JP5769984B2 - Manual contact switching system - Google Patents

Description

  The present invention relates to a manual contact switching system with a grounding function that opens and closes (cuts in) contacts of a disconnector and other switchgears, and relates to a technique capable of reliably performing a grounding operation.

  When checking cubicle-type high-voltage power receiving equipment and other power receiving / transforming equipment, the operator shuts off the load current with a circuit breaker so that the inspection work can be carried out, then opens the disconnector and puts the inspection point in a non-voltage state. In addition, work grounding is attached to the main circuit conductor to ensure work safety and inspection is started. After the work is completed, the work ground is removed, and then the disconnector is turned on and the breaker is turned on to restore power.

  Work grounding is prepared by attaching a grounding hook-shaped ground hook, for example, to both ends of the ground lead wire, and sandwiching and fixing one ground hook at a predetermined position of the main circuit conductor, The other ground hook is sandwiched and fixed in a predetermined position (usually a ground conductor in the vicinity of the bottom surface side) of the housing (frame) of the cubicle type high-voltage power receiving equipment to be electrically connected. Further, after the work is completed, the work grounding is removed by removing the main circuit conductor and the ground hook attached to a predetermined position of the housing.

  As an apparatus for turning on / off the disconnector, an “electrically operated device” for opening / closing (cutting) the contact of the disconnector in accordance with an electrical switch operation, and a detachable operation targeted by the present invention There is a “manual operation device” that opens and closes the contacts of a disconnector by attaching a lever and rotating it manually.

JP 2000-340073 A

  As described above, after the inspection work is completed, the disconnecting switch is turned on after removing the working ground.However, if the disconnecting switch is turned on without removing the working ground accidentally, a ground fault will occur and the substation equipment will It can lead to damage and even serious accidents involving human life. Therefore, in order to prevent the occurrence of such an accident, in the case of an electric operation device, an operation lock function disclosed in Patent Document 1 or the like is added so that the disconnector is not turned on when the work is grounded. Yes.

  However, in the case of the manual operation device targeted by the present invention, there is no such operation lock function, and it is the current situation that the release of the work ground before the disconnector is turned on is entirely left to the operator's attention. Even in the manual operation device, there is a problem that it is desired to make a configuration in which the disconnector is not turned on in the working ground state.

In order to solve the above-described problems, the present invention includes (1) a manual operation device that opens and closes a contact of a switching device, and a grounding mechanism that is disposed around the manual operation device. The operating lever is detachably mounted on a mounting portion provided on the rotating shaft, and the operating lever is configured to open and close the contact by rotating forward and backward about the rotating shaft. A terminal plate case that is always grounded, and a terminal plate that is detachably attached to the terminal plate case, wherein the terminal plate is electrically connected to a main circuit connected to the switchgear, as the terminal plate to be mounted on the terminal board case the main circuit is grounded, in the contact open state, in a state of mounting the operation lever to the mounting portion, the terminal plate is the terminal plate by the operation lever It is attached to the case Prevents the, in the state in which the terminal plate and remove the operating lever is mounted on the terminal board case and configured to prevent the mounting of the operating lever with respect to the mounting portion to which the contact point is located at the open . The switchgear corresponds to a disconnector in the embodiment.

  In this invention, when the terminal plate is attached to the terminal plate case with the contact open (in the embodiment, the disconnector is open (cut)), the main circuit is grounded from the terminal plate via the terminal plate case. The In this state, since the operating lever cannot be mounted on the mounting portion, the rotating shaft cannot be rotated and the contact can be prevented from being switched from open to closed. Therefore, it is possible to prevent a ground fault from occurring by accidentally closing the contact of the switchgear when the main circuit is grounded.

  (2) A shutter that opens and closes the opening of the terminal plate case in conjunction with the rotation of the rotating shaft is provided, and when the contact is closed, the opening is closed to prevent the terminal plate from being attached to the terminal plate case. And when the said contact is open, it is good to comprise so that mounting | wearing to the said terminal board case is possible by opening an opening part. Opening the opening means that the terminal board can be inserted into the terminal board case, and closing the opening means that the terminal board cannot be inserted into the terminal board case. Therefore, in the present invention, the shutter does not need to contact the opening, and may be located at a predetermined position in front.

  In this way, the terminal plate cannot be inserted into the terminal plate case when the contact is closed, so there is a risk that the terminal plate may be accidentally attached to the terminal plate case when the contact is closed (before the contact is opened). It can be prevented beforehand.

