KR20000070339A - Flux-controlled type variable transformer - Google Patents

Abstract

Provided is a flux control type variable transformer that controls voltage at high speed without providing a voltage adjusting tap of a transformer. Having a 1st magnetic circuit and a 2nd magnetic circuit, a 1st magnetic circuit makes the 1st U-type cutter core 13 and the 2nd U-type cutter core 11 mutually face the cutter surfaces, and The cutter core on the other hand is rotated by 90 ° in contact with the cutter core. The primary coil 14 common to the first U-shaped cutter core 13 and the second magnetic circuit of the first magnetic circuit is wound, and the secondary coil 17 is wound to the second magnetic circuit, and the first coil is wound. The control coil 12 is wound around the second cutter core 11 of the magnetic circuit, and the value of the excitation current of the control coil 12 is changed so that the magnetism of the first magnetic circuit in which the primary coil 14 is wound is wound. By changing the resistance, the linkage flux between the primary coil 14 and the secondary coil 17 is controlled to continuously vary the voltage of the secondary coil 17.

Description

Magnetic flux control variable transformer {FLUX-CONTROLLED TYPE VARIABLE TRANSFORMER}

There is a demand for flexible power facilities that can cope with voltage fluctuations due to increased power demand and diversification of loads due to recent economic development.

The prior art, which contributes to stabilization of the voltage of the power system, has coped with a tap-switching voltage regulator of a transformer as shown in FIG. The tap-changing type voltage regulator of this transformer has a tap contact portion and a tap switching mechanism, and wears out the tap contact portion, poor contact, and the like. There were some basic usage constraints on performance.

As mentioned above, the conventional tap-changing voltage regulator of a transformer arises because a tap contact part and a tap switching mechanism exist. There are performance problems such as maintenance problems such as wear of the tap contact portion, wear of the tap switching mechanism, and time delay of voltage control due to mechanical operation of the tap switching mechanism.

Accordingly, an object of the present invention is to provide a magnetic flux control type variable transformer for controlling voltage at high speed without providing a voltage adjusting tab of a transformer.

The present invention contributes to stabilization of the voltage of the power system. The non-tap of on-load tap-changing transformer in distribution substations, the non-tap of on-load tap-changing voltage regulator in distribution line system, the column transformer It relates to a stationary voltage regulator, such as a no-tap voltage adjustment with the addition of a secondary voltage constant function.

1 is a perspective view showing one embodiment of a flux control type variable transformer according to the present invention.

2 is a circuit configuration diagram showing an equivalent circuit of the flux control type variable transformer according to the present invention.

3 is a circuit configuration diagram showing an equivalent circuit of a magnetic flux controlled variable transformer connected in three phases.

Fig. 4 is a perspective view showing one embodiment of a flux control type variable transformer for a three-phase transformer.

5 is a circuit configuration diagram showing an equivalent circuit of the flux control type variable transformer for three-phase transformer.

6 is a diagram showing control current versus secondary voltage and auxiliary coil voltage characteristics using the load of the secondary coil as a parameter.

Fig. 7 is a diagram showing the observation waveform of the secondary voltage waveform deformation caused by the control current.

Fig. 8 is a perspective view showing one embodiment of a flux control type variable transformer for removing harmonics of secondary voltage.

FIG. 9 is a circuit diagram illustrating an equivalent circuit of the same flux control variable transformer shown in FIG. 8.

FIG. 10 is a circuit configuration diagram in which the reactor of FIG. 9 is replaced with a variable reactor.

Fig. 11 is a diagram showing the observed waveforms of secondary voltage and current.

Fig. 12 is a perspective view showing one embodiment of the control power supply of the flux control type variable transformer for removing harmonics.

Fig. 13 is a circuit configuration diagram showing an equivalent circuit of the flux control type variable transformer for a three-phase transformer.

Fig. 14 is a circuit arrangement drawing showing one embodiment of the stationary voltage regulator to which the flux control type variable transformer is applied.

Fig. 15 is a circuit diagram showing one embodiment of a stationary voltage regulator to which a magnetic flux controlled variable transformer for a three-phase transformer is applied.

