VAMP 135 - Circuit-Breaker Failure Protection CBFP (50 BF)

VAMP Ltd
Over-, under-, residual voltage and
frequency relay
Technical description
VAMP 135
VM135.EN008 VAMP 24h support phone : +358 (0)20 753 3264
15
Parameters of the frequency stages:
f<, f<< (81L)
f<, f<< (81L)f<, f<< (81L)
f<, f<< (81L)
Parameter
ParameterParameter
Parameter Value/unit
Value/unitValue/unit
Value/unit
Measured
value
f Hz Frequency
f<, f<< Hz Frequency as primary value Setting
values
t<, t<< s Operation time
SCntr Start counter (Start) reading Recorded
values
TCntr Trip counter (Trip) reading
2.3.6. 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 drop-out 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) and remains
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.
U>
U>>
U<<
U<
Uo>
Uo>>
f>
f>>
f<
f<<
tcbfpset
R2
t
&
R1
Setting
t>
CBPF
blocking
Figure 2.3.6-1. 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
CBFPCBFP
CBFP (50BF)
(50BF) (50BF)
(50BF)
Parameter
ParameterParameter
Parameter Value/unit
Value/unitValue/unit
Value/unit
CBRel Relay to be supervised Setting
values
t> s Operation time
SCntr Start counter (Start) reading Recorded
values
TCntr Trip counter (Trip) reading