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Dry capacitor type voltage transformer

A technology of voltage transformers and capacitive voltage dividers, applied in the direction of inductors, voltage dividers, transformers, etc., can solve the problems of high cost, leakage, environmental pollution, etc., reduce the plate area and field strength, and avoid leakage Leakage, to avoid the effect of ferroresonance

Inactive Publication Date: 2004-06-30
王日新
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing capacitive voltage transformers on the market, the capacitive voltage divider is packaged in a vertical insulating cylinder, and insulating oil or insulating gas is injected into the insulating cylinder; this structure makes it inevitable that the capacitive voltage transformer will cause Leakage, environmental pollution; In addition, the cost of maintenance is also high

Method used

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  • Dry capacitor type voltage transformer
  • Dry capacitor type voltage transformer
  • Dry capacitor type voltage transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Use the polytetrafluoroethylene plate as the solid insulating plate 6 in the capacitor element, which has a circular groove in the middle, and its shape is round; the electrode plate 5 is a circular plate, embedded in the groove of the solid insulating plate 6, and slightly It is higher than the groove surface; the capacitive elements made by the above method are stacked one by one to form a capacitive voltage divider, and put into the insulating sleeve 7 made of epoxy resin, the inner wall of the insulating sleeve 7 is closely matched with the solid insulating plate 6, The gaps are filled with silicone gel. There is a spring 4 between the pressure equalizing cover 2 and the uppermost electrode plate 5 , and each capacitive element is pressed by the spring 4 . The pressure equalizing cover 2 is tightly and hermetically connected with the insulating sleeve 7 . The high voltage connection terminal 1 is connected above the pressure equalizing cover 2 . The uppermost elec...

Embodiment 2

[0025] The insulating sleeve 7 is made of polytetrafluoroethylene; the circuit board device 12 used for voltage signal conversion and amplification processing is not installed and fixed in the housing 9, but is placed in the control room by extending the shielded connection line; other structures are the same as in the first embodiment.

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Abstract

The invention relates to dry type capacitor voltage transformer utilized in AC high voltage power system and DC electrical power system with 110KV and higher voltage. The transformer comprises capacitor voltage divider utilized in circuit board for signal conversion and amplification treatment. The capacitor voltage divider in insulating sleeve comprises two pieces of cascaded capacitive components. Umbrella skirt covers the insulating sleeve. Based on need, voltage signal is picked out from a plate electrode in middle of the cascaded capacitive components. The said signal through the circuit board for signal conversion and amplification treatment is output to measuring and displaying device and protecting device. Advantages of the invention are dry type, free of maintenance, high insulating strength and small volume.

Description

technical field [0001] The invention belongs to the measurement and protection equipment in the power system, in particular to a voltage transformer used in the AC high-voltage power system including 110KV and above and the DC power system. Background technique [0002] At present, the voltage transformers used in the AC high-voltage power system with a voltage level of 110KV and above are divided into two types. One is an electromagnetic voltage transformer, which is easy to excite ferromagnetic resonance, and has poor reliability and high cost during operation; the other is a capacitive voltage transformer, whose working principle is to reflect the high voltage through the tap voltage value of a capacitor voltage divider. The voltage value at the terminal; the tap is connected to the electromagnetic device, and the electromagnetic device is composed of an intermediate transformer, a compensation reactor and a ferromagnetic resonance control circuit; the secondary winding o...

Claims

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Application Information

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IPC IPC(8): G01R15/06H01F38/24
Inventor 王日新
Owner 王日新
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