JPH11353982A - Grounding confirmation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an operation error of a disconnector at the time of attaching a grounding metal fitting in grounding so as to enhance safety of both an operator and equipment. SOLUTION: This grounding confirmation device for confirming grounding is provided in a disconnector in which an output shaft 6 is turned by a prescribed angle by an electric motor so as to perform an on/off operation. This grounding confirmation device has a stopper 10 fixed to the output shaft 6, and a grounding conductor 15 disposed near the output shaft 6. When a grounding metal fitting 18 is attached to the grounding conductor 15 at the time of grounding, the stopper 10 abuts on the grounding metal fitting 18 so as to prevent turning of the output shaft 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground checking device capable of easily checking a working ground in response to a power outage at a power plant, a substation or a switchyard.

[0002]

2. Description of the Related Art Generally, in order to ensure the safety of personnel and equipment during power outage work such as inspection of equipment at a substation, grounding for work is always required. When a working ground is attached to a substation where the charged part is exposed, there are two types of attaching methods: mechanical grounding with a grounding disconnector and working grounding with a grounding tool.

[0003] The mechanical grounding by the grounding disconnector is a method in which a switch is turned on by opening a line and grounding is automatically turned on. In addition, for work grounding with the above-mentioned grounding tool, after the line is opened, a grounding metal that is electrically connected to the line is attached to a grounding ground conductor installed in the substation, and the grounding metal is connected to the grounding metal. And grounding via a ground conductor.

[0004]

The mechanical grounding by means of the above-mentioned grounding disconnector has no problem because it takes into account the electrical and mechanical interlocking conditions. Since there is no electrical or electrical interlock device installed, the grounding bracket can be attached and detached at any place, but on the other hand, when the disconnector is operated, power is erroneously transmitted to the grounded line, and the substation Power outages could cause supply disruptions and could result in personal injury.

The present invention has been made in view of the above-mentioned circumstances, and in work grounding using a grounding tool, a grounding check which prevents erroneous operation of a disconnector when mounting a grounding bracket and enhances safety of persons and equipment. It is intended to provide a device.

[0006]

According to a first aspect of the present invention, there is provided a disconnecting switch for turning on and off an output shaft by inverting a predetermined angle by driving an electric motor. A grounding confirmation device for confirming a working ground, comprising: a stopper fixed to the output shaft; and a grounding ground conductor disposed near the output shaft. When the grounding metal is attached to the grounding conductor, the stopper comes into contact with the grounding metal to prevent the output shaft from being inverted.

According to the first aspect of the invention, when the grounding metal is attached to the grounding ground conductor in the working ground, the stopper comes into contact with the grounding metal to prevent the output shaft of the electric motor from being inverted. Only after removing the grounding metal from the grounding ground conductor, it becomes impossible to operate the disconnector. Thereby, it is possible to prevent erroneous operation of the disconnector at the time of mounting the grounding bracket.

According to a second aspect of the present invention, in the grounding confirmation device according to the first aspect, the stopper is a mechanism lock plate movable to the grounding ground conductor by reversing a predetermined angle of the output shaft. .

According to a third aspect of the present invention, in the grounding confirmation device according to the second aspect, the mechanism lock plate is formed in a substantially sector shape, and a notch groove is formed in an outer peripheral end thereof.

According to a fourth aspect of the present invention, in the grounding confirmation device according to the second or third aspect, the mechanism lock plate moves to the grounding ground conductor at the time of work grounding, and the mechanism grounding plate in the notch groove of the mechanism lock plate. A grounding fitting is attached to the grounding conductor.

According to the second to fourth aspects of the present invention, after the output shaft is inverted at a predetermined angle by the working ground and the mechanism lock plate is moved to the grounding ground conductor, the grounding in the cutout groove of the mechanism lock plate is performed. By attaching the grounding metal to the grounding conductor, the movement of the mechanism lock plate can be reliably prevented, and thus the output shaft can be prevented from being inverted.

According to a fifth aspect of the present invention, in the grounding confirmation device according to any one of the first to fourth aspects, the disconnection operation of the disconnector is performed at a position at a predetermined angle with respect to the mounting position of the mechanism lock plate to the output shaft. A grounding prevention cover for covering the grounding ground conductor when the line is energized.

