KR20230000183A - 1-Phase unit transformer module and Phase exchangeable transformer having the same - Google Patents

Abstract

A 1-phase unit transformer module is disclosed that, when 1 or 2 phases are damaged during operation, can be replaced using a 1-phase transformer in which only the damaged phase is secured, rather than replacing the entire box-integrated 3-phase ground transformer like in existing devices. The 1-phase unit transformer module comprises a housing; a transformer tank installed in the housing and filled with insulating oil; a fuse system installed in the transformer tank or in the housing; one transformer coil connected to the fuse system; an elbow connector connected to the fuse system; an application terminal connected to the input terminal of the transformer coil; an output terminal connected to the other end of a cable, one end of which is connected to an elbow connector, and a contact terminal connected to the output terminal of the transformer coil and protruding.

Description

1-Phase unit transformer module and Phase exchangeable transformer having the same}

The present invention relates to a land transformer, and more particularly, to a 1-phase unit transformer module and a phase-swappable ground transformer having the same.

Looking at a conventional transformer, a voltage of 22.9 kV from a substation is reduced to 220/380V in a transformer through a distribution line, and then power is supplied to each customer. In general, overhead transformers are used in processing areas and ground transformers are used in underground areas.

The transformer is a device that functions to convert the received voltage into a voltage suitable for the operation of the load facility, and the three-phase ground transformer, excluding the single-phase ground transformer used for underground distribution lines, is composed of an integrated enclosure. In addition, insulating oil and a current-limiting fuse, which is a protective device, are built-in, so if one phase burns out, not only the enclosure but also the entire integrated 3-phase transformer must be replaced.

When one or two phases are burnt out, replacing the entire three-phase transformer takes a lot of time, and customers who use one of the three phases inevitably experience a power outage, resulting in civil complaints. In addition, since the volume of the three-phase ground transformer is large and the equipment price is high, it is difficult to secure and store a lot of spares, and it is impossible to store it for a long time due to the huge investment cost due to replacement and elongation.

Up to now, there is no ground transformer in which only one phase of a three-phase ground transformer can be replaced when only one phase is burnt out.

1. Korea Patent Publication No. 10-2011-0003904

The present invention has been proposed to solve the problems caused by the above background art, and when one or two phases are burnt out during operation, the entire enclosure-integrated three-phase ground transformer is not replaced as in existing devices, and only the burnt phase is secured by using a single-phase transformer. The purpose is to provide a ground transformer that can be replaced by

In addition, the present invention is to provide a ground transformer that can be insulated when in contact by attaching a transformer enclosure lid, and can be individually connected and separated by manufacturing an enclosure enclosure so that the low voltage and separation 1-phase transformers can enter, respectively. there is

In order to achieve the problem presented above, the present invention is a 1-phase transformer that can be replaced by using a 1-phase transformer with only the burnt phase secured without replacing the entire enclosure-integrated 3-phase ground transformer like existing devices when one or two phases are burnt out during operation. A phase unit transformer module is provided.

The one-phase unit transformer module,

housing;

a transformer tank installed in the housing and filled with insulating oil;

a fuse system installed in the transformer tank or in the housing;

One transformer coil connected to the fuse system;

an application terminal having one end connected to the cable and the other end connected to the input end of the transformer coil;

an output terminal connected to an output terminal of the transformer coil; and

and a contact terminal connected to the output terminal of the transformer coil and protruding.

At this time, the fuse system includes a BioNet fuse connected to an input terminal of one of the transformer coils; and a current-limiting fuse having one end connected to the BioNet fuse and the other end connected to the elbow connector.

In addition, the contact terminal is characterized in that formed to protrude on the lower surface of the housing.

In addition, it is characterized in that it comprises a; protective cover covering the outer surface of the housing.

In addition, the protective cover may include a left cover based on a vertical central axis of the housing; and a right cover detachably coupled to the left cover) through a fastening part.

At this time, the fastening part is characterized in that a protrusion formed on one of the left cover and the right cover and a groove formed on the other one to match the protrusion.

