KR101905441B1 - Elbow Insert and its application for live line replacement of the pad mounted transformer - Google Patents

Abstract

The present invention relates to an elbow insert for replacing a ground transformer for separating and connecting, in an uninterruptible way, an elbow insert used for connecting a ground cable lifted up to the ground in a live wire state to which a power is applied, and an uninterruptible construction method using the elbow insert. More specifically, the elbow insert and the construction method can reduce a working time by a simpler process with simple equipment and can remarkably improve economic feasibility and reliability by increasing safety in an uninterruptible replacing work. To this end, the elbow inert (30) comprises: a conductor member (31) in which a bypass cable (17) connected from a construction switch (18) is electrically connected; a socket conductor (32) of which a position is fixed in an orthogonal direction in an upper end unit of the conductor member (31); an arc extinguishing member (33) with an insulating material by punching a guide hole (34) to access a contact rod (14) of an elbow connector (12) towards the socket conductor (32); an inner semiconductor member (35) covering the outside of the arc extinguishing member (33) and the socket conductor (32); an insert insulating member (36) formed with an insulator by covering the outside of the inner semiconductor member (35), the arc extinguishing member (33), the socket conductor (32), and the conductor member (31); an outer semiconductor member (37) inducing to be grounded when an abnormal current occurs by covering the outside of the insert insulating member (36); and a stand fixing hole (38) installed on a back side of the elbow insert (30) and fixing a position by being held by a parking stand (16).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an elbow insert for replacing a ground transformer, and an elbow insert for replacing the transformer,

The present invention relates to a ground transformer replacement elbow insert for isolating and connecting an elbow connection member used when an underground cable lifted from a ground is connected to a power transformer, and an uninterruptible power supply method using the elbow insert. In detail, the present invention has been made so as to simplify the equipment and utilize the existing equipment to economically reduce the work time and safety of the uninterruptible replacement work.

Generally, electricity is boosted from a high-voltage substation to a high-voltage bolt (about 150,000 to about 340,000 volts), then sent to a low-voltage substation, and decompressed (about 22,000 to 60,000 volts) When the transmission is made to the transformer near the customer, the transformer near the customer decompresses the electricity to 220 volts and supplies it to the customer.

In recent years, underground lines have been replaced with existing lines for urban aesthetics.

The ground transformer 10 used for transforming or opening the underground line has an intermediate wall divided into a high pressure side wall and a low pressure side wall in a housing provided with an opening and closing door and a bushing insert Six parking lugs 11 are provided and five parking stands 16 for parking the elbow joint 30 for connecting the transformer elbow connection 12 separated from the construction and the insulation plug 21 are installed have.

The underground cable 15 is connected to the bushing insert 11 of the ground transformer 10 by being connected to the elbow joint 12 as shown in FIG.

The elbow connecting member 12 for the transformer is electrically connected to the contact terminal (not shown) in the bushing insert 11 through the central contact rod 14 while being connected to the underground cable 15.

The elbow connecting member 12 for a transformer has an insulating layer inside and a shielding layer on the outside to protect the operator from high voltage electricity. The elbow connecting member 12 includes a voltage detecting unit to check whether a load is applied to the elbow connecting member, And the ground transformer 10 can be separated from and connected to each other.

However, it is very dangerous to remove the underground cable from the ground transformer near the customer when using underground transmission.

Conventionally, the underground wire is separated from the transformer-use elbow connecting member 12 connected to the ground transformer 10 to be replaced or to be repaired after noticing a power failure, so that power is not supplied and then replaced.

Since the high voltage current of 20,000 volts or more flows in the elbow connecting member 12 for the transformer when the transformer is replaced, if a mistake is made while separating the elbow connecting member 12 for the transformer from the bushing insert 11, Therefore, it is managed so as to perform construction after shutting off the switch.

