EPRO RSM020 Transfer switch module

EPRO RSM020 Transfer switch module

Total loss injection ( 1. Part of the test ) : Supplied with total losses. The test is continued until a steady-state oil temperature rise is established ( i.e. the difference between top oil temperature and ambient temperature is less than 1° C for 3 hour ). This period is called as first part of the test. The supply values and the temperatures of different points are recorded at suitable time intervals.

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Rated current injection ( 2. Part of the test ) : 

When the top oil temperature rise has been established, the test shall immediately continue with rated current supply one hour. This period is called as second part of the test. The supply values and the temperatures are recorded as above. At the end of one hour, supply is disconnected and the hot-resistance of windings are measured. The test connection is changed for carrying out the resistance measurement and after the inductive effects have disappeared the resistance time-curves are measured for a suitable period of time than by extrapolation method the resistance value of the winding at the instant of switching off the supply is determined.

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