JP4831508B2 - Deferred terminal block and uninterruptible instrument replacement work method and transmission stoppage work method - Google Patents

Description

  The present invention relates to a configuration of a stationary terminal block used for uninterruptible replacement work of power distribution equipment such as a watt-hour meter, an uninterruptible instrument replacement work method using the stationary terminal block, and a transmission / disconnection work method.

  When replacing a meter such as a watt hour meter provided at the receiving end, an uninterruptible construction without stopping the power supply is required. Taking the watt hour meter as an example, the four main methods in uninterruptible replacement work will be described below.

  The first method is a method in which an electric wire is connected to a stationary terminal without connecting the electric wire directly to the instrument terminal, and the instrument is inserted and connected to a bar terminal of the stationary terminal. When replacing the instrument, replacement is performed by attaching a bypass tool to the stationary terminal and continuing power supply while removing the existing instrument from the stationary terminal and attaching a new instrument to the stationary terminal (for example, Patent Document 1). reference)

  In the second method, as shown in FIG. 10, a crimp terminal 21 having two holes is attached to the electric wire 20, and is connected to the stationary terminal 1 ′ through one hole 22A by a screw, and the instrument is connected through the other hole 22B. 3 is connected. When replacing the meter 3, the in-phase wire is connected by a bypass line with a screw on the stationary terminal 1 'side, and the power is continuously supplied to the load side. The meter 3 is released from the crimp terminal 21 and removed, and replaced with a new meter. It is a method to do.

  The third method is a method in which an uninterruptible tool is attached in a form that sandwiches an electric wire, an in-phase electric wire is bypassed, and the instrument is replaced while power feeding is continued (see, for example, Patent Document 2).

  The fourth method is a method in which an uninterruptible tool (open / close tool) having a switch is attached to an in-phase electric wire, and the instrument is exchanged while the switch is connected and the in-phase electric wire is bypassed to continue feeding. (For example, see Patent Document 3)

  However, each of the above methods has the following problems. The first method has a problem that usable instruments are limited. That is, in the first method, since the mobility of the bar terminal connecting the instrument of the stationary terminal is small, it cannot correspond to the position of the wire hole of the instrument terminal of all models, and the stationary terminal corresponding to the instrument in advance. Cannot be exchanged for instruments with different wire hole positions. Moreover, since the terminal metal fitting which connects an electric wire, and the bar terminal which connects an instrument are integrated, when a thick electric wire is connected, the mobility of a bar terminal is lost from the hardness.

  The second method has a restriction that it can be used only for an instrument that supports a two-hole crimp terminal and cannot be used for other instruments.

The third method is not flexible when the electric wire is thick, and it is difficult to arrange the electric wire through an uninterruptible tool. Moreover, since the tool of the 3rd method and the 4th method breaks the coating | cover of an electric wire and connects it to a core wire, there exists a problem that a hole opens in the insulation coating | cover of the electric wire after construction. Furthermore, in the third method and the fourth method, when the instrument is replaced, the tip of the electric wire from which the instrument has been removed is in an unstable state, so there is a risk of contact with other electric wires. Special care must be taken not to wake up.
Japanese Patent Laid-Open No. 7-248343 JP-A-7-287032 JP 2001-165960 A

  In view of the above problems, the present invention provides a terminal block that can be used for a meter having different wire hole intervals in a stationary terminal block having a bar terminal, and is easy to perform when removing and attaching the meter. It is an object of the present invention to provide a terminal block that can prevent a short circuit caused by an outer container of a meter at the time of mounting.

  In order to solve the above-mentioned problems, the present invention provides a terminal fitting for connecting electric wires and a power distribution device (in a deferred terminal block used when performing uninterruptible replacement work for a power distribution device or carrying out a transmission / reception on a load side) The bar terminal to which the measuring instrument is connected is separated, the terminal metal fitting and the bar terminal are connected by a flexible conductor, and the bar terminal is flexible, thereby providing flexibility in the position and orientation of the bar terminal. It was possible to correspond to the position of the wire hole of various power distribution equipment. As a result, the workability and safety of the uninterruptible replacement work for the instrument can be improved.

