Toshiba GR 200 Series, Instruction Manual

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6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 121 -
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: The implementation of particular features is dependent upon the selection of
hardware and the configuration of functions. Several IED models do not support certain
features. To determine whether a particular feature has been implemented within an IED,
identify the IED ordering number; and check the order number for the “G&T position” whilst
referring to the comparison table below. For more information, see
Appendix: Ordering
.
Table 2.3-1 Comparative table in respective ordering numbers
Sec. Feature
Ordering No. at “G&T”
31 32
– Main features
✓ ✓
✓
: Applicable NA: Not applicable