KR20160088565A - Zero Load Tap For Explosion Transformer - Google Patents

Abstract

The present invention relates to a transformer having a plurality of multipoint connection modules and a driving device operating a switch device. Each of the multipoint connection modules includes: a support plate; a plurality of fixing contact points formed at regular intervals in an arc direction on one surface of the support plate; and a rotating contact point (530) connected to each of the fixing contact points by being rotated in the center of the support plate. A shaft joint portion is formed to be collinear with each of the rotating contact points (530) such that the rotating contact points (530) of each of the multipoint connection modules can be simultaneously rotated. An electrical connection point of a tap can be easily moved to prevent generation of resistance, thereby increasing efficiency. Further, the same shaft can be used for a plurality of taps to reduce a deviation of each of the taps. Further, an arc can be prevented near a coupling portion of each tap, thereby significantly reducing a failure rate. Further, dustproof, waterproof, and airtight structures can be adopted in the driving device, thereby securing quality and stability.

Description

{Zero Load Tap For Explosion Transformer}

The present invention relates to a no-load underground tap-changer for an explosion-proof transformer, and relates to a no-load under-tap air vent for an explosion-proof transformer in which an electrical connection point of a tab is easily moved and electrical resistance is not generated.

A transformer is a device used to increase or decrease the AC voltage using the mutual induction principle. The transformer utilizes the principle of electromagnet induction to raise or lower a particular voltage level to a higher or lower voltage level.

As is known, electromagnetism induces a voltage on a conductor placed in a variable magnetic field. In a transformer, the variable magnetic field is generated by applying an alternating current to the transformer coil, which is generally indicated as the main coil or winding.

This main winding is typically coupled to a secondary winding or coil, and a main winding and a secondary winding, each comprising a plurality of turns, are wound around the magnetic core. When an alternating current is applied to the main winding, a variable magnetic flux is induced in the core and a voltage is generated in the secondary winding.

In addition to the always inevitable losses, the voltage ratio across the main winding and the secondary winding is ideally equal to the ratio between the number of turns in the main winding and the number of turns in the secondary winding. Therefore, by varying the ratio between the number of turns of the main winding and the number of turns of the secondary windings, the voltage ratio can be varied. In this way it is possible, for example, to control or regulate the voltage across the secondary winding representing the output voltage supplied by the transformer for any load connected to the transformer.

To this end, the transformers have a specific connection, referred to as a tap in the transformer industry. The transformer tap is an electrical connection point that is positioned along either the main winding and / or the secondary windings and allows the number of turns to be selected. The selection of the used tab is made through a tap changer mechanism. For example,

The change mechanism selects the turn at the secondary winding coil to be connected to the load circuit, thereby adjusting the output voltage by varying the ratio of turns at the transformer.

Presently, a certain number of single connection tabs are provided for each coil, for example, each attached to a corresponding turn in the coil and then exposed to the face of the coil, respectively. Typically, each tab is comprised of a lug or flat bar and is, in most cases, welded to the inside of the coil. The taps are then connected by a cable, typically on the face of each coil.

In the transformer, it is preferable that the transformer maintains the voltage of the secondary side (low-voltage side or the load side) at a prescribed rated voltage, but the actual transformer does not have a constant receiving voltage (primary voltage) Since the internal voltage drop of the transformer itself varies continuously depending on the magnitude of the current and the power factor, the output voltage of the secondary side also fluctuates. It is a tap that is provided so that the secondary voltage fluctuating as described above can be adjusted to be close to the rated voltage. The tap is mainly installed in the primary winding of the transformer because it is possible to prevent the iron core from being supersaturated even when the receiving voltage (primary voltage) of the transformer becomes an overvoltage exceeding the rated voltage, and the current flowing in the primary It is possible to reduce the sectional area of the tabs and the tab lead-out leads, which is economical.

The relationship between the transformer voltage and the number of windings is expressed by V1 and N1, where V1 and N2 are the voltage and the number of windings of the primary winding, respectively (V1 / N1 ) = (V2 / N2), the voltage per turn (volts / turn) of the primary and secondary windings is always constant. Here, it can be seen that the secondary voltage V2 is changed in inverse proportion to the number of turns N1 of the primary winding (where V1 and N2 are constant) This is the principle of the difference voltage adjustment.

