Apparatus, System And Method For Measuring High Voltage On High Voltage Node

Abstract: An apparatus (20) for measuring a high voltage on a high-voltage node including a power electronic converter comprising a first AC-to-DC converter (21), a first DC-to-AC converter (22) and a second AC-to-DC converter (23), the first AC-to-DC converter being connected with a low voltage arm of a high voltage divider, which is coupled between the high voltage node and the apparatus, to obtain a voltage measurement signal, the first DC-to-AC converter being configured to output a modulated signal of the voltage measurement signal, the second AC-to-DC converter being configured to output a demodulated signal of the voltage measurement signal; a high-frequency transformer (24) comprising a primary coil connected with an output terminal end of the first DC-to-AC converter to receive the modulated signal and a secondary coil connected with an input terminal of the second AC-to-DC converter; and a controller (25) configured to provide control signals to control switching devices of the first DC-to-AC converter to control a turn-on sequence of each switching device such that the first DC-to-AC converter outputs the modulated signal, to calculate signal parameters including phase information and amplitude information of the high voltage on the high-voltage node, and to output the calculated signal parameters.

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