In addition, a first hole for a partial protruding portion of the Bionet fuse and a second hole for a protruding portion of an application terminal or an output terminal are formed on a surface of the left cover or the right cover.

On the other hand, another embodiment of the present invention, the enclosure forming the appearance; An inner box into which the detachable one-phase unit transformer module described above is inserted into the outer box; a lid for opening and closing the top surface of the inner box; and a low voltage unit arranged in parallel in the inner box and outputting power converted by the 1-phase unit transformer module.

At this time, the inner box is characterized in that it is composed of three partition blocks in which an insertion space in which the one-phase unit transformer module is inserted and seated is formed.

In addition, the top surface and the front surface of the inner box are characterized in that they have an open structure.

In addition, one side of the lid is characterized in that the hinge is coupled to the outer peripheral surface of the enclosure.

In addition, a connection part connected to the contact terminal of the one-phase unit transformer module is installed on the lower surface of the inner box.

In addition, the connection part is characterized in that it consists of three connecting elbows respectively connected to the lower surfaces of the three partition blocks.

In addition, connection terminals are installed on each of the three connecting elbows, and the connection terminals are characterized in that they are connected to a conduit for connection with the low voltage unit.

In addition, a leg is installed on the lower end surface of the inner box so that the lower end surface of the inner box is kept spaced apart from the inner bottom surface of the enclosure at a predetermined first height.

In addition, a leg is installed on the lower end surface of the low pressure part so that the lower end surface of the low pressure part is maintained at a constant second height from the inner bottom surface of the enclosure.

In addition, it is characterized in that a partition wall is installed between the inner box and the low pressure part.

According to the present invention, when one or two phases of the power supply are burned out, instead of replacing the entire enclosure-integrated three-phase ground transformer like existing devices, only the burnt out phases are secured by replacing the one-phase transformer, reducing the time required for replacement, reducing costs, and civil complaints effective in relieving

In addition, as another effect of the present invention, it has a rectangular shape, and is manufactured to insulate (flame-retardant synthetic rubber material or an insulating material lid having characteristics equal to or greater than that) when in contact by attaching a 1-phase transformer enclosure lid, and the main body, 3 It can be mentioned that the phase transformer enclosure is made of an existing material (iron) enclosure and manufactured so that the low voltage section and the separation 1-phase transformer can be individually connected and separated.

In addition, another effect of the present invention is that it can be used as a replacement for the same other phase by securing materials for a single-phase transformer, and it is possible to secure only a single-phase transformer, so it is efficient during transportation and storage.

1 is a conceptual diagram of a phase-swappable land transformer according to an embodiment of the present invention.
FIG. 2 is a plan view of the land transformer shown in FIG. 1 when the cover is opened.
FIG. 3 is a plan view of the land transformer shown in FIG. 1 when the lid is closed.
FIG. 4 is a view showing a detachable 1-phase unit transformer module attached to and detached from the partition block of the land transformer shown in FIG. 1 .
5 is a bottom plan view of the ground transformer shown in FIG. 1;
6 is a front view of the land transformer shown in FIG. 1;
7 is a flowchart illustrating an operation process of a phase interchangeable land transformer according to an embodiment of the present invention.
8 is an insulation conceptual diagram of a 1-phase unit transformer module according to another embodiment of the present invention.
FIG. 9 is a view showing a state in which a protective cover is separated from the 1-phase unit transformer module shown in FIG. 8 .

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

In describing each figure, like reference numbers are used for like elements. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. The term "and/or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this application, it should not be interpreted in an ideal or excessively formal meaning. Should not be.

Hereinafter, with reference to the accompanying drawings, a one-phase unit transformer module according to an embodiment of the present invention and a phase-swappable ground transformer having the same will be described in detail.

