JP2015146697A - Terminal conversion adaptor for underground line apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal conversion adaptor for an underground line apparatus, capable of, even when an existing circuit breaker is a circuit breaker for a linear type terminal and a new circuit breaker for replacement is a circuit breaker for a T type terminal, being directly connected to the linear type terminal.SOLUTION: A terminal conversion adaptor A electrically connects a plurality of terminals 21 for an apparatus direct connection T type terminating terminal B of an underground line apparatus having the terminals 21 arranged in horizontal one row with apparatus direct connection linear type terminating terminals C of terminal ends of a plurality of cables risen from the underground. The terminal conversion adaptor A includes a T type horizontal part 1 having the same structure as that of the apparatus direct connection T type terminating terminal B. A lower end of a T type vertical part 2 includes a strap terminal 4 freely connectable to the apparatus direct connection linear type terminating terminal C. As the terminal conversion adaptor A, 2 types of terminal conversion adaptors in which positions of the vertical parts 2 are shifted back and forth are prepared, and the 2 types of terminal conversion adaptors A are alternately connected to the plurality of terminals 21 arranged in horizontal one row of the underground line apparatus.

Description

This invention uses existing high-voltage cables and terminals launched from the ground in replacement work of equipment such as road-mounted switches installed on the road for power supply, and installs a new road switch. It relates to a terminal conversion adapter for underground equipment that can be installed.

Conventionally, as shown in FIG. 8, the road-mounted switch 24 is generally installed on a manhole or handhole (hereinafter collectively referred to as “manhole”) 23 and is launched from the ground. The high-voltage cable 22 is connected to the switch 24 by attaching a device direct connection linear terminal connection terminal C (hereinafter referred to as “linear terminal C”).

In recent years, as shown in FIG. 9, there is a need to reduce the size of equipment, improve reliability, extend its life, etc., and do not use sulfur hexafluoride gas (SF ₆ gas) in consideration of environmental impact. It has been replaced with a middle-ground multi-circuit switch (T-type terminal switch) 25. In such a T-type terminal switch 25, the equipment is directly connected to a T-type terminal connection with good workability. A terminal (hereinafter referred to as “T-type terminal”) B is used (hereinafter, “T-type terminal switch 25” is referred to as “switch 25”).

Further, the conventional linear terminal C has a large diameter, and the trunk diameter is different from that of the T-shaped terminal B. The sizes do not match, and the terminals are not compatible. Therefore, when the switch 24 using the existing linear terminal C is replaced with the switch 25 using the T-type terminal B, the so-called cable terminal set is replaced with the T-type terminal B. It will be replaced. However, if such cable terminal replacement work is performed, the working time and cost will increase. Further, in the rearrangement of the cable terminal, since the terminal of the existing cable is cut, the length of the cable becomes insufficient and the cable may be extended.

Therefore, the power cable extension adapter disclosed in Patent Document 1 is used in the reconfiguration work of the cable terminal. This power cable extension adapter is a power cable extension adapter for connecting a connection part of a road device installed on a manhole and a connection part of an existing cable existing in the manhole, A cable portion having flexibility; provided at one end of the cable portion; connected to the roadside device; one-touch connectable device-side connector; provided at the other end of the cable portion; It has a cable connection portion and a cable side connection connector that can be connected by one touch.

A cutting process for cutting a portion existing in the manhole of a cable portion of an existing cable connected to an old road device, a removal process for removing the old road device, and a connection portion of the existing cable. Using the adapter for extending the power cable, connecting the step of installing a new road device, installing the new road device on the manhole, connecting the new road device, and connecting the existing cable. The equipment on the road is replaced by performing a connection process.

JP 2009-296773 A

However, in the above-mentioned Patent Document 1, the existing high-voltage cable is cut, and the cutting operation of the high-voltage cable is a work that uses advanced technology and a great deal of nerve. An increase in cost is inevitable. Furthermore, when one multi-circuit switch is divided between the electric power company and the electric power consumer, and the existing high-voltage cable is owned by the electric power consumer, it is said that the high-voltage cable is disconnected. Then, various inconveniences and inconveniences may occur, such as not being able to obtain permission or taking time to obtain permission.

Further, in Patent Document 1, since the connection work between the high-voltage cable and the terminal is performed in the underground manhole, it is necessary to perform waterproofing on the connection part, and further, it requires work and cost. It becomes.