That is, the present invention includes a resin terminal block space formed therein, and the terminal fitting which wire is connected, a rod terminal instrument is connected, a rod terminal fixture for fixing the rod terminals, the In a stationary terminal block having a base and a frame forming a space for supporting a bar terminal fixture , the terminal fitting and the bar terminal are connected by a flexible conductor having a softness that does not restrict the movement of the bar terminal. The bar terminal fixture is disposed in the space formed by the base and the frame so as to be movable to the left and right, and the base and the frame for fixing the bar terminal fixture are front and rear in the resin terminal block. movably received in the terminal fitting is inserted into the terminal fitting insertion groove in space with a bypass window provided on a front face of the resin terminal block. Furthermore, the present invention is the stationary terminal block, the base and the frame for supporting the rod terminal fixture is biased forward by a spring mechanism in the vicinity of an upper end portion of the resin terminal block, said bar terminal An insulating cap is attached to the tip of the terminal, the terminal metal fitting is arranged in the front direction, the bar terminal fixture is arranged in the rear direction, and the terminal metal fitting and the bar terminal fixture are stacked in the front-rear direction. Further, according to the present invention, in the stationary terminal block, a screw hole for connecting to a bypass tool is provided on the front surface of the terminal fitting.

  In the uninterruptible instrument replacement construction method using the stationary terminal block, the present invention performs uninterruptible instrument replacement while fixing the bypass tool to the screw hole and short-circuiting the same-phase electric wire. I did it. Further, according to the present invention, in the above-mentioned method of sending and stopping work using the stationary terminal block, the instrument is installed while the open / close tool provided with the bypass means and the switch is screwed and fixed to the screw hole and the common phase is short-circuited. The load side bar terminal was insulated, the instrument was returned, the switch was opened, and the load side was stopped.

  ADVANTAGE OF THE INVENTION According to this invention, the stationary terminal block corresponding to the position of the electric wire hole of various electric power distribution apparatuses can be provided, and work can be performed easily and safely. Moreover, the terminal block of the shape suitable for the installation environment of a meter can be provided.

  Hereinafter, the structure of the stationary terminal block according to the present invention will be described with reference to the drawings. The present invention is based on the first method of the prior art, and improves the versatility of existing instruments and improves workability and safety. According to the present invention, in the stationary terminal block of the first method, the integrated terminal fitting and the bar terminal are separated, and a flexible conductor is connected between them.

1 is an external perspective view of a stationary terminal block to which a single-phase three-wire type or three-phase three-wire watt hour meter is connected, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a front view, FIG. 4 is a plan view, FIG. 5 is a left side view, and FIG. 6 is a front view illustrating a state in which a watt hour meter is attached to the terminal block. 1 and 2, the up and down direction direction connecting the right upper side and the lower left side, the left and right direction direction connecting the left upper and lower right side, the direction connecting the left side and the right side represents the front-rear direction Yes. That is, in FIGS. 1 and 2, the surface on which the bar terminal 141 is provided is the upper surface, and the surface on which the bypass window 111 is provided is the front surface.

  As shown in the figure, a stationary connection base 1 according to the present invention accommodates a plurality of (six in this example) terminal fittings 13 and a plurality of bar terminals 141 to which electric wires are connected, inside a terminal block 11. The upper opening is covered with a cover 12.

  The terminal block 11 is made of a flame-retardant and strong resin (which may be thermosetting or thermoplastic), and includes a plurality of bypass windows 111, a plurality of terminal fitting insertion grooves 112, and one base insertion. A hole 113 is provided. The terminal fitting insertion groove 112 is open at the rear and is integrated with the base insertion hole 113, and a bypass window 111 is opened at the front thereof. The terminal fittings 13 are inserted into the terminal fitting insertion grooves 112, respectively.

  The terminal block 11 is assembled with an assembly such as a terminal fitting 13 and a bar terminal fixture 14. The terminal symbols are 1S, 2S, 3S, 3L, 2L, and 1L JIS layouts from the left.

