[DESCRIPTION] [Invention Title]

AUTOMATIC HIGH VOLTAGE REGULATOR [Technical Field]

The present invention relates to an automatic high voltage regulator in that the voltage drop is compensated at a voluntary time interval against a voltage drop of a distribution line corresponding to the first of the electrical consumer, whereby providing a rated voltage with the high voltage transformer. [Background Art]

Generally, in the high voltage transformer, the dropped voltage is supplied to the first of the transformer and the second voltage is outputted below the desired rated voltage on account of a main cause of a power transmission loss and so on. In order to improve the defect, it furnishes a NLTC (No Load Tap changer) capable of adjusting a tap in a state that there is no load that is, the power is off, so as to raise and fall the first voltage in a rated voltage.

However, in the transformer using the NLTC, since it needs to shut off the power for adjusting the tap thereof, it cannot be actually applicable and is limited to the installation of the transformer or the maintenance and repair.

Unlike the NLTC, an OLTC (On Load Tap Changer) can manually or automatically adjust the tap in a state that there is a load. However, because the OLTC is a complicated structure, a high price and a big size in comparison with the conventional NLTC, it is mainly used in a power transformer(or power transmission). However, in the power transmission line using the OLTC, the voltage drop thereof is very small in comparison with the distribution line, so that the switching of the tap is not frequently. Also, since the voltage difference between the taps is about 500V through 3.3kV, the voltage drop is not generated in a power plant or a transformer substation and so on except for an urgent crisis situation.

In consequence, in case of the OLTC, the tap is manually or automatically switched against the voltage drop of the first in a state that there is a load so as to maintain the safe of the power transmission line. However, the excessive circulating currents are generated during the switch of the tap, so that the enormous electrical shock can be applied to the transformer and the electronic equipment mounted at the rear thereof.

Unlike the OLTC, in a voltage adjusting transformer for compensating the voltage drop of the distribution line of four lines type of the power supplier, the circulating currents is high, so that it is developed for only singe-phase.

However, the voltage-adjusting transformer is furnished to the distribution line of the power supplier, not the distribution line of the electrical consumer, which consumes the final power. Therefore, there are defects in that the efficiency of the voltage adjustment is very low and the establishment cost is very high because three goods of a high price is constituted for three phases.

In consequence, the voltage-adjusting transformer serves to stabilize the distribution line of the power supplier. Accordingly, it is not help to adjust the power quality (voltage) of the electrical consumer, which consumes the final power. Here, it is desirable to adjust the voltage drop of the distribution line caused by the distribution line of a long range as in the remote place or the back land. However, there is a restriction in use in that it must be formed in a place free from load. [Disclosure] [Technical Problem]

Accordingly, the present invention has been made to solve the above- mentioned problems occurring in the prior art, and an object of the present invention is to provide an automatic high voltage regulator capable of constantly furnishing a suitable rated voltage to a transformer according to the change of the applied high-voltage. [Technical Solution]

To accomplish the objects, the present invention provides an automatic high voltage regulator comprising an external case; a transformer fixed to and insulated from an inside of the external case by means of a supporting member and having a plurality of taps drawn by each phase; a base frame having a base plate and first and second insulating pillar plates attached on both ends of an upper surface of the base plate respectively; a tap plate member comprising an insulating support plate having lower portions of both ends thereof coupled to upper surfaces of the first and second insulating pillar plates and a plurality of tap terminals separately formed along a lengthwise direction of the insulating support plate in such a manner that upper and lower portions thereof are exposed to outside; a switching member selectively switched between a first location electrically connected to N and N+l tap terminals and a second location electrically connected to the N and N+l tap terminals and a N+2 tap terminal in a moment and then, electrically connected to the N+l and N+2 tap terminals; a moving means for placing the switching member thereon to be insulated and formed at the base frame; PT circuits electrically connected by each phase of the transformer; a high- voltage regulator comprising a plurality of sensors electrically connected to the PT circuits respectively in order to sense each electrical signal, a control means having a controller for controlling the moving means in such a manner that the switching member is selectively switched according to the sensing value of the sensors, wherein the high-voltage regulator is built in the external case and the taps drawn by each phase are electrically connected to corresponding tap terminals; and a bushing member electrically connected to the transformer by each phase and formed at an outside of the external case.

Preferably, the tap plate member further comprises an insulating guide block for encapsulating lower portions of the tap terminals exposed to the lower surface of the insulating support plate and contacting portions of the tap terminals electrically connected to the switching member are exposed through the insulating guide block.

Preferably, the moving means comprises a ball screw member having both end portions rotational Iy supported to the first and second insulating pillar plates and one end portion thereof exposed to an outside of the first insulating pillar plate, an insulating moving means mechanically connected to the ball screw member and interposed between the first and second insulating pillar plates, and a driving member interlocked with one end portion of the ball screw.

Preferably, the moving means further comprises a power supplier for supplying a power to the driving member.

Preferably, a material of the external case is a synthetic resin based polymer.

To accomplish the objects, the present invention provides an automatic high voltage regulator comprising an external case; an autotransformer fixed to and insulated from an inside of the external case by means of a supporting member and having a plurality of taps drawn by each phase; a base frame having a base plate and first and second insulating pillar plates attached on both ends of an upper surface of the base plate respectively; a tap plate member comprising an insulating support plate having lower portions of both ends thereof coupled to upper surfaces of the first and second insulating pillar plates and a plurality of tap terminals separately formed along a lengthwise direction of the insulating support plate in such a manner that upper and lower portions thereof are exposed to outside; a switching member selectively switched between a first location electrically connected to a N tap terminal and a second location electrically connected to the N tap terminal and a N+l tap terminal in a moment and then, electrically connected to the N+l tap terminal; a common tap terminal electrically connected to the switching member and fixed across the first and second insulating pillar plates; a moving means for placing the switching member thereon to be insulated and formed at the base frame; PT circuits electrically connected by each phase of the transformer; a high-voltage regulator comprising a plurality of sensors electrically connected to the PT

circuits respectively in order to sense each electrical signal, a control means having a controller for controlling the moving means in such a manner that the switching member is selectively switched according to the sensing value of the sensors, wherein the high-voltage regulator is built in the external case and the taps drawn by each phase are electrically connected to corresponding tap terminals,' and a bushing member electrically connected to the transformer by each phase and formed at an outside of the external case.

