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SF6 66 kv gis switchgear Analysis

End of life estimation of HV switchgear and GIS ...· Analysis of subsequent generations is given in Fig. 5 which reveals that the reliability of the GIS generations installed after 1978 (for 123 kV) or 1988 (for 420 kV) is much better. Fig. 4: Failure rates of GIS installed before 1979 (123 kV) and 1989 (420 kV).

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