruments, the use of low-power measuring instruments canbe easily extended to primary distribution switchgear.

The CTs are fixed to a support, i.e. a CT rod, inside the switchgearwhich is positioned above the cable terminals. This ensures theCTs remain unaffected by the number of cables, cross sectionsor terminals used.

Each CT rod is designed to accommodate a maximum of twoCTs per phase (metering and protection) and it has the followingdimensional constraints:- A minimum internal diameter of 59 mm;- A maximum external diameter of 200 mm;- A maximum height of 100 mm.

Block-type CTsAs an alternative to the above specified current measuringinstruments, a dedicated combination of block-type currenttransformers, current sensors and combi-sensors can be used.

These are used in case of special requirements, such as fiscalmetering on incoming feeders (Class 0.2), differential protectionon line feeders, etc.

The use of block-type CTs will allow for the application of ringcore-type CTs on cables.

Bushing-type current transformersIn a large part of the market, especially among those who applyBS concepts, the bushing-type CT is very common.

Earthing switch ST1 -UGThe UniGear 550 panel is equipped with the patented earthingswitch type ST1-UG, which features a rectilinear movement.

The switch is fitted with a snap-action operation mechanism forpositive high-speed closing. It is dimensioned to conduct therated short-circuit current when closed under load conditions.The speed of the snap-action closing operation is independentof the controls.

The switch is equipped with an earthing blade which connectsthe three phases to the earthing pins located on the copperbars of the cable connecting system. The earthing bar iselectrically connected to ground by a standard copper conductor.

The closing mechanism of the earthing switch functionsindependently of the rotation of the drive shaft, and the switchingspeed and torque achieved are independent of the action of theoperating mechanism. During the opening process, however,the toggle springs have no effect on the speed of contactseparation.

A manual operating lever is provided to operate the switch.

The switch has been tested for two closing operations at 100%of the rated short-circuit current.

The device is provided with auxiliary switches, operated by therod mechanism, to indicate the status (open or closed) of theswitch.

Other components, such as a locking magnet, padlock, andkey locks for the open and closed positions are available onrequest.

1 2 31 Ring core-type CT | 2 Block-type CT | 3 Bushing-type CT | 4 Earthing switch ST1-UG

4

UniGear 550 | Uses and Features 13

Feeder protection

GeneralThe protection functions can be divided into two major groups:(1) Those that trip the circuit breaker of the faulted feeder if ashort circuit, or an earth fault, for example, occurs.(2) Protection functions that monitor the operation of the feederand the rest of the network. Voltage, frequency and overloadprotection functions (alarming/tripping) are typical monitoringfunctions.

The basic requirements of a protection system are adequatesensitivity and speed of operation, taking into account theminimum and maximum fault currents occurring in the intelligentelectronic device (IED) - such as the REF615 - locations, selec-tivity, monitoring inrush currents and the thermal and mechanicalstrength of the lines behind the relaying point. In many cases,the above requ i rements can be fu l f i l l ed w i th non-directional/directional current or multi-staged impedance mea-suring functions.

The purpose of an over- and under-voltage protection systemis to monitor the voltage level of the network. If the voltage leveldeviates from the target value by more than the permitted marginfor a specific period of time, the voltage protection system limitsthe duration of the fault and any resulting stress on the mech-anism.

To prevent major outages due to frequency disturbances, thesubstations are usually equipped with under-frequency protectionrelays, which in turn control various load-shedding schemes.

These are just a few examples of the main protection functionsfor feeders. More details can be found in the technical docu-mentation produced for ABB protection relays.

Applications and FeaturesDepending on the needs of the customer, a suitable IED typecan be selected and configured in a way that provides an overallsolution for different feeder types.

Generally, the required protection functionality of the feedertypes mentioned above differs greatly depending on the char-acteristics of the fault current sources and the types of advancedfunctions that may be needed to fulfill the basic requirementsof the protection application. A few examples will now be givento illustrate the requirement level.

