When the transformer is cross-connected, overhauled or some of its switches are changed, direct current resistance testing of the transformer winding is necessary;
In general, to measure the transformer winding or large power output indicator equipment, the traditional electrical bridge method and pressure drop method require much time and energy.
Thus, to shorten the measurement time and reducing the workload of testers, we developed rapid direct current resistance tester, which is designed with new power supply technology and stable performance, fast measurement, compact, easy to use, high accuracy, good data reproducibility.
Transformer DC Winding Resistance Tester is an ideal equipment for measuring transformer winding and large power output inductor equipment.

Features:

Transformer DC Winding Resistance Tester is used for testing, installing and exchanging the semi-finished or finished transformer.
It can effectively help you to find disfigurements in the manufacturing of transformer, such as the winding choosing, welding, loose joints, missing shares and hidden danger in the running.
Transformer DC Winding Resistance Tester is suitable for large-scale transformer above240MVA in temperature rising tests.
840MVA transformer low-voltage direct-resistance tester completed within 2 minutes and the data is stable and accurate.
Dual-channel shows the measurement data at the same time.
Each interval of 60 seconds automatically print data.
Equipped with temperature conversion software, curve waveforms.

Specifications:

Item	WRT-2A	WRT-5A	WRT-10A	WRT-20A	WRT-40A	WRT-100A	WRT-20S
Test current	2A	5A	10A	20A	40A	25A,50A, 100A	Single phase: 1A,5A,10A,20A, 40A Three phase: 1A, 5A, 10A, 20A
Measuring range	1μΩ~ 4.5kohm	1μΩ~ 20kohm	1μΩ~ 20kohm	1μΩ~ 10kohm	1μΩ~ 10kohm	50μΩ-200mΩ(100A) 100μΩ-400 mΩ(50A) 200μΩ-800 mΩ(25A)	Single phase: 10mΩ～20Ω(1A) 1 mΩ～4Ω(5A) 1 mΩ～2Ω(10A) 1 mΩ～1Ω(20A) 1 mΩ～0.5Ω(40A) Three-phase: 10 mΩ～6Ω (1A,each phase) 1 mΩ～1Ω (5A,each phase ) 1 mΩ～0.6Ω (10A,each phase ) 1 mΩ～0.3Ω (20A,each phase )
Resolution	1μΩ
Max. Error	0.2%RDG+2D
Voltage output	20V
Resolution	1μΩ
Power supply	AC220V±10%% 50Hz/60Hz
Working environment	-10℃-+40℃ RH≤85%

5A Power Transformer DC Winding Resistance Tester with Printer

Laboratory Test Equipment