JPH0140111Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention mainly relates to an improved structure of a cooling fin in electrical equipment such as a cutter.
The present invention will be explained below using an example in which the present invention is applied to a high current circuit breaker installed in the main circuit of a generator.

In general, the above-mentioned high current power line breakers (hereinafter referred to as generator line breakers) are connected to the separated bus at both ends, and are used to flow cooling air between the main bus and the outer sheath of the separated bus. Therefore, the rated current carrying capacity is upgraded and used. However, since the cooling efficiency of the shingle breaker is generally lower than that of a simple-shaped separated busbar, cooling fins are often provided in the current-carrying member of the shingle breaker.

By the way, when cooling fins are provided on a current-carrying member in the same direction as the current path, current tends to concentrate on the fins due to the skin effect, and as a result, the amount of heat generated increases and the fins do not work properly. The following phenomenon occurs. Further, even if such a phenomenon is countered by increasing the fin cross-sectional area, there is a disadvantage that there is a lot of waste in terms of fin efficiency, and the overall weight increases, creating a vicious cycle.

This invention eliminates the above-mentioned drawbacks and makes it possible to increase the efficiency of the cooling fin with a simple structure. FIG. 1 shows an example of application of the present invention, and shows the structure of a generator and a disconnector. That is, in FIG. 1, numerals 1 and 2 are aluminum tanks, which have a structure that serves as both a pressure vessel and a current-carrying path. Reference numeral 3 denotes an insulating tube, and within this insulating tube 3 is a puffer-shaped arc extinguishing chamber, which is shown in a closed circuit state in FIG. 4
a, 4b are phased bus terminals, 5a, 5b are flexible conductors, 6a, 6b are mechanical buttons, 7a, 7b
8a and 8b are flanges, 8a and 8b are main contacts, 9 is a cylinder, 10a and 10b are cooling fins arranged radially around the outer periphery of the aluminum tanks 1 and 2, respectively, in alignment with the current path direction, and 11 is an outer cover. be. In such a structure, in a constantly energized state, the aluminum tank 1 → flange 7a → main contact 8a → cylinder 9 → main contact 8b → The structure is as follows: flange 7b→aluminum tank 2→mechanical clutch 6b→flexible conductor 5b→terminal 4b.

Here, the cooling fins 10a and 10b force the cooling air supplied from the phase separation bus bar as shown by arrow A into the space formed between the outer jacket 11, the aluminum tanks 1 and 2, and the arc extinguishing chamber tube 3. When cooling, it works to efficiently dissipate the heat generated by the breaker section. However, as described above, since the mounting direction of the fins and the current path are the same, the current flows concentrated in the fins due to the skin effect as shown in FIG. 3, and the cooling fins may have an adverse effect.

Therefore, in the present invention, as shown in FIG. 4, a plurality of slits 12 are provided in the fin 10 itself to prevent the flow of current in the direction of extension of the fin 10.
The impedance is equivalently increased to eliminate current concentration on the fins. By doing this, it becomes possible to expect a cooling effect from the fins themselves, and as an additional effect, the surface area of the fins increases, which also increases the cooling effect.

Although the above-mentioned embodiment has been described as being applied to a breaker for a generator, it can be easily applied to other electrical equipment in which a cooling fin is attached to a current-carrying member.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of a generator shield and disconnector shown as an application example of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is an operational explanatory diagram showing a conventional cooling fin. , FIG. 4 is a front view showing an embodiment of this invention. In the figure, 1 and 2 are aluminum tanks, 3 is an insulating cylinder, 1
0, 10a, 10b are cooling fins, 11 is an outer cover,
12 is a slit. Note that the same reference numerals in the drawings indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] In a cooling fin for an electric device, the cooling fin is provided on the outer surface of the current-carrying member and is electrically connected to the current-carrying member and aligned with the current-carrying direction, wherein the cooling fin has a current-carrying direction. A cooling fin for electrical equipment characterized by having comb-like slits in a direction perpendicular to the cooling fin.