JPH0376090B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention provides a bypass terminal equipped with a high-voltage distribution line that allows a low-voltage bypass line from another low-voltage service box to be connected extremely easily to a low-voltage service box in these sections during an accident or construction work. Regarding low pressure draw boxes.

Conventionally, low-voltage drop-in boxes are provided at predetermined intervals on a high-voltage power distribution line, and the high-voltage power distribution line is drawn into each of these drop-in boxes via a transformer, and the drop-in line is drawn from the location to each power consumer.

In the case of a short-circuit accident at a certain point on this high-voltage distribution line, or construction work such as re-stretching the high-voltage cable or replacing high-voltage connections in a specified section, the low-voltage service box in a certain section including the accident or construction site will be repaired or repaired. There is no through current. As a result, customers in these areas were left without power. However, this power outage must be avoided as much as possible, and a bypass construction method has been developed in which a bypass line is installed on the high-voltage line in the above section, and power is supplied from the bypass line to the customer in the accident or construction area via a transformer etc. There is.

However, conventional low-voltage service boxes do not have terminals for bypass line tangents, and therefore, when drawing from the bypass line to each customer, the bypass line led out from the transformer is connected to the low-voltage main line introduced into the existing low-voltage service box. It was connected.

In this method, it was necessary to connect the bypass line to the low-voltage main line at a location close to the low-voltage service box, and after construction, it was necessary to remove the connection, which was extremely time-consuming. There was also the risk of damaging the low-voltage trunk line during the above connection.

This invention was made in view of this point, and in order to make it extremely easy to connect the bypass line to the low-voltage lead-in box in the bypass construction method, a bypass terminal is provided in advance on the low-voltage lead-in box, and when necessary, it is extremely easy to connect the bypass line to the low-voltage lead-in box.
To provide a low-voltage lead-in box that allows a bypass line to be connected reliably and safely.

Therefore, the present invention provides female terminals for connecting bypass wires of each phase that are electrically connected to the busbars of each phase that are connected to the lead-in cables of each phase in the main body of the low-voltage drop-in box. An opening is provided in the side plate of the box body facing the terminal, a removable lid is provided in this opening, and a male terminal at the end of the bypass wire of the installation phase is passed through the bypass lid provided separately from this lid. When the bypass cover is placed over the opening, the male terminal of the grounding phase contacts the female terminal for the bypass wire of the grounding phase inside the box body, and the ends of the bypass wires of the other phases are Each of the male terminals is made to penetrate through this bypass cover and come into contact with the female terminals for bypass wires of each phase inside the box body.

