Toshiba GR200 Series Instruction Manual page 308

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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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Several IED models do not have broken conductor protection feature. 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

Table 2.19-1 Comparative table in respective ordering numbers

Broken conductor protection

✓: Applicable

Appendix: Ordering

NA: Not applicable

6F2S1914 (0.49)

Ordering No. at "G&T"

GRL200 (Soft 033 & 037)

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