[Advantageous Effects]

In the automatic high voltage regulator, there are effects in that its construction is simple, the maintenance and repair is easy, and a short surge and a circulating current are not generated during the opening and closing of the high-voltage circuit.

Also, there is another effect in that the high-voltage of the distributed line is maintained in a constant voltage, whereby utilizing a low-voltage power and implementing the optimum surroundings in use of the electronic equipment. [Description of Drawings]

The above as well as the other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic sectional view illustrating an automatic high voltage regulator according to one embodiment of the present invention,"

FIG. 2 is an enlarged perspective view illustrating the high-voltage regulator of FIG. 1;

FIG.3 is a partial enlarged perspective view of FIG. 2;

FIG.4 is a cross sectional view taken along line 4-4 of FIG.3;

FIG. 5 is a cross sectional view taken along line 5-5 of FIG.3;

FIG. 6 illustrates a connecting relation between a control means and a driving means schematically!

FIG. 7 is a flow chart illustrating an operation of the control means;

FIG. 8 through FIG. 11 are schematic plan views illustrating operation conditions of the high-voltage regulator according to the present invention;

FIG. 12 is a schematic sectional view illustrating an automatic high voltage regulator according to second embodiment of the present invention;

FIG. 13 is an enlarged perspective view illustrating the high-voltage regulator of FIG. 12;

FIG. 14 is a partial enlarged perspective view of FIG. 13;

FIG. 15 is a cross sectional view taken along line 15-15 of FIG. 14;

FIG. 16 is a cross sectional view taken along line 16-16 of FIG. 14;

FIG. 17 illustrates a connecting relation between a control means and a driving means schematically according to the second embodiment of the present invention;

FIG. 18 is a flow chart illustrating an operation of the control means according to the second embodiment of the present invention; and

FIG. 19 through FIG. 22 are schematic plan views illustrating operation conditions of the high-voltage regulator according to the second embodiment of the present invention. [Best Mode]

A preferred embodiment of the invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic sectional view illustrating an automatic high voltage regulator according to one embodiment of the present invention.

Referring to FIG. 1, the automatic high voltage regulator 200 according to one embodiment of the present invention includes an external case 110, a transformer 130 having a core and first and second coils of three phase (U, V and W) mounted on the core, a supporting member 150 for supporting the transformer 130 to the external case 110, a high-voltage regulator 100 formed at the upper portion of the transformer 130 in order to adjust a desired second rated voltage corresponding to a voltage supplied to the first coil.

Here, in the automatic high voltage regulator 200 according to one embodiment of the present invention, the transformer 130 has an oil-filled type structure and the high-voltage regulator 100 is submerged by an electrical insulating oil. However, the present invention is not limited to any structure of the transformer and can be applied to a mold transformer or a gas insulated transformer and so on. When the mold transformer is utilized, the high-voltage regulator 100 is separately built in the external case, whereby it is insulated by the insulating oil or a gas filling manner like the gas insulated transformer.

The external case 110 according to the present invention includes a

body 112 of a predetermined volume having an upper portion open to outside and a cover 114 coupled to the upper portion of the body 112. Here, the external case 110 of a synthetic resin based polymer does not have a heat sink, while the general high voltage transformer has the external case of a metal material using a spontaneous cooling manner and the heat sink communicated with the external case.

As though the external case 110 of a synthetic resin based polymer according to the present invention does not have the heat sink, since the occurrence of a heat generated from the transformer 130 is remarkably low in comparison with the general high voltage transformer, it is unnecessary to form the heat sink. Also, because the polymer external case 110 is a perfect insulator, an electric shock accident of a user or equipment can be fundamentally prevented. Also, the design of the polymer external case 110 is small and light, so that it is easy to be mounted on the interior of room or the underground.

Also, in the automatic high voltage regulator 200 according to one embodiment of the present invention, the external case 110 is made of the synthetic resin based polymer. However, the present invention is not limited to any material of the external case and can be applied to a general steel external case having the heat sink.

The transformer 130 has a two winding structure of three phases, in which the first and second coils are winded, and includes a plurality of taps 131, 133 and 135 drawn from the first coil.

The supporting member 150 includes top and bottom insulating plates 151 and 153 and a fixing bolt 155. Here, the capacity, size, and property of the transformer 130 may be changed according to the oil-filled type, the mold type or a gas insulating type and so on.

Also, the transformer 130 is interposed between the top and bottom insulating plates 151 and 153 and the upper end portion of the fixing bolt 155 for connecting the top and bottom insulating plates 151 and 153 is attached to the lower surface of the cover 114 of the external case 110.

Moreover, the lower portion of the bottom insulating plate 153 is supported to the floor of the inside of the body 112 of the external case 110.

