JP2015184227A - Stationary terminal with built-in current transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stationary terminal with built-in current transformers that can be connected with the terminal section of an existing instrument and has good workability during connection.SOLUTION: To provide a stationary terminal with built-in current transformers that has a body with built-in current transformers, being connected between an instrument and distribution lines, and comprising rod terminals as a secondary terminal connected to the instrument and fixtures for fixing the rod terminals so that the rod terminals form one lateral line relative to the body at a predetermined pitch.

Description

  The present invention relates to a stationary terminal with a built-in current transformer that is used, for example, in a meter of a watt hour meter.

  Generally, watt-hour meters are classified into a single instrument that is used alone without being combined with an instrument transformer, and an instrument with a transformer that is used in combination with a current transformer or an instrument transformer. Due to the limited wall area available for instrument mounting, traditionally large current transformers or instrument transformers have been placed in a separate installation space from the instrument, both of which are screwed Connected by tightening.

  However, the instrument has a fixed examination deadline and is required to be replaced every predetermined period. When replacing the instrument, the work of attaching and detaching the electric wire fixed by screw tightening from the instrument is complicated, and it is necessary to lay a protective sheet or the like at a site where the charging part is exposed for safety. In addition to the current terminal to which the output current from the current transformer or the like is supplied, the terminal portion of the instrument has a voltage terminal that is used for voltage detection between lines and generation of circuit power for the instrument. Seven electric wires (in the case of a three-phase three-wire system) connected to the terminal are attached to the instrument. Therefore, there is a possibility that the electric wires of different polarities removed from the meter may be brought into contact with each other, and there is a risk of erroneous connection when connecting to the meter, both of which may lead to a serious accident. In addition, when performing instrument replacement work without an uninterruptible power supply, the conventional bypass construction is expensive and time-consuming, and requires advanced technology that is difficult for non-experts.

  On the other hand, Japanese Patent Application Laid-Open No. 2010-145265 proposes a stationary terminal with a built-in current transformer that holds the current transformer in a sealed space of the stationary terminal. In JP 2010-145265 A, a current transformer is reduced in size, and the whole including the current transformer and the instrument is accommodated in the installation space of the conventional instrument. In the stationary terminal with a built-in current transformer disclosed in Japanese Patent Application Laid-Open No. 2010-145265, the workability of instrument replacement is improved by using a connector for connection with the instrument. However, this configuration requires the instrument to have a dedicated connector that is connected to the stationary terminal connector.

JP 2010-145265 A

  The present invention can be connected to a terminal portion of an existing instrument by a simple operation without fear of contact between different-polarity wires, and therefore the time required for the instrument replacement operation can be drastically reduced. An object is to provide a stationary terminal with a built-in current collector. Another object of the present invention is to provide a stationary terminal with a built-in current transformer that can improve the workability of the exchange of the instrument without a power failure and can drastically reduce the time required for the exchange of the instrument. Another object of the present invention is to provide a stationary terminal with a built-in current transformer that is excellent in assemblability.

  According to the first aspect of the present invention, there is provided a main body including a current transformer, and a stationary terminal with a built-in current transformer connected between the instrument and the distribution line, as a secondary terminal connected to the instrument. There can be provided a stationary terminal with a built-in current transformer, comprising: a bar terminal; and a fixture for fixing the bar terminal so that the bar terminal is arranged in a horizontal row with respect to the main body at a predetermined pitch. According to this configuration, the rod terminals can be fixed in advance in an arrangement corresponding to the arrangement of the terminal portions of the existing instrument, and can be connected to the terminal portions of the existing instrument by screwing. Therefore, it is possible to connect a stationary terminal with a built-in current transformer that can be connected to a terminal portion of an existing meter without using a dedicated connector and without fear of erroneous connection.

  According to invention of Claim 2, it is a stationary terminal with a built-in current transformer of Claim 1, Comprising: It has a front-end | tip part which protrudes through the base end part connected to a distribution line, and the through-hole of a current transformer. A primary terminal and an upper cover that covers the tip of the primary terminal. The upper cover has an opening that exposes the bar terminal to the outside, and the opening is movable in the opening. It is possible to provide a stationary terminal with a built-in current transformer that is dimensioned in some way. According to this configuration, it is possible to prevent the primary side charging unit from being exposed by the upper cover, and it is possible to prevent entry of foreign matter into the stationary terminal and third party mischief. Further, by making the fixture movable within the opening of the upper cover, it is possible to easily connect the rod terminal to the terminal portion of the meter.

