Toshiba GR200 Series Instruction Manual page 384

Line differential protection ied

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Multi-level overcurrent elements (OCMFS)

Characteristic of OCMFS

A current fluctuates when there is a condition about out of step, so the function of multi-level

overcurrent elements (OCMFS) is provided in the FS function. That function includes seven

detectors placed at seven multiple levels.

Figure 2.29-2 illustrates that that OCMFS includes those current level detectors (LDs).

Table 2.29-2 shows a detector threshold between operating and resetting is fixed in each LD.

LD element starts operating if the current exceeds its operating threshold, and the LD will

reset its operation when the current is below 80% of the operating threshold.

Figure 2.29-2 OCMF characteristics

D.O./P.U.=0.8

6F2S1914 (0.49)

GRL200 (Soft 033 & 037)

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