Instruction manual –AQ F210 Feeder Protection IED
263 (292
)
the breaker is open. This means that the open coil is energized for a short moment even the
breaker is already open. Coil could be energized even moment longer if circuit breaker failure
protection has to be used and incomer is performing the tripping.
8.1.2
T
RIP CIRCUIT OPEN COIL SUPERVISION WITH ONE DIGITAL INPUT AND
CONNECTED AND LATCHED TRIP OUTPUT
The main difference between non-lathed and latched control in trip circuit supervision is that when
latched control is used it is not possible to monitor the trip circuit in open state due the digital input
is shorted by the trip output of the IED.
Figure 8.1.2-5 Trip circuit supervision by using one DI and latched output contact.
It is possible to monitor trip circuit with latched output contact but then monitoring the trip circuit
is possible only while the circuit breaker status is closed. Whenever the breaker is open the TCS
is blocked by an internal logic scheme. The disadvantage is that you don’t know whether the trip
circuit is intact or not when the breaker is closed again.
While the circuit breaker is in open position the TCS alarm is blocked by using following logic
scheme or similar. TCS alarm is giving whenever the breaker is closed and inverted digital input
Содержание AQ-F210
Страница 1: ...INSTRUCTION MANUAL AQ F210 Feeder Protection IED ...
Страница 255: ...Instruction manual AQ F210 Feeder Protection IED 255 292 Figure 7 1 Connection of different sensor types ...
Страница 259: ...Instruction manual AQ F210 Feeder Protection IED 259 292 Figure 7 9 13 Panel cut out and spacing of the AQ 2xx IED ...
Страница 291: ...Instruction manual AQ F210 Feeder Protection IED 291 292 ACCESSORIES ...