  The cover 12 is made of a flame-retardant and strong resin (which may be thermosetting or thermoplastic), is a terminal block cover, and also serves to fix each assembly.

  The terminal fitting 13 is made of copper or a copper alloy, and two terminal screw holes 131 are formed below the front surface, and a bypass screw hole 132 is formed above. Further, the lower surface of the terminal fitting 13 is provided with an electric wire insertion hole (not shown) directed upward, and a screw hole (not shown) in which the terminal 151 of the flexible conductor 15 is screwed is provided on the rear surface. Is provided. For example, one terminal 151 of the flexible conductor 15 is screwed to the rear surface of the terminal fitting 13, and the electric wire inserted from the lower surface opening is fastened and fixed by the two terminal screws 133.

  The bar terminal fixture 14 is made of an insulating synthetic resin, and prevents rotation about the central axis of the bar terminal 141. The plurality of bar terminal fixtures 14 are supported by being spaced from each other by being sandwiched between spaces formed by the base 16 and the frame 17. The bar terminal fixture 14 is fixed in the vertical direction and movable in the horizontal direction in spaces formed by fastening the base 16 and the frame 17 with screws 18 respectively. Furthermore, the assembly of the bar terminal fixture 14 sandwiched between the base 16 and the frame 17 is accommodated in the base insertion hole 113 so as to be movable in the front-rear direction. Therefore, each bar terminal 141 can move back and forth and right and left corresponding to the position of the electric wire hole of the instrument.

  The bar terminal 141 is made of a machined electrical annealed copper wire or the like, and is connected to an instrument terminal.

  An insulating cap 142 made of an insulating synthetic resin is provided at the tip of the bar terminal 141 to prevent contact with, for example, a conductor on the back surface made of metal of the instrument terminal portion.

  The flexible conductor 15 is composed of a soft copper stranded wire or the like having a softness that does not restrict the movement of the bar terminal, and both ends are joined by a bonding method with good electrical connection to the terminal fitting 13 and the bar terminal 141. It is fixed. The terminal fitting 13, the bar terminal 141, and the flexible conductor 15 are connected and fixed by a connection method such as screw fixing or rivet caulking through a copper terminal.

  The other end of the flexible conductor 15 is connected to a bar terminal 141 molded on the bar terminal fixture 14 by brazing or caulking. The flexible conductor 15 is made of a soft material that does not restrict the movement of the bar terminal 141 such as a stranded copper wire, and the terminal 151 is connected to one end by a connection method with good electrical connection. .

  The assembly of the bar terminal fixture 14 sandwiched between the base 16 and the frame 17 is hereinafter referred to as an assembly. The assembly is rotated in the front-rear direction by a spring mechanism. When no force is applied from the outside, in the above assembly, the tip of the bar terminal 141 is inclined forward, and when a force is applied to the bar terminal 141 from the front to the rear, the tip of the bar terminal 141 is Look up.

  The base 16 has a function of collecting a plurality of bar terminal fixtures 14 and is formed of a synthetic resin having an insulating property.

  The frame 17 is made of a material having a rigidity that does not bend such as iron, stainless steel, and synthetic resin. The assembly of the bar terminal fixture 14 is sandwiched between the base 16 and the pair, and the bar terminal fixture 14 is movable only to the left and right. Have a function to make.

  The terminal fitting 13 and the assembly are inserted into the terminal fitting insertion groove 112 and the base insertion hole 113, respectively.

  A spring 19 having a spring function such as a coil spring or a leaf spring is provided at the screwing portion of the assembly so that the upper ends of the base 16 and the frame 17 are flipped forward and the tip of the bar terminal 141 is tilted forward. Since this spring is provided with a portion for pushing the assembly forward, the bar terminal 141 can be tilted forward. Further, the spring 19 can be omitted by making the flexible conductor 15 long enough to have a spring function.

