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Extra-high-voltage equal potential shielded capacitor voltage transformer

A technology of voltage transformers and capacitive voltage dividers, applied in the direction of inductors, magnetic/electric field shielding, voltage dividers, etc., to achieve the effect of suppressing ferromagnetic resonance and improving response characteristics

Active Publication Date: 2010-09-01
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The purpose of the invention is to solve the problem of accurate measurement of the UHV (AC 1000kV and above) grid voltage in my country

Method used

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  • Extra-high-voltage equal potential shielded capacitor voltage transformer
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Embodiment Construction

[0035] The new capacitive voltage transformer of this invention is mainly composed of the following two parts: 1) a capacitive voltage divider composed of double-layer coaxial capacitor components with equipotential shielding; 2) a ferromagnetic resonance suppressor without energy storage elements Electromagnetic unit composed of intermediate transformer and other components, the shape is as follows figure 1 shown. From top to bottom, the components and their connections are as follows: Part A is the top equalizing cover, under which two parts B are connected in series, part B is a double-layer coaxial capacitor, and the bottom of the second double-layer coaxial capacitor is connected to the middle of part C The voltage equalizing electrode, and then two double-layer coaxial capacitors are connected in series to the D part electromagnetic unit, and the E part stay wire insulator that acts as a fixed support is also connected between the C part and the ground.

[0036] The dou...

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Abstract

The invention belongs to the field of power system transformer devices, and provides an extra-high-voltage capacitor voltage transformer with high precision, quick response and field validation avoidance. The extra-high-voltage capacitor voltage transformer comprises a capacitive divider with equal potential shielded double-layer coaxial capacitor assemblies and an electromagnetic unit with an energy storage element-free ferromagnetic resonance suppressor and a middle transformer, wherein the capacitive divider and the electromagnetic unit are connected in series to form the voltage transformer. The extra-high-voltage capacitor voltage transformer can meet the requirement of accurate measurement of power frequency alternating voltage of super-high-voltage to extra-high-voltage grade power grids and quick and reliable motion of relay protection. A measured main capacitor is in a good shielded state, and the capacitance can be greatly reduced, so the weight of the divider can be greatly reduced, and the shock-proof property of the thin and high divider is improved.

Description

technical field [0001] The invention belongs to the field of power system transformer devices, and in particular relates to an ultra-high voltage capacitive voltage transformer (CVT) with high precision, fast response and no on-site verification. Background technique [0002] With the engineering application of UHV (AC 1000kV and above) transmission technology in my country, the accurate measurement of UHV grid voltage has become a key technical problem to be studied and solved. The power frequency high voltage measurement devices widely used in power systems at home and abroad mainly include electromagnetic voltage transformers and capacitive voltage transformers (both of which are passive voltage measurement systems), which can basically meet the voltage requirements of 500kV and below. Metering and relay protection requirements. Photoelectric voltage transformers and electronic voltage transformers (both of which are active voltage measurement systems) are still in the p...

Claims

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Application Information

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IPC IPC(8): H01F38/24G01R15/06H05K9/00
Inventor 郑健超李志麒
Owner CHINA ELECTRIC POWER RES INST
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