Settings P54x/EN ST/La4
MiCOM P543, P544, P545, P546
(ST) 4-31
ST
1.3.7 Phase t protecti
The overcurrent protection included in the MiCOM P54x provides four stage non-directional/
d elay
c t are
indep
p
T of overcurrent protection have time-delayed characteristics which are
s
a
Setting range
overcurrren on
irectional phase segregated overcurrent protection with independent time d
haracteristics. All overcurrent and directional settings apply to each phase bu
endent for each of the four stages. To arrange a single pole tripping by overcurrent
rotection, the default PSL needs to be modified.
he first two stages
electable between inverse definite minimum time (IDMT), or definite time (DT). The third
nd fourth stages have definite time characteristics only.
Menu text Default setting
Min. Max.
Step size
>1 Status
Enabled
Disabled, Enabled, Enabled VTS, Enabled
Ch Fail, En VTSorCh Fail, En VTSandCh
Fail
Setting that defines first stage overcurrent operating status. Depending of this setting, I>1
upervision (fuse fail)
(and /or) of both.
will be enabled permanently or in case of Voltage Transformer S
operation, or in case of communication channel fail, or a combination
>1 ction Fun
IEC S Inverse
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 stage overcurrent element.
>1 Directional
Non-directional
Non-directional
Directional Fwd
Directional Rev
This setting determines the direction of measurement for first stage element.
>1 Current Set 1 x n 0.08 x n 4.0 x n 0.01 x n
Pick-up setting for first stage overcurrent element.
>1 Time Delay
1 s 0 s 100 s 0.01 s
Setting for the time-delay for the definite time setting if selected for first stage element. The
setting is visible only when DT function is selected.
>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.
>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
ime Dial (T multiplier on th er to
quired tri e. The referen
curves. The T
achieve the re
D) is a
pping tim
e standard curve equation, in ord
ce curve is based on TD = 1.
Care: Certain manufacturer's use a mid-range value of TD = 5 or 7, so it may be
necessary to divide by 5 or 7 to achieve parity.
>1 Reset Char.
DT DT or Inverse N/A
Setting to determine the type of reset/release characteristic of the IEEE/US curves.
>1 tRESET
0 s 0 s 100 s 0.01 s
Setting that determines t et/release time fo ite time r characterihe res r defin eset stic.
>2 Cells as for >1
above
Setting the same as for the first stage overcurrent element.
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