JP2668387B2 - Indicator for exploring ground fault points - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention attaches to a distribution line to detect and display when a search signal current flows through the distribution line and to display the detected signal current. The present invention relates to a display for point exploration.

[Conventional technology]

An annular core in the current transformer is attached to the distribution line so that the distribution line penetrates through the distribution line, and a detection coil is attached to the core. A detection signal current flows through the distribution line to obtain a detection signal in the coil. In some cases, the display unit is operated based on the detection signal.

However, with the above-mentioned structure, it is difficult to attach an annular core to the distribution line. Therefore, the applicant of the present invention filed Japanese Patent Application No. 62-206743 of August 20, 1987 and August 21, 1987. In Japanese Patent Application No. 62-207476, by attaching to the distribution line,
A detection unit configured to detect a detection signal current flowing through the distribution line and output a detection signal, and a display unit configured to display and operate upon receiving the detection signal, wherein the detection unit includes:
The base body and the pressing body, which are located on the lower side and the upper side of the distribution line, respectively, and on both sides of the space in which the distribution line is located between the base body and the pressing body. The base has two fasteners adapted to fasten the holding body, and the base has a U-shaped first current transformer core in an annular current transformer core for surrounding the space where the distribution line is located. An element is provided with the two connecting end faces thereof facing upward, and the first element is provided with a detection coil, while the holding body is provided with the annular current transformer core. Is provided such that the two connecting end faces of the second element are brought into contact with the two connecting end faces of the first element by fastening the pressing body to the base. Of a ground fault accident point indicator .

[Problems to be solved by the invention]

However, in the case of the above-mentioned proposal, when mounting work on a live distribution line, two fasteners must be tightened. When attempting to tighten the fastener on the side opposite to the operating hand with that hand, the wrist must be climbed over the above-mentioned live power line and extended to the fastener on the opposite side. Therefore, there is an extremely dangerous problem.

Also, if there is an imbalance in the tightening force of the above two fasteners,
Of the two connecting end faces of the first element and the second element which are brought into contact with each other, one is pressed with a large force, and the other has a gap, and the magnetic characteristics as a core are degraded. There are also problems.

Furthermore, if the tightening force of the two fasteners is too strong, it is applied to the above-mentioned end faces and an excessive pressing force is applied thereto, and the first or second element is damaged (chipped). is there.

The present invention has been made in view of the above points, and an object of the present invention is to make it possible to easily and safely mount an operation on a distribution line, and to make the core exhibit predetermined magnetic characteristics in the mounted state. In addition, it is an object of the present invention to provide a ground fault point exploration indicator which can prevent accidental breakage of a core during mounting.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a detection unit that is attached to a distribution line to detect a detection signal current flowing through the distribution line and output a detection signal, and to receive the detection signal. And a display unit adapted to perform a display operation, and the detection unit includes a base body and a pressing body that are located below and above the distribution line, respectively, and the base body and the pressing body. On both sides of the space where the distribution line is located between the two, each has two fasteners to tighten the holding body to the base, and further, the base,
A U-shaped first element of an annular current transformer core for surrounding the circumference of the space where the distribution line is located is provided with two connecting end faces thereof facing upward, and A detection coil is attached to the element, while the pressing body is provided with a second inverted U-shaped second portion of the annular current transformer core.
The element is fixed to the second body by fastening the holding body to the base.
In the ground fault point exploring indicator provided so that two connection end faces of the element are in contact with the two connection end faces of the first element, one of the fasteners is pressed against a base. The body is configured by a hinged device for hingedly opening and closing the body, and the other is constituted by an engaging rod having one end connected to the base body and the other end engaged with the holding body. The state in which the second element is attached to the holding body is such that the second element is freely movable toward and away from the base with respect to the holding body, and the second element has both legs with the longitudinal direction of its own base as the center of rotation. The tip of the portion is configured to be capable of tilting, and the second element is biased toward the base body at an intermediate portion of the back of the second element opposite to the connecting end face. The urging spring is elastically brought into contact with the second element. Is provided with a guide member around the connection end face of the first element for guiding the second element so that the connection end face of the second element overlaps with the connection end face of the first element. is there.

[Action]

In the case of mounting to a distribution line, the base is addressed to the lower side of the distribution line, the holding body is turned around the hinged portion to cover the distribution line, and the free end is connected to the base with an engaging rod. I do. In the mounting state performed in this manner, the two connecting end faces of the second element are elastically pressed against the two connecting end faces of the first element with an appropriate pressing force.

