JP2015155809A - Watthour meter automatic wire connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a watthour meter automatic wire connection device which allows testing of watthour meters each having different rating current and a different manufacturer specification from each other, minimizes scratches on terminals of the watthour meter, does not generate excessive heating during testing, and further excels in maintainability.

SOLUTION: To provide a watthour meter automatic wire connection device comprises: an indicator insertion port through which a box type watthour meter is inserted from a back side; an indicator support part supporting the box type watthour meter inserted into the indicator insertion port; a plurality of current terminal contact members connected to an external testing device; a contact member biasing mechanism for bringing the plurality of current terminal contact members into contact with a plurality of current terminals by application of biasing force. The current terminal contact member has a groove including a pair of line-symmetrical inclined planes, each of which is in contact with an edge of a lateral face other than the lateral face of the current terminal having the largest area.

COPYRIGHT: (C)2015,JPO&INPIT

Description

  The present invention relates to an automatic connection device for performing a performance test of a watt-hour meter.

  Conventional mechanical watt-hour meters and electronic watt-hour meters (hereinafter sometimes referred to as conventional watt-hour meters) have a shape in which a terminal block for connecting with electric wires is integrated with the watt-hour meter body. It was. When performing an electrical performance test on a conventional watt-hour meter, the automatic wire-connector for connecting and connecting to the power supply unit of the test device uses a terminal block to press the device wire-connector from the front or from the bottom. The connection between the power supply unit of the test apparatus and the watt hour meter has been performed by inserting and connecting.

Nowadays, the conventional watt hour meter is scheduled to be replaced with a watt hour meter defined as a smart meter. The smart meter has a function to measure and hold the amount of power every 30 minutes, and communicates with the outside, so that automatic meter reading and HEMS (HEMS: Home Energy Management System). This is a system that supports energy management in homes, such as connecting energy consuming equipment in a home via a network, enabling monitoring of operating status and energy consumption status, remote control and automatic control, etc.) It is a watt-hour meter that handles information. For this reason, in addition to the basic metering function test, the smart meter is particularly important for the function test related to the communication unit, such as performance check related to the communication function, confirmation of retained data, and setting of various conditions for the watt-hour meter.
Some smart meters have a shape in which terminal blocks are separated, and others have a shape in which a weighing function and a communication function are configured as boxes. Any of the shapes is a terminal block separation type watt hour meter (hereinafter sometimes referred to as a box type watt hour meter).

  As shown in FIG. 1, in the box-type watt-hour meter 100, a current terminal 102 made of a metal plate and a voltage terminal 103 made of a metal plate protrude from the back surface of the watt-hour meter main body 101 in a parallel positional relationship. . Since the box-type watt-hour meter is different from the conventional-type watt-hour meter in the position of the terminal at the time of testing, the conventional watt-hour meter connector cannot be used for the box-type watt-hour meter.

Several patent applications have been filed for a single connector corresponding to a box-type watt-hour meter.
For example, Patent Document 1 is equipped with an electric meter having a box and a current terminal and a voltage terminal projecting outward from one side of the box, and an electric test is performed by connecting the electric meter to a test apparatus. In the automatic wiring device for instruments, each comprises a pair of flat terminal boards, each of which has a current measurement terminal connected to a current terminal, and each of which comprises a pair of terminal boards, and a voltage measurement terminal connected to a voltage terminal. And a first spring which is provided so as to be movable with respect to the apparatus main body, is fitted to the outside of the first terminal plate and the second terminal plate of each current measurement terminal, and moves together. An automatic connection device for an electric meter is disclosed that includes a moving body having a pair of spring bodies made up of a body and a second spring body.

Japanese Patent No. 4767999

  Box-type watt-hour meters need to be tested for various functions before shipment. Even if the watt-hour meters are from the same manufacturer, the main body shape is different due to the difference in the rated current. There was a problem that a device had to be prepared. Also, if the projecting direction of the current terminal is slightly slanted or the finish accuracy of the surface of the current terminal is poor (rough) due to the assembled state of the watt-hour meter, contact between the current terminal and the current terminal contact member There may be a problem that the area cannot be sufficiently secured and overheating occurs in the current terminals.

