BE1-60

1

APPLICATIONpage 2

SPECIFICATIONSpage 3

EXTERNALCONNECTIONS

page 5

ORDERINGINFORMATION

page 7

The BE1 -60 Voltage Balance Relay's solid-state design provides areliable instantaneous response to block other devices from incorrectoperation resulting from a blown fuse or other fault in a potential trans-former circuit.

FEATURES• Pickup adjustable in 5% increments over a range of 5 to 50% of

nominal voltage.

• Single-phase to single-phase, single-phase to three-phase, or three-phase to three-phase sensing.

• Maximum trip time of 100 milliseconds for voltage differences greaterthan three times the setting.

• Low sensing and supply burdens.

• Qualified to the requirements of- IEEE C37.90.1-1989 ,IEC 60255-5, and IEC60255-5/6 for surge withstand capability;- IEEE C37.90.1-1989 for fast transient;- IEC 60255-5 for impulse.

• UL Recognized per Standard 508, UL File #E97033.

• Gost R certified; complies with the relevant standards of Gosstandartof Russia.

• Five year warranty.

ADDITIONAL INFORMATIONINSTRUCTION MANUAL

Request Publication 9170700990

STANDARDS, DIMENSIONS and ACCESSORIESRequest Bulletin SDA

BE1-60VOLTAGE BALANCE

RELAY

UBS-55-10

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

BE1-60

2

PURPOSEThe BE1-60 Voltage Balance Relay is intended toprovide high speed protection for power systemsequipment and protective systems from misoperationor false tripping in the event of a sudden loss of sensingpotential resulting from a blown fuse. The relay isapplied to detect this condition and initiate the requiredcorrective/preventative action as well as indicate theproblem and its location.

Devices that may require this form of protection in-elude voltage control or restraint types of overcurrentrelays, impedance measuring relays, synchronizingrelays, voltage regulators and static excitation systems.

In the system shown in Figure 1, the generator isequipped with a static exciter and includes voltagecontrolled or restrained time overcurrent relays in itsprotection package (as well as other devices). If one ofthe fuses in the power potential transformer blows, theresulting unbalanced voltage condition may causeexcessive heating in the power stage of the staticexciter. For this condition it is desirable to alarm thecondition and initiate an orderly shutdown of the unit.Output #l would accomplish this task.

APPLICATION

Figure 1 - Typical Application

If one of the fuses in the sensing potential transformerwere to open up, the static exciter (with 3-phasesensing) would increase its output to maximum in anattempt to restore the sensed voltage to its properlevel. For this condition, the BE1-60 Voltage BalanceRelay would initiate an emergency shutdown of theunit and alarm the condition. Output #2 would accom-plish this task.

Also in this case, since the same potential sourceprovides the restraint or control input to the timeovercurrent relays, false tripping of the unit may resultby operation of the overcurrent function. This is notdesirable as the overcurrent relay’s target would give afalse indication of the reason for tripping. Output #2would be required to block operation of the overcur-rent devices. This would be accomplished by openinga normally closed contact from the BE1-60 which is inseries with the tripping outputs from the overcurrentfunctions.

Note: 1) If the overcurrent functions were voltagecontrolled and the output current was inexcess of the pickup setting of the relay, aloss of control potential would allow thisovercurrent function to pickup and starttiming. Without the inhibit from the BE1-60,undesired overcurrent tripping would result.

2) If the overcurrent functions were voltagerestrained, the loss of a restraint potentialwould result in the sensitivity of the relaybeing increased (0.25 times setting), and therelay would pickup and start timing. Again,without the inhibit from the BE1-60, undes-ired overcurrent tripping would result.

Targets on the BE1-60 indicate that CKT #l (PowerPotential Transformer Fuse) or CKT #2 (SensingPotential Transformer Fuse) caused the current shut-down sequence.

When setting the relay’s % difference pickup, consider-ation should be given to the maximum voltage excur-sions permitted for normal operating conditions. Forinstance if the output voltage of the power potentialtransformer varies 5 percent from machine no load tomachine full load then the setting must permit thisfluctuation.

