JP2012078250A - Connector for ground resistance measurement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connector for ground resistance measurement which can facilitate an operation of connecting/disconnecting an apparatus side terminal to/from a ground side terminal and can facilitate securement of waterproofness and dust resistance.SOLUTION: A connector 10 for ground resistance measurement provided to a ground wire of apparatus comprises: a terminal board 20 comprising a terminal 22A to which a ground wire 5A of an apparatus side is connected and a terminal 22B to which a ground wire 5B of a ground side is connected; a cover 30 which is attached to the terminal board 20 and includes measurement holes 36A, 36B; a contact plate 24 provided at the inside of the cover 30 so as to be able to be displaced between a connection position where the terminal 22A and the terminal 22B are connected and a disconnection position where the terminal 22A and the terminal 22B are disconnected; and an operation part 40 which comprises a grip part 44 provided at the outside of the cover 30 and a connection part 41 for connecting the grip part 44 and the contact plate 24 and which is operated when the contact plate 24 is displaced between the connection position and the disconnection position.

Description

  The present invention relates to a connector for measuring ground resistance.

  Known as a connector for measuring the grounding resistance provided on the grounding wire of equipment such as a transformer installed on a utility pole, one that connects and disconnects the terminal on the equipment side and the terminal on the grounding pole side by opening and closing the cover. (For example, refer to Patent Documents 1 and 2). In this connector for measuring ground resistance, clip portions are provided at both ends of the contact plate attached to the cover, and by opening and closing the cover, the clip portions are attached to and detached from the terminals so that the terminals on both sides are connected. Connected and disconnected.

JP-A-7-27800 JP 2003-185687 A

  By the way, when the connector for measuring the ground resistance is installed outside the utility pole, it is necessary to ensure waterproofness and dustproofness in order to prevent the terminals and contact plates from corroding due to the influence of wind and rain. In the above-mentioned connector for measuring the ground resistance, a complicated seal structure is required to ensure waterproofness and dustproofness by making the cover openable.

  The present invention has been made in view of the above circumstances, and can easily connect / disconnect the terminal on the equipment side and the terminal on the ground side, and easily ensure waterproofness / dustproofness. An object of the present invention is to provide a connector for measuring ground resistance that can be used.

  In order to solve the above-described problems, a ground resistance measurement connector according to the present invention is a ground resistance measurement connector provided on a ground wire of a device, and the device side to which the ground wire on the device side is connected. A terminal board provided with a terminal and a ground side terminal to which a ground wire on the ground side is connected; and the equipment side terminal and the ground side terminal attached to the terminal board by inserting a terminal of a ground resistance measuring instrument A cover in which a measurement hole for making contact with each other is formed, a connection position for connecting the equipment side terminal and the ground side terminal, and a cutting position for cutting the equipment side terminal and the ground side terminal A connecting member arranged in the cover, a gripping part arranged outside the cover, and a connecting part for connecting the gripping part and the connecting member, Displace the member between the connection position and the cutting position And an operation unit that is operated when causing.

  In the connector for measuring ground resistance, the grip portion may be detachable from the connecting portion.

  In the connector for measuring ground resistance, the connecting portion includes a rotating shaft that is fixed to the connecting member and the gripping portion is detachable, and a bearing that is fixed to the cover and rotatably supports the rotating shaft. You may have.

  In the connector for measuring ground resistance, a sealing member may be attached to the measurement hole, which is opened by inserting a terminal of the ground resistance measuring instrument and closed by extracting the terminal of the ground resistance measuring instrument. .

  According to the present invention, it is possible to easily connect / disconnect the terminal on the equipment side and the terminal on the ground side, and it is not necessary to open and close the cover for the work, so that the waterproof and dustproof property is achieved. Can be easily secured.

It is a figure which shows the utility pole in which the connector for a grounding resistance measurement which concerns on one Embodiment was installed. It is a front view which shows the connector of the state which attached the holding part. It is a front view which shows the connector of the state which removed the holding part. FIG. 4 is a cross-sectional view taken along 4-4 in FIG. 2. FIG. 5 is a sectional view taken along line 5-5 in FIG. 4. It is a sectional side view which shows the connector in the state in which the measurement of ground resistance is performed. It is 7-7 sectional drawing of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a utility pole 1 on which a connector 10 for measuring ground resistance according to an embodiment is installed. As shown in this figure, the connector 10 is fixed to the utility pole 1 with a band 2 and is provided on a grounding wire 5 that connects a transformer 3 installed on the utility pole 1 and a grounding electrode 4 provided underground. It has been.

  FIG. 2 is a front view showing the connector 10 with the grip 44 attached, and FIG. 3 is a front view showing the connector 10 with the grip 44 removed. 4 is a sectional view taken along the line 4-4 in FIG. 2, and FIG. 5 is a sectional view taken along the line 5-5 in FIG. As shown in these drawings, the connector 10 is operated when switching the connection / disconnection of the terminal board 20 for measuring ground resistance, the cover 30 attached to the terminal board 20, and the connector 10. Part 40. On the terminal board 20, a terminal 22A on the transformer 3 side connected to the ground line 5A on the transformer 3 side, a terminal 22B on the ground electrode 4 side connected to the ground line 5B on the ground electrode 4 side, and a terminal A contact plate 24 for electrically connecting / disconnecting between 22A and the terminal 22B is provided.