1 is a conceptual diagram of a phase-swappable land transformer 100 according to an embodiment of the present invention. Referring to FIG. 1, the phase changeable land transformer 100 includes an enclosure 101 forming an exterior, an inner enclosure 120 detachably inserting a 1-phase unit transformer module (not shown) in the enclosure 101, It is configured to include a lid 110 that opens and closes the top surface of the inner box 120, a low pressure unit 130 disposed in parallel to the inner box 120, and the like.

The enclosure 101 has a rectangular shape and is open toward the upper end and integrally sealed toward the lower end. In addition, as the material of the enclosure 101, a metal material such as steel may be used to maintain stability from an impact applied to the exterior. Of course, non-ferrous metals such as aluminum alloys, plastic engineering, and the like may also be used.

The lid 110 serves to open and close the top surface of the inner case 120 . For such opening and closing, one side of the lid 110 may be hinged to the outer circumferential surface of the enclosure 101 . Of course, it is also possible to have a rectangular plate type without hinged coupling. As the material of the lid 110, a flame retardant synthetic rubber material or an insulating material having characteristics equal to or greater than this may be used. The lid 110 may be composed of first to third sub lids 111 , 112 , and 113 to open and close each partition block 121 , 122 , and 123 of the inner case 120 . Of course, although shown in Figure 1 as three sub-lids (111, 112, 113), it may be composed of one lid (110).

The inner box 120 is divided into three sections so that each one-phase unit transformer module is inserted, and an insertion space 120-1 is formed inside. In other words, the inner box 120 is partitioned into first to third partition blocks 121 , 122 , and 123 .

In addition, the upper end of the inner box 120 has an open structure, and the front surface of the inner box 120 also has a partially open structure.

The inner box 120 has a structure in which a one-phase unit transformer module is inserted and seated, and a metal material is used for stability.

A three-phase high-voltage unit is formed by inserting and connecting a one-phase unit transformer module (not shown) to the first to third partition blocks 121, 122, and 123 composed of the inner box 120, respectively. The 3-phase high voltage part receives a high voltage of about 22.9k and converts it to a low voltage of about 220~380V.

The low voltage unit 130 receives the low voltage generated through the high voltage unit and supplies power to the outside. To this end, low voltage terminals (x0 to x3) 131 may be configured on the front side.

A connection part 140 connected to a 1-phase unit transformer module (not shown) is formed on the lower surface of the inner box 120 . The connecting part 140 is composed of first to third connecting elbows 141, 142, and 143, the first connecting elbow 141 is installed on the bottom surface of the first partition block 121, and the second connecting elbow 142 is It is installed on the lower surface of the second partition block 122, and the third connecting elbow 143 is installed on the lower surface of the third partition block 123.

The first to third connecting elbows 141 , 142 , and 143 are provided with connection terminals 170 . Of course, the first connecting terminal 171 is configured on the first connecting elbow 141, the second connecting terminal 172 is configured on the second connecting elbow 142, and the third connecting elbow 143 is configured on the third connecting elbow 143. A connection terminal 173 is configured.

The first to third connection terminals 171 to 173 are connected to the conduit 150 . The conduit 150 is connected to the low-voltage inlet 103 installed in the low-voltage part 130, and the low-voltage inlet 103 is connected to the low-voltage terminal 131. The conduit 150 performs a function of being connected to the low voltage part 130 through a connecting elbow by lowering 22.9 kV to 220/380 V through a transformer consisting of a one-phase unit transformation module by applying power from a high voltage. Of course, wires are formed for each phase in the conduit 150, and each wire is covered for insulation.

On the other hand, the lower surface of the inner box 120 is maintained within the enclosure 101 at a constant height from the inner bottom surface of the enclosure 101. To this end, a leg 161 is formed on the lower surface of the inner box 120. The leg 161 may be integrally formed with the inner box 120 or may be configured separately. Leg 161 may be a rectangular plate.

Of course, the leg 162 is also formed on the bottom surface of the low pressure part 130. Therefore, the lower surface of the low pressure part 130 is maintained within the enclosure 101 at a constant height from the inner bottom surface of the enclosure 101 .

