JPH0210385B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention provides a method for quickly detecting fault points such as ground faults and short circuits in power distribution lines by directly suspending them from electric wires so that overcurrent caused by accidents passes through the power lines. This invention relates to an overcurrent passage display device that displays when an overcurrent has passed.

Prior Art Overcurrent passage display devices are mainly used as a means for early detection of points where overcurrent has passed through power distribution lines, and they usually continue to display for about 3 to 5 hours required for inspection, and also after a certain period of time has elapsed. After that, a function is required to return to the normal normal state.

A type of display device of this kind was considered that could be hung directly on a power distribution line and would detect the current using a CT and operate the display, but a mechanical display could be operated using the electromagnetic force caused by an overcurrent passing through the power distribution line. Therefore, in reality, the mechanical operation of the display device itself must operate faster than the OCR operation of the substation, and the fault current is usually around 600A to 1000A and the transit time is instantaneous, and this much electrical energy is required. However, it is not easy to instantly activate the display device, continue this operation for a predetermined period of time, and then automatically restore the display device.

Purpose This invention solves the above-mentioned problems at once by converting electrical energy from the current detected by CT into mechanical energy, storing it once, and displaying it with a time lag. It is an object of the present invention to provide an overcurrent passage display device that can reliably perform an accident display operation for passing overcurrent and automatically recover after a certain period of time.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 9.

This overcurrent passage display device can be roughly divided into a current detection section A that detects overcurrent, a display drive section B that is operated by the detection section, and a drive transmission mechanism section H that transmits the driving force of the display drive section B. and a display device I operated by the drive transmission mechanism H.

First, we will explain the current detection part A. This detection part consists of a cut core 1 for detection arranged in a ring shape so as to surround the outside of the electric wire L, and a coil 2 wound around the cut core 1. It is comprised of a transformer 3 and a step-up transformer 4 (which may be omitted) connected to the coil 2. 5 is a surge absorber connected in parallel to the secondary side of the step-up transformer 4.

The display drive section B includes a full-wave rectifier 6 connected to the transformer 4, a capacitor C connected to the output side of the rectifier, and a bidirectional trigger diode TD and a relay X connected in parallel to the capacitor. A series circuit, a variable resistor R that is also connected in parallel to the capacitor C and for changing the voltage applied to the capacitor C, and a contact Xa of the relay X and a rotary solenoid RS that are also connected in parallel with the capacitor C. It is composed of a series circuit. The rotary solenoid RS has a structure in which the output shaft is rotationally driven when the rotary solenoid is energized, and when the excitation is released, the output shaft is rotated back to its original position by a built-in return spring S as an energy storage member. When the terminal voltage of the capacitor C reaches a certain value (for example, when an overcurrent flows), the trigger diode TD
is made conductive and relay X is operated. As a result, the a contact Xa of the relay X is closed and the rotary solenoid RS is rotated by a predetermined angle (45 degrees in this embodiment) in the driving direction.

Next, the drive transmission mechanism section H will be explained.
7 is a drive gear fixed to the rotating shaft of the rotary solenoid RS, and 8 is rotatable with respect to a bracket 9 attached to a storage case (not shown) so as to be parallel to the rotating axis of the gear 7. A driven gear 10 that meshes with the drive gear 7 is fixed to one end of the rotating shaft.

The ratio of the number of teeth between the driving gear 7 and the driven gear 10 is a constant ratio (4:1 in this embodiment).
is set to .

Reference numeral 11 denotes a rotating plate as a large-diameter rotating member supported so as to be freely rotatable in both directions with respect to the other end of the rotating shaft 8, and 12 is a pin protruding from the back surface of the rotating plate. As shown in FIG. 2, a guide slope 12a is provided at the tip thereof. Reference numeral 13 denotes a tripping member whose base end is fixed obliquely above the rotating shaft 8 to the side surface of the bracket 9 on which the rotary plate is attached, and whose distal end descends diagonally downward and forward. It is formed.

