JPH0430748Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a multi-circuit switch used when distributing power distribution cables in multiple directions, and is particularly useful when performing voltage detection on each distributed cable. The present invention provides a multi-circuit switch with a useful voltage testing section.

[Conventional technology]

Distribution cables pulled out from a distribution substation are distributed in a plurality of directions via multi-circuit switches, and each of the distributed cables is turned on or off by operating the multi-circuit switch.

By the way, when performing electrical work on a power distribution system, it is necessary to confirm whether or not the cable system to be worked on is live.

Conventionally, in order to check whether a voltage is applied to a cable and the cable is in a live state, a voltage detector is connected to a voltage detection part at the connection part of the cable to a device.

[Problem that the invention attempts to solve]

In the above example, since this type of power distribution system is an underground power distribution line, there are cases where the cable section becomes dirty or has condensation, making it impossible to perform accurate voltage detection.

In addition, since multi-circuit switches are installed on public roads above ground, they are becoming more compact, and as a result, the spacing between each electrode, which is the switching section, is narrowed, so the electrodes in the open state are close together. An induced voltage is generated due to the presence of the electrode in the closed circuit state, and this causes the voltage detector to indicate that the cable system is in the charged state when detecting the voltage in the cable system that is in the open circuit state, leading to incorrect judgment by the operator. There were cases where the worker was unable to perform the work accurately.

In view of the problems of the prior art, the present invention focuses on the fact that a multi-circuit switch is installed in a sealed box and in a good environment, and provides the switch with a voltage testing section. We have found that the best results can be obtained by doing this.

[Means for solving the problem] Based on the above viewpoint, the present invention provides a plurality of mutually conductive common electrodes and a plurality of independent electrodes forming a pair for each pole of the common electrode on a common solid insulator. In the embedded fixed electrode structure, a pair of conductive layers are provided in the solid insulating part between the common electrode and the independent electrodes, facing each other and separated from each other in the conductive sections of these two electrodes, so that the conductive layer on the common electrode side The layer is a ground potential layer, and the conductive layer on the independent electrode side is a non-ground potential layer.

[Effect]

In the multi-circuit switch with the above configuration, the independent electrode and common electrode that connect the cable drawn out from the substation and the multiple cables on the branch side can be opened or closed by attaching and detaching the movable electrode for each pair. However, in both the common and independent electrodes that are in a closed circuit state, an induced voltage is generated in the electrically conductive layer on the charged independent electrode side, so this electrically conductive layer and
By connecting both terminals of a voltage detector to another grounded conductive layer, it is possible to check the voltage application state of the cable.

If we now pull out the movable electrode and look at the open-circuited pair of common independent electrodes, even if the common electrode is charged due to connection and conduction with the other independent electrodes, the conductive layer on the common electrode side is at ground potential, so to speak. Since it constitutes a weak layer, almost no induced potential is generated in the open independent electrode facing it and the non-grounded conductive layer between them. At this time, it can be confirmed that no voltage is being applied to the cable by detecting the potential state with a voltage detector that is in contact with both of the pair of conductive layers.

〔Example〕

This will be explained below with reference to the drawings.

In the figure, 1 indicates a plurality of independent electrodes 2, 2,
2 and the same number of common electrodes 3, 3, 3 are embedded in a solid insulator 4 by epoxy molding or the like to form a fixed electrode assembly, and 10 indicates a movable electrode.

Each independent electrode 2 of the fixed electrode 1 is composed of an electrode rod 2B having a female contact 2A such as a tube contact at the upper end and a cable connection terminal 2C at the lower end, and the electrode rod 2B is made of a solid insulator. 4, the female contact portion 2A at the upper end is disposed within a cylindrical shape 4A formed on the upper surface of the solid insulator 4, and the cable connection terminal 2C is exposed.

On the other hand, each common electrode 3 is connected to the lower end of an electrode rod 3B having a female contact portion 3A such as a tube contact at the upper end via a common bus bar 5, so that each electrode 3, 3, 3 is electrically conductive to each other. be done. The common electrode 3 is connected to the electrode rod 3B together with the common bus bar 5.
is in the solid insulator 4, and the upper female contact 3A is disposed in a cylindrical portion 4B on the upper surface of the solid insulator 4.

The independent electrodes 2, 2, 2 and the common electrodes 3, 3, 3 are arranged alternately on the same axis and directed to the solid insulator 4 in consideration of thinning. It forms a pair with two common electrodes 3. Therefore, there are three pairs in the drawing.

The distribution cable pulled out from the distribution substation is terminated at the terminal 2C of one of the independent electrodes 2, and then terminated at the terminal 2C of the remaining independent electrodes 2, 2.
The branch cable is connected to C and 2C.

The movable electrodes 10 are prepared by the number of independent electrodes 2 and common electrodes 3, and have a pair of male contacts 11,1.
1 are bridged by a common bus bar 12, and these are disposed within a solid insulator 13 made of epoxy mold or the like. The solid insulator 13 has a cylindrical portion 13A in which a pair of male contacts 11, 11 are exposed and a common bus bar 12 is embedded.

