JPH0252813B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an abnormality detection device for electrical equipment, and more specifically, the present invention relates to an abnormality detection device for electrical equipment. This invention relates to an abnormality detection device for electrical equipment that detects and displays information using vibrations propagating to an outer wall.

Conventionally, high-voltage equipment is housed together with insulating gas in a sealed container, and in electrical equipment that is used in combination, it is difficult to see from the outside if an abnormality occurs in the equipment, such as an internal discharge or an internal circuit accident. This made it extremely difficult to detect abnormalities early. It has been found that vibrations are generated on the outer wall of the container when such an abnormality occurs, and a detection device that utilizes this vibration has been proposed. FIG. 1 shows a conventional detection device of this type.

In the figure, a limit switch 3 is provided on the upper part of the body 1 to send an electric signal to a lid 2 connected by a threaded portion 1a, and a circumferential groove 4a inside the body 1 is provided.
A cylindrical mover 4 having a shape is housed therein. A pair of leaf springs 6 whose peripheries are clamped and fixed by the body 1, the lid 2, and the spacer 5 have cutouts 6b radiating from the center hole 6a as shown in FIG. 2, and the diameter d of the center hole 6a. is smaller than the diameter D of the mover 4, and the periphery of the center hole 6a is in pressure contact with the circumferential groove 4a of the mover 4. The body 1 is fixed to the container 7 of the electrical equipment main body with bolts 8. With such a configuration, an abnormality may occur in the electrical equipment inside the container 7,
When the outer wall of the container 7 vibrates, this vibration propagates from the body 1 to the leaf spring 6, causing the mover 4 to vibrate. Since the diameter D of the movable element 4 is larger than the inner diameter d of the center hole 6a of the leaf spring 6, the leaf spring 6 is in contact with the movable element 4 at angles θ ₁ and θ ₂ . By keeping all the angles of the leaf springs 6 in the same direction, the movable element 4
is narrowed by the leaf spring 6, and cannot move or generate relative displacement unless the leaf spring 6 is expanded. When this mover 4 vibrates, the first
In the figure, when moving in an upward direction, if the force exceeds the force that expands the leaf springs 6, it will move upward, and if a force in the opposite direction is applied, the leaf springs 6 will narrow the movable element 4, and the mover 4 will not move. When such an operation is repeated, the movable element 4 moves upward little by little, and finally the limit switch 3 is pressed to change the contact, and an abnormality signal is output to the outside. In this way, the detection device at the location where the abnormality has occurred is operated to notify the outside.

However, in the conventional device as described above, even if there is an operation immediately before switching the contact signal of the limit switch 3, it does not appear as a signal to the outside.
Also, if you leave it in this state,
Since there is a risk that an abnormal signal will be generated if the movable element 4 receives shocking vibrations from the outside, it is necessary to return the movable element 4 to its original position. To do this, it is necessary to remove the body 1 and lid 2 at the screw part 1a, take out the internal movable element 4, leaf spring 6, and spacer 5, and reassemble them, depending on the position where they are attached to the electrical equipment. However, there were drawbacks such as difficulty in working with the method.

This invention is an attempt to eliminate the above-mentioned drawbacks of conventional devices, and is a method for detecting abnormalities in electrical equipment that allows the displacement of a movable element to be directly viewed from outside the device and facilitates the operation of returning the movable element to its original position. The purpose is to provide a device.

