Electric power workers often come into contact with circuit resistance testers in their daily work. The circuit resistance tester mainly measures the high-precision contact (circuit) resistance of high and low voltage switches, the DC resistance of cable lines, and other situations that require high current and micro resistance measurements. Due to oxidation of the contact surface and poor contact fastening, the contact resistance increases. When a large current flows, the temperature of the contact point increases, further accelerating the oxidation of the contact surface and increasing the contact resistance. If it continues, serious accidents will occur. Therefore, it is necessary to regularly or periodically measure the contact resistance.
1. The purpose of measuring and testing circuit resistance is to:
Measure the contact resistance of the conductive circuit in a closed state, whether there is friction at the mouth, and whether there is an oxide layer on the contact surface. Check if there are any contact defects in the circuit and if the contact is good.
2. Actual application areas of circuit resistance tester:
① High voltage, medium voltage, and low voltage circuit breakers;
② Switch circuit resistance;
③ Resistance at connection points of high current busbars (such as copper bars, aluminum bars, etc.), contact resistance at conduit connections, resistance at cable connection points, and resistance at welding points.
3. What are the market advantages of circuit resistance testers?
① High current:
By adopting new power supply 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 digit data of 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, while the use of connectors enhances vibration resistance.
④ Convenient to carry:
Small size and light weight.
ZC-302A Contact Resistance Testermeasures up to the latest power system standards--DL/T845.4-2004 designed for measuring loop resistance of Switching Control Tester using High-frequency switching power supply technology and digital circuit technology. Test current of the Tester is 50A, 100A,150A, 200A which is recommended in the national standards. The tester can measure the loop resistance at those values and display results in digital. It is high precision and good stability and can meet most power systems' requirements in onsite high-voltage switches maintenance and high-voltage switches factory loop resistance measurement. (It performances accurately and stably)
Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase. Service hotline: 0086-27-81778799, to learn more, visit the official website: www.kvtester.com
