Power Transmission and Distribution

Differential Protection 7UT6

Presentation

PTD PA 7UT6 Present 11/04 No. 2

The 7UT6 Family

7UT612: for two end protection objects (1/3 x 19’’ housing 7XP20)7UT613: for three end protection objects (1/2 x 19’’ housing 7XP20) 7UT633: for three end protection objects (1/1 x 19’’ housing 7XP20)7UT635: for five end protection objects (1/1 x 19’’ housing 7XP20)

SIPROTEC 47UT6 differential protection relay for transformers,generators, motors and busbars

PTD PA 7UT6 Present 11/04 No. 3

Hardware options

7UT612

7 (7)*1---34 14 lines

7UT613

11 (6)*1**3 / 15 814 lines

7UT633

11 (6)*1**3 / 121 241Graphic

Device

Current Inputs (normal)

Current Inputs (sensitive)

Voltage Inputs (Uph / UE)

Binary InputsBinary OutputsLife contact LC Display

7UT635

14 (12)* 2**---29 241 Graphic

* 1A, 5A, (1A, 5A, 0.1A) changeable (jumper position)

** changeable normal or sensitive (jumper position)

PTD PA 7UT6 Present 11/04 No. 4

Scope of functions and Protection objects

Function ANSI No.

Differential 87T/G/M/L

Restricted Earth fault 87 N

Overcurrent-time, phases 50/51

Overcurrent-time, 3I0 50N/51N

Overcurrent-time, earth 50G/51G

Overcurrent-time, single phase

Negative sequence 46

Overload IEC 60255-8 49

Overload IEC 60354 (hot spot) 49

Overexcitation V/Hz 24

Breaker failure 50BF

External temperature monitoring 38

Lockout 86

Measured value supervision

Trip circuit supervision 74TC

Direct coupling

Operational measured values

Protection Objects

Three-phase transformer

Single-phase transformer

Auto-transformer

Generator / Motor

Busbar, 3-phase (Branch point)

Busbar, 1-phase

PTD PA 7UT6 Present 11/04 No. 5

Cross reference - functions and protected objects

XXXXXXOperational measured values

XXXXXXDirect coupling 2

XXXXXXDirect coupling 1

XXXXXX74TCTrip circuit supervision

XXXXXXMeasured value supervision

XXXXXX86Lockout

XXXXXX38External temperature monitoring(thermo-box)

---XXXXX50 BFBreaker failure

XXXXXX24Overexcitation V/Hz *)

---XXXXX49Overload IEC 60354

---XXXXX49Overload IEC 60255-8

---XXX---X46Negative sequence

XXXXXXOvercurrent-time, single phase

XXXXXX50G/51GOvercurrent-time, earth

---XXX---X50N/51NOvercurrent-time, 3I0

---XXXXX50/51Overcurrent-time, phases

------X---XX87 NRestricted Earth Fault

XXXXXX87T/G/M/LDifferential

Busbar1-phase

Busbar3-phase

Gen. /Motor

Auto-transf.

Transf.1-phase

Transf.3-phase

ANSI No.Protection functions

X Function applicable ; --- Function not applicable ; *) only 7UT613 / 633

PTD PA 7UT6 Present 11/04 No. 6

Communication features

Front interfaceDIGSI4

WEB Monitor

Service interface (s)DIGSI4 operation

modem connection

RTD box

Flexibility due to plug in modulesCompatibility to international standards

System interfaceIEC60870-5-103

Profibus FMS

Profibus DP

DNP3.0

Modbus ASCII/RTU

Time synchronisingIRIG-B (GPS)

DCF77

RS232/RS485 electrical module

Fibre-optic module

Optical double-ring module

PTD PA 7UT6 Present 11/04 No. 7

Connection Example

direct connection to themain Ct’s

no matching transformers /no matching connections

numerical vector groupadaptation without zero sequence current correctiondepending of the type ofearthing of the winding.

increased sensitivity by 33%by measuring of the zerosequence current (7UT6) forsingle-pole faults.

