Affiliations: [a] State Grid Fujian Electric Power Co., Ltd., Fuzhou, Fujian, China | [b] Wuhan Efficiency Evaluation Co., Ltd., State Grid Electric Power Research Institute, Wuhan, Hubei, China | [c] NARI Group Co., Ltd., State Grid Electric Power Research Institute Co., Ltd., Nanjing, Jiangsu, China
Correspondence:
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Corresponding author: Kaibin Wu, Wuhan Efficiency Evaluation Co., Ltd., State Grid Electric Power Research Institute, Wuhan, Hubei 430074, China. E-mail: [email protected].
Abstract: For the power transmission tower shared equipment, there are strong current wireless interference and complex grounding environment, which leads to problems such as unstable operation of the shared equipment. Based on the multi-grade surge protector and new grounding technology, through the impulse experiments, we apply simulated lightning current generated from combined wave generator (1.2/50 μs, 8/20 μs) on the modle, and an oscilloscope is used to collect residual voltage and current data to calculate the absorbed energy of the grounding unit. It is concluded that when the impulse voltage is between 300 V and 3500 V, as the impulse voltage increases, after passing through the multi-grade surge protector and grounding unit, the residual voltage and current value continue to increase, and the residual voltage value is 23.4 V–29.6 V increases linearly, and the increase is small; the internal resistance of the grounding unit decreases with the increase of the impulse voltage. The energy absorbed by the grounding unit is positively correlated with the impulse voltage and negatively correlated with the internal resistance, and its energy absorption percentage decays linearly. The multi-grade surge protector can effectively clamp the residual voltage value within a safe value, and its discharge effect is better than that of the traditional protection mode. It provides a theoretical basis and data reference for the lightning protection and anti-interference projects of the actual transmission tower sharing equipment, and has certain practical value.
Keywords: The power transmission tower shared equipment, the multi-grade surge protector, new grounding technology, lightning current, energy absorbed
