JPS59134514A - Ground connecting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grounding device used when testing a double bus type switching breaker panel.

It is generally desired that this type of device be small and easy to handle, and when installing an earthing switch in a conventional dual bus switching breaker panel, the circuits shown in Figures 1 and 2 are shown as different examples. It is often used to indicate the composition. 1st
The figure shows Ml, second buses 1i11 and 2, and each bus 1.
A wire 1 and a second busbar-side disconnecting contact 4, 5 are connected to each other at one end and can be connected to and separated from a power supply side contact terminal 3a of a circuit breaker 3, which will be described later. Second bus bar side contacts 4, 5
A load-side disconnection contact 6g that is paired with the load-side contact terminal 3b of the breaker 3 and whose load side is connected to a common one so that the load-side contact terminal 3b of the breaker 3 can be connected and disconnected.
, 6b, and the first . a second switching disconnector 9 and 10; a grounding switch 11 provided between the series connection point of the switching disconnectors 9 and 10 and the ground potential;
1st. It is comprised of a circuit breaker 3 that selectively connects and switches between the second busbar side disconnecting contacts 4 and 5 and the load side disconnecting contacts 6a and 6b.

On the other hand, the one shown in Figure 2 is a draw-out type changeover earthing switch 12.1
3, the switching disconnector 9.1 in FIG.
The configuration is such that 0 is omitted. .

In both configurations, in the example shown in FIG. 1 during testing, when the busbar side is grounded, the breaker 3 is cut off and the switching disconnector 10 is opened, and the switching disconnector 9 and the grounding switch 11 are closed. Then turn on breaker 3. In addition, when grounding the load side, the breaker 3 is cut off, the switching disconnector 9 is opened, and the earthing switch 11 is closed.2.Then, in the example shown in FIG. When grounding the side, connect the drawer type earthing switch 12 after confirming that there is no voltage on the mains A1 and 2. When grounding the load side, connect the drawer type earthing switch 13 from the breaker 3f drawer. It is designed to be grounded by pushing it in.

All of these configurations have advantages and disadvantages, and the one in Figure 1 is easy to handle because the switching disconnectors 9, 1o and the grounding switch 11 are permanently installed, but on the other hand, it requires more space as a breaker panel. Since the breaker panel is not always needed, it has the disadvantage of being large and expensive. 7 On the other hand, in the case of the one in Figure 2, the drawer-type earthing switch 12.13 is not permanently installed, so the breaker panel is smaller, but since the height of the grounding point is different, there are two types of drawer-type earthing switches 12゜1.
3 is required and the handling is troublesome. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a grounding device that eliminates the above-mentioned conventional drawbacks and is easy to handle without increasing the size of the breaker panel.

According to this invention, the above-mentioned objects are arranged above and below a vertical line of the partition wall at specific distances from the front side of the box body, respectively. A first and second bus-side disconnect contact connected to the second bus, and a second bus-side disconnect contact arranged on the vertical line between the first and second bus-side disconnect contacts and connected to the load-side cable. a load-side disconnection contact; Each of the second busbar disconnecting contacts and the load-side disconnecting contact can be connected to each other by moving up and down. In a grounding device for a double-bus type breaker panel equipped with a draw-out type breaker,
A frame body integrated with a trolley that can be pushed into the relevant location after the breaker is pulled out; An I5TwJ contact having a plug-in connection part that can be brought into contact with and separated from each of the side disconnecting contacts by advancing and retreating, and an I5TwJ contact that can be brought into contact with and separated from the fixed contact and connected to the ground potential at the relevant position. With a grounding switch that is automatically fixed at
This can be achieved by being prepared.

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 3 to 7, the above-mentioned 1. Components that correspond to the different conventional examples in FIG. 2 are designated by the same reference numerals to avoid redundant explanations, and only the different components will be explained. The structure of the breaker panel in this embodiment is the same as the example shown in FIG. 2, but the difference is that one earthing switch 207i is used as a grounding device and is configured to move up and down, allowing voltage to be applied to the front side of the breaker panel. This is because the connection conductor 21 is provided which is detachable.

