OVERVIEW
Wrindu RDHL series contact resistance test set, utilizing advanced high-frequency switching power supply and digital circuit technology, is designed for measuring loop resistance in switching control equipment. Our instrument with selectable DC 50A, 100A, 150A, or 200A test currents delivers precise and stable digital results. It is tailored for onsite high-voltage switch maintenance and loop resistance measurement in high-voltage switch factories, it aligns with the diverse requirements of power systems.
CHARACTERISTIC
Continuous High Current Output
- Utilizes advanced power supply technology to provide a continuous high current, overcoming the limitations of pulsed power. This capability ensures the effective breakdown of oxide layers on switches, leading to precise testing results.
Robust Anti-Interference Capability
- Maintains reliable performance in high-interference environments. The LCD screen displays test data with a stability margin of only ±1 error, ensuring accuracy even under challenging conditions.
Extended Component Lifespan
- Built with precise resistances that minimize the impact of temperature on measurements, and military-grade connectors that enhance resistance to vibration. These features contribute to a long service life, ensuring consistent performance over time.
Portability and Convenient
- The Contact Resistance Test Set is Designed to be compact and lightweight, making it easy to transport and handle. This convenience is ideal for various testing environments and applications.
FAQ
Q: How do you reduce external earth loop impedance?
A: Methods to reduce external earth loop impedance include:
1. Shortening the length of the earth’s path.
2. Using conductors with a larger cross-sectional area.
3. Installing multiple earth electrodes.
4. Selecting earth electrodes with low-resistance materials.
5. Properly installing and regularly maintaining the earthing system.
6. Creating parallel earth paths.
7. Improving the conductivity of the soil around earth electrodes.
8. Using materials that enhance soil conductivity.
9. Avoiding the presence of current-carrying conductors in the earth’s path.
Q: How do you test earth loop impedance on 3-phase?
A: To test earth loop impedance on a three-phase system:
1. Connect one test lead to Line, another to Neutral, and the third to the incoming Earth.
2. Press TEST.
3. Check for a low ohm reading on the tester.
4. Repeat for each phase.
5. Record readings and compare with standards.
6. Address any high readings promptly.
Q: What is the difference between impedance and resistance
A: Resistance measures opposition to direct current (DC) flow, while impedance encompasses both resistance and reactance, representing total opposition to alternating current (AC) flow. Resistance is measured in ohms and remains constant, while impedance is a complex quantity that varies with AC frequency.
APPLICATION
