JPH0128350B2 - - Google Patents

Description

[Detailed Description of the Invention] In order to quickly discover fault points such as ground faults and short circuits in power distribution lines, this invention is designed to hang directly on electric wires and check whether overcurrent due to an accident has passed through the power lines. This invention relates to an overcurrent passage display device that displays overcurrent passing.

The purpose of this invention is to display an overcurrent passage display for a certain period of time, not only when an overcurrent passes during an accident, but also in the case of a successful retransmission accident, such as when a tree momentarily comes into contact with an electric wire due to wind pressure, etc., and immediately leaves the line. It is an object of the present invention to provide an overcurrent passage display device which has a simple structure, can be easily manufactured and assembled, has excellent durability and is difficult to break down.

Hereinafter, one embodiment of the overcurrent passage display device of the present invention will be described with reference to FIGS. A fitting part 3 having a semicircular cross section is provided at the upper end of the upper surface.
A wire receiving portion 3 having a diameter a is bored. A locking plate 4 and a bounce prevention plate 5 are formed at the upper and center positions on the inner periphery of the main body 1, respectively, and through holes 4a and 5a are formed in the center of each plate 4 and 5, respectively.
is transparent. Further, a transparent plate 6 formed of a transparent material such as glass or synthetic resin on the inner periphery of the display window portion 1a formed at the lower end opening of the main body 1 has a watertight structure, and the splash prevention plate 5 A cylinder chamber 7 is also defined in the lower part of the main body 1. The cylinder chamber 7 is filled with a required amount of oil 8 whose viscosity changes little due to changes in external environmental conditions. Note that whether or not to color the oil 8 can be freely determined in consideration of the relationship with other members.

A movable iron piece 10 is disposed in a moving space 9 defined by the locking plate 4 in the upper part of the main body 1 so as to be able to move up and down, and the movable iron piece 10 is normally brought into contact with the upper surface of the locking plate 4 due to gravity. It is designed to be connected and locked. The upper end of a connecting rod 11 that is loosely inserted into the insertion holes 4a and 5a of the plates 4 and 5 is fixed to the center of the lower surface of the movable iron piece 10, and the lower end of the connecting rod 11 is always fixed to the oil 8. A valve mounting piece 12 located inside is fixed. The valve mounting piece 12
is fitted to the inner periphery of the cylinder chamber 7 so as to be able to move up and down with a small gap, and the valve mounting piece 1
A butterfly-shaped valve 13 is attached to each of the butterfly-shaped valves 2 by a hinge 14 so as to be able to rotate downward at a constant rate, and if necessary, each of the butterfly-shaped valves 13 may be provided with a small hole 15 as a leakage flow path. be.

The valve mounting piece 12 and both butterfly-shaped valves 13 also serve as indicators, and are located near the bottom of the cylinder chamber 7 in a normal state, and both butterfly-shaped valves 13 are in a horizontal position when the valve mounting piece 12 is lowered. The cylinder chamber 7, the oil 8, the butterfly valve 13, the small hole 15, etc. It constitutes a dart pot that extends the operating time of the movable iron piece 10 when it moves downward.

A lid 16 made of an insulating material such as rubber is removably attached and fixed to the upper surface of the main body 1, and a wire receiving portion is provided on the lower surface of the main body 1 so as to sandwich the electric wire 17 between it and the fitting portion 3a of the main body 1. A fitting groove 18 that fits into the flange 3 is recessed, and a flange 19 that is tightened with a bolt to the flange 2 is formed projecting at a position corresponding to the flange 2 on the lower end circumferential side thereof. . One of the flanges 19 and the corresponding flange 2 on the main body 1 side are connected by a hinge 20, so that the lid 16 can be opened and closed with respect to the main body 1.

