DUTY UNDER FAULT CONDITIONS. Except where modified below, it is to be assumed that the amount of generating plant simultaneously connected is such that normal voltage will be maintained on one side of any transformer when there is a short-circuit between phases or to earth on the other side. Any transformer may be directly connected to an underground or overhead transmission line and switched into and out of service together with its associated transmission line. All transformers shall be capable of withstanding an external asymmetrical short-circuit between phases according to IEC60076 procedure in addition to one shot five seconds continuous without damage and the test results shall be in compliance with the ranges defined by the IEC60076. Transformers without tertiary windings shall be capable of withstanding for five seconds, without damage, a short-circuit between one phase and earth. The short circuit test shall be witnessed by JEPCO Representative(s) in independent laboratory.
DUTY UNDER FAULT CONDITIONS. Except where modified below, it is to be assumed that the amount of generating plant simultaneously connected is such that normal voltage will be maintained on one side of any transformer when there is a short circuit between phases or to earth on the other side. Any transformer may be directly connected to an underground or overhead transmission line and switched into and out of service together with its associated transmission circuit. ALL TRANSFORMERS SHALL BE CAPABLE OF WITHSTANDING AN EXTERNAL ASYMMETRICAL SHORT-CIRCUIT BETWEEN PHASES ACCORDING TO IEC60076 PROCEDURE IN ADDITION TO ONE SHOT FIVE SECONDS CONTINUOUS WITHOUT DAMAGE AND THE TEST RESULTS SHALL BE IN COMPLIANCE WITH THE RANGES DEFINED BY THE IEC60076. TRANSFORMERS WITHOUT TERTIARY WINDINGS SHALL BE CAPABLE OF WITHSTANDING FOR FIVE SECONDS, WITHOUT DAMAGE, A SHORT-CIRCUIT BETWEEN ONE PHASE AND EARTH. WHERE THIS TEST SHALL BE DONE IN WITNESS OF JEPCO REPRESENTATIVE IN INDEPENDENT LABORATORY.
