KR101919384B1 - A pillar-type transformer in which a current-voltage sensor is integrated - Google Patents

Abstract

The present invention relates to a pole transformer integrated with a current voltage sensor, and more particularly, to a pole transformer integrated with a current voltage sensor which is integrally installed in a low-voltage bushing of the pole transformer to measure a current and a voltage on a load side, continuously maintains tightness of packing between insulators constituting a current voltage sensor to secure insulation stability, and smoothly maintains filtering of an insulating oil in the transformer to prevent insulation breakdown and insulation failure from occurring. The pole transformer comprises: a first connection part (10); a second connection part (20); and a connection part (30).

Description

[0001] The present invention relates to a pillar-type transformer in which a current-voltage sensor is integrated,

The present invention relates to a pillar-type transformer in which a current-voltage sensor is integrated, and more particularly, to a pillar-type transformer integrated with a low-voltage bushing of a pillar-type transformer to measure current and voltage on a load side, The improvement of the insulation stability and the filtering of the insulating oil in the transformer are maintained smoothly so that the improved current voltage sensor is integrated so as to prevent the insulation breakdown or the insulation failure To a pillar-type transformer.

The existing monitoring poultry transformer monitoring and diagnosis method is to observe the distribution transformer through the five senses of the power line and to use the various diagnostic equipments such as the thermal imaging camera and the high frequency diagnosis device to judge the abnormality of the distribution transformer Of-the-line method.

Recently, an on-line monitoring and diagnosis system that combines electric power technology and IT technology has been considered as a preventive diagnosis method of the pillar transformer by removing the above-mentioned conventional off-line method and measuring information such as current, voltage and load factor of the pillar transformer A system has been developed and transmitted to a management server at a remote site via wired / wireless communication. Currently, a large number of research and development and patent registration related thereto are being actively conducted.

However, in order to construct the poultry transformer monitoring and diagnosis system as described above, it is essential to separately install a current and voltage sensor for obtaining the load information of the transformer on the secondary side of the transformer. As a result, ≪ / RTI >

In addition, since the current and voltage sensors and the sensor connecting wires are directly exposed to the outside of the electric pole, there is a possibility that the electric current and the voltage sensor and the sensor connecting wires may cause a trouble between other electric power lines and communication lines.

As a conventional technique for partially solving such problems, Korea Patent No. 10-1126291 (March 03, 2012) has been disclosed.

Korea Patent Registration No. 10-1126291 (March 23, 2012) 'Column-type transformer with integrated current voltage sensor'

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the prior art, and it is an object of the present invention to provide a pneumatic transformer which is capable of measuring a current and a voltage on a load side, To maintain the tightness of the packing between the insulators constituting the transformer, to secure the insulation stability, and to keep the filtering of the insulating oil in the transformer smoothly to prevent the insulation breakdown and insulation failure, The present invention has a main purpose in providing a pillar-type transformer in which a sensor is integrated.

A first inner ring (11) having a different diameter and a first outer ring (12) are arranged to be concentric with each other. The first inner ring (11) and the second inner ring A conductive first contact 13 is formed and a current transformer having a core of the coil winding is cased on the first outer ring 12 and the first low pressure bushing 40 on the side marked with (+) on the sidewall of the pillar transformer A first connection portion (10) through which the central shaft (16) penetrates the first inner ring (11) and contacts the first contact (13); The second inner ring 21 and the second outer ring 22 having different diameters are disposed so as to be concentric with each other. A conductive second contact 23 is formed on the inner wall of the hole of the second inner ring 21, The central axis 26 of the second low-pressure bushing 50 on the side indicated by (-) on the side wall penetrates the second inner ring 21 and is in contact with the second contact point 23, ; And a current sensor unit which connects the first connection unit 10 and the second connection unit 20 and senses a current induced in the coil 15, And a connection unit (30) having a circuit including a voltage sensor unit for sensing a voltage between the current sensor and the voltage sensor unit, the current sensor comprising:

