PCD230A 3BHE022291R0101 ABB Input and Output Device of Excitation System

PCD230A 3BHE022291R0101 ABB Input and output device of excitation system

PCD230A 3BHE022291R0101 ABB Input and output device of excitation system

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If stage U0>> has started and the residual voltage falls below the set start value of

the stage, the start of the stage remains active for 100 ms. If the residual voltage

exceeds the set start value again while the timer is running, the timer is cleared and

the start of the stage remains active. If stage U0>> has already tripped, the stage is

reset in 50 ms after the residual voltage falls below 0.5 times the set start value of

the stage. However, if stage U0>> has already tripped and the residual voltage has

fallen below the set start value of the stage, but not below 0.5 times the set start

value, the stage is reset after the 100 ms’ resetting time has expired.

Stage U0> can be set out of operation in SGF3/3 and stage U0>> can be set out of

operation in SGF3/4. This state is indicated by dashes on the LCD and by 999

when the set start value is read via serial communication.

It is possible to block the tripping of a residual overvoltage stage by

applying a digital input signal to the relay.

5.1.4.5. Circuit-breaker failure protection

The circuit-breaker failure protection (CBFP) detects situations where the trip

remains active although the circuit breaker should have operated.

The CBFP unit generates a trip signal via output PO2 when the set operate time of

CBFP expires.

The CBFP can be triggered internally via protection functions. All the signals,

except external trip, routed to output PO1 trigger the CBFP. If the fault situation is

not cleared when the set operate time has elapsed, the CBFP generates a trip signal

via output PO2.

The CBFP can also be selected to be triggered externally by applying a digital input

signal to the relay, if the maximum of all three phase-to-phase voltages is above 0.15

× Un. If the fault situation is not cleared when the set operate time has elapsed, the

CBFP generates a trip signal via output PO2.

Internal triggering is selected by activating the CBFP in SGF1/6 and external

triggering by activating the CBFP in SGB1...5/7.

Normally, the CBFP controls the upstream circuit breaker. However, it can also be

used for tripping via redundant trip circuits of the same circuit breaker.