KR101642765B1 - A pole transformer has inserted lead wire type high voltage complex bushing - Google Patents

Abstract

The present invention relates a pole transformer equipped with a high voltage bushing integrated with a lead wire. According to the present invention, the pole transformer (10) comprises: an outer box (11); a cover (12) to seal the outer box (11); a housing part (1a) having a plurality of hat shapes and installed on the cover (12) to transfer power of a high voltage to a coil winding part (14) in the pole transformer (10); a skirt part (1b) extending from the housing part (1a) and having a skirt shape; a high voltage complex bushing (1) composed of a penetration insertion portion (1c) extending from the skirt part (1b); and a low voltage bushing (13) installed on the outer wall surface of the outer box (11) to transfer the transformed power of a low voltage to the outside again. The high voltage complex bushing (1) includes a bushing core (2) made of an insulating material. A lead wire (3) to be connected to a cut-out switch during a manufacturing process, and an end of a core conductor connected to the coil winding part (14) are directly connected via a contact (2a), and the lead wire (3) and the core conductor (4) are insert-molded to be disposed in the bushing core (2). Therefore, the lead wire (3) and the core conductor (4) are fixed in a state of being directly connected electrically. The penetrating insertion portion (1c) of the high voltage complex bushing (1) to be inserted through the cover (12) is provided with a connecting part (1d), and a nut-shaped connecting part (6) is put on the connecting part (1d). In this way, the connecting part (1d) of the high voltage complex bushing (1) is tightly combined with the bottom surface of the cover (12). Since the high voltage complex bushing is integrated with the lead wire to be connected to the cut-out switch (COT) through a molding process, it is possible to dramatically shorten a working process when installing the pole transformer on an electric pole and to prevent an imperfect electrical connection between the lead wire and the COT due to the non-uniformity of a fastening method of each worker.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pole transformer having a lead wire integrated high-voltage composite bushing,

The present invention relates to a pneumatic transformer provided with a lead-wire integrated high-pressure compound bushing, and more particularly, to a pneumatic transformer in which a lead-wire for connecting a cut-out switch (COS) is integrally formed in a high-voltage composite bushing of a pneumatic transformer, It is possible to greatly reduce the connection work process with the rear cut-out switch, and it is possible to greatly reduce the work inconvenience of connecting the high-pressure bushing and the cut-out switch of the conventional pneumatic transformer, And a lead-wire-integrated high-pressure compound bushing which is improved so as to be very easily and firmly installed in the lid portion of the pillar transformer.

Generally, power supplied from a substation to a high voltage (22,900 V) is converted and supplied to a low voltage that can be used in a home or industrial field through a transformer.

In this case, a transformer is a generic term for a device for changing an alternating voltage and a current value by an electromagnetic induction action. In particular, as described above, a pneumatic transformer converts a high- This is usually fixedly installed on a pole or the like.

Although the structure of such a pillar transformer may exhibit a difference depending on the capacity and the voltage, it generally includes a winding wire and an iron core for performing the function of a transformer, and these windings and the iron core are embedded in a tank filled with insulating oil This insulating oil prevents the moisture and dust from penetrating into the insulation of the winding, thereby lowering the dielectric strength, and at the same time, dissipates the heat generated by the iron core or the coil by convection and radiation of the oil.

The construction of such a typical pillar transformer is shown in Fig.

As shown in FIG. 1, the punch transformer 100 includes a box-shaped enclosure 110, a lid 120 for enclosing the box-shaped enclosure 110, and a connecting member 130 for applying a high- Pressure bushing 130 (or "primary bushing") installed through the lid 120 and a low-pressure bushing 130 installed on the outer wall of the enclosure 110 to draw out the transformed low- (140, or "secondary bushing").

At this time, the inside of the enclosure 110 of the pillar transformer 100 is filled with insulating oil so as to cool the heat generated at the time of transforming.

In addition, the high-voltage bushing 130 can insulate a high voltage of a bare wire part with a sufficient supporting force to support the electric wire as well as having sufficient electrical insulation strength, (Insulators) having excellent heat resistance and corrosion resistance are mainly used in order to prevent the dielectric strength from deteriorating when the dust or the like is adhered. Recently, as the polymer synthesis technology has been developed, the high pressure bushing 130 Polymer rubber or polymer materials such as EPDM (ethylene propylene rubber), XLPE, epoxy and silicone rubber are used as materials.

Here, the high-voltage bushing 130 coupled to the pneumatic transformer 100 has already been widely used.

For example, in the Korean Registered Utility Model No. 0282453 (published on July 19, 2002), Registered Patent Publication No. 0951473 (Apr. 7, 2010), Registered Utility Model No. 0462698 (issued on September 24, 2012) A technique related to a bushing for a transformer is disclosed.

2 shows an embodiment of a conventional high-pressure bushing for a pillar transformer.

As shown in FIG. 2, the high-voltage bushing 130 connects the cable 170 (see FIG. 3) to apply a high-voltage power supplied from the outside in the punching transformer 100 to the coil inside the punching transformer 100 .

The high pressure bushing 130 is installed in the transformer and has a hollow portion 132 formed therein. The high pressure bushing 130 is fixed to the inside of the insulator 131 while being electrically connected to the transformer, A connector 133 extending to the upper portion of the insulator 131 and a screw terminal 134 connected to the screw shaft 134 of the connector 133 and having a connection terminal 136 on the upper surface thereof, And a terminal clamp 135 in the form of a cap.

