How to check transformer coil short circuit?

Checking transformer coil short circuit is an important maintenance work to ensure the normal operation and safety performance of the transformer. Here are some common methods to check transformer coil short circuit:

1. Appearance inspection: First, perform an appearance inspection of the transformer. Observe whether the coil shows signs of burning, melting or deformation. If the coil is found to be obviously damaged, there may be a short circuit problem.

2. Insulation resistance test: Use an insulation resistance tester to test the transformer coil. Connect the tester's probes to both ends of the coil, and then measure the insulation resistance value. Under normal circumstances, the insulation resistance value should be high. If the measurement result is abnormally low, it may indicate that the coil is short-circuited.

3. DC resistance test: Use a DC resistance tester to test the transformer coil. Connect the tester's probes to both ends of the coil, and then measure the DC resistance value. Under normal circumstances, the DC resistance value should be low. If the measurement result is abnormally high, it may indicate that the coil is short-circuited.

4. Voltage test: Use a multimeter or oscilloscope to perform a voltage test on the transformer coil. Connect the tester's probes to both ends of the coil, and then measure the voltage value. Under normal circumstances, the voltage value should be stable within the rated value range. If the measurement result fluctuates abnormally or is lower than the rated value, it may indicate that the coil is short-circuited.

5. Current test: Use an ammeter to perform a current test on the transformer coil. Connect the probe of the ammeter to the input end of the coil and then measure the current value. Under normal circumstances, the current value should be stable within the rated value range. If the measurement result fluctuates abnormally or exceeds the rated value, it may indicate that the coil is short-circuited.

6. Thermal imaging detection: Use an infrared thermal imager to perform thermal imaging detection on the transformer. By observing the thermal image, it can be determined whether the coil is overheated. If it is found that the temperature of a certain area is significantly higher than that of other areas, there may be a short circuit problem.

7. Professional detection: If the above methods cannot determine whether the transformer coil is short-circuited, or more accurate detection results are required, it is recommended to ask professional power equipment maintenance personnel or manufacturers to perform detection and maintenance.

In short, checking the short circuit of the transformer coil requires the comprehensive use of multiple methods to ensure accuracy and reliability. Timely detection and handling of short circuit problems can effectively avoid transformer failures and safety accidents.