Currently, the service line is designed to perform 100% uninterrupted construction. In order to compensate for the inconvenience and loss caused by the power outage on the customer side, the underground line is undergoing uninterrupted construction since early 2000s.

Korean Registered Patent No. 10-842321 (registered on June 24, 2008) Korean Registered Patent No. 10-805224 (registered on Feb. 13, 2008) Korean Registered Patent No. 10-722251 (registered on May 21, 2007) Korean Registered Patent No. 10-769583 (registered on October 17, 2007)

The present invention improves the problems and disadvantages of the apparatus and method used in the conventional uninterruptible power system, and it is a simple and easy-to-use system, And an elbow insert for replacing the ground transformer, and an uninterrupted method using the elbow insert.

Another object of the present invention is to provide a ground transformer replacement elbow having a low risk of a safety accident caused by a short accident and being compatible with a conventional construction switch and a transformer using the transformer as it is, The present invention relates to an apparatus and method for operating an articulated elbow joint member so that an elbow joint member can be safely separated from and connected to a ground transformer through a patent application No. 10-2016-0122817 using an insert and the elbow insert. To provide an uninterrupted method.

According to an aspect of the present invention, there is provided a bushing insert comprising: a plurality of elbow joints (12) to which a contact rod (14) is electrically connected to a bushing insert (11) A replaceable elbow insert for a ground transformer (10) comprising:

The elbow insert (30) has a conductor member (31) to which a bypass cable (17) connected from a construction switch (18) is electrically connected,

A socket conductor 32 fixedly positioned in a direction perpendicular to the upper end of the conductor member 31,

An arc-extinguishing member 33 made of an insulating material and having a guide hole 34 pierced so that the contact rod 14 of the elbow connecting member 12 goes in and out of the socket conductor 32,

An inner semiconductive member 35 surrounding the outside of the socket conductor 32 and the arc soffit member 33,

An elbow insert insulation member 36 which surrounds the conductor member 31, the socket conductor 32, the arc soffit member 33 and the outer side of the inner semiconductive member 35 and is formed of an insulating material,

And an outer semi-conductive member 37 which surrounds the outside of the elbow insert insulating member 36 and induces a ground when an abnormal current is generated,

And a stand fixture 38 installed on the rear side of the elbow insert 30 and fixed to the parking stand 16.

At this time, the stand fastener 38 is further provided with an eye bolt 39 which protrudes toward the wall surface of the ground transformer 10 to prevent the insert body 30 from flowing.

After confirming the condition of the line loop, the step (a) of confirming the state of the ground transformer for replacement,

An elbow separator installation step (b) for installing the elbow separator (20) in a ground transformer,

A parking stand mounting step (c) of mounting the stand fixture (38) provided on the elbow insert (30) of claim 1 connected to the parking stand (16) by a construction switch (18) and a bypass cable (17)

Separating step (d) of separating the H1A, H2A, H3A side, A-phase, B-phase and C-phase elbow connection material 12 of the ground-level transformer using the elbow separator 20,

A connecting step (e) of connecting the separated elbow connecting member 12 to the elbow insert 30 mounted on the parking stand 16,

  An insulation cap mounting step (f) for connecting the insulation cap (22) to the bushing insert (11) on the H1A, H2A and H3A sides of the ground transformer (10)

(G) for confirming the live state of the spare transformer 19 by connecting the switch of the construction use switch 18,

The secondary side D1 of the replacement grounding transformer 10 and the secondary side D2 of the spare transformer 19 are connected in parallel and the secondary terminal D1 of the replacement grounding transformer is connected to the grounding transformer 10 for replacement, (H) of separating the secondary side terminal from the secondary side terminal separation step

An insulation plug installation step (i) for mounting the insulation plug 21 on the H1B, H2B, H3B side A, B, C phase parking stands 16,

(J) for connecting the elbow connecting members (12) of the H1B, H2B, and H3B to the elbow separator (20) and connecting them to the insulated plugs (21)

