GE IS200VPROH1B IS200VPROH1BCA Turbine protection plate

Description

GE General Electric Technical Specifications: IS200VPROH1B

This element is used as an input to transfer scheme logic in this application, and therefore the function setpoint

IS200VPROH1B must be set to Control. An Undervoltage 3 operation is used to signal relay 2 to block transfer initiation from

that relay, because source 1 is experiencing low voltage. Also, 27-3 is enabled by instantaneous overcurrent to

block transfer initiation. This ensures that if a fault on the load side of bus 1 causes a dip below the undervolt

IS200VPROH1B age pickup setting, transfer will not be initiated until the voltage has risen above the voltage setting for the inter

val established by the TRANSFER DELAY THIS SOURCE setpoint. The pickup setting of 27-3 should be below the

minimum expected normal (low) voltage, usually around 0.9 Pick Up voltage. A Definite Time curve with the

delay set to zero provides instantaneous operation. The minimum operating voltage must be set to zero.

This element is used as an input to transfer scheme logic in this application, and therefore the function setpoint

IS200VPROH1B should be set to Control. An Undervoltage 4 operation is used to initiate a transfer on loss-of-source. Typical

settings have a pickup about 0.7 to 0.8 of Pick Up voltage, a curve setting selected as ‘Inverse Time’, and a

delay setting to provide operation in 0.7 to 1.4 seconds at 0 volts. The minimum operating voltage must be set

to zero.

IS200VPROH1B Synchrocheck (25) (Incomers 1 and 2 only)

The synchrocheck function can be selected as either Control or Alarm. It is imperative that setpoint DEAD

SOURCE PERMISSIVE be set to LL&DB (Live Line and Dead Bus) to allow initial closing of the incoming breakers.

The user establishes all other setpoints for this element.

IS200VPROH1B Synchrocheck (25) (Bus Tie only)

This element is used to provide synchronism check supervision when paralleling the busses. The Dead Source

Permissive portion of this feature is also used to measure the residual voltage on the bus that has lost source.

To ensure that transfers are supervised by the decayed voltage magnitude only, the ‘in-synchronism’ elements

are blocked while a transfer is in progress. The synchrocheck function can be selected as either Control or

Alarm. It is imperative that setpoint DEAD SOURCE PERMISSIVE be set to either DL|DB (Dead Line or Dead Bus)

or DLXDB (Dead Line or Dead Bus, but not both) to allow for transfers to either incomer.

The DEAD BUS MAXIMUM VOLTAGE and DEAD LINE MAXIMUM VOLTAGE setpoints establish the level of decayed volt

age above which transfers are inhibited. A normal setting for this element is about 0.25 Pick Up of nominal volt

age. Because the 750/760 measures a single phase-phase voltage, these values should be multiplied by 1 / √3

to cover the case of a phase-ground fault on a measured phase reducing that phase voltage but leaving the

other two phases at a higher voltage. If experience shows this setting causes a delay of transfer presenting

problems, it is occasionally raised to a maximum of 0.40 Pick Up. The user establishes all other setpoints for

this element.

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