Mixed gas (SF6/CF4) options available on select products. Temperature range: –30°C to +50°C (-50°C capability with tank heaters across all ratings. -50C capability with mixed gas (SF6/CF4) on select products) Meets IEEE and IEC Standards. Fully assembled and tested in the USA.
A circuit breaker in which SF6 under pressure gas is used to extinguish the arc is called SF6 circuit breaker. SF6 (sulphur hexafluoride) gas has excellent dielectric, arc quenching, chemical and other physical properties which have proved its superiority over other arc quenching mediums such as oil or air. The SF6 circuit breaker is mainly divided into three types.
In the normal operating conditions, the contacts of the breaker are closed. When the fault occurs in the system, the contacts are pulled apart, and an arc is struck between them. The displacement of the moving contacts is synchronised with the valve which enters the high-pressure SF6 gas in the arc interrupting chamber at a pressure of about 16kg/cm^2.
The SF6 gas absorbs the free electrons in the arc path and forms ions which do not act as a charge carrier. These ions increase the dielectric strength of the gas and hence the arc is extinguished. This process reduces the pressure of the SF6 gas up to 3kg/cm^2 thus; it is stored in the low-pressure reservoir. This low-pressure gas is pulled back to the high-pressure reservoir for re-use.
Now a day puffer piston pressure is used for generating arc quenching pressure during an opening operation by mean of a piston attached to the moving contacts.
SF6 gas has excellent insulating, arc extinguishing and many other properties which are the greatest advantages of SF6 circuit breakers.
The gas is non-inflammable and chemically stable. Their decomposition products are non-explosive and hence there is no risk of fire or explosion.
Electric clearance is very much reduced because of the high dielectric strength of SF6.
Its performance is not affected due to variations in atmospheric condition.
It gives noiseless operation, and there is no over voltage problem because the arc is extinguished at natural current zero.
There is no reduction in dielectric strength because no carbon particles are formed during arcing.
It requires less maintenance and no costly compressed air system is required.
SF6 performs various duties like clearing short-line faults, switching, opening unloaded transmission lines, and transformer reactor, etc. without any problem.
Disadvantages of SF6 circuit breakers
SF6 gas is suffocating to some extent. In the case of leakage in the breaker tank, the SF6 gas being heavier than air and hence SF6 are settled in the surroundings and lead to the suffocation of the operating personnel.
The entrance of moisture in the SF6 breaker tank is very harmful to the breaker, and it causes several failures.
The internal parts need cleaning during periodic maintenance under clean and dry environment.
The special facility requires for transportation and maintenance of quality of gas.
1. Cabinet part: all right-angled parts that operators may come into contact with are all reversed at R angles to prevent scratching and hurting people; the improved busbar frame is more convenient to install busbars and has a more beautiful appearance; the ventilation grid installed on the top cover has anti- Drip function; the top cover is an open structure, which is convenient for users to place horizontal busbars on site;
2. Drawer part: the drawer adopts double-folding positioning groove rivet riveting process, and all parts are molded at one time, so that the drawer is 100% interchangeable. At the same time, the double-folding and rivet technology solves the defects of sheet burr and self-tapping screw tip injury;
3. Connectors: The first-time plug-in for the incoming and outgoing lines of the drawer can be directly used in conjunction with the function board and the metal channel, and the secondary connector is convenient to connect and the wiring is beautiful;
4. Vertical channel: half functional board or iron rectangular channel can be selected, and can be easily interchanged.
1.Q: Are you a manufacturer or trader?
A:We are all, Main business of the company low-voltage switchgear, power distribution cabinet, explosion-proof cabinet design, production and system programming.
2.Q: Whether to support OEM/ODM?Can you design the equipment according to our size?
A: Of course, we can customize any product according to customer requirements, and we can provide design solutions and solutions.
3.Q: Why should I buy from you instead of someone else?
A: First of all, we can provide all customers with very professional support consisting of IT consultants and service teams.Secondly, our main engineers have more than 20 years of experience in power distribution equipment development.
4.Q:What about the delivery time?
A:Generally, our delivery time is around 7-15 days about. While, it depends on the requirement of customers and the
quantity of products.
5.Q:What about the shipment?
A:We can arrange shipment by DHL, FedEx, UPS,etc.of course, customers can also use their own freight forwarders.
6.Q:How about the terms of payment?
A:Supported T/T、Paypal、Apple Pay、Google Pay、Western Union,etc. Of course we can discuss on this.