JPH0360133B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disconnector having a grounding function for grounding a movable contact, and provides a disconnector having a grounding function that is small and has a simple configuration, and is capable of preventing erroneous operation by an operator. The purpose is to

Generally, when testing the load by opening a disconnector installed in the middle of a high-voltage circuit consisting of a busbar and a load, the load side of the disconnector, that is, the movable contact side, is grounded to ensure work safety. Conventionally, it has been done to connect a grounding rod to a grounding terminal provided near the movable contact for grounding, or to install a grounding disconnector in place of the disconnector. It is.

However, in the former case, manual grounding is done using a grounding rod, which is time-consuming, prone to erroneous operation, and is highly dangerous.In the latter case, the grounding disconnector is large and difficult to install. In addition to the increased space, especially if the grounding disconnector is equipped with an interlock mechanism to prevent erroneous operation by the operator, the size of the disconnector becomes even larger and the installation space becomes even larger.

The present invention has been made with the above points in mind, and includes a fixed contact fixed to a frame and connected to a bus bar, and a fixed contact attached to the frame so as to be movable up and down and to be able to freely contact the fixed contact. a movable contact electrically connected to a load; and an operating body for vertically moving the movable contact, one end of which is rotatably fixed to the frame and the other end connected to the movable contact. a grounding body, one end of which is rotatably attached to the frame body and the other end of which fits into the upper end of the movable contact during downward movement to be grounded; is provided to prevent upward movement of the movable contact when the grounding body is fitted onto the movable contact, and to prevent the grounding body from fitting onto the movable contact when the movable contact contacts the fixed contact. This invention provides a disconnector characterized in that it is equipped with a blocking body that prevents.

Therefore, according to the disconnector of the present invention, a grounding body is provided that fits into the upper end of the movable contact when it moves downward to ground the movable contact, and the blocking body prevents the movable contact of the grounding body from closing. By preventing the upward movement of the operating body when fitting onto the child and preventing the grounding body from fitting into the movable contact when the movable contact contacts the fixed contact, the structure is small and compact. A disconnector having a simple configuration and a grounding function can be provided, and erroneous operation by an operator can be prevented.

Next, the present invention will be described in detail with reference to drawings showing one embodiment thereof.

In the drawing, 1 indicates a horizontal plate 1a and a vertical plate 1
A frame body with an L-shaped cross section consisting of b, 2 are three insulating supports attached to the upper end of the vertical plate 1b of the frame 1, and each having a conductor 3 embedded therein, 4
5 is a three-phase busbar supported by each support 2 and connected to the upper end of each conductor 3, and 5 is fixed to the frame 1 attached to each support 2 and connected to the lower end of each conductor 3. Connected and has a recess 5' in the center of the lower side.
6 is the horizontal plate 1 of the frame 1.
Three cylindrical bodies made of insulating material penetrated through a, 7
are attached to the inside of the lower half of each cylindrical body 6 and are electrically connected to a load (not shown) by a connecting body 8, with the inner diameter of the center portion being at the top and the fitting portions 7a and 7 being at the bottom end.
A conductive cylinder 9 having a shape larger than the inner diameter of b is inserted into the inside of the cylindrical body 6 and the conductive cylinder 7, and is movable up and down to the frame 1 and freely contacting the fixed contact 5 via an operating body, etc., which will be described later. Three rod-shaped movable contacts are attached, 10 is an insulating coating film formed on the outside of each movable contact 9, 11 is integrally formed on the lower end of each movable contact 9, and 11 is formed inside each conductive cylinder 7. 12 is a guide shaft penetrating the upper end of each movable contact 9; 13 is a guide shaft of each movable contact 9; There are three operating bodies for vertical movement operation, each of which has two spatula-shaped substrates 14 disposed to face each other with each movable contact 9 narrowed therebetween, and one end of both substrates 14 is integrally formed. The attached mounting portions 15 are rotatably attached to mounting shafts 17 provided in a notch 16 formed at the center right side of the vertical plate 1b, and are attached to a length provided transparently at the other end of both substrates 14. The guide shafts 12 of the movable contacts 9 are inserted through the holes 18, respectively, and each operating body 13 is connected to each movable contact 9, respectively.

Reference numeral 19 indicates a support portion fixed to the front and rear sides of the lower right end of the vertical plate 1b, and reference numeral 20 indicates both support portions 19 at both ends.
A fixed rotating shaft 21 is rotatably supported by the fixed rotating shaft 20 at one end and connected to the operating body 1 at the other end.
Two connecting bars 22 made of a conductive material are disposed between the respective operating bodies 13 so as to be located above the connecting bars 21 , and 22 is provided through the other end of both connecting bars 21 .
The connecting shaft 23, which is a blocking body made of a conductive material and fixed to the connecting shaft 22, has one end pivotally attached to the connecting shaft 22, and a fitting hole 24, into which the upper end of the movable contact 9 is inserted during downward movement, at the other end. These are three grounding bodies made of conductive material, which are rotatably attached to the vertical plate 1b by a connecting shaft 22, a connecting bar 21, a fixed rotating shaft 20, and a support part 19.