  According to invention of Claim 3, it is a stationary terminal with a built-in current transformer of Claim 2, Comprising: The terminal cover attached to the front surface of a main body so that at least the base end part of a primary terminal may be covered is provided, The current transformer is used in a state where the cover is attached to the main body at one of a first position that covers the entire front surface of the main body and a second position that is inverted vertically with respect to the first position. A built-in stationary terminal can be provided. With this configuration, for example, only the secondary output part of the current transformer is exposed at the second position, and the short-circuiting operation required when replacing the instrument is performed without fear of the operator touching the primary charging part. be able to. Conventionally, a protective sheet or the like is required for safety in a portion where a live part is exposed when the instrument is exchanged. According to the invention of claim 3, the terminal cover is simply reversed. Safety can be ensured by simple work.

According to a fourth aspect of the present invention, there is provided the stationary terminal with a built-in current transformer according to the third aspect, wherein the terminal cover includes a base end portion of the primary terminal and a secondary output portion of the current transformer at the first position. To provide a stationary terminal with a built-in current transformer that covers both and exposes only the secondary output part of the current transformer among the secondary terminal of the primary terminal and the current transformer in the second position. it can. With this configuration, it is possible to perform a short-circuiting operation required when replacing the instrument without fear of the operator touching the primary charging unit.
According to invention of Claim 5, it is a stationary terminal with a built-in current transformer of Claim 4, Comprising: The short circuit apparatus which short-circuits the secondary output part of a current transformer is provided, A terminal cover is in a short circuit state. It is possible to provide a stationary terminal with a built-in current transformer that has a protrusion at a position where it interferes with a short-circuit device. According to this configuration, since the short circuit device interferes with the protrusion of the terminal cover during the short circuit state, the terminal cover cannot be closed. Therefore, it is possible to reliably prevent the operator from forgetting to cancel the short-circuit state after the end of the instrument replacement operation without a power failure.

  According to the invention of claim 6, the stationary terminal with built-in current transformer according to claim 2, wherein the upper cover has a fixing projection for fixing the current transformer within the main body. Can be provided. With this configuration, the current transformer can be reliably fixed in a stable state without causing play in the main body.

  According to the invention of claim 7, the current transformer built-in stationary terminal according to claim 2, wherein at least one of the upper cover and the main body is formed with a holder portion that accommodates the test seal slip of the current transformer. A stationary terminal with a built-in current transformer can be provided. With this configuration, when the upper cover is attached to the main body after the verification work, there is no possibility that the verification seal slip is sandwiched between the upper cover and the main body to prevent the attachment.

  According to invention of Claim 8, it is a stationary terminal with a built-in current transformer as described in any one of Claims 2-7, Comprising: A primary terminal is a plate type terminal extended linearly, Current transformer A built-in stationary terminal can be provided. With this configuration, the assembling property of the stationary terminal can be improved as compared with the case where a primary terminal having a bend or the like is used. In addition, since a plurality of primary terminals can have the same shape, the number of parts can be reduced, capital investment such as molds can be suppressed, and mass production efficiency can be increased.

  According to the present invention, it is possible to connect to a terminal portion of an existing instrument by a simple operation without fear of contact between different-polarity wires, and thus the time required for the instrument replacement operation can be dramatically shortened. A stationary terminal with a built-in current transformer can be provided. Moreover, according to the present invention, it is possible to provide a stationary terminal with a built-in current transformer that can improve the workability of the instrument exchange without a power failure and can drastically reduce the time required for the instrument exchange work. Moreover, according to this invention, the stationary terminal incorporating a current transformer excellent in assemblability can be provided.

