KR20160088567A - Zero Load Voltage Retainer For Explosion Transformer - Google Patents

Abstract

The present invention relates to a transformer including a multipoint connection module installed in a switching unit and a driving box to open and close the switching unit. The transformer includes a plurality of multipoint connection modules, each of which includes a support plate, a plurality of fixed contacts arranged at regular intervals on one surface of the support plate in an arc direction, and a movable contact which is rotated at the center of the support plate to come into contact with each of the fixed contacts. The transformer further includes a shaft joint part which is in line with the movable contacts of the multipoint connection modules, thereby simultaneously rotating the movable contacts of the multipoint connection modules. The driving box includes an automatic locking member which is automatically opened and closed, so that the driving box is automatically locked when the power is applied to the transformer and the driving box is automatically unlocked when the power is not applied to the transformer. Thus, an electric contact point of a tap easily moves and resistance is not generated, thereby increasing efficiency. In addition, since a plurality of taps use the same shaft, each operation variation is reduced. In addition, since an electric arc does not occur at the coupling parts of the taps, a failure rate dramatically decreases. In addition, since the driving box has a dustproof, waterproof, and hermetic structure, quality and stabilization of the driving box can be guaranteed.

Description

{Zero Load Voltage Retainer For Explosion Transformer for Explosion-proof Transformer}

The present invention relates to a no-load voltage regulator for an explosion-proof transformer, and relates to a no-load voltage regulator for an explosion-proof transformer in which an electrical connection point of a tab is easily moved and resistance is not generated much.

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.

Such use of a single connection tab as described above is somewhat related to the time required in the coil winding manufacturing process, the content of the material used, and the size of the transformer enclosure depth and has some drawbacks. 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.

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 that keeps the airtightness in the driving chamber, and the operation and safety have been problematic.

Korean Patent Publication No. 10-2009-0096462

SUMMARY OF THE INVENTION It is an object of the present invention to provide a no-load voltage maintainer for an explosion-proof transformer which is manufactured to be rounded so that electrical connection points of the tabs are easily moved and resistance is not generated much.

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

It is another object of the present invention to provide a no-load voltage retainer for an explosion-proof transformer which is manufactured so that an arc is not generated at a portion where a tab is coupled.

Also, it is an object of the present invention to provide a no-load voltage maintainer for an explosion-proof transformer that improves operability and safety by fabricating a drive box with a dustproof and airtight structure.

In addition, when the transformer is in operation so that the tab can not be changed due to a safety problem of a person skilled in the art, an automatic locking device is used to open and close the transformer, and the transformer is automatically unlocked when the power is turned off. Voltage regulator.

In order to achieve the above object, the present invention provides a transformer having a multi-point connection module inside a switching device and having a drive box for opening and closing the switching device, the transformer comprising: a support plate; A plurality of multi-point connection modules each including a fixed contact point formed by a plurality of predetermined intervals and a moving contact point rotated by the center of the support plate and connected to each of the fixed points, Wherein the drive shroud includes an automatic lock member that is opened and closed automatically upon opening and closing to automatically lock the transformer when the transformer is powered on, Is automatically deactivated when the door is closed.

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

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

A plurality of the shafts are horizontally connected to the universal joint, and the universal joint is fastened by the shaft by a bolt that surrounds the outer periphery by the shield cap.

Further, the driving case is characterized in that a waterproof rubber is provided along an edge thereof so that the inside and outside of the driving case are kept airtight.

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.

In addition, dustproof, waterproof, and airtight structures are adopted for driving, thereby ensuring quality and stability.

1 is a sectional view showing a no-load voltage regulator for an explosion-proof transformer according to the present invention;
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an explosion-proof transformer,
3 is a front view showing a no-load voltage retainer for an explosion-proof transformer according to the present invention.
4 is a side view showing a no-load voltage retainer for an explosion-proof transformer according to the present invention;
5 is a side view showing a stationary contact of a no-load voltage retainer for an explosion-proof transformer according to the present invention.

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

FIG. 1 is a cross-sectional view showing a no-load voltage regulator for an explosion-proof transformer according to the present invention, FIG. 2 is a sectional view showing a shaft of a no-load voltage regulator for an explosion-proof transformer according to the present invention, 4 is a side view showing a no-load voltage maintaining device for an explosion-proof transformer according to the present invention, FIG. 5 is a side view showing a fixed contact of a no-load voltage maintaining device for an explosion-proof transformer according to the present invention, Respectively.

As shown in FIGS. 1 to 5, a transformer having a drive box 300 having a multi-point connection module inside a switching device and opening and closing a switching device, includes a support plate 110, And a movable contact connected to each of the fixed contacts 120 by being rotated at the center of the support plate 110. The multi-point connection module 100 includes a plurality of fixed contacts 120, And a shaft coupling portion formed on a straight line with each of the moving contact portions so as to simultaneously rotate the moving contact of the multi-point connection module, The automatic lock member 600 is automatically opened and closed to automatically lock when the power source of the transformer is being applied and to be automatically released when the power source of the transformer is shut off.

Here, the operation principle and structure of the tap of the transformer are introduced in the prior art, and a detailed description thereof will be omitted.

The outer shape of the transformer is largely composed of a switching device and a driving box 300 for opening and closing the switching device. Here, various members for driving the transformer are mounted in the switching device.

Hereinafter, each configuration will be described in detail.

The multi-point connection module 100 according to the present invention includes a support plate 110 and a stationary contact 120 and a rotary contact 130 installed on the support plate 110.

The support plate 110 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 110 are spaced apart from each other by a predetermined distance in the switching device. In the present invention, there are three support plates 110, which may vary depending on the person skilled in the art.