A high-voltage bushing 170 is formed at the side of the body 112 of the external case 110. However, the present invention is not limited to any structure of the high-voltage bushing 170 and can be applied to a general structure in that high-voltage bushing is penetrated through the cover 114 and protruded toward the upper side portion thereof. Here, the high-voltage bushing 170 has three pieces of a first high-voltage bushing and three pieces of a second high-voltage bushing according to the two winding structure of three phases. However, in FIG. 1, only three bushings are shown in a dashed line for descriptive convenience sake. Also, the high-voltage bushing 170 is electrically connected to the corresponding first and second coils. However, since the electrically connecting structure is the same as that of the general transformer, further description is omitted here.

The high-voltage regulator 100 is mounted on the upper portion of the top insulating plate 151 and electrically connected to the plurality of taps 131, 133 and 135 drawn from the transformer 130. Also, in the high-voltage regulator 100, the first and second coils of each phase are provided with PT circuits PTi (20-1), PT ₂ (20-2) and PT ₃ (20-3).

FIG. 2 is an enlarged perspective view illustrating the high-voltage regulator of FIG. 1, FIG. 3 is a partial enlarged perspective view of FIG. 2, FIG. 4 is a cross sectional view taken along line 4-4 of FIG. 3 and FIG. 5 is a cross sectional view taken along line 5-5 of FIG. 3.

Referring to FIG. 2 through FIG. 5, the high-voltage regulator 100 according to the present invention includes a base frame 10, a plurality of tap plate members 40-1, 40-2 and 40-3 mounted on the base frame 10 and having a plurality of tap terminals 44-1, 44-2 and 44-3 separated from each other, switching members 50-1, 50-2 and 50-3 selectively and electrically connected to the tap terminals 44, moving means 30-1, 30-2 and 30-3 for placing the switching members 50-1, 50-2 and 50-3 thereon and formed at the base

frame 10, and a control means 80 for driving and stopping the moving means 30-1, 30-2 and 30-3 in order to selectively and electrically connect the switching members 50-1, 50-2 and 50-3 to the tap terminals 44-1, 44-2 and 44- 3.

The base frame 10 includes a base plate 12 and first and second insulating pillar plates 14 and 16 attached on both ends of the upper surface of the base plate 12 respectively.

The material of the base plate 12 may be metal or non-metal. Preferably, it is made of synthetic resin based insulating material having good high breakdown voltage properties.

The high-voltage regulator 100 according to the present invention is directly loaded up the base frame 10, so that it has superior hardens and strength as well as a thickness of approximately 15mm through 30mm in order to maintain a desirable flatness.

The first and second insulating pillar plates 14 and 16 are screw- coupled to the upper surface of the base plate 12 so as to be easily attached and deattached. However, since its construction is not important in the present invention, the illustration is omitted here.

Preferably, the base frame 10 is assembled by the plural parts 12, 14 and 16. More preferably, the base frame 10 is integrally manufactured. Here, where the base frame 10 is integrally manufactured, it is necessary to use insulating material .

The upper and side surfaces of the base frame 10 are opened to outside. However, it is most preferably that all the high-voltage regulator 100 is closed except for the tap terminals 44-1, 44-2 and 44-3 of the tap plate members 40-1, 40-2 and 40-3, in order to fundamentally solve a short or many other insulating problems.

In the high-voltage regulator 100 according to the present invention, since the tap plate members 40-1, 40-2 and 40-3, the moving means3Q-l, 30-2 and 30-3 and the switching members 50-1, 50-2 and 50-3 have same structures respectively, it will be described around the structure of "U" phase among

three phases herein below.

The tap plate member 40-1 includes an insulating support plate 42-1 having lower portions of both ends thereof coupled to upper surfaces of the first and second insulating pillar plates 14 and 16 by means of coupling members 46-1 and the plurality of tap terminals 44-1 formed along the lengthwise direction of the insulating support plate 42-1 in such a manner that the upper and lower portions are exposed to outside.

Preferably, the material of the insulating supporting plate 42-1 has a superior insulating property and small thermal expansion and contraction. Here, the coupling member 46-1 includes a hexagonal wrench bolt 46al and a washer 46bl. The hexagonal wrench bolts 46al are penetrated through two through holes (not shown) formed at both end portions of the insulating supporting plate 42-1 and are penetrated through and coupled to screw- coupling holes (not shown) of the first and second insulating pillar plates 14 and 16.

Preferably, the material of the tap terminal 44-1 is a metal having a superior conductivity. Also, in the drawing, the shape of the tap terminal 44-1 is a cylinder. However, the present invention is not limited to any shape of the tap terminal 44-1 and the lower side surface thereof contacted with the switching member 50-1 may be in the shape of a rectangular. Here, the cross-sectional area of the tap terminal 44-1 relates to the electrical capacity in a case of applying to the transformer or the circuit breaker.

Also, the upper side portion of the tap terminal 44-1 is mechanically and electrically connected to the tap drawn from the first coil of any phase corresponding to the transformer 130 respectively.

Moreover, the tap terminals 44-1 are formed along the lengthwise direction of the insulating support plate 42-1 in a predetermined distance. More concretely, each tap terminal 44-1 is downwardly and forcibly fitted and inserted into through holes (not shown), which are formed along the lengthwise direction of the insulating support plate.

As described above, it is preferable that the material of the tap

terminal 44-1 is a metal. However, in the tap terminal 44-1 of a metal material, the contacting portion thereof contacted with the switching member can be minutely damaged on account of the spark discharge during the switching of the switching member 50-1 and the electrical shock is concentrated on the damaged portion, thereby it cannot implement a desirable switching. Accordingly, it is desirable to select any material having a superior resistance against the spark discharge and superior electrical and mechanical properties. Here, the switching member 50-1 is also, equally applied as stated above.

The tap terminal 44-1 and the switching member 50-1 according to the present invention are made of a carbon having the following properties.

