GE IS200TSVOH1A IS200TSVOH1B Power card

Description

GE General Electric Technical Specifications: IS200TSVOH1A

If a breaker can be a paralleling point between two generation sources, it is common practice to automatically

IS200TSVOH1A perform a check to ensure the sources are within allowable voltage limits before permitting closing of the

breaker. Synchrocheck provides this feature by checking that the bus and line input voltages are within the pro

grammed differentials of voltage magnitude, phase angle position, and frequency. If this feature is enabled, the

IS200TSVOH1A check will be performed before either manual close or automatic reclose signals can operate the 2 CLOSE out

put relay. The synchrocheck programming can allow for permitted closing if either or both of the sources are

de-energized. The measured line input voltage magnitude and frequency are also made available as Actual

Values under A2 METERING \ SYNCHRO VOLTAGE. The frequency is only displayed if the voltage at the relay termi

nals is at least 10.0 volts. The differential values of angle, magnitude, and frequency are also made available

for display.

The 750/760 can be programmed to block instantaneous overcurrent elements and to raise the pickup level of

time overcurrent elements when a cold load condition is detected. Under normal operating conditions, the

actual load on a feeder is less than the maximum connected load, since not all consumers require maximum

IS200TSVOH1A load at the same time. When such a feeder is closed after a prolonged outage, the feeder inrush and motor

accelerating current may be above some protection settings. Without historical data on a particular feeder,

some utilities assume an initial cold load current of about 500% of normal load, decaying to 300% after one

second, 200% after 2 seconds, and 150% after 4 seconds. See the figure below.

A cold load condition is initiated and overcurrent settings are altered when all phase currents drop below 5% of

the nominal current for an amount of time greater than the OUTAGE TIME BEFORE COLD LOAD. The cold load con

dition can also be immediately initiated by asserting the logic input function ‘Cold Load Pickup’. Overcurrent

settings are returned to normal after any phase current is restored to greater than 10% of nominal and then a

timer of duration equal to COLD LOAD PICKUP BLOCK TIME expires.

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