Moreover, at the time of the test of a box-type watt-hour meter, a terminal may be damaged by pressing a metal member against the side surface having the largest area of the terminal, which may be misunderstood as a used product. There is a need for an automatic connection device for a watt-hour meter that can minimize scratches on the terminals of the watt-hour meter during testing.
Furthermore, the contact portion that contacts the terminal of the watt-hour meter has a complicated mechanism, a large number of parts, and a heavy maintenance work load. There is a need for a watt-hour meter automatic connection device with a simple structure and few parts replacement.

  Therefore, the present invention can test watt-hour meters with different specifications such as rated current and manufacturer, and can minimize scratches on the terminals of the watt-hour meter during testing, resulting in overheating. It is another object of the present invention to provide an automatic connection device for a watt hour meter that is excellent in maintainability.

A first invention is an automatic connection device for a box-type watt-hour meter comprising a main body and a plurality of current terminals extending from the back surface of the main body, and an instrument insertion port into which the box-type watt-hour meter is inserted from the back side; An instrument support for supporting the box-type watt-hour meter inserted in the instrument insertion port, a plurality of current terminal contact members connected to an external test device, and a plurality of current terminal contact members attached to the plurality of current terminals. A contact member urging mechanism that applies and exerts a force, and the current terminal contact member includes a groove having a pair of inclined surfaces that are symmetrical with respect to a line, and each of the pair of inclined surfaces corresponds to the current terminal. An automatic connection device for a watt-hour meter characterized by contacting an edge of a side surface other than the side surface having the largest area.
According to a second invention, in the first invention, the groove of the current terminal contact member is substantially V-shaped, arc-shaped or trapezoidal.
According to a third invention, in the first or second invention, the contact member urging mechanism includes a swing mechanism that supports each of the plurality of current terminal contact members so as to be swingable independently. To do.

According to a fourth invention, in the invention according to any one of the first to third aspects, a contact member moving mechanism for reciprocating the current terminal contact member in a vertical direction is further provided.
According to a fifth invention, in the invention according to any one of the first to third inventions, the box-type watt-hour meter inserted into the meter insertion opening and the current terminal contact member are reciprocated horizontally. The contact member moving mechanism is provided.
According to a sixth aspect, in the fifth aspect, the drop prevention mechanism includes a light receiver that detects a pulse from the light emitting unit of the box-type watt-hour meter.
According to a seventh invention, in the invention according to any one of the first to sixth inventions, the current terminal contact member includes the groove on each of a pair of opposing surfaces.
According to an eighth aspect of the present invention, in the invention according to any one of the first to seventh aspects, a length (L1) of a side surface of the current terminal contact member provided with the groove is a contact surface between the current terminal and the groove. The length (L2) exceeds twice the length (L2).
A ninth invention is characterized in that, in the invention according to any one of the first to eighth inventions, the instrument support part includes a support part moving mechanism for changing a support position of the box-type watt-hour meter.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the automatic connection apparatus of the watt-hour meter which can test the watt-hour meter from which specifications, such as a rated current and a manufacturer, differ.
In addition, it is possible to provide a wattmeter automatic connection device that can minimize scratches on the wattmeter terminals during the test, does not cause overheating, and is excellent in maintainability.

It is the perspective view which looked at the box-type watt-hour meter from the back side. It is a perspective view at the time of seeing the watt-hour automatic connection apparatus of 1st embodiment from upper direction. It is a perspective view at the time of removing a front plate and a top plate from FIG. It is a perspective view at the time of removing a lower support part, an upper support part, and a support part moving mechanism from FIG. It is a figure (CG) which shows the state which inserted the watt-hour meter in the meter insertion port. It is a figure which shows the state which made the current terminal contact member provided with a contact part contact the current terminal of a watt-hour meter. It is a rear view which shows the contact state of a current terminal contact member and a current terminal. It is a side view which shows the contact state of a current terminal contact member and a current terminal. It is explanatory drawing of the procedure of the connection operation | movement in the automatic connection apparatus of 1st embodiment. It is a graph which shows the test result of the temperature rise test in the automatic connection apparatus of 1st embodiment. It is explanatory drawing of the procedure of the connection operation | movement in the automatic connection apparatus of 2nd embodiment.

  A watt-hour automatic connection device according to a preferred embodiment of the present invention will be described with reference to the drawings. Hereinafter, a box-type watt-hour meter including three voltage terminals arranged in parallel to a direction orthogonal to the longitudinal direction of the main body and four current terminals arranged in parallel to a direction orthogonal to the longitudinal direction of the main body is described. An embodiment to be tested will be described. However, the technical idea of the present invention is a type that does not include a 2-wire (single-phase two-wire) and a three-wire (single-phase three-wire, three-phase three-wire) watt hour meter or voltage terminal (a type that includes only a current terminal). It is also possible to apply to the watt hour meter.

