Toshiba GR-200 Series Instruction Manual page 629

Fault duration time
IED automatically measures and records the duration of fault occurrence (fault duration time).
Figure 8.1-1 shows the "Fault duration time" that IED can automatically measure and "Actual
fault duration time". Though the period of actual fault duration time is from fault occurrence
until fault clearance by CB opened, the period that IED can measure is only from any relay
operation by fault occurrence until the CB trip signal generation.
Fault occurrence
Current I
Voltage V
Relay operation
General trip
Trip BO contact closed
closed
CB
open
Delay time
Fault duration time
measurable by IED
Actual fault duration time
Figure 8.1-1 Fault duration time
- 610 -
6F2T0200 (0.15)
CB open
GRE200 (1,2)