Inductance transformer

 

 

1 color code inductor test puts multimeter R x 1 block, red and black pens and pick color code inductor, all any of the terminal, the pointer should swing to the right. According to measure the resistance value of size, can identify specific points in the following three conditions:

A color code inductor resistance being measured is zero, its internal short circuit fault.

B measured color code inductor winding inductance coil with the size of the dc resistance of enameled wire diameter, winding circle number is directly related to, as long as it can measure resistance, the measured color code inductor can be thought of as normal.

2 weeks in transformer testing

A multimeter dial to R x 1 block, according to the weeks of the transformer winding pins are arranged in regular, examine the winding on and off, and whether it is normal.

B testing insulation performance Put a multimeter at R x 10 k block, do the following several state testing:

(1) between the primary winding and secondary winding resistance;

(2) the resistance value between primary winding and the shell;

(3) resistance value between the secondary windings and the shell.

The test results in three kinds of condition:

(1) resistance to infinity: normal;

(2) the resistance is zero: short circuit fault;

(3) resistance is less than the infinity, but greater than zero, the leakage fault.

3 power transformer testing

A. by looking at the appearance of transformer to check whether there is obvious anomaly. Fracture, such as whether the coil wire welding, insulation material whether have sear, core fastening screw loosening, silicon steel sheet of rustily, winding coil to see if there is leakage, etc.

B insulation test. With multimeter R x 10 k measuring core and primary, respectively, and the secondary, primary and secondary, core electrostatic shielding layer and the hem between the secondary and secondary winding resistance, multimeter pointer position should be refers to the infinite. Otherwise, the transformer insulation performance.

C coil on and off. Puts a multimeter R x 1 block, tests, if a winding resistance to infinity, explain the winding is open circuit fault.

The primary and secondary coils D discriminant. Power transformer and secondary primary pin pin are generally from the sides, respectively, and primary winding, marked 220 v secondary windings are rated voltage value, such as 15 v, 24 v, 35 v. According to these marks for identification.