GE IS200VTURG1B MARK VI VME turbine card

Description

GE General Electric Technical Specifications: IS200VTURG1B

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

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

Current is injected into any one phase, and the element is not subject to the test “phases required for opera

tion”, and not subject to the tests “linear reset timing” and “voltage restrained time overcurrent”.

IS200VTURG1B Blocking From Logic Inputs

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

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

OVERCURRENT 1 on page 17–24, with the following exceptions. Current is injected into any one phase, and

the element is not subject to the test “phases required for operation”, and not subject to the tests “linear reset

timing” and “voltage restrained time overcurrent”.

IS200VTURG1B Blocking From Logic Inputs

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

If dual polarizing is required, check the operation of the voltage and current polarized elements individually as

outlined below, then check the overall dual polarized response as outlined at the end of this section.

1. a) IS200VTURG1B FORWARD TRIPPING WITH VOLTAGE POLARIZATION

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

Figure 17–4: NEUTRAL DIRECTIONAL – VOLTAGE POLARIZED FOWARD OPERATING REGIONS below is

a plot of the operating characteristic of the voltage polarized neutral directional feature for various settings of

MTA. Other characteristics for specific MTA settings can be deduced from this diagram. Note that the diagram

is plotted for the residual current referred to the system faulted-phase phase-to-neutral voltage.

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