The transformer taps have a higher number of windings (number of turns) in proportion to the higher voltage taps and a smaller number of turns in the lower voltage taps.

Therefore, when the secondary voltage V2 becomes higher than the rated voltage, when the tap of the primary winding is switched to the higher voltage tap, the number of turns N1 of the primary winding increases, so that the voltage per turn decreases. The difference voltage V2 also decreases.

On the contrary, when the secondary voltage V2 is lower than the rated voltage, the number of turns N1 of the primary winding decreases when the tap of the primary winding is switched to the low voltage tap, so that the voltage per one turn increases and the secondary voltage V2 ) Is increased.

There are two types of tap ventilation: NLTC (No Load Tap Changer) and OLTC (On Load Tap Changer). The NLTC (installed in the high-voltage transformer) is a device that can switch the tap only when the transformer is non-voltage. It is usually used to obtain the desired secondary voltage by switching the tap according to the receiving voltage when installing the transformer. The OLTC is a device that can switch taps during operation of a transformer installed in an ultra-high voltage power transformer. The transformer in operation is designed to reduce the voltage fluctuation of the transformer due to voltage fluctuation (ie, primary voltage change) The secondary voltage fluctuates. However, by installing the OLTC, such a secondary voltage fluctuation can be minimized.

The transformer as described above has only a single connection from the drive unit to the electrical connection point of the tap, so that multiple connection tabs have not been used, and the accuracy for realizing multiple connection tabs has been reduced.

This use of a single connection tab also has some drawbacks, in particular with respect to the time required in the coil winding manufacturing process, the content of the material used, and the size of the transformer enclosure depth. Therefore, there is a need to provide a solution that allows for optimization of the manufacturing time in the coil winding process, minimizing the space required inside the transformer enclosure and reducing the material cost associated with the transformer.

Also, the shape of the electrical connection points of the tabs can not be easily moved, resulting in a problem of high resistance.

Further, due to the characteristics of gears and assemblies, there has been a problem of loss of rotation due to backlash.

Also, there has been a problem that a plurality of tabs can not simultaneously control connection points.

In addition, there has been a problem that an arc is generated at the fastening portion in the tab engagement.

Further, the airtightness is not maintained in the structure for keeping the airtightness in the driving device, and the operation and safety have become a problem.

A multi-point connection module for a transformer coil and a transformer comprising such a module.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide a multi-connection structure in which the electrical connection points of the tabs are easily moved, the loss of the amount of rotation is overcome, And to provide a no-load tap changer for an explosion-proof transformer.

It is also an object of the present invention to provide a no-load tap changer for an explosion-proof transformer which can use the same shaft so that a plurality of tabs can simultaneously control the connection points.

It is also an object of the present invention to provide a no-load under-tap air vent for an explosion-proof transformer which is manufactured so that an arc is not generated at a portion where the tab is coupled.

It is also an object of the present invention to provide a no-load tap changer for an explosion-proof transformer that improves operability and safety by fabricating a drive device with a dustproof and hermetic structure.

In order to achieve the above object, the present invention provides a transformer including a switching device and a driving device for operating the switching device, wherein the switching device comprises a tap switching driving member, A bevel gear member coupled to the drive connection member, a Geneva gear portion, a shaft coupling member that is gear-connected to the bevel gear member, the hub coupling member being coupled to the Geneva gear portion, And a multi-point connection module coupled to the insulation-shifting member, wherein a plurality of the coupling members are continuously connected to form a plurality of multi-point connection modules.

The multi-point connection module is composed of a support plate, a fixed contact formed on the one surface of the support plate at a predetermined interval in the circumferential direction, and a rotary contact rotated at the center of the support plate and connected to each of the fixed contacts .

The shaft coupling member is formed in a straight line with each of the rotation contacts so as to simultaneously rotate the rotation contacts of the multi-point connection module.

The inner circumferential surface of the fixed contact is arc-shaped, and both ends of the rotary contact correspond to the inner circumferential surface shape of the fixed contact so that the electrical resistance against rotation is reduced.

