ANSI05000176-2-en.vsd
3·87
ANSI05000176 V2 EN-US
Figure 59: Application of the1Ph High impedance differential protection HZPDIF (87) function on a reactor
Setting example
It is strongly recommended to use the highest tap of the CT whenever
high impedance protection is used. This helps in utilizing maximum CT
capability, minimize the secondary fault, thereby reducing the stability
voltage limit. Another factor is that during internal faults, the voltage
developed across the selected tap is limited by the non-linear resistor
1MRK 504 163-UUS A Section 7
Differential protection
Transformer protection RET670 2.2 ANSI 171
Application manual
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