According to the fifth aspect of the present invention, when the line is energized, the grounding prevention cover covers the grounding ground conductor, so that the grounding metal cannot be attached to the grounding ground conductor by erroneous operation. As a result, safety when the line is energized can be improved.

According to a sixth aspect of the present invention, in the grounding confirmation device according to any one of the first to fifth aspects, the grounding earth conductor is fixed on a gantry arranged near the output shaft. I do.

According to the sixth aspect of the invention, since the grounding conductor is fixed on the gantry, the mounting operation of the grounding bracket can be performed in a state where the worker stands, thereby facilitating the mounting operation. .

According to a seventh aspect of the present invention, in the grounding confirmation device according to the first aspect, the stopper is movable to the grounding ground conductor by reversing the output shaft by a predetermined angle, and is formed in a rod shape. Features.

According to the seventh aspect of the invention, since the stopper is formed in the shape of a bar, the manufacture and configuration are simplified.

According to an eighth aspect of the present invention, in the grounding confirmation device according to any one of the first to seventh aspects, the grounding earth conductor detects when a grounding metal fitting is attached in working grounding. And display means for obtaining the detection signal, emitting an electric signal and displaying the electric signal is provided on a gantry.

According to the eighth aspect of the present invention, when the grounding metal is attached to the grounding ground conductor in the work grounding, an electric signal is generated and displayed on the display means so that the work grounding is performed. Workers can easily recognize, and safety during power outage work can be further improved.
In addition, an electric signal is obtained by obtaining a detection signal of the detection means,
If this electric signal is used as an interlock for the operation circuit of the disconnecting switch, it is possible to electrically prevent erroneous operation of the disconnecting switch.

According to a ninth aspect of the present invention, there is provided an output shaft which is rotated by driving a cylinder, and a swing member which is connected to the output shaft and swings by rotating the output shaft. A grounding confirmation device that is provided in a disconnector that performs on / off operations by swinging a moving member and that checks work grounding, wherein a grounding ground conductor is arranged in a swinging locus of the swinging member. When a grounding bracket is attached to the grounding ground conductor during work grounding,
The swinging member abuts on the grounding fitting to prevent the rotation of the output shaft.

According to the ninth aspect of the present invention, when the grounding metal is attached to the grounding ground conductor in the work grounding, the swinging member abuts on the grounding metal to prevent the rotation of the output shaft of the cylinder. As a result, the disconnection switch cannot be turned on unless the grounding bracket is removed from the grounding ground conductor as in the first aspect of the invention. Thereby, it is possible to prevent erroneous operation of the disconnector at the time of mounting the grounding bracket.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a first embodiment of a ground checking device according to the present invention, FIG. 2 is a perspective view showing a state in which the output shaft of FIG. 1 is inverted, and FIG. 4 (A) and 4 (B) each show an installation state of the grounding confirmation device of FIG. 1, and FIG. 4 (A) is a front view showing a state where the line is energized. FIG. 4B is a front view showing a state when the track is opened, and FIGS. 5A and 5B are plan views of FIGS. 4A and 4B, respectively.

As shown in FIGS. 4A and 4B, the disconnector has a housing 1, which is fixed to a support member 2 and to which a wiring pipe 2a through which a drive cable or the like passes is connected. In addition, an electric motor 3 as a driving source for inverting and driving by 180 degrees is housed inside, and a rotating shaft of the electric motor 3 is connected to the speed reducer 4. The speed reducer 4 is operatively connected via a universal joint 5 to an output shaft 6 having a rectangular cross section. When the electric motor 3 is driven to rotate, the rotation speed is reduced by the speed reducer 4, and the output shaft 6 is inverted by 180 degrees via the universal joint 5.

A blade 8 is connected to an upper end of the output shaft 6 via a support insulator 7 as shown in FIG. The blade 8 is configured such that the output shaft 6 is inverted by 180 degrees,
The switch is brought into contact with and separated from the fixed contact portion 9 to perform an on / off operation of the disconnector.