The fixing contact is formed with a coupling groove through which the coupling bolt is engaged with the supporting plate and does not protrude outside the coupling bolt head and the fixed contact, No arc is generated due to collision.

The shaft transfer portion is characterized in that the first coupling set and the second coupling set are formed at both ends of the shaft transfer pipe so that the first coupling set and the second coupling set are located so as to be positioned on the straight line.

The driving device is characterized in that a gasket and an oil chamber are provided on the outside of the main operating part, and the inside and outside of the driving part are kept airtight.

The insulating shaft member includes a Geneva gear universal joint coupled to the Geneva gear unit, an involute spline variable member connected to the Geneva gear universal joint and varied in multiple stages, and an involute spline variable member coupled to the involute spline variable member A first insulation member connected to the insulation shaft and insulated from electricity generated in the multi-point connection module 500, and a connection universal joint connecting the first insulation member and the multi-point connection module .

Further, a second insulating member is further provided between the insulating shaft and the connection universal joint.

The first coupling set and the second coupling set include a coupling shaft connected to the Geneva gear portion, a universal joint coupled to an end of the coupling shaft, an insertion groove for inserting the shaft transmitting pipe, And is formed of a cell joint that is pin-coupled.

The involute spline variable member is characterized in that it is supported by an involute spline shaft.

Further, the Geneva gear portion is further provided with a contact rotation amount compensating member.

As described above, since the electrical connection points of the tabs are easily moved, resistance is not generated and efficiency is increased.

Further, since a plurality of taps use the same axis, the respective deviations are reduced.

Further, an arc is not generated at a portion where the tab is coupled, and the defect rate is remarkably lowered.

Further, the driving device is provided with dustproof, waterproof, and airtight structure, which ensures the quality and stability.

1 is a sectional view showing a no-load tap changer for an explosion-proof transformer according to the present invention;
2 is a cross-sectional view showing an axial transfer portion of a no-load tapped air passage for an explosion-proof transformer according to the present invention.
3 is a cross-sectional view showing a multi-point connection module of no-load under-tap air ventilation for an explosion-proof transformer according to the present invention.
4 is a front view showing a driving apparatus according to the present invention.
5 is a side view showing a stationary contact of a no-load under-tap air vent for an explosion-proof transformer according to the present invention.
6 is a side view showing a driving apparatus according to the present invention.

Hereinafter, a no-load tap changer for an explosion-proof transformer will be described with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view illustrating a no-load tap changer for an explosion-proof transformer according to the present invention, FIG. 2 is a cross- 4 is a front view showing a driving apparatus according to the present invention, and FIG. 5 is a side view showing a stationary contact of the no-load under-tap air vent for the explosion-proof transformer according to the present invention And Fig. 6 is a side view showing the driving apparatus according to the present invention.

1 to 5, the present invention is a transformer including a switching device and a driving device 600 for operating the switching device, wherein the switching device comprises a tap switching driving member 100, A drive link member 150 having one side connected to the tap change driving member 100 and a bevel gear member 200 coupled with the drive link member 150. The Geneva gear unit 350, An insulating shaft member 400 coupled to the Geneva gear unit 350 and a shaft connecting member 340 coupled to the bevel gear member 200 to be engaged with the bevel gear member 200, And a multi-point connection module 500 coupled to the multi-point connection module 400, wherein a plurality of the coupling members 300 are continuously connected to form a plurality of the multi-point connection modules 500.

Here, the driving device 600 is a part for operating the switching device. The operation principle of the switching device is introduced in the prior art, and a detailed description thereof will be omitted.

Hereinafter, each configuration will be described in detail.

The switching device according to the present invention includes a tap switching drive member 100, a drive link member 150, a bevel gear member 200, a shaft coupling member 300, an insulating shift member 400, And a connection module 500.

The tab switching driving member 100 is actuated by the driving device so that the continuous driving mechanism of the bevel gear member 200 and the shaft coupling member 300 in the driving connecting member 150 finally drives the insulating shifting member 100. [ And the displacement of the multi-point connection module 500 is controlled through the connection part 400. That is, according to the present invention, the displacement of the multi-point connection module 500 is controlled and the transforming operation proceeds.

