Zinc oxide arrester on-line monitoring system

Abstract

The invention relates to a zinc oxide arrestor on-line monitoring system which comprises a microprocessor which is respectively connected with an A / D converting unit, a lightning stroke counting module and a GPRS communication module; the A / D converting unit is respectively connected with a leakage current sampling module and a voltage sampling module; the structure of the microprocessor comprisesinput / output interfaces, a counter and a serial communication interface; the input / output interfaces are connected with the A / D converting unit; the counter is connected with the lightning stroke counting module; the microprocessor is connected with the GPRS communication module; the microprocessor adopts a FPGA chip EPIC6Q240C8. The monitoring system dynamically monitors the insulating propertyof the zinc oxide arrestor under the operating voltage; the test results are accurate and reliable; the testing process is simple; and the test period is short; the zinc oxide arrestor on-line monitoring system is not easy to be affected by artificial and external factors, can provide long term data information of operation and performance deterioration of the zinc oxide arrestor, and has better practical value.

Description

technical field [0001] The invention belongs to the technical field of electrical performance monitoring, and relates to an online monitoring system for the insulation performance of an arrester, in particular to an online monitoring system for a zinc oxide arrester. Background technique [0002] Surge arrester is one of the important protection devices to ensure the safe operation of the power system, mainly used to limit the lightning overvoltage transmitted from the line or the internal overvoltage caused by operation. [0003] Because of its outstanding advantages in lightning protection performance, silicon carbide arresters are widely used in high-voltage equipment in power systems, but they have the following disadvantages: First, they only have the maximum lightning amplitude voltage limiting protection function, and there is no lightning steep wave protection function. The protection function is incomplete; the second is that there is no continuous lightning impact ...

AI Technical Summary

Problems solved by technology

[0003] Because of its outstanding advantages in lightning protection performance, silicon carbide arresters are widely used in high-voltage equipment in power systems, but they have the following disadvantages: First, they only have the maximum lightning amplitude voltage limiting protection function, and there is no lightning steep wave protection function. The protection function is incomplete; the second is that there is no continuous lightning impact protection capability; the third is that the stability of the operating characteristics is poor, and it may suffer from transient overvoltage hazards; the fourth is that the operating load is heavy and the service life is short, etc.

[0006] 1) A power outage is required during the test: even a planned power outage will have a certain impact on production

After a power outage, the temperature of the equipment drops, and the test results often cannot reflect the real situation

Studies have shown that about 58.5% of the equipment is difficult to make correct judgments based on low temperature test results

[0007] 2) Early report or false report: The test voltage applied by regular power outage maintenance is generally 10KV and below, which is lower than the voltage during the operation of the arrester, and due to the power outage during the test, the reflected situation is quite different from the actual situation, and the operation cannot be reflected in real time The insulation performance and working condition of the arrester under high voltage, so the diagnostic results may not conform to the actual operating state. There have been many preventive tests that have passed the preventive test, but the arrester has burned out and exploded.

[0008] 3) High maintenance cost: The material resources, financial resources and manpower invested during the preventive test are relatively large, the test procedure is complicated, the workload is heavy, the time is concentrated, and the test results are easily affected by human factors

[0009] 4) The test cycle is long, and some faults that develop rapidly cannot be discovered and diagnosed in time

However, under the operating voltage of the electrical equipment under test, the characteristic quantity of electrical abnormal information is very weak, the range of change is large, and it is susceptible to on-site electromagnetic interference, which makes the collection, transmission, processing and diagnosis of the abnormal information much more complicated than the monitoring of power system operating parameters. , resulting in a slow development of dynamic monitoring of the working status of electrical equipment

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