  The spring 19 has a function of flipping the base 16 forward and tilting the tip of the bar terminal 141 forward. Since the point pushed by the spring 19 is arranged in the upward direction, the bar terminal 141 is likely to jump up. Here, a cylindrical coil spring is taken as an example. However, any one having a spring mechanism such as a leaf spring may be used. Further, the spring 19 may be an integral spring mechanism molded on the base 16 or the frame 17 itself. Furthermore, it is possible to eliminate the spring depending on the length of the flexible conductor.

  After the terminal fitting 13 and the assembly are inserted into the terminal fitting insertion groove 112 and the base insertion hole 113, respectively, the upper surface opening is covered with the cover 12, and the stationary terminal block 1 is assembled. The terminal screw 133 is inserted and fixed in the terminal screw hole 131 of the terminal fitting 13 to complete the stationary terminal block 1.

  In the stationary terminal block 1 according to the present invention, the terminal fitting 13 is disposed on the front side, and the bar terminal fixture 14 and the bar terminal 141 are disposed on the rear side. The terminal fitting 13 and the bar terminal 141 are connected by a flexible conductor 15. The terminal fitting 13 is fixed to the terminal block 11, and the bar terminal fixture 14 is movable. The bar terminal fixture 14 can be moved back and forth and left and right, and the tip of the bar terminal 141 can be rotated back and forth. Configured.

  In the stationary terminal block 1 configured as described above, the bar terminal 141 is inclined forward by the action of the spring 19 as shown in FIGS. Furthermore, the front surface of the terminal fitting 13 is exposed in the bypass window 111, facilitating the wire connection work when installing the stationary terminal block 1, and facilitating the installation of the bypass tool when replacing the instrument. Yes.

  FIG. 6 shows a state in which the meter 3 is attached to the stationary terminal block 1. In this figure, the terminal part of the stationary terminal block 1 and the terminal cover of the terminal part 31 of the meter 3 are shown removed. Usually, each terminal part is covered with a terminal cover to protect the terminal part. is doing. An electric wire 20 is inserted into the terminal fitting 13 of the stationary terminal block 1 from below, and is fastened and fixed with a terminal screw 133.

  In addition, since the stationary terminal block 1 separates the terminal fitting 13 and the bar terminal 141 and is connected with the flexible conductor 15 between them, the flexible conductor 15 and the connecting portion thereof are added. The shape becomes larger. However, in this invention, it can be set as the shape which does not have trouble on installation environment by setting it as the structure which arrange | positions the terminal metal fitting 13 in the front direction, and arrange | positions the rod terminal 141 in the back direction and overlaps in the front-back direction. In the installation environment of the instrument 3, there are cases where there are restrictions in the vertical direction, such as when wiring from the wall or when it is placed in the measurement box, but there is a relative margin in the front-rear direction. If the thickness of the terminal block 1 in the front-rear direction is equal to or lower than that of the meter 3, it can be accommodated in a measuring instrument box. Therefore, it is possible to cope with these installation environments by maintaining the conventional dimensions in the vertical direction and making the shape long in the front-rear direction.

  The case where an uninterruptible construction is performed using a bypass tool at the time of instrument replacement will be described with reference to FIGS. 7 and 8. FIG. 7 is an external perspective view for explaining the shapes of the stationary terminal block 1 and the bypass tool 5, and FIG. 8 is a wiring diagram for explaining a bypass state by the bypass tool 5. In the figure, the power supply connections 1S, 2S, 3S and the load connections 1L, 2L, 3L are connected to each other by a short-circuit conductor 51 to bypass the instrument.

  The bypass tool 5 has a main body formed of an electrically insulating material, a plurality of short-circuit conductors 51 that mutually short-circuit the power supply connection and the load connection in-phase, and stationary terminals provided at both ends of each short-circuit conductor 51. A connection screw 52 that is screwed into a bypass screw hole 132 provided in the terminal fitting 13 of the terminal block 1 is provided so as not to fall off, and a hole 53 for attaching a clamp-type ammeter for current measurement to the short-circuit conductor 51 is further provided. Is provided. Furthermore, the guard 54 extended below is provided in the lower both side edge part by the side in which the connection screw 52 of the bypass tool 5 is provided. The guard 54 is for preventing the connection screw 52 from coming into contact with the adjacent terminal fitting 13 or the terminal screw 133 when the bypass tool 5 is attached or removed, and prevents erroneous connection. H is formed longer than the connection screw 52.