It is a front view which shows the stationary terminal with a built-in current transformer by one Embodiment of this invention with a meter. It is an internal connection figure of a stationary terminal and a meter. It is a figure which shows the positional relationship of a primary terminal and a current transformer. It is the perspective view which looked at the stationary terminal main body with which the upper cover was attached from the primary terminal side. It is the perspective view which looked at the stationary terminal main body with which the upper cover was attached from the secondary terminal side. It is a figure which shows arrangement | positioning of the fixing tool with respect to a stationary terminal main body. It is a disassembled perspective view which shows a stationary terminal main body, a bar terminal assembly, and an upper cover. It is a disassembled perspective view of a bar terminal assembly. (A) is a front view which shows the 1st part of a fixing tool, (B) is a rear view which shows the 1st part of a fixing tool. FIG. 6 is a rear view of the second part of the fixture. It is a figure which shows the positional relationship of a current transformer and an upper cover. It is a figure which shows a holder part. It is a figure which shows attachment of the terminal cover to a stationary terminal main body. It is a figure which shows the 1st position of a terminal cover. It is a figure which shows the 2nd position of a terminal cover. It is a figure which shows an example of a short circuit apparatus. (A) shows a non-short-circuit state, and (B) shows a short-circuit state. It is a figure which shows the protrusion of a terminal cover. It is a partially broken perspective view which shows the positional relationship of the protrusion of a terminal cover, and a short circuit apparatus.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[Overview]
FIG. 1 shows a current transformer built-in stationary terminal (hereinafter, stationary terminal) 1 according to an embodiment of the present invention together with a meter 2. The meter 2 is, for example, an electronic watt-hour meter. The stationary terminal 1 is usually used by being attached to a wall surface of a building together with the instrument 2 via an attachment plate (not shown). In the following description, terms indicating directions such as “up”, “down”, “left”, “right”, “front”, “rear”, “front”, “back”, “back”, etc. Unless otherwise specified, the stationary terminal 1 and the instrument 2 are used as attached to the wall surface.

  1 to 3, the stationary terminal 1 includes a main body 4 having a built-in current transformer 3, and is connected between the meter 2 and the distribution line 5 (KU, LU, V, KW, LW). Is done. As an example, the stationary terminal 1 of the present embodiment can be connected to an electronic watt hour meter having a rated current of 5A, for example, as an alternative to a large capacity electronic watt hour meter having a rated current of 250A or the like. A combination of a stationary terminal 1 with a built-in current transformer and an electronic watt hour meter with a rated current of 5 A can be used (an example of an internal connection diagram of the stationary terminal and the meter is shown in FIG. 2). As shown in FIG. 1, the distribution line 5 (KU, LU, V, KW, LW) is crimped to the crimp terminal 6 at its distal end and screwed to the proximal end 7 b of the primary terminal 7. The current of the primary terminal (primary current terminal) 7 is multiplied by a specified current transformation ratio by the pair of left and right current transformers 3 and output from the secondary output unit (secondary current terminal) 8 of the current transformer 3. Each tip 7c of the primary terminal 7 extends through a through hole of the substantially ring-shaped current transformer 3. FIG. 3 shows the positional relationship between the primary terminal 7 and the current transformer 3. As shown in FIG. 3, the primary terminal 7 is a plate-type terminal extending linearly. Reference numeral 9 denotes a bar terminal as a secondary terminal connected to the terminal portion 2 a of the meter 2. As will be described later, the bar terminal 9 is attached to the main body 4 in the form of an assembly temporarily fixed to the fixture 10 (hereinafter referred to as a bar terminal assembly). 1 and 3, the secondary side of the main body 4 of the stationary terminal 1 is shown in a state of being covered with an upper cover 102 described later, and the secondary output portion (secondary current) of the current transformer 3 is shown. Only the terminal 8) is exposed.

[About the unit]
The main body 4 is a secondary side where the primary side connection part 4a where the base end part 7b of the primary terminal 7 connected to the distribution line 5 is arranged, and the current transformer 3 and the distal end part 7c of the primary terminal 7 are arranged. The connection part 4b is provided. The primary side connection part 4 a and the secondary side connection part 4 b are formed integrally with each other via the partition wall 40. That is, the partition 40 forms an upper wall of the primary side connection portion 4a and forms a lower wall of the secondary side connection portion 4b. FIG. 4A is a perspective view of the stationary terminal 1 as viewed from the primary connection part 4a side.

