Connection device

Abstract

To realize a connecting device that can suitably connect a replacement measuring instrument to a check terminal. [Solution] With this connecting device 100, when connecting the tips of multiple plugs 10 (first plug 11, second plug 12) to multiple replacement terminals 50 (terminal body 51) of the check terminal 90, the expandable voltage-side first plug 11 can be brought into contact with the replacement terminal 50 before the current-side second plug 12, and the second plug 12 can be brought into contact with the replacement terminal 50 while the first plug 11 is contracted. In this way, the first plug 11, to which the voltage-side lead wire 1a of the replacement meter 1 is electrically connected, can be connected to the replacement terminal 50 before the second plug 12, to which the current-side lead wire 1a of the replacement meter 1 is electrically connected. This makes it possible to set the date and time of the replacement meter 1 and record its reading before the replacement meter 1 starts its metering operation.

Description

Technical Field

[0001] The present invention relates to a connecting device, and particularly to a connecting device for connecting a replacement meter to a check terminal.

Background Art

[0002] In high-voltage power receiving equipment, a high-voltage meter for measuring the amount of electric power is installed. The high-voltage meter is installed, for example, in a cubicle-type high-voltage power receiving equipment (hereinafter referred to as a cubicle). A check terminal is installed in the cubicle, and a high-voltage meter and a transformer are connected to the check terminal.

[0003] The high-voltage meter is obliged to be replaced every predetermined period according to the measurement law. When replacing the high-voltage meter, the old high-voltage meter is replaced with a new voltage meter while temporarily attaching a replacement meter to the check terminal. By doing so, it is possible to avoid a non-measurement state during the replacement work and a power outage of the consumer who has the high-voltage meter installed. The replacement meter is provided with a total of seven lead wires including, for example, four current wires and three voltage wires. The work of attaching these seven lead wires one by one to a predetermined attachment location of the check terminal is complicated and may take time.

[0004] In order to simplify the attachment work of the replacement meter that was so complicated, the applicant of the present application developed a connecting device in which terminal portions connected to the seven lead wires were arranged corresponding to the attachment locations of the check terminal, and by attaching the connecting device to the check terminal, a technique for collectively connecting the seven lead wires to the attachment locations of the check terminal was previously proposed (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2009-175002 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, in the case of the connection device described in Patent Document 1, the current and voltage lines of the replacement meter are connected together to the mounting location of the check terminal, which presents a problem in that the reading at the time the replacement meter is installed may become unknown.

[0007] The object of the present invention is to provide a connecting device that can suitably connect an alternative measuring instrument to a check terminal. [Means for solving the problem]

[0008] To solve the above problems, the invention described in claim 1 is: A connecting device for connecting a replacement measuring instrument having multiple lead wires, including voltage-side lead wires and current-side lead wires, to a check terminal having multiple terminals, including voltage-side terminals and current-side terminals, arranged in a predetermined order, The connecting device comprises multiple plugs to which the multiple lead wires of the alternative measuring instrument are connected at their base ends. The plurality of plugs are arranged in a sequence such that the plurality of lead wires of the alternative measuring instrument connected to the plurality of plugs correspond to the plurality of terminals of the check terminal, and the plurality of plugs are arranged in a position such that the plurality of plugs can face the plurality of terminals. In order to connect the multiple lead wires of the alternative measuring instrument to the multiple terminals of the check terminal via the multiple plugs of the connecting device, the tip of the multiple plugs is configured such that, when connecting the tip of the multiple plugs to the multiple terminals, the first plug to which the voltage-side lead wire is connected makes contact with the terminal before the second plug to which the current-side lead wire is connected.

[0009] The invention described in claim 2 is a connecting device described in claim 1, The first plug is retractable and is formed to be longer than the second plug. The connection device is characterized in that, when connecting the plurality of plugs of the connection device to the plurality of terminals of the check terminal, the second plug contacts the terminal while the first plug is in a contracted state and in contact with the terminal.

[0010] The invention described in claim 3 is a connecting device described in claim 2, The first plug comprises a shaft portion and a cylindrical portion that houses the shaft portion so as to be able to move back and forth. The first plug is characterized in that, when the shaft portion that has contacted the terminal is retracted into the cylindrical portion and the first plug is contracted, it is configured to be approximately the same length as the second plug.

