The voltage withstand capability of Lightning Arrester is one of the important indicators to measure its performance, which is crucial to ensure the safe operation of electrical systems.
First of all, the voltage withstand capability of Lightning Arrester can be preliminarily measured by its rated voltage. The rated voltage refers to the maximum working voltage that Lightning Arrester can withstand for a long time. Generally speaking, the rated voltage of Lightning Arrester should be higher than the rated voltage of the protected electrical equipment to ensure that Lightning Arrester will not be damaged due to excessive voltage under normal working conditions. For example, for an electrical system with a rated voltage of 380V, choosing a Lightning Arrester with a rated voltage of 420V can provide a certain safety margin. However, the rated voltage is only a basic reference indicator and cannot fully represent the actual voltage withstand capability of Lightning Arrester.
Secondly, the impulse withstand voltage is another important parameter to measure the voltage withstand capability of Lightning Arrester. During the operation of the electrical system, it may be affected by instantaneous high voltages such as lightning impulse and operating overvoltage. Lightning Arrester needs to be able to withstand the impact of these instantaneous high voltages without damage and limit the overvoltage within a safe range. Impulse withstand voltage is usually expressed by the residual voltage under lightning impulse current and operating impulse current. The lower the residual voltage, the stronger the impulse withstand voltage capability of the Lightning Arrester. For example, in areas with frequent lightning activities, it is necessary to select a Lightning Arrester with a higher impulse withstand voltage capability to ensure that electrical equipment can be effectively protected when struck by lightning.
Furthermore, the withstand voltage capability of the Lightning Arrester is also affected by its structure and materials. High-quality Lightning Arrester usually adopts advanced materials and reasonable structural design to improve its withstand voltage performance. For example, some Lightning Arrester use nonlinear resistance materials such as zinc oxide, which have good volt-ampere characteristics, can be quickly turned on under high voltage, and limit overvoltage to a safe range. At the same time, reasonable structural design can enhance the heat dissipation performance of the Lightning Arrester and improve its ability to withstand long-term working voltage.
Finally, in order to accurately measure the withstand voltage capability of the Lightning Arrester, strict testing and certification are required. Professional testing agencies will conduct various withstand voltage tests on the Lightning Arrester according to relevant standards, including power frequency withstand voltage test, impulse withstand voltage test, etc. Only Lightning Arrester that has passed these tests and obtained corresponding certification can ensure its pressure resistance and reliability in practical applications. In short, the pressure resistance of Lightning Arrester can be measured by multiple aspects such as rated voltage, impulse withstand voltage, structural materials, and test certification. When selecting and using Lightning Arrester, these factors should be considered comprehensively to ensure the safe operation of the electrical system.
