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RFL Electronics RFL 9300 - Page 93

RFL Electronics RFL 9300
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RFL 9300 RFL Electronics Inc.
August 25, 2000 3 - 24 (973) 334-3100
Extensive simulator testing has shown that transformer in-rush is not as severe as a low-side fault. Therefore,
9300 settings that are secure for low-side faults will also be secure for transformer in-rush
3.14.3 CONCLUSION
If the tap transformer blocks the flow of zero-sequence, and the minimum internal phase fault current is at least
three times the magnitude of the maximum external phase fault current, the RFL 9300 may be applied. This
requires elevated phase bias settings, and possible resistor changes in the RFL 9300's ACT (auxiliary current
transformer) circuits.

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