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OEM Vacuum Fault Interrupter Transformer Manufacturers – Vacuum interrupter for MV VCB(ceramic shell, Rated voltage: 7.2kV-12kV) – Shone
OEM Vacuum Fault Interrupter Transformer Manufacturers – Vacuum interrupter for MV VCB(ceramic shell, Rated voltage: 7.2kV-12kV) – Shone Detail:
Brief description of the product:
Current chopping in vacuum circuit breaker depends on the vapour pressure and the electron emission properties of the contact material. The chopping level is also influenced by the thermal conductivity–lower the thermal conductivity, lower is the chopping level.
It is possible to reduce the current level at which chopping occurs by selecting a contact material which gives out sufficient metal vapour to allow the current to come to a very low value or zero value, but this is rarely done as it affects the dielectric strength adversely.
High insulating strength: In comparison to various other insulating media used in circuit breaker vacuum is a superior dielectric medium. It is better than all other media except air and SF6, which are employed at high pressure.
When an arc is opened by moving apart the contacts in a vacuum, an interruption occurs at the first current zero. With the arc interruption, their dielectric strength increases up to a rate of thousands time as compared to other breakers.
Pay attention
(1) Measures to prevent overvoltage. Vacuum circuit breaker has good breaking performance. Sometimes when breaking inductive load, high overvoltage is generated at both ends of inductance due to rapid change of loop current. Therefore, for dry-type transformers and other equipment with low impulse voltage resistance, it is best to install overvoltage protection devices, such as metal oxide arresters.
(2) Strictly control the load current.
The overload capacity of vacuum circuit breaker is poor. Since thermal insulation is formed between the contact and the shell of the vacuum circuit breaker, the heat on the contact and the conductive rod is mainly transmitted along the conductive rod. In order to make the operating temperature of the vacuum circuit breaker not exceed the allowable value, its working current must be strictly limited to be lower than the rated current.
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Assume full responsibility to meet all demands of our clients; achieve continuous advancements by promoting the growth of our clients; become the final permanent cooperative partner of clients and maximize the interests of clients for OEM Vacuum Fault Interrupter Transformer Manufacturers – Vacuum interrupter for MV VCB(ceramic shell, Rated voltage: 7.2kV-12kV) – Shone , The product will supply to all over the world, such as: Ukraine, Manchester, Lahore, With the enterprising spirit of" high efficiency, convenience, practicality and innovation", and in line with such serving guidance of "good quality but better price, " and "global credit", we've been striving to cooperate with the automobile parts companies all over the world to make a win-win partnership.
By May from Bandung - 2017.03.28 16:34
This company has the idea of "better quality, lower processing costs, prices are more reasonable", so they have competitive product quality and price, that's the main reason we chose to cooperate.
By King from Nicaragua - 2017.12.19 11:10
