JPH069414Y2 - Grounding device for disconnector - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application This invention relates to a grounding device for a disconnector installed in a high-voltage, high-current power receiving unit or the like.

B. Overview of the Invention This invention is a disconnecting switch installed in a power receiving unit for high voltage and high current, etc., and is a grounding lever that rotates to a fixed contact for grounding of the disconnecting switch and contacts the blade part on the main circuit side. Providing a ground blade that integrally projects from the pivotal part of
A conductor for connecting the main circuit side blade of the grounding lever to the grounding blade is provided, and at the position where the grounding lever is connected to the grounding fixed side contact of the disconnector, the grounding side is connected to the grounding wire connected to the grounding blade. By providing the fixed contact, the main circuit side blade normally eliminates the lead wire connecting to the ground side fixed contact to simplify the structure easily, and eliminates accidents due to breakage of this lead wire, etc. It has improved reliability.

C. Conventional technology Generally, a disconnector is installed in a high-voltage, high-current power receiving unit or the like. For example, a third such power receiving unit
There is something like the one illustrated in the figure. In the figure, 2 is a vacuum circuit breaker, 4 is a grounding device for a busbar, 5 is a detection terminal for a busbar, 6 is a busbar, 9 is a disconnector for a busbar, and 10 is a cable. Head, 11
Is a disconnector operating device for busbars, 12 is an operating device for circuit breakers, 1
Reference numeral 4 is a busbar grounding device operating device, 16 is a power receiving disconnecting switch operating device, and 22 is a power receiving grounding switch operating device.

In such a power receiving unit, when performing maintenance and inspection of the vacuum circuit breaker 2 or repairing the failure thereof, the current is cut off by the vacuum circuit breaker 2 and then the power is disconnected by the disconnecting switch on the power receiving side and the bus side. At the same time, it is usual to discharge residual electric charges in the vacuum circuit breaker 2 or the condenser of the power receiving side device, etc. by the bus bar grounding device 4 to prevent an electric shock accident during work. Details of the configurations of the conventional busbar disconnector 9 and the busbar grounding device 4 used for this purpose are shown in FIGS. 4 and 5. That is, in FIG. 4, 31 is a movable contact rod, 32 is a fixed contact, 33 is a movable contact, 34 is a support insulator, 35 is an insulating lever, and 36 is a fixed contact for grounding.

Further, the busbar disconnector 9 is integrally provided with the busbar grounding device 4. That is, one end of the busbar grounding lever 38 is pivotally attached to a part of the abutment 37 to which the insulating lever 35 is pivotally attached. Further, a flexible conductor 41 is provided between the blade 39 provided at the free end of the bus bar ground lever 38 and the ground bushing 40 provided near the abutment 37.
(For example, a thin wire is flat knitted). Then, the busbar grounding lever 38 is rotated in the direction of arrow A from the grounded state shown in FIG. 4 so that the blade 39 is connected to the grounding fixed side contact 36 as shown in FIG. , To discharge.

D. Problems to be Solved by the Invention In the grounding device configured as described above, the blade 39
And a conductor 41 for connecting the grounding bushing 40,
In the state of grounding or operating for grounding shown in FIG. 4, the conductor must be cut to the minimum necessary length so that it will not come into contact with other parts and short-circuit. It is necessary to manufacture by suppressing dimensional error as much as possible,
The erection work also had to be performed with high accuracy, which was extremely difficult. In addition, the conductor 41 is bent or pulled at an acute angle each time the grounding operation is performed. For this reason, there has been a problem that the flat knitting wire, which is the conductor 41, is frayed or cut off during repeated use and the function of grounding is impaired.

In view of the above points, the present invention does not cause troubles such as impairing the grounding function even when the grounding device is used for a long time, and does not require high precision in manufacturing, and has a simple structure. , It is intended to newly provide a grounding device for a disconnector.

E. Means for Solving the Problems The grounding device of the disconnector of the present invention has an insulator (5
Ground lever with main circuit side blade (39) insulated with 3)
(38) is pivotally mounted so that the grounding lever (38) can be rotated to connect to or disconnect from the grounding fixed side contact (36) of the disconnector (9). The other free end is provided with a ground blade (52) that is insulated with an insulator (54), and a conductor (55) that connects the main circuit side blade (39) and the ground blade (52) is provided, and It is characterized in that a ground side fixed contact (57) for connecting to the ground blade is provided at a position where the ground lever (38) is connected to the ground fixed side contact (36).

F. Action With the above configuration, when the grounding lever is in the ground off state, the blade on the main circuit side of the grounding lever separates from the fixed side contact for grounding of the disconnector, and the grounding blade is also grounded. It is in a position away from the fixed contact on the ground side. When the ground lever is turned to the grounded state, the main circuit blade connects to the grounding fixed contact of the disconnector, and the ground blade connects to the grounding ground fixed contact. From the fixed contact for the main circuit to the blade on the main circuit side, it is transmitted to the ground blade by the conductor attached to it, and by this, it is connected to the fixed side contact for grounding, and thereby it has the effect of discharging to earth. .

