KR102166906B1 - Ring main unit - Google Patents

Abstract

Provided is a ring main unit which can promote overall miniaturization. The ring main unit comprises: a main body in which an accommodation space with one side open is formed; a first bushing including a first conductor disposed in the accommodation space and disposed in the accommodation space; a second test busing including a second conductor disposed in the accommodation space and disposed in the accommodation space to be spaced apart from the first test bushing; a third test bushing including a third conductor disposed in the accommodation space and disposed in the accommodation space between the first test bushing the second test bushing not to be disposed in a virtual line or surface formed by the first test busing and the second test bushing; and a fourth conductor electrically connected to the third conductor and disposed in the virtual line or surface formed by the first test busing and the second test bushing.

Description

Ring Main Unit {RING MAIN UNIT}

The present invention relates to a ring main unit having an improved structure of a test bushing.

The Ring Main Unit (RMU) is a power device that has the main function of receiving power from the power system and distributing it to the customer, monitoring abnormalities in the power system, remote control, and protecting the load side from power accidents.

In this ring main unit, circuit breakers, switchgear, grounding devices and conductors are built in a structure that is hermetically insulated by SF6 gas. Therefore, since the ring main unit is an important device in several distributions, insulation performance must be secured.

Republic of Korea Patent Registration No. 10-1865474 (name of the invention: interlock device of the ring main unit) discloses the technical idea of such a ring main unit.

Looking at the prior art with the above registered patent, the main bushing 20 is disposed on the main body 100 so that power distribution to the customer can be performed.

In addition, test bushings 200 to 500 are disposed on one side of the main body 100 to perform an insulation performance test such as a withstand voltage test or a lightning impulse test of the ring main unit.

Specifically, for the insulation performance test, when the main bushing 20 is grounded, the door part 200 of the space in which the test bushing 310 is placed is opened, and the insulation performance by connecting a terminal to the test bushing 310 Conduct the test.

On the other hand, a ground part 300 is disposed inside the door part 200 so that the terminal of the test bushing 310 is energized, and the test bushing 310 is opened when the door part 200 is closed. Ground it.

However, as shown in the conventional test bushing 310, three are arranged on the same line in a straight line, and in this case, since they are arranged to be spaced apart from each other at predetermined intervals to avoid mutual interference, the overall height or width of the ring main unit increases. There is a problem.

The present invention has been conceived to solve the above problems, and an object of the present invention is to provide a ring main unit capable of miniaturization as a whole by improving the arrangement structure of the test bushing.

Another object of the present invention is to provide a ring main unit having an improved terminal structure so as to simplify the grounding structure of the test bushing.

Another object of the present invention is to provide a ring main unit having an improved interlock structure according to the structural improvement of the test bushing.

In order to achieve the above object, the present invention includes: a main body having an open receiving space on one side; A first test bushing disposed in the receiving space and including a first conductor disposed in the receiving space; A second test bushing disposed in the receiving space to be spaced apart from the first test bushing by a predetermined distance and including a second conductor disposed in the receiving space; The accommodation space between the first test bushing and the second test bushing so as not to be disposed on a virtual line or surface formed by the first test bushing and the second test bushing including a third conductor disposed in the accommodation space A third test bushing disposed on the; And a fourth conductor electrically connected to the third conductor and disposed on an imaginary line or surface formed by the first conductor and the second conductor.

In addition, it may further include a bus bar for electrically connecting the third conductor and the fourth conductor.

In addition, the ring main unit may include a door disposed on the body to open and close the accommodation space; And a grounding portion disposed on the inner side of the door and electrically connected to the first conductor, the second conductor, and the fourth conductor when the door is closed.

In addition, the ring main unit may further include a ground wire having one end electrically connected to the ground portion and the other end electrically connected to a ground terminal of the main body disposed in the accommodation space.

In addition, the ground portion bracket fixed to the inner surface of the door; At least one supporter fixed to the bracket so as to be disposed in a space between the first conductor, the second conductor, and the fourth conductor when the door is closed; A pair of blades fastened to face each other to the supporter and electrically connected to the first conductor, the second conductor, and the fourth conductor when the door is closed; And at least one leaf spring disposed on an outer surface of each of the pair of blades.