1. Specific Gravity: 1.80 to 1.85

2. Specific Resistance: 11.0 to 15.5 μ ωm

3. Flexural Strength: 670 to 900 kgf/cπf

4. Shore Hardness: 72 to 80

5. Average Grain Size: 2 to 4 μm

Also, the contacting portion between the tap terminal 44-1 and the switching member 50-1 is polished by a fabric of a very soft material, so that its surface roughness becomes very good in order to decrease the size and number of the spark discharge described above.

The tap plate member 40-1 further includes an insulating guide block 45-1 for encapsulating the tap terminals 44-1 exposed to the lower surface of the insulating support plate 42-1 by means of an insulating material.

Here, preferably, the material of the insulating guide block 45-1 is synthetic resin based insulating material having a good electrical insulating property, so as to insulate the tap terminals 44-1 and the switching member 50-1 as well as minimize the mechanical shock, which can be generated in course of the switching of the tap terminals 44-1 during the high-speed motion of the switching member 50-1.

Accordingly, the lower portions of the tap terminal 44-1 are perfectly encapsulated by the insulating guide block 45-1 and then, the contacting

portion of the each tap terminal 44-1 contacted with the switching member 50- 1 is treated by a roughing process, a minute grinding process of several times and a polishing process in order to expose it.

The moving means 30-1 includes an insulating moving means 32-1 having the switching member 50-1 thereon, a ball screw member 34-1 rotational Iy supported to both end portions of the first and second insulating pillar plates 14 and 16 and interlocked with the insulating moving means 32-1, and a driving member 35-1 interlocked with a connecting end portion 34al of the ball screw 34-1.

The insulating moving means 32-1 is interposed between the first and second insulating pillar plates 14 and 16 and formed at the lower portion of the insulating support plate 42-1. The switching member 50-1 is mounted at the cutting portion (denoted by no reference numeral) of the upper portion of the insulating moving means 32-1.

The ball screw member 34-1 is rotational Iy supported to both end portion of the first and second insulating pillar plates 14 and 16 by means of a bearing or a bushing (not shown). The ball screw member 34-1 includes a screw 34a-l, in that the connecting end portion 34al is penetrated and extend through the first insulating pillar plate 14, and a nut 34b~l interlocked with the screw 34a-l and forcibly inserted into a through hole (denoted by no reference numeral), which is formed at the center portion of the insulating moving means 32-1.

The nut 3bl-l includes a nut casing 34bl-l and a plurality of ball bearings 34bl-2 inserted into a recess (denoted by no reference numeral) formed at the inner peripheral of the nut casing 34bl ^~ l in order to be separated.

Accordingly, the screw 34a-l is coupled to the nut 34b-l. More concretely, the groove portion of the screw 34a~l is rotated along the ball bearings 34b1-2 of the nut 34b-1 at a high speed.

The connecting end portion 34al processing the outer-diameter of the screw 34a-l is penetrated and extend through the first insulating pillar

plate 14 and one end portion thereof is coupled to the driving member 35-1 by means of a coupling 33-1.

The driving member 35-1 for rotating the ball screw member 34-1 may be a general motor or a cylinder for a linear motion. However, the present invention uses a servomotor. The driving member 35-1 is minutely controlled by the control means 80 and the ball screw member 34-1 interlocked with the driving member 35-1 is rotated at a high speed, so that the insulating moving means 32-1 can be minutely moved to a desirous location.

Preferably, the screw 34a-l includes a lead in such a manner that the switching member 50-1 can be moved in a same distance as the interval of the tap terminals 44-1 with respect to one revolution of the driving member 35-1.

Also, in the insulating moving means 32-1, in order to prevent the eccentricity, first and second guide members 36-1 and 38-1 are penetrated through both end portions thereof separated by the ball screw member 34-1 and supported to the first and second insulating pillar plates 14 and 16.

Here, the first and second guide member 36-1 and 38-1 are a grinding pole having a superior outer surface roughness. The corresponding coupling bolts 36a-l and 38a-l are coupled to the screw-coupling groove (not shown) of both end portion the guide members 36-1 and 38-1, respectively.

In the drawings, the first and second guide member 36-1 and 38-1 are simply inserted into the insulating moving means 32-1. It can use any nut identical or similar to the ball screw member 34-1 in order to prevent the eccentricity thereof.

The switching member 50-1 is just as "U" shape and the opposed inner side walls of upper portion thereof are contacted and electrically connected to the peripheral of the tap terminals 44-1. Also, the switching member 50-1 is guided along the insulating guide block 45-1 treated by a roughing process, a grinding process and a polishing process to be move right and left. Here, the switching member 50-1 is selectively and electrically connected to the tap terminals 44-1.

The tap plate member 40-1 according to the present invention is

LD

provided with seventeen tap terminals 44-1 of Nl through N17. Where the ball screw member 34-1 is stopped, the switching member 50-1 is necessarily connected to two tap terminals 44-1 adjacent to each other.

The control means 80 includes a controller 82 for driving and releasing the driving member 35-1. Here, the controller 82 may be a driver, a control box, a PLC (Programmable Logic controller) or its equivalents in order to control the driving member 35-1, which is a servomotor. Also, the controller 82 operates the driving member 35-1 by means of the loaded program.

A sensor 84-1 as an AC voltmeter has relay contacts including a Hi- contact, a Go-contact and a Lo-contact. Accordingly, the controller 82 serves to rotate in a positive or reverse direction or stop the driving member 35-1 according to the contact signals of the sensor 84-1.

Here, the sensor 84-1 is electrically connected to the PT circuit 20-1 to measure the high-voltage, so that the corresponding contacts are outputted respectively. Here, in a case that the Go-contact is outputted, since the measured value is in the range of the deviation of the reference voltage value, the driving of the driving member 35-1 is stopped.