The grounding device includes a frame body 22a integrated on a trolley 22 that can be inserted into the place after pulling out a breaker (not shown) from a breaker panel, and guide rails 23a and 23b provided on both sides of the frame body 22m. The main elements are the above-mentioned earthing switch 20, which is guided so as to be vertically movable, and the connecting conductor 21. The earthing switch 20 is the first. A fixed contact 20a including a plug-in contact 24 connectable to each of the second mother m-side disconnecting contacts 4 and 5 and the load-side disconnecting contact 6, and a connecting terminal 25 of the connecting conductor 21; A base 20b that supports the child 20a via the support insulator 7 and is vertically movably guided by the aforementioned guide rails 23a and 23b, and an operating shaft 20c rotatably supported by the side frame of the base 20b. It is made up of a fixed contact 20a and a movable contact 20d which are integrated into the operating shaft 20C and can be moved toward and away from each other. And the earthing switch 20 has operation@h2
A spring loading device 27 is coupled to one side of 0c via a link mechanism 26, and an operation handle 27a provided on the spring loading device 27
The earthing switch 20 is opened and closed by the rotation operation. The earthing switch 20 is also provided with an automatic position holding device @28 on its base 20d, and the first. Each of the second busbar side disconnection contact 4.5 and the load side disconnection contact 6 and the insertion contact 24 are locked in opposing positions. The automatic position holding device 28 is connected to the above-mentioned holding rail 2.
Lock hole 29a provided in 9 and lock holes 29 on both sides
Lock bin 30a3 (lb and
A lock release mechanism 31 that connects the lock bins 3tJa and 30b to each other and expands and contracts the connection length by rotating the handle 31a to remove the lock bins 30a and 30b from the lock hole 29; a double-ended lock bin 30a that is always wound around the lock bin 30b; 30b toward the holding rail 29, and a display plate 33 that allows the user to visually determine the position when the device approaches the locking position. One end of the connecting conductor 21 for the withstand voltage test is crushed into a plate shape and a through hole is drilled to form a terminal 34a, and the other end is provided with a screw hole into which a threaded rod 25a provided in the connecting terminal 25 can be screwed in in a detachable manner. It is composed of a cylindrical conductor 34 and an insulating tube 35 that covers the cylindrical part of the conductor 34, and the connecting terminal 25 has a threaded rod 25a.
One end guide support 3 that guides and supports the conductor 34 coaxially with the
An insulating guide tube 3 supported on the base 20b via 6
A lifting device 38 for the earthing switch 20 is installed between the earthing switch 20 and the frame 22a on one side of the earthing switch 20. The lifting device 38 includes a manual hydraulic jack 39 and a jack 39. The spur gear 40 is connected to the ground switch 20 so that it can move up and down and rotate, and the plug contact 24 of the earthing switch 20, which is meshed with the spur gear 40 sandwiched from both sides, is connected to the first busbar side disconnection contact 4. It is comprised of racks 41a and 41b mounted so that the frame body 22a side and the earthing switch 20 side are at the same level when facing each other. The reason for using the manual hydraulic jack 39 for the lifting device 38 is that it is small and can provide a large force, but on the other hand, it has the disadvantage of a small stroke, and to compensate for this, two racks 41a, 41
By using h, the stroke is doubled, and the structure is simple and has many advantages.

However, it goes without saying that this does not have to be the case, as long as the earthing switch 2°0 can be raised and lowered manually on the wall.
, and on the trolley 22 there is a first one that can make contact with and separate from a grounding wire contactor provided in the breaker panel. The second bus-side ground contact 42a and the load-side ground contact 42b are generally pierced. .

As described above, according to the present invention, in a double-bus type switching breaker panel from which a breaker is pulled out, the bus bar on the panel side and the load double-disconnection contactor are arranged in three stages: upper, upper, and lower. The frame on the trolley is configured to automatically fix the earthing switch at each position, and all operations can be performed from the front, and voltage application for withstanding voltage tests can also be done from the front. By providing a removable and insulated connecting conductor in the breaker panel, a grounding device power S can be obtained that can shorten test preparation time without increasing the size of the breaker panel.

[Brief explanation of the drawing]

Figures 1 and 2 are circuit configuration diagrams of different examples of conventional double-bus type switching breaker panels, and Figure 3 shows a grounding device for a double-bus type switching breaker panel according to the present invention. 4 is a sectional view taken along the line ■-■ in FIG. 3, FIG. 5 C is an enlarged sectional view of the main part along the mV-IV line in FIG. FIG. 3 is an enlarged sectional view of the main part, and FIG. 7 is a circuit configuration diagram of FIG. 3. 1.2... Bus bar, 4, 5... Bus bar side disconnection contact, 6
... Load side disconnection contact, 20 ... Earthing switch, 20
a... Fixed contact, 20d... Movable contact, 21.
...Connection conductor, 22...Dolly, 22a...Frame, 2
4... Plug-in contact, 25... Connection terminal, 28...
... Automatic position holding device 3.38 ... Lifting device, 39.
・・Manual hydraulic jack. I

Claims (1)

[Scope of Claims] 1] The first and second walls are disposed above and below a vertical line of a partition wall that is a predetermined distance from the front side of the box body. The first bus connected to the second busbar. the second bus bar side disconnection contact 7, and the first and 22nd
a load-side disconnection contact disposed on the vertical wire sent to the middle of the busbar disconnection contact and connected to the load-side cable; Grounding of a double bus type breaker panel comprising a second busbar (a drawer-type breaker that allows each of the IQ disconnection contacts and the load-side disconnection contactor to be connected to each other by vertical movement) The loading device includes a frame body integrated on a trolley that can be pushed into the relevant location after the breaker is pulled out, and a frame body that is vertically movably guided by the frame body and the first and second
A device side fixed contact having an insertion contact part that can be brought into contact with and separated from the busbar side disconnection contact and negative side disconnection contact by moving forward and backward, and a movable side contact that can be brought into contact with and separated from the fixed contact and connected to the ground potential. A grounding device comprising a grounding switch having a contact and automatically fixed at the position. 2. A grounding device according to claim 1, characterized in that a manual hydraulic jack is used to move the grounding switch up and down. 3) A grounding device M in the device according to claim 1, characterized in that the fixed contact on the @distribution side is provided with a detachable connecting conductor for applying a test voltage from the front side of the box body. .