It is an instrument for simultaneous measurement of DC resistance of three phases in large-capacity transformer windings.YQ-20A Three-Phase TransformerDC Resistance Tester can test three phases of transformer windings simultaneously. For on-load tap-changer transformers, it can directly adjust the tap without discharging, and the test time is only one-third of traditional methods, solving the problem of long testing time for DC resistance of power transformers. The instrument features a large-screen LCD display, Chinese menu prompts, a high-speed printer, and data storage functions, facilitating data reading and recording. The test data is stable, with good repeatability, strong anti-interference capability, and fast charge/discharge speed, making it the best choice for on-site testing of transformer DC resistance.
II. Main Functions and Features
1. For windings with a neutral point lead in star connection, the instrument can test the DC resistance of phases A0, B0, and C0 simultaneously, greatly saving test time;
2. Displays and prints all test data of high, medium, and low voltage windings of the transformer, and automatically calculates the three-phase unbalance rate;
3. Has comprehensive back-EMF protection function;
4. Has automatic discharge and discharge indication functions, reducing misoperation and ensuring equipment and personnel safety;
5. The instrument can permanently store 500 sets of test data, and also supports USB flash drive for data storage;
6. The instrument uses a 5.7-inch large LCD display and can print test results at any time;
7. YQ-20A Three-Phase Transformer DC Resistance Tester features wide applicable temperature, high precision, shock resistance, anti-interference, and portability.
III. Main Technical Specifications
Output Current Three-phase test: 2*10A, 2*5A, 2*2A
Single-phase test: 20A, 10A, 2A
Test Range 2*10A: 500μΩ～500mΩ
2*5A: 1mΩ～1Ω
2*2A: 2.5mΩ～2.5Ω
20A: 250μΩ～1Ω
10A: 500μΩ～2Ω
2A: 2.5mΩ～10Ω
Resolution 0.1μΩ
Measurement Accuracy ±(0.2%+2 digits)
Dimensions 420mm×250mm×340mm
Weight 13kg
