Thermal mastering of MV/LV prefabricated substation

Among the type tests listed in IEC 62271-202 standard, the temperature-rise test is no doubt one of the major tests used to validate the performance of MV/LV prefabricated substation architectures. The approached used for thermal design of MV/LV prefabricated substations has often been either: - practical, i.e. by iteration: tests, measurements, corrections, - by calculations based on analytical formulas used in building design, where many heat transfer coefficients are established arbitrarily and can cause the result to vary significantly.