Also, in a case that the Hi-contact is outputted, since the measured value exceeds the deviation range of the reference voltage value, the driving of the driving member 35-1 is reversely rotated and the tap terminal 44-1 is moved in the low number direction (Nl). Moreover, in a case that the Lo- contact is outputted, since the measured value is less than the deviation range of the reference voltage value, the driving of the driving member 35-1 is positively rotated and the tap terminal 44-1 is moved in the high number direction (N17) .

Here, the positive and reverse directions of the driving member 35-1 are determined by the program of the controller 82.

The reference numeral 31 denotes a power supplier for supplying a power to the driving member by means of the control means 80.

In the controller 82 according to the present invention, the contact signals are received from the three sensors 84-1, 84-2 and 84-3 at the same

time, so that the driving members 35-1, 35-2, 35-3 corresponding to each signal is operated or stopped. However, in the present invention, three controllers 82 may be operated independently.

FIG. 6 illustrates a connecting relation between the control means and the driving means schematically.

Referring to FIG. 6, the sensors 84-1, 84-2 and 84-3 are electrically connected to the PT circuits 20-1, 20-2 and 20-3 respectively. Here, in order to measure the high-voltage, the PT circuits 20-1, 20-2 and 20-3 are provided to the first coil or the second coil.

Each of the sensors 84-1, 84-2 and 84-3 serves to compare the measure values received from the PT circuits 20-1, 20-2 and 20-3 with the reference voltage value and output the relay contacts ( "Hi' , "Go" and "Lo" ). Here, the reference voltage value can be set in a different way by a nation or a user. For example, in Korea, the reference voltage value can be set to 220V or 380V.

For example, in the PT circuits 20-1, 20-2 and 20-3, where the rated voltage of 22,900V is applied to the first coil, the voltage of 220V is measured. Here, the reference voltage value is "220±0.5V.

The controller 82 of the present invention receives the relay contacts (the "Hi" contact and "Lo" contact) from the sensors 84-1, 84-2 and 84-3 to rotate in a positive or reverse direction or stop the driving members 35- 1, 35-2 and 35-3.

The power supplier 31 includes a SMPS (Switching Mode Power Supply) 31a and an UPS (Uninterrupted Power Supply) 31b. In the meantime, when it is normally operated, the power is received from any one PT circuit, for example, the PT circuit 20-3 of a W phase. Accordingly, the driving source of the controller 82 and the driving member 35-1, 35-2 and 35-3 is the power supplier 31 while that of the sensors 84-1, 84-2 and 84-3 is the PT circuits 20-1, 20-2 and 20-3 respectively.

FIG. 7 is a flow chart illustrating an operation of the control means and FIG. 8 through FIG. 11 are schematic plan views illustrating operation

conditions of the high-voltage regulator according to the present invention.

Referring to FIG. 7 through FIG. 11, the operation order of the control means 80 according to the present invention will be explained by stages.

The tap terminal 44-1 according to the present is provided with seventeenth pieces of Nl through N17 by each phase. Actually, the number of the tap terminal 44-1 is 30 pieces in principle. However, for the convenience of illustration, only the seventeenth pieces of Nl through N17 are shown in the drawings.

Also, the elements, which are not shown in FIG. 7, refer to FIG. 2 through FIG.6.

1. Power Supply SIlO

When a power is applied to the first coil, the SMPS 31a of the power supplier 31 electrically connected to the PT circuit 20-3 is operated.

2. Origin Return S120

As shown in FIG. 8, the controller 82 received the power from the SMPS 31a allows the driving members 35-1, 35-2 and 35-3 of three phases to rotate in a reverse direction, so that the switching members 50-1, 50-2 and 50-3 are electrically connected to the corresponding tap terminals 44-1, 44-2 and 44-3 of the N2/N1 time respectively.

Here, the origin return is to electrically connect the switching members 50-1, 50-2 and 50-3 to the corresponding terminals 44-1, 44-2 and 44- 3 of the N2/N1 time respectively.

Accordingly, when the power is applied, the origin return is the first operation.

3. Contact Judgment S130 and Motor Driving S142 and S144

As shown in FIG. 6, the sensor 84-1, 84-2 and 84-3 and the controller 82 of the control means 80 according to the present invention are connected to each other by means of a "Hi" signal line and a "Lo" signal line respectively, so that the controller 82 receives only the "Hi" relay

contact signal and "Lo" relay contact signal. That is, the controller 82 has no effect on the "Go" relay contact signal.

The controller 82 judges whether the contact is "Lo" or not.

If the contact signal is "Lo" relay contact, the driving members 35- 1, 35-2 and 35-3 are made one revolution in a positive direction. If not, the driving members 35-1, 35-2 and 35-3 are made one revolution in a reverse direction.

Continuously, where the driving of driving members 35-1, 35-2 and 35-3 is completed, the contact judgment S130 and the motor driving S142 and S144 are repeatedly performed, except that the power is off or the mode is manually switched.

FIG. 9 illustrates the performance result of plural routines next to the origin return. Here, as shown in FIG. 10, in a state of transmitting each of the "Hi" , "GO" and "Lo" contacts of there phases ( "U" , "V" and "W" ) to each controller 82, the driving members 35-1, 35-2 and 35-3 are in course of rotation in a positive or a reverse direction. Especially, since the "V" phase corresponds to the "Go" contact, the corresponding driving member 35-2 is not operated.

As shown in FIG. 10, in the course of tap-switching, the switching member 50-2 of the "V" phase is electrically connected to the adjacent two tap terminals 44-2 and the switching members 50-1 and 50-3 are electrically connected to the adjacent three tap terminals 44-1 and 44-3.

