Toshiba GR-200 Series Instruction Manual page 22

the SOTF will have the protection for a certain period after the circuit breaker closes.
[CBF] Circuit breaker failure protection
The CBF is provided to clear the fault when an original circuit-breaker fails to operate.
[UC] Under-current protection
The UC has two relay elements.
[OCN] Negative-sequence phase over-current protection
The OCN is used to monitor negative phase sequence currents. Its characteristic is similar to
that of OC characteristic.
[THM] Thermal overload protection
The THM can generate an alert signal upon occurrence of the thermal overload conditions.
[CLP] Cold load protection
The CLP can provide the user another setting group, which differs from the normal setting
group, for a period after energizing the system.
[BCD] Broken conductor protection
The BCD operates for series faults or open circuit faults, fault types accompanied neither by
earth faults nor by phase faults. Broken conductors, circuit breaker contact failure, operation
of fuses, or false operation of single-phase switchgear can result in the operation of the BCD.
[OV] Phase over-voltage protection
The OV has two pick-up stages for phase over-voltage. The stages can be characterized either
an inverse time or a definite time. The sensitivity of drop-off voltage and pick-up voltage is
programmable by ratio settings.
[OVS] Phase-to-phase over-voltage protection
The OVS has two stages for phase-to-phase over-voltage. The stages can be characterized
either an inverse time or a definite time. The sensitivity of drop-off voltage and pick-up voltage
is programmable by ratio settings.
[OVG] Zero-sequence phase over-voltage protection
The OVG operates for a voltage of zero phase sequence.
[OVN] Negative-sequence over-voltage protection
The OVN operates for a voltage of negative phase-sequence.
[UV] Under-voltage protection
The UV provides two relay elements. The sensitivity of drop-off voltage and pick-up voltage is
programmable by ratio settings.
[UVS] Phase-to-phase under-voltage protection
The UVS provides two relay elements; the sensitivity of drop-off voltage and pick-up voltage is
programmable by ratio settings.
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6F2T0200 (0.15)
GRE200 (1,2)