Online monitoring method for built-in lightning arrester through Hall sensor

Abstract

The invention provides an online monitoring method for a built-in lightning arrester through a Hall sensor. The method comprises the following steps: acquiring heat dissipation data of a valve plate in the lightning arrester and current data flowing through the valve plate; based on the heat dissipation data and the current data, obtaining the heat balance characteristic of the valve plate; and determining the service life of the lightning arrester based on the heat dissipation data, the current data or the heat balance characteristic, and judging the health state of the lightning arrester inoperation. According to the online monitoring method for the built-in lightning arrester, the temperature data and the leakage current data of the lightning arrester are collected and processed, and the temperature data and the leakage current data are sent to a single-chip microcomputer control circuit to be calculated and processed; and finally, the temperature data, the leakage current data andthe analysis result of the service life of the lightning arrester are transmitted to a BC26 wireless transmission module or a wired transmission module; data is checked through a mobile terminal or aremote server; and based on the data, the operation data of the lightning arrester can be monitored in real time, the operation health state of the lightning arrester is judged, and the fault of thelightning arrester is predicted as soon as possible.

Description

Technical field [0001] The invention relates to the field of lightning arrester monitoring, in particular to a built-in method for online arrester monitoring through Hall sensors. Background technique [0002] A lightning arrester is an electrical appliance used to protect various electrical equipment in the power system from damage caused by lightning overvoltage, operating overvoltage, and power frequency transient overvoltage. The main types of lightning arresters include protective gaps, valve arresters and metal oxide (MOA) arresters. Through the role of parallel discharge gap or nonlinear resistance, the intrusion flowing wave is clipped, and the amplitude of the overvoltage to the protected equipment is reduced. Lightning arresters can be used to protect against atmospheric overvoltages as well as operating overvoltages. [0003] In recent years, MOA arresters have excellent protection characteristics, large current capacity, simple internal structure, light weight, and lo...

AI Technical Summary

Problems solved by technology

[0004] (1) Since the MOA valve of the MOA arrester is under the action of the grid voltage, there must be a leakage current flowing through the MOA valve, and the active component in the current will heat the valve and cause a change in the volt-ampere characteristics of the MOA valve. This is a In the process of positive feedback, the result of long-term action will lead to the aging of the MOA valve until thermal breakdown occurs

[0005] (2) The MOA surge arrester is affected by the impact voltage, and the MOA valve will also age under the action of the impact voltage energy

[0006] (3) Moisture inside the MOA arrester or poor insulation performance of the internal insulation bracket will increase the power frequency current, increase power consumption, and cause internal discharge in severe cases

[0007] (4) MOA arresters are often polluted by rain, snow, condensation and dust. Due to the difference in internal and external potentials of MOA arresters, there is a large potential difference between the internal MOA valve and the external porcelain sleeve, resulting in radial discharge. , may damage the arrester in severe cases

Once the MOA valve plate fails, it will cause damage or even explode. At the same time, other electrical equipment will lose overvoltage protection, which will affect the safe operation of the power system. Therefore, it is imperative to realize effective and real-time state detection of MOA arresters and judge their health status. OK

[0009] The performance of the MOA arrester directly affects the safe operation of the power system. In the actual operation of the MOA arrester, after internal aging and moisture, the resistive current will increase significantly, making the temperature of the MOA valve rise. Once there is an overvoltage in the system It will cause thermal collapse of the MOA arrester, and even the explosion of the arrester, so that the arrester loses its protective effect

[0010] It is not enough for the MOA surge arrester to rely on a pre-test once a year to find its aging. Even if the MOA arrester is qualified in the pre-test, breakdown damage may occur during operation, and the protection characteristics will decline, which will have extremely serious consequences. For To ensure the safe operation of the MOA arrester, it is necessary to monitor the operating status of the arrester online

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