  (3) It is good to provide the sensor which detects the presence or absence of mounting | wearing of the said terminal board to the said terminal board case. In the embodiment, the sensor is a micro switch, but a proximity sensor or other various sensors can be used. In this way, the terminal board mounting state can be notified from a predetermined output means based on the output of the sensor, so that the presence or absence of the terminal board, that is, the presence or absence of grounding (work grounding) can be more reliably notified. Can do.

  (4) It is good to provide the fixing mechanism which fixes the said terminal board with which the said terminal board case was mounted | worn. In the embodiment, the fixing mechanism is realized by a fixing screw 17a with a handle 17 or the like. In this way, it is possible to suppress as much as possible the possibility that the terminal plate will inadvertently leave the terminal case and the grounding will be released during inspection work or the like.

  In this invention, even if it is an opening-and-closing system which opens and closes a contact with a manual operation apparatus, it can suppress closing a contact accidentally before canceling | grounding grounding.

1 is an overall configuration diagram showing a preferred embodiment of the present invention. It is a side view which expands and shows the principal part. FIG. FIG. FIG. It is a side view which shows the modification 1. FIG. FIG. It is a side view which shows the modification 2. FIG.

[Basic configuration common to embodiments and modifications]
FIG. 1 shows a side view of a switchboard 1 in a cubicle type high voltage power receiving facility which is a preferred embodiment of the present invention. The disconnector 4 is inserted into the main circuit conductor 3 arranged at a predetermined position in the frame 2 constituting the outer wall of the switchboard 1. The disconnector 4 is linked to a manual operation device 9 disposed in the immediate vicinity of the frame 2 via a connecting rod 5. In conjunction with the operation of the manual operation device 9, “ON” and “OFF” of the disconnector 4 are switched.

  In other words, the manual operating device 9 is configured such that the operating lever 6 is detachably mounted, and the operating lever 6 is moved forward and backward with the distal end of the operating lever 6 being mounted, with the mounted portion of the distal end being the center. By rotating, the connecting rod 5 constituting the link mechanism follows the operation and moves along a predetermined locus, and the disconnecting device 4 is turned on / off (turned off). When the front side of the operation lever 6 (the operation handle portion of the operator) is positioned downward, the disconnector 4 is turned on and enters the “ON” state, and when the front side is positioned upward, the disconnector 4 is opened. To “OFF”. A specific structure for performing such an operation is as follows.

  As shown in FIGS. 2 to 5, a base plate 10 that extends in the vertical direction and is bent at an appropriate position is fixed to a connection plate 14 that is connected to the frame 2 at its upper and lower ends. The central portion 10a of the base plate 10 is configured to protrude to the side opposite to the attachment surface of the connecting plate 14. A flat plate-shaped holding plate 12 is attached to the central portion 10 a via a plurality of support columns 13. And the rotating shaft 11 is attached so that forward / reverse rotation is possible so that this center part 10a and the holding plate 12 may be crossed. As shown in FIG. 5, a hole 11 a serving as a mounting portion for the operation lever 6 is provided at a predetermined position on the peripheral surface of the rotating shaft 11. The tip of the operating lever 6 is inserted into the hole 11a, and the rotating shaft 11 and the operating lever 6 are integrated. The tip of the rotating shaft 11 a protrudes outside the holding plate 12, and the tip is connected to the connecting lever 5 a that forms the link of the connecting rod 5. Here, it is fastened by bolts and nuts, and the rotating shaft 11 and the connecting lever 5a rotate integrally. That is, the relative angle between the hole 11 a (operation lever 6) of the rotation shaft 11 and the connection lever 5 a is fixed, and when the rotation shaft 11 is rotated by the operation lever 6, the connection lever 5 a also rotates around the rotation shaft 11. Along with this, the connecting rod 5 moves to form a link together with the connecting lever 5a and other parts, and controls the “on” and “off” of the disconnector 4.

In other words, the rotating shaft 11 rotates in accordance with the rotating operation of the operation lever 6 for turning on / off the disconnector 4. When the disconnector 4 is “cut”, the hole 11a provided in the rotary shaft 11 is also located at the first position facing diagonally upward, and when the disconnector 4 is “cut”, the hole provided in the rotary shaft 11 is located. 11a is also located at the second position facing diagonally downward. Since this configuration is conventionally known, detailed description thereof is omitted.

