Isolation transformer and low-pass filter wiring b

47. (3) Wiring between isolation transformer and low-pass filter The
    wiring between isolation transformer and low-pass filter is as shown in the figure. Figure (b) is a form of low-pass filter
. In the figure, Li~L4 takes several to tens of millihenries, Ci and C2 take 0.47~211F; C:i takes 01~lyF; R. The nominal voltage UlruA of the varistor
is about 1.3-1.5 times the rated voltage of the power supply, and the current capacity is 1-3kA.

Isolation transformer and low-pass filter wiring b