On-site transformer protection system used for intelligent transformer substation

Abstract

The invention relates to an on-site transformer protection system used for an intelligent transformer substation. As for the transformer protection, the traditional transformer protection is characterized in that the analog quantity and the switching quantity of sides are introduced into the transformer protection device by a long cable to be concentrated and stored when the analog quantity and the switching quantity of sides of a transformer are required to be acquired. According to the on-site transformer protection system, a main control chamber is omitted, and the on-site transformer protection system can protect on-site devices, utilize communication network techniques, provide a corresponding network data transmission scheme, and artfully solve key technical problems of an on-site installed transformer protection realizing scheme. By virtue of redundant design, the on-site transformer protection system can send out warning information, and meanwhile maintain and protect the normal operation through the self-healing of a network switching technique after communication network faults are identified, so that the problem that the reliable operation of the transformer protection system is influenced by the communication network faults can be solved.

Description

technical field [0001] The invention belongs to the field of relay protection automation in the field of electric power engineering, and relates to a design method for in-situ transformer protection of intelligent substations. Background technique [0002] In traditional substations, traditional transformer protection introduces the analog quantities (current and voltage) and switching quantities on each side of the transformer into the transformer protection device through long cables, and the transformer protection device completes the conversion from analog to digital and performs logical discrimination. . [0003] Problems with this approach include: [0004] 1. It occupies a large area. It is necessary to build a main control room to place transformer protection devices, which takes up a lot of land. In the case of increasingly tight land resources, the occupied investment is also increasing. [0005] 2. The protection reliability is affected by the secondary cable. ...

AI Technical Summary

Problems solved by technology

In conventional substations, the secondary equipment operates abnormally because the secondary cables are susceptible to electromagnetic interference and the primary equipment transmits overvoltage

In addition, the multi-point grounding of the secondary circuit and the interference of coupling capacitors may also cause the relay protection device to malfunction

According to the statistics of the National Electric Power Dispatching Center, incorrect protection actions caused by secondary cable problems account for 40% of the total number of faults, and secondary cables actually constitute the main hidden danger for the safe operation of substations.

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