The driving connection member 150 is connected to the tap switching driving member 100 in a pipe shape and is gear-connected to the bevel gear member 200 on the other side. Therefore, the gear combination is used to connect the transmission of the force by the operation of the tap-change driving member 100. [

Here, the driving connection member 150 is connected to both the tab switching driving member 100 and the bevel gear as a coupling at both ends.

That is, the driving connection member 150 allows the mechanical operation to be continuously connected to the bevel gear member 200 to the tab switching driving member 100.

The bevel gear member 200 is gear-engaged with the other side of the driving connection member 150 to rotate the direction of the transmission shaft by 90 °. Meanwhile, since the configuration of the bevel gear is a known technology, a detailed description will be omitted.

The shaft coupling member 300 includes a Geneva gear portion 350 and a pipe-shaped shaft transmitting portion 340 so as to be gear-engaged with the bevel gear member 200.

Here, a plurality of the coupling members 300 are continuously connected to form a plurality of the multi-point connection modules 500.

Accordingly, as the shaft coupling member 300 is continuously aligned, the multi-point connection module 500 performs the variable pressure change operation without error by the tap switching drive member 100.

The Geneva gear unit 350 interlocks with the insulation gear member 400 and the shaft transmission unit 340 connects the Geneva gear units 350 to each other to form a plurality of shaft joints 300. [ do.

The insulated shift member 400 is a member for insulating electrical or electric power generated in the multi-point connection module 500.

Here, it is natural that the insulation displacement member 400 is made of an insulating material for the insulation strength between the tap and the ground when the multi-point connection module 500 is adjacent thereto.

The multi-point connection module 500 operates the driving device 600 to allow the user to perform various transformations so that the tap switching driving member 100, the driving connecting member 150, the bevel gear member 200, The rotational contact 530, which will be described later, is caused to rotate by the transmission of the continuous mechanical force to the insulating housing member 300 and the insulating shift member 400.

Preferably, the multi-point connection module 500 includes a support plate 510, a fixed contact 520 formed at a predetermined interval in the circumferential direction on the support plate 510, And a rotary contact 530 connected to each of the fixed contacts 520 by being rotated at the center.

The multi-point connection module 500 includes a support plate 510 and a fixed contact 520 and a rotary contact 530 provided on the support plate 510.

The support plate 510 is made of an EPOXY material having high strength and hardness, and is particularly excellent in insulation, and can cope with an arc or various electrical problems.

The support plates 510 are spaced apart from each other by a predetermined distance in the switching device. In the present invention, three support plates 510 are provided.

The support plate 510 includes a fixed contact 520 and a rotatable contact 530 on one side. The support plate 510 is provided with a shaft coupling member 300 for rotating the rotary contact 530 on the other surface thereof.

The stationary contact 520 is fixed to one surface of the support plate 510.

Here, the fixed contacts 520 are spaced apart from a virtual arc of one side of the support plate 510 by a predetermined distance, and the number of the fixed contacts 520 is usually three to seven.

The rotation contact 530 is rotatably installed on one side of the support plate 510. It is a matter of course that the fixed contact 520 and the rotary contact 530 are equally installed in a plurality of support plates 510.

Here, the rotary contact 530 is installed at a center of a virtual arc of the support plate 510, and is rotated in a clamping manner, and touches the fixed contact 520 by rotation.

Accordingly, a voltage is applied to the fixed contact 520 where the rotating contact 530 is located, and the voltage is changed.

For example, in the case of the fixed contact 520 spaced at a constant interval of 60 °, if the rotary contact 530 is positioned at 60 to 120 °, the electric power is applied once, and the shaft is electrically driven When the rotary contact 530 is rotated at 120 to 180 degrees, electrical application is performed so that the second voltage is changed. Here, the first transformer and the second transformer can be variously changed according to the use specification, and various types of transforming are possible as the number of the fixed contacts 520 increases.

The above-mentioned portions will not be described in detail in the general manner.

Preferably, the shaft coupling member 300 is formed to be in line with each of the rotation contacts 530 so as to simultaneously rotate the rotation contacts 530 of the multi-point connection module 500.