At this time, the connector 133 electrically connects the enclosure 137 inside the transformer and the connection terminal 136.

The connector 133 is a rod-like conductor having a flange portion at a central portion thereof. The upper side of the connector 133 is connected to the connection terminal 136 of the terminal clamp 135 with respect to the flange of the connector 133, And the lower side is the case where the enclosing member 137 is coupled by soldering or welding.

The connection terminal 136 is integrally formed with a cap-shaped terminal clamp 135 that is screwed to the screw shaft 134 and covers the upper end of the insulator 131.

When the high-pressure bushing 130 having such a configuration is coupled to the punching transformer 100 (see FIG. 1), the insulating oil filled in the punching transformer 100 flows into the hollow portion 132 of the insulator 131 The connector 133 is hermetically sealed between the terminal clamp 135 and the upper end surface of the insulator 131 and the upper surface of the flange portion of the connector 133. At this time, Shaped packings 138 and 139 for holding and engaging, respectively.

The packing 138 prevents the insulating oil introduced into the insulator 131 from leaking to the through hole of the insulator 131 together with the terminal clamp 135 and prevents damage to the insulator 131 .

In order to assemble the conventional high-voltage bushing 130 with the pneumatic transformer 100, the high-voltage bushing 130 having the above-described structure must be connected to the punching transformer 100, The connector 133 and the terminal clamp 135 of the high-pressure bushing 130 are separately assembled and assembled in the process of assembling and installing the high-voltage bushing 130. Thus, unnecessary work flow occurs, There is a disadvantage that the packing 138 needs to be performed between the clamps 135 in order to maintain airtightness.

Particularly, when assembling the terminal clamp 135, there is a possibility that leakage occurs when the assembling method is uneven and the airtightness is deteriorated according to each worker. When the defects arise due to the assembly failure, the pole transformer needs to be replaced Therefore, there is a disadvantage that the exchange cost is incurred thereby leading to economic loss.

The pneumatic transformer 100 provided with the high-pressure bushing 130 as described above is installed in a pole 150 installed at a position separated from a building such as a residential building as shown in FIG.

3, the pillar transformer 100 is installed at a predetermined position of the electric pole 150, the cut-out switch 160 is installed above the pillar transformer 100, The cutout switch 160 is connected to the primary side high-voltage bushing 130 of the transformer 100 through a cable 170 so that the transformer 100 can be protected from overvoltage and overcurrent, and can be opened and closed during maintenance and repair.

The cut-out switch 160 is connected to the primary side high-voltage bushing 130 of the pillar-type transformer 100 so that when an overload or an overcurrent is applied, To protect the transformer from accidents such as

As described above, the cut-out switch (COS) 160 is attached to the primary side of the pneumatic transformer and the high-voltage accountable point of the distribution line to prevent breakage or breakage of the transformer due to surge voltage or over- Which protects the transformer and is used for opening and closing the line of the transformer.

At this time, professional installation work is required to install the pillar transformer 100 in the electric pole 150 and to connect it to the cut-out switch 160.

That is, the connection and disconnection process of the conventional pole-to-pole transformer and the cut-out switch will be briefly described below.

 When the pneumatic transformer 100 is installed in the electric pole 150, the cable 170 connected to the cut-out switch 160 (COS), which is a safety device, is cut from the pneumatic transformer 100 do.

The cable 170 is peeled off the cable 170 so that it can be easily connected to the connection terminal 136 of the pole clamp 135 of the pillar transformer 100 and the clamp of the cut-out switch 160, COS.

Then, the connection terminal 136 of the terminal clamp 135 of the high-voltage bushing 130, which is the primary side of the pneumatic transformer 100, is loosened using a tool so that the cable 170 can be connected.

Then, an insulation cover (not shown) for the transformer bushing according to the standard is inserted into the high-voltage bushing 130 on the primary side of the pillar transformer in order to prevent foreign matter and moisture infiltration.

In this state, the cable 170 for connection of the cut-out switch is connected to the connection terminal 136 of the terminal clamp 135 by using a tool to the pneumatic transformer-side high-voltage bushing 130.

When the cable 170 is connected, the insulating cover for the bushing prepared in the high-voltage bushing 130 on the primary side of the pillar transformer 100 is tightly taped using insulating tape so that rainwater does not enter the insulating cover.

Then, the cable 170 connected to the pneumatic transformer 100 is connected to the cut-out switch 160 (COS) using a tool.

However, the problem in the step of installing the pneumatic transformer has a problem that it may cause a disconnection accident due to the electrical incomplete connection of the connection part due to the unevenness of the clamp tightening torque due to the difference in work method for each field worker.

 Since there is a difference in the method of assembling the insulation cover for bushing to the pillar transformer for each field worker, there is a fear that oxidation of the live part due to foreign matter penetration and moisture penetration may occur due to exposure of the live part.

Especially, in case of working in the field, use the dedicated work vehicle to prepare and cover the cable in the air, clamp work 2 times (pillar transformer side, cutout switch side), insulation cover work for bushing, insulating cover taping work, There is a disadvantage that the labor is greatly increased.