G. Embodiment An embodiment of the grounding device for a disconnecting switch according to the present invention will be described below with reference to FIGS. 1 and 2. In FIGS. 1 and 2, parts corresponding to those in FIGS. 3 to 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the front view of FIG. 1, reference numeral 9 is a disconnector, and a grounding device is installed adjacent to this.

In this grounding device, a supporting plate 51 is erected at a position corresponding to a position below the end of the grounding fixed side contact 36 on the installation plate 50, and a grounding lever 38 is pivotally attached to its free end. The grounding lever 38 is provided with a main circuit side blade 39 in a state in which it is insulated by an insulator 53 at a free end portion that hits upward in the drawing.

Further, the grounding blade 52 is projectingly provided integrally with the pivoting portion of the grounding lever 38 in a state of being insulated by the insulator 54 so as to extend in a diagonally lower left direction in the figure, and is formed in a V shape. Further, the main circuit side blade 39 of the grounding lever 38 and the grounding blade 52 are connected by a conductor 55 formed of a rigid copper plate in a substantially V shape.

Further, at a predetermined position adjacent to the support plate 51 on the installation plate 50,
A grounding wire bushing 56 is provided, and a hook-shaped fixed contact 57 for connecting to the grounding wire is provided on the upper end of the bushing 56.
Set up. Then, with the grounding lever 38 set in the grounding position shown in FIG.
The ground side fixed contact 57 is connected to.

Next, the operation of the apparatus of this example configured as described above will be described. First, when the grounding device is off the ground, the position state shown in FIG. 2 is obtained. That is, the grounding lever 38 tilts in the horizontal direction in the figure, the main circuit side blade 39 thereof is separated from the grounding fixed side contact 36 of the disconnector, and the grounding blade 52 is also grounded.
It is in a state of disconnecting from the ground and disconnecting from 7.

Next, when the disconnecting switch 9 is grounded by a grounding device, the grounding lever 38 is moved to an arrow A in FIG.
It rotates in the direction to shift to the grounded state shown in FIG. In this state, the main circuit side blade 39 of the grounding lever 38 is connected to the grounding fixed contact 36 of the disconnector, and the grounding blade 52 is connected to the grounding side fixed contact 57. That is, the ground fixed side contact 36 is electrically connected to the main circuit side blade 39, is further conducted through the conductor 55 to the ground blade 52, and is grounded through the ground fixed side contact 57 connected thereto. It discharges along the route.

In order to shift from the grounded state to the grounded state, the grounding lever 38 is rotated in the direction opposite to the arrow A to shift the state shown in FIG. 1 to the state shown in FIG. Good.

H. Effect of the Invention As described in detail above, according to the grounding device for a disconnector of the present invention, the main circuit side blade and the grounding blade are provided at both free ends of the grounding lever pivotally connected to the intermediate portion. , These two are connected by a conductor to form an integrated structure,
With this grounding lever reaching the grounding position, the conductor is connected from the main circuit side blade connected to the grounding fixed contact of the disconnector, and the grounding blade is connected to the grounding fixed contact connected to it. , The flexible conductor that used to connect the main circuit side blade and the ground side fixed contact is no longer necessary, and the trouble caused by this flexible conductor is eliminated, and the function of grounding even after long-term use is lost. In addition, there is an effect that the structure is simplified so that high accuracy is not required when manufacturing the grounding device, and the grounding device can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a grounding device for a disconnecting switch according to the present invention, FIG. 2 is a front view of a main part thereof, and FIG. 3 is a schematic configuration diagram showing an example of a conventional power receiving unit. FIG. 5 is a front view showing an example of a conventional grounding device for a disconnecting switch used therein, and FIG. 5 is a front view of a main part thereof. 9 ... Disconnector, 36 ... Grounding fixed side contact, 38 ... Grounding lever, 39 ... Main circuit side blade, 52 ... Grounding blade, 55 ... Conductor, 57 ... Grounding side fixed contact.

Claims (1)

[Scope of utility model registration request] 1. A grounding lever (38) having a main circuit side blade (39) insulated at one free end by an insulator (53), and the grounding lever (38) pivots to disconnect the disconnector (9). ) Is connected to the fixed contact (36) for grounding so that it can be connected or disconnected, and is grounded by the insulator (54) at the other free end of the grounding lever (38) and grounded (52). And the main circuit side blade
(39) is provided with a conductor (55) for connecting the grounding blade (52), the grounding lever (38) is the fixed contact for grounding
A grounding device for a disconnector, comprising a grounding side fixed contact (57) connected to the grounding blade at a position connected to (36).