JP2592399Y2 - Construction transformer - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application] The present invention is intended for use in the case of replacing existing pole transformers, high voltage cutout switches, and other pillar-mounted equipment on distribution lines, without interruption. It relates to improvement of transformers.

[0002]

2. Description of the Related Art In recent years, in the high-tech era, a stable supply of electricity in today's social life has been achieved, such as the spread of advanced industrial equipment such as computers and the introduction of various types of high-performance home appliances. There is a growing demand for power outages. Regardless of construction power outages or failure power outages, social perceptions of power outages are extremely severe in that even instantaneous power outages are not permissible. On the other hand, from the viewpoint of electrical work, there is an increasing demand from nighttime work to daytime work in consideration of improvement of work environment and shortening of work time for construction workers.

[0003]

[Problems to be Solved by the Invention] In order to respond to the above-mentioned social needs, today, in order to avoid construction power outages, for example, a mobile transformer car and a bypass cable car are used to provide consumers with uninterrupted power outages. An uninterruptible construction method capable of performing hot-line work while supplying power has been developed, and has been adopted today when a power outage is not allowed on the customer side. However, when the above-mentioned uninterruptible construction method is carried out, for example, when a device mounted on the power pole 3 such as the power distribution transformer 1 or the cutout switch 2 shown in FIG. Large-scale mobile transformer vehicles and bypass cable vehicles that individually mount substation components such as switches and switchgear on the vehicle are moved to the construction site, where the bypass cable and bypass cable vehicle on the mobile transformer vehicle side are installed. After connecting the high-voltage cable to the high-voltage distribution line in the healthy section outside the construction section, connect the low-voltage cable of the mobile transformer car to the low-voltage distribution line in the construction section to the customer side. While continuing to supply power without interruption, the switch on the track was opened, and the work section was completely replaced with no voltage, and replacement work for the pole transformers such as the distribution transformer 1 was performed.

However, in order to carry out the uninterruptible construction method, a large number of equipment and vehicles for that purpose, that is, special equipment such as a construction switch, a moving transformer car, a bypass cable car, and a large vehicle are used. Such equipment and vehicles are required in order to carry out the uninterruptible construction method, for example, when replacing relatively small equipment such as cut-out switches and arresters or installing new equipment. However, when the above-mentioned construction method is implemented in an urban area, for example, the width of the road at the construction site is narrow and it is difficult to pass or park a large vehicle, or the traffic congestion is caused by long-time parking of a large vehicle in a place with many traffic vehicles. In consideration of road conditions and traffic conditions, such as when there is a risk of causing accidents, equipment arrangements should be made when implementing a non-interruptible construction method by dispatching a large moving transformer car or bypass cable car at each construction Today, new problems have emerged, such as restrictions on applications and limited places of application (implementation). In addition, even during relatively small-scale construction such as replacement of cut-out switches etc., large-scale preparatory work such as dispatching a mobile transformer car and preparing the accompanying materials and personnel is required. However, considering the traffic conditions and the like, the construction is often performed late at night, and the construction cost is high.

[0005] In view of the various problems described above, the present invention is applicable to relatively small-scale construction such as replacement of a power distribution transformer attached to one telephone pole and pole mounting equipment attached thereto. A transformer with the same scale as a distribution transformer without using a large mobile transformer car, and equipped with a small but auxiliary device that has almost the same functions as a mobile transformer car As in the case of using the above-mentioned moving transformer car, the on-vehicle (light vehicle) enables the uninterruptible construction method to be implemented.
Another object of the present invention is to provide a construction transformer that is convenient for mounting columns.

[0006]

According to the present invention, a primary switch is provided on the upper part of the body of the transformer case, and the primary switch is provided on the lower part of the body of the transformer case.
Side, a secondary switch is attached to each side, and the transformer cable
In the vicinity of the primary switch mounted on the upper side of the switch, an inverted L-shaped
With the pair of cable supports formed on the case facing upward
Provided to be able to move up and down and detachable, at the lower part of the transformer case
Near the secondary switch attached to the side, a pair of cable supports
To the case so that it can be freely inserted and removed in the horizontal direction.
At the free end of each cable support, the above 1, 2
Pull out the insulated cable from the secondary switch
Cable that is parallel on the side and detachably clamped
The holding member is detachably attached .

