GE IS200VTURH1BAC Turbine control PCB board

Description

GE General Electric Technical Specifications: IS200VTURH1BAC

The IS200VTURH1BAC procedure to test this element is identical to that outlined for Section 17.7.3: PHASE TIME OVERCUR

RENT 1 on page 17–21, with the following exceptions.

Current is injected into any one phase of the phase input terminals and the negative sequence current magni

tude is 1/3 of the injected current. The element is not subject to the “phases required for operation” or “voltage

restrained time overcurrent” tests.

IS200VTURH1BAC Blocking From Logic Inputs

1. Inject current to cause a pickup.
2. Assert a logic input to provide a “Block Neg Seq Time”. The PICKUP indicator should immediately go out.
3. Repeat steps 1 and 2 for logic input “Block All O/C” and “Block 1 TRIP Relay” as required.

The procedure to test this element is identical to that outlined for Section 17.7.5: PHASE INSTANTANEOUS

OVERCURRENT 1 on page 17–24, with the following exceptions.

IS200VTURH1BAC Current is injected into any one phase of the phase input terminals and the negative sequence current magni

tude is 1/3 of the injected current. The element is not subject to the “phases required for operation” test and not

subject to the tests “linear reset timing” and “voltage restrained time overcurrent”.

IS200VTURH1BAC Blocking From Logic Inputs

1. Inject current to cause a pickup.
2. Assert a logic input to provide a “Block Neg Seq Inst”. The PICKUP indicator should immediately go out.
3. Repeat steps 1 and 2 for logic input “Block All O/C” and “Block 1 TRIP Relay” as required.

Test Connections per Figure 17–1: RELAY TEST WIRING – WYE CONNECTION on page 17–4.

A negative sequence voltage can be created by injecting a single phase voltage, or a set of three single-phase

voltages with a known negative sequence component. For single phase injection the negative sequence volt

age magnitude is the injected voltage divided by 3.

Pickup:

1. Inject a negative sequence voltage = 0 into the bus voltage input of the relay. The PICKUP indicator should

be off.

2. Slowly raise the voltage until the PICKUP indicator comes on. This is the pickup level.
3. Lower the voltage until the PICKUP indicator goes out. This is the reset voltage, which should be 2% of VT

less than the pickup level.

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