Areva MiCOM P441, Technical Manual

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P44x/EN AP/E33 Application Notes
Page 82/220 MiCOM P441/P442 & P444
2.17 Directional and non-directional earth fault protection
Three elements of earth fault protection are available, as follows:
•
IN> element - Channel aided directional earth fault protection;
•
IN>1 element - Directional or non-directional protection, definite time
(DT) or IDMT time-delayed.
•
IN>2 element - Directional or non-directional, DT delayed.
The IN> element may only be used as part of a channel-aided scheme, and is fully described
in the Aided DEF section of the Application Notes which follow.
The IN>1 and IN>2 backup elements always trip three pole, and have an optional timer hold
facility on reset, as per the phase fault elements. (The IN> element can be selected to trip
single and/or three pole). All Earth Fault overcurrent elements operate from a residual
current quantity which is derived internally from the summation of the three phase currents.
The following table shows the relay menu for the Earth Fault protection, including the
available setting ranges and factory defaults.
Menu text Default setting Setting range Step size
Min Max
GROUP 1
EARTH FAULT O/C
IN>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
IN>1 Directional Directional Fwd Non-Directional, Directional Fwd,
Directional Rev
IN>1 VTS Block Non directional Block or Non directional
IN>1 Current Set 0.2 x In 0.08 x In 4.0 x In 0.01 x In
IN>1 Time Delay 1s 0 200s 0.01s
IN>1 Time Delay VTS 0.2s 0 200s 0.01s
IN>1 TMS 1 0.025 1.2 0.025
IN>1 Time Dial 7 0.5 15 0.1
IN>1 Reset Char DT DT or Inverse
IN>1 tRESET 0 0 100s 0.01s
IN>2 Status Enabled Disabled or Enabled
IN>2 Directional Non Directional Non-Directional, Directional Fwd,
Directional Rev
IN>2 VTS Block Non directional Block or Non directional
IN>2 Current Set 0.3 x In 0.08 x In 32 x In 0.01 x In
IN>2 Time Delay 2s 0 200s 0.01s
IN>2 Time Delay VTS 2s 0 200s 0.01s
IN> DIRECTIONAL
IN> Char Angle –45° –95° 95° 1°
Polarisation Zero Sequence Zero Sequence or Negative Sequence