Intelligent detection method and detection system device for contaminated insulator

Abstract

The invention discloses an intelligent detection method and a detection system device for a contaminated insulator and belongs to the technical field of contaminated insulator performance detection of a high-voltage transmission line. The method comprises the following steps of: hanging the detected contaminated insulator in an artificial fog room; adjusting a test power supply device so that a test program is adjusted to a working state; when an ultrasonic fog generator of the artificial fog room is started to fog to a saturated damping state, continuously increasing test voltage until the detected contaminated insulator is in a flashover state; acquiring the flashover voltage value by a data acquiring card; sending the flashover voltage value to an expert system, comparing the flashover voltage value with historical data in the expert system, and analyzing the data; and judging whether the detected contaminated insulator is safe or not. By the method and the device, the problems of poor accuracy of the test data and high investment of insulator string pollution flashover voltage test equipment in the prior art are solved, the external insulating level and the reliability of safe running of an insulator string are accurately judged, the probability of pollution flashover accidents is effectively reduced, and enormous indirect economic benefit is brought.

Description

technical field [0001] The invention belongs to the technical field of performance detection of polluted insulators of high-voltage transmission lines, and in particular relates to a polluted insulation intelligent detection method and a detection system device with simple structure, convenient transportation, convenient operation, practicality and reliability. Background technique [0002] At present, there are mainly the following methods to evaluate the pollution degree of transmission line insulators: 1) Equivalent salt-attached density method: it is the main method used in the power grid at present, and there is no direct relationship between this method and the pollution flashover voltage, so it is impossible to evaluate pollution External insulation performance of insulators; 2) Contaminated layer conductivity method: it is the result of the combined action of insulator contamination and moisture. The test equipment used in this method is complicated, and it is difficu...

AI Technical Summary

Problems solved by technology

[0002] At present, there are mainly the following methods to evaluate the pollution degree of transmission line insulators: 1) Equivalent salt-attached density method: it is the main method used in the power grid at present, and there is no direct relationship between this method and the pollution flashover voltage, so it is impossible to evaluate pollution External insulation performance of insulators; 2) Contaminated layer conductivity method: it is the result of the combined action of insulator contamination and moisture. The test equipment used in this method is complicated, and it is difficult to control saturation and humidity on site. Currently, it is mostly used in laboratory tests; 3) Leakage Current method: It is a comprehensive reflection of the three factors of voltage, humidity, and pollution. It has high requirements for instruments and a long recording time. The measurement data requires very professional personnel to judge and apply

For example, long-term drought leads to intensified pollution of insulators, and in case of sudden foggy weather, the leakage current suddenly increases and causes pollution flashover; 4) Flashover field strength: the flashover field strength is the most reasonable as a characteristic quantity. It may take several years to draw a conclusion. At the same time, the measurement of pollution flashover voltage and pollution flashover gradient requires a large capacity of test equipment, which is inconvenient and requires professional technicians to operate and evaluate; 5) Daily sedimentation density of pollution: the The measurement method is relatively simple and intuitive, but it can reflect the limited degree of pollution; 6) The conductivity of the dirty liquid: this method is simple to measure, but the dirty liquid with a certain conductivity can produce different degrees of pollution on the insulator, so it is difficult to directly explain The severity of insulator pollution; 7) Salt concentration: This method is simple and easy to implement, but it does not consider the influence of voltage, and is generally used in artificial pollution experiments or to measure the insulation level of salt-polluted areas; 8) The conductivity of 1% sewage concentration Rate method: This method only indicates the conductivity of the pollutant at this concentration, and explains the nature of the pollution, but cannot reflect the severity of the pollution deposited on the surface of the insulator, and has no direct relationship with the pollution flashover process of the insulator; 9) Air quality index: This method takes into account the insoluble pollutants in polluted areas, but the evaluation standard of this method is the corresponding annual average value, and the evaluation standards in different regions are inconsistent, so a large amount of measurement and analysis work is required to establish evaluation standards in various regions; 10) Saturated salt Density method: Saturated salt density is similar to equivalent salt density method, and the test period is longer

From the above, it can be seen that the current insulator pollution degree detection methods are not satisfactory, and there is no unified characteristic quantity that can accurately evaluate the operating state of polluted insulators. The effects of various characteristic quantities are different from each other and need further research.

Images