JP3291582B2 - High-voltage power distribution path with branch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage power distribution line with a branch provided with a branch portion for branch wiring in the middle of a trunk cable.

[0002]

2. Description of the Related Art In recent years, in buildings employing a system in which advanced information communication and automatic management of the entire building are controlled by a central computer, so-called intelligent buildings (information-oriented buildings) and skyscrapers, etc., power for power supply is used. There is a demand for a large-capacity cable.

Conventionally, when building a power trunk in a building, a low-voltage cable has been used in accordance with the operating voltage (100 to 400 V class). For this purpose, for example, a 6600 V class power cable is used. 3 and 4 show examples of laying power trunks in a skyscraper. In each of these figures, reference numeral 1 denotes a main cable (high-voltage power cable), 2 denotes a connection part, 3 denotes a branch cable, 4 denotes an auxiliary transformer, 5 denotes a branch part, B denotes a completed part of a building, X denotes an unfinished part of a building, S is a wiring shaft, and W is a hanging part.

In the former example shown in FIG. 3, connecting portions 2 are attached to a plurality of locations while a trunk cable 1 is being set up along a wiring shaft S in a completed portion B of a building, and a branch cable 3 and an auxiliary transformer are connected to the connecting portions 2. In addition to branching and connecting the equipment 4, as the building construction progresses, the trunk cable 1 is newly connected above the connecting part 2 and extended to the upper floor while being laid. Several or tens of electrical works are required during the process.

In the latter example shown in FIG. 4, a plurality of branch portions 5 such as plug-in units are attached to one long trunk cable 1 at intervals, and the trunk cable 1
Is supported by the hanging portion W, and the branch portion 5
The suspension cable W is laid on each floor by connecting a branch cable 3 and the like, and the suspension portion W has a structure that supports the weight of the power cable 1 and the branch portion 5.

However, with the former wiring technique, it is necessary to repeatedly carry out electrical work for extending the trunk cable 1 in accordance with the progress of building construction, and interference with the building construction process is likely to occur. , The latter wiring technology,
Although less interference is caused by the building construction process, it is difficult to make the trunk cable compatible with the increase in power capacity after building construction.

As an improvement over the above-mentioned problems, FIG.
A high voltage power distribution line with a branch having a branch portion having an internal structure as shown in an exploded perspective view of a main part has been developed (Japanese Patent Laid-Open No.
-268331). The internal structure of the branch unit is such that a branch unit 7 is disposed between a pair of main line compression terminals 6 fixed to the main line cables 1 on both sides of the branch unit, respectively, and a main line is provided on contact surfaces 7a on both sides of the branch unit 7, respectively. The contact surface 6a of the compression terminal 6 is aligned, and the bolt 8 passed through the through hole 6b of the main compression terminal 6 is screwed into the screw hole 7 of the branch unit 7.
b and screw them into the main line compression terminal 6 and branch unit 7
And electrical and mechanical connection between the trunk cables 1 on both sides. Then, the tulip contact 9 is screwed into the screw hole 7c provided in the center of the branching unit 7 and the external thread 8a is screwed into the tulip contact 9 to be connected.
In this structure, a pin contact fixed to a branch cable (not shown) is inserted into the tulip contact 9.

[0008]

According to the branch structure shown in FIG. 5, compared with the conventional wiring technique described with reference to FIGS. There are advantages that interference can be reduced and that the power capacity of the trunk cable can be easily increased. However, this FIG.
Is difficult to assemble in a factory, in which two trunk compression terminals 6 are connected by bolts 8 with an intermediate branch unit 7 interposed therebetween. Disassembly and assembly work is also complicated. In addition, there is a branch unit 7 in addition to the main line compression terminal 6 fixed to the main line cable 1, and the number of parts is increased, so that parts management at a factory or on site is complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional disadvantages. The structure of the branch section is simplified, the branch section can be easily assembled in a factory, and the trunk line can be separated and installed on site. An object of the present invention is to provide a high-voltage power distribution line with a branch that can easily perform a reconnection operation.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a high-voltage power distribution line with a branch provided with a branch for branch wiring in the middle of a trunk cable. A pair of main line compression terminals fixed to each other have opposite step shapes so that they engage with each other, and their opposing surfaces are contact surfaces and are in direct contact with each other while meshing with each other. Are fixed together with bolts, and the external thread of the tip of the tulip contact passed through the through hole made in one main line compression terminal is screwed into the screw hole provided in the other main line compression terminal, and connected and fixed. A pin contact fixed to a branch cable to be branched from the branch portion is inserted into the tulip contact.