14 has its base end fixed to the rotating shaft 8 so as to be interposed between the rotating plate 11 and the bracket 9;
An elastic operating lever protrudes in a radial direction therefrom, the tip of which is connected to the tripping member 13.
It can be engaged with and detached from the lower surface of the pin 12 and the pin 12. In addition, when the same operating lever 14 is in the normal state,
It is clamped between the lower surface of the proximal end of the tripping member 13 and the surface of the bracket 9, and is bent slightly backward.

the driving gear 7, the driven gear 10, the rotating plate 11,
Pin 12, tripping member 13, operating lever 1
4 constitutes a drive transmission mechanism section H.

Next, the display device I will be explained according to FIGS. 8 and 9. Reference numeral 15 denotes an L-shaped frame member located below the rotary plate 11 and rotatably attached to a shaft 16 at a corner. A weight 17 is fixed to the tip of one frame piece 15a, and the tip of a string-like member 18, such as a hanging string, whose base end is attached to the circumferential surface of the rotary plate 11 corresponding to the pin 12 is attached. It is worn.
Reference numeral 19 denotes a display plate as a display portion fixed in a quarter-arc shape between the ends of both frame pieces of the frame member 15, and is made of a lightweight material such as plastic. The peripheral surface of the display board 19 is colored black on the side of the frame piece 15a as a normal state display section 19a, and the rest is colored red as an overcurrent passage display section 19b. Under normal conditions, the rotary plate 11 is urged downward by the weight of the weight 17 etc. via the string member 18, so that the pin 12 is located below the rotary shaft 8, and the display plate 19
The normal display section 19a is stored in a case (not shown).
Fully displayed from the display window 20a provided on the lower wall 20,
It is visible from the outside.

Reference numeral 21 denotes a resistance member made of cloth or the like as a resistor, which is provided on the storage case side so as to be able to come into sliding contact with the display plate 19, and the display plate 19 changes from the overcurrent passing display position (FIG. 9a) to the normal state display. The tips of the bristles protrude in the overcurrent passing display direction so that the display plate 19 is delayed in operation only when the display plate 19 is rotated in the direction P. The frame member 15, the weight 17, and the display board 19 constitute a display device I, and the weight of the display device I is such that it cannot be driven by the elastic force of the return spring S of the rotary solenoid RS. In addition, 22 is the rotating plate 11
This is a guide roller that guides a string-like member 18 provided so as to be located between the display device I and the display device I.

To explain the operation of the overcurrent display device configured as above, when a steady load current is flowing through the electric wire L as shown in FIG.
The normal display portion 19a of the display board 19 is completely displayed through the display window 20a by being biased downward by its own weight.

If an overcurrent flows through the wire L due to an accident in this state, a transformed current is generated by the transformer 3 shown in FIG. .

When the voltage of the capacitor C reaches a certain value,
Trigger diode TD becomes conductive and relay X
is excited and closes its a contact Xa. As a result, a return spring S equipped with a rotary solenoid RS
When the output shaft and the operating lever 14 are rotated 45 degrees in the driving direction against the elastic force of It is rotated 180° in the direction of the arrow. At this time, as shown in FIG. 2, the operating lever 14 that has rotated downward comes into contact with the guide slope 12a of the pin 12 of the rotating plate 11 located below the rotating shaft 8, but due to its elasticity, it bends toward the bracket 9. It bends and climbs over the pin 12 while sliding on the guide slope 12a. In addition, the rotary solenoid up to this point
The operation of the operating lever 14 by the rotation of RS is instantaneous.

Then, the rotary solenoid that has finished rotating
The output shaft of RS starts to rotate back in the opposite direction, that is, in the counter-driving direction, by the built-in return spring S. As a result, when the operating lever 14 rotates via the drive gear 7, driven gear 10, and rotation shaft 8 from the position shown by the chain line in FIG. 4 to the position shown by the solid line, the operating lever 14 is locked to the pin 12 and rotated. As shown in FIG. 5, the plate 11 is rotated in the opposite direction to wind up the string member 18. Therefore, the display device I is rotated in the overcurrent passing display direction via the string member 18 while resisting the gravity of the weight 17 and the like.