Further, a mechanism lock plate 10 as a stopper and a grounding prevention cover 11 are fixed to the output shaft 6 at a position where the mechanism lock plate 10 and the grounding prevention cover 11 are at 180 degrees from each other (a position facing the output shaft 6) with two mounting bolts 12. Have been. Mechanism lock plate 1
The O and the grounding prevention lid 11 are each formed in a substantially fan-shaped flat plate, and V-shaped mounting recesses 10a and 11a are formed at the mounting end to the output shaft 6, respectively. On the outer peripheral end of the mechanism lock plate 10, three rectangular cutout grooves 13 are formed side by side for three phases.

On the other hand, a frame 14 having a height of about 1.2 m, which is assembled and fixed in a frame shape, is installed on the grounding surface adjacent to the disconnector housing 1. As shown in FIG. 3, a grounding ground conductor 15 formed by bending a copper plate
Are fixed by mounting bolts 16. The height of the grounding conductor 15 is set to be slightly lower than the height at which the mechanism lock plate 10 and the grounding prevention lid 11 are attached to the output shaft 6, and the length is set to be smaller than the mechanism locking plate 10 and the grounding prevention lid 11. The width is set to be substantially the same as the width of the tip portion.
As shown in FIG. 3, an earth conductor 17 is connected to the earth conductor 15, and the earth conductor 17 is inserted into the pipe 14a of the gantry 14 and grounded.

The mechanism lock plate 10 is connected to one of the output shafts 6.
When the output shaft 6 is rotated again by 180 degrees, the grounding prevention lid 11 is rotated and moved to the grounding ground conductor 15 by reversing the output shaft 6 by 180 degrees. From above.

Further, the grounding ground conductor 15 has a structure shown in FIG.
As shown in (3), three grounding brackets 18 are attached for three-phase use in the working ground, and these grounding brackets 18 are
Each has a thumbscrew 18a and a moving block 18b that moves in the tightening direction by tightening the thumbscrew 18a. By tightening or loosening the thumbscrew 18a, the moving block 18b is pressed against the grounding ground conductor 15. Alternatively, they can be separated and attached to and detached from the grounding ground conductor 15. One end of a grounding conductor 18c is connected to the grounding metal 18, and the other end of the grounding conductor 18c is connected to a line-side metal fitting (not shown) that is attached to the line in working ground.

Further, although not shown, a pressure sensor as a detecting means is embedded in the grounding ground conductor 15 along its longitudinal direction, and when the grounding bracket 18 is attached to the working ground by this pressure sensor. , And that effect is detected.

As shown in FIGS. 1 and 2, a display unit 19 is provided near the grounding conductor 14 of the gantry 13 as a display means. The display unit 19 displays the detection result of the pressure sensor. Display lamp (red lamp) 19
a, a display lamp (blue lamp) 19b, and a portion for extracting an electric signal are provided. The display lamp 19a lights when the grounding bracket 18 is attached to the grounding conductor 15 to indicate that the grounding is being performed.
9b lights up when the grounding bracket 18 is removed from the grounding ground conductor 15 to indicate that preparation is completed.

That is, in the working ground, the grounding fitting 1
When the grounding conductor 8 is attached to the grounding conductor 8, it is detected by the pressure sensor, and based on the detection signal, the display lamp 19a is turned on to notify the worker that the grounding is being performed. When the grounding bracket 18 is removed from the grounding ground conductor 15, this is detected by the pressure sensor, and the display lamp 19b is turned on based on the detection signal to inform the operator that preparation is completed. Inform. In this case, an electric signal is extracted based on the detection signal and can be used as an interlock for an operation circuit of a disconnector.

Next, the operation of the first embodiment will be described.

While the line is energized, as shown in FIGS. 1, 4 (A) and 5 (A), the grounding prevention cover 11 is rotated to the grounding ground conductor 15 to move the grounding ground conductor 15 from above. Covering. In this state, the worker cannot attach the grounding bracket 18 to the grounding ground conductor 15 by erroneous operation, so that safety during energization of the line can be achieved.

In order to make the working ground while the line is energized, first, the electric motor 3 is driven to rotate, the rotation speed is reduced by the speed reducer 4, and the output shaft 6 is turned by 180 degrees through the universal joint 5. Invert. Then, the blade 8 becomes 18
The disconnector is turned by a range in which it is separated from the fixed contact portion 9 (releases the joined state), for example, by 70 degrees, without being inverted by 0 degrees.

