6
that HZJ high frequency voltage winding is connected with the excitation wilding, and
make their parameter the same with the next-step primary winding.
3.2 Schematic drawing of two set of HZJ series excitation test transformers.
3.3 Schematic drawing of three set of HZJ series excitation transformers.
Explanation
：
Control unit will provide power to the primary test winding, at the same time, the end and
crust of primary high frequency voltage winding touches the floor, the head will be
connected with high frequency voltage’s end and its crust of the secondary test
transformer. The primary series excitation switch provides power to the secondary low
frequency voltage excitation winding. The same principal can be applied into the tertiary,
the output voltage of the tertiary test transformer is the voltages sum of these three test