  As shown in FIG. 4A, the primary side connection portion 4 a has left and right side walls 41, 42 and a rear wall 43 continuous to the side walls 41, 42, and is in a recess surrounded by the side walls 41, 42 and the rear wall 43. A partition wall 44 protrudes in parallel with the left and right side walls 41, 42, and the base end 7 b of the primary terminal 7 is fixed to the rear wall 43 between each of the side walls 41, 42 and the partition wall 44. Further, the lower wall 45 extends forward from the rear wall 43 so as to prevent the crimp terminal 6 (see FIG. 1) fixed to the base end portion 7 b of the primary terminal 7 from coming off from the main body 4. In addition, the base end part 7b of the two (V) primary terminals 7 is arrange | positioned between the two center partition walls 44 in the state piled up back and forth. Reference numeral 46 denotes a screw hole for attaching a terminal cover 103 to be described later to the front surface of the main body 4, and reference numerals 47a and 47b denote attachment holes for attaching the stationary terminal 1 to the above-described attachment plate.

  A screw hole 7 a (see FIG. 3) for receiving a screw 200 for fixing the distribution line 5 is formed in the base end portion 7 b of each primary terminal 7. An opening for receiving the screw 200 is also formed in the crimping portion of the crimping terminal 6, and the distribution line 5 is connected to the primary terminal by screwing the screw 200 passed through the opening of the crimping portion into the screw hole 7 a. 7 can be fixed to the base end portion 7b. Further, a through hole (not shown) is formed in the partition wall 40 between the primary side connection part 4a and the secondary side connection part 4b, and each tip part 7c of the primary terminal 7 passes through these through holes. Extending into the secondary connection 4b. As described above, the primary terminal 7 is a plate-type terminal extending linearly. By making the primary terminal 7 into a plate-type terminal extending linearly in this way, for example, the assemblability of the stationary terminal 1 can be compared with a primary terminal having a bend as described in JP 2010-145265 A, for example. Can be improved. Moreover, since the several primary terminal 7 can be made into the same shape, the kind of components can be reduced, the capital investments, such as a metal mold | die, can be suppressed, and mass production efficiency can be made high.

  FIG. 4B is a perspective view of the main body 4 as viewed from the secondary connection portion 4b side. In the secondary side connection part 4b, either one of the primary terminals 7 on the one side (KU, LU) (LU in the present embodiment) and one of the primary terminals 7 on the three sides (KW, LW) On the other hand, a pair of left and right current transformers 3 are arranged so that the tip portion 7c (KW in this embodiment) passes through the through hole of the current transformer 3 (see FIG. 3). Each primary terminal 7 has substantially the same length, and as shown in FIG. 3, the tip 7c of the primary terminal 7 on one side (KU, LU) is screwed to the left and right ends of the conductor 11, respectively. Similarly, the tip 7c of the primary terminal 7 on the three sides (KW, LW) is screwed to the left and right ends of the conductor 11, respectively. The conductor 11 is connected to one end of a lead wire 12 to be described later.

  FIG. 5 shows a state where the upper cover 102 on the secondary side of the main body 4 is removed. The current transformer 3 has a substantially ring shape having a through hole through which the tip 7c of the primary terminal 7 passes, and the outer side of the current transformer 3 leaves a secondary output portion 8 to which the lead wire 12 is connected, and is predetermined. It can be covered with a resin molded into the shape. The thickness of the current transformer 3 is set to be smaller than the protruding length of the primary terminal 7 from the partition wall 40 so that the tip 7c of the primary terminal 7 protrudes. A notch 48a is formed on the inner surface of the front wall 48 of the secondary side connecting portion 4b so that the pair of left and right current transformers 3 are positioned, and a curved groove 49a is formed on the inner surface of the rear wall 49. The notch 48 a and the curved groove 49 a are formed along the outer shape of the current transformer 3. As described above, the distal end portion 7c of the primary terminal 7 passing through the through hole of the partition 40 is also disposed between the left and right current transformers 3 and on both sides.

  On the upper portion of the rear wall 49, a holding portion 50 for holding the fixture 10, and consequently the bar terminal assembly is formed. FIG. 6 is an exploded perspective view showing the main body 4, the bar terminal 9 to which the lead wire 12 is connected and temporarily fixed by the fixture 10, and the upper cover 102. As shown in FIG. 6, the holding part 50 includes a recess formed by a rear wall 50a and left and right side walls 50b, and the fixture 10 is held in the recess of the holding part 50 as shown in FIG. . As will be described later, the front side of the holding portion 50 is opened in order to allow movement of the fixture 10 in the front-rear direction during the connection work between the stationary terminal 1 and the instrument 2.

