A 1000kv Column Capacitive Voltage Transformer

Abstract

The invention provides a 1000kV column type capacitive voltage transformer. The 1000kV column type capacitive voltage transformer includes a capacitive voltage divider and an electromagnetic unit which are connected with each other; the capacitive voltage divider includes coupling capacitors which are connected in series sequentially; the coupling capacitor comprises an outer porcelain bushing, capacitor flanges coaxially arranged at the outer sides of two ends of the outer porcelain bushing, as well as a capacitor component and an expander coaxially arranged at the inner sides of the two ends of the outer porcelain bushing, wherein the capacitor component and the expander at the two ends of the outer porcelain bushing are respectively connected with the capacitor flanges at the two ends of the outer porcelain bushing; a damping device is connected in series between the capacitor component and the expander; and the damping device includes a damping resistor. With the above technical schemes of the invention adopted, high-frequency voltage and current which are applied onto the capacitive voltage divider of the 1000kV column type capacitive voltage transformer can be effectively inhibited, and the insulating performance of the 1000kV column type capacitive voltage transformer can be improved.

Description

technical field [0001] The invention relates to a voltage transformer, in particular to a 1000KV column capacitive voltage transformer with a damping device connected in series in the capacitor. Background technique [0002] The column capacitive voltage transformer is divided into two parts: capacitive voltage divider and electromagnetic unit, such as figure 1 Shown; The capacitive voltage divider consists of a single or multiple coupling capacitors, which bear the primary voltage of the system. Each coupling capacitor is composed of multiple capacitor units in series, such as figure 2 shown. [0003] The capacitive voltage divider of 1000kV column capacitive voltage transformer is usually stacked by five coupling capacitors, each coupling capacitor has dozens to hundreds of capacitive elements inside, and each capacitive element has two plug-in leads The capacitive elements are crimped and connected in series through the lead sheets. [0004] With so many components a...

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Problems solved by technology

[0004] With so many components and connection points, the 1000kV column capacitive voltage transformer is prone to lightning overvoltage and operating overvoltage when it is running in the UHV grid (for example, when the isolation switch in the power system is operated, high-frequency voltage will and current) and other overvoltage violations, accompanied by high-frequency voltage, high-frequency current flows inside the column-type capacitive voltage transformer, under the action of electricity, heat and force generated by high-frequency voltage and current, The Insulation Performance of Capacitive Elements in 1000kV Column Capacitive Voltage Transformer Is Easily Damaged

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