SYSTEM FOR TESTING PROPERTY OF THUNDER AND LIGHTNING TRAVELING WAVE OF POWER TRANSMISSION LINE

摘要

A system for testing the property of a thunder and lightning traveling wave of a power transmission line is formed by a power transmission line thunder and lightning electromagnetic transient movable mold device and an intelligent monitoring device. On the basis of a power transmission line and lightning conductor model, a pole tower and a pole tower grounding body model and an insulator model, the pole tower is divided into a slantwise material section, a cross arm section and a main material section, and in consideration of factors of an insulator, the power transmission line and a lightning conductor, a lightning stroke transient equivalent circuit is built in a simulation manner by using corresponding wave impedance, self-impedance, mutual impedance, self-admittance, mutual admittance, inductance and the like. The intelligent monitoring device is formed by sequentially cascading a current or voltage sensor with an A/D convertor, a singlechip, and a display or an oscilloscope. An impact current is added into different positions of the system, so that signals of the lightning conductor and the conductor arranged at a far end can be measured, the propagation process of the lightning wave in the whole power transmission line can be analyzed, and an anti-thunder weak section of the power transmission line can be optimized and the lightning protection of substation equipment can be performed according to an analysis result.