Fig. 16 is a diagram showing an example of the secondary voltage control characteristic of the flux control type variable transformer.

Fig. 17 is a constant voltage control characteristic diagram of a flux control type variable transformer.

Fig. 18 is a circuit configuration diagram of a conventional tap switch type voltage regulator.

This invention has a 1st magnetic circuit and a 2nd magnetic circuit, A 1st magnetic circuit has a 1st U-type cutter core and a 2nd U-type cutter core, mutually opposing the cutter surface, and And the other cutter core by rotating the other cutter core in a direction in which the other cutter core is rotated by 90 ° so as to be in contact with each other, and having a primary coil common to the first U-type cutter core and the second magnetic circuit of the first magnetic circuit. Is wound, the secondary coil is wound around the second magnetic circuit, the control coil is wound around the second cutter core of the first magnetic circuit, and the value of the excitation current supplied to the control coil is changed. By changing the magnetoresistance of the wound first magnetic circuit, the linkage flux between the primary coil and the secondary coil is controlled to continuously vary the voltage of the secondary coil.

The present invention also has a first three-phase magnetic circuit and a second three-phase magnetic circuit, wherein the first three-phase magnetic circuit includes a first three-phase E-type cutter core and a second U-type cutter core, and the cutter faces thereof face each other. The other cutter core is rotated by 90 ° in contact with the cutter core in a direction of twisting to contact the cutter core, and is connected to the first E-type cutter core and the second three-phase magnetic circuit of the first magnetic circuit. The common primary coil is wound, the secondary coil is wound around the second three-phase magnetic circuit, the control coil is wound around the second U-type cutter core of the first magnetic circuit, and the excitation current supplied to the control coil is By changing the value and changing the magnetic resistance of the first three-phase magnetic circuit in which the primary coil is wound, the linkage flux between the primary coil and the secondary coil is controlled to continuously vary the voltage of the secondary coil.

The present invention is to control the induced voltage of the secondary coil by changing the chain flux flux between the primary coil and the secondary coil of the transformer.

In the basic configuration of the present invention, the primary coil common to the first magnetic circuit and the second magnetic circuit is wound, and the secondary coil is wound to the second magnetic circuit. The first magnetic circuit is configured such that the first U-type cutter core and the second U-type cutter core face each other with their cutter surfaces facing each other, and in a direction of twisting the other cutter core with respect to the other cutter core. It consists of a magnetic circuit which is rotated and contacted. The control coil is wound around the second U-type cutter core.

In the three-phase transformer, the three-phase primary coil common to the first three-phase magnetic circuit and the second three-phase magnetic circuit is wound, and the three-phase secondary coil is wound to the second three-phase magnetic circuit. The first three-phase magnetic circuit has a direction in which the first three-phase E-type cutter core and the second U-type cutter core face each other, and the other cutter core is twisted with respect to the other cutter core. A magnetic circuit rotated by 90 ° makes contact. The control coil is wound around the second U-type cutter core.

The control power supply winds the auxiliary coil to the first U-type cutter core of the first magnetic circuit of the flux-controlled variable transformer or the first three-phase E-type cutter core of the three-phase voltage flux controlled variable transformer and connects a rectifier circuit thereto. In the rectifier circuit, a voltage control circuit or an electric circuit connecting the voltage control circuit and the voltage waveform control circuit is configured. By connecting a reaction device or a variable reaction device to the auxiliary coil, deformation of the secondary coil induced voltage is suppressed.

According to the above structure, first, by applying the voltage e1 to the primary coil, the magnetic flux Φ 1-1 is generated in the first magnetic circuit and the magnetic flux Φ 1-2 is generated in the second magnetic circuit. In the primary coil, an excitation current i1 for generating magnetic flux Φ 1-1 in the first magnetic circuit and magnetic flux Φ 1-2 in the second magnetic circuit flows. The voltage induced in the secondary coil wound on the second magnetic circuit generates a voltage e2 in response to the magnetic flux of the second magnetic circuit. Here, when the secondary (load) current i2 flows in the secondary coil, the magnetic flux Φ2 in a direction opposite to the primary coil magnetic flux Φ1-2 is generated in the second magnetic circuit, so that the primary coil is denied. Although a load current flows through the coil, the magnetic flux Φ 1-2 of the second magnetic flux circuit decreases and the secondary voltage e2 falls. At this time, the magnetic flux Φ 1-1 of the first magnetic circuit increases by a considerable decrease of the magnetic flux Φ 1-2 of the second magnetic circuit in order to balance the applied voltage and the induced voltage of the primary coil.