  The terminals 22A and 22B are provided apart from each other in the vertical direction. Plate nuts 26A and 26B are arranged on the back surfaces of the terminals 22A and 22B, respectively. Further, ground wires 5A and 5B are sandwiched between the terminal 22A and the plate nut 26A, and between the terminal 22B and the plate nut 26B, respectively. The plate nuts 26A and 26B are screwed to the terminals 22A and 22B with a pair of screws 28, respectively. Thereby, the ground line 5A is connected to the terminal 22A, and the ground line 5B is connected to the terminal 22B.

  The contact plate 24 is a rectangular plate material having conductivity such as copper and being elastically deformable, and both longitudinal ends thereof are curved in an arc shape. One end and the other end of the contact plate 24 in the longitudinal direction are in elastic contact with the terminal 22A and the terminal 22B, respectively.

  The cover 30 is a rectangular parallelepiped member that covers the top and the periphery of the terminal board 20. A bearing 32 is embedded in the center in the longitudinal direction, and a rotary shaft 34 is rotatably supported by the bearing 32. Yes. The tip of the rotating shaft 34 is fixed to the central portion in the longitudinal direction of the contact plate 24. A long hole 34 </ b> A is formed at the center of the rotating shaft 34. Here, the bearing 32 is a bearing with a seal excellent in waterproof / dustproof performance, and a gap between the inner and outer is sealed by a lip portion. The rotating shaft 34 is fitted into the inner side of the bearing 32.

  The cover 30 is formed with a pair of ground resistance measurement holes (hereinafter referred to as measurement holes) 36A and 36B. The measurement hole 36A is arranged facing the terminal 22A, and the measurement hole 36B is arranged facing the terminal 22B. Here, a seal member 38 formed of an elastic material such as an annular rubber is attached to the hole walls of the measurement holes 36A and 36B. The seal member 38 closes the measurement holes 36A and 36B and exhibits a waterproof and dustproof function when the probe 6 of the ground resistance measuring instrument is not inserted into the measurement holes 36A and 36B. On the other hand, the seal member 38 is elastically deformed to open the centers of the measurement holes 36A and 36B when the probe 6 is inserted into the measurement holes 36A and 36B.

  The operation unit 40 includes a connecting portion 41 including the bearing 32 and the rotating shaft 34, a shaft 42 that is attached to and detached from the rotating shaft 34, and a gripping portion 44 that is fixed to the shaft 42. A fitting portion 42 </ b> A that fits into the long hole 34 </ b> A of the rotating shaft 34 is formed on one end side of the shaft 42. The fitting portion 42A is formed in a shape having a relationship between the elongated hole 34A and the male and female by forming a D-shaped notch (D cut portion) symmetrically with respect to the center of the rotating shaft 34.

  The grip portion 44 is a rectangular parallelepiped knob whose longitudinal direction is a direction orthogonal to the longitudinal direction of the long hole 34 </ b> A, and the longitudinal direction of the grip portion 44 and the contact plate 24 in a state where the shaft 42 is attached to the rotary shaft 34. Is parallel to the longitudinal direction.

  FIG. 6 is a side sectional view showing the connector 10 in a state where the ground resistance is being measured. FIG. 7 is a sectional view taken along line 7-7 in FIG. As shown in these drawings, when the operator rotates the grip portion 44 in the vertical state by 90 ° around the shaft 42, the contact plate 24 in the vertical state is moved together with the operation unit 40 to the shaft. Rotate 90 ° around 42. As a result, one end and the other end in the longitudinal direction of the contact plate 24 are separated from the terminals 22A and 22B, respectively, and the ground wire 5 is cut between the terminals 22A and 22B.

  Then, the operator inserts the probe 6 of the ground resistance measuring instrument into the measurement holes 36A and 36B and the seal member 38, and the tips thereof are brought into contact with the terminals 22A and 22B. In this state, the transformer 3 and the ground electrode 4 The ground resistance between the two is measured.

  Further, when the measurement of the grounding resistance is completed, the operator pulls out the probe 6 from the measurement holes 36A and 36B and the seal member 38, and rotates the grip portion 44 in the horizontal state around the shaft 42 by 90 °. As a result, the contact plate 24 in the horizontal state rotates 90 ° around the shaft 42 together with the operation unit 40, and one end and the other end in the longitudinal direction of the contact plate 24 contact the terminals 22A and 22B, respectively. The ground wire 5 is connected between the terminal 22A and the terminal 22B.

  Here, when the probe 6 is extracted from the measurement holes 36A and 36B and the seal member 38, the seal member 38 is restored by an elastic force and closes the measurement holes 36A and 36B. Thereby, the sealing member 38 exhibits a waterproof / dustproof function and prevents water and dust from entering the cover 30.