[0011] The invention described in claim 4 relates to a connecting device described in any one of claims 1 to 3, The multiple terminals of the check terminal are attached to multiple terminal boards arranged at predetermined intervals. The connecting device is equipped with multiple insulating guide portions that can be inserted between the multiple terminal boards. The present invention is characterized in that the plurality of plugs are configured to face the plurality of terminals when the plurality of guide portions are inserted between the plurality of terminal plates. [Effects of the Invention]

[0012] According to the present invention, a connecting device is obtained that can suitably connect an alternative measuring instrument to a check terminal. [Brief explanation of the drawing]

[0013] [Figure 1] This is an explanatory diagram showing the configuration of a replacement measuring instrument to which the connecting device of this embodiment is attached, and a check terminal. [Figure 2]Front view (a) showing the check terminal, cross-sectional view (b) taken along line B-B in Fig. 2(a), and cross-sectional view (c) taken along line C-C in Fig. 2(a). [Figure 3] Front view (a) showing the connecting device of this embodiment, side view (b) from the arrow B side in Fig. 3(a), and side view (c) from the arrow C side in Fig. 3(a). [Figure 4] Explanatory diagram showing the internal structure of the connecting device of this embodiment. [Figure 5] Cross-sectional view (a) in the state where the first plug of the connecting device is extended, cross-sectional view (b) in the state where the first plug is contracted, and cross-sectional view (c) of the second plug of the connecting device. [Figure 6] Explanatory diagram (front view) regarding the procedure of attaching the connecting device of this embodiment to the check terminal and connecting the alternative measuring instrument to the check terminal. [Figure 7] Explanatory diagram (schematic cross-sectional view) regarding the procedure of attaching the connecting device of this embodiment to the check terminal and connecting the alternative measuring instrument to the check terminal. [Figure 8] Explanatory diagram (front view) regarding the procedure of attaching the connecting device of this embodiment to the check terminal and connecting the alternative measuring instrument to the check terminal. [Figure 9] Explanatory diagram (schematic cross-sectional view) regarding the procedure of attaching the connecting device of this embodiment to the check terminal and connecting the alternative measuring instrument to the check terminal. [Figure 10] Explanatory diagram (front view) regarding the procedure of attaching the connecting device of this embodiment to the check terminal and connecting the alternative measuring instrument to the check terminal. [Figure 11] Explanatory diagram (schematic cross-sectional view) regarding the procedure of attaching the connecting device of this embodiment to the check terminal and connecting the alternative measuring instrument to the check terminal. [Figure 12] Explanatory diagram (front view) of the procedure when replacing the high-pressure measuring instrument after attaching the connecting device of this embodiment to the check terminal and connecting the alternative measuring instrument to the check terminal. [Modes for carrying out the invention]

[0014] Hereinafter, embodiments of the connecting device according to the present invention will be described in detail with reference to the drawings. However, the embodiments described below are subject to various technically preferred limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

[0015] Figure 1 is an explanatory diagram showing the connection device 100 according to the present invention and the check terminal 90 to which the connection device 100 is to be attached. A replacement measuring device 1 is connected to the connecting device 100. The check terminal 90 is connected between the transformer 2 and the high-voltage meter 3.

[0016] The connecting device 100 according to the present invention is used to connect a replacement meter 1 to a check terminal 90 when replacing a high-voltage meter 3. This connection device 100 is equipped with multiple plugs 10 that correspond to multiple terminals 50 (replacement terminals 50 described later) provided on the check terminal 90, and has the function of electrically connecting the replacement measuring instrument 1 connected to the connection device 100 to the check terminal 90 by connecting the multiple plugs 10 to the multiple terminals 50.

[0017] First, let's explain the configuration of Check Terminal 90. The check terminal 90 includes, for example, a terminal section 80 to which the transformer 2 and the high-voltage meter 3 are connected, a circuit board 70 on which the terminal section 80 is mounted, and an outer casing 60 for housing the circuit board 70 on which the terminal section 80 is mounted.