In addition, the ring main unit includes an operation hole formed in the main body; A grounding device disposed inside the main body and having a handle insertion hole through which an operation handle capable of operating whether or not the main ground can be fastened at a position corresponding to the operation hole; And an interlock unit that closes the operation hole when the door is opened and opens the operation hole when the door is closed.

In addition, the interlock unit may include a pressing protrusion formed on one side of the door; An interlock bar comprising a body arranged to be translatable on the grounding device, a contact end extending from one end of the body to contact the pressing protrusion, and a shield end selectively opening and closing the operation hole at the other end of the body ; And at least one or more springs having one end connected to the interlock bar and the other end connected to the grounding device.

In addition, at least one long hole horizontal to the translation direction is formed in the body, and the interlock unit may further include a guide bolt that passes through the long hole and is fastened to the grounding device.

On the other hand, the present invention is a main body in which one side is open receiving space; A first test bushing disposed in the receiving space and including a first conductor disposed in the receiving space; A second test bushing disposed in the receiving space to be spaced apart from the first test bushing by a predetermined distance and including a second conductor disposed in the receiving space; The accommodation space between the first test bushing and the second test bushing so as not to be disposed on a virtual line or surface formed by the first test bushing and the second test bushing including a third conductor disposed in the accommodation space A third test bushing disposed on the; A door disposed on the body to open and close the accommodation space; And a grounding portion disposed on an inner surface of the door and electrically coupled to the first conductor, the second conductor, and the third conductor when the door is closed, wherein the grounding portion is disposed on the inner side of the door. A fixed bracket; At least one supporter fixed to the bracket so as to be disposed in the space between the first conductor to the third conductor when the door is closed; A pair of V-shaped blades fastened to face each other to the supporter and electrically connected to the first to third conductors when the door is closed; And at least one leaf spring disposed on an outer surface of each of the pair of blades.

The present invention improves the arrangement structure of the test bushing in a triangular shape to reduce the arrangement area in the width or length direction to reduce the size of the ring main unit. The grounding of the test bushing can be excellently achieved.

In addition, according to the present invention, a stable insulation performance test can be achieved by an interlock unit having an improved structure capable of shielding the entry of an operation handle for operating a ground unit according to the above structure.

1 is a perspective view of a ring main unit according to an embodiment of the present invention.
FIG. 2 is a view showing a state of an interlock unit disposed therein before the door is closed in FIG. 1;
3 is a view showing a state of an interlock unit disposed therein when the door is closed in FIG. 1;

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

Unless otherwise defined, all terms in the present specification are the same as the general meanings of terms understood by those skilled in the art, and if terms used in the present specification conflict with the general meanings of the terms, the definitions used in the present specification are applied.

However, the invention to be described below is only for describing an embodiment of the present invention and not for limiting the scope of the present invention, and reference numerals used identically throughout the specification represent the same elements.

1 is a perspective view of a ring main unit according to an embodiment of the present invention, FIG. 2 is a view showing a state of an interlock unit disposed inside before the door is closed in FIG. 1, and FIG. 3 is a view when the door is closed in FIG. It is a diagram showing the state of the interlock unit disposed inside.

Referring to FIG. 1, the ring main unit according to an embodiment of the present invention is largely a main body 100, a test bushing part 200, a door 300, a ground part 400, and a grounding device 500. ) And an interlock unit 600.

The main body 100 forms the appearance of the ring main unit according to an embodiment of the present invention, and may further include a load break switch, a circuit breaker, etc. in addition to components to be described later.

In addition, the main body 100 may be provided with a receiving space 110 in which one side is opened for receiving a test bushing 200 to be described later.

In addition, an operation hole (not shown) may be further formed in the main body 100 at a portion spaced apart from the accommodation space 110, and such an operation hole is an interlock to be described later as a hole through which a separate operation handle can be inserted. It may be selectively opened and closed by the shielding end 623 of the unit 600.

The manipulation hole may be exposed by opening and closing the auxiliary door 120 fastened to the main body 100 again.

