BE1-51TC

APPLICATIONPage 2

SPECIFICATIONSPage 3

EXTERNALCONNECTIONS

Page 8

ORDERINGINFORMATION

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The BE1 -51TC Time Overcurrent Relay with Torque Control providesthe function of a torque controlled relay, but replaces the electro-mechanical induction disc with a microprocessor for a new standard intiming and control versatility.

FEATURES• One relay can simultaneously monitor three phases plus neutral

currents.

• All typical characteristic curves, including inverse, definite timedelays and BS142 functions are available.

• Isolated or non-isolated contact sensing available.

• Characteristics may be field selectable with optional switch.

• BIT (Built-in-test) simplifies calibration and provides a quick opera-tional check to confirm the integrity of outputs, LEDs, and targets.

• Pickup repeatability ±2%.

• Timing repeatability ±5%.

• Qualified to IEEE C37.90a-1974 Surge Withstand Capability Test.

• Five year warranty.

ADDITIONAL INFORMATIONINSTRUCTION MANUAL

Request Publication 9201200990

STANDARDS, DIMENSIONS & ACCESSORIESRequest Bulletin SDA

BE1-51TCTIME OVERCURRENT

RELAY WITHTORQUE CONTROL

UDP-21-88

BOX 269 ROUTE 143 HIGHLAND, ILLINOIS 62249, U.S.A. PHONE 618-654-2341 FAX 618-654-2351

BE1-51TC

APPLICATIONTIME OVERCURRENT RELAYSTime overcurrent relays provide phase and groundfault protection for distribution circuits, generators,transformers, and other major components of thepower system. The relays need to be capable of a widerange of pickup settings and characteristics in order tocoordinate properly with other protective devices in thepower system.

The BE1-51TC Time Overcurrent Relay with TorqueControl provides single or multiple phase currentsensing within a single unit. The relay features a pickupsetting range of 0.5 to 12 amperes and a variety oftiming characteristics for proper coordination. Anoptional selector switch may be included to allowselection of the desired timing curve when the relay isinstalled or set.

TORQUE CONTROLIt is often desirable to enable/disable a time overcurrentrelay according to other system conditions. This isaccomplished by inhibiting the operation of the timeovercurrent relay until another protective relay (such asa voltage, directional, or distance relay) closes itsoutput contact, thereby enabling the time overcurrentrelay.

The term “torque-controlled” comes from the way thiswas accomplished for electromechanical induction discrelays and serves as a functional description of asimilar operation by a solid-state relay. The timeovercurrent characteristics of the BE1-51TC are unaf-

fected by the torque control function. The relay beginstiming if the torque control contact is closed and thesensed current exceeds pickup. Reset occurs immedi-ately if the contact opens.

The instantaneous overcurrent function is not torquecontrolled, and neutral sensing is not torque con-trolled.

The BE1-51TC adds a new dimension by providing theoption of non-isolated contact sensing which elimi-nates the need for dedicated contacts to control theoperation of this device. The BE1-51TC is also avail-able with isolated dry contact sensing inputs.

The sixteen standard overcurrent timing functions inthe time overcurrent relay provide a means to coordi-nate with other protective devices, Table 1 illustratestypical applications for the standard time overcurrentcharacteristic curves, An additional set of 16 timingcharacteristics is available for extended timing require-ments. These extended time characteristics are similarto the standard curves except multiplied by a constanttiming factor of 5.688.

INSTANTANEOUSOVERCURRENT MONITORINGAn instantaneous output, individually adjustable forcurrent level, may be specified as an aid in coordinat-ing a relay scheme. (For single-phase styles, a secondindependent instantaneous function may be specified.)

Table 1 - Application Summary

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BE1-51TC

SPECIFICATIONSFUNCTIONAL DESCRIPTIONThe specifications on these pages define the manyfeatures and options that can be combined to exactlysatisfy an application requirement. A block diagram(page 4) is included to show how various standardfeatures, as well as some of the options, relate toeach other.

INPUTSCurrent Sensing In most models, two ranges are provided (HIGH/LOW), each with its own pair of input terminals. Note:Units with three-phase-and-neutral sensing do notemploy dual range current sensing inputs. Thecurrent sensing input capabilities and burden areshown in Table 2.

Table 2 - Sensing Burdens

Contact Sensing InputsEach phase of the relay is enabled by an externalcontact. (The neutral and instantaneous functions are

enabled at all times.) This contact must have aminimum rating of 0.05 A at 250 Vdc. Depending onthe selected option, the current through the contactsmay be obtained from the relay itself (isolated contactsensing), or from a dc source with a voltage ratingcompatible to the relay’s power supply input range(non-isolated contact sensing).

Power Supply InputsOne of four power supply types may be selected toprovide internal operating power. These are describedin Table 3.

Table 3 - Power Supply Options

Type J K L Z*

Nominal 125 Vdc 48 Vdc 24 Vdc 250 Vdc Voltage 120 Vac 230 Vac

Burden 14w 12W 10W 25w25VA 60 VA

All ac references are 50/60 Hz.*External modules required for contact sensing when type Zpower supply is specified.

