JP5164820B2 - Plug attachment / detachment auxiliary jig - Google Patents

Description

  The present invention relates to a plug attaching / detaching auxiliary jig, and is particularly useful for attaching / detaching a test plug to / from a test terminal.

  Test plugs are used to check the operation of relays, which are protective devices for power systems. This type of test plug is used by inserting it into a test terminal that is arranged on the switchboard and connected between the power supply side and the load side of the system when performing inspection work on the relay on the load side. Here, the test terminal includes a CT test terminal whose power supply side is connected to a CT (current transformer) and a PT test terminal whose power supply side is connected to a PT (instrument transformer). . In response to this, there are two types of test plugs: a CT test plug that is used by inserting a test plug into a CT test terminal, and a PT test plug that is used by inserting it into a PT test terminal. Is prepared.

  FIG. 6 is a perspective view showing the CT test plug as viewed from the rear. As shown in the figure, a test plug 30 for CT is provided on each of the phases (B phase, W in the figure) on an insulating plate 32 protruding from a rear insulating support 39 that is integrally continuous with the insulating support 31. Corresponding to each of a pair of power supply side conductors 35B, 35W, 35R, 35N and a load that are insulated from each other in the vertical direction. The side conductors 45B, 45W, 45R, and 45N are juxtaposed, and their base ends are connected to four sets of terminals 37 and 47 that are arranged coaxially. Here, the insulating support 31 is a member having the maximum contour among the members constituting the test plug 30, and has a step portion 31 </ b> A formed between the insulating support 31 and the rear insulating support 39. Further, adjacent phases of the test plug 30 (B-W phase, WR phase, RN phase) are insulated by an insulating member 33. Further, protrusions 341 and 342 unique to the CT test plug 30 are formed at the tip of the insulating member 33 that insulates the phases at both ends (between the B-W phase and the RN phase).

  In order to avoid the secondary side of each phase (B-phase, W-phase, R-phase) of CT being opened, the test plug 30 is formed by, for example, connecting and connecting four terminals 37 with a plurality of short-circuit pieces 38. The conductors 35B, 35W, 35R, and 35N on the power source side are short-circuited, and a test device (not shown) or the like is connected to the other terminal 47 for a predetermined test or measurement.

  On the other hand, a PT for detecting an abnormal voltage drop on the power source side at the time of an accident or the like is usually provided in the power system, and such PT is also connected via the test terminal for PT arranged on the switchboard as described above. It is connected to a predetermined relay. The basic structure of the test terminal for PT and the test terminal for CT is the same, and the basic structure of the test plug for PT and the test plug 30 for CT is also the same. A structural contrivance is made so that the PT test plug is not inserted into the test terminal, and conversely, the CT test plug 30 is not inserted into the PT test terminal.

  FIG. 7 is a perspective view showing a state in which a test plug for PT is viewed from the rear. As shown in the figure, in the PT test plug 40, a protrusion 44 unique to the PT test plug 40 is provided at the tip of an insulating member 43 that insulates the center phase (W-R phase). The protrusions 341 and 342 of the CT test plug 30 are not provided at the tip of the insulating member 43 that insulates the phases (B-W phase, RN phase) at both ends. Since the test plug 40 has the same configuration as that of the test plug 30 shown in FIG. 6 except for the insulating member 43 and the convex portion 44, the corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 8 is an explanatory diagram for explaining the relationship between the convex portion of the CT test terminal and the convex portion of the CT test plug, and FIG. 9 is the convex portion of the PT test terminal and the convex portion of the PT test plug. It is explanatory drawing for demonstrating the relationship with a part.

  In the test terminal 50 shown in FIG. 8A, no protrusions are formed at positions corresponding to the protrusions 341 and 342 of the test plug 30 shown in FIG. 8B, and the protrusion 44 of the test plug 40 is formed. The convex part 51 is formed in the position corresponding to. On the other hand, in the test terminal 60 shown in FIG. 9A, no convex portion is formed at a position corresponding to the convex portion 44 of the test plug 40 shown in FIG. 9B, and the convex portion 341 of the test plug 30 is formed. , 342 are formed at positions corresponding to.