Fig. 1: Comparison of Standard and High Requirement feeders

High requirement

Standard requirement

Feed

er ty

pe

Radialfeeders

Radial feederswith reclosers/sectionalizers

Feeders withdistrbutedgeneration

Parallel feeders

Ring main feeders

Infeed from bothends

Single function

Auto re-closure

Communication

Power qualitymonitoring

Fault locator

Single linediagram HMI*

Distanceprotection

*Human Machine lnterface

14 Feeder protection | UniGear 550

Recommended productsABB supplies a wide range of feeder protection relays andterminals to fulfill the requirements of each unique application.For an application with standard requirements and a need foradditional features, the REF 615, REX 521 units are excellentchoices. For applications with higher functionality requirements,the multifunction terminals REF 54_ should be selected.

Fig. 2 Typical standard feeder Fig. 3 Typical high requirement feeder

1) Optional

UniGear 550 | Feeder protection 15

Transformer protection

GeneralThe power transformer is an important component and one ofthe most valuable individual units in the power distributionnetwork. A highly reliable power transformer is therefore ofparticular importance in preventing disturbances in the powerdistribution system.

Although high-quality power transformers are highly reliable,faults including insulation breakdowns sometimes occur. Thesefaults, which appear as short circuits and/or earth faults generallycause severe damage to the windings and transformer core.The damage is proportional to the fault clearing time so thepower transformer must be disconnected as quickly as possible.The power transformer has to be transported to a workshopfor repair, which is a very time- consuming process.

The operation of a power network in which the power transformeris out of service is always cumbersome. Therefore, a powertransformer fault often constitutes a more severe power systemfault than a line fault, which usually can be rectified rather quickly.It is therefore extremely important that fast and reliable protectionrelays are used to detect transformer faults and initiate tripping.

The size, voltage level and importance of the power transformerdetermine the extent and choice of the monitoring and protectiondevices used to limit the damage of a possible fault. Whencompared to the total cost of the power transformer and thecosts caused by a power transformer fault, the cost of theprotection system is negligible.

Applications and FeaturesABB divides transformer applications into standard transformerprotection applications (typically <1 MVA) and high requirementtransformer applications (typically > 5 MVA).

Basic protection requirements (<1 MVA) include:- Sudden pressure (Buchholz) relay- Differential protection- Over-current protection- Earth fault protection- Overload protection- Unbalance protection- Oil level monitoring

High Requirements (>5MVA) are:- Sudden pressure (Buchholz) relay- Differential protection- Over-current protection- Restricted earth fault (REF) protection- Overload protection- Unbalance protection- Over/Under-voltage protection- Over/under-frequency protection- Oil-level monitoring

16 Transformer protection | UniGear 550

Motor protection

GeneralMotor protection generally provides over-current, unbalance,earth-fault and short-circuit protection. However, as well aselectrical faults, one of the worst threats facing motors isoverheating, which comes from improper operation. That is whythe fundamental issue for motors is thermal protection.

ABB's solutions focus on advanced thermal protection thatprevents the improper use of the motors. Thermal overloadprotection is needed to protect the motor against both short-and longtime overload and it is extremely important for theperformance of the motor. Short overload conditions mainlyoccur during motor start-up.

There are four crucial elements in thermal motor protection:(1) Most importantly, the thermal overload protection function

monitors the thermal load and records related events.(2) A cumulative start-up time counter supporting the overload

protection limits the number of consecutive cold starts.(3) Thermal stress during any single start-up condition is monitored

by the start-up supervision function, which protects themotor from becoming locked and extending start-up times.

(4) The fourth element is thermal protection based on ResistanceTemperature Detector (RTD) sensors. As RTD sensors directlymeasure the temperature of the stator winding, bearings,etc., this type of thermal protection is especially useful if themotor's cooling system is blocked.

Improper use of running motors does not necessarily break theequipment, but shortens its lifespan. Therefore, a reliable andversatile motor protection system not only protects the motorbut it also prolongs its life, which contributes to improving thereturn on investment of your motor drive.

Applications and FeaturesThanks to comprehensive communication protocols, includingthe widely used industrial protocols such as Modbus RTU/ASCIIand Profibus DP, ABB motor protection relays and terminals canbe easily integrated into various control systems.