OUTPUTSTime overcurrent output contacts, as well as auxiliaryand optional instantaneous output contacts, are ratedas follows:

Resistive120/240 Vac- make 30 A for 0.2 seconds, carry 7 A

continuously, break 7 A.

250/240 Vdc - make and carry 30 A for 0.2 seconds,carry 7 A continuously, break 0.1 A.

500 Vdc - make and carry 15 A for 0.2 seconds, carry7 A continuously, break 0.1 A.

Inductive120/200 Vat. 125 Vat, 250 Vdc - break 0.1 A (L/R =

0.04).

PANEL CONTROLS AND INDICATORSTap SelectorSelection of the time overcurrent pickup point isfacilitated by a lo-position selector. This, together withthe TAP CAL control described below, allows conve-nient and precise settings for all phase elementssimultaneously. A similar set of controls indepen-dently adjusts neutral pickup (if neutral element isspecified).

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BE1-51TC

SPECIFICATIONS, continued

TAP CAL ControlThis control adjusts the time overcurrent pickup pointbetween the TAP selector settings. When the TAPCAL control is fully CW, the actual pickup point willbe within ±5% of the indicated TAP selector setting.

Time Overcurrent Pickup ±2% of pickupMeasuring Accuracy setting

Time Overcurrent Pickup Better than 95% ofDropout Ratio pickup level.

Figure 1 - Functional Block Diagram

Time DialThis pair of thumbwheel selectors determines the timedelay between the sensing of a phase overcurrentcondition and the closing of the output contacts. Thetime delay may thus be selected over the range of 00to 99, as shown on the Characteristic Curves (Figures3 through 16). For relays with extended timing range,the actual time delay will be approximately 5.7 timesthe value shown in the curves.

Time Delay Accuracy ±5% of the characteristiccurve value.

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BE1-51TC

SPECIFICATIONS, continuedTiming IndicatorA light emitting diode (LED) indicates when the sensedcurrent exceeds the time overcurrent pickup setting -assuming that the overcurrent condition occurs on anenabled phase.

Power IndicatorA front panel LED illuminates to indicate that the powersupply is providing the internal operating voltages.

Target IndicatorsTargets may be specified to indicate which phase (orneutral) initiated the overcurrent condition, and whichfunction was instrumental in causing an output (i.e.,TIME, INST 1, or INST 2). Either current operated orinternally operated targets may be selected for thefunction targets. The element targets (i.e., the phaseand neutral indicators) are always internally operated.

A current operated target requires a minimum currentof 0.2 A in the trip circuit, and is rated at 30 A for 1second, 7 A for 2 minutes and 3 A continuously. Theinternally operated function target should be selectedif the relay has normally closed output contacts.When targets are specified, the Push-to-Energizeoption described below is included.

OPTIONSIn addition to the range of choices indicated above,the following optional features may be specified.

Instantaneous OvercurrentAn instantaneous overcurrent output may be specified.Included is a front panel control that covers an adjust-ment range of 1 to 40 times the phase overcurrentpickup point as selected by the TAP selector and TAPCAL controls. When this point is exceeded, the Instan-taneous 1 output relay energizes (Figure 2).

For relays having two or three-phase-with-neutralsensing, an independent control adjusts the neutralinstantaneous overcurrent pickup point. When thispoint is exceeded, the INST 1 output relay energizes.

Instantaneous Overcurrent ±2% of pickup settingPickup Measuring Accuracy.

Instantaneous Overcurrent Better than 98% ofPickup Dropout Ratio pickup level.

Instantaneous 2When Option l-2 is selected, an additional independent

control provides the pickup point adjustment for anadditional instantaneous output relay (INST 2). (Thisoption is only available on single-phase units.)

Time Current Characteristic Curve SelectorTwo options permit selecting, by means of a 16-position switch directly behind the front panel, asmany as fifteen timing functions. They are identified asZl and 22 in the style chart.

Option Zl includes the functions illustrated in Figures3 through 11, while Option 22 includes those illus-trated in Figures 3 through 9 plus the BS142 functionsof Figures 12 through 16. Extended timing, whenspecified, applies to all Zl and 22 functions.

Push-to-Energize+Output PushbuttonThe Push-to-Energize pushbutton facilitates testing byenergizing the timed output relay (and auxiliary relay ifpresent). This is accomplished by inserting a thin non-conducting rod through a hole in the front panel.

If an instantaneous relay is present, a second push-button is similarly provided to energize it. A thirdpush-button energizes the Instantaneous 2 relay (ifpresent).

The Push-to-Energize option is supplied whenevertargets are selected.

Power Supply Status OutputThe power supply status output relay has a normallyclosed (NC) output contact. This relay is energizedupon power-up, thus opening its NC contact. Normalrelay operating voltage maintains the power supplystatus output relay continually energized and itsoutput contact open. However, if the power supplyoutput voltage falls below the requirements for properoperation, the power supply status output relaydeenergizes, thus closing the NC output contact.

