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Grading ring for limiting transient voltage and current of capacitor voltage transformer

A voltage transformer and transient voltage technology, applied in the field of voltage equalizing rings, can solve problems such as threats to CVT safe operation, achieve simple structure, increase damping effect, and ensure safe operation

Active Publication Date: 2014-08-06
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If a CVT is installed near the isolating switch breakout, as attached figure 2 As shown, the isolating switch is suitable for the small capacitor to generate fast transient voltage and current, which will act on the CVT and pose a threat to the safe operation of the CVT

Method used

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  • Grading ring for limiting transient voltage and current of capacitor voltage transformer
  • Grading ring for limiting transient voltage and current of capacitor voltage transformer
  • Grading ring for limiting transient voltage and current of capacitor voltage transformer

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Embodiment 1

[0028] Such as Figure 1-5 As shown, the inventive voltage equalizing ring of this example is a voltage equalizing ring used for transient voltage and current protection of a capacitive voltage transformer. The voltage equalizing ring includes the voltage equalizing ring that forms the equalizing ring and is connected to the equalizing ring shaft. An insulating frame composed of insulating rods arranged in parallel; the pressure equalizing ring is connected by open rings with different diameters to form a cage.

[0029] Each of the open rings is connected end to end with each other through a resistor or a metal wire.

[0030] The open ring is a metal ring and spirally winds the insulating frame from one end to the other end of the insulating frame.

[0031] The upper end of the equalizing ring is connected to an overhead line, and the lower end is connected to the top end of the capacitive voltage transformer.

[0032] The number of open loops is determined according to the requireme...

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PUM

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Abstract

The invention relates to a grading ring for limiting the transient voltage and current of a capacitor voltage transformer. The grading ring is used for transient voltage and current protection of the capacitor voltage transformer; the grading ring comprises an insulation framework, is formed by insulating rods, the insulating rod is parallel to the axial direction of the grading ring, and the grading ring is formed by connecting opening circular rings with different diameters. The functions of the grading ring are achieved, the function of protecting inductors is achieved, an original grading ring is replaced, and extra space is not needed.

Description

Technical field: [0001] The invention relates to a voltage equalizing ring, and more particularly to a spiral voltage equalizing ring for limiting the transient voltage and current of a capacitive voltage transformer. Background technique: [0002] Capacitive voltage transformer (CVT) is a substation equipment used for high voltage measurement. It converts the high voltage of the substation into a low voltage according to a certain transformation ratio relationship to meet the needs of the voltage input signal of the measurement, control and protection system of the substation . The working principle of CVT is that it includes two-stage voltage conversion, the first-stage voltage conversion is performed by a capacitor voltage divider, and the second-stage conversion is performed on the output signal of the capacitor voltage divider by a transformer. From the perspective of the substation, CVT is a capacitor. [0003] In substations, switch or isolating switch operation can genera...

Claims

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Application Information

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IPC IPC(8): G01R15/06
Inventor 刘卫东班连庚项祖涛韩彬关永刚马其燕黄瑜珑高文胜
Owner STATE GRID CORP OF CHINA