Transformer fault protection device

Details Transformer fault protection device Transformer fault protection device

H - Electricity

01

F

H01F 27/40 (2006.01) H02H 7/04 (2006.01) H02H 7/045 (2006.01) H02H 1/00 (2006.01)

Patent

CA 2057482

A transformer ground fault protector is provided and includes sensing means to be positioned adjacent but spaced from the output of each secondary winding in a transformer having its secondary windings connected in series and at the midpoint of the series circuit to ground. The sensing means forms a capacitive circuit with the windings and generates an output voltage when the secondary windings are energized. The output voltages generated by the sensing means are combined which in normal operation of the transformer, results in a voltage having a magnitude substantially equal to zero volts. However, when a fault occurs in the transformer, the output voltages induced in the sensing means are unequal and opposite in polarity resulting in a voltage having an absolute value greater than zero when combined. The resultant voltage in turn is conveyed to a comparator which compares the magnitude of the resultant voltage with a predetermined threshold voltage. When the resultant voltage is greater than the predetermined threshold voltage, the comparator provides a positive output voltage which is used to bias a switch connected in series with the transformer primary winding to an open condition thereby to isolate the primary winding from its power supply. An LED is illuminated when the primary winding is isolated from the power supply to provide a visual indication of the transformer fault condition.

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