[0018] The outer box 60 is, for example, a molded body made of ABS resin, and has a flat plate portion that is roughly rectangular in shape and a frame portion in which the periphery of the flat plate portion is erected. The substrate 70 is a rectangular flat plate made of resin material and is used as a mounting base for the terminal portion 80.

[0019] The terminal section 80 comprises a plurality of terminal boards 88 mounted on the substrate 70, and includes a transformer terminal section 81 provided on one end (left side) of the terminal board 88, a metering terminal section 82 provided on the other end (right side) of the terminal board 88, and a connector 83 provided in the center of the terminal board 88.

[0020] The terminal board 88 is an elongated plate-shaped member made of metal material, and its lower surface is attached to the substrate 70 via a connecting member (not shown). In this embodiment, seven terminal boards 88 are used, and the seven terminal boards 88 are arranged on the substrate 70 at predetermined intervals. The seven terminal boards 88 here consist of three voltage-side terminal boards 88 and four current-side terminal boards 88. Specifically, in Figures 2(a) and 2(b), terminal boards 88 corresponding to "1S" on the current side, terminal board 88 corresponding to "P1" on the voltage side, terminal board 88 corresponding to "P3" on the voltage side, terminal board 88 corresponding to "3S" on the current side, terminal board 88 corresponding to "3L" on the current side, terminal board 88 corresponding to "P2" on the voltage side, and terminal board 88 corresponding to "1L" on the current side are arranged at predetermined intervals from top to bottom. As will be described later, the voltage-side terminal board 88 is connected to the voltage-side lead wires (2a, 3a) of the transformer 2 and the high-voltage meter 3, and the current-side terminal board 88 is connected to the current-side lead wires (2a, 3a) of the transformer 2 and the high-voltage meter 3.

[0021] The transformer terminal section 81 has two screws N screwed into the upper surface of one end (left side) of the terminal plate 88. As shown in Figures 2(b) and 2(c), an insertion hole 81a is provided on one end face (left end face) of the terminal plate 88 for inserting the tip of the lead wire 2a connected to the transformer 2. The tip of the lead wire 2a inserted into the insertion hole 81a is tightened and fixed by a screw N. In this way, the transformer terminal section 81 and the lead wire 2a of the transformer 2 are electrically connected. The seven lead wires 2a of the transformer 2 include three voltage-side lead wires 2a and four current-side lead wires 2a. The voltage-side lead wires 2a are connected to terminal boards 88 (transformer terminal section 81) corresponding to the voltage side, and the current-side lead wires 2a are connected to terminal boards 88 (transformer terminal section 81) corresponding to the current side.

[0022] Furthermore, the transformer terminal section 81 is provided with an alternative terminal 50 for connecting the alternative measuring device 1. The replacement terminal 50 is made of a conductive material and has a terminal body 51 erected on the upper surface of the terminal board 88, and a fixing screw 52 made of an insulating material and screwed into the upper part of the terminal body 51. The terminal body 51 is provided with an insertion hole 51a for inserting lead wires or plugs, and the tip of the lead wire or plug inserted into the insertion hole 51a is tightened by a fixing screw 52 to fix it to the terminal body 51. In this embodiment, as shown in Figures 2(a) and 2(b), the following terminals are provided in order from top to bottom: a current-side replacement terminal 50 corresponding to "1S", a voltage-side replacement terminal 50 corresponding to "P1", a voltage-side replacement terminal 50 corresponding to "P3", a current-side replacement terminal 50 corresponding to "3S", a current-side replacement terminal 50 corresponding to "3L", a voltage-side replacement terminal 50 corresponding to "P2", and a current-side replacement terminal 50 corresponding to "1L". Thus, the check terminal 90 has multiple (seven) alternative terminals 50 arranged in a predetermined order, including alternative terminals 50 on the voltage side (P1, P3, P2) and alternative terminals 50 on the current side (1S, 3S, 3L, 1L).

