JPS6218915A - Low pressure drawer box with bypass terminal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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.

In the case of a short-circuit accident at a certain point on conventional high-voltage distribution lines, or construction work such as re-stretching high-voltage cables or replacing high-voltage connections in a specified section, the low-voltage service box in a certain section including the accident or construction site must be repaired or constructed. Power is not applied during this period. As a result, customers were left without power outages during this period. 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-mentioned section, and thereby power is supplied to customers in the accident or construction section.

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

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 refers to the main body of the draw-in box, 2 refers to doors that cover the openings bored on both sides of the draw-in box main body 1 so that they can be opened and closed freely, and 3.4.5.6 respectively are installed inside the draw-in box main body 1 with a space between them. U-phase, ■-phase, W-phase, and N-phase vertical busbars stand vertically in parallel, and the upper ends of each vertical busbar 3.4.5.6 are horizontally bent terminal blocks 3a, 4a, and 5a, respectively. .

6a. Also, each of these vertical busbars 3.4
．． Compression connectors 7.8.9.10 are connected to the lower ends of 5.6 and 7.8.9.10, respectively, for compressively connecting the incoming cable and the outgoing cable. 111' 12.13.14 are U-phase, ■-phase, W-phase, and N-phase horizontal busbars 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, and 14 is a bent portion 11a with both ends thereof bent into a keyboard.

12a, 13a, and 14a. 15.
16, 17, and 18 are in-phase vertical busbar 3 and horizontal busbar 11, vertical busbar 4 and horizontal busbar straddle, vertical busbar 5 and horizontal busbar u1, vertical busbar 6 and horizontal busbar 13, respectively.
These connecting bus bars 15, 16, 17, and 18 are also provided in two sets, upper and lower.

Reference numeral 19 indicates each fuse holder connected to the bent portions 11a, 12m, and 13a at both ends of each horizontal bus bar 11, 12, and 13, respectively. Each short-circuiting bus bar 21 is each branch terminal electrically connected to each of these fuse holders 19 or one end of each short-circuiting bus bar addition, and each of these horizontal bus bars 11, 12, 13, 14 of each phase and each fuse holder 19 Alternatively, the shorting busbar I and the branch terminal 21 form a U-shape, and each fuse holder 19 or the shorting busbar I and each branching terminal lull face the openings on both sides of the lead-in box body 1. n is the adjacent fuse holder 19 of each phase
Or a branch terminal barrier that shields the short circuit bus bar addition and branch terminal 21, B is the above compression connector 7.8.9.10
Each cable insertion hole provided in the bottom plate (lower side plate) lb of each lower drop-in box main body 1, and a large number of branch line bushings provided on the outer surface of the rear plate IC of the lead-in box main body 1, each of these branch line bushings Sae is the rear plate 1 corresponding to each of the above branch terminals.
Provided at each hole drilled in c.

Reference numeral 5 denotes a number of support holders for holding each branch line end introduced from the branch line bushing into the service box body 1, and the core wire of each branch line end supported by each of these support holders 5 is connected to each of the above-mentioned branch terminals. 21. Reference numerals 26 and 27 denote upper and lower mounting brackets respectively provided on the upper and lower rear side plate ICs of the draw-in box main body 1. Public, 4, Canada, 31 are each of the above terminal blocks 3m, 4a, 5a.

Bypass terminals for connecting bypass wires are provided on the cylindrical body 6a, and each terminal row, container (material), 31 is a cylindrical body with a number of contact pieces arranged at intervals on the outer periphery of the cylindrical body. It consists of an elastic ring wrapped around the outer periphery of a large number of contact pieces protruding from the terminal block 3a, 4a, 5.
a, protrusions 3b provided on 6a, 14b, 5b, 6b
It is crowned and fixed. Reference numeral 32 denotes bypass terminals 28, 29, 30, and 31 located above each of these bypass terminals 28, 29, 30, and 31, respectively, provided on the periphery of the opening bored in the top plate (upper plate) 1d of the draw-in box main body 1, and projected from the top surface of the top plate 1d. Each of the above-mentioned bypass terminal paths (4) (9) is provided in each of these cylinders (32).
The upper end of 31 is protruding. Reference numeral U denotes a fixed base provided approximately at the center of the upper surface of the top plate 1d, and this fixed base is higher than each of the cylinders 32.

A is a bottomless box-shaped lid, and the space between the lids is placed on the top plate 1d of the draw-in box body 1 to cover each of the cylinders 32 mentioned above. A ventilation notch provided at the center lower edge of each side of Akeko's lid body.
Reference numeral 37 denotes a fixing screw passing through the approximate center of the lid, which can be screwed into a screw hole provided in the fixing tool when the lid is placed on the top plate 1d of the draw-in box main body 1. A is a bypass lid that has almost the same shape as the lid, 39 is a hole bored in the upper surface between these lids, 4° is an annular protrusion erected around the periphery of this hole 39, 4
1 is the N phase (ground phase) bypass line, and this bypass line 4
A compression terminal 42 is compressed and connected to the core wire from which the coating at one end has been peeled off. 43 is a collar provided on the outer periphery of this compression terminal 42;
The compression terminal 42 is inserted into the hole 39 of the bypass lid body, and with the collar 43 in contact with the periphery of the hole 39, the compression terminal 42 protruding from the underside of the lid 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 4 when the lid is placed on the top plate 1d of the draw-in box main body 1. 46 indicates that when this bypass cover part is placed on the top plate 1d of the lead-in box main body 1, the cover part 46 is located above each of the bypass terminals 28, 30, and 31 of the U phase, ■ phase, and W phase. Holes 47 are annular protrusions protruding from the upper surface between the lids at the periphery of the name tag 46, and each of the annular protrusions 47 is threaded on its inner periphery. Hammer is U
A compression terminal 49 is connected to the core wire of each of the bypass wires of the phase, ■ phase, and W phase (however, the V phase and W phase are not shown), with the sheath removed from the end of each bypass 11!48. . The blade is a collar provided on the outer periphery of this compression terminal 49, and 51 is a fixed tube that is slidably crowned on the outer periphery of this bypass wire 48 and has a screw on the lower outer periphery. It is inserted into the hole 46, the flange is brought into contact with the outer periphery of the hole 46, and then screwed onto the inner circumferential screw of the annular protrusion 47 to hold down the flange. 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 ll1141 and each of the other-phase bypass lines 48, and the lower ends of each of these insulating cars 1141 and 52 are as shown in FIG. The outer periphery of each annular protrusion 40 or 47 can be freely covered.