<< first embodiment >>
FIG. 2 is a perspective view of the watt-hour automatic connection device 1 of the first embodiment as viewed from above. 2 to 5, the three voltage terminal contact members 31 are not shown.
The watt-hour automatic connection device 1 is a box-shaped device including a base plate 2, a front plate 3, and a top plate 4. A contact portion 10 is provided on the base plate 2 that hits the back side of the front plate 3. The front plate 3 is provided with a meter insertion opening 5 that is slightly larger than the watt-hour meter main body 101. The meter insertion port 5 is sized to allow insertion of a home-use box-type watt-hour meter from any manufacturer.
Below, the case where the box-type watt-hour meter 100 having a rated current of 60 A shown in FIG. 1 is used as a test object will be described, but the watt-hour automatic connection device 1 of the present embodiment has the same terminal shape (cuboid shape). It can also be applied to a box-type watt-hour meter (for rated current 120A, 30A, etc.) having the same terminal mounting position and pitch between terminals.

  FIG. 3 is a perspective view of the watt-hour automatic connection device 1 from which the front plate 3 and the top plate 4 are removed as viewed from above. An instrument support portion including a lower support portion 12 and an upper support portion 13 is disposed inside the instrument insertion port 5 of the front plate 3. The lower support portion 12 can be reciprocated up and down by the support portion moving mechanism 21, and functions as a guide when the watthour meter main body 101 is inserted together with the upper support portion 13. The support part moving mechanism 21 is configured by, for example, an air cylinder or a mechanical cylinder.

  FIG. 4 is a perspective view of the watt-hour automatic connection device 1 with the lower support 12, the upper support 13 and the support moving mechanism 21 removed, as viewed from above. The contact portion 10 is provided with a current terminal pressing member 14 made of an insulator. The current terminal holding member 14 is provided to face the current terminal contact members 11a to 11d, and is disposed at a position located between the current terminals 102a to 102d and the voltage terminals 103a to 103c of the inserted watt hour meter 100. . As will be described later with reference to FIG. 9, the current terminals 102 a to 102 d of the watt hour meter inserted into the meter insertion port 5 are the current terminal holding member 14 located above and the current terminal contact member 11 a moved upward from below. It is connected in a state of being sandwiched between ˜11d.

FIG. 5 is a diagram (CG) showing a state in which the watt-hour meter 100 is inserted into the meter insertion slot 5.
When the watt-hour meter 100 is inserted into the meter insertion slot 5 and an electric signal indicating a meter selection instruction (not shown) is input, the support portion moving mechanism 21 moves the lower support portion 12 upward. When the watt-hour meter main body 101 is inserted by the lower support portion 12 and the upper support portion 13, the contact member moving mechanism 22 moves the current terminal contact members 11 a to 11 d upward to contact the current terminal 102. The contact member moving mechanism 22 is configured by, for example, an air cylinder or a mechanical cylinder.

FIG. 6 is a diagram illustrating a state in which the current terminal contact members 11a to 11d included in the contact unit 10 are brought into contact with the current terminals 102a to 102d of the watt-hour meter. Each of the current terminal contact members 11a to 11d has a V-shaped groove formed on the upper surface thereof, and the substantially V-shaped groove is in contact with the lower surface of the current terminals 102a to 102d. The current terminal contact members 11 a to 11 d according to the first embodiment are made of a copper block subjected to silver plating, and can be moved up and down by the contact member moving mechanism 22. Since the current terminal contact members 11a to 11d do not require a driving mechanism for sandwiching the current terminals 102a to 102d, the structure can be simplified and the structure can be made compact.
The contact member moving mechanism 22 has a standby position for waiting the current terminal contact members 11a to 11d downward, and a connection position for moving the current terminal contact members 11a to 11d upward to contact the current terminals 102a to 102d. ing.