[0023] The terminal section 82 for the measuring instrument has two screws N screwed into the upper surface of the other end (right side) of the terminal plate 88. As shown in Figure 2(c), an insertion hole 82a is provided on the other end face (right end face) of the terminal board 88 for inserting the tip of the lead wire 3a of the high-voltage meter 3. The tip of the lead wire 3a inserted into the insertion hole 82a is tightened and fixed by a screw N. In this way, the terminal section 82 for the meter and the lead wire 3a of the high-voltage meter 3 are electrically connected. The high-voltage meter 3 has seven lead wires 3a, which include three voltage-side lead wires 3a and four current-side lead wires 3a. The voltage-side lead wires 3a are connected to terminal boards 88 (meter terminal section 82) that correspond to the voltage side, and the current-side lead wires 3a are connected to terminal boards 88 (meter terminal section 82) that correspond to the current side. Furthermore, the terminal section 82 for the measuring instrument is provided with a test terminal 55 having the same structure as the replacement terminal 50 described above.

[0024] The connector 83 is a component for switching between conductivity and non-conductivity between the transformer 2 and the high-voltage meter 3, and consists of a handle portion 83a made of insulating material and a main body portion 83b made of conductive material. The terminal board 88 described above is divided in the center at a predetermined interval, and the connector 83 is detachably fitted into this divided gap. By fitting the main body 83b of the connector 83 into the gap of the terminal board 88, one end of the terminal board 88 (transformer terminal section 81 side) and the other end (metering terminal section 82 side) are electrically connected via the connector 83. When replacing the high-voltage meter 3, the connector 83 is pulled out, which insulates one end (transformer side) and the other end (meter side) of the terminal board 88.

[0025] Next, the connecting device 100 of this embodiment will be described. The connecting device 100 in this embodiment is a device for connecting the replacement measuring device 1 to the check terminal 90 described above. Specifically, this connecting device 100 is used to connect a replacement meter 1, which has multiple lead wires 1a including voltage-side lead wires and current-side lead wires, to a check terminal 90 in which multiple replacement terminals 50, including voltage-side replacement terminals 50 (P1, P3, P2) and current-side replacement terminals 50 (1S, 3S, 3L, 1L), are arranged in a predetermined order.

[0026] The connecting device 100 includes, for example, multiple plugs 10 to which the multiple lead wires 1a of the replacement measuring instrument 1 are electrically connected, as shown in Figures 3(a), (b), (c) and 4. As will be described later, the connecting device 100 includes a first plug 11 to which the voltage-side lead wire 1a is electrically connected, and a second plug 12 to which the current-side lead wire 1a is electrically connected.

[0027] As shown in Figures 3(a), 3(b), 3(c), and 4, the connecting device 100 of this embodiment includes, for example, a terminal block 21 on which a plurality of lead wire fixing parts 20 are arranged in parallel, a plurality of conductor bars 30 having a substantially L-shape and one end connected to the lead wire fixing part 20 of the terminal block 21, a plurality of plug fixing parts 40 arranged on the other end of the conductor bars 30, a case body 101 having an internal space for housing the base ends of a plurality of plugs 10 fixed to the plurality of plug fixing parts 40, and a top cover 102 for closing the internal space of the case body 101. The case body 101 and the top cover 102 are made of insulating material, and the top cover 102 is fixed to the case body 101 with screws. The tips of the multiple plugs 10 protrude outward from the case body 101. The conductor bar 30, which has a roughly L-shape, is formed by connecting two conductor bars of different lengths at roughly right angles to each other, and electrically connects the lead wire fixing part 20 and the plug fixing part 40. Alternatively, the lead wire fixing part 20 and the plug fixing part 40 may be electrically connected with a single conductor bar 30.

[0028] Furthermore, as shown in Figure 3(b), eight guide portions 103 made of insulating material are provided on the lower surface of the case body 101. Insulating rubber 103a is attached to the seven grooves between the guide sections 103. This guide section 103 has a thickness that allows it to be inserted between the terminal boards 88 of the aforementioned check terminal 90 (see Figure 2(b)). Furthermore, by aligning the seven grooves between the guide sections 103 with the seven terminal boards 88, it is possible to install the connecting device 100 on the check terminal 90 so that the eight guide sections 103 span across the seven terminal boards 88. Furthermore, with the connecting device 100 installed on the check terminal 90 so that these guide portions 103 are inserted between the terminal boards 88, the multiple plugs 10, which will be described later, are configured to face the alternative terminals 50 (terminal body 51) of the check terminal 90.