Furthermore, as a special case, there is a limitation in the underground volume, there is a case where a manhole cannot be placed under the switch 24, and a conduit with a built-in cable is standing directly on the lower part of the switch 24 that is a full foundation without a cavity. . In such a case, since the cable is connected inside the pipeline, the above-mentioned Patent Document 1 cannot cope with it.

The present invention has been made in view of these points, and when an existing switch replaces a switch using a linear terminal with a new switch, the new switch uses a T-type terminal. Even so, it is possible to provide a terminal conversion adapter for underground equipment that can be connected directly to a straight terminal of the existing cable without disconnecting the existing cable, and can be connected to a new switch. The present invention solves the above problems.

  The first aspect of the present invention is the above-mentioned terminal of a ground wire device having a plurality of terminals for a device direct connection T-type terminal connection terminal in a horizontal row, and the device direct connection linear shape of terminal portions of a plurality of cables raised from the ground. A terminal conversion adapter for electrically connecting a terminal connection terminal, wherein the terminal conversion adapter has a T-shaped horizontal portion having a structure similar to that of a directly connected T-type terminal connection terminal, and a lower end of the T-shaped vertical portion is The terminal conversion adapter is composed of a terminal that can be connected to the apparatus direct connection linear terminal connection terminal, and the terminal conversion adapter prepares two types of terminal conversion adapters in which the position of the vertical portion is shifted back and forth. It was set as the terminal conversion adapter for underground line apparatus which was the structure which connects the said 2 types of terminal conversion adapter alternately to the several terminal located in a line.

The invention according to claim 2 is that the adjacent straight terminal connection terminals at the terminal ends of the plurality of cables are connected to the vertical portions where the two types of terminal conversion adapters are alternately connected, thereby adjacent to each other. The terminal conversion adapter for underground cable equipment according to claim 1, wherein the equipment direct connection linear terminal connection terminal is arranged so as not to contact.

According to a third aspect of the present invention, there is provided the terminal conversion adapter for underground cable device according to the first or second aspect, wherein the lengths of the horizontal portions of the two types of terminal conversion adapters are the same.

According to a fourth aspect of the present invention, there is provided a platform having a certain height for raising the height of the underground cable device on the foundation on which the underground cable device is installed when the terminal conversion adapter for the underground cable device is used. It was set as the terminal conversion adapter for underground cable apparatus in any one of the said Claim 1, 2 or 3 provided.

According to the first aspect of the present invention, in the replacement work of the road-mounted switch, the existing cable can be used as it is without cutting the existing cable and can be directly connected to these. Thus, it is not necessary to perform a cable terminal reassignment work as in the prior art, and it is possible to shorten the work time and the waste such as the terminal material. Moreover, since the cable is not cut, it is safer than anything.

Furthermore, since the cable is not cut, even if the cable is owned by a power consumer, it is not necessary to obtain permission to cut, which greatly contributes to reducing the burden on workers. In addition, two types of terminal conversion adapters for underground equipment are prepared with their vertical T-shaped parts shifted forward and backward, and a plurality of terminals arranged in one horizontal row of the underground equipment are provided. Because it is configured to connect alternately, even if the equipment direct connection linear terminal connection terminal connected to the terminal at the lower end of the vertical part of each adapter has a large diameter, it shifts back and forth, so the terminal conversion adapter after replacement is in front It can be smoothly connected to each device-side bushing along with good workability, and the working time can be shortened.

According to the invention of claim 2, adjacent to each vertical portion in which two types of terminal conversion adapters are alternately connected, the device direct connection linear termination connection terminals at the termination portions of the plurality of cables are respectively connected to each other. Since the apparatus direct connection linear terminal connection terminals are arranged so as not to contact each other, even if these apparatus direct connection linear terminal connection terminals have a large diameter, they can be easily connected without difficulty.

According to invention of Claim 3, since the length of the horizontal part of two types of terminal conversion adapters was made into the same length, when connecting the terminal conversion adapter for underground line apparatuses to an underground line apparatus, each middle line apparatus This is convenient because the detection caps at the rear end of the mobile terminal conversion adapter are arranged in the same position, making the detection operation extremely easy.

