Broadband voltage transformer with resistance-capacitance parallel-serial topological units

Abstract

The invention provides a broadband voltage transformer with resistance-capacitance parallel-serial topological units. The broadband voltage transformer comprises a hollow insulator, metal flanges, fixed flanges, a resistance-capacitance voltage sharing assembly, a high-voltage arm, a low-voltage arm and a base, wherein the high-voltage arm and the low-voltage arm are arranged in the hollow insulator; the metal flanges are mounted at two ends of the hollow insulator; the fixed flanges are mounted on the inner walls of the metal flanges; two ends of the resistance-capacitance voltage sharing assembly are respectively connected with the fixed flanges; the high-voltage arm comprises a multilevel serial resistance-capacitance parallel-serial topological unit; and the low-voltage arm comprises aone-level resistance-capacitance parallel-serial topological unit. The broadband voltage transformer provided by the invention is suitable for AC systems and DC systems, and is wide in application range which specifically covers DC transmission projects, AC transmission / distribution projects, high-speed railway grids and any field and occasion with broadband voltage signal measurement needs.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a high-precision, fast-response, high-reliability, field-test-free broadband voltage transformer containing a resistance-capacity hybrid topology unit. Background technique [0002] The DC voltage transformer is an indispensable main equipment in the DC transmission system, which plays an important role in electric energy metering, power monitoring, and relay protection signal transmission. The DC voltage transformer in the prior art is composed of a resistor divider composed of a series of resistor elements connected in series. In order to prevent the resistor divider from being affected by various transient overvoltages (including lightning overvoltage), usually in the resistor A voltage equalizing capacitor is connected in parallel on the voltage divider. The specific schematic diagram of DC voltage transformer is as follows: figure 1 shown. Depending on the voltage l...

AI Technical Summary

Problems solved by technology

[0016] In order to overcome at least one of the deficiencies of low primary insulation reliability, low voltage measurement accuracy and inability to realize accurate measurement of broadband voltage signals in the above-mentioned prior art, the present invention provides a broadband voltage transformer containing a resistance-capacitance hybrid topology unit, Including hollow insulators, metal flanges, fixed flanges, resistance-capacity equalization components, high-voltage arms, low-voltage arms and bases; after the high-voltage arms and low-voltage arms are connected in series, they are set inside the hollow insulator; metal flanges are installed at both ends of the hollow insulator, and the hollow The metal flange at the top of the insulator is connected to the primary system, the metal flange at the bottom is grounded through the base, and the output end of the low-voltage arm is connected to the secondary system; the inner wall of the metal flange is equipped with a fixed flange, and the two ends of the resistance-capacity equalizing component are respectively connected to the Fixed flange connection; the high-voltage arm includes multi-stage series RC hybrid topology units, and the low-voltage arm includes a first-stage RC hybrid topology unit. The broadband voltage transformer has high primary insulation reliability and high voltage measurement accuracy, and can realize broadband Accurate measurement of voltage signals

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