Capacitive equipment partial discharge detection method based on optical fiber current sensor

Abstract

The invention discloses a capacitive equipment partial discharge detection method based on an optical fiber current sensor. The capacitive equipment partial discharge detection method based on the optical fiber current sensor mainly comprises the following steps: establishing a mathematical model of the optical fiber current sensor; designing the structure of the optical fiber current sensor; analyzing and testing the performance of the optical fiber current sensor; testing a local discharge experiment system. According to the capacitive equipment partial discharge detection method based on the optical fiber current sensor, which is disclosed by the invention, the defects of poor antijamming capability, low reliability, small applicable range and the like in the prior art can be overcome, and the advantages of good antijamming capability, high reliability and big applicable range can be realized.

Description

technical field [0001] The invention relates to the technical field of power monitoring, in particular to a method for detecting partial discharge of capacitive equipment based on an optical fiber current sensor. Background technique [0002] With the development of the national economy, the requirements for the reliable operation of the power system are getting higher and higher. Electrical equipment is the basic component of the power system. Once an accident occurs, it will not only affect adjacent equipment, but also cause heavy economic losses to users. A large amount of data shows that insulation failure is the main cause of electrical equipment failure, and partial discharge is the main cause of insulation failure. Due to partial discharge caused by insulation defects, the long-term breakdown voltage of the dielectric is often less than the short-term breakdown voltage. A fraction, therefore, partial discharge has been paid much attention as a major factor of insulat...

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Problems solved by technology

However, the internal insulation structure of power equipment is complex, and the attenuation of sound waves by various media and the impact on sound velocity are different, especially for transformers. The online detection sensitivity can only reach 500pC

[0007] Traditional partial discharge monitoring methods have their own advantages and disadvantages, which cannot be generalized. It is necessary to adopt appropriate methods for different requirements and purposes according to the specific conditions of the site.

However, because the interference in the site where the electrical equipment is located is very complex, and the partial discharge signal is very weak, it will inevitably be interfered by various noise sources on the site. Only by accurately obtaining the real partial discharge signal with a high signal-to-noise ratio can the subsequent signal processing be performed. Therefore, A sensor system with excellent performance is the basis for partial discharge monitoring and fault diagnosis

[0008] In the process of realizing the present invention, the inventor found that there are at least defects such as poor anti-interference ability, low reliability and small application range in the prior art

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