[0007]

According to the present invention, despite the fact that the construction transformer has almost the same function as the existing large-sized mobile transformer car, the auxiliary equipment such as the primary and secondary switches is compact. In the transformer case body, so that it can be mounted on a light vehicle like an existing distribution transformer, or
Because it is possible to mount the power pole, when uninterrupted work in places where it is difficult to pass or park a large mobile transformer car,
Work can be carried out while mounted on a light vehicle or temporarily mounted, and when performing relatively small-scale and simple construction such as replacement of mounting equipment, use a large-scale mobile transformer car. It is convenient because the uninterrupted work can be performed in a short time with minimum equipment and personnel. Also, in the construction transformer of the present invention, it is difficult to pull out the thick and heavy insulated cable led out from the accessory equipment due to the installation location of the accessory equipment. Has been pulled out of the direction. For this reason, the weight of the insulated cable is easily added to the draw-out end of the accessory, and the insulated cable is damaged by its own weight by supporting the insulated cable with the cable support while preventing this part from being bent, damaged, or detached. Can be prevented beforehand, and the insulation cable itself is damaged due to its own weight and external force during use as well as during storage of the transformer for construction, and the insulation cable itself is damaged, and the attached equipment is adversely affected. Such a situation can be reliably prevented, and this kind of transformer can be used in a stable state for a long time. Furthermore, by providing a protective frame around each accessory device as necessary, it is possible to solve the problem that the accessory device is in contact with and damaged by other devices, and it is also possible to mount the protective frame on a pillar. Since it can be used as a scaffold, there is also an advantage that work on pillars can be performed safely.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 11 denotes a transformer of the same type as an existing distribution transformer. Inside the transformer, as shown in FIG. 6, primary and secondary windings 12 and 13 are wound around an iron core (not shown). The transformer body 14 is housed together with the insulating oil. Reference numeral 15 denotes a tap switch for switching the tap voltage on the primary winding 12 side, and an operation handle 17 is mounted on the case 16 so as to be switchable so that the switching operation can be performed from outside the transformer 11. Reference numeral 18 denotes a high-voltage cutout switch with a built-in current limiting fuse 18a mounted on the upper side of the case 16 outside the transformer 11, and is directly connected to the primary winding 12 of the transformer body 14. In FIG. 4, three phases are integrally arranged in the circumferential direction of the case 16 (see FIG. 4). The high-pressure cutout switch 18 serves as an existing primary switch and primary bushing, and is hereinafter simply referred to as the primary switch 18. Reference numeral 19 denotes an insulation cable on the primary side which is drawn out from the primary switch 18 toward the upper side of the transformer 11. The insulation cable 19 prevents sliding damage to the road surface like a normal bypass cable and prevents the cable from being damaged. In order to ensure the above current capacity, a thick insulating coating having a large diameter, weight, and flexibility is used. The connecting portion 20 between the primary-side insulated cable 19 and the primary switch 18 is formed of, for example, rubber having excellent weather resistance and tracking resistance in a mold cone shape. Next switch 1
The terminal on the side of the cable 8 and the core wire on the side of the cable 19 are provided so as to be detachable by, for example, a one-touch method.

In FIG. 2, reference numeral 21 denotes a secondary switch, which is connected to a secondary winding 13 of a transformer main body 14 via a voltage detector 22 as shown in FIG. When connecting the transformer 11 to the low-voltage distribution line 46 shown in FIG. 2, the secondary switch 21 performs power detection and phase connection with the power detection phase detection device 22.
To prevent accidents and misconnections. As shown in FIGS. 1 and 2, the secondary switch 21 is mounted on the lower side of the case 16 at a position opposite to the primary switch 18 via a mounting seat 23. Reference numeral 24 denotes an operation handle of the secondary switch 21, and reference numeral 25 denotes a lead wire connecting the transformer main body 14 and the secondary switch 21. Further, reference numeral 26 denotes a secondary-side insulated cable which is drawn out horizontally from the secondary switch 21 to the side of the transformer 11, and has a large diameter and a heavy weight like the primary-side insulated cable 19. in use. Further, a connecting portion 27 between the secondary side insulation cable 26 and the secondary switch 21 is
Like the primary switch 18, it is formed in a mold cone shape, and is provided so as to be detachable by a one-touch method. As described above, the present invention provides one
The transformer for construction 28 is constituted by including the secondary switch 18 and the secondary switch 21.