An embodiment of the present invention will be described below with reference to the drawings. 1 is a draw-in box body; 2 is a door that covers openings bored on both sides of the draw-in box body 1 so as to be openable and closable; 3, 4,
5 and 6 are U-phase, V-phase, and W-phase, respectively, which stand vertically in parallel with each other at intervals in the draw-in box main body 1.
Phase, N phase vertical busbars, each vertical busbar 3, 4,
The upper ends of 5 and 6 are horizontally bent terminal blocks 3a,
4a, 5a, and 6a are formed. Further, compression connectors 7, 8, 9, and 10 are connected to the lower ends of each of these vertical bus bars 3, 4, 5, and 6, respectively, for compressively connecting the incoming cable and the outgoing cable.
Reference numerals 11, 12, 13, and 14 are U-phase, V-phase, W-phase, and N-phase horizontal busbars that are arranged horizontally from top to bottom at regular intervals on the inside of the front plate 1a of the main body 1 of the pull-in box. There are two sets. Further, each of these horizontal busbars 11, 12, 13, 14 has bent portions 11a, 12 which are bent at both ends into a key shape.
a, 13a, and 14a. 15, 16,
Reference numerals 17 and 18 are connection busbars that connect the vertical busbar 3 and the horizontal busbar 11, the vertical busbar 4 and the horizontal busbar 14, the vertical busbar 5 and the horizontal busbar 12, and the vertical busbar 6 and the horizontal busbar 13, respectively, which are in phase. Connection bus bar 15, 16, 17,
18 is also provided in two sets, upper and lower. 19 are bent portions 11a at both ends of each horizontal bus bar 11, 12, 13;
Fuse holders 20 are respectively connected to ends 12a and 13a, and short circuit bus bars 20 are respectively connected to ends of bent portions 14a at both ends of each horizontal bus bar 14.
Reference numeral 1 denotes each branch terminal electrically connected to one end of each of these fuse holders 19 or each of the short circuit busbars 20, and the horizontal busbars 11, 1 of each of these phases
2, 13, 14, each fuse holder 19 or short circuit bus bar 20, and branch terminal 21 form a U-shape. facing the opening. 22 is a branch terminal barrier that shields the adjacent fuse holders 19 or shorting busbars 20 and branch terminals 21 of each phase; 23 is the bottom plate of the bottom plate 1 of the lead-in box body 1 below each of the compression connectors 7, 8, 9, and 10; (Lower side plate) Each cable insertion hole provided in 1b, 24 is a large number of branch line bushings provided on the outer surface of the rear side plate 1c of the lead-in box main body 1, and each of these branch line bushings 24 corresponds to each of the above-mentioned branch terminals 21. The holes are provided at each hole bored in the rear side plate 1c. Reference numeral 25 denotes a number of support holders for holding each branch line end introduced into the lead-in box body 1 from the branch line bushing 24, and the core wire at each branch tip supported by each of these support holders 25 is connected to each of the above-mentioned branch terminals 21. It is connected to. 2
Reference numerals 6 and 27 designate upper and lower mounting brackets provided on the upper and lower sides of the rear side plate 1c of the draw-in box main body 1, respectively. 2
8, 29, 30, 31 are each of the above terminal blocks 3a, 4
Bypass terminals for connecting bypass lines provided on a, 5a, 6a, and these terminals 28, 29,
30 and 31 each have a large number of contact pieces arranged at intervals around the outer periphery of a cylindrical body, and an elastic ring is wound around the outer periphery of a large number of contact pieces protruding from both ends of the cylindrical body.
Connect one end of each terminal to each terminal block 3a, 4a, 5a, 6
It is crowned and fixed to protrusions 3b, 4b, 5b, and 6b provided on a. 32 A tube is provided around the periphery of the opening 33 bored in the top plate (upper plate) 1d of the pull-in box main body 1 located above each of these bypass terminals 28, 29, 30, and 31, respectively, and protrudes from the top surface of the top plate 1d. The upper ends of each of the bypass terminals 28, 29, 30, and 31 protrude into each of these cylindrical bodies 32. Reference numeral 34 denotes a fixing base provided approximately at the center of the upper surface of the top plate 1d, and this fixing base 34 is higher than each of the cylinders 32. Reference numeral 35 denotes a bottomless box-shaped lid, which is placed on the top plate 1d of the draw-in box main body 1 and covers each of the cylinders 32 described above. 36 is this lid body 35
Ventilation notch provided at the center lower edge of each side, 37
is a fixing screw that passes through approximately the center of this lid body 35,
When the lid body 35 is placed on the top plate 1d of the draw-in box body 1, it can be screwed into a screw hole provided in the fixing base 34.
Reference numeral 38 denotes a bypass lid body having almost the same shape as the lid body 35, 39 a hole bored in the upper surface of this lid body 38, and 40
41 is an N-phase (grounding) bypass wire, and a compression terminal 42 is compressed and connected to the core wire from which the coating at the end of the bypass wire 41 has been peeled off. Reference numeral 43 denotes a flange provided on the outer periphery of the compression terminal 42. When the compression terminal 42 is inserted into the hole 39 of the bypass cover 38, the compression terminal protrudes from the bottom surface of the lid 38 with the flange 43 in contact with the periphery of the hole 39. 4
2 is fixed with a washer 44 and a pin 45. The compression terminal 42 is positioned so as to be inserted and clamped onto the upper end of the N-phase bypass terminal 29 when the lid 38 is placed on the top plate 1d of the draw-in box main body 1. Reference numerals 46 denote the lids 38 at respective locations located above the U-phase, V-phase, and W-phase bypass terminals 28, 30, and 31 when the bypass lids 38 are placed on the top plate 1d of the lead-in box body 1. Holes 47 are for each hole 46
These annular protrusions 47 protrude from the upper surface of the lid 38 at the periphery thereof, and each of these annular protrusions 47 is threaded on its inner periphery. Reference numeral 48 denotes bypass wires for each of the U, V, and W phases (however, the V and W phases are not shown), and a compression terminal 49 is connected to the core wire with the sheath removed from the end of each bypass wire 48. ing. 50 is this compression terminal 49
A flange 51 provided on the outer periphery of the bypass wire 48 is a fixed tube having a screw on the lower outer periphery and is slidably crowned on the outer periphery of the bypass wire 48. This fixed tube 51 is used for inserting the compression terminal 49 into the hole 46 of the lid body 38. The flange 50 is held in place by screwing the flange 50 onto the inner circumferential thread of the annular protrusion 47 from above which is in contact with the outer periphery of the hole 46 . Reference numeral 52 denotes a cylindrical insulating cover with one end tapered, which is slidably provided around the outer periphery of the N-phase bypass line 41 and each other-phase bypass line 48, and the lower end of each of these insulating covers 52 is connected to each of the above-mentioned The outer periphery of the annular projecting body 40 or 47 can be freely covered with a crown.