  FIG. 7 is a rear view showing a contact state between the current terminal contact member 11 and the current terminal 102. The first embodiment is based on the technical idea that the two end surfaces of the current terminal contact member 11 are brought into contact with two sides (edges) of the side surface of the current terminal 102 other than the side surface having the widest area. That is, the current terminal contact member 11 of the first embodiment has a substantially V-shaped groove formed on the upper surface, and has specifications that the current terminal 102 comes into contact with two inner surfaces constituting the groove. The shape of the groove of the current terminal contact member 11 is not limited to a V-shaped cross section as long as it can be brought into contact with the current terminal 102 at the two end faces, and may be trapezoidal or arcuate, for example. On the other hand, if the contact surface of the current terminal contact member 11 is a flat surface and is joined by a plane in a positional relationship parallel to the plane of the current terminal 102, the current terminal 102 may vary depending on the thickness and end face finishing of each watt-hour maker. There may be insufficient contact area. Here, the case where the contact area with the current terminal 102 is insufficient means a case where overheating outside the JIS test standards occurs when a large current (for example, 30 A to 120 A) is passed. Therefore, a groove having a pair of inclined surfaces that are symmetrical with respect to the center line of the groove is provided on the surface of the current terminal contact member 11 that is in contact with the current terminal 102, and two surfaces having angles are provided on the current terminal 102. Make contact with the two sides. According to the present embodiment, even if the current terminal contact member 11 is moved upward and pressed against the current terminal 102, only two sides of the current terminal 102 or the periphery thereof are scratched. Can be made almost inconspicuous.

  Also, increasing the surface area of the current terminal contact member 11 is advantageous in terms of heat dissipation area. Furthermore, it is preferable to form a groove having the same shape as the contact surface on the surface located directly behind the contact surface of the current terminal contact member 11. The groove provided on the back surface increases the heat radiation area, and when the contact surface is worn or deteriorated, it can be rotated 180 degrees up and down and reattached to make the back surface a new contact surface. Is possible. From the viewpoint of rotating 180 degrees and reattaching, it is preferable to provide a structure (screw hole or the like) for attaching to the contact member moving mechanism 22 on the side surface of the current terminal contact member 11. In FIG. 6, the two holes provided on the widest side surface of the current terminal contact member 11 are screw holes for coupling to the connection member 15.

FIG. 8 is a side view showing a contact state between the current terminal contact member 11 and the current terminal 102. 7 is the front-rear direction of the current terminal contact member 11, the length L1 of the current terminal contact member 11 in the front-rear direction (longitudinal direction) is the length L2 of the front-rear direction of the contact surface with the current terminal 102. The length exceeds twice the length, for example, a length exceeding 2 to 5 times L2. Alternatively, the length L1 of the current terminal contact member 11 in the front-rear direction is longer than twice the length of the current terminal 102 in the front-rear direction, for example, 2-5 times the length of the current terminal 102 in the front-rear direction. It may be a length. By adopting such a configuration, when the contact surface is worn / deteriorated, it is possible to turn the surface 180 degrees back and forth and reattach it to make a surface without wear / deterioration a new contact surface.
The current terminal contact member 11 can be easily performed by removing the screw 16. If the current terminal contact member 11 can be remounted by rotating it 180 degrees in the vertical and horizontal directions, one member can be used four times longer.

FIG. 9 is an explanatory diagram of the procedure of the connection operation by the automatic connection device 1 of the present embodiment. In procedures (2) and (3), two of the three voltage terminal contact members 31 are not shown for convenience of explanation.
The procedure (1) is a diagram illustrating a state before the watt-hour meter 100 is inserted into the automatic connection device 1, and an upper diagram shows an upper diagram and a lower diagram shows a side diagram. The lower support part 12 is positioned at the height of the watt-hour meter to be tested by the support part moving mechanism 21. This is because the watt-hour meter 100 has a different vertical thickness due to differences in standards (for example, 60A, 120A) and the like, and thus the position of the lower support portion 12 needs to be variable. The support part moving mechanism 21 includes an elevating part 21a and a cylinder 21b. When an electric signal indicating a meter selection instruction (not shown) is input, the support part moving mechanism 21 moves the lower support part 12 to a corresponding height. The support unit moving mechanism 21 is preliminarily taught with height information according to the standard of the watt-hour meter 100.
In addition, the support part moving mechanism 21 is not an indispensable structure, and instead of the support part moving mechanism 21, adapter panels that are attached to the meter insertion port 5 and support the watt hour meter from the bottom are prepared for the number of watt hour standards. You may make it do.