Here, when the current ic flows through the control coil wound around the second cutter core, the control magnetic flux Φ c generated by the ampere turn of the number of turns of the control coil and the control current ic is first and second U. Pass the contact surface of the mold cutter core. The contact surfaces of the first and second U-type cutter cores are the common constituents of the magnetic flux Φ c and the magnetic flux Φ 1-1, and the magnetic resistance to this common passage increases, so that the magnetic flux caused by the applied voltage of the primary coil ( Passing of φ1-1) is suppressed and decreases. Then, in order to balance the applied voltage of the primary coil and the induced voltage, the equivalent of the decrease in the magnetic flux Φ 1-1 of the first magnetic circuit is the increase in the magnetic flux Φ 1-2 of the second magnetic circuit. Since the linkage flux of the primary coil and the secondary coil wound on the magnetic circuit increases, the secondary voltage e2 increases. Next, when the load of the secondary coil decreases and the secondary current i2 decreases, the magnetic flux Φ2 in the opposite direction to the magnetic flux Φ1-2 of the primary coil decreases in the second magnetic circuit. The magnetic flux Φ 1-2 is increased to increase the linkage flux of the primary coil and the secondary coil, thereby increasing the secondary voltage e2.

Here, when the current ic of the control coil wound on the second cutter core is reduced, the number of turns of the control coil and the ampere turn that transfers the control current ic is reduced, so that the first and second U-type cutter cores are reduced. The magnetoresistance of the contact surface of the to the common path decreases, and the passage of the magnetic flux Φ 1-1 by the applied voltage e1 of the primary coil is alleviated and increases. Then, in order to balance the applied voltage e1 of the primary coil and the induced voltage, the magnetic flux is constant in accordance with the applied voltage e1 of the primary coil, and the increase in the magnetic flux Φ1-1 of the first magnetic circuit is equivalent. The minute decreases in the magnetic flux Φ 1-2 of the second magnetic circuit, so that the chain flux of the primary coil and the secondary coil wound on the second magnetic circuit is reduced, and the secondary voltage e2 is lowered.

Here, the magnetic flux Φ 1-1 of the first magnetic circuit is such that when the current ic flows through the control coil wound around the second cutter core, the value of the control current ic is within the variable range of the secondary voltage e2. (Range where the common magnet path does not saturate) In the following, the waveform is disturbed by the change of the magnetoresistance of the common magnet path by the control current ic. For this reason, when the input voltage waveform is a sine wave, the generated magnetic flux by the input voltage may be a sine pie when the combined value of the magnetic flux Φ 1-1 of the first magnetic circuit and the magnetic flux Φ 1-2 of the second magnetic circuit is sufficient. When the deformation occurs in the magnetic flux Φ 1-1 of the first magnetic circuit, the deformation occurs in the magnetic flux Φ 1-2 of the second magnetic circuit, and harmonics are generated in the secondary voltage e2. Therefore, in order to remove the harmonics of the secondary voltage e2, it is necessary to equip the fundamental wave component with the waveform deformation of the magnetic flux Φ 1-1 of the first magnetic circuit.

Therefore, the waveform shaping of the magnetic flux Φ 1-1 of the first magnetic circuit connects the reaction apparatus or the variable reaction apparatus to the auxiliary coil wound around the first magnetic circuit, and when a current flows, the auxiliary coil is connected to the first magnetic circuit. The magnetic flux Φ 3 in the opposite direction to the magnetic flux Φ 1-1 is generated, the magnetic flux density of the first magnetic circuit is lowered, the harmonic current is suppressed, and a current having many fundamental wave components flows. Although a current flows in the primary coil so as to negate the magnetic flux? 3 generated by the current flowing through the auxiliary coil, this current is a current having a large number of fundamental wave components in which harmonic components are suppressed. By doing so, the waveform of the magnetic flux Φ 1-2 of the second magnetic circuit is also improved, so that harmonics are removed from the secondary voltage waveform to preserve the quality of power.

