Heat dissipating means for circuit-breaker and circuit-breaker with such heat dissipating means
A technology for circuit breakers and radiators, which is applied in the direction of high-voltage air circuit breakers, circuits, high-voltage/high-current switches, etc., and can solve the problems of extra space for cooling components, complex structure of connecting components, and unfavorable problems
Active Publication Date: 2011-04-13
ABB (SCHWEIZ) AG
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Problems solved by technology
As shown in Figure 3, the structure of the connecting parts is complicated and additional space is required for cooling parts, which is disadvantageous for CBs with limited available space
Method used
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[0033] Figure 9 An assembly drawing of a switchgear is shown, for example a circuit breaker (CB) 1 according to the invention. CB1 includes: a vacuum interrupter 2, which accommodates fixed contacts and movable contacts (not shown) for connecting and / or cutting off circuits. The corresponding fixed contact rod supports the fixed contact end in the vacuum interrupter 2 and extends outward from the upper end of the vacuum interrupter 2, and the movable contact rod supports the movable contact end in the vacuum interrupter 2 and extends from the vacuum interrupter. The lower end of the arc chamber 2 extends outward. The combination of the second contact rod and the movable contact end can reciprocate in the vacuum interrupter 2 so as to contact and / or separate from the fixed contact end. The general principle of CB is described above, which is not shown in the figure, but should be obvious to those skilled in the art. The CB of the present invention also includes electrical c...
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The present invention discloses a circuit breaker comprising: a vacuum chamber; a fixed contact and a movable contact disposed in a vacuum chamber; a fixed contact stem supporting said fixed contact in said vacuum chamber and extending outwards from a first end of said vacuum chamber; a movable contact stem supporting said movable contact in said vacuum chamber for reciprocal movement between contact with and separated from said fixed contact, and extending outwards from a second end of said vacuum chamber; a first electrical conductor coupled to said fixed contact stem; a second electrical conductor coupled to said movable contact stem; at least one heat dissipating means disposed for at least one of said fixed contact and movable contact; wherein, the heat dissipating means is hollow and has an external surface and internal surface; a plurality of fins provided on said internal surface, wherein at least one groove is opened on each fin in the direction substantially vertical to the air convection direction, and the air convection direction which the fins define is in parallel to that of reciprocal movement of movable contact stem.
Description
technical field [0001] The present invention relates to circuit breakers, in particular to medium voltage circuit breakers. More specifically, the present invention relates to a heat sink for heat generated by current flowing through a circuit breaker. Background technique [0002] A circuit breaker (CB) is a well known overload protection device for equipment such as high power equipment (eg engines, power lines, transformers, generators, etc.). When the current flows through the CB, the resistance of the CB's contact end, contact rod and conductor generates heat. Assuming a constant resistance, such as R, the heat generated by the flowing current I is approximately I 2 R. In practice, the resistance R will increase as the temperature of the contacts, contact rods and electrical conductors increases, and the heat generated is responsible for the temperature increase. Therefore, the actual heat generated will be far greater than the theoretically calculated value. Gener...
Claims
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Login to View More IPC IPC(8): H01H33/66H01H9/52
Inventor 涂占炜赛伦德拉·辛格
Owner ABB (SCHWEIZ) AG