Measuring method for high voltage feedthrough for transformer by using potential division and processing in two independent channels for RMS and peak values

摘要

A component voltage is detected and an input voltage for each phase via a capacitive high voltage divider. The input voltage is subjected to level matching and voltage limiting, a potential division is performed and the input voltage value is processed in two separate and independent channels. The first channel determines the absolute value of the input voltage and feeds it to a sample-and-hold circuit which drives a current source circuit. The output of the current source circuit has a value that is proportional to the peak value of the input voltage. The second channel rectifies the signal and uses it to drive a further current source circuit, whose output current is proportional to the RMS value of the input voltage. An independent claim is included for a measuring apparatus.