In addition, a ground terminal 130 for grounding the test bushing 200 to be described later may be disposed in the receiving space 110 on the main body 100.

The test bushing part 200 is a part for testing the insulation performance of the ring main unit according to an embodiment of the present invention, and a third commercially available first test bushing 210 for testing the insulation performance of the load switch (not shown) , The second test bushing 220 and the third test bushing 230 may be included, and a bus bar 240 or a fourth conductor 250 may be further included.

The first test bushing 210 includes a first conductor 211 disposed in the receiving space 110 and may be disposed in the receiving space 110.

Here, the first conductor 211 is electrically connected to an external terminal for an insulation performance test, and may be disposed on the first test bushing 210 in an integral or fastening type with the first test bushing 210. have.

The second test bushing 220 includes a second conductor 221 disposed in the accommodation space 110 and may be disposed in the accommodation space 110 to be spaced apart from the first test bushing 210 by a predetermined distance. have.

Here, the second conductor 221 is electrically connected to an external terminal for an insulation performance test, and may be disposed on the second test bushing 220 in an integral or fastening type with the second test bushing 220. have.

Here, since the first test bushing 210 and the second test bushing 220 are disposed to be spaced apart from each other by a predetermined distance, a virtual line connecting them may be formed, and a third test bushing according to an embodiment of the present invention to be described later. The test bushing 230 is disposed so as not to be disposed on the virtual line, so that the total length or width of the test bushing 200 can be effectively reduced.

Specifically, the third test bushing 230 includes a third conductor 231 disposed in the accommodation space 110 and is formed by the first test bushing 210 and the second test bushing 220. It may be disposed in the accommodation space 110 between the first test bushing 210 and the second test bushing 220 so as not to be disposed on the line or surface of the. That is, the first to third test bushings 210 to 230 may be roughly disposed in a triangular shape.

Here, the third conductor 231 is electrically connected to an external terminal for an insulation performance test, and may be disposed on the third test bushing 230 in an integral or fastening type with the third test bushing 230. have.

The fourth conductor 250 may be electrically connected to the third conductor 231 and disposed on an imaginary line or surface formed by the first conductor 211 and the second conductor 221, and thus Accordingly, by arranging the ground portion 400 to be described later as a single ground portion 400 on the door 300 to be described later, manufacturing cost, time, and all costs associated with maintenance and repair may be reduced.

Here, the fourth conductor 250 may be electrically connected to the third test bushing 230 in an integral or fastened form with the third conductor 231.

Although not shown, when the third conductor 231 and the fourth conductor 250 are integrally formed with the third test bushing 230, the third conductor 231 is bent at least once and It may be disposed on the virtual line formed by the first conductor 211 and the second conductor 221.

As shown, when the fourth conductor 250 is disposed in a fastening type with the third test bushing 230, the ring main unit according to the embodiment of the present invention comprises the third conductor 231 and the fourth A bus bar 240 electrically connecting the conductor 250 may be further included.

Such a bus bar 240 may be electrically fastened at one end by a method such as bolting, welding, etc. with the third conductor 231, and the other end is bolted to the fourth conductor 250, welding, etc. It can be electrically fastened in a known manner.

The door 300 may be disposed on the main body 100 to open and close the receiving space 110, and may selectively open and close the receiving space 110 by a sliding method or a hinge rotation method.

For example, the door 300 has a hinge hole formed, and a shaft inserted into the hinge hole is disposed in the main body 100 so that the door 300 may be fastened to the main body 100 so that the door 300 can be detachably attached. have.

In this case, since the ground part 400, which will be described later, is connected to the door 300, and the ground part 400 is connected to the ground terminal 130 of the main body 100 by a ground wire 410, the door ( Even if 300) is detached, it can have the advantage that there is no fear of loss or damage.

The grounding part 400 is separate from the grounding device 500 to be described later, and is a component for grounding the first to third test bushings 210 to 230 of the test bushing part 200.

That is, the ground part 400 is disposed on the inner side of the door 300 so that when the door 300 is closed, the first conductor 211, the second conductor 221, and the fourth conductor 250 And can be electrically fastened.

Specifically, the ground part 400 may include a ground line 410, a bracket 420, a supporter 430, a pair of blades 440, and a leaf spring 450.

