CZ11256U1 - Electric current conductor for current meter of low voltage high power fuse device or low voltage power switching device - Google Patents

Abstract

The current conductor has two parallel sections for connection to bus bar and to a contact of a pole and a perpendicular central part connecting them. The parallel and central sections are arranged in a Z-formation. The conductor can be connected to a current converter. The central part is associated with the current converter and has a cylindrical cross-section. One parallel section can be preferably removably connected to the central section. The current conductor (2) has two parallel sections (5,6), one for connection to a bus bar (5) and the other to a contact (16) of a pole, and a perpendicular central part (7) connecting them. The parallel and central sections are arranged in a Z-formation and the conductor can be connected to a current converter (17). The central part is associated with the current converter and has a cylindrical cross-section and one of the two sections can be preferably removably connected to the central section. Independent claims are also included for the following: a housing for a protection device or a protection/load switching device.

Description

Technical field

The invention relates to a conductor of a low-voltage high-power fuse device or a low-voltage power switching device with two parallel sections, one section being connectable to the busbar and the other a pole contact section, and a central section extending at right angles to these sections; these sections connecting, wherein the sections and the central part are approximately Z-shaped, and wherein the electric conductor is connectable to the current converter, as well as a housing with such an electric conductor.

BACKGROUND OF THE INVENTION

If conventional low-voltage high-power fuse devices or low-voltage power switching devices are to be equipped with current converters, there is a problem that they have to be arranged in the current circuit from the contact heads of the poles to the terminals. circumference surrounding.

EP-A-455 589 discloses a pedestal for a current converter provided with a low-voltage high-power fuse device or a low-voltage power switching device having an electrical conductor according to the introduction. In this case, the central part of the electric conductor is so shortened that sufficient space is provided inside the housing between the lower section of the electric conductor assigned to the busbar and the busbar to provide sufficient space for the current converter. The lower section of the electric conductor is screwed to the busbar in such a way that the screw is guided through the annular core of the current converter and in this way forms the primary winding. In this embodiment, it is problematic that the current conductor of low voltage high-power fuse devices or low voltage power switching devices flows with currents of up to 1000 Amps and that the screws in this context form a weak point in the current circuit because screws with electrically conductive materials such as aluminum or copper and their alloys, although they cope with these high currents, but do not have sufficient mechanical strength to screw the electrical conductor to the busbar. On the other hand, steel screws would have the necessary mechanical strength, but not the required short-circuit resistance.

The essence of the technical solution

The basis of this technical solution is therefore to develop an electric current conductor of the kind mentioned at the outset so that the current transducer can grip in the housing without any problems, but also to ensure the necessary mechanical strength and short-circuit resistance.

This object is achieved by an electric current conductor with the features of claim 1.

In the technical solution, the electric conductor is carried out in such a way that the central part assumes the function of the primary conductor in the current converter. The problem that the current converter must be arranged around this central part, but at the same time, if possible, should not change the standard dimensions of the upper and lower sections of the electric conductor, is solved by carrying the electric conductor at least in two parts, preferably a section associated with the busbar, detachably connected to the central portion.

In principle, it is possible to connect the section to the central part in a non-detachable manner, e.g. However, it is advantageous if the section is connected to the central part in a detachable manner, for example if it is screwed on, since only the inverter must be replaced in the event of a defect, which is a cheaper variant.

-1 CZ 11256 Ul

The cylindrical central part represents the best embodiment from the electrical point of view, and it is preferred that the central part is a solid cylinder. Deviations from cylindrical shape, resp. however, they are possible without departing from the scope of the present invention, if, for constructional reasons, it seems advantageous in individual cases.

The object of the invention is furthermore a case with the features of claim 8.

In this case, the central part has a length which corresponds approximately to the height H of the housing or the housing. a recess in a housing in which the electric current conductor is connected with the current converter.

In an alternative embodiment, in which the section of the electric current conductor has an arm diverted at an angle to the central portion, the sum of the lengths of the diverted arm and the central portion is a sum corresponding approximately to the height H of the housing or the housing. recesses in the housing. This makes it possible to integrate the inverter into the housing without changing the standard housing height H.

Overview of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an oblique view of a housing section of a low voltage high power fuse device or a low voltage power switching device, FIG. 2 is a sectional view of the housing in the area of the power conductor, FIG. Fig. 4 is a view similar to Fig. 3 but without a current converter; Fig. 5 is a side view (front view) of the power conductor and the current converter; and Fig. 6 is a side view of the current converter. Fig. 5.