  Thus, even if the PT test plug 40 is erroneously inserted into the CT test terminal 50, the convex portion 51 and the convex portion 44 interfere with each other, and the PT test terminal 60 is erroneously inserted into the CT test plug 30. Even if it is going to insert, the convex parts 611 and 612 and the convex parts 341 and 342 interfere, and neither can be inserted.

  FIG. 10 is an explanatory view showing an aspect when the test plug inserted into the test terminal is pulled out. As shown in the figure, when pulling out, the operator holds the insulating support 31 with the hand 70 through the step portion 31A of the test plug 30 and pulls it out in the right direction in the figure. On the other hand, at the time of insertion, the test plug 30 is inserted into the test terminal 50 (see FIG. 8) until the rear end surface of the rear insulating support 39 comes into contact with the switchboard surface 80 (more precisely, the test terminal 50 disposed on the switchboard).

  As described above, the test plug 30 must be pulled out from the test terminal 50 while holding the step 31A of the insulating support 31. As a result, particularly when the test terminals are arranged at a high density on the switchboard, it is difficult to pull out by inserting the hand 70 between the test plugs 30 inserted adjacent to each other. I have been invited. In addition, as shown in FIG. 11, depending on the type of test, an electric meter 90 may be connected between the power supply side terminal 37 and the load side terminal 47 via conductors 91 and 92. In this case, Since the conducting wire 91 is a conductor on the live wire side, there is a risk of electric shock when the hand 70 touches it. The probability of such an electric shock accident increases as the interval between adjacent test plugs 30 decreases.

In addition, Patent Document 1 reduces the burden on the test operator for preventing electric shock without preparing a voltage detector separately in connection with this type of test plug, and facilitates voltage detection work. A withstand voltage test jig is disclosed.
JP 09-304469 A

  As described above, the test plug 30 has a problem in workability particularly including the possibility of an electric shock accident at the time of pulling out, and the improvement thereof has been desired. Therefore, in order to meet the demand for high density mounting of the test plug 30 which has become more and more prominent in recent years, the workability of pulling out the test plug from the test terminal and inserting the test plug into the test terminal has been improved. It is important to plan.

  FIG. 8 shows the CT test plug 30, but the above description regarding the drawing operation and workability also applies to the PT test plug 40. This is because they are the same except for the arrangement positions of the convex portions 341, 342, 44.

  An object of the present invention is to provide a plug attaching / detaching auxiliary jig capable of performing a predetermined attaching / detaching operation of a plug with respect to a terminal from a position away from a charging portion.

  A first aspect of the present invention that achieves the above object is a mounting auxiliary jig for gripping a plug constituting a predetermined electric circuit by being inserted into a terminal and attaching and detaching the plug to and from the terminal. A frame having an opening into which the plug can be inserted and extending in the axial direction; a fixed handle fixed to the frame at an end opposite to the opening; and movable in the axial direction A movable handle supported by the frame, a biasing member that biases the movable handle toward the opening, and one end connected to the movable handle along the axial direction of the frame An operation rod extending toward the opening, a fixed holding piece fixed to the frame so as to abut the front surface of the plug inserted into the frame and restrict the movement of the plug toward the movable handle, The opening of the frame. A base end portion is rotatably supported by the end portion on the portion side, and the other end portion of the operation rod is connected to rotate in one direction as the movable handle moves toward the fixed handle side. By abutting and abutting on the rear surface of the plug inserted into the frame body, and rotating in the opposite direction as the movable handle moves toward the opening due to the biasing force of the biasing member. A plug attachment / detachment assisting jig having a movable holding piece that falls and opens the opening.