The first and second low pressure bushings 40 and 50 have inner and outer insulators 42 and 47 sandwiched by packings 41 and 46, 26 are passed from the side of the outer insulator 47 to the side of the inner insulator 42. A buffer washer 43 and a metal washer 44 are inserted into the respective end portions of the through- 45 are fastened;

The spacing holder 100 may further include a spacing holder 100 between the packings 41 and 46. The spacing holder 100 may be formed in a shape corresponding to the packing 41 or 46, A plurality of fastening holes 110 are formed at regular intervals along the circumferential direction of the fastening hole 110. The fastening hole 110 is formed with a thread on an inner diameter of the fastening hole 110, And a fastening hole 120 to be grounded is screwed.

At this time, the fastening tool 120 is formed in a cylindrical shape, and an outer diameter thread 122 is formed on the outer diameter of the fastening hole 110 so as to be screwed to the fastening hole 110. In the inner diameter, An inner diameter thread 124 of -3 pitch is formed; A coil spring 130 is inserted into the inner diameter of the fastener 120; In the outer diameter of the fastening end portion of the flow through hole 140, a flow hole thread 142 having a pitch of 2 to 3 is formed at both sides of the fastening hole 120, 140 are arranged to exceed the three pitches and are elastically caused to flow by the coil spring 130 when the screws are fastened.

The inner diameter of the fastener 120 also has a pair of tool protrusions 126 symmetrical in the radial direction at the middle of the length.

The pillar-shaped transformer is further provided with an insulating oil filtering unit 200 for filtering while circulating the insulating oil.

According to the present invention, it is possible to measure the current and voltage on the load side integrally with the low-pressure bushing of the pillar transformer, and to maintain the tightness of the packing between the insulators constituting the current voltage sensor, And further, the filtering of the insulating oil in the transformer is smoothly maintained, so that an effect of preventing insulation breakdown or insulation failure can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing the configuration of a current voltage sensor incorporated in a pneumatic transformer according to the present invention; FIG.
2 is a circuit diagram of the internal circuit of FIG.
Fig. 3 is a view showing that a current voltage sensor according to the present invention is integrally installed in a pillar-shaped transformer; Fig.
4 is an assembled view of a low pressure bushing.
5 is an exploded view of a low pressure bushing.
FIG. 6 is a view illustrating an interval gap provided in the current voltage sensor of the pneumatic transformer according to the present invention. FIG.
7 is a conceptual diagram showing an installation example of an insulating oil filtering unit installed in a pillar transformer according to the present invention.
8 is an illustration of an insulating oil filtering unit of Fig.

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

Before describing the present invention, the following specific structural or functional descriptions are merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

The current voltage sensor integrated in the pneumatic transformer according to the present invention can be implemented as shown in FIG. 1 and is integrally installed between both ends of the first low-pressure bushing and the second low-pressure bushing of the pillar transformer.

The pillar transformer is a transformer installed on the pole to lower the extra high voltage of the AC distribution line to low voltage.

The pillar transformer has an extra-high-pressure bushing installed to introduce extra-high pressure from an AC distribution line and a low-pressure bushing installed to supply low-pressure internal power to the load.

The punch-type transformer in which the current voltage sensor according to the present invention is integrated is provided integrally with the low-pressure bushing.

1, the punching transformer in which the current voltage sensor according to the present invention is integrated includes a first connecting portion 10 coupled with a first low-pressure bushing, a second connecting portion coupled with a second low-pressure bushing, 10 and the second connection part 20 and has a connection part 30 in which an internal circuit is cased.

The first connecting portion 10 is disposed so that the first inner ring 11 and the first outer ring 12 having different diameters are concentric with each other. A current transformer 13 (corresponding to T1 in Fig. 2) in which the core 14 is wound by the coil 15 is cased on the first outer ring 12 and the center axis 16 of the first low-pressure bushing 16 Has a configuration that penetrates the first inner ring 11 and contacts the first contact 13.