UniGear 550 | Motor protection 17

Recommended productsThe RET 541/543/545 Transformer Terminals are designed forthe comprehensive protection, control, measurement andsupervision of two-winding power transformers and powergenerator transformer blocks in utility distribution networks. Itis suitable for applications where on-load tap-changer controlis required. The functionality for standard transformer protectionis provided in the REF542plus terminal.

Fig.4 Typical standard transformer protection Fig.5 Typical high requirement transformer protection

18 Motor protection | UniGear 550

Communication

UniGear 550 | Communication 19

GeneralIn the complex world of communication, ABB puts a great dealof effort into finding communication buses and protocols thatensure a secure and efficient data flow. In addition to the recentlyintroduced IEC 61850 protocol, ABB uses LON and SPA com-munication buses for communication between relays. In addition,protocols such as IEC 60 870-5-1 03, Modbus, Profibus andDNP 3.0 and OPC interface are available. Depending on theapplication area, different protocols are used according to industryde-facto standards.

Utility ApplicationsIEC 61850IEC 61850 is a flexible, future-proof standard that adapts tochanging requirements, philosophies and technologies. Thefunction of the IEC 61850 standard is to ensure essential features,such as interoperability between devices from different suppliers,the free allocation of functions, adaptability to ever-changingcommunication technology and ease of engineering and main-tenance.Because of the long-term stability of the IEC 61850 standard,investments in utilities are safeguarded.Since its inception, ABB has taken a leading position in theelaboration of corresponding standards in the field of substationautomation.

SPAThe SPA protocol is supported by all ABB relays and enablesa wide range of distribution automation functions. It is a provenserial bus that has formed the backbone communication protocolfor ABB relays for many years. The information content that canbe transferred is similar to that of the IEC 61850. To ensure EMIimmunity, the SPA protocol is run over a fiberoptic network.

LONThe LON protocol is a fast bus-based protocol featuring bothvertical (to a master system) and horizontal communication.When horizontal communication is used, IEDs are able toexchange interlocking information, for example, over the com-munication bus. This reduces the need for hard wiring betweendevices, thus saving costs.

The LON bus runs at a substantially higher speed than the serialbuses. ABB has defined extensions to the basic LON protocol,enabling any information appearing in distribution automationto be efficiently and securely transferred.To secure immunityagainst EMI disturbances, the LON bus runs over optical fibers.

IEC 60 870-5-103IEC 60 870-5-103 is a standard protocol designed exclusivelyfor communication between protection IEDs and a mastersystem. Allowing IEDs of different vendors to be connected toa common master system, it is widely supported within distri-bution automation. The range of information that can be trans-mitted with the IEC 60 870-5-103 protocol is smaller than theinformation range available through the LON, SPA and IEC61850 protocols.

DNP V3.0The DNP protocol, based on the IEC 60 870 standard family,was originally developed by a single vendor, but has now evolvedinto an open standard controlled by a user group. It is designedfor local communication within a substation, between a protectionIED and an RTU (which forwards information to a remote SCADAsystem). Additionally, protection IEDs can be connected directlyto a remote system using this protocol. The DNP has a multitudeof options enabling it to be optimized for different types ofapplications and communication environments (it can, forinstance, be optimized to run over a slow communication link).

Industrial Applications

Profibus DP V1Profibus is a major de-facto standard for connectivity to industrialsystems. All ABB relays can be connected to Profibus mastersystems using the SPA-ZC 302

SPA/Profibus converter. The SPA-ZC 302 supports the ProfibusDP V1 protocol and can handle up to 16 SPA devices. Thespeed of the Profibus is comparable to that of LON and it issubstantially higher than the speed of serial protocols. To ensureEMI immunity, Profibus runs over a double-shielded twisted paircable. Profibus is generally used when protected IED informationis to be transmitted to a controller or PLC.