Further, when the actuating lever 14 is rotated in the counter-driving direction, the tip of the actuating lever 14 comes into contact with the tripping member 13, and then the tripping member 13
Since it slides while being pressed against the member 13, the return operation is completed at the base end of the tripping member 13 while bending toward the bracket 9 due to its elasticity. At this time, the display board 19 of the display device I displays the overcurrent passage display section 19b from the display window 20a, but when the operating lever 14 is bent, it rotates as shown in FIGS. 6 and 9a. The pin 12 of the plate 11 is the same operating lever 1
4, the display device I starts rotating in the normal display direction due to its own weight.

At this time, since the display board 19 slides while contacting the resistance member 21, the rotation speed becomes extremely slow and it takes a predetermined time until the normal display part 19a of the display board 19 becomes visible through the display window 20a. It will cost. Then, the weight 17 of the display device I is
6, the display device I stops rotating, and at the same time, the display board 19 completely displays the normal display section 19a from the display window 20.

Next, a second embodiment of the present invention will be described with reference to FIG.

This embodiment differs from the first embodiment in the display driving section, so this point will be explained. The circuit configuration of the rectifier 6, relay X, a contact Xa, trigger diode TD, capacitor C, and variable resistor R of the display drive section B is the same as that of the first embodiment, and a solenoid 30 is connected instead of the rotary solenoid. are doing. Reference numeral 31 is a movable core of the solenoid 30, and a spring 32 serves as an energy storage member.
It protrudes to the side by means of a magnet, and is drawn inward during excitation.

Reference numeral 34 denotes a cylindrical cam installed in place of the driven gear 10 of the first embodiment, and two spiral cam grooves 35 are cut into the cylindrical cam 34 at an interval of approximately 180° from each other. ing.

Reference numeral 36 denotes a cam ball which is formed by dividing the distal end of the movable iron core 31 of the solenoid 30 into two forks and pivotally attached to both ends thereof, and is capable of rolling within the cam groove 35 .
Therefore, when the movable core 31 of the solenoid 30 is attracted, the cam ball 36 moves in the same direction, and the cylindrical cam 34 is rotated by 180 degrees in the fixed position.

Next, the operation of the second embodiment configured as described above will be explained.

Now, when an overcurrent flows through the electric wire L, the current flows to the solenoid 30 via the detection part A and the like, and the solenoid 30 is excited.
Therefore, the movable core 31 is attracted against the elastic force of the spring 32, the cam ball 36 moves to the right in FIG. Rotates 180°. Then, in the same manner as in the first embodiment, the pin 12
Get over it. After that, when the overcurrent is eliminated, the solenoid 30 is also demagnetized, and the movable iron core 31 is projected and returned by the elastic force of the spring 32, and at the same time, the operating lever 14 is locked to the pin 12, and the drive transmission mechanism section H and the display are The device I operates in the same manner as in the first embodiment, displays an overcurrent passage indication, and performs a recovery operation after a certain period of time.

The effects of this embodiment are also similar to those of the first embodiment.

Note that the present invention is not limited to the above-described embodiment; for example, in the first embodiment, instead of the return spring, a weight may be suspended via a string-like body to a pulley fixed to the output shaft of the rotary solenoid. It is also possible to provide an energy storage member that is pulled up by the pulley and stores energy when the output shaft rotates in the driving direction. Similarly, in the first embodiment, the lower end of the string-like member 18 is connected to a display body in a display device containing fluid in a container, and when the energy storage member returns, the display body is lifted against the resistance of the fluid. It is also possible to use a so-called oil damper type display device in which the display body is lowered by its own weight after a return operation.

Effects As described in detail above, the present invention includes a current detection section arranged to surround an electric wire, a display drive section that rotates while accumulating energy in the energy storage member when the detection section detects an overcurrent, and the storage member. In the overcurrent passage display device, the drive transmission mechanism is connected to the display drive unit only when the display drive unit returns due to the accumulated force of the biasing member. A rotating shaft, an operating lever that is rotated by the rotating shaft, and an overcurrent passage display unit that is linked to the operating lever when the operating lever is rotated to return and can be visually viewed from the outside against the gravity of the display device. The structure consists of a rotating member that is driven in the direction of , and a tripping member that releases the link between the rotating member and the moving lever after the drive to the overcurrent passing display position is completed, so that the overcurrent that passes instantly can be removed. In addition, the overcurrent passage indication operation can be performed reliably by the cooperation between the actuation lever and the rotating member, and after the drive to the overcurrent passage indication position is completed, the tripping member separates the actuation lever from the rotating member. Since the linkage can be canceled, the display device can be automatically returned to the normal display position by its own weight after a certain period of time.