Referring to FIG. 9 through FIG. 11, the correlation between the switching members 50-1, 50-2 and 50-3 and the corresponding tap terminals 44- 1, 44-2 and 44-3 will be described in order herein below.

First Stop Status (FIG. 9)

(1) The sensor 84-1, 84-2 and 84-3 of the control means 80 As a result of the voltage measurement on each phase ( "U" , "V" and "W" ), the measured value is in the range of the deviation of the reference voltage value, thereby outputting the "Go" signal.

(2) The controller 82 of the control means 80

The driving members 35-1, 35-2 and 35-3 are stopped, so that the switching members 50-1, 50-2 and 50-3 are electrically connected to the N9/N8, N6/N5 and N10/N9 tap terminals 44-1, 44-2 and 44-3.

Switching Process (FIG. 10) and Final Stop Status (FIG. 11)

(3) The sensor 84-1, 84-2 and 84-3 of the control means 80

The sensor 84-1 of the "U" : as a result of the voltage measurement, the measured value exceeds the deviation range of the reference voltage value, thereby outputting the "Hi" signal.

The sensor 84-2 of the "V" : as a result of the voltage measurement, the measured value is in the range of the deviation of the reference voltage value, thereby outputting the "Go" signal.

The sensor 84-3 of the "W" : as a result of the voltage measurement, the measured value is less than the deviation of the reference voltage value, thereby outputting the "Lo" signal.

(4) The controller 82 of the control means 80

The controller 82 allows each driving member 35 to rotate in a positive or reverse direction or stop according to the received signals.

The driving member 35-1 of the "U" phase is rotated in a reverse direction and the switching member 50-1 is moved in the low number direction (Nl). At this time, the switching member 50-1 is firstly electrically connected to N9 and N8 tap terminals 44-1 and then, is electrically connected to N9, N8 and N7 tap terminals 44-1 in a moment. Thereafter, the switching member 50-1 is electrically connected to N8 and N7 tap terminals 44-1.

As a result of the repetition in turn as described above, the switching member 50-1 is electrically connected to N5 and N4 tap terminals 44-1 and, then stopped in the end.

Here, in the sensor 84-1, "Go" relay contact is outputted.

The driving member 35-2 of the "V" phase is continuously stopped, so that it maintains a status in that the switching member 50-2 is firstly

connected to N6 and N5 tap terminals 44-2.

The driving member 35-3 of the "W" phase is rotated in a positive direction and the switching member 50-3 is moved in the high number direction (N17). At this time, the switching member 50-3 is firstly electrically connected to NlO and N9 tap terminals 44-3 and then, is electrically connected to Nil, NlO and N9 tap terminals 44-3 in a moment. Thereafter, the switching member 50-3 is electrically connected to Nil and NlO tap terminals 44-3.

Here, in the sensor 84-3, "Go" relay contact is outputted.

In the high-voltage regulator 100 according to the present invention, where the switching members 50-1, 50-2 and 50-3 are stopped, the switching members 50-1, 50-2 and 50-3 are necessarily connected to the adjacent two tap terminals 44-1, 44-2 and 44-3. In the course of switching, the switching members 50-1, 50-2 and 50-3 are electrically connected to the adjacent three tap terminals 44-1, 44-2 and 44-3 in a moment and then, is electrically connected to the adjacent two tap terminals 44-1, 44-2 and 44-3 immediately.

In the drawings, the tap terminal 44-1 according to the present is provided with seventeenth pieces of Nl through N17 by each phase. However, in order to implement a best embodiment, the number of the tap terminal 44-1 is 30 to 50 pieces in principle. That is, for the convenience of illustration, only the seventeenth pieces of Nl through N17 are shown in the drawings.

It will be briefly described as an example, on the assumption that the first and second rated voltages are 22,900V equally and the voltage difference between 30 pieces of the tap terminals is 50V.

Here, the range of the voltage switched by the high-voltage regulator is 21,600 through 23,000V.

Table 1

Here, the origin return of the switching member is a N30/N29 tap terminal .

If the first rated voltage 22,900V is applied, the switching member is contacted and electrically connected to a N28/N27 tap terminal, next to the origin return.

Here, the first voltage of Table 1 is a tap drawn from the first coil of each of the corresponding phases by a difference of 50V and means the voltage of the coil generated when the rated voltage 22,900V is supplied to the first coil .

Accordingly, the second output voltage is maintained within 22,900V± 50.

In a case that the automatic high voltage regulator according to the present invention is mounted on the previous portion of the high voltage transformer, the desirous rated voltage 22,900V is outputted to the second portion of the high voltage transformer in a real time or by a voluntary adjusting time unit against a voltage drop of a distribution line, thereby 220V, 380V, 440V and so on, which are actually used in the high voltage transformer, can be maintained in a constant voltage.

A general AVR for low-pressure is designed under about lOOkVA capacity and is applied to a low current. However, since it cannot be applied to electric and power appliances using a high power or a high current in a general industrial equipment or a factory, there is a severe restriction for use.

However, in the automatic high voltage regulator according to the present invention, the capacity thereof is decided depending on the capacity of the high voltage transformer. As described above, there is a merit in that the high voltage of 22,900V can be maintained in a constant voltage in the raged of 0.5%.

Also, in the automatic high voltage regulator according to the present invention, the rated voltage can be differently changed according to each nation, use office and electrical consumer. Accordingly, if only the transformer is changed, the number of the tap terminal and the voltage difference between the tap terminals may be changed without limit according to the demand of the user.

Moreover, in the automatic high voltage regulator according to the present invention, the first and second voltages are high altogether. However, the present invention is not limited to any kind of the voltage. For example, it is possible to constitute a general transformer for a decompression, in which the first and second voltages are high and low voltages respectively.

