Active current transformer

Details Active current transformer Active current transformer

1989-03-03

1990-10-30

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

324126, 324 99R, 324117R, 323355, 323356, 323357, G01R 1900, G01R 1502

Patent

active

049671456

ABSTRACT:
An active current transformer has a primary conductor in which a current is to be measured and a secondary conductor in which a measuring current is generated in use. A feedback sensor provides an induced voltage and an amplifier receives a signal induced in the feedback sensor and generates the measuring current in the secondary conductor. The primary and secondary conductors are located in first and second magnetic circuits respectively, the first and second circuits having a common path over at least a part of their respective lengths. The feedback sensor is disposed on the common path of the first and second magnetic circuits so that, in use, the magnetic flux in the second path can be made substantially equal to that in the first path by operation of the amplifier in response to the voltage in the feedback sensor.

REFERENCES:
patent: 2779908 (1957-01-01), Martin
patent: 3714545 (1973-01-01), Chiffert
patent: 3815013 (1974-06-01), Milkovic
patent: 3881149 (1975-04-01), Kilo
patent: 4626778 (1986-12-01), Friedl

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