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Sulfur hexafluoride gas insulation totally-enclosed combined electric partial discharge detection and positioning system

A sulfur hexafluoride gas and partial discharge detection technology, which is applied in the direction of testing dielectric strength, etc., can solve the problems of early detection, difficult positioning, and inability to detect and locate partial discharges by gas-insulated switchgear. The effect of high processing difficulty and avoiding interference

Active Publication Date: 2010-02-17
CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the existing technology cannot detect and locate the partial discharge from the outside of the gas insulated switchgear, which makes it difficult to detect and locate the internal insulation defects in the early stage and take corresponding measures

Method used

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  • Sulfur hexafluoride gas insulation totally-enclosed combined electric partial discharge detection and positioning system
  • Sulfur hexafluoride gas insulation totally-enclosed combined electric partial discharge detection and positioning system
  • Sulfur hexafluoride gas insulation totally-enclosed combined electric partial discharge detection and positioning system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] See Figure 1-4 , the SF6 gas-insulated fully enclosed combined electrical partial discharge detection and positioning system of this embodiment includes: an ultra-high frequency signal receiver for setting the outer edge 9 of the pot insulator 7 in the gas-insulated switchgear, for setting The ultrasonic receiver on the outer wall 6 of the gas insulated switchgear, the central control unit 1, and the display 2 connected to the central control unit 1, the GPRS3 connected to the central control unit 1 for providing wireless communication, and the central control unit 1 The local area network communication unit 4 for communicating with the remote monitoring center 5. The pot insulator 7 is sleeved on the inner conductor 8 of the gas insulated switchgear.

[0023] The central control unit 1 continuously receives the ultra-high frequency signal from the ultra-high frequency signal receiver and the ultrasonic wave of the ultrasonic receiver, and judges whether there is a co...

Embodiment 2

[0034] On the basis of Embodiment 1, the SF6 gas-insulated fully enclosed combined electrical partial discharge detection and positioning system of the present embodiment has the following deformations: 16 UHF signal receivers are formed into a square array of 4x4 array elements to form an UHF In the receiving array, 64 ultrasonic receivers are formed into a square array of 8x8 array elements to form an ultrasonic receiving array. The spacing between the array elements in the UHF receiving array is equal and 2-5m, and the spacing between the array elements in the ultrasonic receiving array is equal and is 0.2m, and the ultrasonic receiving array is placed in the UHF receiving array to form a planar sensor, and the center point of the ultrasonic receiving array coincides with the UHF receiving array.

[0035] The central control unit 1 uses the partial discharge ultra-high frequency electromagnetic wave signal detected by the ultra-high frequency receiving array as a time refere...

Embodiment 3

[0037] On the basis of Embodiments 1 and 2, the SF6 gas-insulated fully enclosed combined electrical partial discharge detection and positioning system of this embodiment has the following deformations:

[0038] Consider D partial discharge narrowband signals (S 1 , S 2 ,...,S D ) is incident on a line array of the UHF receiving array, where the array is composed of M array elements, and the interval between array elements is d (see figure 1 ).

[0039] The array output vector can be expressed as X(t)=A(θ)S(t)+N(t), --(1)

[0040] Equation (1) is the mathematical model of the narrowband far-field signal, where A(θ)=[α(θ 1 ), α(θ 2 ),...,α(θ N )] is the direction matrix or array flow pattern of the array;

[0041] α(θ i ) = [1,e -j2πdSinθi / λ ,...,e -j(M-1)2πdSinθi / λ ] t , is the direction vector of the incident signal (λ is the wavelength of the incident number); S(t) is the incident signal vector; X(t) is the received signal vector; N(t) is the array noise vector. ...

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Abstract

The invention relates to a sulfur hexafluoride gas insulation totally-enclosed combined electric partial discharge detection and positioning system in order to conveniently detect and position the insulation defects of a gas insulation switch device from the outside. A central control unit is connected with an ultrahigh frequency signal receiver and an ultrasonic receiver; if a measured ultrahighfrequency signal and ultrasonic have continuous correlation, the position of the ultrasonic receiver on the external wall of the gas insulation switch device is changed for a plurality of times, and the time difference of maximum amplitude appearing in the amplitude characteristic map of ultrahigh frequency signals and maximum amplitude appearing in the amplitude characteristic map of ultrasonic on each detection position is recorded so as to calculate the distance between a discharge point and each detection position; and the position of the insulation defect in the gas insulation switch device is calculated according to the external dimension of the insulation switch device.

Description

technical field [0001] The invention relates to the technical field of safety detection of high-voltage insulation equipment in a power system, in particular to a partial discharge detection and positioning system of an SF6 gas-insulated fully enclosed combined electrical system. Background technique [0002] Gas insulated switchgear has been more and more widely used at home and abroad due to its advantages of small footprint, high reliability, little influence from external environment, strong earthquake resistance and convenient maintenance. The structure of the gas insulated switchgear is to connect power equipment such as circuit breakers, disconnectors, grounding switches, TA (current transformers), TV (voltage transformers), busbars, etc. through the metal contacts of the sealing flange and the internal conductive rod. Sealed in a closed metal cavity filled with SF6 gas at a certain pressure, due to the good insulation performance of SF6 gas, compared with the open su...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 王圣吉宏谢楠许箴
Owner CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER
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