[About bar terminal assembly]
As shown in FIG. 5, the bar terminal 9 is temporarily fixed to the fixture 10 and is disposed in the holding portion 50 of the main body 4 in the form of a bar terminal assembly. As shown in FIG. 6, the bar terminal 9 is connected to the conductor 11 connected to the primary terminal 7 and the secondary output portion 8 of the current transformer 3 by a lead wire 12. FIG. 7 is an exploded perspective view of the bar terminal assembly. In addition, the structure of the fixing tool 10 demonstrated below is only an example, and does not limit the specific structure of the fixing tool used for this invention. As shown in FIG. 7, the bar terminal assembly is formed by a bar terminal 9 and a fixture 10, and the fixture 10 includes a first portion 100 having an opening 100 a through which the bar portion 9 b of the bar terminal 9 passes, And a second portion 101 that engages with the first portion 100 and prevents the rod terminal 9 from coming off from the opening 100a. The bar terminal 9 is sandwiched between the first portion 100 and the second portion 101. Specifically, the bar terminal 9 is temporarily fixed by the fixture 10 in a state where the tip end portion of the lead wire 12 is crimped to the crimping portion 9a of the bar terminal 9, and at this time, as shown in FIG. Nine rod portions 9 b are exposed from the fixture 10.

  8A and 8B are a front view and a rear view of the first portion 100, and FIG. 9 is a rear view of the second portion. As shown in FIG. 7, in the first portion 100, the side shown in FIG. 8A (in other words, inside) and the second portion 101 in the side shown in FIG. 9 (in other words, The rod terminals 9 are clamped by being combined so that the inner side faces each other.

  Referring to FIGS. 7 to 9, the first portion 100 includes a crimping portion accommodating portion 100 f that forms a recess defined by the upper wall 100 b, the front wall 100 c, the rear wall 100 d, and the left and right side walls 100 e, and is in the recess. The crimping part 9a of the bar terminal 9 is accommodated. The opening 100a through which the bar portion 9b of the bar terminal 9 passes is formed in the upper wall 100b of the crimp housing part 100f. A partition wall 100g is disposed between the left and right sidewalls 100e of the crimp housing 100f in parallel with the sidewall 100e at a predetermined pitch corresponding to the terminal pitch of the instrument terminal portion 2a. Each bar terminal 9 is inserted into a space defined therebetween. The side wall 100e has a length that substantially covers the crimping portion 9a in the length direction, and the partition wall 100g has a length that sufficiently exceeds the side wall 100e so that the adjacent bar terminals 9 are reliably insulated. It extends to the lower part of the crimping part accommodating part 100f. The rear wall 100d also extends downward beyond the crimping portion accommodating portion 100f, and is configured such that its lower end is inserted into the holding portion 50 along the rear wall 50a of the holding portion 50. The first portion 100 also has a notch portion 100h formed at the left and right ends of the rear wall 100d and a pair of openings 100i formed at the center portion, and a claw portion 101d formed in the second portion 101. (Described later) passes through the notch 100h and the opening 100i and is configured to engage with the rear wall 100d. Further, a projection 101e (described later) formed in the second portion 101 is passed through the opening 100j formed between the opening 100i and the notch 100h.

  The second portion 101 includes an upper wall 101a having an upper surface that engages with an end of the crimping portion 9a to prevent the crimping portion 9a from being removed, and left and right sidewalls 101b that are formed continuously from the upper wall 101a. A partition wall 101c is provided between the side walls 101b at regular intervals. The claw portion 101d is formed on the left and right side walls 101b and a pair of central partition walls 101c, and the above-described protrusions 101e are formed on the remaining partition walls 101c.

  When assembling the rod terminal assembly, the rod portion 9b of the rod terminal 9 connected to the tip of each lead wire 12 by crimping is passed through the opening 100a of the first portion 100, and the crimping portion 9a is passed through the crimping portion accommodating portion 100f. Insert into. Next, the lead wire 12 is disposed in the space V between each of the side wall 101b and the partition wall 101c of the second portion 101, and the projection 101e and the central claw portion 101d of the second portion 101 are respectively corresponding to the first portions. The second portion 101 is positioned with respect to the first portion 100 by inserting the second portion 101 into the openings 100j and 100i. The engagement between the first part 100 and the second part 101 is to engage the rear wall 100d of the first part 100 with the side wall 101b of the second part 101 and the claw part 101d of the partition wall 101c. It is done by. The space V into which the lead wire 12 is inserted is set to a dimension that the crimping portion 9a cannot pass through. That is, the dimension is set such that the crimping part 9a accommodated in the crimping part accommodating part 100f contacts the upper surface of the upper wall 101a of the second part 101. Thus, a bar terminal assembly in which the bar terminal 9 is temporarily fixed to the fixture 10 is formed. The bar terminal assembly is disposed in the holding portion 50 so that the rear wall 100d of the first portion 100 is along the rear wall 50a of the holding portion 50. The rod terminal 9 is connected to the terminal portion 2a of the meter 2 by screwing as in the conventional case.

