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Method and apparatus for detecting and compensating measurement errors due to transformer saturation in a meter
Method and apparatus for detecting and compensating measurement errors due to transformer saturation in a meter
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机译:用于检测和补偿由于电表中的变压器饱和而导致的测量误差的方法和设备
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摘要
A current measurement circuit includes an integrator, first and second transformers, and a current measurement unit. The first transformer includes a first winding about a magnetic core. The magnetic core has an opening through which a current to be measured passes. The first winding is configured to generate a first current based on a first flux in the magnetic core. The second transformer includes second and third windings. The second winding is coupled to receive the first current from the first winding. The second winding has a terminal coupled to the third winding. The third winding is coupled to a first input of the integrator circuit. The output of the integrator circuit is operably coupled to provide an error current to the second transformer. The current measurement unit measures the current through the second winding of the second transformer.
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