Toshiba GR200 Series - 2.16 Earth fault protection (EF)

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 243 -
Earth fault protection (EF)
The earth fault protection (EF) function has four stages (elements); each element can have
either a directional characteristic or non-directional characteristic.
To simplify the description, only EF1 is discussed but is applicable to the other EFs; hence,
read the expression for EF1 as EF2, EF3 and EF4 at each EF stage unless a special explanation
or instruction has been provided.
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Note: The number of relay elements depends on the IED model. To know the number in
respective IED models, locate the IED ordering number; and check the order number at “G&T
position” referring to the comparison table below. For more information, see Appendix:
Ordering .
Table 2.16-1 Comparative table in respective ordering numbers
No. of stages
Ordering No. at “G&T”
33
37
Non-directional/directional definite time EF protection
4
✓
✓
✓: Applicable NA: Not applicable