Supervision Functions
50BF Circuit-Breaker Failure Protection – 3 Pole
The circuit‑breaker fail protection time delays are initiated either from:
•
A binary output mapped as
Trip Contact
in the
Configuration > Binary Inputs > Input
Matrix
menu, or
•
A binary input mapped as 50BF
Ext Trip
in the
Configuration > Binary Inputs > Input
Matrix
menu. Or
•
A binary input mapped as 50BF
Mech Trip
in the
Configuration > Binary Inputs > Input
Matrix
menu.
Apply a trip condition by injection of current to cause operation of a suitable protection element. Allow current
to continue after the trip at a level of 110 % of the 50BF
Setting
current level on any phase. Measure the
time for operation of 50BF-1
Delay
and 50BF-2
Delay
. Repeat the sequence with the 50BF CB
Faulty
input
energized and ensure the 50BF-1 and 50BF-2 outputs operate without delay, by-passing the timer delay
settings.
Repeat the sequence with current at 90 % of the 50BF
Setting
current level after the element trip and check
for no
CB Fail
operation.
Repeat the sequence by injecting the current to CT4 and using the 50BF-I4
Setting
.
50BF Setting (⋅ I
rated
)
Test Current
50BF-1 Delay
50BF-2 Delay
(110 %)
(90 %)
No Operation
No Operation
50BF CB Faulty
Operation No Delay
Operation No Delay
50BF-I4 Setting (⋅ I
rated
)
Test Current
50BF-1 Delay
50BF-2 Delay
(110 %)
(90 %)
No Operation
No Operation
50BF CB Faulty
Operation No Delay
Operation No Delay
If the circuit‑breaker can also receive a trip signal from a protection function where there is no increase in
current, this trip input should be mapped to 50BF
Mech Trip
in the
Configuration > Binary Inputs
> Input Matrix
menu.
Initiate this binary input and simulate the circuit‑breaker remaining closed by ensuring the
CB Closed
binary
input is energized and ensure operation of the 50BF-1 and 50BF-2 outputs after their programmed delays.
50BF Mech Trip
50BF-1 Delay
50BF-2 Delay
CB Closed
CB Open
No Operation
No Operation
Element Blocking
The
CB Fail
function can be blocked by Binary Input Inhibit. This functionality should be checked.
Element
BI Inhibits
50BF
60CTS CT Supervision
60CTS-I CT Supervision – Current Reference
Apply 3 Phase balanced current to the relay, reduce the current in any 1 or 2 phases to a level below 60CTS-I
setting. Measure the delay to operation.
9.11
9.11.1
9.11.2
Functional Tests
9.11 Supervision Functions
Reyrolle 7SR5, Transformer Protection Device, Device Manual
451
C53000-G7040-C015-1, Edition 11.2019
Содержание Reyrolle 7SR5
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