An elbow separator separation step (k) for separating the elbow separator (20) from the ground transformer (10)

(1) demolishing the ground transformer,

A step (m) of installing a new transformer to place the new transformer at the demolished ground transformer at the demolition stage,

(N) of inserting the insulation cap 22 on the primary side bushing insert of the new transformer,

A separator installing step (o) for installing the elbow separator (20) on the new transformer,

An insulating plug mounting step (p) for mounting the insulating plug (21) on the H1B, H2B, H3B side parking stand,

An elbow connecting step q for disconnecting the elbow connecting member 12 of the insulating plug 21 and then connecting the elbow connecting member 12 to the bushing inserts 11 on the H1B, H2B and H3B sides,

A terminal connection step (r) for connecting the terminal of the secondary terminal separation step (h) to the secondary side of the new transformer in parallel,

 (S) for checking the cut-off state of the spare transformer (19) by switching off the switch of the construction use switch (18)

An elbow insert 30 mounting step (t) for mounting the elbow insert (30) connected to the elbow connecting members (12) to the primary side A circuit for connection to the H1A, H2A and H3A parking stops,

An insert connection step (u) in which the elbow joints (12) are separated from the elbow insert (30) and connected to the H1A, H2A, and H3A side bushing inserts (11)

A separator disassembling step (v) for separating the elbow separator (20) from the new transformer,

And the above-described steps are sequentially performed.

The present invention as described above does not require expensive equipments such as junctions and uninterruptible power transformers which are currently used, and improves construction safety and minimizes equipments from many risk factors in case of uninterrupted construction.

In addition, it is easy to carry and assemble the equipment, simple parts configuration required for the work, there is no limitation on the work space, and the use method is simple, which can save construction time and drastically reduce the construction cost.

In addition, it is possible to utilize existing bypass cable, construction switch, and general transformer as it is, and by solving the problem that occurs when there is no allowance of cable when connecting the elbow joint to the elbow insert by making the bushing insert of the transformer equal to the projecting position, So that there is an effect of minimizing the contact between adjacent phases, thereby providing an excellent safety and workability.

1 is a perspective view showing a state in which an elbow separator is installed in a ground-type transformer;
Fig. 2 is a side view showing the essential structure of the elbow separator. Fig.
3 is an exploded view showing a state in which an elbow joint is connected to an elbow insert of the present invention.
4 is a cross-sectional view of an elbow insert;
5 is a side view showing a state in which the elbow insert is fixed to the parking stand of the transformer by eyebolts;
6 is a perspective view of an insulated plug;
7 is a perspective view of an insulating cap;
8 is a block diagram showing the operation sequence of the uninterruptible power supply method according to the present invention.
9 is a front view of the transformer;
10 is a front view of a state where an elbow insert is mounted on a parking stand of a transformer;
11 is a circuit diagram of the uninterruptible power supply of the present invention.
12A is an enlarged view of a portion T2 in Fig.
12B is an enlarged view of the TR portion of Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the elbow separator 20 shown in Figs. 1 and 2 is configured to safely disconnect and connect the elbow connecting member 12 used when the underground cable ascending in the ground state is connected to the transformer, only by operating the switch 52 It is one device.

The ground transformer 10 has a rectangular housing shape and a plurality of bushing inserts 11 are exposed on the front side and the underground cable 15 is connected to the elbow connecting member 12 to electrically connect the bushing insert 11 of the ground- Respectively.

One side of each of the bushing inserts 11 is provided with a parking stand 16 having a front "U" shape.

The elbow connecting member 12 is electrically connected to the inner terminal of the bushing insert 11 by the contact rod 14 exposed at the center so that the electric power of the underground cable 15 passes through the transformer inside the ground transformer 10 Pressure electricity to the customer.

The elbow separator 20 is attached in an assembled state for separating or reconnecting the elbow joint 12 to the front of the ground transformer 10. The structure and the role of the elbow separator 20 are already known in the Korean Patent No. 10-1674902 Detailed description thereof is omitted.

