In order to meet the needs of rapid measurement of transformer DC resistance, the company has developed KDKR-S20A transformer three-phase DC resistance tester with its own technical advantages. The instrument adopts the new power supply technology, the whole machine is controlled by the single chip microcomputer, automatically complete the self-test, data processing, display, printing and other functions, with automatic discharge and discharge alarm indicator function. The instrument has the advantages of high measuring precision and simple operation, and can realize the rapid measurement of transformer direct resistance.

Functional characteristics
Three-phase test: For the transformer with YN or yn connection on the high voltage side or low voltage side, only one connection is needed. The instrument can test the DC resistance of A0, B0 and C0 by three-phase simultaneous measurement, and automatically calculate the three-phase unbalance rate to save the test time;
Single-phase test: for any connection mode of the transformer, only one connection, the instrument can operate and select any winding of the transformer for testing, the whole test process does not need to reverse the test line;
There is a test matrix inside the instrument, which can save the DC resistance value of each phase test at each tap position of the transformer and the three-phase unbalance rate, and can also print and convert the DC resistance value to the rated temperature;
The instrument adopts 5.7 inch LCD display, which can be clearly seen in the sunlight;
The instrument comes with high-speed micro thermal printer: can print measurement and historical data;
The instrument can store 500 sets of test data, and can also use a USB disk to store data;
The instrument has perfect anti-potential protection function.
The instrument has the function of automatic discharge and discharge alarm, which can reduce misoperation and ensure the safety of equipment and personnel.
The instrument has the characteristics of wide applicable temperature, high precision, shock-proof, anti-interference and easy to carry.
 
Conditions of use
Ambient temperature: -10℃ ~ 50℃
Ambient humidity: ≤85%RH
Working power supply: AC220V±10%
Power frequency: 50±1Hz

Technical parameter
Output current: Three-phase test: 2*10A, 2*5A, 2*2A
Single-phase test: 20A, 10A, 2A
Test scope:
2 x 10A: 500μΩ to 500mΩ
2*5A: 1 Mω to 1Ω
2*2A: 2.5mΩ ~ 2.5Ω
20A: 250μΩ to 1Ω
10A: 500μΩ to 2Ω
2A: 2.5mΩ to 10Ω

Resolution: 0.01μΩ
Measurement accuracy: ±(0.2% reading +0.2μΩ)
Overall dimensions: 420mm×250mm×340mm
Weight: 15kg