FIG. 12 is a schematic sectional view illustrating an automatic high voltage regulator according to second embodiment of the present invention.

Referring to FIG. 12, the automatic high voltage regulator 400 according to second embodiment of the present invention includes an external case 410, a transformer 330 having a core and first coil of three phase (U, V and W) mounted on the core, a supporting member 350 for supporting the transformer 330 to the external case 410, a high-voltage regulator 300 formed at the upper portion of the transformer 330 in order to adjust a desired second rated voltage corresponding to a voltage supplied to the first coil.

Since the automatic high voltage regulator 400 of FIG. 12 is the same as that of FIG. 1 except for an autotransformer of the second embodiment of the present invention, further descriptions are is omitted here.

In the high-voltage regulator 300, the first coil of each phase is provided with PT circuits PT ₁ (220-1), PT ₂ (220-2) and PT ₃ (220-3).

FIG. 13 is an enlarged perspective view illustrating the high-voltage regulator of FIG. 12, FIG. 14 is a partial enlarged perspective view of FIG. 13, FIG. 15 is a cross sectional view taken along line 15-15 of FIG. 14 and FIG. 16 is a cross sectional view taken along line 16-16 of FIG. 14.

Referring to FIG. 13 through FIG. 16, the high-voltage regulator 300 according to the present invention includes a base frame 210, a plurality of tap plate members 240-1, 240-2 and 240-3 mounted on the base frame 210 and having a plurality of tap terminals 244-1, 244-2 and 244-3 separated from each other, switching members 250-1, 250-2 and 250-3 selectively and electrically connected to the tap terminals 244, moving means 230-1, 230-2 and 230-3 for placing the switching members 250-1, 250-2 and 250-3 thereon formed at the base frame 210, and a control means 280 for driving and stopping the moving means 230-1, 230-2 and 230-3 in order to selectively and electrically connect the switching members 250-1, 250-2 and 250-3 to the tap terminals 244-1, 244-2 and 244-3.

Since the construction of the high-voltage regulator 300 of FIG. 13 is the same as that of FIG. 2 except that one tap terminal among common tap

terminals 260-1, 260-2 and 260-3 according to the second embodiment of the present invention is always electrically connected to the corresponding switching members 250-1, 250-2 and 250-3 respectively, further descriptions are is omitted here.

In the high-voltage regulator 300 according to the present invention, since the tap plate members 240-1. 240-2 and 240-3. the moving means 230-1, 230-2 and 230-3 and the switching members 250-1. 250-2 and 250-3 have same structures respectively, it will be described around the structure of Ij- phase among three phases herein below.

The common tap terminal 260-1 is always electrically connected to the switching member 250-1 and includes both end portions fixed to the first and second insulating pillar plates 14 and 16 respectively. Here, the common tap terminal 260-1 is contacted with one side surface of the switching member 250-1 opposed to another side surface of the switching member 250-1 contacted with the tap terminal 244-1.

In order to electrically connect the common tap terminal 260-1 to the switching member 250-1 at all times, the common tap terminal 260-1 is penetrated through the insulating moving means 232-1 and surface-contacted with the switching member 250-1 to be electrically connected.

Commonly, the shape of the common tap terminal 260-1 is a rectangular. However, the present invention is not limited to any shape of the common tap terminal and it may be a round shape. Also, the material of the common tap terminal 260-1 is carbon like that of the switching member 250-1. Also, it may be a copper alloy such as a beryllium copper (BeCu).

More concretely, both end portions of the common tap terminal are inserted in the opposed inner surfaces of the first and second insulating pillar plates 214 and 216 respectively. That is, the coupling bolts 26Oa-I are inserted into two washers (denoted by no reference numeral) and two through holes (denoted by no reference numeral) of the first and second insulating pillar plates 214 and 216 to be coupled and fixed to screw grooves (denoted by no reference numeral) of both end portions thereof.

FIG. 17 illustrates a connecting relation between the control means and the driving means schematically according to the second embodiment of the present invention.

Referring to FIG. 17, since the construction of FIG. 17 is the same as that of FIG. 6 except that the PT circuits 220-1, 220-2 and 220-3 are provided to the first coil in order to measure the high-voltage, further descriptions are is omitted here.

FIG. 18 is a flow chart illustrating an operation of the control means according to the second embodiment of the present invention and FIG. 19 through FIG. 22 are schematic plan views illustrating operation conditions of the high-voltage regulator according to the second embodiment of the present invention.

Referring to FIG. 18 through FIG. 22, the operation order of the control means 280 according to the present invention will be explained by stages.

The tap terminal 244-1 according to the present is provided with seventeenth pieces of Nl through N17 by each phase. Actually, the number of the tap terminal 244-1 is 30 pieces in principle. However, for the convenience of illustration, only the seventeenth pieces of Nl through N17 are shown in the drawings.

Also, the elements, which are not shown in FIG. 18, refer to FIG. 13 through FIG. 17.

Moreover, since the common tap terminals 260-1, 260-2 and 260-3 is always electrically connected to the corresponding switching members 250-1, 250-2 and 250-3 respectively, further descriptions in this regard are is omitted here.

1. Power Supply S210

When a power is applied to the first coil, the SMPS 231a of the power supplier 231 electrically connected to the PT circuit 220-3 is operated.

2. Origin Return S220

As shown in FIG. 19, the controller 282 received the power from the SMPS 231a allows the driving members 235-1, 235-2 and 235-3 of three phases to rotate in a reverse direction, so that the switching members 250-1, 250-2 and 250-3 are electrically connected to the corresponding tap terminals 244- 1, 244-2 and 244-3 of the Nl time respectively. At this time, the switching members 250-1, 250-2 and 250-3 is moved along and always electrically connected to the common tap terminals 260-1, 260-2 and 260-3 for performing a guide function respectively.