Next, in FIG. 1, reference numeral 30 denotes a pair of cable supports for mounting and supporting a large-diameter and heavy insulated cable 19 drawn from the primary switch 18 above the transformer 11. As shown by, for example, a metal pipe or the like is bent into an inverted L-shape, and a vertical portion a thereof is welded to the body of the case 16.
4 (see FIG. 4) so that it can be moved up and down and can be removed. When the upper horizontal portion b reaches a predetermined height position, the tightening bolt 32 screwed to the support bracket 31 is tightened.
The case 16 is fixedly supported. Reference numeral 33 denotes a cable holding member provided at the distal end of the horizontal portion b of the cable support 30. The holding member 33 includes a fastening bolt 34a between the horizontal portions b of the cable support 30 as shown in FIGS. And a pair of holding plates 35 made of hard rubber or the like and having a semicircular cutout groove 35a for inserting the insulated cable 19 and mounted on the horizontal plate 34. And a holding plate 36 that presses and holds the pair of holding plates 35 on the horizontal plate 34 by pressing bolts 35b. When the insulating cable 19 is held, the notch grooves 35 of the pair of holding plates 35 are provided.
a, 35a, the insulated cable 19 is inserted therebetween, the holding plate 35 is mounted on the horizontal plate 34, and a pair of holding plates 35 are attached to the horizontal plate 34 by using a pressing bolt 35b in FIGS. As shown in the figure, fixing the insulated cable 1
9 is pulled out vertically above the primary switch 18 as shown in FIGS. 1 and 5 and at the upper end of the cable support 30 with a large radius of curvature without imposing a load on the connecting portion 20.
It can be mounted and supported smoothly and well. Also, holding plate 3
5 is made of an elastic material such as a rubber member, so that the insulated cable 19 is not adversely affected by overtightening or the like.

Reference numeral 37 shown in FIGS. 1 and 3 designates a cable support for holding the secondary insulated cable 26 horizontally on the side of the secondary switch 21, as shown in FIG. A metal pipe bent in a rectangular shape is attached to the case 16 by freely attaching and detaching it in a horizontal direction to a boss portion 37 a fixed to the case 16. Cable holding member 33 for holding insulated cable 19 above primary switch 18
A cable holding member 33a having the same structure as that of FIG. 1 is provided. As shown in FIG.
The cable can be pulled out smoothly in the horizontal direction while being held and held in the vertical direction by the cable holding member 33a without burdening the connection portion 27 from the side of the next switch 21.
In FIG. 4, reference numeral 38 denotes a protection frame disposed around the primary switch 18 to prevent the primary switch 18 from being damaged by colliding with other devices. Numeral 39 denotes a protection frame for the secondary switch 21 which is mounted above and below the secondary switch 21 (only the upper part is shown in this example) so as to protrude in front of the secondary switch 21. The switch 21 is protected by preventing it from hitting the device. Further, reference numeral 40 denotes a hanger seat used when mounting the transformer for construction 28.

Next, the case where the construction transformer 28 of the present invention is used will be described. As shown in FIG.
When the replacement work of the pillared equipment such as the transformer 42 and the cutout 43 mounted on the work is performed without interruption, the construction transformer 28 may be replaced.
Is mounted on a light vehicle 44 and carried to a utility pole 41 where construction is performed.
If the construction site is not prohibited from parking, use it while it is mounted on the vehicle. If it interferes with other transportation such as parking prohibited, use it directly on the pole to be constructed (not shown) . Now, for example, the case where the pole transformer 42 is replaced will be described. In FIG. 2, one of the construction transformers 28 is replaced.
Open the secondary and secondary switches 18, 21 and then
The insulated cable 19 on the next side is connected to the high-voltage distribution line 45 using a live tool or the like (not shown). Also, the secondary-side insulated cable 26 is connected to the low-voltage distribution line 46 of the transformer 42 by using a hot-line tool. After this, the primary and secondary switches 1
The transformers for construction 28 are operated by inputting 8, 21 respectively. In connection with the insulated cable, until the secondary switch 21 is turned on after confirming that there is no wrong connection or the like by the power detection and phase detection device 22 attached to the secondary switch. Nor. With the above operation, the construction transformer 28 and the transformer 42 are operated in parallel to supply power to the load side.