Furthermore, a fixed core 21 is molded in the lid body 16 so as to straddle the fitting groove 18 .
It surrounds the electric wire 17 inserted therein. When a steady load current is flowing through the electric wire 17, the fixed iron core 21 does not generate enough suction force to move the movable iron piece 10 upward or stop its downward movement. When an overcurrent such as that flows, the movable iron piece 10 is attracted and
It is designed to generate a suction force sufficient to move the connecting rod 11 and the like upward against gravity.

Next, to explain the operation of the overcurrent passage display device configured as above, first, this device has a main body 1.
Open the lid 16, sandwich the electric wire 17 between the wire receiving part 3 and the fitting groove 18, close the lid 16, and bolt the flange 2 of the main body 1 and the flange 19 of the lid 16. It is attached to the electric wire 17 by tightening it. It is preferable to attach this device to the power distribution line so that the connecting rod 11 in the main body 1 is vertical, but there is no problem even if it is slightly tilted.

Now, when a steady load current is flowing through the electric wire 17 to which the overcurrent passage display device is attached as described above, the gravity acting on the movable iron piece 10 and each member connected thereto is applied to the movable iron piece 10. Because it is larger than the suction force of the fixed core 21 acting against
As shown in the figure, the movable iron piece 10 is in abutting and locking state on the locking plate 4, and thereby the valve mounting piece 12 and the butterfly valve 13 are located near the bottom of the cylinder chamber 7. Therefore, when looking into the cylinder chamber 7 from the outside through the transparent plate 6, the presence of the butterfly valve 13 and the like can be confirmed.

Note that if the presence of the butterfly valve 13 etc. near the bottom of the cylinder chamber 7 is used to actively indicate that no overcurrent is passing through, the valve mounting piece 12
In addition, a reflective material such as reflective paint or fluorescent paint is provided on the lower surface of the butterfly valve 13, and a display window portion 1a in the main body 1 is provided in order to improve the directionality of light and prevent the transparent plate 6 from becoming dirty. By extending it further downward than the transparent plate 6, it is possible to make it easier to see that the butterfly valve 13 etc. are present near the bottom of the cylinder chamber 7, and to make it easier to visually recognize that the butterfly valve 13 etc. are present near the bottom of the cylinder chamber 7. The display may be made easier to see by providing a scattering plate having a structure to polarize or scatter light that enters the display window portion 1a and exits from the display window portion 1a again.

Next, when an overcurrent flows through the electric wire 17 due to an accident such as a ground fault or short circuit, the fixed iron core 21 resists the force exerted by gravity on the movable iron piece 10 and each member connected thereto, and the movable iron piece 10 aspirate. Then, the movable iron piece 10 moves from the position shown in FIG.
Move up to the position shown in the diagram. On the other hand, the movable iron piece 10
Valve mounting piece 1 connected via connecting rod 11 to
The butterfly valve 13 attached to the second
Since the butterfly valve 13 is rotatably mounted to the state shown in the figure, the butterfly valve 13 is rotated by the oil 8 in the cylinder chamber 7 to the state shown in the figure, and a wide flow path is formed by this rotation. The butterfly valve 13 moves upward only when subjected to relatively small viscous resistance.

As a result, a large amount of oil 8 enters between the valve mounting piece 12 and the butterfly valve 13 and the transparent plate 6, and when you look into the cylinder chamber 7 from the outside through the transparent plate 6, you will notice that oil 8 is there. can be confirmed (if the oil 8 is colored, the colored color can be visually recognized), and thereby it can be confirmed that an overcurrent has flowed through the electric wire 17.

Note that when the movable iron piece 10 moves upward quickly, the oil 8 in the cylinder chamber 7 is absorbed by the valve mounting piece 12 and the butterfly valve 1.
3 may be splashed up, but in that case, the splashing prevention plate 5 prevents the oil 8 from splashing up any further, so there is no problem such as the oil 8 adhering to the movable iron piece 10.

