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Detection method for partial discharge through intelligent sensor

A technology of intelligent sensors and detection methods, which is applied in the direction of radio wave measurement systems, instruments, and measuring electronics. Accuracy and stability, the effect of reducing positioning errors

Inactive Publication Date: 2018-02-02
STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST +1
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Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of the existing partial discharge positioning method, such as large installation and maintenance workload, high requirements on hardware and software, high price, and easy to cause large errors, and propose a partial discharge intelligent sensor detection method

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  • Detection method for partial discharge through intelligent sensor

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Embodiment Construction

[0029] The traditional positioning method based on the signal amplitude strength is realized based on the ranging method. According to the signal transmission theory, the strength of the radio signal decreases with the increase of the distance, and the model to quantify this attenuation mainly includes the Shadowing model:

[0030] P r (d)=P r (d 0 )-10nlg(d / d 0 )+X σ (1)

[0031] In the formula, Pr(d) is the signal strength at distance d from the signal source; Pr(d 0 ) is the distance from the signal source d 0 The signal strength at , as a reference; n is the attenuation coefficient, its value is affected by the environment; X σ is a Gaussian random variable with mean 0 and standard deviation σ.

[0032] According to the Shadowing model, theoretically, the distance between the signal source and the receiver can be obtained by measuring the signal strength. For example, there are now 3 receiving sensors whose coordinates are known to be (x 1 ,y 1 ,z 1 ), (x 2 ,...

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Abstract

The invention discloses a detection method for partial discharge through an intelligent sensor, so as to iron out the defect of partial discharge happening in an operation process of high-voltage power equipment. A wireless sensing network based on a signal amplitude and intensity distribution positioning algorithm is constructed, and can be used for a power equipment partial discharge online detection system in various occasions. The system mainly comprises a UHF (ultrahigh frequency) intelligent sensor, the wireless sensing network and a portable data analysis unit. The whole power equipmentsystem can employ a plurality of intelligent sensors which are used for detecting electromagnetic signals generated by partial discharge. The plurality of intelligent sensors form an intelligent network through the wireless technology, and the data transmission and sharing is achieved through a wireless network. The fusion processing and analysis of the UHF electromagnetic signals obtained by theplurality of intelligent sensors is carried out through combining with a novel amplitude and intensity positioning method and employing a data analysis unit, and a defect positioning and diagnosis result is given. The method is suitable for the fault diagnosis of high-voltage equipment.

Description

technical field [0001] The invention relates to high-voltage equipment fault detection, in particular to a partial discharge intelligent sensor detection method. Background technique [0002] Insulation deterioration is one of the important causes of substation device failures. The main causes of this type of failure are poor contact, burrs, and impurities inside. Due to the existence of such faults, partial discharge will occur after the equipment is put into operation, and then the insulation will be further degraded. After a vicious cycle, it is easy to cause insulation breakdown and cause greater accidents. Therefore, the localization of partial discharge location is very important for the safe operation of power equipment. However, the traditional partial discharge monitoring system needs to lay signal transmission lines, and the installation and maintenance workload is heavy, which increases the complexity of the system and the workload of on-site testing. In practic...

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Application Information

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IPC IPC(8): G01R31/12G01S5/02
CPCG01R31/1227G01S5/02
Inventor 张朋张德文朱学成高自伟张洪达郭跃男陈世玉曲利民梁建权
Owner STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST
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