HLY-200A Loop Resistance Tester

At present, the conventional QJ44 double arm DC bridge is commonly used for measuring contact resistance in power systems. However, the test current of this type of bridge is only in the mA level, making it difficult to detect the defect of reduced cross-sectional area of the circuit conductor. When measuring the contact resistance of high-voltage switch conductive circuits, the measured value is several times larger due to the influence of oil film and oxide layer between the contacts, and cannot truly reflect the contact resistance value. To this end, the Ministry of Electric Power standard SD301-88 "Code for Handover and Preventive Testing of AC 500KV Power Equipment" and the new version of "Code for Preventive Testing of Power Equipment" stipulate that the measured current of contact resistance of circuit breakers and isolating switches shall not be less than 100A DC to ensure accurate test results.

The contact resistance tester is designed based on the latest power implementation standard DL/T845.4-2004 of the People's Republic of China, using a combination of high-frequency switching power supply technology and digital circuit technology. It is suitable for measuring the circuit resistance of switch control equipment. The test current adopts the recommended DC 100A and 200A according to national standards. The circuit resistance can be directly measured at 100A or 200A, and the final test results are displayed in numbers. The instrument measures accurately and has stable performance, meeting the requirements of on-site high-voltage switch maintenance and high-voltage switch factory circuit resistance testing for power and supply departments.

Product nickname: Contact Resistance Tester, Switch Circuit Resistance Tester, Contact Circuit Resistance Tester, Contact (Circuit) Resistance Tester.

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1. High current: Using the latest power technology, it can continuously output high current for a long time, overcoming the drawbacks of instantaneous current in pulse power supplies. It can effectively penetrate the oxide film of switch contacts and obtain good test results;

2. Strong anti-interference ability: Under severe interference conditions, the last bit of data on the LCD screen can remain stable within ± 1 word range, with stable readings and good repeatability;

3. Long service life: All use high-precision resistors, effectively eliminating the influence of environmental temperature on measurement results. At the same time, the use of military connectors enhances the anti vibration performance;

4. Convenient to carry: small size and light weight;