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Local discharge detecting system of sulfur hexafluoride gas-insulating and fully-enclosed combined electric apparatus

A technology for detection of sulfur hexafluoride gas and partial discharge, which is applied in the direction of testing circuits, testing dielectric strength, etc., can solve problems such as early detection, difficult positioning, and inability to detect and locate partial discharges in gas-insulated switchgear, so as to avoid Effects of interference, high difficulty in data processing, and reduction of technical requirements

Active Publication Date: 2010-02-10
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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  • Local discharge detecting system of sulfur hexafluoride gas-insulating and fully-enclosed combined electric apparatus
  • Local discharge detecting system of sulfur hexafluoride gas-insulating and fully-enclosed combined electric apparatus
  • Local discharge detecting system of sulfur hexafluoride gas-insulating and fully-enclosed combined electric apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] See Figure 1-4 , the partial discharge detection system of the SF6 gas-insulated fully-enclosed combined electrical system of the present embodiment includes: an ultra-high frequency signal receiver for being arranged on the outer edge 9 of the pot insulator 7 in the gas-insulated switchgear, for being arranged on the 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, the GPRS3 connected to the central control unit 1 A LAN 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, ...

Embodiment 2

[0034] On the basis of Embodiment 1, the partial discharge detection system of the SF6 gas-insulated fully enclosed combined electrical system of the present embodiment has the following deformations:

[0035] 16 UHF signal receivers are formed into a square array of 4×4 array elements to form a UHF receiving array, and 64 ultrasonic receivers are formed into a square array of 8×8 array elements to form an ultrasonic receiving array. The array element spacing in the receiving array is equal and is 2-5m, the array element spacing in the ultrasonic receiving array is equal and is 0.2cm, and the ultrasonic receiving array is placed in the UHF receiving array to form a planar sensor, and the ultrasonic receiving array It coincides with the center point of the UHF receiving array.

[0036] 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 reference to obtain the time ...

Embodiment 3

[0038] On the basis of Embodiments 1 and 2, the partial discharge detection system of the SF6 gas-insulated fully enclosed combined electrical system of the present embodiment has the following deformations:

[0039] 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 with an interval of d (see figure 1 ).

[0040] The array output vector can be expressed as X(t)=A(θ)S(t)+N(t), --(1)

[0041] 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;

[0042] 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 signal); S(t) is the incident signal vector; X(t) is the received signal vector; N(t) is the array noise vector. Find the covarian...

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Abstract

The invention relates to a local discharge detecting system of a sulfur hexafluoride gas-insulating and fully-enclosed combined electric apparatus. A central control unit thereof is connected with anultrahigh frequency signal receiver and an ultrasonic receiver; if the ultrahigh frequency signal and the ultrasonic wave are measured to have continuous correlation, the position of the ultrasonic receiver on the outer wall of a gas insulating switch device is moved for a plurality of times, a time difference of maximum amplitude occurring in an amplitude characteristic print of the ultrahigh frequency signal and maximum amplitude occurring in an amplitude characteristic print of the ultrasonic wave on all the detecting positions is recorded so as to calculate the distance of a discharge point and all the detecting positions; and then the position of insulation defect in the gas insulating switch device is calculated according to the overall size of the insulating 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 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 substation, the st...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R31/14
Inventor 王圣吉宏谢楠许箴
Owner CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER
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