Toshiba GR200 Series - 2.12 Distance carrier command protection (DISCAR)

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 185 -
Distance carrier command protection (DISCAR)
When every IED can exchange operational information mutually using communication system,
accurate decision of whether or not a fault is internal on the line can be made. Distance carrier
command protection (DISCAR) can provide such protection using the distance protection
(ZS/ZG). Consequently, the whole length of the line can be protected promptly for any fault.
The following techniques are provided in DISCAR:
1. Permissive underreach protection (PUP)
2. Permissive overreach protection (POP)
3. Unblocking overreach protection (UOP)
4. Blocking overreach protection (BOP)
The function of autoreclose (ARC) can be operated speedy using these protections above;
and these can issue either a single-pole trip signal or three-poles trip signal in accordance with
DISCAR settings and the states of faults.
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Note: 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 2.12-1 Comparative table in respective ordering numbers
feature
Ordering No. at “G&T”
33
37
DISCAR
Distance carrier command protection
✓
✓
✓: Applicable NA: Not applicable