A second aspect of the present invention is characterized in that the pair of main line compression terminals of the first aspect has a concentric circular cross section with the main line cable as a whole in a state of being engaged with and connected to each other.

According to a third aspect of the present invention, one of the pair of main line compression terminals in the first aspect is made of soft copper and the other is made of hard copper, and fine irregularities are formed on a contact surface of the main line compression terminal made of hard copper. It is characterized in that the contact surface of the trunk compression terminal made of soft copper is smoothed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the embodiments shown in FIGS. This embodiment has a configuration in which a plurality of trunk cables 1 are connected in series with a branch portion 5 interposed therebetween, similarly to the above-described example of laying the power trunk line in FIG. As shown in FIGS. 1 and 2, the branch section 5 of the embodiment has a pair of trunk compression terminals 10 and 11 respectively compressed and fixed to the conductors 1 a of the trunk cable 1 on both sides of the branch section 5. It has. Each of the main line compression terminals 10 and 11 has an inverted step shape so as to engage with each other, and the opposing surfaces are respectively contact surfaces 10.
a and 11a, which are in direct contact with each other in a state of meshing with each other. In this embodiment, each main line compression terminal 10,
Step portion 1 having contact surfaces 10a, 11a of 11 respectively
Each of 0e and 11e has a semicircular cross section and bases 10f and 11e.
f is a circular cross-section, and thus forms a concentric circular cross-section with the main cable 1 as a whole in a state of being engaged with and connected to each other. Therefore, it is easy to design and manufacture the insulating and shielding layers of the conductor part of the branch part 5, that is, the part of the main compression terminals 10 and 11.

Furthermore, the pair of trunk compression terminals 10, 1
Reference numeral 1 denotes one trunk compression terminal 10 on the branch cable 3 side.
Each of the bolts 14 passed through the two through-holes 10b formed in the stepped portion 10e is connected to the contact surface 11a of the other main line compression terminal 11.
The two main-line compression terminals 10 and 11 are directly connected to each other by screwing and tightening into the two screw holes 11b provided in the main body. Further, another through-hole 10 is formed at the center position of the stepped portion 10e of the one main line compression terminal 10 (the center position of the contact surface 10a).
Then, the tulip contact 15 passed through c is screwed and fixed in a screw hole 11c formed in the center of the contact surface 11a of the other main line compression terminal 11 with the external thread 15b connected to the main line compression terminal 11. I have. Then, a pin contact 18 fixed to the tulip contact 15 on the side of the branch cable 3 to be branched from the branch portion 5.
Is inserted. The back side of the through hole 10b of the main line compression terminal 10 is a counterbore 10d. The tulip contact 15, which is electrically connected by inserting a pin contact 18, has a detachable operation hole 15a at the base thereof for inserting a tool and performing a rotating operation.

In this embodiment, the material of one of the main line compression terminals 10 is soft copper, and the other of the main line compression terminals 11 is hard copper, and the contact surface 11a of the main line compression terminal 11 made of hard copper, for example, is formed on the contact surface 11a. Fine irregularities 11d are formed by knurling or the like, and the contact surface 10a of the main line compression terminal 10 made of soft copper is smoothed. Therefore, bolt 14
When the two main-line compression terminals 10 and 11 are tightened and fixed with each other, fine irregularities 11d on the hard-copper main-line compression terminal 11 side will bite into the surface of the soft-copper main-line compression terminal 10, and both contact surfaces 10a and 11a The contact resistance between them can be sufficiently reduced. Also, as described above, one contact surface 11
The two main-line compression terminals 10 and 11 are connected in a state where the fine irregularities 11d of the a are cut into the other smooth contact surface 10a, so that a large resistance to the tensile force acting on the branch portion 5 in the main-line longitudinal direction is obtained. Becomes Therefore, bolt 14
Even if the tightening torque is the same, the coupling force in the longitudinal direction of the trunk line between the two trunk line compression terminals 10 and 11 increases, and the tensile strength of the conductor portion at the branch portion 5 increases.

