1. Choose a suitable shaker: If the rated working voltage of the motor under test is 380V, then we can choose a 500V shaker.
2. Shake the watch flat, do a short-circuit test, short-circuit the two test pens, and shake the handle pointer close to 0 is good.
3. Separate the two test pens, shake the handle, and the pointer is close to infinity.
4. When measuring, it is best to remove the connecting piece of the three-phase motor, the shell is grounded, and the bottom terminals of the three windings should be compiled, U, V, W from left to right.
5. The first step: measure the insulation resistance between the three-phase output end and the casing, E contacts the motor casing, L contacts the three terminals U, V, and W respectively, shake the handle quickly (120 revolutions per minute), and wait for the pointer to stabilize at infinity Insulation is good when it is nearby.
6. Step 2: Measure the insulation between the three contacts U, V, and W. Measure the insulation once in pairs. If the three sets of data pointers are all infinite, the insulation is good.
7. It can also be measured without removing the connecting piece. This is the difference between star and delta wiring. In star configuration, the resistance between the three points U, V, W and the neutral point can be measured. The three groups of resistance values are similar. Good, U, V, W three points are measured in pairs, and the resistance value is similar is good. It is more accurate to measure the resistance value with a multimeter, and measure the resistance to ground at the same time.
Post time: Nov-09-2022