  In this embodiment, when the frame body is pushed into the plug through the opening while the movable holding piece is tilted, the plug comes into contact with the fixed holding piece and stops. In this state, the movable holding piece is raised through the operation rod by pulling the movable handle toward the fixed handle. As a result, the movable holding piece comes into contact with the rear surface of the plug, so that the plug can be held between the fixed holding piece and the movable holding piece. That is, the plug can be gripped by the frame. When the plug is inserted into the terminal via the frame in such a gripping state, the insertion of the plug into the terminal is completed, and when the plug is pulled out from the terminal, the extraction of the plug from the terminal is completed.

  According to a second aspect of the present invention, in the plug attachment / detachment auxiliary jig described in the first aspect, the terminal is disposed on the switchboard and connected between the power supply side and the load side of the system. The plug includes a power-side conductor and a load-side conductor that are in contact with a plurality of conductors of the test terminal, respectively, on opposite surfaces of the insulating member for each phase. The test plug is attached to and detached from the front surface, and the front surface in contact with the fixed holding piece is a front surface of an insulating support that is a member having a maximum contour among the members constituting the test plug, and the movable holding piece. The rear surface abutted on the plug is a rear surface of the insulating support, and is provided in the plug attachment / detachment assisting jig.

  According to this aspect, the insulating support can be clamped by the frame body by pulling the movable handle, whereby the test plug can be gripped. In this state, the test plug can be easily attached to and detached from the test terminal through the frame.

  According to a third aspect of the present invention, in the plug attachment / detachment assisting jig described in the first or second aspect, the connecting portion between the other end of the operation rod and the movable holding piece is the movable holding piece. The plug attachment / detachment assisting jig is provided inside the frame body with respect to the rotation center.

  According to this aspect, since the operating point of the operating force at the time of the standing operation of the movable holding piece is located above the movable holding piece from the center of rotation, the movable holding piece can be operated with a smaller operating force. Can stand up.

  According to the present invention, it is possible to perform predetermined plug attachment / detachment work on the terminal from a position away from the charging portion, and even when the intervals between the test plugs are narrowed as a result of insertion of the test plugs into a large number of test terminals. The attachment / detachment can be performed without inserting an operator's hand for attachment / detachment between the test plugs. As a result, it is possible not only to reduce the possibility of an operator's electric shock during the plug attachment / detachment operation, but also to efficiently perform the attachment / detachment operation in a narrow portion.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a side view showing an attachment / detachment assisting jig according to an embodiment of the present invention in a state before inserting a test plug, FIG. 2 is a side view showing the state in which a test plug is inserted, and FIG. 3 is a plan view thereof. 4 is a view taken along the line AA ′ in FIG. 2, FIG. 5 is a diagram showing each part extracted, (a) is an enlarged view of a portion B in FIG. 1, and (b) is a view taken along the C line. FIG. 2C is an enlarged view of a portion D in FIG. Although this embodiment will be described as an attachment / detachment auxiliary jig for the CT test plug 30, it can be applied to the PT test plug 40 as it is. This is because they are the same except for the arrangement positions of the convex portions 341, 342, 44.

  As shown in FIGS. 1 to 5, the frame body 1 is composed of four columnar members extending in the axial direction, has a rectangular outer shape larger than the contour of the insulating support 31, and inserts the test plug 30. It has an opening 1A to obtain. That is, the rectangular contour shape inscribed in the opening 1A is formed to be the same as or larger than the contour shape of the insulating support 31 that is the member having the largest contour among the members constituting a part of the test plug 30. It is.

