TJ|H2b offers a time-proven service for the testing of Sulphur Hexafluoride (SF6) that significantly reduces the cost of circuit breaker and GIS maintenance. The Breaker Gas Analysis, BGA®, analytical test procedures are used to determine the composition of the gas including the decomposition products of SF6, moisture and dielectric breakdown voltage. Analysis of SF6 contaminants and breakdown products gives diagnostic information about the operating condition of the gas-filled equipment.
The use of SF6 analysis reduces the maintenance cost of breakers by identifying those breakers that have internal problems, safety issues, or special handling needs. The time required to remove the SF6 gas from a breaker, to perform an internal inspection and replace the gas requires 10 – 20 man-days. The variation in time depends upon the voltage class and model of the breaker. Perhaps more importantly, SF6 analysis reduces maintenance costs by identifying those breakers that do not require maintenance.
Gas analysis is useful throughout the life cycle of the equipment beginning with acceptance testing. This includes verification of the quality of the gas supply as well as the verification of the quality of the gas in equipment that is ready to be commissioned. This addresses purity and contaminant issues that can significantly reduce life.
Time and predictor driven testing during the life of the equipment can provide indication and identification of faults and failure modes. At the same time, the analysis provides indication of the wear out of key interrupter and contact components. This information can be used to schedule and direct in-tank maintenance activities as they are needed. Contact and interrupter parts can be made available before the maintenance has begun.