The second connection portion 20 is disposed so that the second inner ring 21 and the second outer ring 22 having different diameters are concentric with each other and the second inner ring 21 is connected to the conductive second contact And the center shaft 26 of the second low-pressure bushing is in contact with the second contact 23 while passing through the second inner ring 21. The second low-

The first connection part 10 and the second connection part 20 are connected by a connection part 30 and the connection part 30 has an internal circuit 32 built therein.

The internal circuit 32 has contacts A and B connected to both ends of the coil 15 of the first connection part 10 and has a contact C connected to the first contact 13 of the first connection part 10 And a contact point D connected to the second contact point 23 of the second connection part 20.

Here, the contacts A and B of the internal circuit 32 are contacts for sensing current, and the contacts C and D are contacts for sensing voltage.

The internal circuit 32 has terminals CT1 and CT2 for outputting the result of sensing the current, and terminals PT1 and PT2 for outputting the result of sensing the voltage.

The internal circuit 32 of the above-described connecting portion 30 has the wiring structure as shown in Fig.

Referring to FIG. 2, the internal circuit 32 includes a current sensor portion 34 and a voltage sensor portion 36.

The current sensor unit 34 includes a current transformer T1 having a coil 15 formed in the core 14 to sense a current flowing from the terminal corresponding to the center axis 16 of the first low- A varistor element Rv1 connected between both ends of the coil 15, that is, between the contacts A and B, for absorbing the surge, and a resistor R1 connected in parallel with the varistor element Rv1.

Here, the current ratio of the current transformer T1 can be determined according to the winding ratio, and the resistor R1 is a sharing resistor for converting the current into a voltage. Both ends of the resistor R1 are connected to the output To the terminals CT1 and CT2.

The output of the current sensor unit 34 is determined by the voltage across the terminals CT1 and CT2 and the output current of the pillar transformer, that is, the output voltage of the first low-voltage bushing 40, When the current flowing to the central axis 16 is i (t) [A], the following Equation (1) can be established.

&Quot; (1) "

Vc (t) = 1 / N * R1 * i (t) [V]

Here, vc (t) is the voltage applied to the resistor R1, that is, the output voltage of the current sensor unit 34. [

The resistor R1 is an element for converting the current sensed by the current sensor unit 34 into a voltage and can be removed if necessary in accordance with the manner of use of the current sensor. When the resistor R1 is removed, The output can be obtained in the form of a current value.

In this case, the output of the current sensor can be calculated as shown in Equation (2) below.

 &Quot; (2) "

ic (t) = 1 / N * i (t) [A]

Here, ic (t) is a current value output from the current sensor unit 34 in a state where the resistor R1 is removed.

On the other hand, the voltage sensor unit 36 is connected to the first contact 13 (corresponding to the contact C in Figs. 1 and 2) and the second low-pressure bushing A varistor element Rv2 connected between a second contact 23 (corresponding to the contact D in Figs. 1 and 2) that is in contact with the central axis 26 of the first and second sides And a transformer T2 for inducing and outputting a current flowing in a primary side connected in parallel with the varistor element Vr2 according to the winding ratio to the secondary side.

The output of the voltage sensor unit 36 is determined by the voltage applied across the terminals PT1 and PT2 and the output voltage of the pillar transformer is v (t) [ V], the following Equation (3) can be established.

Here, the output voltage of the pneumatic transformer corresponds to the potential difference between the center axis 16 of the first low-pressure bushing 40 and the center axis 26 of the second low-pressure bushing 50. [

&Quot; (3) "

vp (t) = M2 / M1 * v (t) [V]

Here, vp (t) is the output voltage of the voltage sensor unit 36. [

The transformer T2 configured in the voltage sensor unit 36 may be used to physically insulate the voltage sensor unit 36 from the transformer side and the voltage sensor unit 36 may be used in a transformer T2) can be removed and the secondary side voltage of the transformer can be directly connected to the output of the voltage sensor.

