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3·Id
IEC05000176-3-en.vsd
IEC05000176 V3 EN-US
Figure 37: Application of the1Ph High impedance differential protection HZPDIF 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 but in the unused taps, owing
to auto-transformer action, voltages much higher than design limits might be
induced.
Section 6
1MRK 505 343-UEN B
Differential protection
104
Application manual
Summary of Contents for Relion 670 series
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