Transformer through-fault current monitor

Details Transformer through-fault current monitor Transformer through-fault current monitor

2008-10-08

2011-10-04

Patel, Dharti (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

C361S093100

Reexamination Certificate

active

08031447

ABSTRACT:
A device is provided for monitoring through-fault current in an electric transformer on an electrical power system. The device generally includes a magnitude calculator for calculating the magnitude of current (e.g., a root means square value of current or magnitude of a fundamental of current) based on the current through the electric transformer. A through-fault energy calculator is further provided which is coupled to the magnitude calculator for calculating a through-fault energy value based on the magnitude of current or the calculated current through the transformer. An accumulator is coupled to the through-fault energy calculator for accumulating a plurality of through-fault energy values, and an alarm coupled to the accumulator for indicating that the accumulated through-fault energy values exceed a selected threshold.

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