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The role of transformer DC resistance tester

time:2021/4/28   source:华天电力  reading:290 time

The transformer DC resistance measuring instrument detects the resistance value of the DC resistance to determine the welding and connection quality of the lead wire in the closed loop circuit, whether there is a short circuit or open circuit between the turns of the transformer coil, and whether the tap switch is in good contact, etc. The measurement of the DC resistance of the coil is an indispensable test in the transformer handover test and preventive test.


Transformer DC Winding Resistance Tester.png


The DC resistance measuring instrument is used to measure the DC resistance value of power transformers. The DC resistance value of the transformer has great reference value before entering the transformer maintenance, leaving the factory, and using it. Therefore, the DC resistance measuring instrument is a highly practical device. Professional equipment for measuring the DC resistance of transformer windings and high-power induction equipment.

 

The DC resistance test of transformer windings is an indispensable test item after transformer handover, overhaul, and tap changer change. In the transformer handover, overhaul, minor repair, joint position change, fault inspection and preliminary test, etc., how to measure the DC resistance of the transformer windings, how to treat the role of the DC resistance tester?

 

1. Check the welding quality of the wires and leads inside the winding

 

2. Check whether the contact of each position of the tap changer is good

 

3. Check whether the windings and lead wires are broken.

 

4. Check the correctness of the parallel branch circuit, check whether the windings wound by several parallel wires are broken in one or more places

 

5. Check whether there is a short circuit between layers and turns.

 

The DC resistance measuring instrument adopts new power supply technology, has the characteristics of rapid measurement, small size, convenient use, and high measurement accuracy. It is an ideal device for measuring the DC resistance of transformer windings and high-power induction equipment.


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