1A/5A main Ct’s adaptationin the relay

permissible ratio Ct nominalcurrent to transformer nominalcurrent up to 1 : 4

IL2M1

IL1M3

IL2M2

IL3M2

IL2M3

IL3M1

IL3M3

IL1M2 IL1M1IX1 IX3

7UT613

M1

M3

M2 side 1side 2

side 3

Surfacemountinghousing

Flush/cubicle-mountinghousing

L1

L2

L3

L1

L2

L3

L1

L2

L3

PTD PA 7UT6 Present 11/04 No. 8

Commissioning and operating aids (1 of 4)

WEB-Technology

The homepage of the relayis:http://141.141.255.160IP-address is set with DIGSI 4on front- or rear service port

WEB server in the relays firmware

Server sends it’s HTML-pages and JAVA-code to the WEB Monitorafter a DIAL-UP connection

2. HTML page view in a WEB Monitorwith the IP-address of the relayhttp://141.141.255.160

Help system in INTRANET / INTERNEThttp://www.siprotec.com

1. Serial connectionDirect or via modem with a standard DIAL-UP Network

Access to the relay with a WEB Monitor

PTD PA 7UT6 Present 11/04 No. 9

Commissioning and operating aids (2 of 4)

Transformer YNd11d11, 110/11/11kV, 38.1MVA, IL2S2? wrong polarity

PTD PA 7UT6 Present 11/04 No. 10

Commissioning and operating aids (3 of 4)

Transformer YNd11d11, 110/11/11kV, 38.1MVA, IL2S2? wrong polarity

PTD PA 7UT6 Present 11/04 No. 11

Commissioning and operating aids (4 of 4)

PTD PA 7UT6 Present 11/04 No. 12

Protection relay with flexible adaptation to the transformer/generator/motoror short line. Programming of the device data in the relay.

Reduced amount of wiring by direct connection to the main Ct’s.No matching transformers and therefore no wiring errors.

Zero sequence current can be measured (in the 7UT6).Sensitivity for single-pole faults in the transformer increased by 33% .

Flexible adaptation of the tripping characteristic to various main Ct’s, tapped transformers.

Exact discrimination between the short circuit condition and the inrushcondition by on-line analysis of the harmonics. Fast tripping for high-current faults. Ct saturation detector for external faults.

Thermal monitoring of one transformer winding (including RTD meas.)

Back-up DMTL/IDMTL with reverse blocking for one winding.

Sensitive short circuit protection for faults winding against earth.

External Trip functions

Various commissioning aids.

Common DIGSI 4 software

Benefits for the Customer

PTD PA 7UT6 Present 11/04 No. 13

Comparison of functions/settingsbetween 7UT51- and 7UT6 relays

3030303080Transformer inrush: Default setting for 5. harmonic [%]

XXXX---All functions can be enabled at the same time

33330Transformer inrush: Default setting for cross block 2. harmonic [cycles]

XXXX---High impedance Restricted Earth Fault

---XX------Over excitation protection [V/Hz]

---XX------Voltage measurements

XXXX---Single phase busbar differential

XXXX---Temperature monitoring (via Thermo-box / RS 485)

XXXX---Negative sequence current protection

XXXX---Overload protection IEC 60354 (hot spot)

XXXX---WEB monitor (commissioning aid)

XXX------Tripping Characteristic: Increasing of characteristic due to DC offset in IDiff

1111½Tripping Characteristic: slope of add-on stabilization / slope 1

XXX------Tripping Characteristic: cross block for add-on stabilization

22225Tripping Characteristic: minimum setting for add-on stabilization I/InO

XXXX---Tripping Characteristic: Increasing of characteristic at start

XXXX---Tripping Characteristic: Base point for slope 1 settable

7UT635

7UT633

7UT613

7UT612

7UT51