Toshiba GR200 Series Instruction Manual page 256

Line differential protection ied

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Signal of OC trip

When a user requires an alarm signal in place of the trip signal; for example, set Alarm

for the scheme switch [OC1-UseFor]. Trip is set for the scheme switch [OC1-UseFor] for

the normal trip operation.

Scheme logic

The scheme logic for both the non-directional and the directional OC1 element is illustrated in

Figure 2.15-8; Figure 2.15-9 shows grouping commands for the trip circuit (TRC). Each phase

of the OC1 element issues a pick-up when a current has been exceeded over the setting; then

the pick-up signal is transferred to into the TRC as trip signals. (For more information, see

Relay application: Trip circuit function

For DT characteristic

For IDMT characteristic

800001EBB0 OC1_BLOCK

800001EBB4 OC1_INST_OP

†Note: The presence of 'OC1-OR' and 'OC1PU-OR' signals depends on the operation

characteristic defined with setting [OC1_Timer], as shown in Table 2.15-7.

Table 2.15-7 Signal behaviors of PLC monitoring points 'OC1-OR' and 'OC1PU-OR'

PLC monitoring points

A pick-up signal is generated instantly when the element operates.

Figure 2.15-8 Scheme logic for the OC1

IEC-NT,VI,EI, UK-LTI, IEET-MI,VI,EI, US-CO2,CO8, ORIGINAL

0.00–300.00s

Setting [OC1_Timer]

6F2S1914 (0.49)

GRL200 (Soft 033 & 037)

To Grouping logic

OC1-OPT-TRIP

OC1-OPT-ALARM

OC1-ARC-BLOCK

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