In the above state, the lead wire 42a on the secondary side of the transformer 42 (connected to the low voltage distribution line 46)
Is disconnected from the low-voltage distribution line 46 in a live state. Subsequently, the high-voltage underline 45a connecting the high-voltage distribution line 45 and the cutout 43 is disconnected at the connection portion with the high-voltage distribution line 45 (in the case of only replacing the transformer 42, simply opening the cutout 43). It is possible to do the work)
At the same time, the cutout 43 is opened. Thereby, the current supply to the transformer 42 can be cut off. After this,
For example, by disconnecting the lead wire 43a connecting the cutout 43 and the primary side of the transformer 42 at the cutout 43 side, the transformer 42 is connected to the distribution lines 45 and 46.
Can be completely isolated from On the other hand, the transformer 4
The second low-voltage distribution line 46 is connected to the construction transformer 28, so that the power is continuously supplied and the customer side is not inconvenienced by a power failure due to the construction.

The transformer 42 isolated from the distribution lines 45 and 46 is lowered to the ground by using, for example, an elevator mounted on another vehicle, and a replacement transformer is mounted on the transformer 42 instead. After the mounting, on the contrary, the secondary side of the mounted transformer is connected to the low-voltage distribution line 46, and the primary side is connected to the cutout 43 using the lead wire 43a. The line 45 and the cutout 43 are connected to a high-voltage underline 45
After connection by a, the cutout 43 is inserted to start energization. Thereafter, the construction transformer 28 opens the primary and secondary switches 18, 21 and then disconnects the primary and secondary insulated cables 19, 26 from the distribution lines 45, 46 to carry out the replacement work of the transformer 42. That's the end. Further, in addition to the transformer 42, the exchange of the cutout 43 or the installation or replacement of a column equipment (not shown) may be performed in the same manner as described above. When the work on the utility pole 41 is completed, the construction transformer 28 may be moved to the next utility pole by the light vehicle 44, so that even on narrow roads or places with heavy traffic, utility poles that require construction may be used. Uninterrupted work can be performed quickly and easily directly below the building without any inconvenience to customers.

Next, during the uninterruptible work, the primary and secondary insulated cables 19 and 26 are connected to the high-voltage and low-voltage distribution lines 4.
5 and 46, the insulated cables 19 and 26 are drawn out above and beside the transformer 11 in order to efficiently attach the primary and secondary switches 18 and 19 to the construction transformer 28. In addition, since the insulated cables 19 and 26 themselves have a large diameter and are heavy, the insulated cables 19 and 26 are connected to the distribution lines 45 and 46 as shown in FIG. The same applies when the cable 28 is not used), and due to the own weight of the insulated cables 19 and 26, the connection part 2 between the cables 19 and 26 and the primary and
A large load is applied to 0 and 27. However, cable supports 30 and 37 are attached near the drawing directions of the insulated cables 19 and 26, respectively, and the insulated cables 19 and 26 are mounted and supported in the predetermined drawing directions, respectively. Cable 19, 26
Weight of the cable supports 30 and 37 are received by the cable holding members 33 and 33a of the cable supports 30 and 37, respectively.
, The primary and secondary switches 18, 21 are released from the load of the insulated cables 19, 26, and the connection section 20 is protected. , 27 are not added at all, so that even if the connecting parts 20, 27 are configured in a one-touch system that can be easily attached and detached, the connection relationship between the cables 19, 26 and the switches 18, 21 can be maintained well. During or during use of the construction transformer 28, the connecting parts 20, 2
7 is reliably eliminated by the load of the insulated cables 19 and 26, and the construction transformer 28 is
It can be used stably for a long time without adversely affecting the attached devices (the primary and secondary switches 18, 21). In addition, when the construction transformer 28 of the present invention is mounted, the protective frame 3 for protecting the primary and secondary switches 18 and 21 is provided.
8, 39 can be used together with the base 50 as a scaffold for a construction worker, so that there is also an advantage that the work on the pillar can be performed safely. Further, the construction transformer 28 is connected to the light vehicle 4.
In the case of transporting on the cable 4, the cable support 30 can be lowered to the position shown by the two-dot chain line in FIG. 1 or can be removed and transported. It becomes possible to clear.