  In addition, the operator ends the measurement of the ground resistance and removes the grip portion 44 from the rotary shaft 34 after returning the ground wire 5 to the connected state. That is, as shown in FIG. 3, the connection device 10 in the connected state is in a state in which the grip portion 44 is not attached. In this state, the contact plate 24 cannot be rotated, and the connection device 10 is in the disconnected state. I can't switch.

  As described above, in the connector 10 according to the present embodiment, the measurement holes 36A and 36B for inserting the probe 6 are formed in the cover 10, and the operation is performed when the contact plate 24 is displaced between the connection position and the cutting position. As the operation unit 40 to be operated, a grip unit 44 connected to the contact plate 24 is provided outside the cover 30. Thus, the device-side terminal 22A and the ground-side terminal 22B can be connected and disconnected without opening and closing the cover 10, and the probe 6 is brought into contact with the terminal 22A and the terminal 22B to connect the ground wire 5 Can be measured.

  Therefore, the device-side terminal 22A and the ground-side terminal 22B can be connected and disconnected without opening and closing the cover 10 or turning a screw. The complexity of the sealing structure can be eliminated. Therefore, the work of connecting / disconnecting the terminal 22A on the equipment side and the terminal 22B on the ground side can be easily performed, and waterproof and dustproof properties can be easily secured.

  Further, in the connector 10 according to the present embodiment, the grip portion 40 can be attached to and detached from the rotating shaft 34 fixed to the contact plate 24. Thereby, except when measuring a grounding resistance, it can be made the state in which the holding part 44 is not mounted | worn with the connector 10, and it can prevent that the connector 10 is switched to a disconnection state.

  Further, in the connector 10 according to the present embodiment, the connecting portion 41 that connects the contact plate 24 and the grip portion 44 is connected to the rotary shaft 34 that is fixed to the contact plate 24 and to which the grip portion 44 is detachable, and the cover 30. The bearing 32 is fixed and rotatably supports the rotation shaft 34. Further, the bearing 32 is a sealed bearing excellent in waterproof and dustproof performance. Thereby, the waterproof and dustproof property in the connection part 41 is securable.

  Further, in the connector 10 according to the present embodiment, the sealing member 38 that is opened by inserting the probe 6 and is closed by extracting the probe 6 is attached to the measurement holes 36A and 36B. Thereby, the waterproof and dustproof property in the measurement holes 36A and 36B can be secured.

  As mentioned above, although the form for implementing this invention was demonstrated, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention. For example, in the above embodiment, the switch for switching connection / disconnection of the connector 10 is a rotary type (rotary type), but it may be a slide type.

  Moreover, in the said embodiment, although the sealing member 38 was attached to the measurement holes 36A and 36B, you may waterproof and dust-proof, for example by attaching a removable cap member. Moreover, in the said embodiment, it comprised so that the both ends of the contact plate 24 may be contact | abutted to terminal 22A, 22B with an own elastic force. However, when a member having a wedge structure facing the terminals 22A and 22B via both ends of the contact plate 24 is provided and the contact plate 24 is displaced to the connection position, both ends of the contact plate 24 are moved by the action of the wedge structure of the member. You may comprise so that it may contact terminal 22A, 22B.

1 Telephone pole, 2 bands, 3 transformer, 4 grounding pole, 5, 5A, 5B grounding wire, 6 probe (terminal of grounding resistance measuring device), 10 connector for grounding resistance measurement, 20 terminal board, 22A terminal (equipment) Side terminal), 22B terminal (ground side terminal), 24 contact plate (connection member), 26A, 26B plate nut, 28 screw, 30 cover, 32 bearing, 34 rotating shaft 34A long hole, 36A, 36B measurement hole, 38 seal Member, 40 operation unit, 41 connecting unit, 42 shaft, 44 gripping unit

Claims (4)

A connector for measuring a ground resistance provided on a ground wire of a device,
A terminal board provided with a device-side terminal to which a device-side ground wire is connected, and a ground-side terminal to which a ground-side ground wire is connected;
A cover that is attached to the terminal board and has a measurement hole for inserting a terminal of a ground resistance measuring instrument to contact the device side terminal and the ground side terminal, and
A connecting member disposed in the cover so as to be displaceable between a connection position for connecting the equipment side terminal and the ground side terminal and a cutting position for cutting the equipment side terminal and the ground side terminal. When,
A grip portion disposed outside the cover; and a coupling portion that couples the grip portion and the connection member, and is operated when the connection member is displaced between the connection position and the cutting position. An operation unit to be operated;
A connector for measuring ground resistance.   The grounding resistance measuring connector according to claim 1, wherein the gripping part is detachable from the connecting part.   The grounding resistance measurement according to claim 2, wherein the connecting portion includes a rotating shaft fixed to the connecting member and to which the gripping portion is detachable, and a bearing fixed to the cover and rotatably supporting the rotating shaft. Connector.   4. The seal member according to claim 1, wherein a seal member that is opened by inserting a terminal of the ground resistance measuring instrument and is closed by extracting the terminal of the ground resistance measuring instrument is attached to the measurement hole. A connector for measuring ground resistance as described in the paragraph.

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