In this embodiment, if the section including the low-voltage drop-in box is not energized due to an accident or construction, electricity will not flow from the drop-in cable to the vertical busbars 3, 4, 5, and 6 of each phase. Therefore, the bypass wires 41 and 48 of each phase, which have one end connected to each phase of the low-voltage lead-in box that is energized elsewhere, are drawn into the low-voltage lead-in box, and the cover body 35 of the low-voltage lead-in box main body 1 is fixed with the fixing screw 3.
Loosen and remove 7, and fix the compression terminal 42 of the ground phase bypass wire 41 instead of the bypass cover 3.
8 on the top plate 1d of the box body 1, and
The fixing screw 37 is screwed into the screw hole to fix the lid 38 on the top plate 1d. As a result, the ground phase compression terminal 42 is automatically connected to the ground phase bypass terminal 29 in the box body 1, as shown in FIG. After that, the compression terminals 49 at each end of each bypass line 48 of each phase of U phase, V phase, and W phase are connected to each phase hole 46 of the bypass lid body 38 until the collar 50 hits the periphery of the hole 46. Insert into body 38. As a result, each compression terminal 49 is connected to the bypass terminals 28, 30, and 31 of the same phase, respectively. Each compression terminal 49 is fixed to the bypass cover 38 by screwing each fixing tube 51 onto the inner peripheral thread of each annular protrusion 47 . After that, each annular protrusion 47 and fixed tube 51 are attached to each insulating cover 5.
Cover with 2.

In this way, the low voltage lead-in box is energized from the low-voltage lead-in box with a healthy line via the bypass lines 41 and 48, and the vertical busbars 3, 4, 5, 6 and the connecting busbar 15 in the low-voltage lead-in box main body 1 are energized. ,16,1
7, 18, each horizontal bus bar 11, 12, 13, 1
4. Each catch holder 19 or short circuit busbar 2
0 and each branch terminal 21, the branch line is energized and supplied to each consumer.