It should also be noted that since both of the inputs tothe BE1-60 are monitoring essentially the samevoltage, tripping of the BE1-60 will not occur forsystem faults.

BE1-60

3

FUNCTIONAL DESCRIPTIONThe specifications on these pages define the manyfeatures and options that can be combined to satisfyan application requirement. The block diagram inFigure 2 illustrates how various standard features, aswell as the options, function.

INPUTSVoltage SensingSystem potential transformers with 120/208 V second-aries supply the Voltage Balance Relay’s input trans-formers with single and/or three-phase voltages fromthe two monitored circuits. Each phase voltage isscaled, rectified, and integrated to establish a dc levelwhich represents the voltage level of that particularphase.

Nominal sensing input ratings, defined by the stylenumber, are 208 VL-L for wye, 120 VL-L for delta, and120 Vac for single-phase with a maximum burden of1 VA per phase at 50/60 Hz. The sensing range is 60%to 125% of nominal voltage within the frequency rangeof 45 to 65 Hz. The maximum continuous voltagerating is 160% of nominal.

Figure 2 - Functional Block Diagram

SPECIFICATIONS

Power Supply InputsOne of five power supply types may be selected toprovide internal operating power. They are describedin Table 1.

Table 1 - Power Supply Options

Type O P R S T

Nominal 48 Vdc 125 Vdc 24 Vdc 48 Vdc 250 Vdc Voltage 120 Vac 125 Vdc 240 Vac

Burden 1.1 W 1.4 W 1.2 W 1.1 W 1.6 W11.2 VA 1.4 W 18.8 VA

DIFFERENTIAL AMPLIFIERThe output from the rectifier and integrator circuits isapplied to two differential amplifiers. These differentialamplifiers determine which circuit has the lowestvoltage and the magnitude of the voltage differencebetween the two monitored circuits.

BE1-60

4

SPECIFICATIONS, continued

LIMIT SWITCHA front panel ten position thumbwheel switch, ad-justable in 5% increments from 5 to 50% of nominalvoltage, sets the voltage difference pickup level.

LIMIT COMPARATORThe magnitude of the voltage difference is comparedto the limit setting. When the limit setting is exceeded,energization of the ouput relays associated with thecircuit having the lower voltage level occurs. Pickupaccuracy is within 1.5 volts or 5% of the limit setting.When the voltage difference falls to less than the limitsetting, the output relays are de-energized after adelay of approximately 0.75 seconds. Dropout is 90%or greater of the pickup value.

TARGETSElectronically latched, manually reset, target indicatorsare optionally available to indicate that an output hastripped. Either internally operated or current operatedtargets may be specified. Current operated targetsrequire 0.2 A in the output trip circuit to actuate, andtrip circuit current must not exceed 30 A for 0.2 sec-onds, 7 A for 2 minutes, and 3 A continuous. Currentoperated targets may be selected only when normallyopen (NO) output contacts have been specified.

OUTPUTSOutput contacts are rated as follows:

Resistive120 Vac: Make, break, and carry 7 Aac continuously.

250 Vdc: Make and carry 30 Adc for 0.2 s, carry 7 Adc continuously, break 0.3 Adc.

500 Vdc: Make and carry 15 Adc for 0.2 s, carry 7 Adc continuously, break 0.3 Adc.

Inductive120 Vac, 125 Vdc, 250 Vdc - Break 0.3 A (L/R = 0.04).

Push-to-Energize Output PushbuttonsAccessible with a thin nonconducting rod through thefront panel, push-to-energize pushbuttons are availableto energize each output for testing the external control/protective system wiring.

POWER SUPPLY STATUS OUTPUTThe power supply output relay is energized and its NCoutput contact is opened when power is applied to therelay. Normal internal relay operating voltage main-tains the power supply status output relay in a continu-ously energized state with its output contact open. Ifthe power supply output voltage falls below therequirements of proper operation, the power supplyoutput relay is de-energized, closing the NC outputcontact.

MECHANICAL

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

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

Weight14.25 pounds (6.46 kg) maximum

ShockWithstands 15 G in each of three mutually perpendicu-lar planes.

VibrationWithstands 2 G in each of three mutually perpendicularaxes, swept over the range of 10 to 500 Hz for a totalof six sweeps, 15 minutes each sweep.

