Electric wires and cables play a crucial role in the infrastructure construction of our country. Power cables are commonly used in urban underground power grids, power station outgoing lines, internal power supply of industrial and mining enterprises, and underwater transmission lines crossing rivers and seawater. They are composed of four…

The impedance of a direct current path is called a direct current resistance, which is the inherent static resistance of the component when a direct current is applied. The direct current resistance is governed by Ohm's law R=U/I.The impedance of the AC path is called the AC resistance. AC resistance…

The reliability of electrical products has always been one of the important indicators of engineering quality. The reliability of the power grid largely depends on the reliability of various switchgear in the grid. Once the switching device malfunctions, the entire system will not function properly or even become paralyzed, resulting…

Overview of relevant advantages and characteristics of equipment and devices for withstand voltage test of insulating boots (gloves) protective toolsThe personnel engaged in electric power operation are always in the current environment. In order to prevent the occurrence of electric power accidents, they need to take corresponding insulation protection measures.…

Short circuit impedance, also known as voltage impedance, is an important reference to measure the parallel operation and economic efficiency of transformers.The transformer short-circuit impedance and load impedance shall be measured with no-load and on load testers. When testing the short-circuit impedance, the secondary side of the transformer is short…

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…