[Features of the embodiment]
Here, in the present embodiment, a terminal plate case 15 that is always connected to the ground conductor of the frame 2 is provided in the vicinity of the manual operation device 9. The operating lever 6 is operated to rotate the rotary shaft 11 to open the disconnector 4 (see FIGS. 4 and 5). By removing the operation lever 6 from this state, the terminal plate 20 can be attached to the terminal plate case 15.

  Therefore, a grounding auxiliary tool provided with an alligator clip-shaped ground hook 8 at one end of the ground lead wire 7 and a flat terminal board 20 at the other end is prepared, and the ground hook 8 is connected to the main circuit conductor 3. The terminal board 20 is attached to the terminal board case 15 while being sandwiched and conducted. Since the terminal board case 15 and the terminal board 20 are made of metal conductors, the main circuit conductor 3 → the earth hook 8 → the ground lead wire 7 → the terminal by attaching the terminal board 20 to the terminal board case 15 The main circuit conductor 3 is grounded because it is electrically connected to the ground conductor of the board 20 → terminal board case 15 → frame 2 (assuming that the disconnector 4 is open as described above).

  The terminal plate case 15 is composed of an L-shaped plate, and the bent tip 15b is brought into surface contact with a predetermined position of the frame 2 and fixed in that state using bolts, nuts, or the like. When the tip 15b is brought into contact with the ground conductor of the frame 2, electrical conduction can be performed simultaneously with the mechanical fixing by the bolts and nuts. When the tip 15b of the terminal board case 15 does not contact the ground conductor, the lead conductor is used to conduct to the ground conductor.

  The terminal board case 15 includes guide rails 16 on the upper and lower sides thereof, and the terminal board 20 is guided and supported by the guide rails 16 and reciprocally moves along the longitudinal direction of the terminal board 20 in a detachable manner. Further, a fixing screw 17 a with a handle 17 is attached to the terminal case 15. A U-shaped notch 20a is formed at the tip of the terminal board 20 so as to coincide with the fixing screw 17a. Accordingly, when the terminal plate 20 is mounted on the terminal plate case 15, the fixing screw 17a enters the notch 20a. In this state, the handle 17 is rotated in a predetermined direction to tighten the fixing screw 17a. The terminal board 20 can be sandwiched between the terminal board case 15 and fixed. Therefore, it can be prevented that the terminal plate 20 is detached from the terminal plate case 15 and the working ground is released during the inspection work.

  When the terminal plate 20 is attached to the terminal plate case 15, the terminal plate 20 covers at least the front of the hole portion 11a at the first position so that the operation lever 6 cannot be attached to the hole portion 11a (see FIG. (See 2nd grade). Thereby, in the state of work grounding with the terminal plate 20 attached to the terminal plate case 15, the operating lever 6 cannot be attached to the hole 11a of the rotary shaft 11 located at the first position. Can not be turned on by turning on the disconnector 4. Therefore, before the disconnector 4 is inserted, it is necessary to remove the terminal plate 20 from the terminal plate case 15 as a previous process. By performing this process, the state of work grounding is canceled, so that it is possible to prevent the occurrence of an accident in which the disconnector 4 is erroneously turned on in the state of work grounding.

  Further, in the present embodiment, a through hole 15a is provided at a predetermined position of the terminal board case 15, and a micro switch 19 is provided on the rear side of the through hole 15a. The sensor part of the microswitch 19 is arranged in the through hole 15a. Thereby, when the terminal board 20 is attached to the terminal board case 15, the microswitch 19 detects the terminal board 20 and outputs a detection signal. Therefore, based on the detection signal, for example, a lamp (not shown) can be turned on, or a predetermined message can be output to the display panel.

  In the present embodiment, since the terminal plate case 15 and the terminal plate 20 are arranged in the vicinity of the manual operation device 9, that is, in the vicinity of the frame 2, the operator attaches the terminal plate 20 to the terminal plate case 15. It is easy to visually confirm whether or not it is done. Therefore, it is possible to check the presence / absence of work grounding, recognize whether it is suitable for the current state, and make an appropriate state.

[Modification 1] (with shutter)
In the above embodiment, when the terminal plate 20 is inserted into the terminal plate case 15, the operation lever 6 cannot be inserted into the hole 11 a of the rotating shaft 11, and the disconnector 4 is turned on in a working ground state. To prevent it from entering the “On” state. However, there remains a possibility that the terminal board 20 is mounted on the terminal board case 15 in a state in which the disconnector is “ON” and the working ground is brought about.

