A 10kv bus differential protection method based on the process layer networking mode of intelligent substation

Abstract

The invention, which belongs to the field of power system transformation engineering, relates to a 10-kV bus differential protection method based on a process layer networking mode of a smart substation. Since the traditional substation 10-kV bus is not configured with bus differential protection, faults can not be cut and removed rapidly; and the 10-kV bus fault is removed by relying on the long-term backup protection like over-current protection of the low-voltage side of the main transformer, so that the safety of the primary equipment and the stability of the distribution network are affected. According to the invention, on the basis of the information sharing of intelligent substations, interlocking and starting conditions are added for the bus differential protection logic, the application of 10-kV bus differential protection is realized; the bus fault can be removed rapidly; the primary equipment is protected; and the operational reliability of the substation is improved.

Description

technical field [0001] The invention relates to a 10kV bus differential protection method based on an intelligent substation process layer networking mode, belongs to the field of power system transformation engineering, and is mainly applied to the 10kV bus of a medium-low voltage substation in a power grid. Background technique [0002] At present, in the design of substations, according to the "Technical Regulations for Relay Protection and Safety Automatic Devices", the 10kV busbar is not equipped with busbar differential protection, and the 10kV busbar fault is eliminated by relying on long-term backup protection such as overcurrent protection on the low-voltage side of the main transformer. Therefore, if the 10kV bus fails, the fault cannot be removed quickly, resulting in aging equipment insulation and shortening the service life. At the same time, due to the long time for remote backup protection to remove faults, accidents such as switch refusal to operate and explo...

AI Technical Summary

Problems solved by technology

Therefore, if the 10kV bus fails, the fault cannot be removed quickly, resulting in aging equipment insulation and shortening the service life

At the same time, due to the long time for remote backup protection to remove faults, accidents such as switch refusal to operate and explosions often occur, which seriously affect the restoration of power transmission and the stability of the distribution network, and bring economic losses to power grid enterprises and users.

[0003] Traditional busbar differential protection is mostly used in substations above 110kV, such as the Chinese patent application number: 201610960501.3, mainly because more current transformers and related current, tripping and other secondary cables need to be configured, each load protection device and busbar differential protection There are many start-up and blocking circuits between the dynamic protection devices, which increases investment on the one hand, and complex circuits on the other hand, requiring more operation and maintenance work

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