  The fixed handle 2 is fixed to the frame 1 at the end opposite to the opening 1A. The movable handle 3 is supported by the frame 1 so as to be movable in the axial direction of the frame 1 (left-right direction in FIG. 1). As shown in FIG. 5C, the movable handle 3 is engaged with one end of a spring 4 as a biasing member. The other end of the spring 4 is locked to the frame 1 on the opening 1 </ b> A side of the frame 1. Thus, even if the movable handle 3 is pulled in the axial direction of the frame 1 by pulling the movable handle 3 to the fixed handle 2 side (left direction in FIG. 1) against the spring force of the spring 4 by applying the operation force, the operation force The movable handle 3 is moved in the reverse direction (right direction in FIG. 1) along the axial direction of the frame body 1 by the restoring force of the spring 4 acting by releasing the movement and returns to the original position (origin position). It is.

  As clearly shown in FIG. 5 (c), the operation rod 5 has one end connected to the movable handle 3 and extends in the axial direction of the frame 1 toward the opening 1 </ b> A in this state. The other end of the operation rod 5 is connected to the movable holding piece 6. As clearly shown in FIG. 5A, the movable holding piece 6 is supported by the end portion on the opening 1 </ b> A side of the frame body 1 via a pin 7 so as to be rotatable. Thus, as described above, when the movable handle 3 is pulled and moved to the fixed handle 2 side, the pin 7 is rotated in one direction (counterclockwise) around the rotation center, and as a result, it stands up. As shown in FIGS. 2 and 3, they contact the rear surface of the insulating support 31 of the test plug 30 inserted in the frame 1. On the other hand, when the movable handle 3 is moved to the opening 1A side by the action of the restoring force of the spring 4 with the release of the operating force, it returns to the origin position to rotate in the reverse direction (clockwise), and FIG. As shown, it falls down and opens the opening 1A. Here, as clearly shown in FIG. 5B, the movable holding piece 6 is provided on the inner side of the frame body 1 with respect to the rotation center defined by the position of the pin 7. As a result, the operating point of the operating force during the standing operation of the movable holding piece 6 is located above the movable holding piece 6 with respect to the rotation center, and therefore the movable holding piece 6 can be operated with a smaller operating force. Can stand up.

  The fixed holding piece 9 is fixed to the frame 1 so as to contact the front surface of the insulating support 31 of the test plug 30 inserted into the frame 1 and to restrict the movement of the test plug 30 toward the movable handle 3.

  When attaching / detaching the test plug 30 using such an attachment / detachment auxiliary jig, first, as shown in FIG. 1, the movable holding piece 6 is tilted and the opening 1A is opened through the opening 1A. The test plug 30 is inserted into the frame body 1. Such insertion is performed until the front surface of the insulating support 31 of the test plug 30 contacts the fixed holding piece 9. After the front surface of the insulating support 31 comes into contact with the fixed holding piece 9, the movable holding piece 6 is raised through the operation rod 5 by pulling the movable handle 3. As a result, the movable holding piece 6 comes into contact with the rear surface which is the step portion 31 </ b> A of the insulating support 31, so that the test plug 30 can be held between the fixed holding piece 9 and the movable holding piece 6. That is, the test plug 30 can be gripped remotely via the frame 1. When the test plug 30 is inserted into the test terminal 50 (see FIG. 8) via the frame 1 in such a gripping state, the insertion of the test plug 30 into the test terminal 50 is completed, and the test is performed when the test plug 30 is pulled out from the test terminal 50. Removal of the test plug 30 from the terminal 50 is completed.

  Thus, according to the present embodiment, the predetermined plug plug 30 can be attached to and detached from the test terminal 50 from a position away from the charging portion, and the interval between the test plugs 30 inserted into a large number of test terminals 50 is narrow. Even if it is, it is possible to perform a predetermined attaching / detaching operation without inserting an operator's hand for attaching / detaching between adjacent test plugs 30. As a result, it is possible not only to reduce the possibility of an electric shock by an operator when attaching and detaching the test plug 30, but also to efficiently perform this even when attaching and detaching a narrow portion. it can.