Thus, by using the fixture 10, the rod terminals 9 can be easily aligned horizontally with the main body 4 in accordance with the existing arrangement of the instrument terminal portions without the need for screw fastening of the electric wires. It can be fixed in advance at a predetermined pitch, and can be connected to a terminal portion of an existing instrument by screwing as in the conventional case. Therefore, unlike the connection work for each electric wire conventionally performed on the secondary side, the connection work with the existing instrument can be smoothly performed without the risk of erroneous connection and without providing a dedicated connector for the instrument. it can.
As described above, the specific configuration of the fixture 10 used in the present invention is not limited to that described in the present embodiment. The fixture 10 may be anything that can arrange and fix the bar terminals 9 in a horizontal row with respect to the stationary terminal body 4 at a predetermined pitch corresponding to the terminal pitch of the instrument terminal portion 2a. The bar terminal assembly may be configured by fixing the bar terminal 9 to the fixture 10 in the form of, using a means such as an adhesive, a screw, or ultrasonic welding. As means for fixing the bar terminal 9 to the fixture 10, various fixing means generally known to those skilled in the art can be used, and these means are included in the scope of the present invention. .

[About the top cover]
The stationary terminal 1 further includes an upper cover 102 as shown in FIG. 6, which has an opening 102 a that covers the distal end portion 7 c of the primary terminal 7 and exposes the rod portion 9 b of the rod terminal 9 to the outside. The bar terminal 9 is temporarily fixed by the fixture 10 inside the upper cover 102. The opening 102a is dimensioned such that the fixture 10, and thus the bar terminal assembly, is movable within the opening 102a. As shown in FIG. 1, the terminal portion 2 a of the conventional meter 2 generally has an insertion hole 201 for a distribution line, and the insertion hole 201 is opened below the meter 2. When the stationary terminal 1 is connected to the instrument 2, the bar portion 9 b of the bar terminal 9 is inserted into each insertion hole 201 and screwed. The bar terminal 9 has flexibility like the distribution line 5. Not. Therefore, as described above, the front side of the holding portion 50 of the main body 4 is opened, and the size of the opening 102a of the upper cover 102 is allowed to move forward, backward, left and right within the opening 102a. Therefore, the rod terminal 9 can be smoothly inserted into and removed from the insertion hole 201. Thereby, connection with the bar terminal 9 and the terminal part 2a of the meter 2 can be performed easily. In order to make the insertion / extraction of the bar terminal 9 with respect to the insertion hole 201 smoother, the lead wire 12 preferably has the highest possible flexibility. The upper cover 102 is screwed to the rear wall 49 of the main body 4 on the back side.

  In addition, a protrusion 102 b that can contact the outer surface of the current transformer 3 is formed on the inner surface of the upper cover 102. FIGS. 10A and 10B show the positional relationship between the current transformer 3 and the upper cover 102. Although the current transformer 3 is positioned by the notch 48a and the curved groove 49a of the main body 4 described above, there is a possibility that rattling occurs in the vertical direction. If the current transformer 3 is rattled, the outer mold resin of the current transformer 3 is rubbed with surrounding members to generate powder and become foreign matter. As shown in FIG. 10B, the current transformer 3 is sandwiched between the protrusion 102 b and the partition wall 40 of the main body 4, so that the backlash in the vertical direction of the current transformer 3 can be reliably prevented. If desired, a cushioning material such as rubber or sponge may be inserted between the protrusion 102b and the current transformer 3.

  Further, as shown in FIG. 6, the upper cover 102 includes a sealing hole 102 c through which a sealing line (in other words, a wire) is passed after the current transformer 3 is tested. The main body 4 is also provided with a sealing hole 48b at a position corresponding to the sealing hole 102c, and sealing is performed through a wire through these sealing holes 102c and 48b.