A preferred embodiment of the current voltage sensor integrated into the pillar transformer according to the present invention as shown in FIGS. 1 and 2 may be combined with the pillar type transformer as shown in FIG.

3, the low-pressure bushing 40, 50 is installed on the side wall 60 of the pillar transformer and the first low-pressure bushing 40 is connected to the side wall of the pillar transformer by a central axis 16 And the second low-pressure bushing 50 has the central axis 26 of the terminal specified by (-) on the pillar transformer side wall.

The inner insulator 42 is disposed inside the side wall 60 of the pillar transformer through a packing 41 for waterproofing and the inner insulator 42 is connected to the center axis 16, A nut 45 is screwed to an end of the center shaft 16 and an inner insulator 42 having a ceramic material is inserted between the insulator 42 and the nut 45 And a metal washer 44 for supporting the buffer washer 43 and the engaged state.

A first connecting portion 10 is provided between the packing 46 and the side wall of the pillar transformer to the outside of the side wall 60. An outer insulator 47 is provided outside the packing 46, A head 48 is formed which is an extended end of the central shaft 16.

The first low-pressure bushing 40 described above can be constructed as shown in Figs. 4 and 5, and the head 48 has a coupling structure that can be easily connected to the load. The structure of the second low pressure bushing 50 adjacent to the first low pressure bushing 40 and provided with the second connection portion 20 is the same as that of the first low pressure bushing 40. Therefore, The connection portion 30 between the connection portion 10 and the second connection portion 20 may be configured to be in close contact with the outer side wall 60 of the pillar transformer.

The pillar transformer having the integrated current voltage sensor according to the present invention constructed as described above can construct a pillar transformer monitoring and diagnosis system without installing a separate current and voltage sensor.

Further, since the current voltage sensor is integrally formed with the pillar-form transformer, the management and cosmetic advantage can be achieved.

In addition, in the present invention, as in the example of FIG. 6, the apparatus further includes a gap holder 100.

The gap holding tool 100 is a member interposed between the packings 41 and 46, and is formed of an insulating synthetic resin so as to have an insulating property.

That is, since the packings 41 and 46 are made mainly of a rubber material, they deteriorate and become hard when used for a long time. Particularly, in the case of being disposed in a state exposed to the outside air as in the present invention, the deterioration speed is further accelerated.

As a result, the thickness of the packings 41, 46 is shrunk and loosened. As a result, tight connection between the inner insulator 42 and the outer insulator 47 becomes difficult, which may deteriorate the insulating property.

In order to prevent this, the present invention further includes a gap holding tool (100).

The gap holding tool 100 is formed in a shape corresponding to the packing 41 and 46 as shown in the figure.

However, a plurality of fastening holes 110 are formed in the gap holding tool 100 at predetermined intervals along the circumferential direction.

The fastening hole 110 has a structure in which a thread is formed in an inner diameter.

A fastener 120 is screwed into the fastening hole 110.

At this time, the fastening tool 120 is formed in a cylindrical shape, and an outer diameter thread 122 is formed on the outer diameter of the fastening hole 110 so as to be screwed to the fastening hole 110. In the inner diameter, An inner diameter thread 124 of -3 pitch is formed.

A pair of tool protrusions 126 are protruded in the inner diameter of the fastener 120 so as to be symmetrical in the radial direction.

Therefore, each of the inner diameter threads 124 on both sides of the tool projection 126 is formed as a threadless private part.

The reason why the tool protrusion 126 is formed is to make it easier to fasten the fastener 120 to the fastener 110. The fastener 120 has a cylindrical shape and an outer diameter thread 122 So that it is not easy to fasten them to the fastening holes 110. In order to solve this problem, the tool protrusion 126 is formed, and a fitting tool is inserted into the tool protrusion 126 to rotate the fastener 120.

In addition, a coil spring 130 is inserted into the inner diameter of the fastener 120, and the tool protrusion 126 also serves to fix the center of the coil spring 130.

