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This paper presents a new structure of a two-stage voltage transformer (TSVT) with toroidally wound ring cores excited by low voltage for high-voltage measurement. In the new TSVT, two high-voltage windings are wound on two separate groups of toroidally wound ring cores, respectively. This avoids the insulation problem in the traditional TSVT structure for high voltage and high accuracy, in which,...
The paper presents an absolute measurement method of determining the voltage coefficient(VC) of high voltage capacitive dividers(CVD) by serial summation of voltage transformers. Under a series of double-voltages, by successively comparing a CVD with a full-insulated transformer, a semi-insulated transformer and their series, the VC of the CVD were gotten. The method was verified by using two voltage...
This paper focus on the research of a parallel-plate air capacitor, which used as the low voltage arms in capacitive voltage ratio standards for power frequency. The electrodes of this newly-developed capacitor are made of Invar Alloy and placed in parallel. It can achieve large capacitance, low voltage dependence (VC) and low dissipation. These 5 nF standard capacitors were calibrated by using the...
This paper presents a new structure of a two-stage voltage transformer(TSVT) with low voltage excitation, which can be used to design a TSVT as toroidal wound cores with high voltage and high accuracy. It just needs to wind one high voltage coil around the cores instead of two high voltage coils in the traditional TSVT with high voltage excitation, which reduces the difficulty in insulation design...
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