GE IS200VCRCH1BBB IS200VCRCH1BBC MK6 circuit board

Description

GE General Electric Technical Specifications: IS200VCRCH1BBB

The relay has a total of six phase, two neutral, one ground, one sensitive ground, and one negative sequence

IS200VCRCH1BBB time overcurrent elements. The programming of the time-current characteristics of these elements is identical

in all cases and will only be covered in this general section. The required curve is established by programming

a Pickup Current, Curve Shape, Curve Multiplier, and Reset Time. The Curve Shape can be either a standard

IS200VCRCH1BBB shape or a user-defined shape programmed with the FlexCurve™ feature.

Accurate coordination may require changing the time overcurrent characteristics of particular elements under

different conditions. For manual closing or picking up a cold load, a different time-current characteristic can be

produced by increasing the pickup current setting. In the 760, the pickup current can also be raised between

autoreclose shots. The following setpoints are used to program the time-current characteristics.

The IS200VCRCH1BBB pickup current is the threshold current at which the time overcurrent ele

ment starts timing. There is no intentional ‘dead band’ when the current is

above the pickup level. However, accuracy is only guaranteed above a 1.03

per unit pickup level. The dropout threshold is 98% of the pickup threshold.

Enter the pickup current corresponding to 1 per unit on the time overcurrent

curves as a multiple of the source CT. For example, if 100: 5 CTs are used and

a pickup of 90 amps is required for the time overcurrent element, enter 0.9 x

CT。

Select the desired curve shape. If none of the standard curve shapes is appro

priate, a custom FlexCurve™ can be created by entering the trip times at 80

different current values. See S2 SYSTEM SETUP \ FLEXCURVE A. Curve formulas

are given for use with computer based coordination programs (NOTE: Calcu

lated trip time values are only valid for I/Ipu > 1). Select the appropriate

curve shape and multiplier, thus matching the appropriate curve with the pro

tection requirements.

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