The ground line 410 may have one end electrically connected to the ground part 400 and the other end electrically connected to the ground terminal 130 of the main body 100 disposed in the receiving space 110. For effective grounding of the ground line 410, the ground line 410 may be electrically coupled to a pair of blades 440 to be described later.

The bracket 420 may be fixed to the inner surface of the door 300, and may not be electrically connected to a pair of blades 440 to be described later in consideration of stability in relation to the door 300.

At least one of the supporters 430 is disposed in the space between the first conductor 211, the second conductor 221, and the fourth conductor 250 when the door 300 is closed. It may be fixed to 420 and may not be electrically connected to a pair of blades 440 to be described later in consideration of stability in relation to the door 300.

The pair of blades 440 are fastened to face each other to the supporter 430 so that when the door 300 is closed, the first conductor 211, the second conductor 221 and the fourth conductor 250 And can be electrically connected.

That is, the spacing between the pair of blades 440 may be disposed to be equal to or smaller than the diameters of the first conductor 211, the second conductor 221, and the fourth conductor 250, which is the supporter ( It may be considered by the width (diameter) of 430 and/or the leaf spring 450 to be described later.

At least one leaf spring 450 is disposed on the outer surface of each of the pair of blades 440 to press the outer surface of the pair of blades 440, thereby the first conductor 211 , Even if the second conductor 221 and the fourth conductor 250 are inserted between the pair of blades 440, the gap may be maintained to achieve stable current.

The grounding device 500 is a device separate from the grounding part 400 described above, and for grounding of the load switch or circuit breaker accommodated in the main body 100, the main grounding device is operated at a position corresponding to the operation hole. A handle insertion hole 510 to which a possible manipulation handle can be fastened is formed and may be disposed inside the main body 100.

In order to test the insulation performance of the test bushing part 200 by opening the door 300, the grounding of the main components must be preceded by the operation of the grounding device 500, and then the door 300 is opened. In this case, since the grounding of the grounding device 500 must be maintained, the manipulation handle should not be inserted into the handle insertion port 510.

Accordingly, the present invention may include an interlock unit 600 that closes the operation hole when the door 300 is opened and opens the operation hole when the door 300 is closed.

The interlock unit 600 may include a pressing protrusion 610, an interlock bar 620, a spring 630 and/or a guide bolt 640.

The pressing protrusion 610 may be formed on one side of the door 300, wherein the protruding direction of the pressing protrusion 610 is a protruding direction of the first conductor 211 to the fourth conductor 250 And can be a horizontal direction.

In addition, the pressing protrusion 610 may have an inclined portion 611 formed on one side of the pressing protrusion 610 to easily press the contact end 622 to be described later.

The interlock bar 620 includes a body 621 disposed to enable translation on the grounding device 500, and a contact end extending from one end of the body 621 to contact the pressing protrusion 610 ( 622 and a shielding end 623 for selectively opening and closing the operation hole at the other end of the body 621.

In addition, the body 621, the contact end 622 and/or the shielding end 623 may be coupled to each other as separate plates.

The spring 630 has one end connected to the interlock bar 620 and the other end connected to the grounding device 500 to provide a driving force for the translational movement of the interlock bar 620, and at least one Can be placed.

In addition, the spring 630 may be implemented as a coil spring.

For the translational movement of the interlock bar 620, the body 621 has at least one long hole 621a horizontal to the translation direction, and the interlock unit 600 penetrates the long hole 621a. Thus, a guide bolt 640 fastened to the grounding device 500 may be further included.

That is, when the door 300 starts to close, the pressing protrusion 610 comes into contact with the contact end 622 and gradually presses the contact end 622.

The body 621 integrally formed with the contact end 622 by the pressing of the contact end 622 moves to one side (the lower side in the drawing) despite the elastic force of the spring 630, and thus the The shielding end 623 is also moved to open the manipulation hole.

Conversely, when the door 300 is opened, the external force of the pressing protrusion 610 that presses the contact end 622 is released, and accordingly, the return force of the spring 630 acts to the interlock bar 620 Is moved to the other side (upper side) so that the shielding end 623 closes the manipulation hole to block the insertion of the manipulation handle.