At the same time, when the output shaft 6 is inverted by 180 degrees, the mechanism lock plate 10 is rotated on the grounding ground conductor 15. Thereafter, grounding fittings 18 are attached to the grounding ground conductors 15 in the respective notched grooves 13 of the mechanism lock plate 10. In this case, the moving block 18b is moved in the direction of the grounding ground conductor 15 by tightening the thumb screw 18a, and the moving block 18b is pressed against the grounding grounding conductor 15, thereby connecting the grounding metal to the grounding grounding conductor 15. 18 is fixed.

When the grounding fitting 18 is attached to the work ground, the pressure sensor buried in the grounding ground conductor 15 detects the tightening pressure and the display is made based on the detection signal. Indicator lamp 1 of part 19
When 9a lights up, the operator is informed that grounding is being performed.

Therefore, even if the electric motor 3 is driven to rotate and the mechanism lock plate 10 is to be turned over, the grounding metal 18 is arranged in the rotation locus of the mechanism lock plate 10. By contacting,
Inversion of the output shaft 6 can be reliably prevented.

Accordingly, it is impossible to operate the disconnector only after removing the grounding member 18 from the grounding ground conductor 15. As a result, it is possible to prevent erroneous operation of the disconnector when the grounding bracket 18 is attached.

As described above, according to the first embodiment, when the grounding bracket 18 is attached to the grounding ground conductor 15 during work grounding, the mechanism lock plate 10 abuts on the grounding bracket 18 and the electric motor 3 By preventing the output shaft 6 from being inverted, it is mechanically impossible to operate the disconnector unless the grounding bracket 18 is removed from the grounding ground conductor 15. Thereby, erroneous operation of the disconnecting switch at the time of mounting the grounding bracket 18 can be prevented. Further, if the detection signal of the pressure sensor is obtained and an electric signal is taken out, and this electric signal is used as an interlock for an operation circuit of the disconnecting switch, the erroneous operation of the disconnecting switch can be electrically prevented.

Then, the earth conductor 1 for grounding is used as the ground for work.
By turning on the display lamp 19a of the display unit 19 when the grounding metal fitting 18 is attached to the 5, the worker can easily recognize that it is the work grounding, and the safety during power outage work is further enhanced. be able to.

Further, according to the first embodiment, the output shaft 6 is formed to have a rectangular cross section, so that the mechanism lock plate 1 is formed.
Positioning of 0 becomes easy.

Further, when the line is energized, the grounding prevention cover 11
Covers the grounding ground conductor 15, so that the grounding bracket 18 cannot be attached to the grounding ground conductor 15 by erroneous operation. As a result, safety when the line is energized can be improved.

Then, the grounding ground conductor 15 is set to about 1.2
By fixing the mounting bracket 14 on the mount 14 having a height of m, the mounting operation of the grounding bracket 18 can be performed while the worker is standing up, so that the mounting operation is facilitated.

In the first embodiment, the pressure sensor is used as the detecting means for detecting that the grounding bracket 18 is attached to the grounding ground conductor 15. However, the present invention is not limited to this. May be used.

In the first embodiment, the reversal angle of the output shaft 6 by the electric motor 3 is set to 180 degrees, but may be smaller than this. In short, the disconnector is turned on and off by reversing the output shaft 6 by a predetermined angle, and when the disconnector is turned off, the mechanism lock plate 10 rotates and moves on the grounding ground conductor 15. The same applies to the following second embodiment.

FIG. 6 is a perspective view showing a second embodiment of the grounding confirmation device according to the present invention. The same parts as those in the first embodiment will be described with the same reference numerals. The same applies to the following embodiments.

In the second embodiment, as shown in FIG. 6, the electric motor housed in the housing 1 of the disconnector is a motor which is driven to reverse by 180 degrees similarly to the first embodiment. The output shaft 20 has a circular cross section.

A cylindrical mounting member 21 formed by combining two semi-cylindrical bodies is fixed to the output shaft 20, and a rod-shaped stopper 22 protruding in the outer peripheral direction is fixed to the mounting member 21. .