The present invention is electrically connected to the elbow connecting member 12 in a state where it is temporarily stood on the parking stand 16 for the replacement of the ground transformer 10 by uninterruption and is electrically connected to the receptacle 12 through the construction switch 18 and the spare transformer 19. [ And an uninterrupted power supply method using the elbow insert 30. In this case,

3 and 4, the conductor member 31 and the socket conductor 32, the arc-extinguishing member 33, the inner semiconductive member 35, And an insert insulator 36, an outer semiconductive member 37, and a stand fixture 38.

The conductor member 31 is electrically conductive material such as copper and has a high electrical conductivity. The bypass cable 17 connected to the construction switch 18 is electrically connected to the lower end of the conductor member 31.

A socket conductor 32 is fastened and fastened by screwing or the like so as to be electrically connected to the contact rod 14 of the elbow joint 12 in a direction substantially perpendicular to the upper end of the conductor member 31. [

A guide hole 34 is drilled at the tip end of the socket conductor 32 so that the contact rod 14 is inserted and removed. An arc-like member 33 made of an insulating material is positioned.

When the elbow joint 12 is assembled with an insulating material made of synthetic resin or Teflon material, the arc-extinguishing member 33 guides the movement position of the contact rod 14 when the contact bar 14 is electrically connected to the socket conductor 32.

In addition, the contact rod 14 of the elbow connecting member 12 protects against the generation of sparks due to a high-voltage current following the separation from the socket conductor 32.

The outer surface of the arc-extinguishing member 33, the socket conductor 32 and the outer surface of the conductor member 31 is covered with an inner semi-conductive member 35 having a predetermined thickness. And the mold is maintained in the "a" shape.

On the other hand, a part of the outer side of the insert insulator 36 is enclosed by the outer semi-conductive member 37 of a certain thickness and guided to be grounded when an abnormal current is generated.

The semiconductive material consists of semiconductive rubber or semiconductive silicone material with a certain thickness to fill the space between the conductor and the insulator, to suppress partial discharge, and to relax the electric field.

A stand fixture 38 for fixing the position of the insert body 30 to the parking stand 16 is provided at one upper end.

  A groove portion of a stand fixture 38 recessed in a U-shaped parking stand 16 is fitted and mounted. In order to fix the position without completely moving, the stand fixture 38 is provided with an eye bolt 39 Is screwed.

5, when the eye bolt 39 is advanced toward the wall surface of the ground transformer 10, the stand fixture 38 strongly urges the parking stand 16 to closely contact the flow of the insert body 36 And a solid installation can be achieved.

A method for replacing the uninterruptible ground-based transformer using the elbow insert 30 having the above-described configuration will be described below.

First, after confirming the loop condition of the line, it is checked whether there is any abnormality such as the fixing and deterioration state of the elbow connection member 12, the bushing, the terminal, the oil thermometer or the oil level system, .

An elbow separator installing step (b) for mounting the elbow separator (20) on the upper portion of the outer casing of the ground transformer (10) judged to be necessary is carried out.

The elbow separator 20 is used to attach or detach the elbow joint 12 to the bushing insert 11 and the elbow insert 30 by the operation of the switch 52 and its construction and operation method are already known.

Then, a parking stand mounting step (c) for mounting the stand fastener (38) provided on the body (30) of the elbow insert (30) to the parking stand (16) is performed.

The bypass cable 17 electrically connected through the conductor member 31 of the elbow insert 30 is connected to the construction switch 18.

The construction switch 18 is electrically connected to the general transformer 19 and is wired so as to be able to supply power to the customer.

(D) for separating the C-phase, B-phase, and A-phase elbow connection members 12 in the order of H3A, H2A and H1A of the ground-level transformer 10 using the elbow separator 20 .

The connecting step e is performed to connect the elbow connecting members 12 separated in the above step to the elbow inserts 30 mounted on the parking stand 16 with the elbow separator 20 respectively.

