Substation overvoltage monitoring system and method based on wireless acquisition technology

Abstract

The invention belongs to the technical field of electric automatization and especially relates to a substation overvoltage monitoring system and method based on wireless acquisition technology. The system comprises two portions: a test probe portion and a receiving probe portion. Through an AD converter circuit, an analog signal is allowed to be converted into a digital signal stably, and through high-speed analog acquisition in ARM, a good record of detail portions of an original signal is made; stable sampling of an analog sampling circuit is realized; a good energy saving effect is achieved; the system can prevent influence of high-voltage electric field parameter changes, and has good static and dynamic performance; wireless detection of test results is realized, thereby preventing tedious coaxial cable wiring on test sites and preventing the latent possibility of personal electric shock due to wired test of high-voltage equipment; test data is accurate and reliable; an original hardware transformation link of the overvoltage signal is simplified, and flexibility of the whole machine is improved; and the device can be widely produced as a product, and is highly profitable.

Description

technical field [0001] The invention belongs to the technical field of electrical automation, and in particular relates to a substation overvoltage monitoring system and method based on wireless acquisition technology. Background technique [0002] According to the research on power system and its operation and maintenance experience, the insulation performance and overvoltage tolerance level of each link of the power grid play a key role in the healthy operation of the power grid. Once overvoltage occurs, it will cause deterioration of electrical insulation characteristics, and cause grid accidents in severe cases. Therefore, it is necessary to monitor and study the overvoltage of the power system, guide the accident analysis according to the test results, and provide a reasonable basis for further improving the insulation level. At present, the widely used method is to test the overvoltage through the end screen of the bushing, use an external voltage sensor and a capacit...

AI Technical Summary

Problems solved by technology

At present, the widely used method is to test the overvoltage through the end screen of the bushing, use an external voltage sensor and a capacitive device in series, divide the original overvoltage, and test the attenuated overvoltage, which can well reflect The original waveform, but the fault recorder samples the signal through the coaxial cable. The coaxial cable needs to be matched with an external impedance. The wiring process is cumbersome. Once the capacitive equipment is not well grounded, high voltage signals will be connected to the oscilloscope, threatening the tester's life. Safety

At the same time, when the cable acquisition is used, the original voltage waveform is attenuated on the long-distance cable, resulting in waveform distortion

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