  Therefore, in the first modification, as shown in FIGS. 6 and 7, a shutter 25 that opens and closes the insertion side of the terminal plate 20 of the terminal plate case 15 is provided. That is, as shown by the solid line in the figure, when the operating lever 6 is positioned downward (the hole 11a is positioned at the second position) and the disconnector 4 is “ON”, the shutter 25 is connected to the terminal board case 15. It is located in front of the opening and closes. In this state, the terminal plate 20 cannot be inserted into the terminal plate case 15, so that when the disconnector 4 is “ON”, there is no accidental grounding.

The shutter 25 is linked to the rotary shaft 11, moves following the forward and reverse rotation of the rotary shaft 11, and rotates 90 degrees to two points that are closed by the position indicated by the solid line. A forward and reverse rotation is performed between positions where the opening of the terminal board case 15 indicated by a chain line is opened. Therefore, when the disconnector 4 is opened by lifting the front side of the operation lever 6 (the operation handle portion of the operator) upward, the opening of the terminal board case 15 is also opened, so that the terminal board 20 is inserted and the work grounding is performed. Can be performed.
In addition, since another structure and an effect are the same as that of embodiment mentioned above, the same code | symbol is attached | subjected to a corresponding member and the detail is demonstrated.

[Modification 2] (No micro switch)
8 and 9 show still another modification. The illustrated example is based on the above-described embodiment and has a configuration in which no microswitch is provided. This simplifies the configuration. In addition, since another structure and an effect are the same as that of embodiment mentioned above, the same code | symbol is attached | subjected to a corresponding member and the detail is demonstrated. In addition, although not specifically illustrated, a configuration without a micro switch may be employed in the type with a shutter shown in the first modification.

[Other variations]
In the embodiment and the modification described above, the hole 11a is provided in the rotating shaft 11 as the mounting portion, and the tip of the operation lever 6 is inserted into the hole 11a. A protrusion may be provided on the peripheral surface and a recess provided at the tip of the operation lever may be provided so that the protrusion and the recess coincide with each other. As described above, the mounting portion only needs to be able to connect the operation lever to the rotation shaft, and the shape thereof can take various structures as well as the hole portion and the protrusion.

[Application to other devices]
In the embodiment and the modification described above, an example in which the present invention is applied to a system that opens and closes a disconnect switch mounted on a cubicle type high-voltage power receiving facility has been described, but the present invention is not limited to this, and a load switch, a circuit breaker, The present invention can be applied to other various opening / closing devices. In addition, it does not matter whether the capacity is large or small, and the installation location can be applied to a power receiving facility, a power plant, a substation, or the like.

DESCRIPTION OF SYMBOLS 1 Switchboard 2 Frame 3 Main circuit conductor 4 Disconnector 5 Connecting rod 6 Operation lever 7 Grounding lead wire 8 Grounding hook 9 Manual operating device 10 Base plate 11 Rotating shaft 11a Hole part 12 Holding plate 13 Supporting plate 14 Connecting plate 15 Terminal board case 16 Guide Rail 17 Handle 17a Fixing screw 19 Micro switch 20 Terminal board 20a Notch 25 Shutter

Claims (4)

A manual operation device for opening and closing the contact of the switchgear; and
A grounding mechanism disposed around the manual operation device,
The manual operation device is configured such that an operation lever is detachably attached to a mounting portion provided on a rotation shaft, and the contact is opened and closed by rotating the operation lever forward and backward about the rotation shaft. ,
The grounding mechanism includes a terminal plate case that is always grounded, and a terminal plate that is detachably attached to the terminal plate case,
The terminal plate is electrically connected to a main circuit connected to the switchgear, and when the terminal plate is attached to the terminal plate case, the main circuit is grounded,
In the state where the contact lever is open and the operation lever is attached to the attachment portion, the operation lever prevents the terminal plate from being attached to the terminal plate case , and the operation lever is removed to remove the terminal. A manual contact opening / closing system configured to prevent the operation lever from being attached to the attachment portion located when the contact is open when the plate is attached to the terminal plate case. Provide a shutter that opens and closes the opening of the terminal board case in conjunction with the rotation of the rotating shaft,
When the contact is closed, the opening is closed to prevent the terminal plate from being attached to the terminal plate case, and when the contact is open, the opening is opened to allow the terminal plate to be attached to the terminal plate case. The manual contact switching system according to claim 1, wherein the system is configured as follows.   The manual contact switching system according to claim 1 or 2, further comprising a sensor for detecting whether or not the terminal plate is attached to the terminal plate case.   The manual contact switching system according to any one of claims 1 to 3, further comprising a fixing mechanism for fixing the terminal plate mounted on the terminal plate case.

Images