I. Overview:
ZGY-40A DC Resistance Tester is developed by our company to meet the need for rapid measurement of transformer DC resistance. This instrument adopts brand-new power supply technology, featuring small size, light weight, large output current, good repeatability, strong anti-interference capability, and comprehensive protection functions. The whole machine is controlled by a high-speed microcontroller, with a high degree of automation, and has automatic discharge and discharge alarm functions. The instrument offers high testing accuracy and simple operation, enabling rapid measurement of transformer DC resistance.
Transformer DC resistance is a mandatory test item in transformer manufacturing for semi-finished and finished products, factory acceptance tests, installation, major overhauls, after changing tap changers, handover tests, and preventive tests by power departments. It can check the welding quality of winding connections and whether there are inter-turn short circuits in windings, detect whether the contacts of the voltage tap changer are in good condition at each position and whether the actual position of the tap changer matches the indicated position, whether the lead wires are broken, and whether there are broken strands in multi-strand parallel windings.
Technical Specifications:
1. Output Current: 5A, 10A, 20A, 40A
2. Measuring Range: 50μΩ～500mΩ (40A)
100μΩ～1Ω (20A)
500μΩ～2Ω (10A)
1mΩ～4Ω (5A)
3. Accuracy: 0.2%
4. Resolution: 0.1μΩ
5. Operating Temperature: 0～40℃
6. Ambient Humidity: ≤90%RH, no condensation
7. Power Supply: AC220V±10%, 50HZ±1HZ
8. Net Weight: 14KG
9. Dimensions: 440mm*240mm*390mm
ZGY-40A DC Resistance Tester Performance Features:
1. The whole machine is controlled by a high-speed microcontroller, with a high degree of automation and simple operation.
2. Adopts high-frequency switching power supply technology, with large output current, suitable for DC resistance measurement of large and medium-sized transformers.
3. Comprehensive protection functions, reliably protecting the instrument from the impact of back electromotive force, with more reliable performance.
4. Has audible discharge alarm, clear discharge indication, reducing misoperation.
5. Fast response speed, can directly switch on-load tap changers in measurement state, and the instrument automatically refreshes data.
6. Adopts vertical case structure, convenient for field use.
7. Intelligent power management technology, the instrument always works at the minimum power state, effectively reducing internal heat generation and saving energy. It can work continuously for several hours.
8. Dot-matrix LCD, Chinese menu, print output.
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