  The current transformer 3 of the stationary terminal 1 is tested at regular intervals, and after the test is finished, as shown in FIG. 11, sealing wires (wires) are passed through the sealing holes 102c and 48b, and the sealing material 105 is passed through. By attaching, the current transformer 3 is sealed in the stationary terminal 1. At this time, a plate-shaped test seal slip 106 certifying that the inspection has passed is attached to the sealing material 105, but the side wall of the upper cover 102 has a recess in which the plate-shaped seal slip 106 is inserted and held. A holder portion 102e to be formed is provided. The holder portion 102e may be provided on the main body 4. By providing the holder portion 102e, there is no possibility that the verification seal slip 106 will be sandwiched between the terminal cover 103 and the main body 4 when the terminal cover 103, which will be described later, is attached to the main body 4 after the verification operation. Work can be done smoothly.

[About terminal cover]
When using the measuring instrument 2, a terminal cover 103 as shown in FIG. 12 is attached to the front surface of the main body 4 of the stationary terminal 1. As shown in FIG. 12, the secondary side of the front surface of the main body 4 is already covered with the upper cover 102, and only the secondary output unit 8 of the current transformer 3 is exposed to the outside. Accordingly, the terminal cover 103 is attached to the front surface of the main body 4 so as to cover at least the base end portion 7 b of the primary terminal 7. 13A and 13B are perspective views of the terminal cover 103 attached to the front surface of the main body 4 at the first position and the second position, respectively. The terminal cover 103 covers the entire front surface of the main body 4. The first position as shown in FIG. 13A and the second position as shown in FIG. 13B inverted in the vertical direction with respect to the first position. Either of them is used in a state of being attached to the main body 4. In the first position shown in FIG. 13A, both the base end portion 7 b of the primary terminal 7 that is a charging unit and the secondary output unit 8 of the current transformer 3 are covered with the terminal cover 103. On the other hand, in the second position, only the secondary output portion 8 of the current transformer 3 is exposed among the base end portion 7 b of the primary terminal 7 and the secondary output portion 8 of the current transformer 3. For example, when the secondary output unit 8 needs to be short-circuited, for example, when the meter 2 is replaced without a power failure, the screw 103 a that fixes the terminal cover 103 to the main body 4 at the first position is removed from the screw hole 46. The terminal cover 103 can be fixed to the main body 4 at the second position by removing the terminal cover 103 from the main body 4, turning it up and down, and attaching the screw 103 a to the screw hole 46 again. At this time, since the primary side charging unit is completely covered with the terminal cover 103 and the upper cover 102, the operator can smoothly perform the short-circuiting operation without fear of touching the primary side charging unit. The short-circuiting operation is performed, for example, using a short-circuit device such as a hook-shaped short-circuit piece 8a attached to one of the secondary output parts 8 having the same polarity as shown in the figure. In the present embodiment, the short-circuiting operation includes a pair of secondary output sections 8 on one side (KU, LU) and a pair of secondary output sections 8 on the third side (KW, LW), respectively, as hook-shaped short-circuit pieces 8a. It is done by connecting with. 14A and 14B show the non-short-circuited state and the short-circuited state of the short-circuit piece 8a, respectively. In addition, the short circuit apparatus used for this invention is not restricted to the short circuit piece 8a of illustration, For example, arbitrary short circuit structures, such as a banana clip or an alligator terminal, can be used.

After the instrument replacement work is completed, it is necessary to reverse the terminal cover 103 in the vertical direction again and fix it to the main body 4 at the first position. At this time, in order to prevent the operator from forgetting to cancel the short-circuit state The terminal cover 103 has a protrusion 103b as shown in FIG. The protrusion 103b is formed at a position where it interferes with (in other words, contacts) the short-circuited short piece 8a when the terminal cover 103 is disposed at the first position. FIG. 16 shows a positional relationship between the protrusion 103b and the short-circuit piece 8a (in a non-short-circuit state). As shown in FIG. 16, when the short-circuit piece 8a is in a non-short-circuit state, the protrusion 103b is accommodated in the gap between the secondary output parts 8 having the same polarity, so that the terminal cover 103 interferes with the short-circuit piece 8a. Without being fixed to the main body 4.
That is, in the present embodiment, the instrument replacement work without a power failure is performed according to the following procedure.
(1) Remove the screw 103a from the screw hole 46 and remove the terminal cover 103 at the first position from the main body 4.
(2) The terminal cover 103 is turned upside down, placed on the main body 4 at the second position, and fixed with screws 103a.
(3) The secondary output part 8 of the current transformer 3 is short-circuited by the short-circuit piece 8a.
(4) Replace the meter 2.
(5) Cancel the short circuit state of the short circuit piece 8a.
(6) The terminal cover 103 at the second position is removed from the main body 4, inverted in the vertical direction, and fixed to the main body 4 at the first position.