In order to solve the above problems, Korean Patent Registration No. 1548357 (published on Aug. 28, 2015), which is a patent application filed by the present applicant, discloses a pneumatic transformer having a cable-integrated high-pressure bushing.

As shown in FIG. 4, the pillar transformer 100 having the cable-integrated high-pressure bushing disclosed in the above-mentioned Japanese Patent No. 1548357 includes an enclosure 110, a lid 120 for sealing the enclosure 110, The high-voltage bushing 20 is a connecting member that is provided on the power supply side and applies a high-voltage power supplied from the outside through a winding. The connecting member includes a high-voltage bushing 20 to which a cable 27 can be connected, Pressure bushing 130 installed on the outer wall of the housing 110.

5, the high-voltage bushing 20 applied to the punch transformer 100 has a hollow portion 21a formed therein and an outer circumferential surface thereof is surrounded by an insulating housing 22 made of a polymer material A connector 23 which is fixed inside the hollow portion 21a of the auxiliary pipe 21 to be electrically connected to the inside of the pillar transformer 1 and is connected to the enclosure 26, A clamp 24 attached and fixed to the upper surface of the cap 21 so as to be able to connect the cable 27 in a state of being coupled to the cap 21 and a clamp 24 interposed between the upper surface of the cap 21 and the clamp 24, And one end of the cable 27 is assembled and fixed to the clamp 24 in the process of manufacturing the clamp of the high pressure bushing and the outer circumferential surface of the clamp 24 is connected to the cable 27, The bonding portion is wrapped by an insulation housing 29 made of a polymer material through injection molding, and a cable The clamp 24 formed integrally with the connector 23 is screwed to the screw shaft 23c of the connector 23 at the upper end face of the aerator 21 to complete the polymer type high pressure bushing 20.

At this time, the clamp 24 has a clamp body portion having a screw hole formed in a downward direction, and a cable connection portion protruding upward from the clamp body portion to connect the cable 27, A cable receiving groove capable of receiving a covering member of the cable 27 and a conductor portion having a relatively narrow diameter as compared with the cable receiving groove and extending inward to cover the cable 27, Which has a conductor coupling groove formed therein.

However, the high-pressure bushing 20 for a pneumatic transformer in which the above-described cable-integrated clamp is assembled is formed by integrally connecting the clamp 24 and the cable 27 in a clamp manufacturing process applied to the high-pressure bushing 20, Since the connector 23 and the clamp 24 are assembled in a state in which the cable 27 and the clamp 24 are integrated with each other, in the process of manufacturing the high-pressure bushing 20, 24 and a connector 23 are required.

Since the inner pipe 21 of the high-pressure bushing 20 is inserted into the hollow portion 21a and the inner pipe 26 is inserted into the hollow pipe 21a, the insulating oil filled in the pillar- A separate packing 22 is provided between the clamp 24 and the upper surface of the cap 21 which is the connection portion between the clamp 24 and the connector 23 to prevent leakage and to maintain the airtightness. The member 25 is required.

In particular, as shown in FIGS. 5 and 6, when the high-pressure bushing 20 is installed in the punching transformer 100, it passes through the lid 120 of the punching transformer 100 and flows into the inside of the enclosure 110 The spring ring 30 is tightly fitted into the annular groove to form a protruding end. The spring ring 30 and the lid 30 are integrally formed with each other, And a stationary ring 32 is interposed between the bottom surface of the base plate 120 and the base plate.

The stationary ring 32 is interposed between the bottom surface of the lid 120 and the spring ring 30 so as to surround the other end of the high pressure bushing 20. The stationary ring 32 is inserted through the lower end of the stationary ring 32, The high pressure bushing 20 is fixed by pushing the fixed ring 32 to the bottom of the spring ring 30 through the plurality of bolts 35 contacting the bottom surface of the spring ring 30 as much as possible.

Therefore, in order to fix the high-pressure bushing 20 to the pillar transformer cover 120, the first operator inserts the other end of the high-pressure bushing 20 into the through hole of the lid 120, And the other end fixed ring 32 of the high-pressure bushing 20 and the spring ring 30 are inserted in turn.

The spring ring 30 is fixed to an annular groove formed at the other end of the high pressure bushing 20 and then fixed to the bottom surface of the fixed ring 32 through a plurality of bolts 35 inserted through the lower end of the fixed ring 32. [ And is fixed as far as possible from the lid 120 while being caught by the spring ring 30.

However, the above-mentioned general high-pressure bushing 20 has some problems in use. The biggest problem is that the high pressure bushing 20, which is generated when a large number of bolts 35 inserted through the lower end of the fixed ring 32 are not uniformly tightened, This is a breakage phenomenon of the bushing 20.

That is, the high-pressure bushing 20 made of a polymer material having a low abrasion resistance can be easily broken when the tightening pressure of the bolts 35 is not uniform, .

In particular, if there is some crack in the manufacturing and transporting process of the high-pressure bushing 20, the breakage phenomenon thereof is more frequently observed. As a result of the fastening operation of the high-pressure bushing 20 to the punching transformer lid 120 Is being carefully carried out by skilled workers.

In addition, since a large number of bolts 35 are required to be tightened several times even when skilled workers are employed, the operation time is long, and the high-pressure bushing 20 is damaged due to impact applied during the tightening process. The high pressure bushing 20 may be separated during the operation of the transformer.