The fine unevenness provided on the contact surface 11a of the hard copper compressed main line terminal 11 preferably has a difference between a peak and a valley of about 0.5 mm or less. Further, the fine unevenness may be provided on the entire surface of the contact surface 11a or may be provided on a part thereof. Also, these fine irregularities
It is not limited to a group of independent hills as in the knurling described above, but may be formed in various other shapes such as a wavy section such as a washing board.

The details of the branching section 5 will be further described.
1 and 2, 16 is an L-shaped connector, 17 is a branch compression terminal, 19 is a semiconductive layer, 20 is an insulating rubber layer, 2
1 is a semiconductive layer, 22 is an insulating rubber layer, 23 is a coating layer, 24
Is a coating layer, 25 is a cable adapter, 26 is a cable adapter, and 27 is an arc extinguishing collar.

The L-type connector 16 is connected to the branch cable 3.
And a tulip contact 15. The branch compression terminal 17 is compression-fixed to the exposed conductor 3a of the branch cable 3, and is integrally attached to the tip of the branch compression terminal 17 at right angles to the direction. And the above-mentioned pin contact 18.

Further, the main line compression terminals 10, 11, the bolt 1
A semi-conductive layer 19 is formed of a semi-conductive rubber or the like around the periphery of the semi-conductive layer 4 and the tulip contact 15 and the like. Electrical insulation is provided, and a part thereof is formed in a sleeve shape protruding from the tip of the tulip contact 15.

Similarly, a semiconductive layer 21 and an insulating rubber layer 22 integral with the semiconductive layer 21 are arranged so as to cover the branch compression terminal 17 and the base of the pin contact 18 also at the L-shaped connector 16 so that the high voltage And a part of the insulating rubber layer 22 is formed in a sleeve shape, and is inserted into the sleeve-shaped portion of the insulating rubber layer 20 so as to be externally fitted.

Further, the covering layers 23 and 24 are integrally formed so as to cover the insulating rubber layers 20 and 22, respectively, and the two cables 1.3 and the two semiconductive layers 19 and 21 and the two insulating rubber layers 20 and 22 are formed. Cable adapters 25 and 26 made of a synthetic resin are provided between the cable adapters 22 and 22, respectively.

An arc-extinguishing collar 27 is provided at the tip of the tulip contact 15 in consideration of the case where the tulip contact 15 is opened and closed under no-load conditions.

In such a high-voltage power distribution line with a branch, taking into consideration the working efficiency when the main cable 1 is laid,
Main line compression terminals 10 and 11 compressed and fixed to main line cable 1
In a state where the members are fastened and fixed with bolts 14 and the tulip contacts 15 are attached, these trunk cables 1 and the like are connected according to the method described in the example of FIG. It is laid by hanging it on S.

The branch wiring is performed by inserting the pin contact 18 of the L-type connector 16 attached to the tip of the branch cable 3 into the tulip contact 15.

On the other hand, if the power capacity in the building or the power capacity of the floor increases and it becomes necessary to replace the trunk cable 1 with a large-capacity cable, the replacement work is performed at a branching point in the trunk cable 1. 5 two main line compression terminals 1
Utilizing that the structure between 0 and 11 can release the fastening, it is implemented as follows.

The pin contact 18 is pulled out of the tulip contact 15 and the arc-extinguishing collar 27 is removed.
The male screw 15b is screwed into the screw hole 11b of the main compression terminal 11.
Then, the covering layer 23 covering the branch portion is peeled off, and the semiconductive layer 19 and the insulating rubber layer 20 are shifted along the longitudinal direction of the trunk cable 1 so that the bolt 14 is exposed.

Next, the bolt 14 is loosened to release the fastening state between the two main line compression terminals 11, and the end of the desired large-capacity power cable (main line cable 1) is connected to the end of the main line compression terminal 1.
Prepare one with 0 or 11 attached.

