Partial discharge work frequency synchronization signal sensing device

Abstract

The invention provides a partial discharge work frequency synchronization signal sensing device which mainly solves the problems that existing work frequency synchronization signals are not easy to operate on field and poor in safety, and extraction of the work frequency synchronization signals needs access of a high pressure secondary circuit. The partial discharge work frequency synchronization signal sensing device comprises a sensor, an overvoltage protection circuit, a primary amplifying circuit, a narrow-band filtering frequency-selecting circuit, an automatic gain control circuit, a secondary amplifying circuit and a power conversion module. The whole partial discharge work frequency synchronization signal sensing device is fixed at a position outside a high-pressure device or line safe distance, and is used for obtaining work frequency signals, inputting the work frequency signals to the overvoltage protection circuit and other devices, filtering out high-frequency components, and carrying out frequency-selecting and gain controllable amplification on the signals through the primary amplifying circuit, the narrow-band filtering frequency-selecting circuit, the automatic gain control circuit and the secondary amplifying circuit in sequence. The partial discharge work frequency synchronization signal sensing device is capable of breaking away from the mains supply, and has the advantages of being safe, high in receiving sensitivity, small in phase errors with the work frequency signals, simple in operation, and capable of being used for providing reliable and stable synchronous trigger signals for partial discharge signal collection.

Description

technical field [0001] The invention belongs to the field of high-voltage insulation fault on-line detection and data collection and processing, and in particular relates to a non-contact partial discharge power frequency synchronization signal sensing device, which can be used in a high-voltage and ultra-high-voltage power system partial discharge detection system to provide a synchronous trigger signal. Background technique [0002] In the high-voltage power system, due to the inevitable defects in the manufacturing process, transportation, and assembly process, such as the introduction of dust or conductive particles in the equipment, metal tips and holes in the equipment, etc., it is easy to cause various forms of partial discharge in the power system , to a certain extent, it is easy to cause insulation breakdown, cause the power system to fail, and cause huge losses to the national economy. Therefore, the accurate measurement and location of partial discharge phenomena ...

AI Technical Summary

Problems solved by technology

[0005] The three kinds of partial discharge detection equipment introduced above use contact-type power frequency synchronous signal sensing devices, but they all need to be directly connected to the power supply to extract power frequency signals, so they cannot exist without the mains power supply, so in the field of ultra-high voltage equipment The requirements for safety issues are prominent, especially when using partial discharge portable detection equipment, the synchronization signal is not easy to obtain

Therefore, in the process of partial discharge data collection, the operation is complicated and the requirements for the external environment are high.

Images