2016-04-12

In the electric field, one stage is a plate and the other is a rod electrode, forming a rod-plate electrode and constituting an uneven electric field. When the voltage is applied to the rod-plate electrode, the electric field near the rod electrode is very strong, and the electric field drops sharply after a certain distance from the rod. At this time, the rod electrode and the surrounding gas have reached self-sustaining discharge, and corona occurs around it, which is called corona discharge.

2016-04-08

Some of the data obtained by SF6 gas insulation under a more uniform electric field are relatively accurate, and can be used as a reference in the study of new products. The conditions under non-uniform electric field are more complex and difficult to study. Generally, non-uniform electric field is not used.

2016-04-06

Gas insulating medium has obvious advantages compared with liquid and solid, which are reflected in the following aspects: (1) The conductivity is very small, and there is actually no dielectric loss. (2) The dirty matter produced under the action of arc and corona is very small, there will be no obvious residual changes, and the self-recovery performance is good. (3) In the uniform or uneven electric field, the insulation strength of the gas insulation increases with the increase of the gas

2016-04-05

Pure SF6 gas is a very stable gas comparable to nitrogen and is not toxic. Its harm to the human body is mainly manifested in the following aspects: (1) SF6 is a heavy gas, especially in the room may cause suffocation. (2)SF6 new gas may be mixed with some toxic substances due to various impurities in the preparation process. An effective way to test this is through biological experiments. Outgoing gas They all have to pass the inspection. (3) Hydrogen fluoride, sulfur dioxide, sulfur tetraf

2016-03-27

High purity (SF6) sulfur hexafluoride is a gas at normal temperature and pressure, and it is easier to liquefy to liquid under a fixed pressure after the temperature is reduced. When the ambient temperature rises, the corresponding liquefaction pressure rises correspondingly and becomes a gas that is not easy to liquefy. When the temperature exceeds the critical temperature of 45.55 ° C for SF6, it cannot be liquefied.

2016-01-29

In SF6 gas-insulated electrical equipment, the magnitude that causes SF6 gas to decompose and discharge to consume energy is divided into three categories: arc discharge, spark discharge, and corona discharge or partial discharge. Arc discharge: Under normal operating conditions, the circuit breaker will produce arc discharge when it is broken; When a short circuit fault occurs in the gas chamber, arc discharge will also occur. The discharge energy is related to the arc current.