The output shaft 20 on the housing 1
A grounding conductor 23 having an L-shaped cross section is fixed in the vicinity of, and a grounding bracket 18 is attached to the grounding conductor 23 by working ground.

Here, the fixing position of the grounding earth conductor 23 is set at a position where the stopper 22 comes into contact with the grounding metal 18 when the grounding metal 18 is attached to the grounding earth conductor 23. That is, when the grounding member 18 is attached to the grounding earth conductor 23, the grounding member 18 is positioned within the rotation locus of the stopper 22.

Therefore, when the grounding bracket 18 is attached to the grounding ground conductor 23 in the working ground, the stopper 2
The grounding bracket 18 is arranged in the rotation locus of No. 2 and the stopper 22 abuts on the grounding bracket 18, whereby the rotation of the output shaft 20 can be reliably prevented.

Thus, the disconnection switch cannot be turned on unless the grounding member 18 is removed from the grounding ground conductor 23. As a result, it is possible to prevent erroneous operation of the disconnector when the grounding bracket 18 is attached. Further, according to the second embodiment, since the stopper 22 is formed in a rod shape, the manufacturing and the configuration can be simplified.

In the second embodiment, the mounting position of the grounding earth conductor 23 is set so that the grounding metal fitting 18 is arranged within the rotation locus of the stopper 22 at the time of working grounding. However, the present invention is not limited to this. When the output shaft 20 is reversed in the input operation direction of the container, the stopper 22 may contact the grounding earth conductor 23.

FIG. 7 is a perspective view showing a third embodiment of the grounding confirmation device according to the present invention.

In the third embodiment, an air cylinder (not shown) is used as a drive source instead of the electric motor.
The air cylinder is housed in the housing 1 and its piston rod is operatively connected to the output shaft 24. By operating the air cylinder, the output shaft 24 is rotated by the expansion and contraction of the piston rod.

A center portion of a swing member 25 is mounted on the output shaft 24, and lower ends of operation pipes 26 are mounted on both ends of the swing member 25, respectively. These operation pipes 26 move up and down by the swing of the swing member 25,
Thus, the disconnector is turned on and off. Output shaft 2
A grounding conductor 15 for grounding, which is bent in the same manner as in the first embodiment, is fixed to the housing 1 in the vicinity of 4 and within the swing locus of the swing member 25.

Therefore, when the grounding bracket 18 is attached to the grounding ground conductor 15 in working grounding, one end of the swinging member 25 abuts on the grounding bracket 18 to prevent the rotation of the output shaft 24 of the cylinder. As a result, the disconnection switch cannot be turned on unless the grounding bracket 18 is removed from the grounding ground conductor 15 as in the first embodiment. Thereby, erroneous operation of the disconnecting switch at the time of mounting the grounding bracket 18 can be prevented.

[0059]

As described above, according to the first to fourth aspects of the present invention, when the grounding metal is attached to the grounding earth conductor during work grounding, the stopper comes into contact with the grounding metal and the electric motor By preventing the output shaft from reversing,
Only after removing the grounding metal from the grounding conductor, it is impossible to operate the disconnector. This prevents erroneous operation of the disconnector when the grounding bracket is attached, and enhances the safety of humans and equipment.

According to the fifth aspect of the present invention, when the line is energized, the grounding prevention cover covers the grounding ground conductor,
The grounding metal cannot be attached to the grounding conductor by mistake. As a result, safety when the line is energized can be improved.

According to the sixth aspect of the present invention, since the grounding earth conductor is fixed on the gantry, the worker can easily attach the grounding metal.

According to the seventh aspect of the present invention, since the stopper is formed in a rod shape, it is possible to simplify the manufacturing and the configuration.

According to the eighth aspect of the present invention, when the grounding metal is attached to the grounding ground conductor in the work grounding, an electric signal is generated and displayed on the display means, so that the work grounding is performed. Workers can easily recognize, and safety during power outage work can be further improved.
In addition, an electric signal is obtained by obtaining a detection signal of the detection means,
If this electric signal is used as an interlock for the operation circuit of the disconnecting switch, it is possible to electrically prevent erroneous operation of the disconnecting switch.