Surge Withstand CapabilityQualified to IEEE C37.90-1989 (transient immunity andradiated susceptibility), IEC 60255-5 (impulse require-ments), and IEC60255-5/6 (surge requirements).

Radio Frequency Interference (RFI)Type tested using a 5 W, handheld transceiver in theranges of 144 and 440 MHz with the antenna placedwithin 6 inches (152 mm) of the relay.

BE1-60

5

CONNECTIONS

Figure 3 - Sensing Input Connections

BE1-60

6

CONNECTIONS, continued

Figure 4 - Typical Output Connections

BE1-60

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MODEL NUMBERBE1-60 Voltage Balance Relay

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. The StyleNumber Identification Chart (page 8) defines each ofthe options and characteristics available for thisdevice.

SAMPLE STYLE NUMBER: D1FA1PC1C2FThe style number above describes a BE1-60 VoltageBalance Relay having the following features.

Sensing Input Type (D) Three-phase wye to three-phase delta

Sensing Input Range (1) 60 to 125% of nominalvoltage

ORDERING

Output (F) Two normally open outputrelays (one per circuit)

Timing (A1) Instantaneous

Power Supply (P) 125 Vdc or 100/120 Vacexternal operating power

Target (C) Two internally operatedtargets (one per circuit)

Option 1 (1) Power supply status output

Option 2 (C) Push-to-energize outputs

Option 3 (2) Two normally closedauxiliary output contacts(one per circuit)

Option 4 (F) Semi-flush mounting

Note: The description of a complete relay must includeboth the model number and the style number.

HOW TO ORDER:Designate the model number, followed by thecomplete style number:

BE1-60

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 ACCESSORY:The following accessory is available for the BE1-60Voltage Balance Relay.

Test PlugTo allow testing of the relay without removing systemwiring, order two test plugs, Basler Electric partnumber 10095.

D 1 F A C1 P C FBE1-60

MODEL NO.

SENSING

INPUT

TYPE

SENSING

INPUT

RANGE

OUTPUT TIMING POWER

SUPPLY

TARGET OPTION 1 OPTION 2 OPTION 3 OPTION 4

21

BE1-60

8

ORDERING

Printed in U.S.A.

OPTION 3

OPTION 4OPTION 2

OPTION 1

SUPPLY

RANGE

SENSING INPUT

1

POWER

BE1-60

MODEL NO.

SENSING INPUT

TYPE

TIMING

TARGET

A1) Instantaneous 0) None

1) Power supply

status

output

N) None

C) Push-to-

energize

F) Semi-flush

mounting

P) Projection

mounting

A 1

A) Single-phase

B) Three-phase,

wye

C) Three-phase,

delta

D) Three-phase,

(1) wye

(2) delta

E) Single-phase/

three-phase

(wye)

F) Single-phase/

three-phase

(delta)

1) 60-125% of

nominal voltage

1

F) Two relays:

circuit #1, NO

circuit #2, NO

H) Two relays:

circuit #1, NC

circuit #2, NC

N) Two relays:

circuit #1, NO

circuit #2, NC

P) Two relays:

circuit #1, NC

circuit #2, NO

OUTPUT

O) 48 Vdc

P) 125 Vdc or

100/120 Vac

R) 24 Vdc

S) 48 Vdc/125 Vdc

T) 250 Vdc/

240 Vac

2

N) None

C) Two targets,

internally

operated

D) Two targets,

current

operated

3

outputs

0) None

1) Two auxiliary

relays-NO

2) Two auxiliary

relays-NC

3) Two auxiliary

relays-SPDT

Nominal sensing input voltages are:

120 Vac for single-phase, 208 Vac

L-L for wye, 120 Vac L-L for delta.

When target is "D", output must

be "F".

When option 1 is "1" and option

3 is "1", "2", or "3", the circuit

#2 auxiliary output relay is dedicated

for the power supply status output.

The circuit #1 auxiliary output relay

operates when the main output

relay for either circuit #1 or circuit

#2 operates.

All relays are supplied in an S1 size

case.

1

2

3

4.

NOTES:

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