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Transformer detection methods and experience

1、test of Color-coded inductors

　　 put the multimeter in R x 1 block, and the red, black pen connected with each of the outputtings of the color-code inductor, then the clock hand swings. According to the resistance value, it can be classified as three conditions：
　　The resistance value of the measured color-coded inductor is zero, that means the internal exists short-circuit fault.
　　 B、The DC resistance value of the measured color-coded inductor has direct relation with the lacquered wire for the winding and the number of turns of the winding coil. The color-coded inductor is normanl if the resistance value can be measured.

2、detection of intermediate transformer

　　 A、put the multimeter in R x 1 block, and determine whether the intermediate transformer is normal by check the winding whether is make-and-break according to the law of the winding-pin.
　　 B、Testing of insulation 　　put the multimeter in R x 1 block, do the following tests：
　　(1)the resistance value between primary winding and secondary winding；
　　(2)the resistance value between primary winding and the crust；
　　(3)the resiatance value between secondary winding and the crust.
　　There are three results according to the test：
　　(1)the resistance value is infinite: normal；
　　(2)the resistance value is zero:there is short-circuit fault；
　　(3)the resistance valur is smaller than infinite, yet bigger than zero: there is creepage fault.

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