Earthing of Gas Insulated Switchgear (GIS) - Basics and Earthing Techniques

摘要

In any safe and reliable substation, a well-designed earthing system plays a crucial role. The absence of safe and effective earthing system can endanger safety of operating person or result in mal-operation of control and protective devices which candisturb the operation of complete power system. Hence great care should be taken while designing earthing system of any substation, primarily to ensure electrical safety of persons working within or near substations.Main functions of any earthing system are:(1) To provide a path for electrical current to earth without exceeding operating limits of equipment's.(2) To provide a safe environment for protecting personnel in the vicinity of grounded facilities from the danger of electrical shock particularly under fault conditions.The purpose of this paper is to provide a reasonable understanding of earthing for GIS systems which both ensures safe operation and does not permit any danger in the event of a short circuit.