A gis partial discharge type identification system and method based on vibration signals

Abstract

The invention discloses a GIS partial discharge type identification system and a GIS partial discharge type identification method based on a vibration signal. The system comprises a vibration sensor, a data acquisition instrument and a PC, which are connected in sequence. The vibration sensor is fixedly installed on the outer shell surface of a shell body of a GIS. The vibration sensor is used for acquiring a vibration signal of the GIS in real time and transmitting the vibration signal to the data acquisition instrument. The data acquisition instrument is used for receiving the vibration signal, and transmitting the vibration signal to the PC after noise reduction, filtering and A / D conversion. The PC is used for receiving the vibration signal output by the data acquisition instruction, judging the type of discharge and outputting a judgment result. The GIS partial discharge type identification system and a GIS partial discharge type identification method based on a vibration signal provided by the invention are simple and feasible, convenient and reliable, and economic and practical.

Description

technical field [0001] The invention relates to a fault diagnosis technology for electrical equipment, in particular to a GIS partial discharge type identification system and method based on vibration signals, belonging to the field of GIS equipment state monitoring and fault diagnosis. Background technique [0002] GIS equipment, that is, Gas Insulated Metal Enclosed Switchgear (Gas Insulated Switchgear), was born in the mid-1960s. It combines circuit breakers, disconnectors, fast (grounding) switches, current transformers, voltage transformers, arresters, Three-phase or single-phase), connecting pipes and transition elements are all combined in a fully enclosed metal shell, and the medium used for insulation and arc extinguishing in the shell is 0.35-0.6MPa SF 6 gas. [0003] With the continuous maturity of technology, GIS equipment occupies an area and volume smaller and smaller, and its operation is more and more reliable. The failure rate and maintenance workload of GI...

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Problems solved by technology

GIS equipment needs to go through strict process control from design, manufacture, installation to operation to ensure the operation quality of GIS equipment, but any link in many processes may become a potential hidden danger of GIS equipment failure. According to the State Grid "High Voltage Switchgear Typical According to the case introduction in "Compilation of Fault Cases", about 80% of the faults are introduced in the manufacturing and installation process

Although GIS equipment has high operational reliability, long-term operation of GIS equipment will inevitably lead to material degradation, as well as loosening or deformation of connecting parts under the action of electrodynamic force.

There are many types of GIS equipment faults, but partial discharge faults are the most common. At present, common detection methods include UHF method, ultrasonic method, etc., among which UHF method will be affected by gas composition and electromagnetic noise in the environment Larger, the ultrasonic has defects such as low reliability and large error; therefore, finding a good discharge type identification method is of great significance for improving the reliability of power supply

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