GEK - 105560
9
t
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t
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t1 = Moment of detection of the fault in protections A and B.
t2 = Tripping order of circuit breakers A and B (it may not happen at the same time).
t3 = Opening of circuit breakers A and B (it may not happen at the same time).
t4 = Spark quenching of the arcs in circuit breakers A and B.
t5 = End of safety waiting period, in order to compensate error clear up discrepancies between circuit
breakers A and B, and order reclosing of circuit breaker B.
t6 = Closure of circuit breaker B and initiation of stabilization of relay signals of synchronism relay A.
t7 = Initiation of the set time in synchronism relay A.
t8 = End of synchronism relay time delay and internal output of synchronization enable.
t9 = Reclose order of circuit breaker A.
t10 = Closure of circuit breaker A.
t11 = Resetting of synchronism relay A.
t12 = End of output enable of synchronism relay A.
∆
1 = Opening time of circuit breakers = 60 ms.
∆
2 = Spark quenching time = 20 ms.
∆
3 = Additional waiting time for discrepancies in opening of circuit breakers A and B.
∆
4 = Closure time of circuit breaker B = 80 ms.
∆
5 = Stabilization time of synchronism relay signals = 30 ms.
∆
6 = Time set in the synchronism relay for voltage checking (setting).
∆
7 = Time for action of output unit of the synchronism relay = 30 ms.
∆
8 = Closure time of circuit breaker A = 80 ms.
∆
9 = Reset time of the synchronism relay = 130 ms.
∆
10 = Sustained time of synchronism enable = 130 ms.
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AB
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