Korea Registered Utility Model No.0282453 (High voltage bushing fixing device of pillar transformer) Korean Registered Patent Publication No. 0951473 (April 7, 2010, name: bushing for transformer) Registered Utility Model No.0462698 of Korea Register (September 24, 2012, name: bushing for pole transformer) Korean Registered Patent No. 1548357 (published on Aug. 28, 201, entitled: Pole-shaped transformer having a cable-integrated high-pressure bushing)

Accordingly, it is an object of the present invention to solve the various problems caused by assembling the cable between the high-voltage bushing and the cut-out switch in the process of installing the conventional pillar-form transformer on the pole, It has been researched and developed to improve and complement the problem.

That is, an object of the present invention is to provide a pneumatic transformer in which a lead-in wire for connecting a cut-out switch (COS) is integrally formed in a high-voltage bushing of a punching transformer so that a connecting operation can be performed without using an insulating cover for bushing, It is possible to greatly reduce the workload and to reduce the workload and to maintain the airtightness between the cutout switch and the pneumatic transformer. When connecting the lead wire between the cutout switch and the high-voltage bushing, an electrical imperfect connection accident The present invention is to provide a pole-type transformer having a lead-wire-integrated high-pressure compound bushing which can prevent an unintentional over-

In addition, when a high-pressure composite bushing is installed on the lid of the punching transformer, the present invention improves the method of fastening with a large number of bolts and firmly adheres to the high-pressure composite bushing by a nut method. Can be firmly fixed to the bottom of the lid of the pneumatic transformer, so that not only the workability is excellent but also the tightening force is applied uniformly to the fastening portion by the nut, thereby preventing the breakage of the high- Another object of the present invention is to provide a pillar-type transformer having a lead-wire-integrated high-pressure compound bushing.

According to an aspect of the present invention, there is provided a power transformer comprising: an enclosure; a lid for enclosing the enclosure; and a plurality of external appearance shapes for applying high-voltage power supplied from the outside to the inside of the pillar transformer. A high pressure composite bushing comprising a housing portion having a plurality of projections, a skirt portion having a skirt shape extending from the housing portion, and a penetration insertion portion extending from the skirt portion; The bushing core includes a bushing core formed by molding a high-pressure composite bushing with an insulating material. The bushing core includes a lead wire connected to the cut-out switch and a pillar- One end of the center conductor connected to the inner winding portion is inserted and formed in a state of being directly connected through the connection portion The fastening part is formed on the through-hole of the high-pressure composite bushing, which is inserted through the lid. The nut-type fastening part is inserted into the fastening part And a lead-wire-integrated high-pressure compound bushing in which the fastening portion of the high-pressure composite bushing is assembled and fixed in tight contact with the bottom surface of the lid.

According to an embodiment of the present invention, the bushing core is formed of a BMC material, and the outer circumferential surface of the bushing core is formed as an outer surface of the high-pressure composite bushing.

According to another embodiment of the present invention, the bushing core is formed of a BMC material, and the outer peripheral surface of the bushing core corresponding to the housing portion and the skirt portion of the high- The housing is integrally enclosed through the molding, and the penetration insertion portion of the high-pressure composite bushing is formed by the outer peripheral surface of the bushing core.

At this time, it is preferable that the center conductor portion located inside the bushing core is inserted in a state where the heat-resistant tubing is wrapped.

And, according to the present invention, the fastening portion can be made of a reinforcing material fastening member having a threaded portion inserted in the bushing core, and the fastening portion can be formed directly in the form of a thread on the bushing core.

According to the present invention, a lead wire integrated type high-pressure composite bushing is installed in a pneumatic transformer by integrally forming a lead wire for connecting a cut-out switch (COS) to a high-pressure bushing for a pneumatic transformer, and this pneumatic transformer is connected to a cut- It is unnecessary to assemble the lead wire to the high-pressure composite bushing, so that the construction work itself is easy and a separate tightening work by the worker is not necessary, It is possible to prevent incomplete electrical connection accidents that may occur due to nonuniform tightening work.

In addition, according to the present invention, it is possible to secure safety in the operation of the transformer and the distribution facility by maximizing the leakage distance of the ground through the prevention of the original exposure of the high-voltage composite bushing charging unit that applies the power supplied from the outside by the pneumatic transformer .

Further, according to the present invention, in the process of connecting the punching transformer with the cutout switch of the electric pole, the connection work can be performed without using the insulation cover for bushing as in the prior art, As a matter of course, the airtightness between the cutout switch and the pillar transformer can be maintained.

Particularly, according to the present invention, when the high-pressure composite bushing is formed in the high-pressure composite bushing, the inside of the high-pressure composite bushing is not through-formed There is an advantage that the insulating oil can be originally blocked from being introduced into the high-pressure composite bushing.