Next, when a rectifier circuit is connected to the auxiliary coil and used as a power source for the control coil current ic wound around the second cutter core, it acts to compensate for the variation of the secondary voltage due to the change in the load current. When the secondary current increases, the transition flux to the first magnetic circuit increases, but the induced voltage e3 of the auxiliary coil increases, thereby increasing the control current ic, and acts to suppress the transition flux. In addition, when the secondary current decreases, the control current is similarly reduced. That is, the control current can be automatically adjusted to compensate for the variation in the secondary voltage against the variation in the secondary current.

As described above, the value of the excitation current of the control coil of the second U-type cutter core is changed, and the magnetic resistance of the first magnetic circuit of the primary coil is changed, so that the linkage flux of the primary coil and the secondary coil is changed. Can be controlled to continuously vary the secondary coil voltage.

Similarly, in the three-phase transformer, the excitation current of the control coil of the second U-type cutter core is changed to change the magnetic resistance of the first three-phase magnetic circuit of the primary coil so that the three-phase primary coil and the three-phase secondary The three-phase linkage flux of the coil can be collectively controlled to continuously vary the three-phase secondary coil voltage.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail with reference to drawings. The basic structure of this invention is the 1st magnetic circuit which consists of the 1st U-type cutter core 13 and the 2nd U-type cutter core 11, and the 2nd which comprises the cutter core 16 in FIG. The primary coil 14 is wound around the magnetic circuit, and the secondary coil 17 is wound around the second magnetic circuit. The first magnetic circuit is configured such that the first U-type cutter core 13 and the second U-type cutter core 11 face each other, and the other cutter core with respect to the other cutter core. The bit constitutes a magnetic circuit brought into contact by rotating 90 ° in the direction. The control coil 12 is wound around the second U-type cutter core 11.

Fig. 2 shows a circuit configuration showing an equivalent circuit of the flux-controlled variable transformer shown in Fig. 1, where X painting shows that two magnetic cores are in contact with a state rotated by 90 °. Like the magnetic core, two magnetic cores are in contact with each other in parallel.

FIG. 3 shows an equivalent circuit of the circuit configuration of the flux control type variable transformer in which the transformer shown in FIG. 1 is connected in three phases.

FIG. 4 is a diagram showing the basic configuration of a three-phase transformer. The first three-phase magnetic circuit composed of the first E-type cutter core 13 and the second U-type cutter core 11 and the cutter core 16 are shown in FIG. The three-phase primary coil 14 common to the second three-phase magnetic circuit to be formed is wound, and the three-phase secondary coil 17 is wound to the second three-phase magnetic circuit. In the first three-phase magnetic circuit, the first three-phase E-type cutter core 13 and the second U-type cutter core 11 face each other, and the cutters of the other side with respect to the other cutter core. A magnetic circuit is formed by contacting the core by rotating it 90 degrees in the direction of twisting. The control coil 12 is wound around the second U-type cutter core 11.

FIG. 5 shows a circuit configuration showing an equivalent circuit of the flux control type variable transformer for three-phase transformer of FIG.

According to the above configuration, first, in FIG. 1, by applying the voltage e1 to the primary coil 14, the magnetic flux Φ 1-1 to the first magnetic circuit and the magnetic flux to the second magnetic circuit ( Φ1-2) occurs. In the primary coil 14, an excitation current i1 for generating magnetic flux Φ 1-1 in the first magnetic circuit and magnetic flux Φ 1-2 in the second magnetic circuit flows. The voltage induced in the secondary coil 17 wound on the second magnetic circuit is a voltage e2 corresponding to the magnetic flux of the second magnetic circuit.