Procedure (2) shows a state in which the watt hour meter 100 is inserted into the instrument insertion port 5 of the automatic connection device 1 and the voltage terminal contact member 31 is brought into contact with the voltage terminal 103.
The voltage terminal contact member 31 is disposed at the tip of a contact member urging mechanism 33 having an elastic member 32 made of a spring, and is connected to a test apparatus (not shown) via the contact member urging mechanism 33 and a voltage cable. Electrically connected. Unlike the current terminal contact member 11, the voltage terminal contact member 31 is composed of a cylindrical metal member. The voltage terminal contact member 31 can be applied with a voltage from the power supply device as long as it is in contact. If the voltage terminal contact member 31 is not in contact with the voltage terminal contact member 31, the voltage terminal 103 has a voltage (potential). Will occur. Further, the voltage terminal contact member 31 has no problem of overheating due to application of a large current. Therefore, the voltage terminal contact member 31 does not need to have a shape that can ensure a sufficient contact area unlike the current terminal contact member 11. However, the voltage terminal contact member 31 can naturally have the same shape as the current terminal contact member 11.

When the watt-hour meter 100 is inserted to a prescribed position illustrated by a dotted line, the voltage terminal contact member 31 is pushed inward by the voltage terminal 103, and the voltage terminal 103 and the voltage terminal contact member 31 are urged by the elastic member 32. It will be in the state contacted in the state where it was done.
In the present embodiment, the voltage terminal contact member 31 is in contact with the voltage terminal 103 from the rear, but is connected to the vertical movement mechanism facing the current terminal contact member 11 so as to be in contact with the voltage terminal 103 from above. May be.

Procedure (3) shows a state in which the current terminal contact member 11 is brought into contact with the current terminal 102.
The current terminal contact members 11a to 11d are coupled to the tip of a connection member 15 made of a metal plate, and are electrically connected to a test apparatus (not shown) via the connection member 15 and a current cable. The connecting member 15 has a plate-like shape having a vertical width equal to or greater than the side surface having the largest area of the current terminal contact member 11 so that a high heat dissipation effect can be obtained, and the current terminal contact member 11 has the largest area. It is joined so that the entire side surface is in contact.
When an electric signal for instructing the connection operation is input, the current terminal contact members 11a to 11d are moved upward by the contact member moving mechanism 22 and come into contact with the current terminals 102a to 102d. Here, since the current terminal holding member 14 is located above the current terminals 102a to 102d, the current terminals 102a to 102d are sandwiched between the current terminal contact members 11a to 11d and the current terminal holding member 14.

The contact member moving mechanism 22 includes an elevating part 22a, two cylinders 22b, and a support block 22c. A contact member biasing mechanism 23 is provided on the support block 22c.
The contact member biasing mechanism 23 includes a shaft that independently supports the four current terminal contact members 11a to 11d, an elastic member (spring) through which the shaft is inserted, and the shaft in the front-rear and left-right directions (for example, 1 to 2 mm). ) It is composed of a fixing member fixed so as to be swingable, and the current terminal contact member 11 is brought into contact with the current terminal 102 by applying a biasing force. This elastic member (spring) also has an effect of preventing an excessive force from acting on the current terminal 102 and the current terminal contact member 11 to break them.

  The contact member urging mechanism 23 supports the current terminal contact members 11a to 11d in a state having a play with respect to the shaft axis (a state in which the contact member is biased). That is, the contact member urging mechanism 23 functions as a swinging mechanism (play mechanism) for attaching the current terminal contact members 11a to 11d independently and with play to the support block 22c. It can absorb (displacement of position of current terminals 102a to 102d, difference in thickness, etc.).

  The automatic connection device 1 of the present embodiment is connected to a current terminal 102 and a voltage terminal 103 of a watt hour meter, a test device (not shown), a cable 6 and a terminal block 7. This test apparatus includes a plurality of types of automatic connectors and power supply devices corresponding to voltage terminals, current terminal arrangement dimensions, and terminal widths that differ depending on the rated voltage and rated current specifications of the watt-hour meter. For example, the automatic connector is prepared for each rated current, each rated voltage, each phase type, and each line type, and power is applied under test conditions (for example, 20 to 200% of the rating) based on the rated voltage and current. The The power supply device has a function of monitoring a load state during output, and a function of determining an overload when the load value increases to a certain level, stopping the output, and issuing an alarm.