The support plate 110 has a rotary contact 130 rotatable with the stationary contact 120 on one side. The support plate 110 is provided with a shaft 200 to rotate the rotation contact 130 on the other surface.

The stationary contact 120 is fixed to one surface of the support plate 110.

Here, the fixed contacts 120 are spaced apart from a virtual arc of one side of the support plate 110 by a predetermined distance, and the number of the fixed contacts 120 is usually three to seven.

The rotation contact 130 is rotatably installed on one side of the support plate 110. It should be noted that the fixed contact 120 and the rotary contact 130 are equally installed in a plurality of support plates 110.

Here, the rotary contact 130 is installed at the center of a virtual arc of the support plate 110, and is rotated to touch the fixed contact 120 by rotation.

Accordingly, electric power is applied to the fixed contact 120 where the rotary contact 130 is located, so that the variable contact 120 is transformed.

For example, in the case of the stationary contact 120 spaced at a constant interval of 60 °, when the rotary contact 130 is positioned at 60 to 240 °, When the rotary contact 130 is rotated by 120 to 300 °, electric power is applied twice to perform the transforming operation. Here, the first transformer and the second transformer can be variously changed according to the use specification, and various transformations are possible as the number of the fixed contacts 120 increases.

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

The shaft portion 200 according to the present invention is formed on the other surface of the support plate 110 so as to be formed in line with each of the moving contacts so that the moving contact of the multi-point connection module 100 is simultaneously rotated.

In the related art, a plurality of the axis joints 200 are connected to each other and an error is generated in the rotation angle of the rotary contact 130 due to a deviation of connected parts, And the rotation contact 130 is rotated.

The shafts 210 are horizontally connected to the universal joint 220 and the bolts 240 surrounding the outer circumference of the shafts 210 are shielded by the shield cap 230. In this case, (220) is fastened by the shaft (210).

Here, the shaft 210 serving as a shaft is connected to the support plate 110, and each of the shafts 210 is maintained horizontal by the universal joint 220.

The universal joint 220 is coupled to the bolt 240 around which the outer circumference is enclosed by the shield cap 230 that electrically reduces the resistance to be coupled to the shaft 210.

Therefore, since the shaft 210 is coupled with the universal joint 220 while maintaining the horizontal position, the rotary contact 130 is equally rotated without error.

Preferably, the inner circumferential surface of the stationary contact 120 is arc-shaped, and both ends of the movable contact 120 correspond to the inner circumferential surface shape of the stationary contact 120 so that the electrical resistance against rotation is reduced.

This is because the fixed contact 120 is installed at a predetermined interval in the imaginary circular arc of the support plate 110 and the rotary contact 130 is also rotated at the center of the support plate 110, (120) and the rotary contact (130).

Accordingly, when the inner circumferential surface of the fixed contact 120 is formed in a round cheek shape, both ends of the moving contact are formed in a round cheek shape corresponding to the inner circumferential shape of the fixed contact 120 to reduce the electrical resistance against rotation Do.

Preferably, the fixed contact 120 is formed with a coupling groove 122 through which the coupling bolt 124 is coupled with the supporting plate 110, It is preferable that no arc is generated due to collision with the head of the coupling bolt 124 when electricity flows, since the head does not protrude outside the stationary contact point 120.

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 120, a problem arises in that a large amount of arc malfunction occurs due to the collision of various conductor parts. Has come.

In the present invention, an engaging groove 122 corresponding to the thickness of the engaging bolt 124 is inserted into the fixed contact 120, and the engaging bolt 124 is inserted into the engaging groove 122, Is coupled to the support plate 110.

The drive box 300 according to the present invention is provided with an automatic lock member 600 that automatically opens and closes when opened and closed. When the transformer is powered on, it is automatically locked. When the power of the transformer is shut off, . This is because the transformer is ultra-high pressure, which is the biggest safety problem. Therefore, when the transformer is in operation so that the tap can not be changed due to a safety problem of a person skilled in the art, the power source of the transformer is automatically locked through the automatic locking member 600 of the opening and closing door of the driving case 300, And the power is released through the automatic locking member (600).

Preferably, the driving case 300 is provided with a waterproof rubber 310 along an edge thereof, and an inner and outer portions thereof are hermetically held by inserting an O-ring.

This has been a problem in that a part of the driving case 300 is opened, and water or various foreign substances are drawn into the open space into the transformer. Usually, the foreign object was drawn along the edge of the driving box 300 most.

Therefore, it is effective to use the transformer for a long time by installing the waterproof rubber 310 along the edge of the drive case 300 and inserting an O-ring into the inside to maintain airtightness.

As described above, it is a basic technical idea to rotate a plurality of rotary joints in the same manner, and this is merely an example, and those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. 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: Multi-point connection module
110: Support plate
122: Coupling groove
124: coupling bolt
120: Fixed contact
130: Rotary contact
200: Axis
210: The shaft
220: universal joint
230: Shield cap
240: Bolt
300: Powered
310: Waterproof rubber

Claims (1)

A no-load voltage maintaining device for an explosion-proof transformer, comprising a drive box (300) having a multi-point connection module inside a switching device and opening and closing a switching device,
A plurality of fixed contacts 120 formed at a predetermined interval in the circumferential direction on one surface of the support plate 110 and a plurality of fixed contacts 120 connected to each of the fixed contacts 120 by being rotated from the center of the support plate 110, A plurality of multi-point connection modules 100 are provided,
And a shaft joint (200) formed on a straight line with each of the movable contacts to simultaneously rotate the movable contact of the multi-point connection module (100)
The drive case 300 is provided with an automatic lock member 600 that is automatically opened and closed when the transformer is open or closed. When the transformer is powered on, the drive case 300 is automatically locked. When the transformer is powered off, Wherein the voltage is applied to the transformer.

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