[0016]

Since the present invention is configured as described above, it has the following effects. (1), the present invention is the distribution transformer, uninterruptible construction primary necessary, the accessories consisting of the secondary switch. Thus attach each different from the mounting position, the conventional mobile can configure the work transformer having substantially the same function as the transformer vehicle, this results, as well the mounting of the light vehicles, since it is substantially possible to Sohashira, utility pole on the Sohashira gear It is easy to carry out relatively small-scale construction such as replacement work without using a large-sized mobile transformer car or without interruption due to traffic conditions, etc. without interruption. And is most suitable for conveyance. (2) Further, the primary and secondary switch accessories on the relationship between attachment to normal distribution transformer, the insulated cable in the primary side of the switch in consideration of the installation space, debt L-shaped To
Formable and can be moved up and down on the case and removable
And rests on the cable support mounted, mounted to draw upward, also the secondary side switch 1
On the opposite side of the next switch , the insulation cable
Cable that can be inserted and removed horizontally in a horizontal direction
And rests on the support, because it is mounted so that it can draw in the horizontal direction, insulated cables of the primary and secondary side, even both narrow place, be smoothly drawn out without particularly intermingled As well as the primary and secondary
In convenience since switches itself becomes possible to attach a balanced and effective use of the narrow space of the transformer periphery
is there. (3), further, each of the insulated cable in the pull-out direction side, each of the primary and secondary switch Ri by the cable support
In the lead portion, since a large load at the base of the connection portion between each switch is configured to suspended hold as not applied, the lead portion from the switchgear insulated cables with a weight at a large diameter is
The problem of breakage or damage to insulation due to its own weight
Can be reliably avoided, and the
Insulation without adversely affecting accessories attached to the vessel
Cables can be connected and held smoothly and well .
Moreover, each of the cable supports moves up and down with respect to the case.
And can be inserted and removed so that the insulation cable
At the connection with the switch at the base corresponding to the length of the
It is possible to support in a position where it can not be
The holding member provided at the end of the cable support can be released
Each is pulled out from the switch because it is formed in
Parallel the insulated cables and support the insulated cables
It is possible to arbitrarily change the location and pinch it in the optimal place
Insulated cable support work can be performed quickly and reliably
It is convenient.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a construction transformer according to the present invention.

FIG. 2 is an explanatory view showing a use state of the construction transformer of the present invention.

FIG. 3 is a side view of the transformer for construction according to the present invention.

FIG. 4 is a plan view of the same.

FIG. 5 is a vertical sectional view of a main part showing a supporting state of the cable.

FIG. 6 is an electrical connection diagram of the transformer for construction according to the present invention.

FIG. 7 is an explanatory view showing a mounted state of a distribution transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Transformer 16 Case 18 Primary switch 19 Insulated cable 20 Connection part 21 Secondary switch 26 Insulated cable 28 Construction transformer 30 Cable support 33 Cable holding member 33a Cable holding member 37 Cable support 38 Protection frame 40 Protection frame 45 High-voltage distribution line 46 Low-voltage distribution line

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Teruo Kamiya 1-20-31 Sakae, Naka-ku, Nagoya City Inside Toenec Co., Ltd. (72) Inventor Toshiaki Fujita 1st character small needle in Inuyama City, Aichi Energy Support Co. (72) Inventor Norifumi Hotta 35, Fukamama, Nagagusa-cho, Obu City, Aichi Prefecture Inside the High Voltage Electric Research Institute, Japan Buchiuchi (72) Inventor Ryoji Kawamura 1 Aichi-cho, Kasugai-shi, Aichi Pref. Aichi Electric Co., Ltd. Examiner Kenichi Hatori (56) References JP-U 2-113317 (JP, U) JP-A 57-101512 (JP, U) Japanese Utility Model 62-81407 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02B 5/00 H01F 27/02

Claims (1)

(57) [Scope of request for utility model registration] The method according to claim 1 Primary switch on barrel top side of the transformer case, the body portion lower side of the transformer case, the second switch it
Each mounting, primary attached to the upper side of the transformer case
Near the switch, a pair of inverted L-shaped cables
With the support facing upward, the case can be moved up and down and removed.
Of the secondary switch attached to the lower side of the transformer case
In the vicinity, pull out and insert a pair of cable supports horizontally.
Free end of each cable support
At the tip that is pulled out of the primary and secondary switches
The insulated cable is parallel to the drawing direction side, and
The cable clamping member that can be detachably clamped is detachable.
A transformer for construction characterized by being attached .