JPS6224910Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a fixed electrode member in which a plurality of common electrodes electrically connected to each other in parallel and branch electrodes forming a pair for each of these common electrodes are embedded in a common mold insulator. The present invention relates to a multi-circuit switch including a movable electrode that opens and closes by connecting and disconnecting a pair of common electrode and branch electrode.

As is well known, miniaturization of power distribution equipment has been a trend in recent years, and in order to miniaturize multi-circuit switches in particular, it is necessary to reduce the spacing between electrodes by using a molding technique for an insulator in which each electrode is buried.

It is necessary to solve the problem of withstand voltage by reducing the distance between the electrodes, and therefore various measures have been taken to improve the creepage insulation distance between the electrodes.

In this way, a multi-circuit switch that can withstand a predetermined voltage has been obtained, but due to the reduction in the spacing between common-mode electrodes that arises due to miniaturization, there is a problem in that induced voltage is generated in the electrodes that are in an open circuit state. It was hot.

Generally, it is possible to check whether the electrode is in an open state or not by visually observing the electrode or by displaying it on a display, but if an electrode close to the electrode to be checked is in a charged state, It is dangerous to perform work only after checking the battery, so it is common for workers to use a voltage detector to check whether the battery is charged or not before starting work.

However, if an induced voltage is generated even though the circuit is open as described above,
The voltage detector may mistakenly operate as a charging state.
Work efficiency will be significantly reduced.

This problem becomes more prominent as the power distribution voltage increases, and needs to be solved as soon as possible from the standpoint of safety management.

Conventionally, in order to reduce the induced voltage from adjacent electrodes when an electrode is in an open state as described above, grooves are formed in the molded insulator between the electrodes, and the surface of the grooves is treated to be conductive. It has been proposed to shield this by grounding it.

However, forming such grooves is extremely difficult as the spacing between electrodes tends to become narrower due to miniaturization, and if the grooves are formed deep, there is a risk that most of the diameter of the electrodes will be exposed. There is a restriction on the depth of the capacitor, which makes it impossible to sufficiently reduce the induced voltage, and it cannot be said to be an effective means when used at high voltages.

The present invention solves the above-mentioned problems of the conventional technology,
The object of the present invention is to provide a multi-circuit switch of this type with a shield electrode, which can reliably reduce the induced voltage between adjacent electrodes to a non-hazardous value and is easy to manufacture.

That is, the multi-circuit switch according to the present invention includes a shield electrode for electrically shielding between the common electrode and the branch electrodes, which are arranged in a common molded insulator and connected to each other by movable electrodes. It is characterized by being embedded in a molded insulator with a portion exposed on the surface.

This will be explained below with reference to the attached drawings.

In the figure, reference numeral 1 denotes a common electrode, in which a plurality of common electrodes are arranged in parallel and electrically connected to each other by bus bars 2. Reference numeral 3 denotes branch electrodes provided in pairs with each of the common electrodes 1.

These common electrodes 1, busbars 2, and branch electrodes 3 are integrated by a molded insulator 4 coated with the common electrode 1 and branch electrode 3 facing each other at a predetermined interval. This constitutes the fixed electrode member 5.

Reference numeral 6 denotes a movable electrode that is detachably connected to the common electrode 1 and branch electrode 3 to open and close the gap between the electrodes 1 and 3, and is covered and protected by a molded insulator.

In this embodiment, in order to reduce the width of the switch and make it more compact, as is clear from FIG. They are placed facing each other at an angle. Therefore, common electrode 1
The spacing between the inter-electrode bridging bus bar 2 and the branch electrode 3 becomes smaller, and even if the withstand voltage is sufficient, a high voltage is induced in the branch electrode 3 due to induction from the common electrode 1 side.

