By hvhipot 
[Keywords] Zero value insulator, insulator distribution voltage measurement table, insulator tester
Insulators installed on transmission lines may experience insulation resistance reduction, cracking, and even breakdown during operation due to long-term exposure to mechanical and electrical loads, sun and rain, and changes in temperature, posing potential threats to power supply reliability. Therefore, online detection of insulators is of great significance.
The aging of insulators on high-voltage transmission lines directly threatens the safe operation of the power system. Aging insulators, especially zero value insulators, are not only prone to overheating and expansion, leading to cracking of the insulator head and causing wire breakage accidents, but also have low flashover voltage, which reduces the insulation level of high-voltage lines.
Zero value insulator refers to an insulator whose potential distribution at both ends of the insulator is close to or equal to zero during operation. The influence of zero or low value insulators (the insulation resistance of low and zero value insulators is generally 0 M Ω~300 M Ω): The insulation of line conductors depends on the insulator string. Due to manufacturing defects or external effects, the insulation performance of insulators will continuously deteriorate. When the insulation resistance decreases or reaches zero, it is called a low or zero value insulator. They have a significant impact on the operation of power lines. According to incomplete statistics, the proportion of zero or low value insulators in suspended porcelain insulators during power line operation is about 0.3%.
Therefore, the “Regulations for Testing Deteriorated Disc shaped Suspension Insulators” stipulate that there are five testing methods for insulators, namely 1. measuring voltage distribution; 2. Measure insulation resistance; 3. Power frequency withstand voltage test; 4. Inspection; 5. Mechanical strength test. Among them, the two most important detection methods are “measuring voltage distribution” and “measuring insulation resistance”.
The insulator distribution voltage measuring table developed and produced by HV Hipot Electric Co., Ltd. fully meets the verification regulations and can measure voltage distribution. This device is mainly used for measuring insulator strings on 35KV to 500KV AC transmission towers. By measuring the voltage distribution value, degraded insulators can be detected, which can reduce power system accidents and improve the safety guarantee of power supply lines.
The insulator tester developed and produced by HV Hipot Electric Co., Ltd. fully meets the verification regulations and can measure insulation resistance. This equipment is mainly used for 35-500KV power lines (series connection), insulation resistance distribution (detecting insulation resistance in power outage conditions). In order to determine the insulation level of the insulator.