Abstract
The conventional analog type substation is replaced to digital substation using computer based operation system and IEDs (Intelligent Electronic Device) based on IEC 61850. IEC 61850, international standard of substation automation system, describes MMS and GOOSE as the communication services of the digital substation, and most of utilities want to verify the new digital interfaces of the substation automation system and they think that IEC 61850 conformance test from UCA IUG does not assure completed system operation at real site because this test is only the functional test. KEPCO Research institute has been performing technical support as a home doctor on the digital substations. A GOOSE trouble was found at “GOZAN” S/S one of the KEPCO digital substations. This paper presents the specific way to find the reason of the GOOSE trouble found in the substation and introduces how to solve the issue.
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