Toshiba GR-200 Series Instruction Manual page 295

Multi functional protection ied

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Detection of current change (OCD)

Current change detection relay

Suppose that the difference exists between the latest current phasor (I

). The OCD function can operate if the difference is larger than setting [OCD]. The

can be measured for the last two-cycles; the difference is decided using Equation (2.24-1):

where the decision criteria is given by pick-up threshold value (I s ).

The pick-up threshold is set using the setting [OCD].

Figure 2.24-5 shows the OCD logic and its output signals.

Figure 2.24-5 Current change check relay logic

Figure 2.24-4 Current change detection

6F2T0200 (0.15)

) and the last current

To Common, DEFCAR

GRE200 (1,2)

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