In addition, according to the present invention, when a lead-wire integrated high-pressure composite bushing is installed on a lid of a pneumatic transformer, it can be tightly adhered by a nut type so that even if the operator is not an expert, the nut is tightened so that a high- It is possible to prevent the breakage of the high-pressure composite bushing caused in the tightening process due to the uniform tightening force applied to the fastening site by the nut, The present invention has the advantage of effectively solving the problem of the fastening method.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a conventional configuration of a pillar transformer according to the prior art; Fig.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pneumatic transformer, and more particularly,
FIG. 3 is an exemplary view showing a state in which a pillar-type transformer installed in a pole and a cut-out switch are connected by a cable according to the related art.
Fig. 4 is a schematic view showing the configuration of a pillar-type transformer having a cable-integrated high-pressure bushing disclosed in the prior art publication No. 1548357. Fig.
Fig. 5 is a schematic cross-sectional view showing the construction of a cable-integrated high-pressure bushing disclosed in the prior art publication No. 1548358. Fig.
6 is a schematic cross-sectional view illustrating an example of a fastening state of a high-pressure bushing installed in a pillar transformer according to the related art.
FIG. 7 is a schematic cross-sectional view showing the configuration of a pillar transformer provided with a cable-integrated high-pressure bushing according to the present invention; FIG.
8 is a schematic view showing an embodiment of a lead wire integrated type high-pressure compound bushing installed in a pillar transformer according to the present invention.
9 is a schematic view showing another embodiment of a lead-wire integrated type high-pressure compound bushing installed in a pillar transformer according to the present invention.
10 is a schematic view showing a modified embodiment of a fastening part in a lead-wire integrated type high-pressure compound bushing installed in a pneumatic transformer according to the present invention.

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

In order to explain the preferred embodiments of the present invention, the thicknesses of the lines and the sizes of the components shown in the accompanying drawings may be exaggerated or omitted for clarity and convenience of description, Terms to be given are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator.

As shown in Fig. 7, the punching transformer 10 according to the present invention includes a box-shaped enclosure 11, a lid 12 for sealing the box-like enclosure 11, A high-pressure compound bushing 1 installed through the lid 12 as a connecting member for applying a high-voltage power to be supplied by a winding, and a high-pressure multifunction bushing 1 installed on the outer wall of the enclosure 11 to draw out the transformed low- Pressure bushing 13. The inside of the enclosure 11 is filled with insulating oil so as to cool the heat generated at the time of transforming.

As described above, the punching transformer 10 according to the present invention is a device for transforming a high-voltage alternating-current power input from a power system and supplying transformed alternating-current power to the load, like the ordinary punching transformer. Pressure composite bushing 1, a winding section 14 and a low-pressure bushing 13 connected to a switch (Cut-Out Switch).

At this time, the cut-out switch transmits the high-voltage AC power inputted from the power system to the winding part 14 inside the pillar-type transformer 10 through the high-pressure composite bushing 1, and the cut- And when the current is sensed, separates the pillar transformer 10 from the power system.

The high voltage composite bushing 1 is an input terminal of the winding section 14 and inputs AC power input from the power system to the winding section 14. The winding section 14 is connected to the pillar transformer 10, Pressure composite bushing 1 and supplies the alternating-current power to the load through the low-pressure bushing 13. The low-pressure bushing 13 is connected to the high-pressure composite bushing 1 through the low- That is, the winding section 14 transforms the high-voltage alternating-current power supply to the low-voltage alternating-current power supply, and supplies the transformed alternating-current power supply to the load through the low-pressure bushing 13.

The primary winding 14a is connected to the center conductor 14a and the secondary coil 14b. The primary coil 14a and the secondary coil 14b are connected to each other by a coil 4 to the high-pressure composite bushing 1, and has a predetermined resistance value.

The secondary coil 14b is connected to the low-voltage bushing 13 and has a predetermined resistance value. The low-voltage bushing 13 is an output terminal of the winding unit 14, And the transformed AC power is supplied to the load.

As described above, the high-voltage composite bushing 1 serves as a connecting member for electrically connecting the lead wire 3 connected to the cut-out switch and the center conductor 4 connected to the winding portion 14 of the pillar transformer 10 .

The present invention is characterized in that the lead wire 3 is integrally fixed by molding in a state in which the lead wire 3 is directly connected to the center conductor 4 in the bushing core 2 of the high-pressure composite bushing 1 during the manufacturing process of the high- .

In the process of connecting the cut-out switch, which is a safety device, and the high-voltage composite bushing 1 of the pillar-form transformer 10 by the lead wire 3, when the pillar transformer 1 is installed through the above- And the operation of assembling the cable 170 to the high-pressure bushing 130 as described in the prior art is eliminated.

Hereinafter, the high-pressure composite bushing 1 according to the present invention will be described in more detail.

As shown in FIG. 8, the lead wire integrated high pressure composite bushing 1 according to the present invention includes a high pressure bushing requiring a clamp and a connector for electrically connecting a conventional lead wire (i.e., cable) Otherwise, it has a constitutional feature consisting largely of a bushing core 2, a lead wire 3 and a center conductor 4 only.

The lead wire integrated high pressure composite bushing 1 according to the present invention corresponds to a polymer type high pressure bushing and can be classified into a type in which the bushing core 2 as an insulating material forms an outer appearance of the high pressure composite bushing 1, An insulating housing 7 made of an insulating material may be integrally enclosed by molding on the outer circumferential surface of the bushing core 2 made of an insulating material.