In addition, when the repair or construction of the above accident is completed,
First, remove the insulating covers 52 of the U-phase, V-phase, and W-phase bypass wires 48 from the fixed tubes 51, etc., loosen the fixed tubes 51, and connect the compression terminals 49 to the bypass terminals 28, 3.
0, 31 and the bypass cover 38, and then remove the bypass cover 38 by loosening the fixing screw 37. As a result, the compression terminal 42 of the ground phase bypass line 41 also connects to the ground phase bypass terminal 2 of the box body 1.
It's out of 9. After that, the lid body 35 is placed on the top plate 1d of the box body 1 and fixed.

In this way, in this invention, terminals for connecting the bypass line are provided in advance in the low-voltage lead-in box, openings are provided in the side plate of the box body facing each of these terminals, and a removable lid is placed over this opening. Therefore, in the event of a power outage due to an accident or construction, the bypass wire can be drawn from another location, the lid removed and connected to the bypass wire connection terminals of each phase from outside the box, and the bypass wire can be connected during bypass construction work. It does not require any skill and can be performed extremely easily, quickly and reliably. Moreover, when unnecessary items are not needed, by covering the opening with a lid, it is safe to prevent unnecessary items from entering the main body of the draw-in box.

Furthermore, in this invention, a bypass cover is separately provided, a male terminal at the end of the bypass wire of the grounding phase is penetrated and fixed in advance to this bypass cover, and when the bypass cover is covered with the lead-in box body, the Since the male terminal is connected to the male terminal for connecting the bypass line of the ground phase inside the box body, it is connected before the other phases. In addition, when removing the bypass wire, since the male terminal of the ground phase is fixed to the bypass cover, after removing the bypass wires of other phases from the bypass cover, remove the bypass cover from the lead-in box body. Only after removing it will the male terminal of the ground phase bypass wire come off.

Therefore, when connecting or disconnecting bypass wires, workers are forced to connect the bypass wires of the grounding phase before connecting the bypass wires of the phases other than the grounding phase, and also connect the bypass wires of the phases other than the grounding phase before connecting the bypass wires of the grounding phase Forced to remove before removal of bypass wire. This makes it possible to prevent the occurrence of abnormal voltage due to the transition from ground voltage to phase-to-phase voltage, allowing bypass construction work to be performed safely.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view of the present invention, Fig. 2 is a partially sectional rear view of the same, Fig. 3 is a partially sectional plan view of the same,
FIG. 4 is a plan view of the same, FIG. 5 is an explanatory diagram of the structure of the bus bar in the pull-in box main body of the present invention, FIG. 6 is a plan view of the pull-in box main body of the present invention with the lid removed, and FIG. 7 8 is a partial cross-sectional view showing the process of connecting a bypass wire to the lead-in box main body of the present invention, and FIG. 8 is a partial cross-sectional view showing the state in which the bypass wire is connected to the lead-in box main body of the present invention. In the figure, 1 is the main body of the lead-in box, 3, 4, 5, 6 are vertical busbars, 28, 29, 30, 31 are bypass terminals for each phase, 32 is a cylinder, 33 is a hole, 34 is a fixing base, 35 is the lid, 37 is the fixing screw, 38 is the bypass lid, 39 is the hole, 41 is the N phase (ground phase) bypass wire, 42 is the compression terminal, 46 is the hole, 48 is the N
49 is a compression terminal, and 51 is a fixed tube.

Claims (1)

[Claims] 1. Provide female terminals for connecting bypass wires for each phase that are electrically connected to the busbars for each phase that are connected to the drop-in cables for each phase in the low-voltage drop-in box body, and An opening is provided in the side plate of the box body, a removable lid is provided in this opening, and a male terminal at the end of the bypass wire of the ground phase is penetrated and fixed to the bypass lid provided separately from the lid. When this bypass cover is placed over the opening, the male terminal of the grounding phase is placed in contact with the female terminal for the bypass wire of the grounding phase inside the box body, and each male terminal of the bypass wire end of the other phase is A low-voltage lead-in box with a bypass terminal, characterized in that the type terminals are provided so as to pass through the bypass lid and come into contact with the female type terminals for bypass wires of each phase in the box body.