ENTERASYS A2H124-24 Switch module

ENTERASYS A2H124-24 Switch module

The test sequence for three phase transformer consist of three single-phase applications of test voltage to the individual phases with different points of the winding connected to earth at each time. At this type of windings, induced overvoltage test and separate source voltage withstand test ( at the pase terminals ) are performed in the same time.

For the partial discharge performance evaluation, during the phase-to-phase test, measurements should be taken at U2 = 1,3 . Um . For Um = 420 kV and 550 kV transformers with test values of 460 kV and 510 kV, the PD evaluation level should be reduced to U2 = 1,2 . Um during the phaseto-phase test and =1 2 ⋅ 3 2 U , Um/ during the phase-to-earth test.

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Uniformly and non uniformly insulated windings. 

Three- phase transformer shall be tested either phase-to-phase in a single-phase connection or in a symetrical three-phase connection. The neutral terminal ( if present ) of the winding under test shall be earthed. The other separate windings, if they are star-connected they shall be earthed at the neutral, and if they are delta-connected they shall be earthed at one of the terminals or earthed through the neutral of the supplying voltage source. The duration and the voltage levels are given in fig. 7-4.

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