Spray control method used for insulator string rainfall test

Abstract

The invention discloses a spray control method used for an insulator string rainfall test. A rainfall apparatus is arranged in a manual simulation climate chamber (10). A water supply device is used to provide a water source for the rainfall apparatus. The rainfall apparatus is used for implementing simulation rainfall for an extra-high voltage insulator string to be tested in the manual simulation climate chamber. In the rainfall apparatus, a support is vertically installed. A nozzle group (96) arranged on the support is used for implementing water spray for the extra-high voltage insulator string. Heights of different nozzles relative to a support bottom are different. Sodium chloride is mixed into the water source of the water supply device so as to change a conductivity of spray water. The spray control method used for the insulator string rainfall test adopts a vertical-type spray apparatus so that a nature rainfall environment can be effectively simulated.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and relates to a spray control method for insulator string rain tests. The system can be used to perform artificial simulated rain test on insulator strings with voltage levels of AC 1000kV, DC ±1000kV and below. Background technique [0002] At present, my country's UHV transmission lines are booming and have become one of the main directions for the development of my country's power grid. Due to the large transmission capacity and long transmission distance, the transmission lines cross mountains and lakes, and are extremely vulnerable to lightning strikes, icing, and rainstorms. threats of natural disasters. UHV insulator strings are an important part of UHV transmission lines for suspension and insulation, and their external insulation properties are inevitably affected by the above natural disasters. In recent years, universities and scientific research institutions in the fie...

AI Technical Summary

Problems solved by technology

For the test characteristics of UHV insulator strings in the rain environment, due to the complexity of the simulated rain test system and the difficulty of achieving uniform rainfall, no systematic research has been carried out at home and abroad.

Few research institutions only use municipal tap water to conduct flashover discharge tests on low-voltage grade insulator strings in the rain environment in artificial climate chambers or field test stations. Because the conductivity of rainwater and the size of water droplets in the above-mentioned rain tests cannot be adjusted and uniform Poor performance, resulting in large differences between the test results and the actual situation in the natural environment

Some researchers in China also proposed to build an artificial rain laboratory for UHV insulator strings, which is specially used to study the external insulation characteristics of UHV insulator strings in the rain environment. However, after the project budget was estimated, it was found that the cost was huge and the construction period was long

On-site UHV transmission line operation and maintenance experience shows that flashover discharge faults of insulator strings caused by rain occur from time to time and show an increasing trend. , uniformity and many other factors, and there are significant differences in the rain flashover characteristics of UHV insulator strings and low voltage insulator strings

[0003] The invention patent with the publication number 104330656A discloses a simulated rain test system (application number: 201410542203.3), the core of which is to design a canopy for spraying water to simulate the rain on the insulator strings on the pole tower of the high-voltage transmission line The test simulates the electrification test of insulators in foggy and rainy days. However, the nozzle of this system is facing downwards, and the spray angle cannot be adjusted, so it cannot simulate the environment with mixed wind and rain. Therefore, the energy for simulating various rain effects is weak and cannot be used. Adapt to higher simulation test requirements

[0004] In addition, the utility model patent with publication number 203551688U discloses a simulation system for the operating environment of composite insulators in high-altitude areas (application number: 201320638456.1), which is used to simulate rain and fog in high-altitude areas. However, this patent only provides an idea , did not provide detailed implementation details, such as how to arrange the nozzles, how to support them, etc., because there is still a large distance from the implementation of specific applications

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