  The present invention is applied to a stationary terminal used in a meter with a transformer used in combination with a current transformer or a transformer for a meter such as a watt hour meter.

DESCRIPTION OF SYMBOLS 1 Current transformer built-in stationary terminal 2 Instrument 2a Instrument terminal part 3 Current transformer 4 Stationary terminal main body 4a Primary connection part 4b Secondary connection part 5 Distribution line 6 Crimp terminal 7 Primary terminal 7a Screw hole 7b Base end part 7c Tip part 8 Secondary output part 8a of current transformer 9 Short terminal 9 Bar terminal 9a Crimp part 9b Bar part 10 Fixing tool 11 Conductor 12 Lead wire 40 Bulkhead 41, 42 Side wall 43 Rear wall 44 Bulkhead 45 Lower wall 46 Screw hole 47a, 47b Mounting hole 48 Front wall 48a Notch 48b Sealing hole 49 Rear wall 49a Curved groove 50 Holding part 50a Rear wall 50b Side wall 100 First part 100a of fixing tool 100a Opening part 100b Upper wall 100c Front wall 100d Rear wall 100e Side wall 100f Fixing tool accommodation Part 100g Partition 100h Notch 100i Opening 100j Opening 101 Second part 101a of fixing tool Upper wall 101b Side wall 101c Partition 102 Upper part Bar 102a Opening 102b Protrusion 102c Sealing hole 102d Side wall 102e Holder 103 Terminal cover 103a Terminal cover mounting screw 103b Protrusion

Claims (8)

A stationary terminal with a built-in current transformer, which is provided with a body incorporating a current transformer and is connected between a meter and a distribution line,
A bar terminal as a secondary terminal connected to the instrument;
A fixture for fixing the bar terminals so that the bar terminals are arranged in a horizontal row with respect to the main body at a predetermined pitch;
A stationary terminal with a built-in current transformer. A stationary terminal with a built-in current transformer according to claim 1,
A primary terminal having a proximal end connected to the distribution line and a distal end protruding through a through hole of the current transformer;
An upper cover covering the tip of the primary terminal;
With
The upper cover has an opening that exposes the bar terminal to the outside, and the opening is dimensioned so that the fixture is movable within the opening. . A stationary terminal with a built-in current transformer according to claim 2,
A terminal cover that is attached to the front surface of the main body so as to cover at least a base end portion of the primary terminal, and the terminal cover has a first position that covers the entire front surface of the main body and the first position; A stationary terminal with a built-in current transformer that is used in a state of being attached to the main body at one of the second positions inverted in the vertical direction. A stationary terminal with a built-in current transformer according to claim 3,
The terminal cover covers both the base end portion of the primary terminal and the secondary output portion of the current transformer in the first position, and the base end portion of the primary terminal and the current transformer in the second position. A stationary terminal with a built-in current transformer that exposes only the secondary output section of the current transformer among the secondary output sections of the transformer. A stationary terminal with a built-in current transformer according to claim 4,
Comprising a short-circuit device for short-circuiting the secondary output of the current transformer;
The said terminal cover is a stationary terminal with a built-in current transformer provided with the protrusion in the position which interferes with the said short circuit apparatus in a short circuit state.   It is a stationary terminal with a built-in current transformer of Claim 2, Comprising: The said upper cover is a stationary terminal with a built-in current transformer which has the protrusion for fixing which fixes the said current transformer within the said main body.   3. The stationary terminal with a built-in current transformer according to claim 2, wherein a holder portion for receiving a test seal slip of the current transformer is formed on at least one of the upper cover and the main body. Stationary terminal.   It is a stationary terminal with a built-in current transformer as described in any one of Claims 2-7, Comprising: The said primary terminal is a plate-type terminal extended linearly, The stationary terminal with a built-in current transformer.

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