CácMáy đo điện trở ngắt mạch UHV-H200A Micro-Ohmmeter is essential for maintenance engineers and technicians working with high-current electrical systems. Its ability to measure extremely low resistances with high accuracy ensures reliable performance of critical power infrastructure.
Key Features:
1、High Current Testing – Capable of outputting up to 200A DC for accurate low-resistance measurements.
2、Precision Measurement – Measures resistances in the micro-ohm (µΩ) to milliohm (mΩ) range with high accuracy.
3、Wide Measurement Range – Typically 0.1µΩ – 2000mΩ (exact range may vary by model).
4、Digital Display – Clear LCD or LED readout for easy interpretation of results.
5、Data Storage & Transfer – Some models include USB or Bluetooth for data logging and PC connectivity.
6、Automatic Discharge Protection – Ensures safety by discharging inductive loads after testing.
7、Portable & Robust Design – Often built for field use with a durable case.
8、Four-Wire Kelvin Measurement – Eliminates lead resistance errors for precise results.
Typical Applications:
1、Circuit Breaker Contact Resistance Testing – Ensures proper conductivity in high-voltage breakers.
2、Switchgear & Busbar Testing – Verifies low-resistance connections in power distribution systems.
3、Transformer & Generator Winding Resistance – Checks for loose or corroded connections.
4、Welding Joint & Cable Resistance Testing – Assesses the quality of electrical joints.
5、Rail & Grounding System Testing – Measures resistance in grounding networks.
How It Works:
1、Kelvin Clamp Connection – Uses four-wire measurement to avoid lead resistance interference.
2、Current Injection – Applies a high DC current (e.g., 200A) through the test object.
3、Voltage Drop Measurement – Measures the voltage across the test object to calculate resistance (R = V/I).
4、Result Display – Shows resistance value directly on the screen.
Advantages Over Traditional Ohmmeters:
1、Higher current ensures better detection of contact oxidation or loose connections.
2、More accurate than standard multimeters for sub-milliohm measurements.
3、Suitable for field testing in substations, factories, and power plants.
Safety Considerations:
1、Ensure the device is properly grounded before testing.
2、Avoid testing on energized equipment.
3、Follow manufacturer guidelines for maximum test duration to prevent overheating.