Examples

1 shows a part of the housing J in an oblique view, in which, in the region of the conductor 2, an electric current or an electric current 2 is shown in FIG. busbar 3, one side wall broken. The electric conductor 2 provided in the recess 4 in the housing 1 has, as is best seen in FIGS. 3 to 6, approximately Z-shaped and consists mainly of the upper section 5, the lower section 6 and the middle section 7 arranged parallel thereto. which connects the upper section 5 and the lower section 6 to each other.

The middle section 7 is a solid cylinder having on its front side facing the lower section 6 two threaded holes 8, to which two aligned bores 9 are assigned in the lower section 6. screw together so as to form a press fit between the central part 7 and the lower section 6, also suitable for higher currents.

The upper section 5 has an angled arm 11 towards the middle part 7, the end 12 of which is engaged in a notch 13 in the middle part 7. To firmly connect the arm 11 to the middle part 7, they are flapped at the edges 13 '.

The housing 1 has, as shown in FIG. 2, the height H and the middle portion 7 and the arm Ji which represents the extension of the middle portion 7 together have a length which corresponds approximately to the height H of the housing and in particular the recess 4.

Naturally, it is also possible for the central part 7 itself to have a length corresponding to the height H and to be directly connected to the upper section 5.

Sections 5 and 6 have a cross section that is common to electrical conductors of low-voltage high-power fuse devices or low-voltage power switching devices. Due to the limited space conditions in the recess 4 in the housing 1, however, the smallest current transducers 14 as shown in FIGS. 1, 3, 5 and 6 must be used. Therefore, the bore diameter of the annular core of the current transducer 14 will usually be smaller than the width of the conductor 2. so that the central part 7 must also have a correspondingly smaller diameter than the width of the conductor

-2GB 11256 UI of electric current. In order to avoid any restriction at the height of the middle part 7 corresponding to the height of the current converter 14, the end 12 of the arm 11 inserted in the middle part 7 must not be larger than the diameter of the middle part 7. To avoid this problem, naturally, the height of the middle part 7 also by that value greater than the height of the current converter 14 by which the end 12 is inserted into the middle part 7.

As can be seen in the figures, the lower section 6 is further connected by screws 15 to the busbar 3, and this connection can be made as is conventional in the art.

Also, according to the state of the art, the upper section 5 of the electric conductor 2 is connected to a contact head 16, which engages a contact knife, e.g. fuses. Another contact knife of the fuse 10 is retained in the contact head 17, which, however, can be seen in FIG. 1 without the corresponding current conductor.

List of reference marks:

1 2 housing electric current conductor 15 Dec 3 Connection nice 4 recess 5 upper section 6 lower section 7 middle part 20 May 8 tapped hole 9 bore 10 screw 11 shoulder 12 end of arm 25 13 notch 13' edge 14 current converter 15 Dec screw 16 contact head 30 17 contact head H height.

Claims (10)

PROTECTION REQUIREMENTS 1. Low-current, high-voltage fuse device or low-voltage power switching device with two parallel sections (5, 6), 35 of which one section (6) is connectable to a busbar (3) and the other section (5) is a pole contact (16) and a central portion (7) extending at right angles to these sections (5, 6) and connecting the sections (5, 6), the sections (5, 6) and the central part (7) being approximately Z-shaped, and wherein the electric conductor (2) is connectable to the current converter (14), that the central part (7) is associated with the current converter (14) and has a cylindrical cross section, and that At least one section (6) of the two sections (5, 6) is connected, preferably releasably, to the central part (7). Electric current conductor according to claim 1, characterized in that the central part (7) is a solid cylinder. -3 GB 11256 U1 Electric current conductor according to claim 1 or 2, characterized in that the central part (7) is screwed to the section (6). Electric current conductor according to one of Claims 1 to 3, characterized in that the section (5) is welded or soldered to the central part (7). 5 is preferably engaged in a notch (13) on the front surface of the center (7) and is welded or soldered thereto. Electric current conductor according to one of Claims 1 to 4, characterized in that the section (5) has an angled arm (11) which is connected to the central part (7) at an angle. Electrical current conductor according to one of Claims 1 to 5, characterized in that the width of the section (5, 6) is greater than the diameter of the central part (7). Electrical current conductor according to claims 5 and 6, characterized in that the arm 10 (11) of the upper section (5) engaged in the notch (13) of the central portion (7) is not wider than the diameter of the central portion (7) in the region in which it is received in the notch (13). 8. A housing of a low voltage power switching device having a number of recesses (4) having a height (H) corresponding to the poles of the power switching device, within which a current conductor (2) and a current converter (14) are received. ) The electric current 15 is formed according to any one of claims 1 to 7. Housing according to claim 8, characterized in that the length of the middle part (7) corresponds to the height (H). Housing according to claim 8, characterized in that the sum of the lengths of the middle part (7) and the arm (11) corresponds to the height (H).