[Brief explanation of drawings]

FIG. 1 shows a current detection unit, a display drive unit, and
An electric circuit diagram showing the drive transmission mechanism section, FIG. 2 is an explanatory diagram showing the pins of the rotary plate of the drive transmission mechanism section,
Figure 3 is a perspective view showing the steady state of the operating lever of the drive transmission mechanism, and Figure 4 is from the state shown in Figure 3.
A perspective view of the operating lever rotated 180 degrees and locked to the pin, Figure 5 is a perspective view of the state in which the rotating plate is driven by the operating lever from the state of Figure 4, and Figure 6 is a perspective view of the state shown in Figure 5.
After the state shown in the figure, a perspective view of the state in which the pin of the rotary plate is detached from the operating lever, FIG. 7 is a perspective view of the state in which the rotary plate is rotated under pressure from the state of FIG. 6, and FIG. 8a 8b is a bottom view of the display board in FIG. 8a, FIG. 9a is the display device in an overcurrent passing display state, and FIG. 9b is the display board in FIG. 9a. FIG. 10 is an electric circuit diagram showing the current detection section, display drive section, and drive transmission mechanism section of the second embodiment. Current detection section...A, display drive section...B, drive transmission mechanism section...H, display device...I, electric wire...L, rotary solenoid as display drive section...RS, return spring as energy storage member...S, rotation Shaft...8, rotating plate as a rotating member...11, tripping member...13, operating lever...14, string member...18, display plate as a display section...19, normal state display section...19a, overcurrent passage display part...19b, solenoid...30 as a display drive part, movable core...31, spring...32 as an energy storage member, cylindrical cam...34, cam groove...3
5. Come ball…36.

Claims (1)

[Claims] 1. Current detection unit A arranged to surround electric wire L
When the detection unit A detects an overcurrent, the energy storage member S, 3 is activated.
A display driving section B rotates while accumulating power of the display device I, and a drive transmission mechanism H that causes the display device I to perform a display operation by being linked only during the return operation of the display driving section B by the accumulating force of the energy accumulating member S and 32. An overcurrent passage display device comprising: a rotation shaft 8 linking the drive transmission mechanism H to the display drive section B; an operating lever 14 rotated by the rotation shaft 8; A rotating member 11 that is linked to the actuating lever 14 during return rotation and drives the overcurrent passage display section 19b in a direction in which it becomes visible from the outside against the gravity of the display device I; After the drive is completed, the rotating member 1
1 and a tripping member 13 for releasing the linkage between the operating lever 14 and the operating lever 14. 2. The overcurrent passage display device according to claim 1, wherein the display drive unit B is a rotary solenoid RS, and the energy storage member is a return spring S for returning the output shaft built into the rotary solenoid RS. 3. The display device I is connected to the rotary member 11 by a string-like member 18, and has a display portion 19 formed in an arc shape rotatably attached to the shaft.
9 is divided into an overcurrent passage display section 19b and a normal state display section 19a, and normally the normal state display section 19
The overcurrent passage display device according to claims 1 and 2, wherein the center of gravity is unevenly distributed such that point a is located on the bottom surface. 4. The overcurrent passage indicator according to claim 1, wherein the display drive unit B is composed of a solenoid 30 and cam mechanisms 34, 35, and 36 that are linked to a solenoid 30 and its movable core 31 and convert linear motion into rotational motion. Device. 5. The cam mechanism comprises a cylindrical cam 34 with a spiral cam groove 35 carved therein, and a cam ball 36 that is attached to the tip of the movable core 31 and rolls within the cam groove 35. Overcurrent passing indicator device as described.