Here, when the current i2 flows in the secondary coil 17, the magnetic flux Φ2 in the opposite direction to the magnetic flux Φ1-2 of the primary coil 14 is generated in the second magnetic circuit, thereby The magnetic flux Φ 1-2 is reduced and the secondary voltage e2 is decreased. At this time, the magnetic flux Φ 1-1 of the first magnetic circuit requires a magnetic flux in which the applied voltage e 1 of the primary coil 14 and the induced voltage are balanced, so that the magnetic flux Φ 1-1 of the second magnetic circuit is balanced. 2) Decrease considerably increases.

Here, when the current ic flows through the control coil 12 wound on the second cutter core 11, the increase in the magnetoresistance of the contact surface common path 15 of the first and second U-type cutter cores results in 1 Passage of the magnetic flux Φ 1-1 by the applied voltage e1 of the vehicle coil 14 is suppressed and decreases. Then, in order to balance the applied voltage e1 of the primary coil 14 and the induced voltage, the reduction equivalent of the magnetic flux? 1-1 of the first magnetic circuit is equal to the magnetic flux? 1-2 of the second magnetic circuit. By increasing, the chain flux of the primary coil 14 and the secondary coil 17 wound on the second magnetic circuit increases, so that the secondary voltage e2 increases.

Next, when the load of the secondary coil 17 increases and the secondary current i2 increases, as described above, the second magnetic circuit is opposite to the magnetic flux Φ 1-2 of the primary coil 14. Direction magnetic flux Φ2 increases, the magnetic flux Φ1-2 of the second magnetic circuit decreases, and the secondary voltage e2 decreases. At this time, the magnetic flux Φ1-1 of the first magnetic circuit requires a magnetic flux in which the primary coil 14 applied voltage e1 and the induced voltage are balanced, so that the magnetic flux Φ1-2 of the second magnetic circuit is balanced. Decrease)). In this case, when the current ic of the control coil 12 wound on the second cutter core is increased, the magnetoresistance of the contact surface common path 15 of the first and second U-type cutter cores is further increased, thereby increasing the primary coil. Passage of the magnetic flux Φ 1-1 by the applied voltage e1 at (14) is suppressed and decreases. In this case, since a magnetic flux in which the applied voltage e1 of the primary coil 14 and the induced voltage are balanced is required, a reduction equivalent of the magnetic flux Φ 1-1 of the first magnetic circuit is the magnetic flux of the second magnetic circuit ( 1-2) increases, the linkage flux of the primary coil 14 and the secondary coil 17 wound on the second magnetic circuit increases, and the secondary voltage e2 increases.

In addition, when the load of the secondary coil 17 decreases and the secondary current i2 decreases, the magnetic flux Φ2 opposite to the magnetic flux Φ1-2 of the primary coil 14 is included in the second magnetic circuit. This decreases. Therefore, the magnetic flux Φ 1-2 of the second magnetic circuit increases, and the linkage flux of the primary coil 14 and the secondary coil 17 increases, and the secondary voltage e2 increases. Here, when the current ic of the control coil 12 wound on the second cutter core 11 is reduced, the magnetoresistance of the contact surface common passage 15 of the first and second U-type cutter cores is reduced, so that 1 Passage of the magnetic flux Φ 1-1 by the applied voltage e1 of the vehicle coil 14 is relaxed and increases. Then, in order to balance the applied voltage e1 of the primary coil 14 and the induced voltage, the magnetic flux is constant in accordance with the applied voltage e1 of the primary coil 14, and the magnetic flux of the first magnetic circuit ( An increase equivalent to φ 1-1 becomes a decrease in the magnetic flux Φ 1-2 of the second magnetic circuit, so that the chain flux of the primary coil 14 and the secondary coil 17 wound on the second magnetic circuit is reduced. As a result, the secondary voltage e2 decreases. The relationship between the control current and the secondary voltage when the applied voltage e1 of the primary coil is made constant is as shown in Figs. 6C and 6E.

