Testing of current transformers

Details Testing of current transformers Testing of current transformers

2006-04-18

2006-04-18

Nguyen, Vinh (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

C324S547000

Reexamination Certificate

active

07030602

ABSTRACT:
A method for evaluating the accuracy of a current transformer is presented. The current transformer has a primary winding and a secondary winding. A current is not circulated through the primary winding. A load is disconnected from the current transformer. A load impedance is measured of an internal instrumentation associated with the current transformer. The resistance in the secondary winding of the current transformer is determined. The load impedance is compared to a standard burden. A standard burden value is selected. The secondary voltage for a rated current is determined. The injection voltage is adjusted to the value of the secondary voltage. The exciting current and power are measured. The ratio error or the phase angle are then calculated by using the exciting current and power.

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patent: 4758774 (1988-07-01), Crawford et al.
patent: 4857856 (1989-08-01), Coleman et al.
patent: 6680616 (2004-01-01), Khalin et al.
patent: 2004/0130329 (2004-07-01), Suss et al.

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