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A method of suppressing high-frequency conduction interference inside gis

A technology of conduction interference and high frequency, applied in the field of power transmission and distribution, can solve the problems of eliminating high-frequency conduction interference in substations that are not applicable to GIS, and achieve the effect of preventing refusal or misoperation and eliminating hazards

Inactive Publication Date: 2016-10-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The EMI filter is a low-pass filter composed of inductors and capacitors, which can pass low-frequency signals smoothly and effectively suppress high-frequency interference signals. However, the existing EMI filters are not suitable for GIS substations. Eliminate high-frequency conduction interference generated by VFTO

Method used

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  • A method of suppressing high-frequency conduction interference inside gis
  • A method of suppressing high-frequency conduction interference inside gis
  • A method of suppressing high-frequency conduction interference inside gis

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Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] The method for suppressing the high-frequency conduction interference inside the GIS of the present invention is to connect an EMI filter on the line between the outlet side of the voltage transformer of the GIS substation and the inlet of the secondary equipment.

[0024] The concrete structure of the EMI filter circuit that the present invention adopts is as image 3 shown. The first matching impedance Z 01 , the first matching impedance Z 02 , the first common mode capacitor C Y1 , the second common mode capacitor C Y2 , the first differential mode capacitance C X1 , the second differential mode capacitance C X2 and the common mode inductance L C , Differential mode inductance L D .

[0025] The first matching impedance Z 01 and the first matching impedance Z 02 The series branch formed is connected to the phase l...

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Abstract

Provided is a method for inhibiting high-frequency transduction interference in a GIS. An EMI filter is connected onto a line between the outlet side of a GIS transformer substation voltage transformer and a secondary device inlet and comprises two matching impedors, two common-mode capacitors, two differential-mode capacitors, a common-mode inductor and a differential-mode inductor. A series branch formed by the two matching impedors is connected to the LN line outlet end of the voltage transformer, and series connection points of the matching impedors are grounded. The differential-mode capacitors are connected in parallel and respectively connected between a phase line and a central line. The common-mode inductor and the differential-mode inductor are connected to a line between the differential-mode capacitors in series. The two common-mode capacitors are respectively connected between a phase line at the rear end of the differential-mode inductor and the ground and between the central line and the ground. By means of the method, high-frequency transduction interference produced by VFTO in a GIS transformer substation can be effectively filtered, and a rejection or maloperation phenomenon of a secondary device can be prevented.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a method for suppressing high-frequency conduction interference inside a GIS. Background technique [0002] Gas Insulated Substation (GIS for short), also known as fully enclosed combined electrical equipment, has many advantages such as small footprint, safe operation, convenient maintenance, and isolation from the surrounding environment. Therefore, the application of gas insulated substations is becoming more and more widespread all over the world, especially in distribution substations in metropolitan cities. A large number of gas-insulated substations have been put into operation in various provinces and cities in my country in recent years. Like any new technology, its use brings new problems. During the closing process of the isolating switch and the circuit breaker in the GIS, due to the repeated breakdown of the switch contact fracture, a ve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02B7/01H02B1/24
Inventor 张重远高黎明李春燕朱瑞敏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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