  A screw hole 132 for connecting to the bypass tool 5 is provided on the front surface of the terminal fitting 13. The connection screw 52 used here is attached to the bypass tool 5 side and has a structure that does not come off in consideration of workability. When the connection screw is attached to the stationary terminal block 1 side, an extra space is required when the connection piece of the bypass tool 5 is sandwiched with the screw. However, when the connection screw 52 is attached to the bypass tool 5 side, this space is This eliminates the need for downsizing of the stationary terminal block 1 and leads to weight reduction and cost reduction of the stationary terminal block 1.

  When performing uninterruptible replacement work for the instrument, remove the terminal cover (not shown) for the stationary terminal block 1, attach the bypass tool 5 to the terminal fitting 13 of the stationary terminal block 1, and short-circuit the wires of the same phase. Replace the instrument without power interruption. The conventional bypass tool 5 represents the connection state with the stationary terminal block 1 by an electrical display or the like. However, in such a structure, even if the connection is sufficient, it does not react when the load current is small. There was a fear.

  In this invention, it can be set as the structure which can grasp | ascertain a more reliable connection state by providing the hole 53 for attaching a clamp type ammeter to the bypass tool 5 in each phase, and comparing with the electric current value of a power supply side electric wire. .

  An example in which the opening / closing tool 7 is attached instead of the bypass tool 5 will be described with reference to FIG. In this example, by attaching the opening / closing tool 7, the load side sending / stopping solution is possible. As with the bypass tool 5, the screw for connecting to the stationary terminal block 1 is attached to the opening / closing tool 7 side so as not to be detached. When stopping the power transmission on the load side, the terminal cover for the stationary terminal block 1 is removed, the open / close tool 7 is attached to the stationary terminal block 1, and the instrument is removed while the in-phase is short-circuited by the open / close switch 71. An insulating cap (not shown) is attached to the load-side bar terminal 141, and the removed instrument is reinserted and connected. Thereafter, each phase is simultaneously opened by the open / close switch 71, and power transmission can be safely stopped even in the case of a three-phase connection. Even in this state of sending and stopping, since power is supplied to the instrument, in the case of an electronic instrument, it can be maintained for a long period of time without resetting the set value or the measured value. In the case of power recovery, the reverse procedure can be used.

  In the above example, the case of the single-phase three-wire type and the three-phase three-wire type has been described, but the configuration is the same in the case of the single-phase two-wire type, but the terminal fitting 13, the flexible conductor 15, the rod terminal The number of the fixtures 14, the bar terminals 141, and the insulating caps 142 is 6 to 4, respectively.

The present invention having the above-described configuration can improve the following three points.
(A) The rod terminal 141 is provided with mobility, and corresponds to the positions of electric wire holes of various instruments. The wire holes of the instrument have the same position in the front-rear direction in one instrument, and accordingly, the front-and-rear direction of the bar terminal moves together, and the left-right direction moves individually. This makes it easier to insert the instrument into the bar terminal.
(B) As a structure in which the tip of the bar terminal 141 is movable upward from the front direction, the instrument 3 can be easily inserted into the bar terminal 141, and the structure is excellent in workability. The terminal fitting 13 is fixed in the vertical direction as before, and the bar terminal 141 is movable from the front to the top using a spring mechanism. The tip of the bar terminal 141 falls forward when no force is applied from the outside, and when the instrument is inserted into the bar terminal and hung on the wall, it is turned upward by the stress. Since the conventional bar terminal is always fixed in the upward direction, it may be difficult to insert it into the bar terminal, for example, the instrument touches the wall surface, but the instrument can be easily inserted by tilting the tip of the bar terminal forward. .
(C) An insulating cap is attached to the tip of the bar terminal so that the back surface (painted on the metal surface) of the instrument terminal part is difficult to contact, thereby improving safety. The conventional bar terminal is always facing upward, and when the meter is attached, the back surface of the meter terminal portion may come into contact with all the front surfaces of the bar terminal. However, by improving the second point, the contact point on the back of the instrument terminal is almost limited to the tip of the bar terminal if the contact is light, by tilting the tip of the bar terminal forward. The possibility of a short circuit is reduced by attaching an insulating cap.