ModbusThe Modbus protocol was first introduced by Modicon Inc. andis a widely accepted communication standard for industrialcontrollers and PLCs. It is a serial protocol designed for thetransfer of binary and numeric data in a generic format. TheModbus as such does not recognize the data model of a distri-bution automation application (as. the IEC 61850 does). Modelingis done in the application of the Modbus master system. Modbustypically uses a twisted pair RS-485 bus network as a transmis-sion medium.

OPCOPC is commonly used to interconnect systems in industrialautomation applications. A data exchange system using OPCconsists of an OPC Server (which provides data and services)and an OPC Client (which receives data from and uses theservices of the OPC server). The OPC server and the OPC clientare both software components running on PCs. The interactionbetween an OPC Server and an OPC Client can take place eitherlocally in one PC or over a LAN/WAN computer network (in thelatter case using DCOM as the intermediate protocol). Data fromprotection IEDs can be made available in different ways throughan OPC interface. One option is to use the SPA/ OPC orLON/OPC servers, which collect data from protection IEDs usingLON or SPA and make the data available in the OPC environment.Another option is to connect the protection IEDs to the COM610 gateway. Any data in the COM 610 can be made availableto an OPC client.

OPC is usually used when the data from protection IEDs is tobe transmitted directly to a control system (as opposed toProfibus and Modbus that usually supply data to a controlleror a PLC). Via PC or over a LAN/WAN computer network (in thelatter case using DCOM as the intermediate protocol), data fromprotection IEDs can be made available in different ways throughan OPC interface. One option is to use the SPA/OPC or LON/OPCservers, which collect data from protection IEDs using LON orSPA and make the data available within the OPC environment.Another option is to connect the protection IEDs directly to theCOM 610, thereby making data available to an OPC client. OPCis usually used when the data from protection IEDs is to betransmitted directly to a control system (as opposed to Profibusand Modbus that usually supply data to a controller or a PLC).

20 Industrial Applications | UniGear 550

Arc protection

GeneralAn electric arc short-circuit in a switchgear installation is normallycaused by a foreign object entering the cubicle or by a componentfailure. The arc causes explosion-like heat and pressure thatcan extensively damage the switchgear and the operatingpersonnel.

An adequate arc protection system protects a substation againstarc faults by minimizing the burning time of the arc, thus pre-venting excessive heat and damage. It minimizes material damageand allows power distribution to be smoothly and safely restored.The system can also bring cost benefits even before an arc faultoccurs. As older switchgear is more prone to arc faults, an arcprotection system will effectively extend the life of your switchgearand make more of your investment.

But more importantly, arc-protection technology can help savelives.

Applications and FeaturesSources of arcing may be insulation faults, the incorrect operationof devices, defective bus or cable joints, over-voltage, corrosion,pollution, moisture, ferroresonance (in instrument transformers)and even ageing due to electrical stress. Most of these arc-faultsources could be prevented by sufficient maintenance. However,in spite of the precautions taken, human errors can lead to arcfaults.

Time is critical when it comes to detecting and minimizing theeffects of an electric arc. An arc fault lasting 500 ms may severely

damage the installation. If the burning time of the arc is lessthan 100 ms the damage is often limited, but if the arc isextinguished in less than 35 ms, the effect goes almost unnoticed.

Generally applied protection relays are not fast enough to ensuresafe fault clearance times when arc faults occur. The operationtime of the over-current relay controlling the incoming circuitbreaker may, for instance, have to be delayed by hundreds ofmilliseconds for selectivity reasons. This delay can be avoidedby installing an arc-protection system.

The total fault clearance time can be reduced to a maximumof 2.5 ms, plus the circuit breaker's contact travel time. Further-more, in cases of cable compartment faults, auto-reclosurescan be eliminated by employing arc protection.

Recommended productsThe arc protection system, REA 101, with its extension units,REA 103, REA 105 and REA 107, are designed to be used forthe protection of medium and low-voltage air-insulated switchgear.The central unit type REA 101 can operate independently ortogether with other REA 101 units.

With tripping times as low as 2.5 ms, REA is the fastest arcprotection system on the market.

REA is equipped with a fast integrated over-current sensingelement and it works independently of other feeder protectionunits. The REF 610 feeder protection relay includes an optionalarc protection function for the feeder cubicle.

