Short-circuit accident protection processing system of power distribution network

Abstract

The embodiment of the invention provides a short-circuit accident protection processing system of a power distribution network. The short-circuit accident protection processing system comprises a current-limiting reactor and protection processing equipment, wherein the current-limiting reactor and the protection processing equipment are arranged in parallel at set positions of a power distributionnetwork line, the set positions comprise at least one or more of a position in an outgoing line switch cabinet of a substation, a switch position of an initial-stage column of an overhead line, a switch position of a power distribution network branch and a user grading switch position, the protection processing equipment is used for limiting a short current to be an overcurrent or overload levelwhen a short-circuit accident of the power distribution network occurs, so that multi-stage differential protection matching of an automatic system of the power distribution network is achieved. Sincethe current-limiting reactor and the protection processing equipment, which are arranged in parallel, are arranged at the set positions of the power distribution network line, voltage drop of other branches cannot be caused, the whole power distribution network system is stable, local accident isolation without dependent on multi-stage differential matching of the system is further achieved, theimpact of the accident to the power distribution network is effectively reduced, and the voltage of the power distribution network is stabilized.

Description

technical field [0001] The invention relates to the technical field of power supply and distribution, in particular to a protection and processing system for a short circuit accident of a distribution network. Background technique [0002] Short circuit accident is a relatively common accident in the operation of power system distribution lines. The instantaneous current generated when a short-circuit accident occurs will cause damage to other components in the power system, thereby causing other more serious accidents. Usually the cause of the short circuit accident is mainly due to the short circuit between different potential conductors in the power system. For example, different circuits are protected by an insulating layer. Once the insulating layer is damaged, it will lack insulation protection and cause a short circuit. [0003] Once a short-circuit accident occurs, when an excessively high short-circuit current flows through the power equipment, it will cause a str...

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Problems solved by technology

[0003] Once a short-circuit accident occurs, when an excessively high short-circuit current flows through the power equipment, it will cause a strong thermal effect. If the short-circuit accident lasts for a long time, it is likely to cause damage to the equipment due to overheating or cause insulation of lines and equipment. At the same time, when the distribution line is short-circuited, the system voltage will drop, and the closer to the point where the short-circuit accident occurs, the more obvious the voltage drop will be, which will seriously affect the power quality, especially for some induction motors in the distribution network, which may be due to The voltage drops and stops running, causing equipment damage and product scrapping.

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