Monitoring method of lightning intrusion switch room based on current distribution of ground network

Abstract

The invention proposes a lightning intrusion switch room monitoring method based on the current distribution of the ground grid, which is characterized in that: the current on the busbar arrester, the busbar PT, the grounding transformer, the common bus grounding line of the primary equipment, and the secondary side of the busbar PT are collected respectively. voltage to judge the source of lightning intrusion and its impact on primary and secondary equipment. It can effectively monitor the area where lightning strikes occur and whether lightning waves intrude into the switch room.

Description

technical field [0001] The invention relates to the field of power system operation and maintenance management, in particular to a lightning intrusion switch room monitoring method based on ground grid current distribution. Background technique [0002] With the continuous development of society, the power system has been widely used in industrial production and daily life. Electric energy has become the main energy and power for modern industrial production. Ensuring high-quality and stable power supply is one of the priorities of power companies. However, in lightning-prone areas, large-scale power outages caused by lightning strikes in substations often occur. The large-scale power outages caused by lightning strikes not only cause inconvenience to users, but also often cause damage to 10-35 kV switch cabinets in substations. Serious losses. Therefore, it is urgent to study the intrusion of lightning into substations. [0003] The main ways of lightning intrusion into t...

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Problems solved by technology

The main discharge of a lightning strike is generally tens of thousands to hundreds of thousands of amps, which will generate instantaneous high heat and electromotive force; 2) The potential of the ground grid will rise after the direct lightning current flows into the ground, resulting in a large difference in the potential of each branch line, resulting in different Damage to electronic equipment on other positions, and lightning strikes

3) The energy of direct lightning discharge radiates to the surroundings through electromagnetic induction and electrostatic induction, resulting in overvoltage of equipment and ground network, and induced lightning overvoltage

[0004] However, under the existing lightning protection measures, 10-35 kV equipment is still the hardest-hit area for lightning intrusion. Most of the existing research on lightning intrusion switch rooms stays at the level of theory and qualitative analysis. This is because the 10-35 kV switch The existing indoor monitoring methods cannot effectively monitor the lightning intrusion.

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