VAMP 150
Motor protection relay
Technical Description
VAMP Ltd
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Vamp 24h support phone : +358 (0)20 753 3264
VM150.EN005
2.2.10.
Circuit-breaker failure protection CBFP (50BF)
The operation of the circuit-breaker failure protection is based
on the supervision of the operating time, from the pick-up of
the trip relay (T1) to the dropout of the same relay. If that time
is longer than the set operating time of the CBFP stage, the
CBFP stage is activated (trip relay T2) remaining activated,
until the T1 relay resets. The supervised - and tripping relay
can be configured.
The CBFP stage functions also in earth-fault situations,
because its function is merely based on supervision of the
function of the output relay T1.
Figure 2.2.10-1. Block diagram of the circuit-breaker failure protection
The CBFP blocking signal prevents the CBFP stage from
operating, when the output relays or any other protection
function is operated by forced control.
Parameters of the circuit-breaker failure protection:
CBFP (
CBFP (
CBFP (
CBFP (50BF)
50BF)
50BF)
50BF)
Parameter:
Parameter:
Parameter:
Parameter:
Value/unit:
Value/unit:
Value/unit:
Value/unit:
CBRel
Relay to be supervised
Setting
values
t>
s
Operation time [s]
SCntr
Start counter (Start) reading
Recorded
values
TCntr
Trip counter (Trip) reading