〔Example〕

Hereinafter, drawings showing an embodiment of the present application will be described. First
In the display shown in FIGS. 2 and 3, reference numeral 1 denotes a case, which is formed of a metal material, for example, an aluminum alloy, and is formed in a shape whose lower side is open. Reference numeral 2 denotes a detection unit provided on the upper part of the case 1 and reference numeral 3 denotes a display unit, which comprises a drive circuit 3a provided in the case and a display 3b attached to the lower side of the case 1. In the detection unit 2, reference numeral 4 denotes a base, which is configured by the upper portion of the case 1. Reference numeral 6 denotes an electric wire receiving portion formed on the base body 4 so as to bulge upward, and reference numerals 7a and 7b denote connecting pieces.

Next, reference numeral 10 denotes a pressing body in the detection unit 2. 11 is the third
The main body of the holding body 10 which is long in the left-right direction in the figure is formed by press-forming a metal plate into a U-shaped cross section as shown in FIGS. Reference numeral 12 shown in FIG.
Is a bolt insertion hole formed at one end of the main body 11, 13 is an inlet, and 14 is a stopper. Next, reference numeral 15 denotes a mounting seat portion provided at an intermediate portion of the main body 11, which is formed so as to project right and left as shown in FIGS. Reference numeral 16 denotes a support attached to the seat 15, which is made of polyethylene. 17 is the support
It is a wire retainer attached to 16 and is formed of a rubber material having elasticity, and has a concave portion 18 on its lower surface for applying to the wire.

Next, two fasteners provided on both sides of the space 20 for the distribution line between the base 4 and the presser 10 to tighten the presser 10 to the base 4 will be described. Reference numeral 21 denotes one of the fasteners, which is configured with a butterfly attachment. A shaft pin is used as the butterfly attachment 21, so that the pressing body 10 can be attached to the base body 4.
It is hinged to open and close freely. Next, reference numeral 22 denotes the other fastener, one end of which is connected to the base body 4 and the other end of which is constituted by an engaging rod adapted to engage with the pressing body 10. In this fastener 22, a bolt 23 has one end pivotally connected to the connecting piece 7b with a shaft 24 as shown in FIGS. Reference numeral 25 denotes a seat formed at an intermediate portion of the bolt 23, which is formed in a flange shape as shown in the figure. Reference numeral 26 denotes a tightening nut screwed onto the bolt 23.

Next, reference numeral 28 denotes a current transformer for detecting current in the detecting unit 2, wherein 30 is a current transformer core, which is formed in an annular shape surrounding the space 20 where the distribution line is located. Also this core
30 is made of ferrite. The above core
30 comprises a U-shaped first element 31 and an inverted U-shaped second element 32. In the first element 31, reference numerals 31a and 31b denote leg portions, respectively, and reference numeral 31c denotes a connecting portion for connecting both leg portions, and is fixed to the base 4. Reference numerals 31a 'and 31b' indicate connection end faces, respectively. Also the second
In the element 32, 32a and 32b are legs, and 32c is a connecting portion.
As shown in the figure, the cross-sectional shape is formed in a semi-cylindrical shape, and the back or upper surface 32c 'thereof is a flat surface and the lower surface 32c "is a curved surface. 32a' and 32b 'are connected to each other. 3 shows an end surface for use.

Next, the mounting structure of the second element 32 to the holding body 10 will be described with reference to FIGS. 36 is a receiving member formed integrally with the support plate 16, the upper surface of which is a V-shaped concave portion 36a, into which the lower surface 32c "of the connecting portion 32c of the second element 32 is fitted. Thus, the second element 32 is configured such that the distal ends of the two legs can tilt in the left-right direction in FIG. 4 around the longitudinal direction of the base of the second element 32 (left-right direction in FIG. 1). The horizontal dimension of the member 36 in FIG. 1 is substantially equal to or slightly shorter than the distance between the legs 32a and 32b of the second element 32, and the horizontal dimension of the second element 32 in FIG. 37 is an urging spring, which has two legs 37a, 37a, as shown in FIG.
A torsion coil spring with 37b is used, one leg 37b of which is attached to the body 11 of the presser body 10 with a stop 38, and the other leg 37a of which is at the upper surface 32c 'of the second element 32. The second element 32 is elastically brought into contact with an intermediate portion in the tiltable direction of the leg portion (left-right direction in FIG. 4).
Is urged toward the base 4 side. With such a configuration, the second element 32 is elastically movable toward and away from the base 4, and the forward movement is received by the receiving member 36.
Reference numeral 40 is a guide member provided around the end faces 32a ', 32b' at the tips of the legs 32a, 32b of the second element 32, which is made of a synthetic resin material, the inner surface of which is tapered as shown in FIG. The guide surface 40a has a rectangular shape and is attached to the leg portions 32a and 32b with an adhesive 40b. The guide member 40 may be provided on the leg portion of the first element 31 instead of the second element 32.

Next, reference numeral 42 shown in FIG. 1 denotes a coil assembly attached to the second element 28, which comprises a coil case 43 and a detection coil 58 provided in the case 43. Reference numeral 61 denotes a coil cover put on the coil assembly 42 for protecting the coil assembly 42 from rainwater. The cover also covers the upper surface of the case 1 to prevent rainwater from being directly sprayed thereon.

