Alstom MiCOM P127 - Submenu Circuit Breaker Fail (P126 & P127)

Technical Guide P12y/EN FT/D22
User Guide
MiCOM P125/P126/P127 Page 93/108
Cold Load PU
tI2>>? No
Assigning the second trip threshold for negative
sequence overcurrent (I2>>) to cold load pick up
function.
Setting choice: Yes, No
Cold Load PU
tI2>>>? No
Assigning the third trip threshold for negative sequence
overcurrent (I2>>>) to cold load pick up function.
Setting choice: Yes, No
Cold Load PU
tTherm>? No
Assigning the trip threshold for thermal overload
(tTherm>?) to cold load pick up function.
Setting choice: Yes, No
Cold Load PU
Level 200 %
Displays scaling value, in percent, for the cold load
pick up assigned to the selected thresholds.
Setting range is from 100% to 500%, in steps of 1%.
Cold Load PU
tCL 3600.0 s
Displays delay timer setting (tCL) for the Cold Load
Pick-up function.
Setting range is from 0.1 to 3600 s, in steps of 100ms.
4.6.10 Submenu Circuit Breaker Fail (P126 & P127)
With the CB Fail submenu circuit breaker failure can be detected and associated
parameters can be set. This protection feature is only available for P126 & P127
relays.
CB Fail
Heading of CB Fail sub menu.
To navigate within submenu points, press 8 2. To
modify setting, press 5. Use 8 2 4 6 to scroll and set
available selections. Press 5 to confirm choice.
CB Fail ?
No
Selection of the circuit breaker failure function.
Setting choice: Yes, No
If Yes is selected, the following menu is displayed:
If No is selected, the CB Fail function is inactive.
I< BF
0.02 In
Selection of the under current threshold associated to
the CB failure detection function.
Select from 0.02 In to 1 In by step of 0.01 In.
CB Fail Time
tBF 0.00 s
Displays time delay setting (tBF) for the CB Fail
function.
Setting range is from 0 to 10 s, in steps of 10 ms.
Block I>?
Yes
Select the possibility to block the instantaneous signal
I> in case of circuit breaker failure detection.
Select Yes or No.