SURGE WITHSTAND CAPABILITY

Qualified to IEEE C37.90a-1974 Surge WithstandCapability Test.

MECHANICAL

Operating Temperature-40°C (-40°F) to +70°C (+158°F)

Storage Temperature-65°C (-85°F) to +100°C (+212°F)

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BE1-51TC

SPECIFICATIONS, continuedShockIn standard tests, the relay has withstood 15g in eachof three mutually perpendicular axes without structuraldamage, or degradation of performance.

VibrationIn standard tests, the relay has withstood 2g in each ofthree mutually perpendicular axes swept over the rangeof 10 to 500 Hz for a total of six sweeps, 15 minuteseach sweep, without structural damage or degradationof performance.

CaseSize S1 (doubled ended) for single-phase units.Otherwise Size M1 (doubled ended) for all multi-phase units.

WeightSingle-phase 13.0 lb max netThree-phase 17.0 lb max netTwo-phase-and-neutral 17.0 lb max netThree-phase-and-neutral 17.4 lb max net

Time Overcurrent Characteristic Curves6

Figure 2 - Typical Instantaneous Function Response Time

Figure 3 - B1 Short Inverse Figure 4 - B2 Long Inverse Figure 5 - B3 Definite Time

BE1-51TC

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SPECIFICATIONS, continued

Time Overcurrent Characteristic Curves, continued

Figure 6 - B4 Moderately Inverse Figure 7 - B5 Inverse Figure 8 - B6 Very Inverse

Figure 9 - B7 Extremely Inverse Figure 10 - B8 I2T Figure 11 - Timing Types C1 through C8I2T with Limits #1 through #8

BE1-51TC

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CONNECTIONS

Figure 12 - E2 Long Inverse Figure 13 - E4 Inverse (1.3) Figure 14 - E5 Inverse (2.9)(British Standard 142) Curve (British Standard 142) Curve (British Standard 142) Curve

Figure 15 - E6 Very Inverse Figure 16 - E7 Extremely Inverse(British Standard 142) Curve (British Standard 142) Curve

BE1-51TC

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CONNECTIONS, continued

Figure 17 - Control Circuit Connections

Figure 18 - Contact Sensing Connections(for Relays with Power Supply Types J, K, and L)

Figure 19 - Single Phase and Three Phase(Current Sensing Types K and G)

Figure 20 -Three-Phase-With-Neutral(Current Sensing Type H)

Figure 21- Two-Phase-and-Neutral(Current Sensing Type K)

BE1-51TC

CONNECTIONS, continued

Figure 22 - Contact Sensing Connections Using Modules (Only for Relays with Type Z Power Supply)

BE1-51TC

ORDERINGMODEL NUMBERBEl-51TC Time Overcurrent Relay with TorqueControl.

STYLE NUMBERThe style number appears on the front panel, drawoutcradle, and inside the case assembly. This stylenumber is an alphanumeric combination of charactersidentifying the features included in a particular unit.

The sample style number below illustrates the mannerin which the various features are designated. TheStyle Number Identification Chart (page 12) defineseach of the options and characteristics available forthis device.

SAMPLE STYLE NUMBER Gl E-B5J-Bl Cl FThe style number above describes a BE1-51TC TimeOvercurrent Relay with Torque Control having thefollowing features:

(G) 3-phase current sensing.

(1) 0.5 to 12 ampere time overcurrent pickup range.

(E) All output contacts are normally open.

(B5) Inverse time overcurrent function.

(J) Internal operating power is obtained from anexternal 125 Vdc or 100/120 Vac source.

(A) All targets are internally operated. Push-to-Energize pushbuttons are included when targets areselected.

(1) One Instantaneous Overcurrent element.

(C) Isolated contact sensing.

(1) Normally open auxiliary output contacts operateconcurrently with the time overcurrent output relay.

(F) The relay case is configured for flush mounting.

NOTE: Description of a relay must include both themodel number and complete style number.

HOW TO ORDER:Designate the model number, followed by the com-plete style number:

BE1-51TC

Style Number:

Complete the style number by selecting one featurefrom each column of the Style Number IdentificationChart and entering its designation letter or number inthe appropriate square. (Two squares are used toindicate time delay characteristics.) All squares mustbe completed.

STANDARD ACCESSORIES:The following standard accessories are available forthe BE1-51TC Time Overcurrent Relay with TorqueControl.

Test PlugOrder test plug, Basler Electric part number 10095.(Two plugs may be required for complete testingcapabilities).

Extender BoardThe extender board will permit troubleshooting of thePC boards outside the relay cradle. Order Basler partnumber 9 1655 00 100.

BE1-51TC

ROUTE 143, BOX 269, HIGHLAND, ILLINOIS U.S.A. 62249PHONE 618-654-2341 FAX 618-654-2351

P.A.E. Les Pins, 67319 Wasselonne Cedex FRANCEPHONE (33-3-88) 87-1010 FAX (33-3-88) 87-0808

http://www.basler.com, info@basler.com