2017-10-23

The basic requirements for circuit breakers are as follows: (1) It should be a good conductor in the closing state. (2) In the closing state should have good insulation. (3) When breaking the specified short circuit current, there should be sufficient breaking capacity and the shortest possible breaking time. (4) When the specified short-circuit current is switched on, the contact of the circuit breaker cannot produce fusion welding in a short time. (5) Under the technical conditions given

2017-10-23

According to the installation location of the circuit breaker, it can be divided into indoor and outdoor two kinds; According to the arc extinguishing medium used by the circuit breaker, it can be divided into the following types: (1) Oil circuit breaker. The oil circuit breaker uses insulating oil as the extinguishing medium. Can be divided into multi-oil circuit breaker and low-oil circuit breaker. In the multi-oil circuit breaker, the oil is not only used as an arc extinguishing medium, bu

2017-10-12

Sulfur hexafluoride gas has excellent insulation and arc extinguishing properties, and is called "century gas". Its emergence has caused a very far-reaching innovation in high voltage switchgear. Because sulfur hexafluoride gas has excellent insulation and arc extinguishing performance, it is widely used in today's transmission and distribution switchgear above 110kv and 24kv~36kv generator protection circuit breakers. In the distribution switchgear above 35kv, the electrical industry department

2017-09-19

DLT-846 "High voltage test instrument general technical conditions" Part 5. On the basis of relevant national standards and industry standards, combined with the experience of the power industry and the product technical conditions of domestic and foreign manufacturers, the technical requirements of sulfur hexafluoride trace moisture meter have been specified in order to standardize the production and use of sulfur hexafluoride trace moisture meter.

2017-09-09

Sulfur hexafluoride has good electrical insulation properties and excellent arc extinguishing properties. Its electric strength is 2.5 times that of nitrogen under the same pressure, the breakdown voltage is 2.5 times that of air, and the arc extinguishing ability is 100 times that of air, which is a new generation of ultra-high voltage insulating dielectric material superior to air and oil. Sulfur hexafluoride with its good insulation and arc extinguishing performance, such as: circuit breakers

2017-08-29

In order to ensure the accuracy and stability of the measurement of the SF6 gas quantitative leak detector (WINFOSS-C1), it is necessary to calibrate the instrument before use. 1, Preparation of different concentrations of sulfur hexafluoride gas (1) Gas distribution: using the needle tube method; (2) Standard gas: with qualified pure sulfur hexafluoride gas mixed into 0.01, 0.1, 1, 10, 100, 500 six concentrations of sample gas. (3) Operation: Draw 1 ml of pure sulfur hexafluoride ga