FIG. 10 is a graph showing a test result of a temperature rise test at the watt-hour current terminal carried out using the automatic connection device 1 of the present embodiment. The graph of FIG. 10 shows a measurement with a thermocouple fixed to each terminal. 1S is a watt hour meter current terminal 102d, 3S is a current terminal 102c, 3L is a current terminal 102b, and 1L is a current terminal 102a. Yes.
According to the JIS test standard (JIS C1211-1 4.5), 110% of the rated frequency, rated voltage and rated current are simultaneously applied to the meter, and the temperature rise at the current terminal after 2 hours becomes the test start temperature. On the other hand, it is required to be + 40 ° C. or lower. In the test of FIG. 10, when a temperature rise test was performed by applying a current of 72A, which is 120% of the rated current, to a 60A box-type watt-hour meter, the current terminal 102d having the largest temperature rise value was + 12.4 ° C. It was confirmed that.

Since the automatic connection device 1 according to the first embodiment described above includes the lower support portion 12, the upper support portion 13, and the support portion moving mechanism 21, watt-hour meters having different rated currents are tested by the same automatic connection device. be able to.
Further, since the current terminal contact member 11 includes a pair of grooves having a pair of inclined surfaces that are line symmetric, a sufficient contact area is ensured even if the shape and interval of the current terminal 102 are slightly different due to differences in manufacturers. be able to.
In addition, since each of the pair of inclined surfaces of the current terminal contact member 11 contacts the edge of the side surface other than the side surface having the largest area (side surface adjacent to the side surface having the largest area), the current terminal 102 is tested. Scratches on 102 and the current terminal contact member 11 can be minimized.
Furthermore, the current terminal contact member 11 has a simple structure that does not have a drive mechanism for sandwiching the current terminal 102, and can be easily attached and detached with a screw.

<< Second Embodiment >>
The automatic connection device 1 of the second embodiment is different from the first embodiment in that the current terminal contact member 11 is brought into contact with the current terminal 102 from the horizontal direction. Below, it demonstrates centering around difference with 1st embodiment, and omits description about a common point. In steps (2) and (3) in FIG. 11, for convenience of explanation, two of the three voltage terminal contact members 31 and two of the four current terminal contact members 11 are not shown.
As shown in FIG. 11, in the second embodiment, four current terminal contact members 11 a to 11 d are disposed so as to be retractable in the horizontal direction by a contact member biasing mechanism 53 having an elastic member 52.
The contact member urging mechanism 53 has a shaft inserted through an elastic member 52 made of a spring, and acts to apply a biasing force to the current terminal contact member 11 to contact the current terminal 102. The contact member urging mechanism 53 functions as a swing mechanism that swings or swings the current terminal contact members 11a to 11d independently. That is, also in the second embodiment, the individual difference for each watt-hour meter can be absorbed by the swing mechanism.

  As in the first embodiment, the current terminal contact members 11a to 11d have V-shaped grooves formed on the contact surfaces. The current terminal contact members 11a to 11d are set to have vertical lengths so as to be compatible with watt-hour meters of different standards. That is, the vertical lengths of the current terminal contact members 11a to 11d are set to be significantly longer than the current terminal 102 of the 60A watt hour meter and slightly longer than the current terminal of the 120A watt hour meter. ing. The current terminal contact members 11a to 11d are electrically connected to a test apparatus (not shown) via the contact member biasing mechanism 53 and a current cable.

  The configuration of the voltage terminal contact member 31, the elastic member 32, and the contact member biasing mechanism 33 of the second embodiment is the same as that of the first embodiment. A contact member urging mechanism 33 having an elastic member (spring) 32 acts to bring the voltage terminal contact member 31 into contact with the voltage terminal 103 by applying an urging force. The contact member urging mechanism 33 is preferably provided with a swing mechanism that swings or swings the voltage terminal contact members 31a to 31c independently.

  When the watt-hour meter 100 is inserted to the specified position shown by the dotted line, the current terminal contact member 11 is pushed in the back direction by the current terminal 102 and the voltage terminal contact member 31 is pushed in the back direction by the voltage terminal 103, Each of the contact members (11, 31) comes into contact with each terminal while being urged by the elastic members (32, 52). Since a significantly larger current is applied to the current terminal contact member 11 than the voltage terminal contact member 31, the urging force of the elastic member 52 needs to be larger than that of the elastic member 32. Therefore, there is a possibility that the current terminals 102 a to 102 d are pushed by the current terminal contact members 11 a to 11 d from the direction facing the insertion direction of the watt hour meter 100 and fall off from the instrument insertion port 5. Therefore, as shown in FIG. 11, a drop-off prevention mechanism 40 that presses the front surface of the watt-hour meter 100 (the surface located on the opposite side of the insertion port) is provided.