Next, when the overcurrent has passed and the steady state has been restored, the fixed iron core 21 is connected to the movable iron piece 1.
Since it is no longer possible to maintain a holding force sufficient to suction and hold the movable iron piece 10 at the position shown in FIG. 3, the movable iron piece 10, together with the connecting rod 11, etc., starts to descend due to its own weight. As a result, due to the viscous resistance of the oil 8, the butterfly valve 13 becomes horizontal as shown in FIG. It begins to move relatively upward through a minute gap. When the oil 8 passes through the minute gap in this way, the descending speed of the movable iron piece 10 etc. becomes significantly slow.
When the cylinder chamber 7 is viewed through the transparent plate 6, the butterfly valve 13 etc. are visible (if the oil 8 is colored, the colored color disappears), which is delayed for a predetermined period of time. It turns out. Then, the movable iron piece 10 that has moved downward in the moving space 9 stops its downward movement by contacting and being locked by the locking plate 4, and at the same time, the butterfly valve 13 and the like are moved as shown in FIG. It stops near the bottom of the cylinder chamber 7.

The delay time can be arbitrarily set as necessary by appropriately combining the weight of the movable iron piece 10, etc., the viscosity of the oil 8, the minute gap, etc.

In addition, as another example, if the butterfly valve 13 is configured to be closed from the beginning, when the movable iron piece 10 is pulled up in the event of an accident, the butterfly valve 13 can move upward without receiving almost any oil resistance, which is preferable for operation. .

Hereinafter, in this overcurrent passage display device, the butterfly valve 1
Since the components other than 3 are substantially the same as those in the previous embodiment, the butterfly valve 13 will be mainly explained.

The lower surface of the butterfly-shaped valve 13 and the lower surface of the valve mounting piece 12 are coated with a reflective material such as reflective paint or fluorescent paint to improve visibility, and the butterfly-shaped valve 13 is fixed as shown in FIG. 9a.
Attach it to the valve mounting piece 12 in the closed state. When viewed from the outside, the overcurrent passage display device configured as described above in the normal state before the passage of an overcurrent shows the valve mounting piece 12.
Only the bottom surface of the valve mounting piece 12 is visible, and the bottom surface of the valve mounting piece 12 is used to display the normal state.

Next, when an overcurrent flows through the electric wire 17 to which the overcurrent passing indicator is attached, the movable iron piece 10 is attracted to the fixed iron core 21 as shown in FIG. 9b, and the valve mounting piece 12 and butterfly valve 13 are Move upward. Oil 8 during upward movement
Since the butterfly valve 13 remains closed due to the resistance, only the bottom surface of the valve mounting piece 12 can be seen from the outside, and the normal state continues to be displayed.

Furthermore, when the overcurrent disappears and the distribution line returns to normal, the adhesion force to the movable iron piece 10 disappears, so the butterfly valve 13 is moved by the oil 8 as shown in FIG.
In response to the resistance, it opens horizontally and descends. Therefore, during the descent, not only the lower surface of the valve mounting piece 12 but also the lower surface of the butterfly valve 13 becomes visible. In this overcurrent passage display device, when the butterfly valve 13 is open, an overcurrent passage indication is performed using the lower surface of the valve mounting piece 12 and the lower surface of the butterfly valve 13. Note that the butterfly valve 13 is moved upward to the extent that its lower surface is visible from the outside.

Thereafter, the butterfly valve 13 closes again as shown in FIG. 9a, and the lower surface of the butterfly valve 13 is no longer visible from the outside, but only the lower surface of the valve mounting piece 12 is visible, returning to the normal display. .

As described above, in this overcurrent passage display device, when the butterfly valve 13 is closed, the normal state is displayed only on the lower surface of the valve mounting piece 12, and when the butterfly valve 13 is open, the valve mounting piece Lower surface of 12 and butterfly valve 13
The underside of the screen indicates the passage of overcurrent.

In other words, as shown in FIGS. 9a and 9b, when a steady current is flowing, an overcurrent flows into the butterfly valve 1.
While the butterfly valve 13 is moving upward, a normal state is displayed, and then, as shown in FIG. Then, when the butterfly valve 13 closes again and returns to the initial state shown in FIG. 9a, the display returns to the normal state.