[0029] As shown in Figure 4, the case body 101 has a roughly rectangular shape when viewed from the front. The terminal block 21, on which multiple lead wire fixing parts 20 are arranged side by side, is located on the short side of the case body 101, while the multiple plug fixing parts 40 are arranged side by side on the long side of the case body 101. In this embodiment, seven lead wire fixing parts 20 are arranged in parallel on the terminal block 21. In Figure 4, from left to right, the lead wire fixing part 20 is associated with "1S" on the current side, the lead wire fixing part 20 is associated with "P1" on the voltage side, the lead wire fixing part 20 is associated with "P3" on the voltage side, the lead wire fixing part 20 is associated with "3S" on the current side, the lead wire fixing part 20 is associated with "3L" on the current side, the lead wire fixing part 20 is associated with "P2" on the voltage side, and the lead wire fixing part 20 is associated with "1L" on the current side. In this embodiment, seven plug fixing parts 40 are arranged in parallel. In Figure 4, from top to bottom, there is a current-side lead wire fixing part 20 corresponding to "1S", a voltage-side lead wire fixing part 20 corresponding to "P1", a voltage-side lead wire fixing part 20 corresponding to "P3", a current-side lead wire fixing part 20 corresponding to "3S", a current-side lead wire fixing part 20 corresponding to "3L", a voltage-side lead wire fixing part 20 corresponding to "P2", and a current-side lead wire fixing part 20 corresponding to "1L". As shown in Figure 3(a), the top surface of the top cover 102 is marked with "1S", "P1", "P3", "3S", "3L", "P2", and "1L", corresponding to the seven lead wire fixing parts 20 and the seven plug fixing parts 40.

[0030] The seven lead wires 1a of the replacement measuring device 1 are connected to the seven lead wire fixing sections 20 of the terminal block 21. The seven lead wires 1a of the replacement measuring instrument 1 include three voltage-side lead wires 1a (P1, P3, P2) and four current-side lead wires 1a (1S, 3S, 3L, 1L). Each voltage-side lead wire 1a is connected to a lead wire fixing part 20 corresponding to the voltage side, and each current-side lead wire 1a is connected to a lead wire fixing part 20 corresponding to the current side. The lead wire fixing section 20 is equipped with a connecting screw and a washer, and the tip of the lead wire 1a is sandwiched between the conductor bar 30 and the washer, and the lead wire 1a is fixed between the conductor bar 30 and the washer by tightening the connecting screw. Furthermore, the case body 101 is provided with an opening 101a for passing the lead wires 1a through the internal space.

[0031] A plug 10 is connected to each of the seven plug fixing parts 40. The plug fixing part 40 is equipped with a connecting screw and a washer, and the base end of the plug 10 is sandwiched between the conductor bar 30 and the washer, and the plug 10 is fixed between the conductor bar 30 and the washer by tightening the connecting screw. The connecting device 100 of this embodiment includes a first plug 11 that is electrically connected to the voltage-side (P1, P3, P2) lead wires 1a and a second plug 12 that is electrically connected to the current-side (1S, 3S, 3L, 1L) lead wires 1a, with the first plug 11 connected to a plug fixing part 40 corresponding to the voltage side and the second plug 12 connected to a plug fixing part 40 corresponding to the current side. Yes, they are. This connector 100 has seven plugs 10, including three first plugs 11 and four second plugs 12, with the first plugs 11 being longer than the second plugs 12. The case body 101 is provided with through holes (not shown) for inserting the plugs 10 (first plug 11, second plug 12) into the internal space.

