JPH069030U - Grounding device - Google Patents

Abstract

(57) [Abstract] [Purpose] When the grounding blade is turned to the grounded state, the electromagnetic force generated in the grounding blade causes the grounding blade to reversely rotate to the non-grounded state, and thus solves this problem. [Structure] The ground blade 1 is provided while the fixed terminal 16 is provided.
8 is provided, and the ground blade 18 is changed from “OFF” to “ON”
The counterclockwise rotation direction at the time of setting is set to be the same as the counterclockwise rotation direction received by the ground blade 18 by the electromagnetic force generated by the current flowing from the fixed terminal 16 to the ground blade 18.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a grounding device, which prevents a grounding blade rotated for grounding from rotating backward.

[0002]

[Prior art]

 The substation is equipped with a disconnector with a grounding device that combines a grounding device and a disconnector. The structure of the disconnector with a grounding device is shown in FIG.

As shown in the figure, a frame 4 is formed by a pair of frame 1, frame 2 and frame 3, and U-shaped holding metal fittings 5 for three phases are provided on the frame 2 via insulators 6, respectively. It is attached. Then, fixed contacts 7 connected to cables (not shown) are mounted in the respective holding fittings 5. On the other hand, bushings 8 for three phases are attached to the frame 3, and movable contacts 10 are movably provided to each terminal 9 via ring contacts (not shown) in the bushings 8. Then, a base end portion of a lever 12 for three phases is fixed to a rotation shaft 11 rotatably provided on the pair of frames 1 for driving the movable contact 10. Two levers 12 are provided for each phase, and both ends of a pin 13 fixed to the movable contact 10 are loosely fitted in an elongated hole 14 formed at the tip of the lever 12. The rotating shaft 11 is interlockingly connected to a driving means (not shown).

Besides, a base end portion of the ground blade 15 for three phases is fixed to an operation shaft (not shown). The grounding blades 15 are respectively inserted between the pair of levers 12, so that the tip can be brought into contact with the movable contact 10 only when the movable contact 10 is not connected to the fixed contact 7 in the disconnection state. Only the tip of the ground blade 15 is wider than the distance between the pair of levers 12 to form a branch (not shown).

In such a disconnector with a grounding device, when the lever 12 is at the position of the chain double-dashed line and the movable contact 10 and the fixed contact 7 are connected, the grounding blade 15 is at the position of the chain double-dashed line. Since the tip of the ground blade 15 is smaller than the distance between the pair of levers 12, it cannot be brought into contact with the movable contact 10. The ground blade 15 can be rotated by turning the lever 12 to the position shown in the figure to bring it into a disconnected state, and the tip of the movable contact 10 is pinched by the branching portion of the tip of the ground blade 15 to ground. It becomes a state.

When the current i flows in the direction shown by the arrow in FIG. 4 in the grounded state, the current flowing through the movable contact 10 causes the grounding blade 15 to be positioned in the magnetic field from the back side of the paper to the front side, which causes Due to the left-hand rule, a force F is applied to the ground blade 15 at right angles to its length. The force F increases as it approaches the movable contact 10. For this reason, the grounding blade 15 is subjected to a moment of reverse rotation, which is the opposite of that during the grounding operation, and a locking mechanism (not shown) is provided to prevent reverse rotation.

[0007]

[Problems to be solved by the device]

 However, it is troublesome that the lock mechanism must be released at the same time as the ground blade is rotated in the reverse direction to release the grounded state. For example, in the case of a mechanism that electrically operates the grounding blade, the lock mechanism may be automatically released by the operation of releasing the grounding, or the grounding blade can be rotated in the reverse direction by an external force from the output shaft side. It is necessary to use a speed reducer with a self-lock function.

[0008] Therefore, an object of the present invention is to provide a grounding device that solves such a problem.

[0009]

[Means for Solving the Problems]

 The structure of the present invention for achieving such an object is a grounding device in which a fixed terminal is provided, while the tip end of a ground blade rotatable about a base end is configured to be contactable with and separated from a fixed terminal. It is characterized in that the rotating direction of the grounding blade when grounded and the direction in which the grounding blade tries to rotate by the electromagnetic force generated in the grounded state are set to be the same.

