Abstract: In order to solve the implementation problems of GOOSE isolation measures, this paper analyzes the mechanism of different GOOSE isolation techniques and their features in Smart Substation, and studies the maintenance mechanism and the soft strap principle. According to the reliability of the existing isolation techniques, it is proposed that the safety measures of GOOSE in Smart Substation should consist of at least two isolation techniques with different principles. Finally, by taking the isolation maintenance of a 220 kV transmission line for case study, the implementation principles of the Smart Substation safety measures is introduced and the isolation measures of the operating and maintenance equipment are described, which can provide a reference for the implementation of GOOSE safety measures.

Key words: smart substation, maintenance mechanism, soft strap, isolation measures, relay protection device, GOOSE, operation equipments