Local discharge electroacoustic united detection positioning system and positioning method thereof

Abstract

The invention relates to a local discharge electroacoustic united detection positioning system and a positioning method thereof in the technical field of electric power systems. The local discharge electroacoustic united detection positioning system comprises a plurality of sensing and amplifying modules, a front end detection module and an industrial control module, wherein the sensing and amplifying modules are arranged on a GIS casing cavity body to be tested and are connected with the front end detection module for outputting amplifying signals, the front end detection module carries out synchronous signal collection on a plurality of paths of input amplifying signals and outputs the amplifying signals to the industrial control module, and the industrial control module outputs a control command to the front end detection module. The invention concentrates the advantages of an ultrahigh frequency detection method and an ultrasonic detection method, discovers the defects of insulation matching and the like possibly existing in the installation process of the GIS in time, enhances the acceptance check accuracy and ensures the safe and reliable power supply of an electric power system.

Description

Technical field [0001] The invention relates to a method in the technical field of power equipment, in particular to a combined gas-insulated switch partial discharge acoustic and electric joint detection and positioning system and a positioning method used in an on-site acceptance mode. Background technique [0002] Partial discharge detection is an important means to monitor the insulation status of large power equipment. Many scholars have done in-depth research in this area in recent years. According to the international survey report of the CIGRE23.10 working group, the insulation failure accounted for 60% of the 562 failures of the GIS input before 1985, and the insulation failure accounted for 51% of the 247 failures of the GIS input after 1985. The consequences of insulation breakdown It is more serious, so it has attracted attention from home and abroad. According to the statistics of my country's power system high-voltage switch accident analysis report in 2002, the f...

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Problems solved by technology

[0009] 4. Chemical monitoring method: determine the severity of partial discharge by analyzing the content of gas products caused by partial discharge in GIS, but the adsorbent and desiccant in GIS may affect the measurement of chemical method; the circuit breaker is normally opened The gas products produced by the arc generated during the time will also have an impact; the decomposition products produced by the pulse discharge will be diluted by a large amount of SF6 gas, so the sensitivity of the chemical method is very poor in terms of partial discharge monitoring; in addition, this method cannot To be used as a method of long-term monitoring;

[0010] 5. Optical monitoring method: The photomultiplier can monitor even the emission of a photon, but because the ray is strongly absorbed by SF6 gas and glass, there is a "dead angle". This method is more effective for monitoring the position of the known discharge source. But it does not have the ability to locate the fault

[0012] monitor method coupling capacitance method UHF method Ultrasonic method chemical method optical method advantage simple; less sensitive high High sensitivity; can for running prepare High sensitivity; anti-electromagnetic Strong interference ability immune to electromagnetic interference free from electromagnetic interference disturb shortcoming The operating device cannot use; low signal-to-noise ratio high cost complex structure; demanding Operated by experienced people poor sensitivity; no long-term monitoring Poor sensitivity; Multiple sensors are required device precision 5pC 0.5~0.8pC <2pC very poor discharge source immobilized particles; suspended objects; air gaps and cracks various defect types apply to both free-moving particles; suspended matter serious discharge when the defect immobilized particles; Needles Fault location cannot Higher precision: ? .1m Applicable, but under strict conditions , requires multiple sensors can only judge which gas cell discharge cannot Fault type can can can cannot cannot application early adoption application application rarely used rarely used

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