Next, the display unit 3 will be described. The drive circuit 3a
Is formed by mounting a well-known circuit element on a printed circuit board, and is mounted on a mounting frame (not shown) fixed to the case 1. Reference numeral 71 denotes a driver of the display 3b, which has a rotating shaft (not shown) for driving the display, and is mounted on the mounting frame. Reference numeral 72 denotes a display, which is attached to a rotation shaft of the driving body 71. The display body 72 is formed in a cup shape, and the lower surface and the peripheral side surface are separately painted into a white portion 72a and a black portion 72b as shown in FIG. 73 is a cover of the display device, which is formed of a transparent material,
It is fixed to the case 1 by a fastening ring 74. Reference numeral 75 denotes a watertight O-ring. Reference numeral 80 denotes a shielding frame, which is used to provide a part of the cover 73 with the shielding function of the display body 72, is formed in black, and has windows 81 and 82 formed on the side and lower surfaces, respectively.

Next, attachment of the indicator having the above configuration to the high-voltage distribution line 95 will be described. As shown in FIG. 2, with the pressing body 10 opened with respect to the base body 4, the overhead high voltage distribution line 95
, The substrate 4 is addressed from below. Next, the presser body 10 is put on the distribution line 95. The work can be easily performed by slightly pushing up the presser body 10 in the direction of arrow 96 in FIG. When the presser body 10 is placed on the distribution line 95 in this manner, the connecting end surface 31 of the first element 31 is formed by the tapered guide surface 40a of the guide member 40.
End faces 32a ', 32b' for connection of second element 32 to a ', 31b'
Are properly positioned, the end faces 31a 'and 32a' and the end faces
31b 'and 32b' polymerize exactly without displacement. Then, the bolt 23 is raised as shown by the arrow 97 in FIG. 2 and is positioned in the insertion hole 12 through the introduction port 13. Thereafter, the nut 26 is tightened to sequentially move the holding body 10 toward the base 4, and the distribution line 95 is moved via the cover 61 to the distribution line mounting portion on the top surface of the electric wire receiving portion 6 and the wire holding portion 17. It is in a state of being firmly sandwiched between the portion 18. In this case, even if the main body 11 of the presser body 10 moves toward the base 4, the second element 32, the end surface of which has already contacted the first element 31, does not move in the same direction as described above. Only the biasing spring 37 bends. Therefore, in this state, the second element 32 is pressed against the first element 31 by the urging force of the urging spring 37. As a result of the above, the lower surface 32c "at the connecting portion of the second element 32 and the receiving member 3
As shown in FIG.

When the nut 26 is tightened as described above, the movement due to the tightening is caused by the front end of the main body 11 in the holding body 10 being a seat.
It is limited to the position where it touches 25. This makes the presser body
It is possible to prevent the body 11 of 10 from being excessively moved to the side of the base 4 and the urging spring 37 being crushed (being unable to exhibit elasticity).

In the case where the mounting to the electric wire 95 is performed as described above, when the holding body 10 is opened with respect to the base 4 as shown in FIG. Since the second element 32 is elastically held by the urging spring 37 even when the second element 32 is hit by the foreign material, the second element 32 can be inclined as shown by the imaginary line in FIG. Is prevented from being damaged by a large force.

Next, the operation of the display having the above configuration will be described. When the exploration signal current flows through the high-voltage distribution line 95 in the above mounting state,
The resulting magnetic flux is generated in the core 30. The magnetic flux is detected by the detection coil 58 and transmitted to the detection signal drive circuit 3a. Then, the drive circuit 3a outputs a drive signal, which is given to the drive body 71 of the display tool 3b. Then the driving body 71 is a display body
72 is driven to rotate. As a result, the display body 72 which has been in the normal position with respect to the cover 73 as shown in FIG. 9 and the black portion 72b is located in the windows 81 and 82 is shown in FIG. In this way, the cover 73 is moved to the display position, and the white portion 72a is positioned in the windows 81 and 82. That is, the display tool 3b, which had been in the state of appearing black as a whole as shown in FIG. 9 until now, is changed to the white display color in the black background as shown in FIG. Is visible. Note that the display performs the same operation as described above even when a short-circuit current flows through the high-voltage distribution line 95, and the display body 72 performs a recovery operation when a return signal current flows through the high-voltage distribution line 95. ing.

〔The invention's effect〕

As described above, in the present invention, in a state where the current transformer core 30 is attached to the distribution line 95 so that the current transformer core 30 surrounds the distribution line 95, the detection signal current flowing through the distribution line 95 is detected,
The display unit 3 can be operated using the detection signal. When the detection unit 2 is attached to the distribution line 95 while the distribution line 95 is in a live state, the tightening operation of the fastener is performed by using one of the fasteners. Since only 22 needs to be performed, the operation is extremely simple and safe (the dangerous operation of moving the wrist over the distribution line and operating the opposite fastener as in the prior art is unnecessary). This has the effect that it can be performed.