Incidentally, when applied to a 6.6KV system distribution line, the ground voltage applied to busbar 2 (approximately 6.6KV/3)
On the other hand, a voltage of several hundred volts is induced in the branch electrode 3. Although it is possible to reduce voltages as high as this by using conventional conductive grooves, for example, for distribution voltages such as 22KV, depending on the groove, the induced voltage cannot be sufficiently reduced. It cannot be reduced to

According to the present invention, as shown in FIGS. 2 to 4, a part of the shield electrode 10 is formed in the molded insulator 4 between the pair of common electrodes 2 (busbars 2) and branch electrodes 2. It is buried so that it is exposed on the surface. For example, as shown in FIGS. 5 and 6, such a shield electrode 10 is made of a corrugated metal wire and is embedded in the insulator 4 by integrally molding it, and is grounded by an appropriate means. In this embodiment, the shield electrode 10 is formed into a waveform in the vertical direction between the bus bar 3 and the branch electrode 3, and in the horizontal direction in order to stabilize the shield electrode 10 in other areas.

FIG. 6 shows another example of the shield electrode 10,
It is made by drilling holes in a metal plate.

By exposing a portion of the shield electrode 10 to the surface in this way, the exposed portion can be used to mold the insulator 4 while positioning and fixing the electrode. It can be embedded and integrated into an insulator while maintaining an accurate position without moving during molding.

Furthermore, the shield electrode 10 exposed in this manner makes grounding very easy. Furthermore, although a ground layer (metallicon) is applied to the surface of the mold insulator 4, electrical conduction between this and the shield electrode 10 can be very easily achieved by using the exposed portion as described above. be.

According to the multi-circuit switch of the present invention in which the shield electrode is buried as described above, even when the distribution voltage is very high, for example, about 22 KV, the high voltage applied to the common electrode side, especially the bus bar 2, The induced voltage on the branch electrode 3 can be reduced to very low values.

Furthermore, since the fixed electrode member 5 is thin, the material used for the shield electrode 10 must not be one that would be deformed by high heat during molding of the insulator 4; If deformation occurs, not only will it be impossible to obtain the desired shielding effect, but there will also be a danger of contact with the common electrode or branch electrodes. In addition, it is desirable that the volume of the shield electrode insulator be small, so that stress within the fixed electrode member does not increase due to differences in thermal expansion coefficients of the insulator, electrode, etc. It is desirable to have one that has certain shortcomings.

As explained above, the multi-circuit switch of the present invention is capable of reliably reducing the induced voltage between adjacent electrodes to a non-hazardous value by the buried shield electrode, and also:
Since a part of the shield electrode embedded in the mold insulator is exposed on the surface, by positioning and fixing using the exposed part, it can be reliably embedded in a predetermined position without moving during molding, It is possible to easily manufacture a device that reliably achieves the effect of reducing induced voltage, and grounding is also very simple. etc., are of great practical benefit.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the multi-circuit switch of the present invention, in which Fig. 1 is a plan view of a fixed electrode member and a movable electrode, Fig. 2 is a sectional view taken along the line - of Fig. 1, and Fig. 3 is a cross-sectional view taken along the line - of Fig. 1. A sectional view taken along the line - in FIG.
Figure 4 is a sectional view taken along the line - in Figure 1;
The figure is a sectional view taken along the line - in FIG. 1, and FIGS. 6 and 7 are views showing two examples of shield electrodes. 1: common electrode, 2: bus bar, 3: branch electrode,
4: molded insulator, 5: fixed electrode member, 6: movable electrode, 10: shield electrode.

Claims (1)

[Claims for Utility Model Registration] 1. A plurality of common electrodes that are electrically connected to each other and arranged in parallel, and branch electrodes that are connected to each other in pairs via movable electrodes and are insulated by a common mold. In the fixed electrode member buried in the body, a shield electrode for electrically shielding between the common electrode and the branch electrodes is buried in the molded insulator with a portion exposed to the surface. Features a multi-circuit switch. 2. The multi-circuit switch according to claim 1, wherein the shield electrode is a perforated metal plate. 3. The multi-circuit switch according to claim 1, wherein the shield electrode is a metal wire having a corrugated shape.