Next, modifications of the splash prevention plate 5 in the above embodiment will be explained with reference to FIGS. 5 and 6. FIG. 5 shows an example in which the lower surface of the splash prevention plate 5 is aligned with the oil level. In this case, the upper surface of the prevention plate 5 may be shaped like a dome as shown by the two-dot chain line.
Further, FIG. 6 shows a modification in which the splash prevention plate 5 is formed to float on oil 8.

Next, another example of a valve constituting a part of the dart pot will be explained with reference to FIGS. 7 and 8. This valve 22 has a valve seat 23 formed integrally with the connecting rod 11.
and a valve body 25 having a flexible base end fixed to the center of the valve seat 23 so as to close a semicircular through hole 24 formed in the valve seat 23 from below; It is formed by a small hole 26 transparently provided in the valve body 25.

As detailed above, this invention divides the iron core attached to the electric wire so as to surround it into a fixed iron core and a movable iron piece, and when an overcurrent flows through the electric wire, the movable iron piece is attached to the fixed iron core. Since the driving force is obtained by utilizing the attraction force that resists the urging force that acts in the direction of separating the two, there is almost no need for complex mechanisms or electrical circuit parts, and the structure is simple. This has the effect of reducing the number of breakdowns. In addition, by linking the movable iron piece with a dart pot mechanism and providing a valve device on the movable body of the mechanism, the movable iron piece can not only be quickly moved in the direction in which it is attracted to the fixed iron core, but also When moving in a direction away from the iron core, a delayed operation can be performed. Furthermore, by linking the display to the movable iron core, when an overcurrent flows through the wire, it can be immediately displayed, and even after the overcurrent has passed, the display can continue for a certain period of time. become.

Taking all of these into account, the overcurrent passage display device of the present invention has a particularly simple structure, can be manufactured and assembled easily, and has excellent durability and is unlikely to malfunction. This is an excellent invention for industrial use.

It should be noted that the present invention is not limited to the above-mentioned embodiments or other examples, and for example, a mechanism similar in form to a conical valve or a floating ball valve may be employed as a valve device, or an oil 8 as a fluid used in a dumppot mechanism may be employed. It is possible to do so without departing from the spirit of the invention, such as by adopting a material other than the above, by making the lid 16 removable from the main body 1, by eliminating the splash prevention plate 5, or by changing the shape and configuration of each member as appropriate. It can be changed arbitrarily within the range.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view, FIG. FIG. 4 is a sectional view similarly showing the state in which the dart pot mechanism is in operation. Fifth
6 are sectional views of essential parts showing modifications of the bounce prevention plate in the embodiment described above, respectively. FIG. 7 is a sectional view showing another example of the valve device, FIG. 8 is a plan view of the same, FIG. FIG. 9b is a cross-sectional view of a main part of the same device showing the state in which the butterfly valve is moving upward, and FIG. Main body...1, Display window part...1a, Wire receiving part...
...3, Locking plate...4, Transparent plate...6, Cylinder chamber...7, Oil...8, Moving space...9, Movable iron piece...
...10, Connecting rod...11, Valve mounting piece...12, Butterfly valve...13, Hinge...14, Small hole...15, Lid body...16, Electric wire...17, Fitting groove... 18, Fixed iron core...21, Valve...22, Small hole...26.

Claims (1)

[Claims] 1 A fixed core that constitutes a part of the core that is attached to the electric wire so as to surround it, and a fixed core that constitutes the remainder of the core so that it can be attached to the fixed core and always move away from the fixed core. The movable iron piece is biased toward the movable iron piece, the display body is interlocked with the movable iron piece, and the movable iron piece is moved so as to delay the time when the adsorption force of the fixed iron core is lost and the movable iron piece moves in the biased direction. and a valve device provided on a movable body in the dartpot mechanism to widen a flow path when the movable iron core moves in a direction in which it is attracted to the fixed iron core. Overcurrent passing indicator.