Research of preventing override trip scheme of coal mine underground based on GOOSE

In order to solve problem of frequent override trip in high-voltage distribution network of coal mine underground, the paper analyzed causes of override trip in underground high-voltage distribution network and problems of common solutions in application including electrical locking, centralized control of substation, digital substation and differential protection of optical fiber current. It introduced the superiority of GOOSE message transmission protocol based on IEC61850 standard for data exchange. On the basis, it proposed a preventing override trip scheme based on GOOSE, and described implementation process of the scheme taking an underground high-voltage power line as an example. In the scheme, lower switches only associated with their upper switches, the upper switches and the lower ones communicated longitudinally through GOOSE protocol, and switches with the same grade do not communicated to each other, so as to improve real-time and reliability performance of information transmission.