Fig. 8 Typical setup with REA 101 and REA 103 subunits

UniGear 550 | Arc protection 21

3

Trip

Trip

REA 101

REA 103 REA 103

Light

Selection guide

Application REF 615 REX 521 REF 54_ RET 54_ REM 54_ REM 610 REA 10_Feeder application ■ ■

High requirement feeder application ■ ■

Transformer application ■ ■

High requirement transformer application ■

Motor protection ■ ■ ■ ■

High requirement motor application ■

Generator & synchronous motor ■

Distance protection ■

Arc protection for feeder cubicle ■ ■

Arc protection system

Communication

IEC 60870-5-103 ■ ■ ■ ■ ■

IEC 61850 ■* ■* ■* ■* ■* ■*

DNP 3.0 ■ ■ ■ ■

SPA ■ ■ ■ ■ ■ ■

LON ■ ■* ■ ■ ■ ■*

Modbus ■ ■ ■ ■ ■

Profibus ■ * ■* ■* ■* ■* ■*

Additional functions

Fault locator ■

Web interface ■

CAN interface ■

On load tap chemger control ■

Disturbance recording ■ ■ ■ ■ ■ ■

Withdrawable release mechanics ■ ■

Condition monitoring ■ ■ ■ ■ ■

Single line diagram HMI** ■ ■ ■

Remote control ■ ■ ■ ■

Power quality monitoring ■ ■

Sensor inputs ■ ■ ■ ■

Auto re-closure 5 shots 3 shots 5 shots

RTD*** inputs 8 8 6

* With interface adapter** HMI - Human Machine Interface***RTD - Resistive Temperature Detector

22 Selection guide | UniGear 550

REF542plus multifunction protectionand control unit

The REF542plus unit integrates all the secondary functionsrelevant to a switchgear unit in a single module fitted with awatchdog.

Thanks to the flexibility of its software, the unit is able to satisfya vast range of installation requirements. The high level offunctionality of the REF542plus unit is supported by a simpleand easy-to-use user interface.

With a REF542plus unit, each medium-voltage UniGear panelbecomes an integrated and independent unit able to carry outfunctions such as protection, measurement, control, signaling,interlocking, automation and communication.

The REF542plus is characterized by

- A single interface between the switchgear and operator forthe installation panels: feeder, transformer, motor,generator,power correction banks, bus-tie and measurements units.

- Single type of spares parts and accessories: a single hardwareunit.

- Low maintenance. Good preventive maintenance severelylimits the faults caused by tampering and errors.

- The functions can be easily modified and upgraded, evenwhen the switchgear is in service, by means of unit configurationsoftware switchgear.

HardwareThe device central unit is housed inside the auxiliary compartmentof the switchgear while the user interface is located on the doorof this compartment.

The two pieces are connected together by means of a simplecommunication cable. The user interface can be replaced whilethe central unit remains in service and all the measurement,control and protection functions are guaranteed duringmaintenance work.

All the connections are made by means of plug socket connec-tors to optimize service and maintenance operations.

Machine-user interfaceThe UniGear switchgear is easily operated via the user interfaceof the REF542plus unit.

All the apparatus control operations, measurement readouts,detection of signals and parameterization of functions can becarried out directly from the front of the unit, or by means of alaptop computer connected to the optic communication gatelocated on the front.

Central unitThe REF542plus central unit consists of several electronicmodules:

- Feeder. The apparatus is fitted with a multi-voltage internalfeeder and can operate from 48 to 220 Vdc. Thanks to itsdigital technology, consumption is very low.

- Digital inputs. Each unit is fitted with a minimum of 14 digitalinputs to interface with the apparatus - circuit-breaker andearthing switch - contained in the switchgear. These can beincreased to a maximum of 42. They operate between 20 and250 Vdc. and are freely programmable.

- Digital outputs. These consist of free contacts made availableby bi-stable relays. Each unit has at least 8 outputs to operatethe switchgear apparatus and the minimum signals required.The number of outputs can be increased to a maximum of 24.They operate up to 250 Vdc/ac. and are freely programmable.

