Toshiba GR-200-5 Instruction Manual

Also see for GR 200 Series: Instruction manual Instruction manual Instruction manual Instruction manual Instruction manual

6F2T0207 (0.01)GRE200 (5,6)- 139 -2.12.5 Operation timingThe OCCBF and EFCBF elements can check that the target CB has opened normally and thatthe fault current has disappeared completely. Because load current is usually present, theOCCBF and EFCBF settings should be account for between 10% and 200% of the rated current.The time settings [TCBF-RE] and [TCBF-TP] are determined in relation to the openingtime of the target CB and the reset time of the OCCBF or EFCBF elements (see Toc and Tcbin Figure 2.12-1). The following description illustrates a setting calculation example when “re-trip” is used:Setting of TCBF-RE =Breaker opening time + OCCBF/EFCBF reset time + Margin=40ms + 10ms + 20ms=70msSetting of TCBF-TP =TCBF-RE + Output relay operating time + Breaker opening time +OCCBF/EFCBF reset time + Margin=70ms + 10ms + 40ms + 10ms + 10ms=140ms