[0032] In this configuration, a first plug 11 and a second plug 12 are connected to each of the seven plug fixing parts 40, and the seven lead wires 1a of the replacement measuring device 1 are connected to each of the seven lead wire fixing parts 20. The first plug 11 and the second plug 12 are electrically connected to the lead wires 1a of the replacement measuring device 1 via the conductor bar 30, with the first plug 11 electrically connected to the voltage-side lead wire 1a and the second plug 12 electrically connected to the current-side lead wire 1a. The first plug 11 and the second plug 12 of the connecting device 100 are arranged in a way that allows the lead wires 1a of the alternative measuring instrument 1, which are electrically connected to these plugs, to correspond to the seven alternative terminals 50 of the check terminal 90, and the first plug 11 and the second plug 12 are positioned side by side so that they can face the seven alternative terminals 50.

[0033] As shown in Figures 3(a) and 4, the plug 10 (first plug 11, second plug 12) has a shaft portion 13 for contacting and connecting to the replacement terminal 50 (terminal body 51) of the aforementioned check terminal 90, and a cylindrical portion 14 that holds the shaft portion 13. The shaft portion 13 is a component made of metal material and is the tip of the plug 10 that is inserted into the insertion hole 51a of the terminal body 51 of the replacement terminal 50 mentioned above. The cylindrical portion 14 has a cylindrical body 14a made of a metal material and an insulating cover 14b made of an insulating material that covers the circumferential surface of the cylindrical body 14a (see Figure 5). The shaft portion 13 is housed inside the cylindrical body 14a of the cylindrical portion 14, in a state of being in contact with it. Furthermore, a base end made of metal is provided on the rear end side of the cylindrical body 14a, and this base end is connected to the plug fixing part 40.

[0034] Furthermore, as shown in Figures 5(a), (b), and (c), the first plug 11, which is longer than the second plug 12, is formed to be retractable. Specifically, the first plug 11 comprises a shaft portion 13, a cylindrical portion 14 that houses the shaft portion 13 so as to be able to move back and forth, and a spring member 15 interposed between the shaft portion 13 and the cylindrical portion 14. The first plug 11 expands and contracts in accordance with the elastic deformation of the spring member 15. The first plug 11 is longest when the spring member 15 is extended and the shaft portion 13 protrudes from the cylindrical portion 14 (Figure 5(a)), and shortest when the spring member 15 is contracted and the shaft portion 13 is retracted into the cylindrical portion 14 (Figure 5(b)). Furthermore, the second plug 12 does not have an extension or retraction function, and the shaft portion 13 of the second plug 12 is fixed to the cylindrical portion 14 (Figure 5(c)). Then, as shown in Figures 5(b) and 5(c), when the shaft portion 13 of the first plug 11 is retracted into the cylindrical portion 14 and the first plug 11 is contracted, it becomes approximately the same length as the second plug 12.

[0035] Next, the procedure for attaching the connecting device 100 of this embodiment to the check terminal 90 and connecting the replacement measuring instrument 1 to the check terminal 90 will be described.

[0036] First, as shown in Figures 6 and 7, the connecting device 100 to which the lead wire 1a of the replacement measuring instrument 1 is connected is placed to the left of the check terminal 90, and the first plug 11 and the second plug 12 of the connecting device 100 are directed toward the terminal body 51 of the replacement terminal 50, respectively. At this time, as shown in Figure 6, seven replacement terminals 50 (terminal body 51) are assigned from top to bottom to "1S", "P1", "P3", "3S", "3L", "P2", and "1L", and are facing each other with a second plug 12 assigned to "1S", a first plug 11 assigned to "P1", a first plug 11 assigned to "P3", a second plug 12 assigned to "3S", a second plug 12 assigned to "3L", a first plug 11 assigned to "P2", and a second plug 12 assigned to "1L".

