Toshiba GR 200 Series, Instruction Manual

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6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 217 -
Broken conductor protection (BCD)
A series fault or an open circuit fault can be caused by circuit breaker contact failure, the
operation of fuses, and false operation of single-phase switchgear. IEC60050 defines a series
fault as having impedances in each of three-phases that are not equal; hence, the series fault
is typified by the interruption of one or two phases, as a rule. The function of broken conductor
protection (BCD) is to detect series faults and signal a trip signal to the trip circuit.
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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 2.9-1 Comparative table in respective ordering numbers
Sec. Feature
Ordering No. at “G&T”
31 32
– Main features
✓ ✓
✓
: Applicable NA: Not applicable