According to invention of Claim 4, when using the terminal conversion adapter for underground equipment, on the foundation which installs the above-mentioned road installation type switch, the fixed height which raises the height of the said road installation type switch concerned Since the pedestal is provided, it is convenient that the workability is not impaired even if the terminal conversion adapter is connected to the existing straight cable terminal connection terminal of the rising cable and the terminal conversion adapter becomes longer. In addition, since the existing linear terminal can be placed inside the device without being dropped into a manhole that is underground, excessive waterproofing is unnecessary. Furthermore, it becomes easy to arrange and attach a cable cleat that mechanically grips the bottom plate and cable to prevent moisture from entering from the manhole.

It is the schematic which shows a mode that a linear terminal is connected to the lower end part of the terminal conversion adapter of the embodiment of this invention, and an upper connection part is connected to an apparatus side bushing. (a) It is side surface sectional drawing of the terminal conversion adapter of the embodiment of this invention, Comprising: When the said terminal conversion adapter is attached to a switch, a vertical part is located in the back | inner side. (b) It is a front view of the terminal conversion adapter of said (a). It is side surface sectional drawing of the terminal conversion adapter of the embodiment of this invention, Comprising: When the said terminal conversion adapter is attached to a switch, a vertical part is located in a near side. It is a partially omitted plan view of a state where the terminal conversion adapter according to the embodiment of the present invention is started up from the foundation. It is a partially abbreviated enlarged plan view of a state where the terminal conversion adapter according to the embodiment of the present invention is launched from the foundation. It is a partially omitted side view showing a state where a switch for a T-type terminal is installed on a foundation using the terminal conversion adapter according to the embodiment of the present invention. It is a partially-omission front view which showed a mode that the switch for T type terminals was installed on the foundation using the terminal conversion adapter of the embodiment of this invention. It is a partially omitted front view and a partially omitted side view of a conventional linear terminal switch. It is a partially omitted front view and a partially omitted side view of a switch for a T-type terminal.

(Embodiment example)
Hereinafter, a terminal conversion adapter for underground cable equipment (hereinafter simply referred to as “terminal conversion adapter”) A according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the terminal conversion adapter A of this embodiment is based on the configuration of a T-type terminal B provided at the end of a high-voltage cable connected to a multi-circuit switch for a T-type terminal. (See FIG. 9).

Here, the configuration of the terminal conversion adapter A is basically the same as the configuration of the existing T-type terminal B, but the lower end portion of the vertical portion 2 of the terminal conversion adapter A is the terminal portion of the high-voltage cable 22. The linear terminal C attached to can be connected. Specifically, as shown in FIG. 1 and FIG. 2, a so-called battledore terminal (hereinafter simply referred to as a “freight board terminal”) 4 is used, which is a battledore terminal inside the existing linear terminal C. It can be connected and fixed with bolts and nuts.

In addition, as the terminal conversion adapter A, two types of adapters having different positions of the vertical portion 2 that supports the T-shaped horizontal portion 1 are prepared. As shown in FIG. 2 and FIG. 3, one is that the length from the T-shaped vertical part 2 to the connection part 3 to the device-side bushing 21 is shorter than the existing T-type terminal as A1. On the contrary, the long one is A2. Further, the lengths of the T-shaped horizontal portion 1 and the vertical portion 2 of the terminal conversion adapters A1 and A2 are the same.

Other configurations are basically the same as those of the existing T-type terminal B. For example, the front surface of the horizontal portion 1 forming the T shape is a connection portion 3 composed of a concave portion connected to the device-side bushing 21, and the rear surface thereof is a voltage detection cap 5, an insulating plug 6 inside thereof, and a tightening A bolt 7 is provided, and the tip of the tightening bolt 7 projects into the recess of the connecting portion 3.
ing.

Next, using the terminal conversion adapter A of this embodiment, the switch 25 for attaching the T-type terminal B is installed on the manhole 23 where the high-voltage cable 22 to which the linear terminal C is attached rises. How to connect is described.

First, the start-up high-voltage cable 22 to which the linear terminal C is attached will be described. As shown in FIG. 8, the high-voltage cable 22 is a three-phase high-voltage cable along the side surface of the switch 24 for the linear terminal. The linear terminal C of the cable 22 is set up in one row. On the other hand, as shown in FIG. 9, the high-voltage cable 22 of the T-type terminal B to be replaced has three-phase T-type terminals B arranged in a line along the front of the switch 25 for the T-type terminal. Deploy. The straight terminal C is generally larger in diameter than the T terminal B.

