Toshiba GR200 Series Instruction Manual page 161

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Directional earth fault command protection (DEFCAR)

Directional earth fault command protection (DEFCAR) provides POP, UOP and BOP

techniques† using two elements of earth fault protection between in forward and in reverse

(DEFCF and DEFCR‡). POP, UOP and BOP can issue either a single-pole trip (1P) or three-

phase trip (3P). These can also enable to run the function of autoreclose (ARC). User can select

either first tripping or delayed tripping in DEFCAR with set of delay timer. Thus, it is possible

to give priority to the function of distance carrier protection (DISCAR) so that DISCAR runs

faster than DEFCAR. DEFCAR send a trip block signal for the opposite terminal when one or

two poles in CB are open and when the failure of voltage transformer occurs.

†Note: When both DISCAR and DEFCAR are used mutually for the command protection,

user should coordinate the technique between DISCAR and DEFCAR. For the

selection of the techniques in DEFCAR, see section 2.3.

‡Note: In DEFCAR, EF1 is used for a forward element (DEFCF); EF2 is used for a

reverse element (DEFCR). Both EF1 and EF2 are the function of earth fault

protection (EF). For more information, see Chapter

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Several IED models do not have carrier features. To determine whether the features

are implemented in the IED or not, 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 2.4-1 Comparative table in respective ordering numbers

✓: Applicable

Main features

NA: Not applicable

Relay application: Earth fault

Ordering No. at "G&T"

6F2S1915 (0.46)

GRZ200 (Soft 031 & 032)