Overhead ground wire configuration method of power distribution network and overhead ground wire

Abstract

The invention discloses an overhead ground wire configuration method of a power distribution network. The method comprises the steps of arranging a main overhead ground wire above a target power distribution line area; determining an easily-hit road section of the target distribution line area, wherein the easy-to-strike road section represents a line section which is easy to suffer from lightningstroke or has a lightning stroke fault; determining an easy-to-hit tower located in the easy-to-hit road section, wherein the easy-to-strike pole tower represents a line pole tower which is easy to suffer from lightning stroke or has a lightning stroke fault; additionally arranging a shunt overhead ground wire in a direction different from that of the main overhead ground wire at the position ofthe easy-to-strike tower. The invention further discloses the corresponding overhead ground wire of the power distribution network. By adopting the embodiment of the invention, the lightning current value passing through the main overhead ground wire can be effectively reduced, so that the damage probability of the distribution network transformer is reduced, the lightning protection performance of the distribution network transformer is improved, and the power supply safety and reliability of the distribution network are improved.

Description

technical field [0001] The invention relates to the technical field of lightning protection for electric power systems, in particular to a configuration method for an overhead ground wire of a distribution network and an overhead ground wire. Background technique [0002] With the continuous development of power system technology, the area spanned by transmission lines is becoming wider and wider. In the thunderstorm season, transmission lines are prone to lightning strikes and cause interruption of power transmission, which has become one of the main reasons for power system blackouts. At present, the lightning protection measures for distribution transformers in the distribution network mainly adopt methods such as installing lightning arresters and adding artificial grounding devices. In a few areas, overhead ground wires are also used to reduce the probability of damage to distribution transformers. [0003] However, in the process of implementing the present invention, ...

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Problems solved by technology

[0003] However, in the process of implementing the present invention, the inventor found that the prior art has at least the following problems: when the distribution transformer is located in a mountainous area in a strong lightning zone, if a large-scale lightning strike occurs, even if the grounding resistance is reduced, Installation of overhead ground wires and other methods may also cause lightning arresters to fail due to insufficient capacity, which will lead to power outages in mountainous areas.

And when the insulation level of transmission lines is low, lightning strikes on overhead ground wires often cause counterattacks, causing great harm to surrounding buildings, people, and electrical equipment.

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