The type in which the bushing core 2 of the insulating material itself forms an outer appearance of the high-pressure composite bushing 1 is characterized in that the lead wire 3 is directly attached to the central conductor 4 during the manufacturing process of the high-pressure bushing, When the bushing core 2 of the high-pressure bushing is injection-molded, the lead wire 3 and the center conductor 4 are directly connected to each other and are inserted into the injection mold so as to be integrally molded in the bushing core 2 .

Here, the lead wire 3 is a cable (i.e., a wire) for applying a high-voltage power supplied from the outside to the winding portion 14 in the pillar transformer 10, and the center conductor 4 is enclosed (Copper wire), and is electrically connected to the lead wire 3 to be electrically connected to the winding portion 14 of the pillar transformer 10 inside the pillar transformer 10 as shown in Fig. 7 .

The lead wire integrated type high pressure composite bushing 1 according to the present invention will be described in more detail as follows.

As shown in Fig. 8, when the lead wire integrated type high-pressure composite bushing 1 according to the present invention is installed in a pillar transformer 10 (see Fig. 7) in the same manner as a normal high- A housing portion 1a having a plurality of tabs located outside the housing portion 11, a skirt portion 1b having a skirt shape continuously connected to the housing portion 1a, And a penetration inserting portion 1c inserted into the inside of the enclosure 11 through the lid 12 of the pillar transformer 10. [

At this time, the housing part 1a has a plurality of external shapes, and the skirt part 1b has a skirt shape having a relatively large diameter as compared with the housing part 1a, and the high-pressure composite bushing 1 The lower surface of the skirt portion 1b and the upper end surface of the lid 12 of the pillar transformer 10 are in close contact with each other when assembled to the pillar transformer 10. [

The penetration inserting portion 1c extends downwardly from the skirt portion 1b in a stepped manner so as to have a relatively narrow diameter as compared with the skirt portion 1b and is inserted into the lid 12 of the pillar- So that it can be firmly and tightly fastened to the bottom surface of the lid 12. [

That is, the penetration inserting portion 1c is formed with a fastening portion 1d for fastening a separate fastener 6 such as a nut.

As described above, the conventional lead-wire integrated type bushing 1 according to the present invention having such a shape feature has a clamp and a connector for electrically connecting the lead wire (i.e., cable) to the center conductor, The lead wire 3 and the central conductor 4 are electrically connected directly inside the bushing core 2 so that the bushing core 2, the lead wire 3, It is possible to constitute the high-pressure compound bushing 1 which is a connecting member made only of the conductor 4.

Since the end of the lead wire 3 and the one end of the center conductor 4 are directly connected to each other at the connection portion 2a inside the bushing core 2 as described above, There is no need to perform the operation of assembling the lead wire 3 and the high-pressure composite bushing 1 together when the high-pressure composite bushing 1 of the bushing 10 is connected to each other, so that the operation is very easy .

The bushing core 2 of the lead-wire integrated type high-pressure bushing 1 according to the present invention, which is applied to the present invention as described above, Is formed into an insulating material through a mold so as to have a single structure formed by the outer surface of the high-pressure composite bushing (1).

8, the outer shape of the molded bushing core 2 is formed in the housing portion 1a, the skirt portion 1b, the through-hole insertion portion 1c ).

The bushing core 2 is preferably formed using a BMC (Bulk molding compound) material having high insulation resistance and high strength.

This is because the bushing core 2 is responsible for the appearance of the high-pressure composite bushing 1, so that the bushing core 2 exposed to the outside needs to have not only insulating properties but also durability against the external environment, Considering these environmental characteristics, BMC (Bulk molding compound) materials are being selected and used.

That is, in the manufacturing process, the BMC material is uniformly mixed with an unsaturated polyester resin, a water-reducing agent, a curing agent, a filler, a release agent and the like using a kneader, ) Is a bulk thermosetting reinforced plastic mechanical molding material impregnated in a short period of time and is processed by compression molding, injection molding and transfer molding methods. The processed products are excellent in dimensional stability, mechanical strength, electrical performance, heat resistance and water resistance Is known to have.

In order to manufacture the lead-wire integrated type high-pressure composite bushing 1 according to the present invention in the process of molding the bushing core 2, first, the lead wire 3 and the center conductor 4 are directly connected The integrated lead-wire type high-pressure composite bushing 1 can be manufactured by preliminarily preparing the lead wire 3 and the center conductor 4 prepared in the connected state and inserting the prepared lead wire 3 and the central conductor 4 into a mold for molding the bushing core 2 .

Since the molding temperature for molding the bushing core 2 is extremely high, in order to prevent a problem that the core conductor 4 inserted in the bushing core 2 is thermally deformed or melted down It is preferable that the portion of the center conductor 4 located inside the bushing core 2 is inserted into the mold in a state of being wrapped with the heat-resistant tubing 4a to carry out a molding operation.

The lead wire 3 and the central conductor 4 are directly connected and the heat resistant tubing 4a is prepared in a state in which the center conductor 4 is wrapped and inserted on the mold for manufacturing the bushing core 2, The lead wires 3 inserted in the bushing core 2 and the center conductor 4 are firmly fixed in the form of being wrapped with an insulating material when the bushing core 2 is manufactured by molding with a BMC material, The inside of the bushing core 2 has a non-penetrating structure (i.e., a structure having no hollow).