Here, the magnetic flux Φ 1-1 of the first magnetic circuit changes the magnetoresistance to the common channel by the instantaneous value of (ic) when a current current ic flows through the control coil wound around the second cutter core. When the control current ic is within the variable range of the secondary voltage, the waveform is disturbed as shown in FIG. 7 by the control current ic. For this reason, as described above, deformation occurs in the magnetic flux Φ 1-2 of the second magnetic circuit, and harmonics occur in the secondary voltage e2.

Fig. 8 shows a perspective view showing one embodiment of a magnetic flux controlled variable transformer for removing harmonics of the secondary voltage e2.

FIG. 9 shows a circuit configuration showing an equivalent circuit of the flux control type variable transformer illustrated in FIG. The reaction device 19 is connected to the auxiliary coil 18 wound on the first magnetic circuit to react the induced voltage e3 generated in the auxiliary coil 18 according to the load current i2 or the control current ic. When applied to the device 19 and a current flows through the reaction device 19, the auxiliary coil 18 generates a magnetic flux Φ 3 in a direction opposite to the magnetic flux Φ 1-1 of the first magnetic circuit. The magnetic flux density of the magnetic circuit is lowered, harmonic currents are suppressed, and a current i3 having many fundamental wave components flows. As described above, the waveform of the magnetic flux? 1-2 of the second magnetic circuit is also improved, and the secondary voltage ( Harmonics are removed from the waveform of e2) to preserve power quality.

FIG. 10 shows that the inductance of the reaction device 19 can be adjusted by adjusting the secondary voltage as the reaction device connected to the auxiliary coil as the variable reaction device. The auxiliary coil 18 is connected to the main coil 22 and the rectifier circuit 20 of the variable reaction device, and the rectifier circuit 20 is constituted by the waveform control circuit 24 as a control power supply. The excitation current supplied to the control coil 23 of the variable reactor is suppressed by the waveform control circuit 24 to adjust the variable reactor to the optimum value.

11 is an oscilloscope showing the improvement of the secondary voltage waveform by the connection of the reaction apparatus 19.

12 and 13 show an embodiment in which the rectifier circuit 20 connected to the auxiliary coil 18 is used as a power source for the control coil current ic wound around the second cutter core as a control power source. Fig. 6 shows control current (ic) vs. secondary voltage (e2) and auxiliary coil voltage (e3) characteristics using the load of the secondary coil as parameters, and accordingly the load and control current (ic) of the secondary coil. And the mutual relationship between the secondary voltage (e2) and the auxiliary coil voltage (e3). That is, the voltage of the secondary coil decreases with the increase of the load and rises with the increase of the control current (ic). In addition, the auxiliary coil voltage e3 has a characteristic of rising with increasing load and decreasing with increasing control current ic.Always, the auxiliary coil voltage e3 changes in accordance with the variation of the load, but the control current ic It satisfies the conditions of the power supply to the extent that is required. 6, it can be seen that the change of the secondary voltage e2 and the auxiliary coil voltage e3 caused by the change in the load current i2 is reversed. In other words, when the secondary voltage e2 decreases due to the increase of the load by setting the auxiliary coil voltage e3 as the power source of the control current ic, the auxiliary coil voltage e3 increases and the control current ic ) Increases to act to suppress the decrease of the secondary voltage e2, thereby compensating for the voltage variation of the secondary voltage e2.

As described above, the magnetic resistance of the first magnetic circuit of the primary coil 14 is changed by changing the value of the excitation current ic of the control coil 12 of the second U-type cutter core 11, By controlling the linkage flux between the primary coil 14 and the secondary coil 17, it is possible to continuously vary the secondary coil voltage e2.

Fig. 14 shows a circuit configuration of a stationary voltage regulator using a flux control type variable transformer, which is one embodiment of the present invention, and the adjustment of the kind shown in Fig. 14 and the secondary voltage e2 to the linkage flux control between coils is shown. As a result, high-speed control is possible and there is no wear of the contact mechanism or the like. The structure of the device is a copper iron stop device composed of a magnetic core and a coil, and can be provided as a power system voltage stabilization device that requires high reliability in durability, repairability, and performance.

