P746/EN AP/G31
Application Notes
(AP) 6-
14
MiCOM
P746
The examples above consider direct tripping of a 2-cycle circuit breaker. Note that where
auxiliary tripping relays are used, an additional 10-15ms must be added to allow for trip relay
operation.
The phase undercurrent settings (
Ι
<) must be set less than load current, to ensure that
Ι
<
operation indicates that the circuit breaker pole is open. A typical setting for overhead line or
cable circuits is 20%
Ι
n, with 5%
Ι
n common for generator circuit breaker CBF.
2.3.2.2 External backtrip order
When a direct backtrip order needs to be used to trip a dedicated zone, the following PSL
shall be used:
AP
FIGURE 1: EXTERNAL BACKTRIP ORDER
Содержание MiCOM P746
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