When measuring the contact resistance of circuit breakers and disconnectors, operation and maintenance personnel often encounter poor data repeatability and large deviations from historical values. In addition to operational factors, insufficient test current, ambient temperature changes, and poor wiring contact can all affect the results. The XHL-100A Intelligent Loop Resistance Tester has been designed with corresponding features in current output, temperature compensation, and vibration-resistant structure to address these on-site issues. The following explains the key points.
The device provides a DC 100A test current, suitable for switchgear with larger rated currents. The measurement range is from 0.002Ω to the resistance range corresponding to 100A/DC, covering the loop resistance measurement needs of most high-voltage switches. The test current is stable, which helps reduce reading dispersion caused by current fluctuations.
Key components are imported, and a temperature compensation circuit is built into the internal design to reduce the impact of ambient temperature on measurement results. In outdoor substations or sites with large temperature differences, this design helps improve the consistency of measurement data at different times. The connectors adopt a structure with enhanced vibration resistance, reducing poor contact during transportation and operation.
It uses an LCD display, allowing measurement results to be read directly, and supports result printing. No additional transcription is needed for on-site records, making it convenient for archiving and comparing historical data. The operating current is AC220V±10%, adapting to conventional maintenance power supply conditions.
The operating temperature range is -10℃ to 50℃, meeting the needs of most outdoor and switch room environments. The device supports multiple grounding resistance measurement methods, including no auxiliary electrode, three-electrode, four-electrode, and two-electrode methods, allowing flexible selection under different soil and site conditions. The measurement accuracy is Class 0.5, suitable for operation and maintenance personnel to make trend judgments on switch contact status.
When selecting for on-site operation and maintenance, priority can be given to confirming the rated current and loop resistance range of the switch under test, and then checking whether the test current matches. If the measurement environment has large temperature differences or high vibration, attention should be paid to temperature compensation and vibration-resistant connector design. For teams that need on-site printed records, it should be confirmed whether the printing function meets archiving requirements. The XHL-100A provides corresponding functional configurations in the above aspects and can serve as one of the selection references for switch loop resistance measurement.