The output that controls circuit-breaker opening can also carryout control of circuit continuity.

By means of the static outputs with which it is fitted (from 1to a maximum of 3), it is possible to interface conventionalsupervision systems by means of active and reactive powermeasurements with impulse emitter.

- Analogue inputs. Each unit is fitted with 8 analogue inputsneeded to carry out measurements and protections.

Signals coming from conventional CTs (1 and 5 A) and VTs(100 and 110 V) or from measurement sensors (based on aRogowski coil and resistive divider) can be acquired.

- Analogue outputs. The 4 analogue outputs the unit can beprovided with make it possible to interface conventional super-vision systems by means of the integrated measurementfunctions. Each output can be freely programmed as 0...20mAor 4...20mA.

UniGear 550 | REF542plus multifunction protection and control unit 23

CommunicationThe REF542plus unit can be connected to supervision and processsystems by means of an integrated communication function.

This turns the apparatus into a window through which the systemaccesses all the switchgear information and makes the followingfunctions possible:- Monitoring- Control- Parameterization of the protection functions ? Measurements- Measurements- Monitoring of all operating apparatus- Disturbance oscillography

The following protocols are available for connection to thesupervision and automation systems:- ABB SPA-bus- LON-bus in accordance with ABB Lon Application Guide (LAG

1.4);

- IEC 60870-5-1 03 (in accordance with VDEW specifications);- MODBUS RTU.

Use of the LON-bus protocol and relative LIB542 library allowsthe REF542plus unit to be integrated into ABB supervision systems.

Using the hardware configuration with two gates and the MODBUSRTU protocol, it is possible to create redundant systemarchitectures, or independent connections to two different systems,for example, a supervisory control and data acquisition system(SCADA) and a process distributed control system (DCS).

SynchronizationThe REF542plus unit can be connected to an external master clock(typically a GPS) by means of a dedicated optic input forsynchronization. When synchronized using this method, theREF542plus units guarantee chronological recording of events withina maximum time of 1 ms. The protocol accepted is IRIG-B.

24 REF542plus multifunction protection and control unit | UniGear 550

Automatic transfer systems

Automatic transfer systems (ATS) are used to give maximumservice continuity by ensuring an uninterrupted supply of power.This is possible using various systems based on different kindsof techniques.

The most common systems are described below with relevantaverage transfer times of.The first two systems on the list above are the simplest and canbe made with conventional logics and instruments. Theyguarantee average transfer times and can therefore be used ininstallations where voltage gaps are not particularly critical.

On the other hand, the other two systems,

- Delayed: 1500 ms- Depending on the residual voltage: 400-1200 ms- Synchronised (ATS): 200-500 ms - High speed (HSTS): 30-120 ms

Synchronized ATS and a High Speed Transfer System (HSTS)require a microprocessor-based apparatus with high technologicalcontent. They guarantee fast transfer times and are generallyapplied in plants where the process times are particularly critical.Slower transfers times would cause serious malfunctions oreven stoppages.

ABB is able to offer all the transfer systems, from the simplestto the most complex.

The REF542plus unit can be used in medium-voltage switchgearto manage automatic and manual transfer between two differentincoming feeders.

The time needed for automatic transfer using the REF542plusunit is between 200 and 300 ms (including the circuit- breakeroperating times). This time can vary depending on the complexityof the software transfer logics. Switchgear equipped with suitablyprogrammed REF542plus units are considered complete andefficient systems able to manage transfer between one powersupply system and an alternative one or reconfigure the network,passing from double radial distribution to a simple system, ina fully automatic way.

It is also possible to carry out the same operation manually froma remote control station, or from the front of the switchgearunder the supervision of user personnel. Manual transfer firstinvolves paralleling two parts of the power system. By meansof the synchronism control function “synchro-check” (ANSIprotection code 25) implemented from the REF542plus, thepower supply lines are closed simultaneously as the voltagevectors become synchronized before being disconnected whenthe transfer has taken place. The applications described do not

Single-line diagram of UniGear switchgear with REF542plus architecture. This configuration is suitable for carrying out automatic and manual transfer (ATS),as well as switchgear protections and measurements.