When the energizing circuit between the bus bar 4 and the load is opened, the clockwise direction when viewed from the front centering on the mounting shaft 17,
That is, as shown in FIG.
3, the movable contact 9 moves downward linearly, and the upper end of the movable contact 9 touches the fixed contact 5.
At the same time, the conductor 11 is removed from the recess 5' of the conductor 11, and the conductor 11 is inserted into the lower fitting part 7b of the conductor tube 7, as shown in FIG.
The grounding body 23 is inserted into the bus bar 4 and the current-carrying circuit between the bus bar 4 and the load is opened, and the grounding body 23 is rotated clockwise when viewed from the front around the fixed rotating shaft 20, that is, in the direction B as shown in the figure. By fitting the upper end of the movable contact 9 into the fitting hole 24, the grounding body 2
3 is fitted onto the upper end of the movable contact 9, and the connecting body 8,
Conductive tube 7, conductor 11, movable contact 9, grounding body 2
3. The load is grounded via the connecting shaft 22 and the connecting bar 21. At this time, even if the operating body 13 is attempted to be rotated in the direction opposite to the direction A with the grounding body 23 fitted to the movable contact 9, the operating body 13 will come into contact with the connecting shaft 22, which is a blocking body, so that the operation will not be possible. If the rotation of the body 13 is prevented and the upward movement of the movable contact 9 is prevented, and the fitting state of the grounding body 23 to the movable contact 9 is not released, the movable contact 9 cannot be brought into contact with the fixed contact 5. They are mechanically interlocked by the connecting shaft 22 so that no damage is possible.

Furthermore, when the current-carrying circuit between the bus bar 4 and the load is closed, the grounding body 23 is rotated in the direction opposite to the B direction to release the fitting state of the grounding body 23 to the movable contact 9, so that the operation can be performed. When the body 13 becomes rotatable and the operating body 13 is rotated in the direction opposite to the direction A, the movable contact 9 moves upward linearly, and as shown in FIG. 3, the upper end of the movable contact 9 The part fits into the recess 5' of the fixed contact 5 and both contacts 5 and 9 come into contact with each other, and the conductor 11 fits into the fitting part 7a on the upper side of the conductive cylinder 7, thereby energizing the bus bar 4 and the load. The circuit is closed. At this time, both contacts 5 and 9
Even if an attempt is made to rotate the grounding body 23 in the direction B while the grounding body 23 is in contact with the operating body 13, the connecting shaft 22 will come into contact with the operating body 13, so the rotation of the grounding body 23 and the movable contact 9
The grounding body 23 is mechanically interlocked by the connecting shaft 22 so that the grounding body 23 cannot be fitted to the movable contact 9 unless the contact between the two contacts 5 and 9 is released. .

Therefore, according to the embodiment, the grounding body 23 is provided which fits into the upper end of the movable contact 9 during downward movement to ground the movable contact 9, and the connecting shaft 22 connects the movable contact of the grounding body 23 to the ground. The operating body 13 when fitted to the child 9
By preventing upward movement and preventing the grounding body 23 from fitting into the movable contact 9 when the movable contact 9 contacts the fixed contact 5, the grounding function is small and has a simple configuration. In addition, the mechanical interlock provided by the connecting shaft 22 can reliably prevent erroneous operations by the operator.

[Brief explanation of drawings]

The drawings show one embodiment of the disconnector of the present invention,
FIG. 1 is a cutaway front view in a certain state, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a cutaway front view in another state. 1... Frame body, 4... Bus bar, 5... Fixed contact,
9...Movable contactor, 13...Operation body, 22...Connection shaft, 23...Grounding body.

Claims (1)

[Claims] 1. A fixed contact fixed to a frame and connected to a bus bar, a movable contact attached to the frame so as to be movable up and down and in contact with the fixed contact, and electrically connected to a load; an operating body for vertical movement of the movable contact, the other end of which is rotatably fixed to the frame and connected to the movable contact; and the other end of which is rotatably attached to the frame. a grounding body that fits into the upper end of the movable contact when the part moves downward and makes contact with the ground; A disconnector comprising a blocking body that prevents upward movement of the movable contact and prevents the grounding body from fitting into the movable contact when the movable contact contacts the fixed contact. .