As shown in FIGS. 8 and 9, the linear terminal switch 24 is higher and larger than the switch 25 for the T terminal.

Subsequently, the terminal conversion adapter A is used for actual work. Here, the switch 25 for the T terminal is already installed on the base 26 of the manhole 23, and the straight terminal C, the terminal conversion adapter A, and the device side bushing 21 of the switch 25 for the T terminal are still connected. It is assumed that it has not been done.

First, of the three high-voltage cables 22 rising from the ground, the insulation tube outside the linear terminal C of one high-voltage cable 22 is pulled down to expose the battledore terminal (not shown), and FIG. The terminal board adapter 4 is overlapped with the clad board terminal 4 and fixed with bolts and nuts, and the insulation cylinder of the linear terminal C is pulled up and put on the terminal converter adapter. Thereafter, the connection part 3 of the terminal conversion adapter A is connected to the device-side bushing 21 for connection. This connection is performed in the same manner as the conventional T-type terminal B.

Thereafter, the wing plate terminal 4 of each terminal conversion adapter A and the wing plate terminal of the straight terminal C of the raised high voltage cable 22 are sequentially overlapped and fixed, and the connection portion 3 of this terminal conversion adapter A is connected to the device side. The three-phase linear terminals C may be arranged in a line along the side surface of the switch 24 as described above, but may be fixed to the bushing 21. These T-type terminals are arranged in a line along the front of the switch 25. In addition, the straight terminal C has a larger diameter than the T terminal B, and even if these connection operations are performed, the interval between the adjacent device-side bushings 21 of the switch 25 is narrow and arranged in a row. It is not something that can be done.

In addition, here, the linear terminal C has an outer diameter of about φ90 mm, and the vertical portion 2 of the terminal conversion adapter A has an outer diameter of φ65 mm (65 mm pitch).

As described above, the width of the vertical portion 2 of the three-phase terminal conversion adapter A and the linear terminal C is φ65 mm × 3 <φ90 mm × 3. Here, the terminal conversion adapter A attached to the linear terminal C It is impossible to arrange them in a line along the front. Therefore, as shown in FIGS. 4, 5, and 6, the position of the linear terminal C connected to these terminal conversion adapters A is shifted back and forth so that these terminal conversion adapters A are placed in front of the switch 25. Adjacent linear terminals C are arranged so that they do not contact each other even if they are arranged in a line along the line.

Specifically, as shown in FIG. 5, the straight terminal C connected to the terminal conversion adapter A of the switch 25 located on the rightmost side is viewed from the right as “rear”, “front” and “rear”. Place in the “valley”. When the straight terminal C is in the “rear” position, the terminal conversion adapter A1 is used, and in the “front” position, the terminal conversion adapter A2 is used. As shown in FIG. To do.

The straight terminal C connected to the terminal conversion adapter A of the switch 25 for the T-type terminal of the other circuit adjacent to the left position of the front terminal “front”, “rear”, and “front” in “Yamagata” Similarly, a straight terminal C arranged at a pitch of 100 mm and connected to the terminal conversion adapter A of the switch 25 of another circuit adjacent to the left position of the straight terminal C is “rear”, “front”, and “rear” in plan view “valley” “Pattern” and similarly arranged at a pitch of 100 mm. By changing the arrangement for each circuit in this way, the terminal conversion adapters A can be arranged in a line along the front surface even in a narrow space. Thereafter, the opening on the upper surface of the foundation 26 is closed with the bottom plate 27 to close the opening, and the high voltage cable 22 is fixed with the cable cleat 28 on or below the bottom plate 27.

Further, even when the linear terminal C connected to the terminal conversion adapter A is shifted back and forth as described above, the terminal conversion adapter A has its own terminal in the linear terminal C as the entire length. Since the conversion adapter A is added, the length of the terminal conversion adapter A is long, and the position of the device-side bushing 21 of the switch 25 for the T-type terminal is low, so that workability may be impaired. is there. Moreover, the existing linear terminal C may be dropped into a manhole that is underground, and waterproofing may be required.