Therefore, even when the high-pressure composite bushing 1 according to the present invention is installed in the punching transformer 10 as shown in Fig. 7, the high-pressure composite bushing 1 (That is, a structure in which a hollow portion is not formed) in the inside of the pneumatic transformer 10, the phenomenon that the insulating oil filled in the pneumatic transformer 10 is leaked to the outside through the high-pressure composite bushing 1, And the like.

9 shows another embodiment of a lead-wire integrated type high-pressure compound bushing installed in a pneumatic transformer applied to the present invention.

9 shows a bushing core 2 and a high-pressure composite bushing 1 surrounding a part of the outer circumferential surface of the bushing core 2 with an insulating housing 7, as another embodiment of the high-pressure composite bushing.

The high-pressure composite bushing 1 shown in Fig. 9 according to another embodiment of the present invention is manufactured in the same manner as described in the high-pressure composite bushing 1 shown in Fig. 8, do.

That is, the high-pressure composite bushing 1 according to another embodiment of the present invention is different from the high-pressure composite bushing 1 shown in Fig. 8 in that it insulates the bushing core 2 with the insulating housing 7 And the lead wires 3 are connected to the center conductor 4 and integrally molded in the bushing core 2 are all the same.

Therefore, the detailed construction and manufacturing process of the high-pressure composite bushing 1 according to another embodiment of the present invention can be understood with reference to the description of the embodiment shown in FIG. 8, Will be omitted.

However, since the insulating housing 7 is formed of an outer material such as silicone or EPDM, which surrounds the bushing core 2, the insulating housing 7 is formed to have a fresh shape and a skirt shape in the molding process.

That is, the outer circumferential surface of the bushing core 2 corresponding to the housing portion 1a and the skirt portion 1b of the high-pressure composite bushing 1 has a structure in which the insulating housing 7 is integrally enclosed by molding.

The bushing core 2 to be insulated by the insulation housing 7 may be made of a material such as FRP, EPDM (ethylene propylene rubber), XLPE, epoxy, and polymers, It goes without saying that materials may also be used.

The insulating housing 7 is made of an insulating material such as silicon or EPDM. The insulating housing 7 is manufactured by first molding a bushing core 2 with an insulating material such as a BMC material, (2) by inserting an insulating housing (7) having a fresh shape and a skirt shape so as to enclose a part of the outer circumferential surface with silicone or EPDM, .

9, the outer peripheral surface of the bushing core 2 corresponding to the housing portion 1a and the skirt portion 1b of the high-pressure composite bushing 1 is formed with an insulating material The insulative housing 7 is integrally enclosed by molding and the penetration inserting portion 1c of the high-pressure composite bushing 1 is formed by the outer circumferential surface of the bushing core 2.

The high-pressure composite bushing 1 composed of the bushing core 2, the lead wire 3, the center conductor 4 and the insulating housing 7 is installed in the punching transformer 10 to form a cutout switch and a lead wire 3, the high-voltage composite bushing 1 according to the present invention is installed in the pillar-type transformer 10 so that the high-voltage power can be applied to the winding part 14 of the pillar- Pressure composite bushing 1 in the process of assembling the bushing core 2 so as to be firmly fixed on the bottom of the lid 12 of the bushing core 2 in consideration of easiness of work and robustness, And a fastening portion 1d.

8 and 9, since the fastening portion 1d is a portion for firmly tightly fastening the high-pressure composite bushing 1 to the bottom surface of the lid 12 of the pillar transformer 10, It is preferable that the nut type fastening holes 6 are separately inserted and fastened.

Thus, the fastening portion 1d is designed to have a screw thread so that a nut type fastening hole 6 can be inserted and screwed.

6, the high-pressure bushing 20 is pushed to the bottom of the pillar transformer 100 to the maximum extent so that the fixed ring 32 is caught by the spring ring 30 through the plurality of bolts 35, The composite bushing 1 is firmly attached to the bottom surface of the lid 12 of the pillar transformer 10 so as to firmly adhere to the lid 120 of the pillar transformer 10, It is changed to a nut tightening method so as to be improved.

For this purpose, according to an embodiment of the present invention, by inserting a reinforcing material fastening member 5 having a screw thread into the fastening portion 1d in the process of molding the bushing core 2, So that the nut-shaped fastener 6 can be screwed onto the thread of the screw 5.

10 shows a modification of the fastening part in the lead wire integrated type high-pressure compound bushing for punching transformer according to the present invention.

That is, as shown in FIG. 10, the threaded portion 5a may be formed in the bushing core 2 itself in the case of constructing the fastening portion 1d. This is because the material itself is excellent in strength due to the adoption of the BMC material as a material for manufacturing the bushing core 2 and even if the threaded portion 5a is formed on the outer peripheral surface of the bushing core 2, There is no difficulty in tightening screws.

However, considering the continuous wear resistance and durability of the fastening portion 1d, it is more preferable to insert the fastening member 5 of reinforcing material as described above, rather than forming the thread 5a in the bushing core 2 itself It would be desirable.

8 to 10 is a packing member 9 mounted between the lid 12 of the pneumatic transformer 10 and the high-pressure composite bushing 1 for hermetic sealing.

The packing member 9 is inserted between the lid 12 of the pillar transformer 10 and the high-pressure composite bushing 1 in a disc shape to maintain airtightness for preventing leakage.

The packing member 9 is preferably made of acrylonitrile butadiene rubber (NBR), which is called nitrile rubber, which has oil resistance.