[0037] Next, as shown in Figures 8 and 9, the connecting device 100 is slid to the right in the diagram toward the transformer terminal portion 81 of the check terminal 90, bringing the connecting device 100 closer to the replacement terminal 50, and the tip of the first plug 11 of the connecting device 100 is inserted into the insertion hole 51a of the terminal body 51. At that time, by sliding the guide portion 103 of the connecting device 100 along the terminal plate 88 so that it is inserted between the terminal plates 88 of the check terminal 90, it becomes easier to insert the tip of the first plug 11 into the insertion hole 51a of the terminal body 51. Then, after inserting the tip of the first plug 11 into the insertion hole 51a of the terminal body 51, the fixing screw 52 is tightened to fix the tip (shaft portion 13) of the first plug 11 to the terminal body 51. At this time, the first plug 11, which corresponds to the voltage side "P1", "P3", and "P2", is fixed to the replacement terminal 50 (terminal body 51) which corresponds to the voltage side "P1", "P3", and "P2", and the voltage side lead wire 1a of the replacement meter 1 corresponding to the first plug 11 is electrically connected to the replacement terminal 50 (terminal body 51) of the check terminal 90. In this state, operate the substitute weighing device 1 to set the date and time of substitute weighing device 1 and to check the indicated quantity. The indicated quantity should be recorded in a form or by taking a photograph.

[0038] Next, as shown in Figures 10 and 11, the connector 100 is slid to bring it even closer to the replacement terminal 50, and the tip of the second plug 12 of the connector 100 is inserted into the insertion hole 51a of the terminal body 51. When the tip of the second plug 12 is inserted into the insertion hole 51a of the terminal body 51, the tip of the first plug 11 (shaft portion 13) is fixed to the terminal body 51 by a fixing screw 52. As the connecting device 100 approaches the replacement terminal 50, the shaft portion 13 of the first plug 11 retracts into the cylindrical portion 14, causing the first plug 11 to contract. In other words, the second plug 12 comes into contact with the replacement terminal 50 (terminal body 51) when the first plug 11 is in contact with the replacement terminal 50 (terminal body 51) and has contracted. Similarly, in this case as well, the guide portion 103 of the connecting device 100 is slid along the terminal plate 88 of the check terminal 90. Then, after inserting the tip of the second plug 12 into the insertion hole 51a of the terminal body 51, the fixing screw 52 is tightened to secure the tip of the second plug 12 to the terminal body 51. In this way, the second plug 12, which corresponds to "1S", "3S", "3L", and "1L" on the current side, is fixed to the replacement terminal 50 (terminal body 51), which corresponds to "1S", "3S", "3L", and "1L" on the current side, and all the lead wires 1a of the replacement meter 1 are electrically connected to the replacement terminal 50 (terminal body 51) of the check terminal 90. In this state, the weighing operation of the substitute weighing device 1 begins.

[0039] In this way, the first plug 11 and the second plug 12 of the connecting device 100 can be fixed to the replacement terminal 50 (terminal body 51) of the check terminal 90, and the lead wire 1a of the replacement measuring instrument 1 can be connected to the replacement terminal 50 (terminal body 51) of the check terminal 90 via the first plug 11 and the second plug 12 of the connecting device 100.

[0040] After attaching the connecting device 100 to the check terminal 90 and connecting the replacement measuring instrument 1 to the check terminal 90, the connector 83 of the check terminal 90 is pulled out to insulate the transformer terminal section 81 side from the measuring instrument terminal section 82 side, as shown in Figure 12. With the transformer terminal section 81 and the meter terminal section 82 insulated, the high-voltage meter 3 connected to the meter terminal section 82 is removed and replaced with a new high-voltage meter 3. Here, one end of the lead wire 3a is connected to the high-voltage meter 3, and the other end is connected to the check terminal 90 (terminal board 88 of the meter terminal section 82). Therefore, when replacing the high-voltage meter 3, one end of the lead wire 3a is disconnected from the old high-voltage meter 3 and connected to the new high-voltage meter 3. After replacing the high-voltage meter 3, insert the connector 83 into the gap of the terminal board 88, and remove the connector 100 from the check terminal 90 in the reverse order of installation, thereby completing the replacement of the high-voltage meter 3.

[0041] When removing the connector 100, the second plug 12 on the current side is pulled out from the replacement terminal 50 (terminal body 51) on the current side (1S, 3S, 3L, 1L), and the first plug 11 on the voltage side is connected to the replacement terminal 50 (terminal body 51) on the voltage side (P1, P3, P2). The final number of readings for this replacement work is recorded in a form or by taking a photograph. Then, after recording the number of readings, the first plug 11 on the voltage side is pulled out from the alternative terminals 50 (terminal body 51) on the voltage side (P1, P3, P2), and the connecting device 100 is removed from the check terminal 90.