According to the ninth aspect of the invention, when the grounding metal is attached to the grounding ground conductor in the work grounding, the swinging member abuts on the grounding metal to prevent the rotation of the output shaft of the cylinder. Thereby, the same effect as the first aspect of the invention can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a grounding confirmation device according to the present invention.

FIG. 2 is a perspective view showing a state where the output shaft of FIG. 1 is inverted.

FIG. 3 is a perspective view showing a state where the output shaft of FIG.

4 (A) and 4 (B) are respectively a front view showing a state where the line is energized and a front view showing a state where the line is opened in the installation state of the grounding confirmation device of FIG. 1;

FIGS. 5A and 5B are FIGS. 4A and 4B, respectively.
FIG.

FIG. 6 is a perspective view showing a second embodiment of the grounding confirmation device according to the present invention.

FIG. 7 is a perspective view showing a third embodiment of the grounding confirmation device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Support member 2a Support pipe 3 Electric motor 4 Reduction gear 5 Universal joint 6 Output shaft 7 Support insulator 8 Blade 9 Fixed contact part 10 Mechanism lock plate (stopper) 10a Mounting recess 11 Grounding prevention lid 11a Mounting recess 12 Mounting Bolt 13 Notch groove 14 Mount 14a Pipe 15 Grounding ground conductor 16 Mounting bolt 17 Grounding conductor 18 Grounding fitting 18a Thumb screw 18b Moving block 18c Grounding conductor 19 Display part (display means) 19a Display lamp 19b Display lamp 20 Output shaft 21 Mounting member 22 Stopper 23 Grounding conductor 24 Output shaft 25 Swinging member 26 Operating pipe

Claims (9)

[Claims] 1. A grounding confirmation device provided in a disconnector for turning on and off an output shaft by inverting a predetermined angle by driving of an electric motor, and for confirming a working ground, said device being fixed to said output shaft. And a grounding conductor for grounding disposed near the output shaft, and when the grounding metal is attached to the grounding grounding conductor in the work grounding, the stopper contacts the grounding metal. A contact confirmation device for preventing the output shaft from reversing. 2. The ground check device according to claim 1, wherein
The grounding confirmation device, wherein the stopper is a mechanism lock plate movable to a grounding ground conductor by reversing a predetermined angle of the output shaft. 3. The ground check device according to claim 2, wherein
The grounding confirmation device, wherein the mechanism lock plate is formed in a substantially sector shape, and a cutout groove is formed in an outer peripheral end thereof. 4. The grounding confirmation device according to claim 2, wherein the mechanism lock plate moves to the grounding earth conductor at the time of working grounding, and the grounding metal is connected to the grounding ground conductor in the cutout groove of the mechanism locking plate. A grounding confirmation device, to which is attached. 5. The grounding confirmation device according to claim 1, wherein the grounding is performed at a predetermined angle with respect to a mounting position of the mechanism lock plate to the output shaft when the line is energized by an operation of connecting a disconnector. A grounding confirmation device, wherein a grounding prevention cover for covering a grounding conductor is attached. 6. The grounding confirmation device according to claim 1, wherein the grounding conductor is fixed on a pedestal arranged near the output shaft. 7. The ground check device according to claim 1, wherein
The grounding confirmation device, wherein the stopper is movable to the grounding ground conductor by reversing a predetermined angle of the output shaft, and is formed in a rod shape. 8. The grounding confirmation device according to claim 1, wherein the grounding conductor includes a detecting means for detecting when the grounding metal is attached in the working ground, and detecting the grounding metal. A grounding confirmation device, wherein display means for obtaining a signal, emitting an electric signal and displaying the signal is provided on a gantry. 9. An output shaft which is rotated by driving a cylinder,
A swinging member connected to the output shaft and swinging by the rotation of the output shaft, and provided in a disconnector for performing an on / off operation by swinging of the swinging member, for work grounding; A grounding conductor arranged in a swinging trajectory of the swinging member, and a grounding bracket is attached to the grounding grounding conductor for work grounding. A contact member that contacts the swing member to prevent rotation of the output shaft.