DEVICE FOR ACCURACY INCREASE OF INSTRUMENT VOLTAGE TRANSFORMER

摘要

The invention relates to measurement technique and may be used for increasing accuracy of high-voltage instrument voltage transformers extensively used in power engineering. A device for accuracy increase of instrument voltage transformers comprises a first voltage transformer, to input of which measured voltage is supplied, a second voltage transformer joined up in feedback circuit of a first operational amplifier, a subtracter, to one output of which load voltage is supplied, to second output voltage from operational amplifier output. The invention provides high precession voltage value in device output both no-load transformer running and load duty running.