A manufacturing process of the lead wire integrated type high-pressure compound bushing 1 having the above-described structure will be briefly described below.

First, a lead wire 3 capable of connecting between a cut-out switch COS (not shown) and the high-pressure composite bushing 1 is prepared by cutting a predetermined length, and as shown in Fig. 8, The lead wire 3 which is a conductor portion is securely connected and fixed to one end of the center conductor 4 via the connecting portion 2a.

When the lead wires 3 and the central conductor 4 are prepared in a state in which they are directly connected to each other, the lead wire 3 and the center conductor 4, which are mutually connected on the mold for molding the bushing core 2 of the high- 4) is inserted.

In order to prevent the thermal deformation or melting of the center conductor 4 made of copper due to the high molding temperature during the molding process of the bushing core 2, the center conductor 4 located inside the bushing core 2 ) Portion is inserted into the mold while being wrapped with the heat-resistant tubing 4a.

When the preliminary preparation necessary for the molding is completed, a molding operation is performed to fabricate the bushing core 2 made of BMC. Thus, the lead wires 3 and the center conductor 4 are connected to the bushing core 2 ). ≪ / RTI >

When the high-pressure composite bushing 1 is manufactured using only the bushing core 2 as shown in Fig. 8, the housing portion 1a and the skirt portion 1b are formed on the outer circumferential surface of the bushing core 2, And a skirt shape are formed, and at the same time, a mold capable of forming the through-hole insertion portion 1c is prepared.

A mold 5a may be formed on the bushing core 2 itself so that the fastening member 5 may be inserted into the bushing core 2 so that the fastening portion 1d may be formed on the penetration inserting portion 1c. Ready is natural.

9, when manufacturing the high-pressure composite bushing 1 in which the insulating housing 7 is wrapped around the outer circumferential surface of the bushing core 2, the bushing core 2 The bushing core 2 is manufactured by molding in a state in which the lead wire 3 and the center conductor 4 are directly connected to the inner surface of the bushing core 2, So that the insulating housing 7 can be integrated.

When the lead wire integrated type high-pressure composite bushing 1 is completed through such a molding operation, the end portion of the lead wire 3 is sealed and finished.

When the lead-wire integrated type high-pressure composite bushing 1 is completed as described above, the lid 12 of the pillar-type transformer can be firmly and tightly installed on the lid 12 through the fastening portion 1d and the fastening hole 6 of the high- It will be.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various changes, modifications and equivalents. Accordingly, the above description should not be construed as limiting the scope of the present invention defined by the limits of the following claims.

1: High-pressure composite bushing 1a: Housing part
1b: skirt portion 1c: penetration inserting portion
1d: fastening portion 2: bushing core
2a: connection part 3: lead wire
4: center conductor 4a: heat-resistant tubing
5: fastening member 5a: thread
6: fastener 7: insulated housing
9: packing member 10: pillar-shaped transformer
11: Enclosure 12: Lid
13: low pressure bushing 14: winding part

Claims (6)

A lid 12 for closing the lid 12 so that the high voltage power supplied from the outside can be applied to the winding section 14 in the pillar transformer 10; A skirt portion 1b having a skirt shape extending from the housing portion 1a and a penetration inserting portion 1c extending from the skirt portion 1b And a low-pressure bushing (13) installed on the outer wall of the enclosure (11) for drawing back the transformed low-voltage power to the outside,
The bushing core (2) includes a bushing core (2) in which the high - pressure composite bushing (1) is molded from an insulating material. The lead wire (3a) of the cable (3) And one end of the center conductor 4 connected to the winding portion 14 in the pillar transformer 10 is inserted and formed in a state of being directly connected through the connecting portion 2a so that the lead wire 3 and the center conductor 4 are connected, A fastening part 1d is formed on the penetration inserting part 1c of the high pressure composite bushing 1 inserted through the lid 12 and the fastening part 1d is integrally fixed to the fastening part 1d, And the fastening portion 1d of the high-pressure composite bushing 1 is assembled and fixed in tight contact with the bottom surface of the lid 12 as the nut type fastening tool 6 is inserted into the high- A pillar-type transformer installed therein.
The method according to claim 1,
Wherein the bushing core (2) is formed of a BMC material, and the outer circumferential surface of the bushing core (2) is formed as an outer surface of the high-pressure composite bushing (1).
The method according to claim 1,
The bushing core 2 is formed of a BMC material and the outer peripheral surface of the bushing core 2 corresponding to the housing portion 1a and the skirt portion 1b of the high- Wherein the insulating housing 7 made of an insulating material is integrally enclosed by molding and the penetration inserting portion 1c of the high-pressure composite bushing 1 is formed by the outer peripheral surface of the bushing core 2. [ A pillar transformer with integrated bushings.
4. The method according to any one of claims 1 to 3,
Wherein the core conductor (4) located inside the bushing core (2) is inserted in a state where the heat-resistant tubing (4a) is wrapped.
4. The method according to any one of claims 1 to 3,
Wherein the fastening portion (1d) is made of a reinforcing material fastening member (5) having threads inserted in the bushing core (2).
4. The method according to any one of claims 1 to 3,
Wherein the fastening part (1d) is made of a thread (5a) formed on the bushing core (2).

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