Introduction to ZGY-40A DC Resistance Tester:
I. Overview
The ZGY series transformer DC resistance is a mandatory test item in transformer manufacturing for semi-finished and finished products, factory acceptance tests, installation, major repairs, after changing tap changers, handover tests, and preventive tests by power departments. It can check the welding quality of winding joints and whether there are inter-turn short circuits in windings, detect whether the contact of each position of the voltage tap changer is good 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 winding wires. To meet the need for rapid measurement of transformer DC resistance, our company has developed this DC resistance tester. The instrument adopts new power supply technology and features 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 has high testing accuracy and is easy to operate, enabling rapid measurement of transformer DC resistance.
II. Safety Measures
Before using this instrument, you must carefully read this manual.
2 Users of the instrument should have general electrical knowledge.
3 Avoid using the instrument in places with rain, corrosive gases, excessive dust, high temperature, direct sunlight, etc.
4 The instrument should avoid prolonged bumping and severe vibration.
5 Maintenance and debugging of the instrument should be carried out by professionals.
6 After testing, be sure to wait until the discharge alarm sound stops before turning off the power and removing the test leads.
7 When measuring no-load tap-changing transformers, be sure to wait until the discharge indication alarm sound stops before switching gears.
8 During testing, it is forbidden to move the test clips and the power supply lines.
III. Performance Characteristics
1 The whole machine is controlled by a high-speed microcontroller, with a high degree of automation and easy 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 can reliably protect the instrument from the impact of back electromotive force, making performance more reliable.
4 Equipped with audible discharge alarm, clear discharge indication, reducing misoperation.
5 Fast response speed, can directly switch on-load tap changers in the measurement state, and the instrument automatically refreshes data.
6 Adopts a vertical case structure, convenient for field use.
7 Intelligent power management technology, the instrument always works in a low-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.
