Alstom MiCOM P546 - 1.3.8 Negative sequence overcurrent

Settings P54x/EN ST/La4
MiCOM P543, P544, P545, P546
(ST) 4-33
ST
haracteristics. The first two stages of negative
have definite time characteristics only.
1.3.8 Negative sequence overcurrent
The negative sequence overcurrent protection included in the MiCOM P54x provides four
stage non-directional/ directional phase segregated negative sequence overcurrent
protection with independent time delay c
sequence overcurrent protection have time-delayed characteristics which are selectable
between inverse definite minimum time (IDMT), or definite time (DT). The third and fourth
stages
Setting range
Menu text Default setting
Min. Max.
Step size
2>1 Status
Disabled Disabled or Enabled N/A
Setting to enable or disable the first stage negative sequence element.
2>1 Function
DT
Disabled, DT, IEC S Inverse,
IEC V Inverse, IEC E Inverse,
UK LT Inverse, IEEE M Inverse,
IEEE V Inverse, IEEE E Inverse,
US Inverse, US ST Inverse
Setting for the tripping characteristic for the first negative sequence overcurrent stage
element.
2>1Direction
Non-directional
Non-directional
Directional Fwd
Directional Rev
N/A
This setting determines the direction of measurement for this element.
2>1 Current Set 0.2 x n 0.08n 4n 0.01n
Pick-up setting for the first stage negative sequence overcurrent element.
2>1 Time Delay
10 0 s 100 s 0.01 s
Setting for t erating e f gative sequence overcurrent he op time-delay for th irst stage ne
element.
2>1 TMS
1 0.025 1.2 0.005
Setting for the time multiplier setting to adjust the operating time of the IEC IDMT
characteristic.
2>1 Time Dial
1 0.01 100 0.01
Setting for the time multiplier setting to adjust the operating time of the IEEE/US IDMT
curves.
2>1 Reset Char.
DT DT or Inverse N/A
Setting to determine the type of reset/release characteristic of the IEEE/US curves.
2>1 tRESET
0 0 s 100 s 0.01 s
Setting that determines t lease time fohe reset/re r definite time reset characteristic.
2>2 Cells as for 2>1
Above
2>3 Status
Disabled Disabled or Enabled N/A
Setting to enable or disable the third stage negative sequence element.
2>3 Direction
Non-directional
Non-directional
Directional Fwd
Directional Rev
N/A
T ines t rection of measure or this el . his setting determ he di ment f ement