GE IS200VGENH1B VME generator board

Description

GE General Electric Technical Specifications: IS200VGENH1B

The only differences in implementing the transfer scheme among the configurations presented above is by

IS200VGENH1B connecting additional logic signals to the relay when available and by placing a jumper on one logic input if the

breaker is non-drawout and has no disconnect auxiliary switches.

Besides the setpoints and logic incorporated into the IS200VGENH1B transfer scheme, the relays make use of some or all of

the logic inputs, phase instantaneous (50P-1 or 2), neutral overcurrent (50N-1 or 2), both line undervoltage ele

ments (27-3 and 27-4), and the synchrocheck (25) features of the relays.

For the following discussion it is assumed that source 1 is the failed side. Identical logic with all 1s and 2s inter

IS200VGENH1B changed applies to relay 2 for a loss of source 2.

A transfer (trip of Incomer 1 followed by closing of the Bus Tie) from relay 1 can be initiated by:

• Operation of transformer 1 lockout relay (86T1).
• Operation of the source 1 breaker auxiliary trip device (94-1).
• Time out of relay 1 line voltage inverse time undervoltage element (27-4) caused by a low voltage on

source 1.

A transfer initiation is blocked if:

• Any of the three breakers is not in the connected state.
• Incoming breaker 2 (which is to become the new source) is presently open.
• An overcurrent condition on bus 1 is detected by 50P-1 or 2 or 50N-1 or 2, to prevent a faulted bus from

being transferred to a healthy source.

• The line voltage definite time undervoltage element (27-3) on source 2 is operated, indicating low voltage

on the other source.

IS200VGENH1B Once a condition has caused relay 1 to initiate a transfer, including the close signal to relay 3 on the Bus Tie

breaker, the command is maintained until relay 1 determines that breaker 1 has opened. When relay 3

receives the close command from relay 1, it is captured and retained until either the Bus Tie breaker closes or

the Block Transfer logic input is received. Relay 3 is inhibited from initiating a close command to breaker 3 by

its synchrocheck element. Synchrocheck is used to provide the bus decayed (residual) voltage permission-to

close, which is only provided when the bus 1 voltage decays to the preset level.

The three breakers are under prevent-parallel checking whenever the transfer scheme is operational. If a third

breaker is closed when the other two breakers are already closed, the scheme will automatically trip the

breaker selected by switch 43/10, ‘Selected To Trip’.

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