Moreover, even if tightening with only one operation as described above,
In the tightened state, the connecting end faces 32a ', 32b' of the second element 32 in the current transformer core 30 are elastically pressed against the connecting end faces 31a ', 31b' of the first element 31. Thus, both of the two connecting end faces of the first and second elements 31 and 32 are both connected (the connecting end faces 31a 'and 32a' and the connecting end faces 31b 'and 3b).
2b ') There is an effect that the magnetic properties can be exerted as planned by applying pressure evenly.

Furthermore, in the case of the above-mentioned tightening operation, even if the force is strong, it is possible to prevent the excessive press-contact force from being applied to the connecting end faces 31a ', 31b', 32a ', 32b' by the elasticity. This has the effect of preventing chipping of elements due to overtightening as described above.

In addition, in the case of attachment to the distribution line 95 as described above, the holding body 10 is turned around the hinge, and the connecting end faces 32a 'and 32b' of the second element 32 are connected to the first element 31. In the case of contact with the end surfaces 31a 'and 31b', the holding member 10 may be tilted as shown in FIG. The second element 32, which is pressed only at the intermediate portion, has the guide member 40
When the element 31 is brought into contact with the element 31, the orientation can be changed to a direction compatible with the first element 31 by lightening as shown in FIG. 6. As a result, the connecting end faces 32 a ′ and 32 b ′ of the second element 32 are connected There is also an effect that the predetermined end surface 31a 'and 31b' can be superimposed exactly on the connecting end surfaces 31a 'and 31b' so that the predetermined magnetic characteristics can be exhibited.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a partially broken front view of a ground fault accident point indicator display, FIG. 2 is a front view for explaining attachment to an electric wire, and FIG. Top view of the body,
FIG. 4 is a cross-sectional view taken along the line IV-IV, FIGS. 5 and 6 are schematic cross-sectional views illustrating the state of the current transformer core 30 in the process of covering the presser body on the distribution line, and FIG. FIG. 8 is an exploded perspective view of the display device, FIG. 9 is a perspective view of the display device in a normal state, and FIG. 10 is a perspective view of the display device in a display state. 2 ... Detection unit, 3 ... Display unit, 4 ... Base, 10 ... Presser body, 30 ... Core of current transformer, 31 ... First element, 32 ... Second
Element, 37 ... biasing spring.

Continued on the front page (72) Inventor Masahiro Oikawa 3-7-1, Ichibancho, Sendai City, Miyagi Prefecture Tohoku Electric Power Co., Inc. (72) Inventor Ryosaku Nakata 35 Shinkanma, Nagagusa-cho, Obu City, Aichi Prefecture Japan High Voltage Electric Stock (72) Inventor Masayuki Ota 35, Fukuma, Nagakusa-cho, Obu City, Aichi Prefecture Inside the Technical Research Institute of Japan High Voltage (72) Inventor Yuichi Kubo 35, Fukuma, Nagakusa-cho, Obu City, Aichi Japan Technology In the laboratory

Claims (1)

(57) [Claims] 1. A detection unit which is attached to a distribution line to detect a detection signal current flowing through the distribution line and output a detection signal, and display and operate upon receiving the detection signal. A display unit, and the detection unit has a base body and a pressing body that are located below and above the distribution line, respectively, and a distribution line that is positioned between the base body and the pressing body. On both sides of the storage space, there are two fasteners for respectively pressing the pressing body against the base body, and the base body has an annular shape for surrounding the periphery of the storage space of the distribution line. U-shaped first in current transformer core
An element is provided with the two connecting end faces thereof facing upward, and the first element is provided with a detection coil, while the holding body is provided with the annular current transformer core. Is provided such that the two connecting end faces of the second element are brought into contact with the two connecting end faces of the first element by fastening the pressing body to the base. In the ground fault accident point exploration indicator, one of the above-mentioned fasteners is configured with a butterfly fastener that hinges the presser body to the base body in a freely openable and closable state, and the other one has one end connected to the base body. The other end is configured by an engaging rod adapted to be engaged with the pressing body, and the state of attachment of the second element to the pressing body is such that the second element is located on the side of the base with respect to the pressing body. And the second element rotates in the longitudinal direction of its own base. Focusing Yes the tip of the leg portions are configured so as to allow tilting, yet the middle part of the back of the opposite to the connecting end surface of said second element, the second
An urging spring, which urges the element toward the base, is elastically contacted with the urging spring, and further around the connecting end face of the second element or the first element, A ground fault point exploration indicator provided with a guide member for guiding the second element so that the connecting end face of the second element overlaps the connecting end face.