UniGear 550 | Automatic transfer systems 25

Altemative solutions

Typical units and technical data

Single-line diagram of the typical unitsW

ithdr

awab

le

With

draw

able

With

draw

able

With

draw

able

With

draw

able

1 2 3 4

5 6 7

1 IF - Incoming / Outgoing feeder | 2 BT - Bus Tie | 3 R - Bus Riser | 4 RM - Bus Riser with measurements5 M - Measurements | 6 IFD - Direct Incoming / Outgoing | 7 IFDM - Direct Incoming / Outgoing with measurement

26 Typical units and technical data | UniGear 550

UniGear 550 | Typical units and technical data 27

Single-line diagram of the busbar applications1 Current transformers | 2 Voltage transformers | 3 Duct entry | 4 Earthing switch

Graphical symbols1 Circuit-breaker | 2 Contactor | 3 Switch | 4 Isolating bar | 5 Socket and plug | 6 Voltage transformers | 7 Current transformers | 8 Fuse | 9 Earth10 Cable entry | 11 Busbar entry

IF

FM

BT

R

RM

M

IFD

IFDM

DF

...31.5kADepth(mm)

Rated current (A)

Incoming / outgoing

Incoming / outgoing with Measurements

Bus-tie

Riser

Riser with measurements

Measurements

Direct incoming / outgoing

Direct incoming / outgoing with measurement

Switch-disconnector unit

550

630 1250 1600 2000

Technical data

Altemative solutions

1 2 3 4

1 2 3 4 5

6 7 8 9 10 11

Width Depth

Height

Height with gas exaust duct

-Width: 550mm-Depth: 630~1,250A :1,340mm 1,600~2,000A :1,390mm Deeper:1,650mm-Height: 2,200mm-Height with gas exhaust duct: 2,675mm

Unit Compartments

A: ApparatusB: Main busbarsC: Feeder

D: Instruments

E: Gas exhaust duct

E

A

C

BD

28 Typical units and technical data | UniGear 550

Ring CT

Din CT

Ring CT

Din CT

Incoming / outgoing - Bottom cables

630~2000

1

4

2

According to order request

I.F

630~2000

1

4

2

1


I.F

630~2000

1

4

2

1

1 Set


I.F

630~2000

1

4

2

2

1


I.F

630~2000

1

4

2

2

3

1


I.F

Depth: 1650mm

Rated current (A)

Circuit breaker Vmax

Current transformer

Voltage transformers

Fuse

Earthing switch ST1-UG

Arrester

Voltage display devices

Prim

ary

com

pone

nt

Purpose

Remarks

Item 001 002 003 004 005

Cubicle type

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 006 007 008 009 010

Cubicle type

Memo: Only one type of Ring CT or Din CT could be used in one panel.