[0042] As described above, with the connecting device 100 of this embodiment, when connecting the tips of multiple plugs 10 (three first plugs 11 and four second plugs 12) to multiple replacement terminals 50 (terminal body 51) of the check terminal 90, the first plugs 11, which correspond to the voltage side "P1", "P3", and "P2", contact the replacement terminals 50 (terminal body 51) before the second plugs 12, which correspond to the current side "1S", "3S", "3L", and "1L". This allows the first plugs 11, to which the voltage side lead wires 1a of the replacement meter 1 are electrically connected, to be connected and fixed to the replacement terminals 50 (terminal body 51) before the second plugs 12, to which the current side lead wires 1a of the replacement meter 1 are electrically connected.

[0043] Thus, in this embodiment, the connection device 100 allows the first plug 11, to which the voltage-side lead wire 1a of the replacement meter 1 is electrically connected, to be connected to the replacement terminal 50 (terminal body 51) before the second plug 12, to which the current-side lead wire 1a of the replacement meter 1 is electrically connected. Therefore, it becomes possible to set the date and time of the replacement meter 1 and record its reading before the replacement meter 1 starts its metering operation. With such a connecting device 100, the reading will not become unknown when connecting the replacement meter 1 to the check terminal 90, the replacement meter 1 can be appropriately connected to the check terminal 90, and the high-voltage meter 3 can be replaced.

[0044] The application of the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention. [Explanation of Symbols]

[0045] 1 Alternative measuring device 1a Lead wire 2 Transformers 2a Lead wire 3. High-voltage measuring instrument 3a Lead wire 10 plugs 11. First plug 12. Second plug 13. Shaft 14 Cylinder part 15 Spring component 20 Lead wire fixing part 30 Conductor Bars 40 Plug fixing part 50 Alternative terminal 51 Terminal body 51a Insertion hole 52 Fixing screws 80 Terminal section 81 Transformer terminal section 82 Terminal section for measuring instrument 83 Connectors 83a Handle section 83b Main body 88 Terminal board 90 Check Terminal 100 connection devices 101 Case Body 102 Top lid 103 Guide Section

Claims

1. A connecting device for connecting a replacement measuring instrument having multiple lead wires, including voltage-side lead wires and current-side lead wires, to a check terminal having multiple terminals, including voltage-side terminals and current-side terminals, arranged in a predetermined order, The connecting device comprises multiple plugs to which the multiple lead wires of the alternative measuring instrument are connected at their base ends. The plurality of plugs are arranged in a sequence such that the plurality of lead wires of the alternative measuring instrument connected to the plurality of plugs correspond to the plurality of terminals of the check terminal, and the plurality of plugs are arranged in a position such that the plurality of plugs can face the plurality of terminals. A connecting device characterized in that, in order to connect the multiple lead wires of the alternative measuring instrument to the multiple terminals of the check terminal via the multiple plugs of the connecting device, when connecting the tip sides of the multiple plugs to the multiple terminals, the first plug to which the voltage-side lead wire is connected makes contact with the terminal before the second plug to which the current-side lead wire is connected.

2. The first plug is retractable and is formed to be longer than the second plug. The connecting device according to claim 1, characterized in that when connecting the plurality of plugs of the connecting device to the plurality of terminals of the check terminal, the second plug contacts the terminal while the first plug is in a contracted state in contact with the terminal.

3. The first plug comprises a shaft portion and a cylindrical portion that houses the shaft portion so as to be able to move back and forth. The connecting device according to claim 2, characterized in that the shaft portion that has contacted the terminal is retracted into the cylindrical portion and the first plug is contracted so that it is approximately the same length as the second plug.

4. The multiple terminals of the check terminal are attached to multiple terminal boards arranged at predetermined intervals. The connecting device is equipped with multiple insulating guide portions that can be inserted between the multiple terminal boards. The connecting device according to any one of claims 1 to 3, characterized in that the plurality of plugs are configured to face the plurality of terminals when the plurality of guide portions are inserted between the plurality of terminal plates.

Images