25kV Composite Suspension Railway Insulator

Composite Railway Insulator

Analysis and preventive measures on insulator flashover of electrified high-speed railways-2

Measures to prevent insulator flashover

1. Divide contaminated areas and arrange cleaning reasonably

The pollution situation of the traction power supply system is quite complex. Pollution flashover prevention technology is a comprehensive technology that must be appropriately adapted to the location. It must be combined with the severity of various pollution sources, salt density testing and reference to the power system pollution area distribution map and the characteristics of electrified railways. Based on the above comprehensive techniques, we re-investigate the surrounding environment of the Beijing-Shanghai high-speed railway and conduct a comprehensive investigation of the production and living habits of industrial and mining enterprises and residents within 5 kilometers on both sides of the Beijing-Shanghai high-speed railway line. According to the production and pollution discharge situation of the enterprise, the discharged dust is collected, and the heavy pollution areas of the Beijing-Shanghai high-speed railway in the section are divided through the salt density test. At present, the cleaning of insulators in the Beijing-Shanghai high-speed railway section is mainly concentrated in March and October every year. In order to achieve the best cleaning effect, the cleaning time of key sections should be arranged within 1-2 months before the pollution flashover season. The extremely polluted sections will be cleaned at any time based on the pollution situation and salt density test results to ensure the safe operation of the high-speed rail.

2. Replace synthetic insulators and choose reasonable external insulation creepage

When synthetic insulators are exposed to pollution and moisture, their voltage levels and strengths are the same as those of porcelain insulators, but the pollution lightning voltage is 1-3 times higher than that of porcelain insulators. In severe pollution conditions, the pollution lightning voltage is still higher than its operating voltage. Therefore, synthetic insulators have extremely excellent pollution resistance. At the same time, the larger the creepage distance, the higher the insulator's resistance to pollution lightning voltage. Reasonably increasing the creepage distance of insulators in sections along the line with heavy fog, serious pollution, and frequent pollution flashovers is an effective way to increase the flashover voltage. At present, Beijing and Shanghai The creepage distance of porcelain insulators used in high-speed rail is 1400mm. It is recommended to change to a creepage distance of 1600mm, which can effectively increase the flashover voltage and prevent insulator flashover and cause tripping.

3. Apply anti-fouling flash coating

Titanium-containing antifouling flash solutions for ceramic insulators have good hydrophobicity and hydrophobic migration properties when applied on the surface of the insulator. In addition to good electrical properties, these coatings also have good antifouling properties. Their strong hydrophobicity makes water droplets Isolate each other to prevent the water film from joining together, greatly reducing the leakage current, making the surface electric field evenly distributed, and increasing the pollution lightning voltage. At the same time, the paint can also swallow up the dirty particles, making the dirty particles also hydrophobic. Therefore, as long as The paint can effectively prevent pollution flashover within its validity period.

4. Use scientific and advanced instruments for testing

⑴ Use advanced insulator salt density testing instruments to detect and analyze the insulator attachments in polluted sections at all levels on a monthly basis. Through continuous testing and laboratory analysis for 6 months, we can grasp the rules of the polluted sections. And establish a cleaning cycle.

⑵ Introduce insulator voltage distribution testing equipment to measure the voltage distribution of insulators in each polluted section once a month, and determine the cleaning cycle based on the voltage distribution of the insulators. Advanced online monitoring instruments are introduced to monitor the leakage current of insulators at all times, and feedback the subtle leakage current to the dispatching command system through wireless transmission. Through the analysis of leakage current, the cleaning cycle is determined.

⑶Introduce small, portable insulator laser detectors to measure the insulators in each polluted section once a month. The performance of the insulators can be known through scanning. If the insulation performance is found to be degraded, the work area can be arranged for replacement in time to ensure that the Beijing-Shanghai High-speed Railway Operational security.

⑷The introduction of small water flushing equipment can improve the efficiency and quality of insulation cleaning, enable the work area to complete insulation cleaning work safer, faster and better, and ensure operational safety.

⑸ On the catenary pillars of each polluted section, hang four insulators according to the angles of flat and inclined arm insulators, divided into four cycles of 1 month, 3 months, 6 months and 12 months. Each cycle Take off an insulator and conduct a high-voltage test to detect leakage current, flashover voltage, and breakdown voltage. And carry out the density detection of attached salt to determine the pollution level and cleaning cycle.

Conclusion

Flashover is a frequent accident that greatly harms the reliability of the power supply of electrified railways. In view of the current serious environmental pollution and the increase in insulator contamination, it has brought great pressure to the insulator flashover of the electrified railway contact network. In order to improve the reliability of power supply, in order to improve the reliability of the contact network, For large-scale pollution flashovers on the network, we mainly focus on strengthening insulator cleaning and shortening the cleaning cycle to reduce the incidence of pollution flashovers. Secondly, we can better prevent insulator flashovers by introducing some modern science and technology to ensure the safe operation of electrified high-speed railways. .

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