The use of DW15 circuit breaker
DW15 universal type air circuit breaker is actually a kind of frame breaker, breaker compared with DW10, the difference lies in: from the protection point of view, DW10 series is instantaneous, and DW15 series has a type, two section and three section type frame type circuit breaker. Many customers in the view of the production company DW15 universal circuit breaker page, reflecting the lack of use, so I do here under, and they hope to help everyone!
DW15 series universal type circuit breaker for general ACB DW15 and current-limiting type universal circuit breaker DWX15. The series circuit breakers for the frequency of ACI 140V, rated current to 4000A. For the distribution of power, to the power lines and equipment overload, under-voltage and short circuit protection, the product has three sections protection characteristics, and also can be used for selective protection of power grid.
Figure 1: DW15 structure of circuit breaker
1 - saturated current transformer ( or a current and voltage converter ); 2 - instantaneous overcurrent release; 3 - floor;
4 - static contact; the moving contact 5 -; 6 - arc shield; 7, the electromagnet; 8 - operation mechanism; 9, undervoltage tripper;
10 - the resistance-capacity delay device; 11 - thermal relay ( or electronic tripping device );
12 - points, and signs; 13 - breaking button; 14 - shunt tripping device
DW15 series air circuit breaker ( Figure 1 ) of 200A-630A and 1000A-4000A two current segment. Start with smaller current period, in order to improve the breaking capacity, the energy storage switching mechanism, so that the contact closing and breaking speed and manual operation speed, thus achieving a rapid on-off, improves the closed short-circuit current capacity, and in the contact system (1 in 2) borrow quick electromagnet pull off dead link structure, the contact of the short circuit current produced by the effect of electrodynamic repulsion force can precede operation energy storage mechanism for releasing, thereby significantly shortening breaking time, improves the ability of breaking short-circuit current. Type DW15 circuit breaker ( such as the common DW15-630 ) operating energy storage mechanism in current period compared with DW10, the energy storage spring operating mechanism at the same time, also used by the transmission of the cam four bar linkage, the circuit breaker operation process is divided into two movements, a continuous complete: energy storage ( O1 counterclockwise rotation ); the energy storage spring stored energy impact release ( O1 clockwise rotation), so that the circuit breaker is closed, the breaker tripping half shaft, rotation, so that the lever 8 tripping, contact fast breaking. In this way, the circuit breaker can be greatly improved in the current paragraph breaking capacity. In order to meet the need of 1140V power supply, and is also provided with the arc isolating boards in. The static contact is fixed with an arc resistant insulating cover. This prevents the phase and phase dynamic, static contact between the breakdown, and to make the structure more compact.
DW15 circuit breaker contact material used for the moving contact materials for AgNi30, AG-WC12C3 for static contact materials, such a dynamic and static contact pair can meet low temperature rise, high ability of resisting welding and electrical wear resistance requirements. Arc contact with arc resistant material made of AgW40.
That is: 1000A and above the circuit breaker, the switch on the short circuit current is very large, so the contact system structure should be to reduce the huge electric repulsion and improve stability as the main requirements. The approach taken is in dynamic, static contact arranged a special circuit, making it very near the same spacing and current direction, thereby using the short circuit current generated by electromagnetic force F to strengthen the contact pressure, thereby improving the ability on short circuit current.
The above information is provided in electrical switch factory, reference www.jiandq.com