The reliable and effective connection between the grounding down conductor of the power equipment and the ground network is the fundamental guarantee for the safe operation of the equipment. During the long-term operation of power equipment, the connection of the ground down conductor may be affected by moisture and other factors, and the connection point may be rusted or even broken, which may increase the resistance of the connection point between the ground down conductor and the main grounding grid, and thus cannot Meet the requirements of electric power regulations, so that there are potential safety hazards in the operation of the equipment, and in serious cases, it will cause the equipment to lose ground. Therefore, in the "Twenty-Five Key Requirements to Prevent Major Accidents in Electric Power Production", it is clearly stated that the continuity test of the down conductor of the grounding device should be carried out once a year.
The grounding on-resistance tester is a portable tester with a high degree of automation developed by our company. It is used to measure the on-resistance between the ground down conductors of various power equipment in the substation. The instrument is controlled by a high-performance single-chip microcomputer, which can realize the intelligent test process. It has the advantages of small size, convenient carrying, simple operation, high precision, fast test speed, good retestability, and intuitive reading. It is an ideal special instrument that meets the requirements of regulations.
Technical index
Output current: 2.5A, 5A, 10A, 20A, 30A
Range: 100μΩ~600mΩ (30A gear)
100μΩ~1Ω (20A gear)
500μΩ~2Ω (10A gear)
1mΩ~4Ω (5A gear)
2mΩ~8Ω (2.5A gear)
Accuracy: 0.2%
Resolution: 0.1μΩ
Working temperature: -10~40℃
Environmental humidity: ≤80%RH, no condensation
Working power supply: AC220V±10%, 50HZ±1HZ
Performance characteristics
1. The whole machine is controlled by a high-speed single-chip microcomputer, with a high degree of automation and easy operation.
2. Using high-frequency switching power supply technology, the output current is large.
3. Perfect protection function and more reliable performance.
4. The response speed is fast, and the data is refreshed automatically.
5. The vertical chassis structure is adopted, which is firm and easy to use on site.
6. Intelligent power management technology, the instrument always works in the minimum power state, effectively reducing the internal heating of the instrument and saving energy.
7. Dot matrix LCD, Chinese menu.
8. Thermal printer, high speed, silent, print out test results.