The present invention will be described below with reference to an embodiment shown in FIGS. 3, 4, and 5. In the figure, a transparent lid 12 is attached to a body 11 via a gasket 14 by screwing a lid holder 13 onto a threaded portion 11a, and a spacer 15 is provided inside the body 1 to prevent the leaf spring 16 from being bent more than necessary. A holding plate 18 fixed to the body 11 with screws 17 clamps and fixes the periphery of the leaf spring 16. As shown in FIG. 4, the leaf spring 16 has a disc shape with a center hole 16a having a diameter d and a notch 16b, and is in elastic contact with the movable member 19. The upper end of the mover 19 extends into the interior of the lid 12 to form a display end 19a. 20 is a cylindrical fork with a window formed around it, and the lower side of the window engages with the lower surface of the leaf spring 16 around the center hole 16a. A coil spring 21 is inserted between the stepped portions of the fork 20 and the movable element 19 to return the movable element 19 to its original position. The lower end of the body 11 is connected to a bottom plate 24 through a gasket 22 and a screw 23. A large number of circumferential grooves 19b are formed in the movable element 19, with which the periphery of the center hole 16a of the leaf spring 16 comes into elastic contact. The movable element 19 has a leaf spring 1 on the upper side.
You can lift up by pushing up 6, but there is a leaf spring 1 below.
6 is pinching the mover 19 and cannot move. Further, although the movable element 19 is pushed downward by the coil spring 21, it will not return downward as long as the leaf spring 16 is in contact with it. The leaf spring 16 acts like a ratchet. The upper end of the coil spring 21 is in contact with the fork 20, and a force is exerted on the fork 20 to move it upward.
The force that removes the object is not generated from the relationship of action and reaction.

Next, the effects will be explained. This detection device is attached to the outer wall of the container housing the electrical equipment main body for each gas category or at regular intervals. When vibration occurs on the outer wall due to an abnormality inside the electrical equipment,
The mover 19 operates in the same manner as in conventional devices.
vibrates. In this way, the amount of movement of the movable element 19 can be seen directly from all directions around the outside of the lid 12. Since the display section 19a is coated with paint or the like to make it easier to see, the operating status can be visually observed. To return the movable element 19, remove the lid holder 13 and the lid 12, and pull up the return fork 20 that engages the lower surface of the inner periphery of the leaf spring 16. When separated from 19,
The movable element 19 is pushed back downward by the return coil spring 21 to return to its original state. In this way, the return operation can be simplified. In addition, a small circumferential groove 19 is formed in the diameter D (>d) portion of the mover 19.
Since a large number of b are provided, the movable element 19 is difficult to move due to high frequency vibrations such as shock vibrations from the outside, but operates against vibrations up to 500 Hz caused by internal abnormalities.
Furthermore, since everything related to the operation of the component parts is arranged concentrically, the correct position of each part can be ensured by reducing the gap between the fitting parts. In addition, since this detection device is used outdoors, the connection part that communicates with the outside air has gaskets 14 and 2.
2 to keep it airtight.

The mover 19 moves little by little while vibrating, and does not move all at once using a toggle spring. In addition, unless a force greater than the force applied by the plate spring 16 acts on the movable element 19, it will not start moving, and this force for starting movement is determined by the relationship between the diameter D of the movable element 19 and the diameter d of the plate spring 16, and the plate spring 16
The spring characteristics determined by the material, plate thickness, length, and width of the movable member 19 can be changed, and the optimum value can be set depending on the target equipment.
It can be put into operation simply by attaching it to the outer wall of the container of electrical equipment.

As described above, the present invention has the following effects: the amount of displacement of the mover can be visually confirmed from all directions around the outside, the return operation of the mover is simple, and the operation is highly reliable. .

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a conventional device, FIG. 2 is a partial plan view, FIG. 3 is a vertical cross-sectional view of an embodiment of the present invention, FIG. 4 is a partial plan view, and FIG. is also a perspective view of the main part. 11...Body, 11a...Threaded portion, 12...Lid, 13...Lid holder, 14, 22...Putskin, 15...Spacer, 16...Spring plate, 16a
...Center hole, 16b...Notch, 17, 23...
Screw, 18... Pressing plate, 19... Mover, 19a
... Display end, 19b ... Circumferential groove, 20 ... Fork, 21 ... Coil spring, 24 ... Bottom plate.

Claims (1)

[Claims] 1. A body, a circular leaf spring whose periphery is fixed in the body and has a center hole, and a number of circumferential grooves are formed in which the periphery of the center hole of this leaf spring comes into elastic contact, and moves upward with excitation. a cylindrical mover; a transparent lid removably disposed on the upper end of the body;
a display end that is integrated with the movable element and extends into the interior of the lid; a fork that engages a lower surface around the center hole of the leaf spring to disengage the leaf spring and the movable element; An abnormality detection device for electrical equipment, comprising a coil spring that returns the movable element when the engagement is released.