At this time, the insulating caps 22 are connected to the bushing inserts 11 on the H1A, H2A, and H3A sides of the ground-level transformer 10 using the elbow separator 20, respectively.

The insulating cap 22 covers the bushing insert 11 exposed by the cap structure of a rubber material or a synthetic resin material, thereby protecting the bushing insert 11 from various hazards during operation.

After performing the live-line checking step (g) for confirming the live state of the spare transformer 19 by connecting the switch of the construction use switch 18, the secondary side D1 of the replacement ground- A secondary terminal separation step (h) of connecting the secondary (D2) side of the transformer 19 in parallel and disconnecting the secondary terminal D1 of the replacement ground transformer 10 from the replacement ground transformer 10 Should be done.

Next, an insulation plug 21 mounting step (i) for mounting the insulation plug 21 on the H1B, H2B, H3B side A, B, and C phase parking stands of the replacement ground transformer 10, and H1B, H2B And then connecting the elbow joint members 12 of the H3B side to the elbow separator 20 and sequentially connecting the insulation plugs 21 to the insulation plugs 21, (K) for separating the transformer (10) from the transformer (10) to be replaced.

A demolishing step (1) is carried out to demolish the ground transformer (10) which has been prepared for demolition by the above steps from the installation position.

After completing this demolition step (l), the installation phase of the new new transformer is continued.

That is, following the step (m) of installing a new transformer to place the new transformer at the position where the ground transformer is demolished in the demolishing step (1), the step (n) of inserting the insulation cap 22 to the primary side bushing insert 11 of the new transformer ).

An insulation plug 21 for mounting the insulation plug 21 to the H1B, H2B, and H3B side parking stands 16, respectively, following the separator installation step m for installing the elbow separator 20 on the upper housing of the new transformer, A mounting step (p) is performed.

An elbow connecting step q for disconnecting the elbow connecting member 12 of the insulating plug 21 and connecting the elbow connecting member 12 to the bushing inserts 11 on the side of H1B, H2B and H3B,

A terminal connection step (r) for connecting the terminal of the secondary terminal separation step (h) to the secondary side of the new transformer in parallel,

 (S) for checking the cut-off state of the spare transformer (19) by switching off the switch of the construction use switch (18)

An elbow insert mounting step (t) for mounting the elbow insert 30 connected to the elbow connecting members 12 to the primary side A circuit for power connection to the H1A, H2A, H3A side parking stand 16 is performed.

Subsequently, an insert connection step (u) is performed in which the elbow joints 12 are separated from the elbow insert 30 and connected to the bushing inserts 11 on the H1A, H2A and H3A sides, respectively. After completion of the separator disassembling step (v) for separating the already installed elbow separator 20 from the newly installed transformer, the replacement and installation process of the transformer is completed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. will be.

The present invention is applied to the field of connection and connection of live elbow joints for ground transformers. Especially, it is applied to the uninterruptible replacement technology which is required to prevent safety accidents caused by uninterrupted replacement, shorten the working time, and be accurate.

10 - Replacement ground transformer 11 - Bushing insert
12 - Elbow connection for transformer 14 - Contact rod
17 - Bypass cable 18 - Construction switch
19 - Spare transformer 20 - Elbow separator
21 - Insulation plug 22 - Insulation cap
30 - elbow insert body 31 - conductor member
32 - Socket conductor 33 - Arc core member
35 - inner semiconductive member 36 - elbow insert insulating member
36 - outer semiconductive member 38 - stand fixture

Claims (3)