This is because, in the related art, a plurality of the coupling members 300 are connected and an error is generated in the rotation angle of the rotary contact 530 due to a deviation of connected portions, So that the following rotary contact 530 is rotated accurately.

More preferably, the shaft transfer portion 340 is formed such that the first coupling set 310 and the second coupling set 320 are formed at both ends of the shaft transfer pipe 330, and the first coupling set 310 And the second coupling set 320 are connected so as to be positioned on the straight line of the Geneva gear portion 350.

The first coupling set 310 and the second coupling set 320 are coupled to both ends of the shaft transfer pipe 330 in order to connect the shaft transfer units 340 with each other, The first coupling set 310 continuously connects the Geneva gear portion 350 located at one side with the Geneva gear portion 350 located at the other side of the second coupling set 320, .

Particularly, the first coupling set 310 and the second coupling set 320 include a connecting shaft 372 connected to the Geneva gear portion 350 and a universal coupling portion 372 coupled to the end of the connecting shaft 372 And a cell joint 376 formed with an insertion groove for inserting the shaft transfer pipe 330 and pin-coupled with the universal joint 374.

The coupling shaft 372 is connected to the Geneva gear unit 350 in order to rotate the shaft coupling unit 300 without any error in the same signal. However, since the coupling shaft 372 is connected to the Geneva gear unit 350, The connecting shaft 372 of the bevel gear 300 is coupled to the bevel gear member 200 and the remaining connecting shaft 372 is coupled to the Geneva gear unit 350.

The connection shaft 372 is coupled with a universal joint 374 that is rotatable, and the universal joint 374 is connected to the cell joint 376 having the insertion groove formed therein.

In this case, the cell joint 376 is formed with a rectangular or circular groove insertion groove on one side thereof, and the shaft transmission pipe 330 is inserted into the insertion groove to receive power or voltage.

Preferably, the inner circumferential surface of the stationary contact 520 is arc-shaped, and both ends of the rotary contact 530 correspond to the inner circumferential surface shape of the stationary contact 520 to reduce the electrical resistance against rotation .

This is because the fixed contact 520 is installed at a predetermined interval in the imaginary circular arc of the support plate 510 and the rotation contact 530 is also rotated at the center of the support plate 510, The contact 520 and the rotating contact 530 should be smoothly contacted with each other.

Accordingly, the inner circumferential surface of the fixed contact 520 is formed in a round chevron shape, and both ends of the rotary contact 530 are formed in a round shape corresponding to the inner circumferential surface shape of the fixed contact 520, .

The fixing contact 520 is formed with a coupling groove 522 through which the coupling bolt 524 is coupled with the supporting plate 510 and the coupling bolt 524 is coupled with the supporting plate 510, So that no arc is generated due to collision with the head of the coupling bolt 524 when a voltage is applied.

This is because a high voltage is generated in the transformer, and arcing occurs frequently due to the collision between the conductor and the conductor.

However, since the bolt protrudes from the reference surface of the fixed contact 520, a problem arises in that a lot of malfunctions are generated due to the collision of various conductor parts. Has come.

In the present invention, an engaging groove 522 corresponding to the thickness of the engaging bolt 524 is inserted into the fixed contact 520, and the engaging bolt 524 is inserted into the engaging groove 522 to form the fixed contact 520 Is coupled to the support plate 510.

The gasket 610 and the oil chamber 620 are installed outside the main operation part of the driving device 600 so that the inside and the outside of the driving device 600 are hermetically maintained.

This has been a problem in that a part of the driving device 600 is opened, and water or various foreign substances are drawn into the open space into the transformer. The foreign object was most likely to be drawn along the edge of the normal driving device 600. [

Accordingly, the driving device 600 is provided with a gasket 610 and an oil chamber 620 at the outside of the main operating part, and the inside and outside of the driving device 600 are hermetically sealed, which is effective for using the transformer for a long time.

Particularly, the driving device 600 further includes a contact rotation amount compensating member 605.