Here, the origin return is to electrically connect the switching members 250-1, 250-2 and 250-3 to the corresponding terminals 244-1, 244-2 and 244-3 of the Nl time respectively.

Accordingly, when the power is applied, the origin return is the first operation.

3. Contact Judgment S230 and Motor Driving S242 and S244

As shown in FIG. 18, the sensor 284-1, 284-2 and 284-3 and the controller 282 of the control means 280 according to the present invention are connected to each other by means of a "Hi" signal line and a "Lo" signal line respectively, so that the controller 282 receives only the "Hi" relay contact signal and "Lo" relay contact signal. That is, the controller 282 has no effect on the "Go" relay contact signal.

The controller 282 judges whether the contact is "Lo" or not.

If the contact signal is "Lo" relay contact, the driving members 235- 1, 235-2 and 235-3 are made one revolution in a positive direction. If not ( "Hi" relay contract), the driving members 235-1, 235-2 and 235-3 are made one revolution in a reverse direction.

Continuously, where the driving of driving members 235-1, 235-2 and 235-3 is completed, the contact judgment S230 and the motor driving S242 and S244 are repeatedly performed, except that the power is off or the mode is manually switched.

FIG. 20 illustrates the performance result of plural routines next to

the origin return according to the second embodiment of the present invention. Here, as shown in FIG. 21, in a state of transmitting each of the "Hi" , "GO" and "Lo" contacts of there phases ( "U" , "V" and "W" ) to each controller 282, the driving members 235-1, 235-2 and 235-3 are in course of rotation in a positive or a reverse direction. Especially, since the "V" phase corresponds to the "Go" contact, the corresponding driving member 235-2 is not operated.

As shown in FIG. 21, in the course of tap-switching, the switching member 250-2 of the "V" phase is electrically connected to one tap terminal 244-2 and the switching members 250-1 and 250-3 are electrically connected to the adjacent two tap terminals 244-1 and 244-3.

Referring to FIG. 20 through FIG. 22, the correlation between the switching members 250-1, 250-2 and 250-3 and the corresponding tap terminals 244-1, 244-2 and 244-3 will be described in order herein below.

First Stop Status (FIG. 20)

(1) The sensor 284-1, 284-2 and 284-3 of the control means 280

As a result of the voltage measurement on each phase ( "U" , "V" and "W" ), the measured value is in the range of the deviation of the reference voltage value, thereby outputting the "Go" signal.

(2) The controller 282 of the control means 280

The driving members 235-1, 235-2 and 235-3 are stopped, so that the switching members 250-1, 250-2 and 250-3 are electrically connected to the N8, N5 and N 9 tap terminals 244-1, 244-2 and 244-3.

Switching Process (FIG. 21) and Final Stop Status (FIG. 22)

(3) The sensor 284-1, 284-2 and 284-3 of the control means 280

The sensor 284-1 of the "U" : as a result of the voltage measurement, the measured value exceeds the deviation range of the reference voltage value, thereby outputting the "Hi" signal.

The sensor 284-2 of the "V" •' as a result of the voltage measurement,

the measured value is in the range of the deviation of the reference voltage value, thereby outputting the "Go" signal.

The sensor 284-3 of the "W" : as a result of the voltage measurement, the measured value is less than the deviation of the reference voltage value, thereby outputting the "Lo" signal.

(4) The controller 282 of the control means 280

The controller 282 allows each driving member 235 to rotate in a positive or reverse direction or stop according to the received signals.

The driving member 235-1 of the "U" phase is rotated in a reverse direction and the switching member 250-1 is moved in the low number direction (Nl). At this time, the switching member 250-1 is firstly electrically connected to the N8 tap terminal 244-1 and is electrically connected to the N8 and N7 tap terminals 244-1 in a moment. Thereafter, the switching member 520-1 is electrically connected to the N7 tap terminal 244-1.

As a result of the repetition in turn as described above, the switching member 250-1 is electrically connected to the N7 tap terminal 244-1 and, then stopped in the end.

Here, in the sensor 284-1, "Go" relay contact is outputted.

The driving member 235-2 of the "V" phase is continuously stopped, so that it maintains a status in that the switching member 250-2 is firstly connected to the N5 tap terminal 244-2.

The driving member 235-3 of the "W" phase is rotated in a positive direction and the switching member 250-3 is moved in the high number direction (N17). At this time, the switching member 250-3 is firstly electrically connected to the N9 tap terminal 244-3 and electrically connected to the NlO and N9 tap terminals 244-3 in a moment. Thereafter, the switching member 250-3 is electrically connected to the NlO tap terminals 244-3.

Here, in the sensor 284-3, "Go" relay contact is outputted.

In the high-voltage regulator 300 according to the second embodiment of the present invention, where the switching members 250-1, 250-2 and 250-3 are

stopped, the switching members 250-1, 250-2 and 250-3 are necessarily connected to one tap terminal 244-1, 244-2 and 244-3. In the course of switching, the switching members 250-1, 250-2 and 250-3 are electrically connected to the adjacent two tap terminals 244-1, 244-2 and 244-3 in a moment and then, is electrically connected to one tap terminal 244-1, 244-2 and 244-3 immediately.

While this invention has been described in connection with what are presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments and the drawings, but, on the contrary, it is intended to cover various modifications and variations within the spirit and scope of the appended claims. [Industrial Applicability]

The present invention relates to The present invention relates to an automatic high voltage regulator in that the voltage drop is compensated at a voluntary time interval against a voltage drop of a distribution line corresponding to the first of the electrical consumer, whereby providing a rated voltage with the high voltage transformer.