A plurality of elbow connecting members 12 to which the contact rod 14 is electrically connected to the inside of the bushing insert 11 exposed in the front surface in the shape of a housing and a plurality of elbow connecting members 12 for connecting the grounding transformer 10 with the parking stems 16, In the insert;
The elbow insert (30) has a conductor member (31) to which a bypass cable (17) connected from a construction switch (18) is electrically connected,
A socket conductor 32 fixedly positioned in a direction perpendicular to the upper end of the conductor member 31,
An arc-extinguishing member 33 made of an insulating material and having a guide hole 34 pierced so that the contact rod 14 of the elbow connecting member 12 goes in and out of the socket conductor 32,
An inner semiconductive member 35 surrounding the outside of the socket conductor 32 and the arc soffit member 33,
An insert insulating member 36 which surrounds the conductor member 31, the socket conductor 32, the arc soffit member 33 and the outer side of the inner semi-
And an outer semiconductive member 37 which surrounds the outer surface of the insert insulator 36 and induces grounding when an abnormal current is generated,
And a stand fastener (38) installed on the rear side of the elbow insert (30) and fixed in position by being caught by the parking stand (16).
2. The ground transformer according to claim 1, wherein the stand fixture (38) further comprises an eye bolt (39) for preventing the elbow insert body (30) from flowing toward and away from the wall surface of the ground transformer Mountable Elbow Insert.
After confirming the condition of the line loop, the step (a) of confirming the state of the ground transformer for replacement,
An elbow separator installation step (b) for installing the elbow separator (20) in a ground transformer,
A parking stand mounting step (c) of mounting a stand fixture (38) provided on the body of the elbow insert (30) of claim 1 connected to the parking stand (16) by a construction switch (18) and a bypass cable (17)
(D) for separating the H3A, H2A, H1A side, and C-phase elbow connecting member 12 of the ground-level transformer using the elbow separator 20,
A connecting step (e) of connecting the separated elbow connecting member 12 to the elbow insert 30 mounted on the parking stand 16,
An insulation cap mounting step (f) for connecting the insulation cap (22) to the bushing insert (11) on the H1A, H2A and H3A sides of the ground transformer (10)
(G) for confirming the live state of the spare transformer 19 by connecting the switch of the construction use switch 18,
The secondary side D1 of the replacement grounding transformer 10 and the secondary side D2 of the spare transformer 19 are connected in parallel and the secondary terminal D1 of the replacement grounding transformer is connected to the grounding transformer 10 for replacement, (H) of separating the secondary side terminal from the secondary side terminal separation step
(I) for inserting an insulation plug 21 on the H1B, H2B, and H3B side A, B, and C phase parking stands 16,
(J) for connecting the elbow connecting members (12) of the H1B, H2B, and H3B to the elbow separator (20) and connecting them to the insulated plugs (21)
An elbow separator separation step (k) for separating the elbow separator (20) from the ground transformer (10)
(1) demolishing the ground transformer,
A step (m) of installing a new transformer to place the new transformer at the demolished ground transformer at the demolition stage,
The step (n) of installing the insulation cap 22 on the primary side bushing insert 11 of the new transformer,
A separator installing step (o) for installing the elbow separator (20) on the new transformer,
An insulation plug mounting step (p) for mounting the insulation plug (21) on the H1B, H2B, H3B side parking stand,
An elbow connecting step q for disconnecting the elbow connecting member 12 of the insulating plug 21 and then connecting the elbow connecting member 12 to the bushing inserts 11 on the H1B, H2B and H3B sides,
A terminal connection step (r) for connecting the terminal of the secondary terminal separation step (h) to the secondary side of the new transformer in parallel,
(S) for checking the cut-off state of the spare transformer (19) by switching off the switch of the construction use switch (18)
An elbow insert mounting step (t) for mounting the elbow insert connected to the elbow joints to the primary side A circuit for power connection to the H1A, H2A, H3A side parking stand,
An insert connection step (u) in which the elbow joints are separated from the elbow insert and connected to the H1A, H2A, and H3A side bushing inserts respectively,
A separator disassembling step (v) for separating the elbow separator (20) from the new transformer,
The uninterrupted method using the elbow insert according to claim 1, wherein the steps are sequentially performed.

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