A ground terminal 180 for grounding the 1-phase unit transformer module (not shown), the low voltage unit 130, and the enclosure 101 is configured.

FIG. 2 is a plan view of the land transformer 100 shown in FIG. 1 showing a case in which the lid 110 is opened. Referring to FIG. 2 , three one-phase unit transformer modules may be inserted. In other words, phase A is the first partition block 121, phase B is the second partition block 122, and phase C is the third partition block 123. Of course, a 1-phase unit transformer module is inserted and installed in each partition block.

In addition, a partition wall 210 is installed between the inner box 120 and the low pressure part 130 to prevent electrical disturbance and water leakage between each other.

FIG. 3 is a plan view of the land transformer 100 shown in FIG. 1 when the lid 110 is closed. Referring to FIG. 3 , first to third sub lids 111 , 112 , and 113 are configured to open and close the first to third partition blocks 121 , 122 , and 123 of the inner box 120 . Of course, as described above, it may also consist of a single lid.

FIG. 4 is a view showing a detachable 1-phase unit transformer module 400 attached to and detached from the partition blocks 121 , 122 , and 123 of the land transformer 100 shown in FIG. 1 . Referring to FIG. 4, the one-phase unit transformer module 400 includes a housing 401, a transformer tank 410 installed in the housing 401 and filled with insulating oil, and a fuse system installed in the transformer tank 410 ( 411), one transformer coil 413 connected to the fuse system 411, an application terminal 420-1 having one end connected to the fuse system 411 and a cable 450 connected to the other end, a transformer coil It may include an output terminal 420-2 connected to the output terminal 413, and a contact terminal 460 connected to the output terminal of the transformer coil 413 and protruding. The application terminal 420-1 receives a voltage of 22.9 kV from a substation and a ground switch through an underground cable (not shown). The output terminal 420-2 serves to supply power to another transformer or switch.

A material of the housing 401 may be a metal material such as steel.

The fuse system 411 may include a BioNet fuse 411-1 and a current-limiting fuse 411-2. The BioNet fuse 411-1 is a dual fuse and may be connected to both the transformer coil 413 and the current limiting fuse 411-2. In other words, the bayonet fuse 411-1 is connected to the input terminal of the transformer coil 413. In addition, the current limiting fuse 411-2 has one end connected to the Bionet fuse 411-1 and the other end connected to the applying terminal 420-1.

The contact terminal 460 is formed to slightly protrude on the lower surface of the housing 401 . In other words, the contact terminal 460 is a rectangular conductive terminal and contacts the connecting elbows 141, 142, and 143 while the 1-phase unit transformer module 400 is seated in the insertion space (120-1 in FIG. 1). In the same way as the principle of the wireless kettle connection device (the connection method between the heating wire terminal at the bottom of the kettle and the pedestal terminal connected to the wire), the contact terminal 460 and the surfaces of the elbow connecting elbows 141, 142, and 143 are electrically contacted.

Of course, the connecting elbows 141 , 142 , and 143 are installed in grooves that slightly enter from the bottom surface of the inner case 120 . Of course, this groove has a similar rectangular shape to be matched with the contact terminal 460. In addition, as long as the shape of the contact terminal 460 and the groove are not limited to a rectangle, various shapes are possible.

5 is a lower planar portion of the ground transformer shown in FIG. 1; Specifically, it is a plan view of the inner box 120. Referring to FIG. 5 , connecting elbows 141 , 142 , and 143 are installed on the outer circumferential surface of the lower end of the inner case 120 , and the connecting elbows 141 , 142 , and 143 are electrically connected to the contact terminal 460 .

FIG. 6 is a front view of the land transformer 100 shown in FIG. 1 . In other words, detachable one-phase unit transformer modules 400 are inserted into all three partition blocks 121, 122, and 123 shown in FIG. In this case, each phase is connected to the application terminals (H1A, H2A, H3A) to be pressurized, and the output terminals (H1B, H2B, H3B) are branched to other switchgear or transformer power supply side.