Next, after the disassembly operation is performed, the assembling operation is performed. The assembling operation will be described. The main line compression terminals 10, 11 at the ends of the main line cable 1 on both sides of the branch portion 5 are connected to the respective contact surfaces 10a, 11a. Are superimposed and engaged with each other, and the two 10 and 11 are integrally connected by fastening with a bolt 14, and the screw hole 11c of the trunk compression terminal 11 is formed.
The external thread portion 15b of the tulip contact 15 is screwed into the main cable 1 and the semiconductive layer 19 and the insulating rubber layer 20 and the like which have been shifted are integrated by rotating the tulip contact 15 using the attachment / detachment operation hole 15a. Is shifted along the longitudinal direction of the cover layer 23 to its original position, and
Is formed, and the pin contact 18 at the tip of the L-shaped connector 16 is inserted into the tulip contact 15 to obtain the state shown in FIG. The disassembly work is performed in a procedure generally opposite to that described above, but the description is omitted.

[0029]

According to the present invention, a pair of trunk compression terminals fixed to the trunk cables on both sides of the branch portion have opposite step shapes so as to engage with each other, and the opposing surfaces are contact surfaces. The tulip contacts which are in direct contact with each other in a state of being engaged with each other and which are directly fastened and fixed with bolts, and the pin contacts on the branch cable side are inserted through one of the main line compression terminals and the other main line compression terminal In this configuration, the branch unit conventionally required as a center member for connecting a pair of trunk cables is not required, and the structure of the branch portion is simplified. This has the effect of facilitating the assembling work of the branch section in the factory, and also facilitating the work of separating and reconnecting the trunk line on site.

According to the second aspect, since the two main-line compression terminals have a concentric cross-sectional shape with the main-line cable when the two main-line compression terminals are connected by bolts, it is easy to design and manufacture the insulation and the shielding layer of the connection part by the main-line compression terminals. become.

According to the third aspect, when the two main line compression terminals are tightened and fixed with bolts, fine irregularities formed on the contact surfaces of the hard copper main line compression terminals are smooth contact surfaces of the soft copper main line compression terminals. As a result, the contact resistance between the contact surfaces can be sufficiently reduced. Further, the coupling force between the two main line compression terminals in the main line longitudinal direction can be further increased, and the tensile strength of the conductor portion at the branch portion can be increased.

[Brief description of the drawings]

FIG. 1 is a front view of a main part showing a cross section of a part of a branch portion in a high-voltage power distribution line with a branch according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part in FIG.

FIG. 3 is a front view showing an example of laying a power trunk in a skyscraper.

FIG. 4 is a front view showing an example of laying a power trunk in a skyscraper, and is an example in which the present invention is applied.

FIG. 5 shows a branch portion in a conventional high-voltage power distribution line with a branch.
FIG. 3 is an exploded perspective view of a main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Trunk cable 1a Conductor 3 Branch cable 5 Branch part 10 Trunk compression terminal 10a, 11a Contact surface 10b Through hole 10c Through hole 10d Counterbore hole 10e, 11e Stepped portion 10f, 11f Base 11b, 11c Screw hole 11d Fine unevenness 14 bolt 15 Tulip contact 15b Male thread 16 L-type connector 17 Branch compression terminal 18 Pin contact

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-276642 (JP, A) JP-A-6-111864 (JP, A) JP-A-5-83840 (JP, A) 40712 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H02G 15/08 H02G 1/14

Claims (3)

(57) [Claims] 1. A high-voltage power distribution line with a branch provided with a branch portion for branch wiring in the middle of a trunk cable.
A pair of trunk compression terminals fixed to the trunk cables on both sides of the branch section, respectively, have opposite stepped shapes so as to mesh with each other, and the opposite surfaces are contact surfaces so that they are in direct contact with each other. And tighten and fix the two main compression terminals together with bolts, and
The external thread of the tip of the tulip contact passed through the through hole formed in one of the main compression terminals is screwed into the screw hole provided in the other main compression terminal and fixedly connected. The tulip contact is branched from this branch portion. A high voltage power distribution line with a branch, wherein a pin contact fixed to a power branch cable is inserted. 2. The high-voltage power distribution line with a branch according to claim 1, wherein the pair of main line compression terminals form a concentric circular cross section with the main line cable as a whole in a state of being engaged with and connected to each other. 3. A main line compression terminal made of soft copper, wherein one of the pair of main line compression terminals is made of soft copper and the other is made of hard copper, and a fine unevenness is formed on a contact surface of the main line compression terminal made of hard copper. 2. The high-voltage power distribution line with a branch according to claim 1, wherein the contact surface is smoothed.