When the handle 630 of the driving device 600 is rotated by 360 °, the movable contact 530 rotates by 60 °. At this time, a portion connected to the backlash of the gears used for the tap changeover drive member 100, the drive link member 150, the bevel gear member 200, the shaft member 300, and the insulating shift member 400 The movable contact 530 can not be rotated 60 degrees in the first rotation due to the cumulative tolerance of the movable contact 530. [

The contact rotation amount compensating member 605 further includes a contact rotation amount compensating member 605 which can be rotated about 20 ° to the left and right to compensate for a shortage of the rotation amount in the first rotation.

Particularly, the insulating shift member 400 includes a Geneva gear universal joint 410 coupled to the Geneva gear unit 350, an involute spline variable member (not shown) connected to the Geneva gear universal joint 410, And an insulating shaft 450 connected to the involute spline varying member 420 at an end thereof, a first insulating member 430 connected to the insulating shaft to insulate electricity generated in the multi-point connecting module 500, And a connection universal joint 440 connecting the first insulation member 430 and the multi-point connection module 500. [

The insulation operation of the insulation displacement member 400 is performed by the mechanical or mechanical operation of the tap switching drive member 100 by the displacement of the multi-point connection module 500, Is a means for protecting the insulation between the member 100, the driving link member 150, the bevel gear member 200, the shaft member 300, and the tabs of the insulating member 400.

The involute spline variable member 420 interlocks with the Geneva gear universal joint 410 and extends or reduces the length of the involute spline variable member 420 to bridge the multi-point connection module 500.

This is because the transformer is a product made by welding the transformer enclosure when assembling, so that exact dimensions do not come out. In order to adjust the length by using a general workpiece, it is necessary to measure the dimensions on the spot and to perform assembly after machining such as drilling work. However, when the involute spline variable member 420 is used, .

The first insulation member 430 is an insulation member that isolates electricity or electric power generated in the multi-point connection module 500.

The insulating shaft 450 serves as a bridge between the involute spline varying member 420 and the first insulating member 430. The involute spline varying member 420 is a member in which insulation is not efficient, This is because insulation breakdown may occur when the involute spline variable member 420 is directly coupled to the first insulation member.

The connection universal joint 440 finally connects the power transmitted from the Geneva gear portion 350 to the multi-point connection module 500. Here, the Geneva gear universal joint 410 and the connection universal joint 440 are arranged such that the involute spline variable member 420, the first insulation member 430, the insulation shaft 450, It is possible to transmit power even in a state other than a straight line.

This is because the involute spline variable member 420, the first insulating member 430, and the insulating shaft 450 are shaken in all directions due to the vibration generated in the transformer, so that the cumulative tolerance may occur.

More preferably, a second insulating member 460 is further disposed between the insulating shaft 450 and the involute spline varying member 420 to further insulate the voltage transmitted to the insulating shaft 450 .

As described above, it is a basic technical specification to rotate a plurality of rotary joints equally, and this is merely an example, and various modifications and equivalent embodiments can be made by those skilled in the art. It is to be understood that the true scope of protection of the present invention should be determined within the scope of the appended claims.

100: a tap switching drive member
150:
200: Bevel gear member
300: Axial joint member
310: first coupling set
320: second coupling set
330: Axial transfer pipe
340:
350: Geneva gear portion
400: insulated shift member
410: Geneva Gear universal joint
420: Involute spline variable member
430: first insulating member
440: connection universal joint
450: Insulated shaft
460: second insulating member
500: Multi-point connection module
510: Support plate
520: Fixed contact
530: Rotary contact
600: Driving device
605: compensation member
610: Gasket
620: Oil seal
630: Handle

Claims (1)

A transformer including a switching device and a driving device (600) for operating the switching device,
The above-
A tab switching driving member (100);
A driving connection member 150 having one side connected to the tap switching driving member 100 in a pipe shape;
A bevel gear member 200 coupled to the driving connection member 150;
A shaft coupling member 300 composed of a Geneva gear portion 350 and a pipe-shaped shaft transmitting portion 340 and gear-coupled to the bevel gear member 200;
An insulating shaft member 400 coupled to the Geneva gear unit 350;
And a multi-point connection module 500 coupled to the insulation member 400,
Wherein a plurality of the shaft coupling members (300) are continuously connected to form a plurality of the multi-point connection modules (500).

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