7 is a flowchart showing an operation process of the phase-swappable land transformer 100 according to an embodiment of the present invention. Referring to FIG. 7 , applying terminals H1A, H2A, and H3A are connected to high-voltage elbow connectors, and a high-voltage pressure is applied to each phase unit transformer module (step S710).

Thereafter, the high-voltage voltage is converted to the low-voltage voltage by passing through a protection device (ie, the fuse system 411) built in each phase transformation module (step S720). To elaborate, the transformer 100 is protected from high-voltage faults by first passing through the current limiting fuse 411-2 and secondly passing through the Bionet fuse 411-1, and the 22.9 kV voltage is passed through the transformer coil 413. converts to 220V/380V.

The Bionet fuse 411-1 may include a fuse holder and a dual element fuse link inserted into the fuse holder.

Thereafter, the 22.9 kV voltage is converted to 380 V through the transformer coil 413 to generate a low voltage voltage, and then the low voltage voltage is connected to the lower terminal of the 1-phase transformer module 400 (ie, the contact terminal 460) and the inner box ( The connection part 140 attached to 120 is connected to the low pressure part 130 through the conduit 150 (step S730).

Thereafter, the low voltage is applied through the conduit 150 connected to the low voltage unit 130 and supplied to consumers by connecting a low voltage cable (not shown) to the low voltage terminals (x0 to x3) 131 (step S740).

Thereafter, only the damaged 1-phase transformer module 400 is separated from the inner box 120 (step S750). Of course, after separation, a process of replacing with a new one-phase transformer module is performed. After replacement, insert it as it is, connect the high-voltage cable, and supply operating power to the ground transformer.

8 is an isolation conceptual diagram of a 1-phase unit transformer module 400 according to another embodiment of the present invention. Referring to FIG. 8 , in order to move and replace the 1-phase unit transformer module 400, it is necessary to maintain an insulation state and to protect it from static electricity. For this purpose, a protective cover 810 is used. That is, the outer surface of the housing 401 is covered using the protective cover 810 . Of course, insulating oil or solid insulator may be used inside the 1-phase unit transformer module 400 .

An insulating material is used to electrically insulate the protective cover 810 . A thermosetting resin may be used as an insulating material. The curable resin may be an epoxy resin, a phenol resin, a urea resin, a melamine resin, an unsaturated polyester resin, a polyurethane resin, or the like. Of course, a flame retardant synthetic rubber material or an insulating material having properties equal to or better than this may be used.

FIG. 9 is a view showing a state in which the protective cover 810 is separated from the 1-phase unit transformer module 400 shown in FIG. 8 . Referring to FIG. 9 , the protective cover 810 includes a left cover 910-1 and a right cover 910-2 detachably coupled to the left cover 910-1 with respect to the vertical central axis of the housing 401. consists of Of course, a fastening portion 901 for coupling is formed on the left cover 910-1 or the right cover 910-2. The fastening part 901 is formed with a protrusion and a groove that matches the protrusion. The protrusions and grooves are rectangular in shape, but other shapes are possible.

In addition, on the surface of the left cover 910-1 or the right cover 910-2, a first hole 902 for a partial protrusion of the Bionet fuse 411-1, an application terminal 420-1 or an output terminal A second hole 903 for the protrusion of 420-2 is formed. In other words, in the case of the BioNet fuse 411-1, the portion connected to the transformer coil 413 and the current limiting fuse 411-2 is made within the transformer tank 410, but the other portion is the surface of the housing 401. protrudes from Therefore, a first hole 902 is formed for this purpose.