Such a movable electrode 10 has a pair of male contacts 11, 11 inserted into female contacts 2A, 3A of adjacent independent electrodes 2 and one common electrode 3, and a cylindrical portion 4.
By inserting A and 4B into the cylindrical portion 13A, the poles 2 and 3 are closed, and by pulling them out from this state, the poles 2 and 3 are released.

In the drawing, a fixed electrode structure 1 and a movable electrode 10 for one phase are shown. Therefore, if it is R phase,
S-phase and T-phase fixed electrode assemblies and movable electrodes are prepared and housed in a sealed chamber in parallel.

A conductive layer 6 having a ground potential is provided on the circumferential surface of the substrate portion 4B of the solid insulator 4, and is electrically isolated from the high-voltage conductive portion of the adjacent solid insulator. A conductive layer is also applied to the outer peripheral surface of the solid insulator 13 of the movable electrode 10 to provide electrical insulation from an external high-voltage potential section.

Now, as described above, the solid insulator portion 4B around each independent electrode 2, 2, 2 of the fixed electrode rod structure 1, which is opened or closed by attaching and detaching the movable electrode 10, has cylindrical grooves 7, 7, 7. is provided, and this groove 7
Accordingly, the electrode rods 2 of the independent electrodes 2 adjacent to each other
B and the electrode rod 3B of the common electrode 3 and the common bus bar 5
A void is provided to separate the

Conductive layers 8 and 9 are applied to opposite surfaces of the groove 7 with a gap in between. The conductive layer 8 on one side of the common electrode 3 is connected to the conductive layer 6 provided on the peripheral surface of the solid insulator and has a ground potential, and the other independent electrode 2
The conductive layer 9 on the side is separated from the conductive layer 8 and the conductive layer 6 applied to the peripheral surface of the solid insulator with a gap therebetween, and is at a non-ground potential.

These conductive layers 6, 8, and 9 can be formed by coating with conductive paint or by attaching a plate-like metal material. The conductive layers 8 and 9 can also be embedded within the solid insulator 4.

The non-ground potential conductive layer 9 is located close to the electrode rod 3B of the common electrode 3 and the common bus bar 5, but is electrically suppressed by the ground potential conductive layer 8 between them. No voltage is generated by induction from the three common electrodes. However, the movable electrode 1
0 is attached and the independent and common electrodes 2 and 3 are closed, as shown in FIG.
The solid insulator 4 between the conductive layer 9 and the non-grounded conductive layer 9 acts as a capacitor 11, and an induced voltage can be generated in the conductive layer 9. Therefore, by bringing the terminal of the voltage detector 20 into contact with the conductive layer 9 and the conductive layer 6 on the circumferential surface of the solid insulator, which is at ground potential, for example, it can be confirmed whether the circuit is open or closed.

Incidentally, it is also possible to provide in advance terminals electrically connected to the non-grounded conductive layer 9 and the grounded conductive layers 6 and 8, respectively, to facilitate connection of a voltage detector or a lead wire.

[Effect of idea]

According to the multi-circuit switch of the present invention, by having a non-grounded conductive layer that generates an induced voltage from the electrode in relation to the electrode in each cable system, it is possible to confirm the open/closed state of the cable system. voltage detection can be carried out without touching the cable directly, and it also reliably prevents induction of adjacent electrodes in the live parts. It is electrically shielded so that only the necessary electrodes are guided, thus preventing erroneous judgments and performing accurate voltage detection.

[Brief explanation of drawings]

The attached drawings show an embodiment of the multi-circuit switch of the present invention, and FIG. 1 is a plan view of the fixed electrode structure;
FIG. 2 is a cross-sectional front view showing the cross section of the fixed electrode assembly and the movable electrode at the first X-X line, FIG. 3 is a bottom view of the fixed electrode assembly, and FIG. 4 is the one shown in FIG.
- Enlarged sectional view of the fixed electrode structure at the y line section, No. 5
The figure is a simplified diagram showing only the conductive part of the fixed electrode structure shown in FIG. 4. 1...Fixed electrode structure, 2...Independent electrode, 3...
Common electrode, 4... Solid insulator, 5... Common bus bar, 6, 8... Conductive layer (ground potential), 9... Conductive layer (non-ground potential), 10... Movable electrode, 20...
Voltage detector.

Claims (1)

[Scope of utility model registration request] A fixed electrode structure comprising a plurality of mutually conductive common electrodes and a plurality of independent electrodes provided in pairs for each pole of the common electrodes, each embedded in a common solid insulator; A common electrode and a plurality of movable electrodes that are attached and detached between the poles of the independent electrodes, and a solid insulator between the common electrode and the independent electrodes in the fixed electrode structure are provided with conductive portions of the two poles. A pair of conductive layers facing each other and separated from each other are provided, the conductive layer on the common electrode side serving as a ground potential layer, and the conductive layer on the independent electrode side serving as a non-ground potential layer. A multi-circuit switch with a voltage detection section.