The lightning protection effect evaluation of Lightning Arrester is an important part of ensuring the safe operation of power systems and various equipment. The following aspects can be used to evaluate the lightning protection effect of Lightning Arrester.
Technical parameter evaluation
1. Nominal discharge current: This is a measure of the tolerance of Lightning Arrester under lightning impulse current of specified waveform. A larger nominal discharge current means that Lightning Arrester can withstand lightning impulses of greater energy and has a relatively better lightning protection effect.
2. Residual voltage: When Lightning Arrester discharges lightning current, the voltage generated at both ends is called residual voltage. The lower the residual voltage, the less insulation pressure on the protected equipment, and the better the lightning protection effect. The performance of different Lightning Arrester can be evaluated by comparing the residual voltage values under the same lightning impulse current.
Actual operation data evaluation
1. Lightning accident statistics: Observe the number of lightning strikes in the area where Lightning Arrester is installed over a period of time and the damage to the protected equipment. If the number of lightning strikes is significantly reduced and the protected equipment is not damaged after the lightning strike, it means that the lightning protection effect of Lightning Arrester is good. On the contrary, if the protected equipment still fails frequently after the lightning strike, it may be necessary to re-evaluate the performance or installation method of Lightning Arrester.
2. Recording the number of Lightning Arrester actions: Lightning Arrester will act when it is struck by lightning. Recording the number of Lightning Arrester actions can indirectly reflect the intensity of lightning activity in the area and the working status of Lightning Arrester. If the number of Lightning Arrester actions is reasonable and consistent with the local lightning activity, it means that Lightning Arrester is functioning normally.
Simulation test evaluation
1. Laboratory impact test: Lightning Arrester is tested by simulating lightning impact in the laboratory. By measuring the response time, residual voltage, leakage current and other parameters of Lightning Arrester, its performance under different lightning impact conditions is evaluated. This method can more accurately evaluate the lightning protection effect of Lightning Arrester, but there may be some differences from the actual operating environment.
2. On-site simulation test: Conduct simulated lightning strike tests at the actual installation site to be closer to the actual operation. Equipment such as impulse current generators can be used to generate simulated lightning strikes to observe the action of Lightning Arrester and the protection effect on the protected equipment.
Comprehensive evaluation is conducted based on technical parameters, actual operation data and simulation test results. At the same time, factors such as the installation quality, grounding conditions, and coordination with the protected equipment of Lightning Arrester are considered. If the technical parameters of Lightning Arrester meet the requirements, perform well in actual operation, and can effectively protect the protected equipment in simulation tests, then it can be considered that the lightning protection effect of Lightning Arrester is good.
In short, the lightning protection effect evaluation of Lightning Arrester needs to comprehensively consider multiple factors. Through technical parameter analysis, actual operation data statistics and simulation tests, the performance of Lightning Arrester is comprehensively evaluated to ensure that it can effectively protect the power system and various equipment from the impact of lightning disasters.
