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Narrow-band electromagnetic wave signal coupling method and detecting system for measuring GIS partial discharge

An electromagnetic wave signal, partial discharge technology, applied in the direction of testing dielectric strength, etc., can solve the problems of weak UHF signal, inability to achieve on-site detection, low sensitivity of detection system, etc., to improve detection sensitivity, high sensitivity, and improve signal-to-noise ratio. Effect

Active Publication Date: 2014-01-01
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the radiated UHF signal is extremely weak. Using the existing external broadband antenna and detection system, due to the extremely low sensitivity of the detection system, only partial discharges of 100pC and above can be detected, which cannot meet the requirements of on-site detection.

Method used

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  • Narrow-band electromagnetic wave signal coupling method and detecting system for measuring GIS partial discharge
  • Narrow-band electromagnetic wave signal coupling method and detecting system for measuring GIS partial discharge
  • Narrow-band electromagnetic wave signal coupling method and detecting system for measuring GIS partial discharge

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Embodiment 1

[0040] A kind of narrow-band electromagnetic wave signal coupling method of measuring GIS partial discharge of the present invention, comprises the following steps:

[0041] (1) Calculate the cut-off frequency f of the electromagnetic wave main mode radiated by the pouring hole of the metal ring 18 on the GIS equipment c ; In the present embodiment, the GIS equipment is 252kVGIS produced by a certain manufacturer. The casting hole 15 on this GIS insulator 19 is approximately rectangular, see Figure 4 , according to electromagnetic wave theory, the dominant mode inside the rectangular waveguide is TE 10 Wave, the calculation formula of its cut-off frequency is:

[0042] f c = c 2 a μ r ϵ r - - - ...

Embodiment 2

[0054] The difference between this embodiment and embodiment 1 is: as Figure 5 As shown, the pouring hole 16 is a circular hole, and the cross section of the circular waveguide is circular. According to the electromagnetic wave theory, the main mode inside the circular waveguide is TE 11 wave, cutoff frequency f c The formula for calculating is:

[0055] f c = u 11 ′ c 2 πr μ r ϵ r - - - ( 2 )

[0056] Among them, c is the wave speed of electromagnetic wave in vacuum; u 11 ’ is a constant value of 1.841; r is the radius of the pouring hole; ε r , μ r are the relative permit...

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Abstract

The invention discloses a narrow-band electromagnetic wave signal coupling method and detecting system for measuring GIS partial discharge. The narrow-band electromagnetic wave signal coupling method includes the following steps that (1) the cut-off frequency fc, radiated by a poured hole in a metal ring of GIS equipment, of an electromagnetic dominant mode is calculated; (2) the cut-off frequency fc is used as the central frequency of the detecting system, and the detecting system is mainly formed by sequentially connecting a narrow-band antenna, a filter, an amplifier and a signal collector in a communicating mode; (3) the narrow-band antenna is arranged directly facing the poured hole; (4) the narrow-band antenna enables electromagnetic wave signals radiated by the poured hole to be converted into voltage signals to be transmitted to the filter, the filter conducts filtering on the voltage signals, and the voltage signals are received by the signal collector to be recoded and analyzed being amplified by the amplifier. According to the narrow-band electromagnetic wave signal coupling method, the gain within the effective narrow-band range is far higher than that of an existing broad-band detecting method. Moreover, interference signals within the broad frequency band range are avoided, and the signal to noise ratio is greatly improved. The requirements for on-site tests are completely met.

Description

technical field [0001] The invention relates to a narrow-band electromagnetic wave signal coupling method for measuring the partial discharge of GIS equipment, and also relates to a detection system using the narrow-band electromagnetic wave signal coupling method. Background technique [0002] With the continuous increase of society's demand for electricity, the power industry has developed rapidly. At present, the safe operation of large-scale transmission networks has become a major concern of the power industry. Studies have shown that insulation faults are common inside gas-insulated switchgear (GIS) and transformer equipment, and the precursor of insulation failure is often manifested as partial discharge. It is generally believed that partial discharge in high-voltage equipment seriously affects the electric field. Distribution, resulting in electric field distortion and insulation material corrosion, and finally lead to insulation breakdown. Partial discharge in GIS...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 李兴旺吕鸿卢启付王增彬陈锐民林春耀李刚易孝波
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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