Fig. 15 shows a circuit configuration of a stationary voltage regulator to which a magnetic flux controlled variable transformer for a three-phase transformer is applied.

Fig. 16 discloses an example of the secondary voltage control characteristics of the flux control variable transformer. This shows the control characteristics of the secondary voltage e2 in the circuit configuration of one embodiment in which the magnetic flux controlled variable transformer for the three-phase transformer shown in FIG. 15 is applied to the stationary voltage regulator. It may be necessary to continuously vary the secondary voltage e2 by ic).

17 shows an example of the constant voltage control characteristic of the flux control type variable transformer. This shows the constant voltage control characteristic of the secondary voltage e2 in the circuit configuration of one embodiment in which the magnetic flux controlled variable transformer for the three-phase transformer shown in FIG. 15 is applied to the stationary voltage regulator. The control current (ic) of the control coil 12 for constantly controlling the secondary voltage e2 is shown.

An object of the present invention is to provide a magnetic flux control type variable transformer for controlling voltage at high speed without providing a voltage adjusting tab of a transformer. The basic configuration of the present invention is a chain flux amount between a primary coil and a secondary coil of a transformer. Is changed by using a variable inductance to control the induced voltage of the secondary coil. In addition, various modifications can be made without departing from the scope of the present invention.

Industrial Applicability According to the present invention, an increase in power demand in recent years and diversification of loads provide a flexible power equipment that can cope with diversification of loads such as fluctuations in grid voltage, and to stabilize voltages in power systems. Can contribute.

Claims (10)

The first magnetic circuit has a first magnetic circuit and a second magnetic circuit, and the first magnetic circuit has the first U-type cutter core and the second U-type cutter core facing each other with the cutter surfaces facing each other, and with respect to the other cutter core. The other cutter core is rotated by 90 degrees in the direction of twisting to be in contact with each other, and the primary coil common to the first U-type cutter core and the second magnetic circuit of the first magnetic circuit is wound, and the second The secondary magnetic coil is wound around the magnetic circuit, the control coil is wound around the second cutter core of the first magnetic circuit, and the value of the excitation current supplied to the corresponding control coil is changed so that the primary magnetic coil is wound around the primary coil. A magnetic flux controlled variable transformer comprising varying the magnetic flux of the primary coil and the secondary coil to vary the magnetic resistance of the secondary coil to continuously change the voltage of the secondary coil. The first three-phase magnetic circuit has a first three-phase magnetic circuit and a second three-phase magnetic circuit, and the first three-phase magnetic circuit includes a first three-phase E-type cutter core and a second U-type cutter core with the cutter surfaces facing each other, The other cutter core is rotated by 90 ° in contact with the cutter core in a twisting direction, and the primary coil common to the first E-type cutter core and the second three-phase magnetic circuit of the first magnetic circuit is formed. Winding, winding the secondary coil to the second three-phase magnetic circuit, winding the control coil to the second U-type cutter core of the first magnetic circuit, changing the value of the excitation current supplied to the control coil, By varying the magnetoresistance of the first three-phase magnetic circuit in which the coil is wound, the flux flux of the primary coil and the secondary coil is controlled to continuously vary the voltage of the secondary coil. Transformers. The flux control type variable transformer according to claim 1, wherein an auxiliary coil is wound around a first U-type cutter core of the first magnetic circuit. The flux control type variable transformer according to claim 2, wherein an auxiliary coil is wound around a first three-phase E-type cutter core of the first three-phase magnetic circuit. The flux control type variable transformer according to claim 3, wherein a reaction device is connected to the auxiliary coil. The flux control type variable transformer according to claim 4, wherein a reaction device is connected to the auxiliary coil. 6. The flux control type variable transformer according to claim 5, wherein the reaction device is a variable reaction device. 7. The flux control type variable transformer according to claim 6, wherein the reaction device is a variable reaction device. The flux control type variable transformer according to claim 3 or 4, wherein an excitation power source of the control coil is obtained from an auxiliary coil. The flux control type variable transformer according to claim 4 or 6, wherein an excitation power supply of the control coil is obtained from an auxiliary coil.