That is, when the coil spring 130 is inserted into the inner diameter and rotated, the coil spring 130 rides over the tool protrusion 126. When the center of the coil spring 130 is positioned on the tool protrusion 126, The center portion of the drooping coil spring 130 is engaged with the tool protrusion 126 so that the coil spring 130 can be elastically deformed at both sides around the tool protrusion 126 without being detached.

In this state, a flow hole (140) having a rounded front end face is screwed on both sides of the fastening tool (120).

In this case, a flow port thread 142 of 2-3 pitches is formed on the outer diameter of the fastening end of the flow through hole 140.

Therefore, when the flow port 140 is rotated more than three pitches, the flow port 140 passes over the inner diameter thread 124, so that the flow port 140 can not freely move in the inner diameter of the fastener 120 do.

Since the one end of the coil spring 130 is grounded to the insertion end face of the flow hole 140, the flow hole 140 can be elastically flown in the inner diameter, can not do it.

Accordingly, when the gap holding tool 100 having such a structure is provided between the packing 41 and 46, each of the packing 41 and 46 maintains a close tight contact relationship with the gap holding tool 100, 41 and 46, even if deterioration of the flow passage 140 occurs due to the elastic movement of the flow passage 140, the tight contact state can be maintained smoothly.

Since the spacing tool 100 should have insulation, durability, heat resistance, waterproofness and elasticity, 5% by weight of transparent silica gel, 10% by weight of PEEK resin, 15% by weight of hydrogen silsesquioxane resin, And molded into a synthetic resin composition comprising a polyurethane resin.

At this time, the silica gel maintains transparency while increasing the moisture resistance and water resistance, while the PEEK (Polyetheretherketone) resin increases the heat resistance, chemical resistance and abrasion resistance to maintain the longevity of the housing and to maintain the pollution resistance, while the remaining synthetic resin solution maintains transparency Thereby enhancing durability.

The hydrogen silsesquioxane resin is a polymer whose main skeleton is composed of a trifunctional siloxane unit. In terms of molecular structure, a hydroxyl group, a triorganosiloxy group, or a dimethylhydrogensiloxy group is substituted at the terminal And it exhibits high insulation characteristics when heated for molding.

In addition, the polyurethane resin can achieve longevity improvement due to high resistance to deterioration while maintaining an elastic force as a base resin.

In addition, the present invention may further include an insulating oil filtering unit 200 as shown in FIG. 7 to stably maintain the pillar transformer so that the current voltage sensor can be smoothly and accurately operated.

For example, the insulating oil filtering unit 200 filters impurities generated in the insulating oil in the pillar transformer to prevent deterioration of insulation and heat dissipation performance.

These impurities are naturally generated inside the pillar transformer by virtue of the carbon constituent of the core, although there are examples of external influx.

The insulating oil filtering unit 200 according to the present invention is not a structure that is difficult to replace the filter as in the past, but has a structure that facilitates the replacement and facilitates the filtering. In particular, the insulating oil filtering unit 200 has a unique upwardly- , It has a new structure which is quite different from the conventional filter which can simplify the installation structure, increase the filtering effect, and facilitate the replacement of the filter at the same time.

That is, a ROM is provided on the upper side of the pillar transformer TR, and a suction pipe P1 and a discharge pipe P2 are connected to the oil compartment ROM. These pipes are connected to the insulating oil filtering unit 200 And is configured to filter while circulating the oil inside the pillar transformer TR, that is, the insulating oil.

In this case, the insulating oil filtering unit 200 includes a unit body 210 having an upper portion opened and a spraying guide pipe 220 formed at the center thereof, as shown in FIG. 8; A pump 230 installed in the spray guide pipe 220 and connected to the suction pipe P1; A cylindrical metal net 240 having a center passageway so as to be fitted into the jet guide pipe 220; A plurality of spherical silica gel 250 filled in the metal net 240; And a hemispherical cover (260) screwed to the open top of the unit body (210).

