On Reliability of 110-500 kV GIS: Operational Experience

\nThe accident rate of gas-insulated switchgears (GIS) is considered. The statistical sample covered 30 110-500 kV switchgear switchgears in a vast region of the European part of the country for the period 2008-2022. Their design features and technical characteristics are given. Significant and insignificant failures of GIS, including their structure, namely, distribution by elements of installations, technical and organizational causes of occurrence, dependence on the year of operation are subjected to analysis. The flow parameter (frequency) of GIS failures is determined, as well as the maximum possible time of GIS restoration after damage to the arc suppression chamber of the pole of the 500 kV circuit breaker. Comparative data are given with failure rate of GIS abroad and with gas-insulated circuit breaker cells in open switchgears.\n