Contact Resistance Tester, Switch Loop Resistance Tester, Contact Loop Resistance Tester, Contact (Loop) Resistance Tester, Micro-ohmmeter
Product Features
1. High Current: The loop resistance tester uses power supply technology to continuously output high current for a long time, overcoming the drawbacks of instantaneous current in pulse power supplies. It can effectively break through the oxide film on switch contacts, yielding good test results.
2. Strong Anti-interference Capability: Under severe interference conditions, the last digit of the LCD reading can stabilize within ±1 digit, ensuring stable readings and good repeatability.
3. Long Service Life: All components use high-precision resistors, effectively eliminating the influence of ambient temperature on measurement results. Additionally, the use of connectors enhances vibration resistance.
4. Portable: Compact size and light weight.
Product Introduction
Currently, in power systems, the conventional QJ44-type double-arm DC bridge is commonly used to measure the DC resistance of transformer windings and the loop resistance of high-voltage circuit breakers. However, the test current of such bridges is only in the mA level, making it difficult to detect defects such as reduced cross-sectional area of conductors in transformer winding conductive loops. When measuring the loop resistance of high-voltage switch conductive loops, the influence of oil films and oxide layers between moving and static contacts can cause the measured resistance value to be several times larger, masking the true loop resistance value. The Ministry of Electric Power standard SD301-88 "Regulations for Handover and Preventive Tests of AC 500kV Electrical Equipment" and the new edition of "Regulations for Preventive Tests of Electrical Equipment" stipulate that the measurement current for circuit breaker and disconnector loop resistance shall not be less than 100A to ensure measurement accuracy.
According to the People's Republic of China electric power execution standard DL/T845.4-2004, this tester is designed by combining high-frequency switching power supply technology with digital circuit technology. The loop resistance tester is suitable for measuring the loop resistance of switch control equipment. Its test current adopts the DC 100A and 200A recommended by national standards. It can directly measure loop resistance at a current of 100A, and also at 200A, with the final test results displayed digitally. It features accurate measurement and stable performance, meeting the requirements for on-site high-voltage switch maintenance in power and power supply departments, as well as loop resistance testing in high-voltage switch factories.
Product Parameters
1. Measurement Range: 1~1999μΩ, Resolution: 1μΩ
2. Measurement Current: 0~100A adjustable
3. Measurement Accuracy: Current 1.0 class, Resistance 1.0 class
4. Display Mode: Three and a half digit LED digital display
5. Working Mode: Continuous
6. Power Supply: AC220V
7. Dimensions: 300mm×250mm×162mm
8. Weight: 5Kg
Keywords: Contact Resistance Tester_Very Low Frequency High Voltage Generator, Contact Resistance Tester_Very Low Frequency High Voltage Generator