In this embodiment, if the section including the interior of the low-voltage service box is not energized due to an accident or construction, no electricity will flow from the service cable to the vertical busbars 3.4.5.6 of each phase. Then, 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 lid of the low-voltage lead-in box main body 1 is tightened with the fixing screw 37. Loosen it, remove it, and bypass the ground phase instead $34
Place the bypass lid body to which the compression terminal 42 of No. 1 is fixed on the top plate 1d of the box body 1, screw the fixing screw into the screw hole of the fixed line, and place the lid body on the top plate 1d. Fix it. As a result, the ground phase compression terminal 42 is automatically connected to the ground phase bypass terminal 4 in the box body 1, as shown in FIG. After that, connect the compression terminals 49 at each end of each bypass wire of each of the U-phase, ■-phase, and W-phase from the name plate 46 for each phase to the bypass lid until the brim hits the periphery of the hole 46. Insert inside. As a result, each compression terminal 49 is connected to the bypass terminal 28 of the same phase.
．． Connect to 30 and 31 respectively. Each compression terminal 49 is fixed to the bypass lid body by screwing each fixing tube 51 onto the inner circumferential thread of each annular protrusion 47. Thereafter, each nuchal-like protrusion 47 and fixed tube 51 are covered with each insulating cover 52.

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 busbars 15 in the low-voltage lead-in box main body 1 are energized. .16.17.18, each horizontal busbar 11
．． 12.13.14, the branch line is energized via each catch holder 19 or short-circuit busbar and each branch terminal 21, and is supplied to each customer.

In addition, when repair or construction work for the above-mentioned accident is completed, first remove the insulating cover 52 of the U-phase,
9 from the bypass terminal row, (9), 31 and the bypass cover, then remove the bypass cover from the fixing screw 37.
Loosen and remove. As a result, the compression terminal 42 of the ground phase bypass wire 41 is also removed from the ground phase bypass terminal 4 of the box body 1. After that, the lid body A is placed on the top plate 1d of the box body L 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.

Further, in the above embodiment, a bypass cover wing is separately provided, and the bypass cover wing is preliminarily attached to the bypass 1i of the ground phase.
When the compression terminal (male type) 42 of 141 is penetrated and fixed, and the bypass cover body 1 is covered with the lead-in box body 1, the bypass terminal (for connecting the bypass line of the ground phase in the box body 1) is automatically inserted.
Since the compression terminal 42 is connected to the female type (2g), it is connected before the other phases. In addition, when removing the bypass wire, since the compression terminal of the ground phase is fixed to the bypass cover body, remove the bypass line 48 of the other phase from the bypass cover body, and then remove the bypass cover wing. Only then will the compression terminal 42 of the ground phase bypass line 41 come off.

Therefore, when connecting or disconnecting the bypass line, the operator must connect the bypass fi 41 of the ground phase to the bypass line 4 of the phase other than the ground phase.
8, and the bypass m48 of phases other than the ground phase is connected to the bypass line 41 of the ground phase.
be forced to remove it before its removal. 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 the drawing]

Fig. 7 is a partially sectional side view of the present invention, Fig. 2 is a partially sectional rear view, Fig. 3 is a partially sectional plan view, Fig. 5 is a plan view, and Fig. 5 is a retractable box of the present invention. An explanatory diagram of the structure of the bus bar inside the main body, FIG. 6 is a plan view of the main body of the lead-in box of the present invention with the lid removed, and FIG. 7 is a diagram showing the process of connecting a bypass line to the main body of the lead-in box of the present invention. Figure 1 is a partial cross-sectional view showing a state in which a 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 is the vertical busbar, A, 4, sides, 31 is the bypass terminal for each phase, 32 is the cylinder, A is the hole, and the fixture is the fixing base. is the lid body, 37 is the fixing screw,
A: Bypass lid, 39: hole, 41: N phase (ground phase)
42 is a compression terminal, 46 is a hole, 48 is an N-phase extra bypass wire, 49 is a compression terminal, and 51 is a fixed tube.

Claims (2)

[Claims] (1) In the main body of the low-voltage drop-in box, terminals for connecting the bypass wires of each phase are electrically connected to the bus bars of each phase that are connected to the drop-in cables of each phase, and the box is opposite to each of these terminals. A low-voltage draw-in box with a bypass terminal, characterized in that an opening is provided in the side plate of the main body, and a removable lid is provided in the opening. (2) Provide female terminals for connecting the bypass wires of each phase that are electrically connected to the busbars of each phase that are connected to the incoming cables of each phase in the low-voltage drop-in box body, and An opening is provided in the side plate of the box body facing the , a removable lid is provided in this opening, and a male terminal at the end of the bypass wire of the ground phase is fixed through the bypass lid provided separately from the lid. However, 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 the end of the bypass wire of the other phase is A low-voltage lead-in box with a bypass terminal, characterized in that each male terminal is provided so as to be able to pass through the bypass lid and come into contact with a female terminal for bypass wires of each phase in the box body.