630~2000

1

4

2

3

1


I.F

630~2000

1

4

2

3

3

1


I.F

Depth: 1650mm

630~2000

1

6

3


I.F

630~2000

1

6

3

1


I.F

630~2000

1

6

3

1

1 Set


I.F

Main Connection Example

UniGear 550│Main Connection Example 29

Ring CT

Din CT

Ring CT

Din CT

630~2000

1

6

3

2

1


I.F

630~2000

1

6

3

2

3

1


I.F

Depth: 1650mm

630~2000

1

6

3

3

1


I.F

630~2000

1

6

3

3

3

1


I.F

Depth: 1650mm

630~2000

1

4

2

1 Set


I.F

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 011 012 013 014 015

Cubicle type

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 016 017 018 019 020

Cubicle type


630~2000

1

6

3

1 Set


I.F

630~2000

1

6

3

2

3

1

1 Set


I.F

Depth: 1650mm

630~2000

1

6

3

3

3

1

1 Set


I.F

Depth: 1650mm

630~2000

1

4

2

2

3

1

1 Set


I.F

Depth:1650mm

630~2000

1

4

2

3

3

1

1 Set


I.F

Depth: 1650mm

30 Main Connection Example | UniGear 550

Ring CT

Din CT

Ring CT

Din CT

630~2000

1

4

2


I.F

630~2000

1

4

2

1


I.F

630~2000

1

4

2

1

1 Set


I.F

630~2000

1

4

2

3

3

1

1 Set


I.F

630~2000

1

4

2

2

3

1

1 Set


I.F

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 021A 022A 023A 024A 025A

Cubicle type

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 026A 027A 028A 029A 030A

Cubicle type


630~1250

1

6

3


I.F

630~1250

1

6

3

1


I.F

630~1250

1

6

3

1

1 Set


I.F

630~2000

1

6

3

3

3

1

1 Set


I.F

630~2000

1

6

3

2

3

1

1 Set


I.F

Incoming / outgoing - Top cables entry (Depth: 1650mm)

UniGear 550│Main Connection Example 31

Ring CT

Din CT

Ring CT

Din CT


630~2000

1

4

2

1 Set


I.F

630~2000

1

6

3

1 Set


I.F

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 031A 032A 033A 034A 035A

Cubicle type

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 036A 037A 038A 039A 040A

Cubicle type


Ring CT

Din CT

Ring CT

Din CT

630~2000

1

4

2


I.F

630~2000

1

4

2

1


I.F

630~2000

1

4

2

1

1 Set


I.F

630~2000

1

4

2

3

3

1

1 Set


I.F

630~2000

1

4

2

2

3

1

1 Set


I.F

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 021B 022B 023B 024B 025B

Cubicle type

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 026B 027B 028B 029B 030B

Cubicle type


630~1250

1

6

3


I.F

630~1250

1

6

3

1


I.F

630~1250

1

6

3

1

1 Set


I.F

630~2000

1

6

3

3

3

1

1 Set


I.F

630~2000

1

6

3

2

3

1

1 Set


I.F

Incoming / outgoing - Top busbar entry (Depth: 1650mm)

UniGear 550 | Main Connection Example 33

Ring CT

Din CT

Ring CT

Din CT


630~2000

1

4

2

1 Set


I.F

630~2000

1

6

3

1 Set


I.F

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 031B 032B 033B 034B 035B

Cubicle type

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 036B 037B 038B 039B 040B

Cubicle type


Ring CT

Din CT

Ring CT

Din CT


630~2000

1

4

2

BT

630~2000

1

4

2

1

BT

630~1250

1

4

2

1 Set

BT

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 051 052 053 054 055

Cubicle type

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 056 057 058 059 060

Cubicle type


630~2000

1

6

3

BT

630~2000

1

6

3

1

BT

630~1250

1

6

3

1 Set

BT

Bus-tie


630~1250

2

2

3

M

630~1250

2

2

3

M

630~2000

2

2

3

M

630~2000

2

2

3

M

Rated current (A)


Current transformer Din CT


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 061 062 063 064 065

Cubicle type

Measurement

Rated current (A)


Current transformer Din CT


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 066 067 068 069 070

Cubicle type

630~2000

2

2

3

M


2

3

P

3

3

P

2

3

1 Set

P

3

3

1 Set

P

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 081 082 083 084 085

Cubicle type

Measurement (VTs)

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 086 087 088 089 090

Cubicle type

630~1250

2

3

1 Set

P+(I)

630~1250

3

3

1 Set

P+(I)

630~1250

2

3

1 Set

P+R

630~2000

2

3

P+R

630~2000

3

3

P+R


630~1250

2

3

1 Set

P+R

630~1250

3

3

1 Set

P+R

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 091 092 093 094 095

Cubicle type

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 096 097 098 099 100

Cubicle type

Bus-riser

630~1250

R

630~1250

1 Set

R

Rated current (A)


Current transformer


Fuse


Arrester


Prim

ary

com

pone

nt

Purpose

Remarks

Item 101 102 103 104 105

Cubicle type


Documents

Product Instruction UniGear 550 Medium voltage, arc-proof, air … · 2018-12-13 · REF542plus multifunction protection and control unit 23 Hardware 23 Machine-user interface 23