GE P742

P74
x/EN ST/Na7
Settings
(ST) 4
-
24
MiCOM P74
1, P742, P743
ST
Menu Text Default Setting
Setting Range
Step Size
Min. Max.
Man Close Pulse 0.50s 0.10s 10.00s 0.01s
Defines the duration of the close pulse.
Man Trip Pulse 0.50s 0.10s 5.00s 0.01s
Defines the duration of the trip pulse.
Man Close Delay 10.00s 0.01s 600.00s 0.01s
This defines the delay time before the close pulse is executed.
87BB Trip Delay 0s 0s 0.400s 5ms
Sets the differential busbar protection (87BB) tripping delay time (to allow a sequential
tripping of all feeders connected to the faulty zone). The trip relays outputs will be closed
even if the CU trip signal is released before the end of the timer.
CB Superv Timer 150ms 10ms 400ms 5ms
Setting for the operating time delay of the phase Circuit Breaker Supervision: The CB
alarm status will be displayed If both 52A and 52B are detected more than “CB Superv.
Timer”.
1.3.2 “CT and VT ratios” column (P742 / P743)
This column is visible when the “CT & VT ratios” setting (“Configuration” column) = “visible”.
Menu Text Default Setting
Setting Range
Step Size
Min. Max.
CT AND VT RATIOS
Phase CT Primary 1.000A 1A 30kA 1
Sets the phase Current Transformer input primary current rating.
Phase CT Sec’y 1.000A 1 5 4
Sets the phase Current Transformer input secondary current rating.
RBPh / RBN 1 0.5 10 0.1
Sets the ratio between the phase lead burden and the neutral lead burden.
Power Parameters
Standard input British Standard British Standard / IEC
Sets the Current Transformer knee point voltage when the British standard has been
chosen.
BRITISH STANDARD
Knee voltage V
k
250/I
n
V 100/I
n
V 5000/I
n
V 10/I
n
V
Sets the Current Transformer knee point voltage when the British standard has been
chosen.
IEC
Rated Burden VA
25 VA 5 VA 100 VA 1 VA
Sets the Current Transformer power when the IEC standard has been chosen.
IEC
Rated Burden Ohm
(calculated value)
25 / I
n
2
Ω 5 / I
n
2
Ω 100 / I
n
2
Ω 1 / I
n
2
Ω
Calculated value from the Rated Burden set in VA