The bottom surface of the unit body 210 is tapered to one side so that the center and the periphery have a step difference D, and the discharge pipe P2 is connected to the tapered side.

In addition, a transparent window 270 may be further formed in a part of the circumference of the unit body 210. When the color of the silica gel 250 is changed by the humidity of the silica gel 250, the transparent window 270 is visually checked So that they can be replaced.

In addition, the driving of the pump 230 may be controlled by a separate controller (not shown), and the power applied to the pump 230 may also be performed by the controller. However, since these are well known, the description is omitted in the present invention.

As described above, the concept of the filter according to the present invention is not a mesh filter having only a simple filtration function of a mesh type, which is generally disclosed, but a porous membrane filter which can simultaneously remove impurities and moisture, The moisture is completely absorbed and removed to the water content, so that the insulation breakdown phenomenon due to the inflow of water can be prevented.

In addition, in the present invention, the insulating oil to be filtered is blown upward through the blowout guide pipe 220, the injected insulating oil is scattered radially after hitting the inner ceiling of the cover 260, and then flows down through the silica gel 250, So as to increase the efficiency of the impurity separation.

At this time, it is preferable that a separate discharge pipe (TCH) connected to the discharge end of the pump 230 is further piped and used in the discharge guide pipe 220.

The filtered insulating oil collects toward one side of the bottom surface of the unit body 210, and then flows into the pillar transformer TR again by its own weight.

With this structure, stable, smooth and efficient filtering can be maintained.

20: Transformer 21: High pressure bushing
22: Low pressure bushing 23:
24: salvage ring 25: respiratory tract
26: Oil level meter 27: Inlet valve
28: Radiator 29: Oil thermometer
30: transformer case 31,35: corner reducer
32: Hand hole 33: Winding thermometer

Claims (1)

The first inner ring 11 and the first outer ring 12 having different diameters are arranged so as to be concentric with each other and the first conductive contact 13 is formed on the inner wall of the hole of the first inner ring 11, And the center axis 16 of the first low-pressure bushing 40 on the side marked with (+) on the side of the pillar-shaped transformer is connected to the first inner ring 11 (10) passing through the first contact (13) and contacting the first contact (13); The second inner ring 21 and the second outer ring 22 having different diameters are disposed so as to be concentric with each other. A conductive second contact 23 is formed on the inner wall of the hole of the second inner ring 21, The central axis 26 of the second low-pressure bushing 50 on the side indicated by (-) on the side wall penetrates the second inner ring 21 and is in contact with the second contact point 23, ; And a current sensor unit which connects the first connection unit 10 and the second connection unit 20 and senses a current induced in the coil 15, And a connection unit (30) having a circuit including a voltage sensor unit for sensing a voltage between the current sensor and the voltage sensor unit, the current sensor comprising:
The first and second low pressure bushings 40 and 50 have inner and outer insulators 42 and 47 sandwiched by packings 41 and 46, 26 are passed from the side of the outer insulator 47 to the side of the inner insulator 42. A buffer washer 43 and a metal washer 44 are inserted into the respective end portions of the through- 45 are fastened;
The spacing holder 100 may further include a spacing holder 100 between the packings 41 and 46. The spacing holder 100 may be formed in a shape corresponding to the packing 41 or 46, A plurality of fastening holes 110 are formed at regular intervals along the circumferential direction of the fastening hole 110. The fastening hole 110 is formed with a thread on an inner diameter of the fastening hole 110, The fastening member 120 to be grounded is screwed,
The fastener 120 is formed in a cylindrical shape and an outer diameter thread 122 is formed on the outer diameter so as to be screwed to the fastener hole 110 over its entire length. An internal thread 124 of pitch is formed;
A coil spring 130 is inserted into the inner diameter of the fastener 120;
In the outer diameter of the fastening end portion of the flow through hole 140, a flow hole thread 142 having a pitch of 2 to 3 is formed at both sides of the fastening hole 120, 140) is greater than three pitches and is elastically caused to flow by the coil spring (130) when the screw is fastened.

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