  The drop-off prevention mechanism 40 includes a U-shaped fixing lever 41 and a pair of rotating members 42 that allow the fixing lever 41 to rotate up and down by a predetermined angle. When inserting the watt-hour meter 100 into the meter insertion port 5, the meter insertion port 5 is opened with the fixing lever 41 in the upper position, and when testing, the fixing lever 41 is in the lower position and the front of the watt-hour meter 100 is pressed down. Is preventing.

  Furthermore, in 2nd embodiment, the light receiver 43 which detects the pulse from the light emission part 44 of the watt-hour meter 100 is provided. The light emitting unit 44 of the watt-hour meter 100 is composed of an infrared light emitting device, and transmits a measurement pulse signal. By detecting the measurement pulse signal by the light receiver 43 and transmitting it to the test device, various tests can be automatically performed. Is possible.

  In the second embodiment, a driving device such as a cylinder for reciprocating the current terminal contact member 11 is not required. Therefore, the structure of the automatic connection device 1 can be easily configured as compared with the first embodiment.

  As mentioned above, although preferable embodiment of this invention was described, the technical scope of this invention is not limited to description of the said embodiment. Various modifications and improvements can be added to the above embodiment. The form which added such a change or improvement is also contained in the technical scope of the present invention.

1: watt-hour meter automatic connection device 2: base plate 3: front plate 4: top plate 5: instrument insertion port 6: cable 7: terminal block 10: contact portion 11: current terminal contact member 12: lower support portion 13: upper portion Support part 14: Current terminal pressing member 15: Connection member 16: Screw 21: Support part moving mechanism 22: Contact member moving mechanism 23: Contact member biasing mechanism 31: Voltage terminal contact member 32: Elastic member 33: Contact member biasing Mechanism 40: Drop-off prevention mechanism 41: Fixed lever 42: Rotating member 43: Light receiver 44: Light emitting unit 52: Elastic member 53: Contact member biasing mechanism 100: Box-type watt-hour meter 101: Watt-hour meter body 102: Current Terminal 103: Voltage terminal

Claims (9)

In an automatic connection device of a box-type watt-hour meter comprising a main body and a plurality of current terminals extending from the back of the main body,
A meter insertion opening into which a box-type watt-hour meter is inserted from the back side;
An instrument support that supports the box-type watt-hour meter inserted in the instrument insertion port;
A plurality of current terminal contact members connected to an external test device;
A contact member biasing mechanism that applies a biasing force to the plurality of current terminals to contact the plurality of current terminal contact members;
The current terminal contact member includes a groove having a pair of inclined surfaces that are line-symmetric, and each of the pair of inclined surfaces contacts an edge of a side surface other than the side surface having the widest area of the current terminal. An automatic connection device for watt-hour meters.   2. The automatic connection device for an electric energy meter according to claim 1, wherein the groove of the current terminal contact member is substantially V-shaped, arc-shaped or trapezoidal.   3. The watt-hour meter automatic according to claim 1, wherein the contact member urging mechanism includes a swing mechanism that supports each of the plurality of current terminal contact members so as to be swingable independently. 4. Termination device.   4. The automatic watt-hour meter connection device according to claim 1, further comprising a contact member moving mechanism for reciprocally moving the current terminal contact member in a vertical direction. In addition, a box-type watt-hour meter that is inserted into the meter insertion slot,
The automatic connection device for a watt-hour meter according to any one of claims 1 to 3, further comprising a contact member moving mechanism for reciprocally moving the current terminal contact member in a horizontal direction.   6. The automatic watt-hour meter connection device according to claim 5, wherein the drop-off prevention mechanism includes a light receiver that detects a pulse from a light-emitting unit of the box-type watt-hour meter.   The automatic connection device for a watt-hour meter according to any one of claims 1 to 6, wherein the current terminal contact member includes the groove on each of a pair of opposing surfaces.   The length (L1) of the side surface provided with the groove of the current terminal contact member is more than twice the length (L2) of the contact surface between the current terminal and the groove, An automatic connection device for a watt-hour meter according to any one of claims 1 to 7.   The automatic connection device for an watt-hour meter according to any one of claims 1 to 8, wherein the meter support portion includes a support portion moving mechanism that makes a support position of the box-type watt-hour meter variable.