The perspective view explaining the external appearance shape of the stationary terminal block concerning this invention The disassembled perspective view explaining the structure of the stationary terminal block concerning this invention The front view explaining the external shape of the stationary terminal block concerning this invention The top view explaining the external appearance shape of the stationary terminal block concerning this invention The left view explaining the external shape of the stationary terminal block concerning this invention The front view explaining the state which attached the meter to the stationary terminal block concerning this invention The perspective view explaining the state which attached the bypass tool to the stationary terminal block concerning this invention The wiring diagram explaining the state which attached the bypass tool to the stationary terminal block concerning this invention Wiring diagram explaining a state in which an opening / closing tool is attached to a stationary terminal block according to the present invention Front view explaining a state in which a meter is attached to a terminal block using a conventional 2-hole crimp terminal

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Stationary terminal block, 11 ... Terminal block, 111 ... Bypass window, 112 ... Terminal metal fitting insertion groove, 113 ... Base insertion hole, 12 ... Cover, 13 ... Terminal metal fitting, 131 ... Terminal screw hole, 132 ... Bypass screw Hole: 14 ... Bar terminal fixture, 141 ... Bar terminal, 142 ... Insulation cap, 15 ... Flexible conductor, 151 ... Terminal, 16 ... Base, 17 ... Frame, 18 ... Connection screw, 19 ... Spring, 20 ... Electric wire DESCRIPTION OF SYMBOLS 3 ... Instrument, 31 ... Terminal part, 5 ... Bypass tool, 51 ... Short-circuit conductor, 52 ... Connection screw, 53 ... Ammeter hole, 54 ... Guard, 7 ... Open / close tool, 71 ... Open / close switch

Claims (7)

Supporting the resin terminal block space formed therein, and the terminal fitting which wire is connected, a rod terminal instrument is connected, a rod terminal fixture for fixing the rod terminals, the rod terminal fixture In a stationary terminal block having a base and a frame forming a space to be
The terminal fitting and the bar terminal are connected by a flexible conductor having a softness that does not restrict the movement of the bar terminal ,
The bar terminal fixtures are arranged at intervals so as to be movable left and right in the space formed by the base and the frame,
A base and a frame for supporting the rod terminal fixture are accommodated in the resin terminal block so as to be movable back and forth ,
The stationary terminal block, wherein the terminal fitting is inserted into a terminal fitting insertion groove in a space having a bypass window provided in front of the resin terminal block . The stationary terminal block according to claim 1,
A stationary terminal block , wherein a base and a frame for supporting the bar terminal fixture are biased forward by a spring mechanism in the vicinity of an upper end portion in the resin terminal block . In the stationary terminal block according to claim 1 or 2,
A stationary terminal block, wherein an insulating cap is attached to a tip of the bar terminal . The stationary terminal block according to any one of claims 1 to 3,
A stationary terminal block having a structure in which the terminal fittings are arranged in the front direction and the bar terminal fixtures are arranged in the rear direction, and the terminal fittings and the bar terminal fixtures are stacked in the front-rear direction. The stationary terminal block according to any one of claims 1 to 4,
A stationary terminal block, wherein a screw hole for connecting to a bypass tool is provided on a front surface of the terminal fitting. In the uninterruptible instrument replacement construction method using the stationary terminal block according to claim 5,
An uninterruptible instrument replacement construction method characterized in that an uninterruptible instrument exchange is performed while a bypass tool is screwed and fixed to the screw hole to short-circuit an in-phase electric wire. In the transmission and suspension work method using the stationary terminal block according to claim 5,
While opening and closing the open / close tool with bypass means and screwing in the screw hole and fixing the same phase, short the common phase, insulate the load side bar terminal, return the instrument and open the switch, A transmission / removal construction method characterized by carrying out a load / transmission settlement on the load side.

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