In this case, as shown in FIGS. 6 and 7, before installing the switch 25 for the T-shaped terminal on the foundation 26, a gantry 29 made of a rectangular frame having a certain height in plan view. By previously installing on the foundation 26, it is possible to dispose the existing linear terminal C inside an apparatus that does not require excessive waterproofing treatment without causing any hindrance to workability.

The gantry 29 may be provided integrally with the channel base 30 in advance. If a part of the front surface of the gantry 29 is provided so as to be detachable, the gantry 29 is provided in the interior when the front surface of the channel base 30 is previously opened. It is also convenient because you can see your work and work with your hands.

Furthermore, in this embodiment, since the connection between the terminal conversion adapter A and the linear terminal C of the high-voltage cable 22 is performed above the base 26, that is, on the ground, waterproofing of the connecting portion is not necessary. Minutes and work hours.

In the above embodiment, the linear terminal C has an outer diameter of about φ90 mm, the vertical portion 2 of the terminal conversion adapter A is arranged in a row with an outer diameter of φ65 mm (65 mm pitch), and further, an inclined state of 100 mm pitch. The linear terminal C of the terminal conversion adapter A is arranged in “rear”, “front” and “rear” “valley” etc., but the outer diameter of the linear terminal C, the vertical part of the terminal conversion adapter A The outer diameter of 2 and the pitch at which the terminal conversion adapter A is arranged in an oblique state are not limited to these numerical values, and are numerical values that can be accommodated in the switch 25 for the T-type terminal and that the linear terminals C do not contact each other. If so, other things may be used.

Of course, the gantry 29 is not used when it is unnecessary. Further, the terminal conversion adapter A is used to connect to the switch 25. However, the terminal conversion adapter A is not limited to the switch 25 but can be connected to the ground using the terminal conversion adapter A. Any wire device is acceptable. In addition to the length of the T-shaped horizontal portion 1 of the terminal conversion adapters A1 and A2, the length of the vertical portion 2 is also the same, but the length of the vertical portion 2 is not the same and may be irregular.

Further, when replacing the high-voltage cable 22 including the straight terminal C, the T-type terminal B is newly assembled without using the terminal conversion adapter A, and the three-phase one set of the switch 25 is used as a unit. Can be directly connected to each circuit.

A terminal conversion adapter A1 terminal conversion adapter A2 terminal conversion adapter B T type terminal C linear terminal 1 horizontal part 2 vertical part 3 connection part 4 battledore terminal 5 detection cap 6 insulation plug 7 tightening bolt 21 equipment side bushing 22 high voltage cable 23 Manhole 24 Switch 25 Switch 26 Foundation 27 Bottom plate 28 Cable cleat 29 Mounting base 30 Channel base

Claims (4)

Electrically connect the above-mentioned terminals of underground line equipment having a plurality of terminals for T-type terminal connection terminals directly connected to the equipment and the equipment direct connection linear terminal connection terminals at the terminal ends of a plurality of cables raised from the ground. A terminal conversion adapter that connects to
In the terminal conversion adapter, the T-shaped horizontal portion has the same structure as the device direct connection T-type terminal connection terminal, and the T-shaped vertical portion lower end has a terminal that can be connected to the device direct-connection linear terminal connection terminal.
The terminal conversion adapter prepares two types of terminal conversion adapters in which the position of the vertical portion is shifted back and forth,
A terminal conversion adapter for underground cable equipment, wherein the two types of terminal conversion adapters are alternately connected to a plurality of terminals arranged in a horizontal row of the underground cable equipment. By connecting the device direct connection linear terminal connection terminal at the terminal end of each of the plurality of cables to each vertical portion where the two types of terminal conversion adapters are alternately connected, the adjacent device direct connection linear terminal connection terminal is connected. The terminal conversion adapter for underground cable equipment according to claim 1, wherein the terminal conversion adapter is configured to be arranged so as not to contact with each other. The terminal conversion adapter for underground cable equipment according to claim 1 or 2, wherein the horizontal portions of the two types of terminal conversion adapters have the same length. When using the terminal conversion adapter for underground cables, a gantry having a certain height for raising the height of the underground cables is provided on the foundation on which the underground cables are installed. The terminal conversion adapter for underground line apparatus in any one of the said Claim 1, 2, or 3.

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