[0010]

[Action]

 When the grounding blade is turned in one direction to turn on the grounding device, electricity flows from the fixed terminal to the grounding blade and electromagnetic force is generated in the grounding blade. The turning moment caused by the electromagnetic force acting on the grounding blade is the same as the turning direction when the grounding blade is turned when the grounding device is turned "ON". Therefore, unlike the conventional case, the grounding blade does not reversely rotate due to the electromagnetic force, and the lock mechanism or the like is unnecessary.

[0011]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. Since the present embodiment is an improvement of a part of the conventional disconnecting switch with a grounding device, the same parts as those of the prior art are designated by the same reference numerals, and the description thereof will be omitted. Only different parts will be described.

The structure of the disconnecting switch with a grounding device according to the present invention is shown in FIGS. Conventionally, the ground blade was attached so as to intersect with the lever for operating the movable contact, but in the present invention, the ground blade is provided separately from the lever. That is, while the fixed terminal 16 connected to the terminal 9 is attached to the bushing 8, the operation shaft 17 is provided below the fixed terminal 16 in a rotatable state on the frame 1, and the operation shaft 17 has a pair of grounding terminals. The base end of the blade 18 is fixed for three phases. Grounding is performed by holding the fixed terminal 16 between the tip portions of the pair of grounding blades 18. A lever 19 is fixed to the end of the operating shaft 17 at a right angle to the operating shaft 17, and the tip of the lever 19 is interlocked with a driving means (not shown) via a rod 20. The grounding blade 18 turns “ON” when it is rotated about 90 ° counterclockwise from the “OFF” position indicated by the chain double-dashed line, and the grounding blade 18 does not rotate counterclockwise from the “ON” position. Thus, while the lever 21 is fixed to the operation shaft 17, a stopper 22 with which the front end of the lever 21 abuts is fixed to the frame 1.

As described above, since a counterclockwise rotating moment is applied to the grounding blade 18 by the electromagnetic force, the rotating direction (counterclockwise direction) of the grounding blade 18 when grounding and the grounding blade 18 The electromagnetic force generated by the flow of the electric current to the ground blade 18 becomes the same as the direction in which the ground blade 18 is rotated. For this reason, a lock mechanism or the like that locks the ground blade 18 so as to prevent the grounding device from rotating backward and turning "OFF" is not required. On the other hand, an electromagnetic force acts to rotate the ground blade 18 counterclockwise, but the stopper 22 acts to prevent the ground blade 18 from rotating, so that no problem occurs.

Although the present embodiment has described the disconnector with a grounding device as an example, it goes without saying that the presence or absence of the disconnector does not pose a problem.

[0015]

[Effect of device]

 As can be seen from the above description, according to the grounding device of the present invention, the rotation direction of the grounding blade when grounding is the same as the rotation direction of the grounding blade due to the electromagnetic force generated by the current flowing through the grounding blade, so the grounding blade is grounded. The locking mechanism that locks the grounding blade so that the grounding blade does not turn off and the grounding device does not turn off due to the electromagnetic force generated when the condition is set is not required. Therefore, the number of parts of the grounding device is small, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a disconnector with a grounding device showing an embodiment of a grounding device according to the present invention.

FIG. 2 is a perspective view showing a part of a disconnector with a grounding device according to an embodiment of a grounding device according to the present invention.

FIG. 3 relates to a conventional disconnector with a grounding device, FIG. 3 (a) is a plan view, and FIG. 3 (b) is a front view.

FIG. 4 is an explanatory diagram of electromagnetic force.

[Explanation of symbols]

 16 ... Fixed terminal 17 ... Operation shaft 18 ... Ground blade

Claims (1)

[Scope of utility model registration request] 1. A grounding device in which a fixed terminal is provided, and a distal end of a grounding blade that is rotatable about a base end is configured to be movable toward and away from the fixed terminal. And a direction in which the grounding blade is about to rotate due to an electromagnetic force generated when the grounding state is set.