2.1 operation experience of HTV silicone rubber composite insulator
At present, porcelain, glass and composite insulators account for 44.4%, 24.1% and 31.5% respectively, among which 110 (66) kV lines are used
HTV silicone rubber composite insulator accounts for 35.6% of total insulator use, 29.8% of 220 kV line, 20.6% of 500 (330) kV line
27.6% of lines, 39.6% of 500 kV lines and 65% of 1000 kV lines. The operation failure mainly occurred in 1993-2005 and 1990
The occurrence rate is 1% and 0.01% in 2006. Most of the operation faults occur in 110 (66) kV lines, followed by 220 kV and 500 kV lines. Fault cause: I
Faults (such as lightning strike, pollution flashover, wet flashover, breakdown, ice flashover, insulation strength, etc.), mechanical faults (such as brittle fracture, mechanical strength reduction, etc.), and product shortage
The fourth is wind deflection, bird damage, insufficient clearance and grounding
Damage, wildfire, external force damage, construction factors (such as improper use of equalizing device), exchange with porcelain and glass insulator, poor grounding, etc. From HTV silicone rubber
Edge rubber umbrella: the failure caused by skirt and sheath accounts for 11% of the total failure times; if the unknown flashover caused by skirt and sheath of HTV silicone rubber composite insulator is added
Faults account for 23% of the total number of faults. HTV silicone rubber composite insulator in high cold, strong ultraviolet, coastal, rainy, foggy, humid and dry climate
The area is running well.
2.2 deterioration characteristics of HTV silicone rubber composite insulator
The following deterioration characteristics of HTV silicone rubber composite insulator produced before 1998: partial discharge, corrosion, leakage, branch discharge and electricity
Trace; hardening, embrittlement, pulverization, cracking, umbrella skirt deformation; water repellency reduction; electrical strength reduction: serious dirt accumulation; mandrel exposure, joint sliding, degumming
Sew. It shows that the deterioration of silicon rubber composite insulator manufactured before 1998 is more serious, and the degree of deterioration varies in different regions. Atmospheric conditions on Composite
The influence of degradation is great.
2.3 typical operation analysis of HTV silicone rubber composite insulator
2.3.1 analysis of the operation of HTV silicon rubber composite insulator in the cold area
Heilongjiang province belongs to alpine region, with heavy wind and snow. In recent years, HTV silicone rubber composite insulator has been used in 110kV and 220kV lines
There is a small amount of use, so far, Heilongjiang Province has not occurred a failure. Operation experience shows that HT silicone rubber composite insulator is used in cold area
Good fruit. For example, Jilin Province only had one operation fault in 1999, 2001 and 2003, two of which occurred in 110kV line.
The reason of 220 kV line is bird damage and lightning strike, without mechanical and deterioration fault.
2.3.2 operation analysis of HTV silicone rubber in strong ultraviolet region
Qinghai province belongs to the area of strong ultraviolet, with large sandstorm and large temperature difference between day and night. The operation failure mainly occurred in 1998, and mostly occurred in line 1 I
Due to lightning stroke, unidentified flashover and bird droppings flashover, no failure due to product quality and deterioration has been reported.
2.3.3 operation analysis of HTV silicon rubber composite insulator in high humidity and sea salt area
Zhejiang province belongs to high humidity and sea salt pollution area. Glass insulator is mainly used in this area, and HTV silicon rubber composite insulator is relatively less. But 90
HTV silicone rubber composite insulator is used for 500 kV DC line of. One fault occurred in 1995 and 2005 respectively, and three in 1999. Accident
If the mandrel is brittle, the next is crow pecking;
2.3.4 operation analysis of HTV silicone rubber composite insulator in rainy, foggy and humid areas
Sichuan province is located in basin, rainy, foggy and humid climate. HTV silicone rubber composite insulator fault mainly occurred in 110kV and 220 in 2002
The faults are lightning and bird damage
2.3.5 operation analysis of HTV silicone rubber composite insulator in dry and rainless climate
Gansu Province is located in the northwest, with dry climate and little rain. There were more failures in 1998-2003. HTV silicon rubber composite insulator in 110-500kv line
Most of the 110kV lines are faulty. The main faults are lightning strike, bird damage and unknown flashover, and no mechanical accident has occurred.
Hebei has a dry climate with little rain and strong sandstorm. HTV silicone rubber composite insulator was used in 1992, and HTV silicone rubber was widely used in 2001
The utilization rate of 110-500kv line is 75%. Every year, there are more than one fault in 2001. The main causes of the fault are lightning, bird droppings and unidentified
2.3.6 long term operation reliability of HTV silicone rubber composite insulator
At present, the domestic operation of HTV silicone rubber composite insulator has a long record of 20 years, and the operation characteristics of HTV silicone rubber composite insulator are excellent. Also for
The life orientation of rubber composite insulator provides a basis for 15-20 years. The year provides the basis.
The operation experience shows that HTV silicone rubber platform in China operates in high humidity, strong ultraviolet, high altitude, high cold, low temperature (- 5 - + 5 ℃) and other areas
Good water property. The failures of h-silicone rubber composite insulator due to deterioration in China account for only 1.6% of the total failures, which fully shows that HTV silicone rubber composite insulator in China
The material has excellent anti deterioration property, but the structural design of composite insulator should be optimized and the manufacturing technology should be improved.