Improved ultrahigh-frequency partial discharge capacity detection and acquisition device and improved ultrahigh-frequency partial discharge capacity detection and acquisition method

Abstract

The application relates to an improved ultrahigh-frequency partial discharge capacity detection and acquisition device and an improved ultrahigh-frequency partial discharge capacity detection and acquisition method. The device comprises an antenna sensor, a filter circuit, an amplifier circuit, comparators, an FPGA, and D/A conversion circuits. The signal output end of the antenna sensor is connected with the filter circuit and the amplifier circuit in turn and then connected to the reverse input ends of the multiple comparators, the forward input ends of the multiple comparators are respectively connected with the output ends of the multiple D/A conversion circuits, the input ends of the D/A conversion circuits are connected with the data input end of the FPGA, and the reference phase signal input pin of the FPGA is connected with an external power-frequency reference phase wave generation device. The method comprises the steps of pulse acquisition, comparison level input, pulse comparison and storage, and variation value comparison and storage. According to the invention, to-be-detected equipment can be detected, whether there are partial discharge pulses and the number of overrun pulses can be known in real time, and more accurate approximate amplitude of partial discharge pulses can be obtained through the operation of software.

Description

technical field [0001] The application belongs to the field of high-voltage equipment insulation monitoring, and specifically relates to an improved ultra-high frequency partial discharge detection and collection method, and also relates to an improved ultra-high frequency partial discharge detection and collection device. Background technique [0002] Partial discharge is a partial discharge process that occurs within or on the surface of a solid insulation without penetrating the electrodes. In the early stage of insulation deterioration of electrical equipment, partial discharge often exists, and partial discharge will further accelerate the deterioration of insulation. Although the partial discharge is only a partial breakdown of the insulation, each discharge will cause slight damage to the insulation. The reasons for the damage are: the local temperature of the medium rises and the oxidation accelerates, which reduces the electrical and mechanical properties of the me...

AI Technical Summary

Problems solved by technology

[0006] The current UHF signal acquisition method generally collects the entire waveform of the partial discharge signal, and then performs analysis and calculation, but requires expensive signal acquisition equipment

The frequency range measured by the UHF method is 300MHz-3GHz, which requires the A / D converter of the equipment to have a very high frequency, the signal transmission is centralized, and a large amount of high-speed storage is required, which makes the whole equipment expensive; the equipment processes a large amount of data when it is running. , the processing time is long, which affects the next step of detection; it requires fixed installation, which is not easy to carry; the device works outdoors for a long time, and is affected by the atmospheric environment such as temperature and humidity, which will also cause deviations in the measurement data

[0007] The UHF partial discharge monitoring and acquisition method and device proposed earlier can make up for the shortcomings of conventional UHF acquisition, and has the advantages of using fewer components and higher measurement accuracy. It is also easy to implement and has good flexibility. However, there is only one comparator for processing the collected signal, and the processing speed is very slow. For example, to achieve the highest precision signal processing with 8-bit D / A, it needs to compare at least 255 power frequency cycles (about 5s), and the partial discharge signal has certain randomness. , the partial discharge signal may have a relatively large change within 5 seconds

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