GE 750, Instruction Manual

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GE Power Management 750/760 Feeder Management Relay 11-
1
11 S4 OUTPUT RELAYS 11.1 OVERVIEW
11
11 S4 OUTPUT RELAYS 11.1 OVERVIEW 11.1.1 DESCRIPTION
The 750/760 relay is equipped with eight electromechanical output relays: three special purpose (1 TRIP, 2
CLOSE, and 8 SELF-TEST WARNING) and five general purpose (3, 4, 5, 6, and 7 AUXILIARY). The special
purpose relays have fixed operating characteristics and the general purpose relays can be configured by the
user. Logic diagrams for each output relay are provided for detailed explanation of their operation.
11.1.2 1 TRIP AND 2 CLOSE RELAY OPERATION
Operation of these breaker-control relays is designed to be controlled by the state of the circuit breaker as
monitored by a 52a or 52b contact. Once a feature has energized one of these relays it will remain operated
until the requested change of breaker state is confirmed by a breaker auxiliary contact and the initiating condi-
tion has reset. If the initiating feature resets but the breaker does not change state, the output relay will be
reset after either the delay programmed in the Breaker Operation feature or a default interval of 2 seconds
expires. If neither of the breaker auxiliary contacts 52a nor 52b is programmed to a logic input, the 1 TRIP relay
is de-energized after either the delay programmed in the Breaker Failure feature or a default interval of 100
milliseconds after the initiating input resets and the 2 CLOSE relay is de-energized after 200 milliseconds. If a
delay is programmed for the Trip or Close contact seal in time, then this delay is added to the reset time. Note
that the default setting for the seal in time is 40 ms.
11.1.3 3-7 AUXILIARY RELAY OPERATION
Operation of these relays is programmed by the user. Each relay can be selected to become either energized
or de-energized when operated, and to operate as latched, self-resetting or pulsed.
Table 11–1: BREAKER AUXILIARY CONTACTS AND RELAY OPERATION
52a CO N TAC T
INS TALLED ? 52b CO NTAC T
INS TALLED ? RE LAY O PE RATIO N
Yes Yes 1 TRIP relay remains operating until 52b indicates an open breaker.
2 CLOSE relay remains operating until 52a indicates a closed breaker.
Yes No 1 TRIP relay remains operating until 52a indicates an open breaker.
2 CLOSE relay remains operating until 52a indicates a closed breaker.
No Yes 1 TRIP relay remains operating until 52b indicates an open breaker.
2 CLOSE relay remains operating until 52b indicates a closed breaker.
No No 1 TRIP relay operates until either the Breaker Failure delay expires (if the Breaker
Failure element is enabled) or 100 ms after the feature causing the trip resets.
2 CLOSE relay operates for 200 ms.
Table 11–2: AUXILIARY RELAY OPERATION
OUTPUT TYPE DESCRIPTION
Latched Upon being operated by any programmed feature, the relay output contacts change state and
remain in the new state. The relay can be returned to the non-operated state only by the RESET key,
the reset logic input, or a computer reset command. This mode is used for alarms which must be
acknowledged, or to provide a lockout function.
Self-resetting Upon being operated by any programmed feature, the relay output contacts change state and
remain in the new state until all features which operate the relay are no longer signaling it to operate.
For a relay operated by a single feature, the output contacts follow the state of the feature.
Pulsed Upon being operated by any programmed feature, the relay output contacts change state and
remain in the new state for a programmed time interval called the
PULSED OUTPUT DWELL TIME
.
The dwell timer is started when the first feature causes operation of the output relay.