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The main function of the DC resistance tester

time:2021/3/22   source:华天电力  reading:326 time

The main function of the DC resistance tester. The DC resistance tester determines the welding or connection quality of the leads in the closed loop circuit, whether there is an inter-turn short circuit or open circuit in the transformer winding, and the tap switch by detecting the resistance value of the DC resistance. Whether the contact is good or not, and the DC resistance test of the transformer winding is an indispensable test item in the transformer handover test and preventive test.


The main function of the DC resistance tester is to measure the DC resistance value of the power transformer. The DC resistance value of the transformer has a greater reference value before the transformer is overhauled, delivered from the factory, and put into use. Therefore, the DC resistance tester is a This is a more practical device that is a professional device for measuring the DC resistance of transformer windings and high-power inductance equipment.


Transformer DC Winding Resistance Tester.png


The DC resistance test of the transformer windings is an indispensable test item after the transformer is handed over, overhauled and tap changer changed. The "Regulations" stipulate that the DC resistance of the transformer windings must be measured during transformer handover, overhaul, minor repair, change of tap position, fault inspection and pre-test, etc. The function of the DC resistance tester is:


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 winding or lead wire is broken;


4. Check the correctness of the parallel branch circuit, whether there is one or more disconnections in the winding formed by several parallel wires;


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

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