Three phase DC resistance test is a necessary test item for factory test, installation, handover test and preventive test of semi-finished products and finished products in transformer manufacturing. It can effectively find manufacturing defects of transformer coil such as material selection, welding, loose connection parts, lack of strands, broken wires and hidden dangers after operation. In order to meet the needs of fast measurement of transformer DC resistance, Zhizhuo measurement and control has developed zc-205c three-phase DC resistance tester with the latest technology.
Zc-205c three-phase DC resistance tester adopts a new power technology, which has the characteristics of small volume, light weight, large output current, etc. the whole machine is controlled by a single-chip microcomputer, and automatically completes self inspection, data processing, display and other functions. It has the functions of automatic discharge and discharge indication. The instrument has high test accuracy and simple operation, which can realize the rapid measurement of transformer DC resistance.
Zc-205c three-phase DC resistance tester can test the DC resistance of the three-phase winding of the transformer at the same time. The on load voltage regulating transformer can directly adjust the tap changer without discharging. The measurement time is one third of the traditional single-phase measurement, which can greatly shorten the working time and labor intensity. Its advantages are as follows:
1. It can test the DC resistance of YN three-phase winding of transformer at the same time, which can greatly shorten the measurement time;
2. It can measure the DC resistance of transformer winding quickly and accurately;
3. Perfect protection function;
4. Small size and easy to carry;
5. LCD full Chinese menu, simple and intuitive operation;
6. The test speed is fast, the accuracy is high, the data repeatability is good, and the anti-interference ability is strong.
7. The DC resistance tester can measure the three-phase resistance at the same time, which can greatly shorten the working time;
8. Automatic calculation of three-phase balance, transformer is qualified or not at a glance;
9. For the high temperature transformer just stopped, three-phase data are collected at the same time to avoid the influence of temperature change on three-phase balance;
10. The influence of reducing the oxide film on the three-phase balance of the contact of the voltage regulating switch
In addition, zc-205c three-phase DC resistance tester adopts double power supply structure to connect the winding of the transformer yn with tap connection to realize the three-phase simultaneous power on. The measurement system adopts independent three-channel current sampling and independent three-channel voltage sampling to measure and display the three-phase resistance value and three-phase imbalance rate at the same time, which solves the problem of long time-consuming in DC resistance test of each tap winding of power transformer , the time required is only 1 / 3 of the traditional method, greatly reducing the working time.