In short, the present invention improves the arrangement structure of the test bushing into a triangular shape to reduce the arrangement area in the width or length direction to reduce the size of the ring main unit, and despite such a test bushing arrangement structure, a single grounding part As a result, it is possible to achieve excellent grounding of the test bushing.

Therefore, unlike the above-described embodiment, even if the fourth conductor 250 is not included, when the door 300 is closed, the first conductor 211 to the third conductor 231 are electrically connected. The pair of blades 440 may be formed in a V-shape to correspond to the arrangement shape of the first to third conductors 211 to 231.

In addition, according to the present invention, a stable insulation performance test can be achieved by an interlock unit having an improved structure capable of shielding the entry of an operation handle for operating a ground unit according to the above structure.

From the above description, those skilled in the art will recognize that various changes and modifications can be made without departing from the technical spirit of the present invention, and the technical scope of the present invention is not limited to the contents described in the embodiments, but claims It should be determined according to the scope and the scope equivalent thereto.

100: main body 110: accommodation space
120: auxiliary door 130: ground terminal
200: test bushing unit 210: first test bushing
211: first conductor 220: second test bushing
221: second conductor 230: third test bushing
231: third conductor 240: busbar
250: fourth conductor 300: door
400: ground part 410: ground wire
420: bracket 430: supporter
440: a pair of blades 450: leaf spring
500: grounding device 510: handle insertion port
600: interlock unit 610: pressure protrusion
611: slope 620: interlock bar
621: body 621a: long hole
622: contact end 623: shield end
630: spring 640: guide bolt

Claims (9)

A main body having an open receiving space on one side thereof;
A first test bushing disposed in the receiving space and including a first conductor disposed in the receiving space;
A second test bushing disposed in the receiving space to be spaced apart from the first test bushing by a predetermined distance and including a second conductor disposed in the receiving space;
The accommodation space between the first test bushing and the second test bushing so as not to be disposed on a virtual line or surface formed by the first test bushing and the second test bushing including a third conductor disposed in the accommodation space A third test bushing disposed on the;
A fourth conductor electrically connected to the third conductor and disposed on an imaginary line or surface formed by the first conductor and the second conductor;
A bus bar electrically connecting the third conductor and the fourth conductor;
A door disposed in the main body to open and close the accommodation space; And
A grounding portion disposed on the inner side of the door and electrically coupled to the first conductor, the second conductor, and the fourth conductor when the door is closed,
The ground part,
It is formed parallel to a virtual line or surface formed by the first test bushing, the fourth conductor and the second test bushing, and is electrically connected to the first conductor, the second conductor, and the fourth conductor when the door is closed. Ring main unit comprising a pair of blades.
delete delete The method of claim 1,
The ring main unit further comprises a ground wire having one end electrically connected to the ground part and the other end electrically connected to a ground end of the main body disposed in the accommodation space.
The method of claim 1,
The ground part,
A bracket fixed to the inner side of the door;
At least one supporter fixed to the bracket so as to be disposed in a space between the first conductor, the second conductor and the fourth conductor when the door is closed, and
Ring main unit comprising; at least one leaf spring disposed on an outer surface of each of the pair of blades.
The method of claim 1,
The ring main unit,
An operation hole formed in the main body;
A grounding device disposed inside the main body and having a handle insertion hole through which an operation handle capable of operating whether or not the main ground can be fastened at a position corresponding to the operation hole; And
And an interlock unit that closes the operation hole when the door is opened and opens the operation hole when the door is closed.
The method of claim 6,
The interlock unit,
A pressing protrusion formed on one side of the door;
An interlock bar comprising a body arranged to be translatable on the grounding device, a contact end extending from one end of the body to contact the pressing protrusion, and a shield end selectively opening and closing the operation hole at the other end of the body ; And
Ring main unit comprising; at least one or more springs having one end connected to the interlock bar and the other end connected to the grounding device.
The method of claim 7,
The body has at least one long hole horizontal to the direction of translational movement,
The interlock unit further comprises a guide bolt through the long hole and fastened to the grounding device.
delete

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