The basic structure of zinc oxide arrester is valve plate. The zinc oxide valve is insulated under the working voltage, and the passing current is very small, generally 10~15 μ A. The nonlinear characteristic of ZnO valve is mainly formed by the grain boundary layer. Its volt ampere characteristic curve…

ZCAR-802 three-phase microcomputer relay protection tester uses high-performance industrial personal computer as the control microcomputer to directly run the Window operating system. The device panel is equipped with a large screen LCD, and the device front panel is equipped with a USB port to facilitate data access, data communication, software…

Application Field and Troubleshooting of 100A Loop Resistance TesterApplication:1. It is suitable for testing the contact resistance of the main contact of high and low voltage switches.2. Suitable for testing DC resistance of high and low voltage cables.3. It is suitable for testing any ultra-low resistance without inductance.The test process…

Why do we need to recycle SF6?1. SF6 is very expensive;2. SF6 is the main greenhouse gas with high global warming potential listed in the Kyoto Protocol, and its global warming potential is 22800 times that of CO 2;3. When SF6 gas contains moisture, it will cause the following hazards…

What is sulfur hexafluoride (SF6)?Sulfur hexafluoride (SF6) is a synthetic fluoride compound with extremely stable molecular structure. It is colorless, tasteless, non-toxic, non corrosive, nonflammable and non explosive gas under normal temperature and pressure. It is a liquid at low temperature and pressure, and becomes a white solid after freezing.What…

Oil immersed transformer is a common transformer. Like all transformers, they will be replaced in 7-15 years. Let's learn how to judge whether the transformer is damaged?1. DGA oil testThe dissolved gas oil test or DGA test is a test that shows gases dissolved in transformer oil. Determine whether the…

Zinc oxide arrester tester is an instrument to test the performance of zinc oxide lightning arrester. It can detect power failure or electrification status, and timely find out whether zinc oxide arrester is aged or affected with damp. It has been widely used in many fields because of its simple…

The load switch is a control appliance with a simple arc extinguishing device, which can open and close the circuit with load. It can open and close a certain load current and overload current, but it cannot disconnect the short-circuit current. It must be used in series with the high-voltage…

The transformer comprehensive test bench complies with relevant national standards. The test bench is mainly used to test the no-load and load characteristics of power transformers and distribution transformers, as well as double frequency induction and power frequency withstand voltage tests of the tested transformers. The measuring part of the…

Transformer DC resistance tester is divided into 1A, 3A, 5A, 10A, 20A, 40A, 50A, 100A and other specifications. The instrument power supply is divided into external power supply AC220V, internal power supply (battery power supply), AC and DC power supply. At present, DC resistance testers above 10A on the market…