100: phase interchangeable ground transformer
110: lid
111 to 113: first to third sub lids
120: Inner box
121 to 123: first to third partition blocks
130: low pressure part
140: connection part
141 to 143: first to third connecting elbows
150: conduit
170: connection terminal unit
171 to 173: first to third connection terminals
161,162: legs
210: bulkhead
400: 1-phase unit transformation module
401: housing 410: transformer tank
411: fuse system 413: transformer coil
420-1: application terminal 420-2: output terminal
460: contact terminal

Claims (16)

housing 401;
a transformer tank 410 installed in the housing 401 and filled with insulating oil;
a fuse system 411 installed in the transformer tank 410 or the housing 401;
One transformer coil 413 connected to the fuse system 411;
an application terminal 420-1 having one end connected to the cable 450 and the other end connected to the input terminal of the transformer coil 413;
an output terminal 420-2 connected to an output terminal of the transformer coil 413; and
a contact terminal 460 that is connected to the output end of the transformer coil 413 and protrudes;
One-phase unit transformer module, characterized in that it comprises a.
According to claim 1,
The fuse system 411,
a Bionet fuse 411-1 connected to an input end of one of the transformer coils 413; and
A one-phase unit transformer module comprising a current limiting fuse 411-2 having one end connected to the Bionet fuse 411-1 and the other end connected to the application terminal 420-1.
According to claim 1,
The 1-phase unit transformer module, characterized in that the contact terminal 460 is formed to protrude on the lower surface of the housing 401.
According to claim 2,
A one-phase unit transformer module characterized in that it comprises a; protective cover 810 covering the outer surface of the housing (401).
According to claim 4,
The protective cover 810,
a left cover 910-1 based on the vertical central axis of the housing 401;
and a right cover 910-2 detachably coupled to the left cover 910-1 through a fastening part 901, wherein the fastening part 901 connects the left cover 910-1 and the right cover 910-2. A one-phase unit transformer module characterized in that a protrusion formed on one of the right covers 910-2 and a groove formed on the other one to match the protrusion are formed.
According to claim 5,
On the surface of the left cover 910-1 or the right cover 910-2, a first hole 902 for a partial protrusion of the Bionet fuse 411-1 and an application terminal 420-1 or an output A one-phase unit transformer module characterized in that a second hole 903 is formed for the protruding portion of the terminal 420-2.
Enclosure 101 forming the exterior;
An inner box 120 into which the detachable one-phase unit transformer module 400 according to any one of claims 1 to 6 is inserted into the enclosure 101;
a lid 110 for opening and closing the top surface of the inner box 120; and
a low voltage unit 130 disposed in parallel to the inner box 120 and outputting power converted by the 1-phase unit transformer module;
Phase interchangeable ground transformer, characterized in that it comprises a.
According to claim 7,
The inner box 120 is composed of three partition blocks 121, 122, and 123 in which an insertion space 120-1 in which the one-phase unit transformer module 400 is inserted and seated is formed. According to claim 7,
The upper surface and the front surface of the inner box 120 have an open structure.
According to claim 7,
One side of the lid 110 is a phase interchangeable ground transformer, characterized in that hinged to the outer circumferential surface of the enclosure (101).
According to claim 7,
Phase interchangeable ground transformer, characterized in that the connection portion 140 connected to the contact terminal 460 of the 1-phase unit transformation module 400 is installed on the lower surface of the inner box 120.
According to claim 11,
The connection part 140 is composed of three connecting elbows 141, 142, and 143 connected to the lower surfaces of the three partition blocks 121, 122, and 123, respectively.
According to claim 12,
Connection terminals 171, 172, 173 are installed on the three connecting elbows 141, 142, and 143, respectively, and the connection terminals 171, 172, and 173 are connected to the conduit 150 for connection with the low-pressure part 130. ground transformer.
According to claim 7,
The lower surface of the inner box 120 is interchangeable, characterized in that the leg 161 is installed so that the lower surface of the inner box 120 is kept spaced apart from the inner bottom surface of the enclosure 101 at a predetermined first height. type ground transformer.
According to claim 7,
Characterized in that the leg 161 is installed on the lower surface of the low pressure part 130 so that the lower surface of the low pressure part 130 is maintained at a constant second height from the inner bottom surface of the enclosure 101 Interchangeable ground transformer.
According to claim 7,
A phase interchangeable ground transformer, characterized in that a barrier 210 is installed between the inner box 120 and the low voltage part 130.

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