Toshiba GR200 Series Instruction Manual page 375

Line differential protection ied

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Another OSTV element (OSTV-2) is provided when the protection is carried out by three

IEDs. The characteristic of the OSTV-2 element is the same as the characteristic of the OSTV-

Note that to detect the state of out-of-step, phasor V B should stay at each quadrant for

the setting time (1.5 cycles). This is because that the influence of any VT transient should be

cancelled. The voltages in positive-sequence are used for the calculation of the OSTV function;

and when amplitudes are larger than 1V, the operation of the OSTV function is valid.

Figure 2.27-3 Voltage phase comparison between terminal A and terminal C (OSTV-2)

6F2S1914 (0.49)

GRL200 (Soft 033 & 037)

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