  Although the above embodiment has been described as an auxiliary jig for attaching and detaching the test plugs 30 and 40, the present invention is not limited to this. There is no other condition as long as it has a part that can be gripped by the attaching / detaching auxiliary jig when attaching to and detaching from the terminal. Here, the opening part of the attachment / detachment auxiliary jig generally only needs to have a shape larger than the outer shape of the member having the maximum contour among the members constituting a part of the plug.

  The present invention can be used in the industrial field relating to operation and maintenance of the power system.

It is a side view which shows the attachment / detachment jig | tool which concerns on embodiment of this invention in the state before inserting a test plug. It is a side view which shows the attachment / detachment jig | tool which concerns on embodiment of this invention in the state which inserted the test plug. It is a top view which shows the attachment / detachment jig | tool which concerns on embodiment of this invention in the state which inserted the test plug. FIG. 3 is a view taken along line A-A ′ of FIG. 2. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which extracts and shows each part of the attachment / detachment auxiliary jig which concerns on embodiment of this invention, (a) is an enlarged view of the B section of FIG. 1, (b) is the C line arrow directional view, (c) is It is an enlarged view of D part. It is a perspective view which shows the state which looked at the test plug for CT from back. It is a perspective view which shows the state which looked at the test plug for PT from back. It is explanatory drawing for demonstrating the relationship between the convex part of the test terminal for CT, and the convex part of the test plug for CT. It is explanatory drawing for demonstrating the relationship between the convex part of the test terminal for PT, and the convex part of the test plug for PT. It is explanatory drawing which shows the aspect at the time of pulling out the test plug inserted in the test terminal arrange | positioned at the switchboard. It is explanatory drawing which shows the aspect of the test thru | or measurement performed by mounting a test plug in the test terminal arrange | positioned at the switchboard.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 1A Opening part 2 Fixed handle 3 Movable handle 4 Spring 5 Operation rod 6 Movable holding piece 7 Pin 9 Fixed holding piece 30 Test plug 31 Insulating support 31A Step part 32 Insulating plate 33 Insulating member 37, 47 Terminal 40 Test plug 43 Insulating member 50 Test terminal 60 Test terminal 80 Switchboard surface 90 Electric meter

Claims (3)

An attachment / detachment assisting jig for attaching and detaching the plug to and from the terminal by gripping a plug constituting a predetermined electric circuit by being inserted into the terminal,
A frame having an opening into which the plug can be inserted and extending in the axial direction;
A fixed handle fixed to the frame at the opposite end of the opening;
A movable handle supported by the frame so as to be movable in the axial direction;
A biasing member that biases the movable handle toward the opening,
An operation rod having one end connected to the movable handle and extending toward the opening along the axial direction of the frame;
A fixed holding piece fixed to the frame so as to abut the front surface of the plug inserted into the frame and restrict movement of the plug toward the movable handle;
A base end portion is rotatably supported at an end portion of the frame body on the opening portion side, and the other end portion of the operation rod is connected to the frame body in one direction as the movable handle moves toward the fixed handle side. While rotating up to abut against the rear surface of the plug inserted into the frame, the moving handle moves toward the opening due to the biasing force of the biasing member. And a movable holding piece that falls by rotating to open the opening. In the plug attachment / detachment auxiliary jig according to claim 1,
The terminal is a test terminal disposed on the switchboard and connected between the power supply side and the load side of the system,
The plug includes a power-side conductor and a load-side conductor that are in contact with the plurality of conductors of the test terminal, respectively, on opposite surfaces of the insulating member for each phase, and is attached to and detached from the test terminal. Test plug
The front surface in contact with the fixed holding piece is a front surface of an insulating support that is a member having a maximum contour among members constituting the test plug,
The plug attachment / detachment assisting jig is characterized in that a rear surface in contact with the movable holding piece is a rear surface of the insulating support. In the plug attachment / detachment auxiliary jig according to claim 1 or 2,
The plug attaching / detaching auxiliary jig, wherein a connecting portion between the other end of the operating rod and the movable holding piece is provided inside the frame body with respect to a rotation center of the movable holding piece.

Images