Digital Phase Open & Reverse Phase & UnderVoltage Relay (GDR-JD01) User's Manual V1.10
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Kyongbo Electronics Co., Ltd.
3.
Protection Characteristics
3.1 Phase Open Function
This relay contains the Definite Time characteristic to be used for Phase Open
protection.
It operated to 1 or 2phase voltage less than 80% rated voltage or, angle chaged over
range based on rated voltage.
Logic Diagram for Phase Open element operation is as follows.
【
Figure 3.1
】
POR Logic Diagram