JP3343083B2 - Linkage flux control type transformer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a substation of a power system, a transformer device of a power receiving facility of a customer, and the like, and automatically compensates for a voltage fluctuation of a power system and a voltage fluctuation due to a load fluctuation. The present invention relates to a flux linkage control type transformer device capable of stabilizing a secondary (load) voltage.

[0002]

2. Description of the Related Art In recent years, the demand for electricity has increased due to economic development,
Flexible power equipment that can cope with voltage fluctuations and the like due to diversification of loads and the like is being demanded. The conventional technology that contributes to stabilization of the voltage of the power system has been dealt with by a tap- switching voltage regulator of a transformer as shown in FIG. The tap switching type voltage regulator of this transformer has a tap contact portion and a tap switching mechanism, and in addition to the abrasion of the tap contact portion, poor contact, etc., time delay of voltage control due to the operation of the tap switching mechanism and wear of the mechanism. Basically, there were restrictions on use in terms of maintenance and performance.

On the other hand, the present applicant has previously proposed a magnetic flux control type variable transformer (Japanese Patent Application No. 9-83793) for controlling the interlinkage magnetic flux between the primary winding and the secondary winding. FIG.
FIG. 1 is a perspective view showing an embodiment of a magnetic flux control type variable transformer previously proposed by the present applicant.
As shown in FIG. 7, the primary winding 14 and the secondary winding 19, a transformer magnetic circuit 21, U-shaped cut cores 11 and 13, which are in contact with each other by being rotated by 90 degrees in the torsion direction, and a control winding 12. .

[0004] The secondary voltage e2 of the transformer is the primary winding 1
4 is determined by the value of φ1-2 interlinked with the secondary winding 19 of the magnetic fluxes φ1-1 and φ1-2, but when the load current i2 flows through the secondary winding, the magnetic flux φ2 in the opposite direction to φ1-2. Occurs, φ1-2 shifts to the magnetic circuit side of φ1-1 and decreases, and the secondary voltage decreases. Therefore, the exciting current ic is passed through the control winding 12 to make the contact portion 15 of the U-shaped cut core.
, The magnetic resistance of the magnetic circuit of φ1-1 increases, and the magnetic flux distribution of φ1-1 and φ1-2 changes, so that the secondary voltage can be increased.

However, in this transformer, when there is no load, no magnetic flux φ2 cancels out the magnetic flux φ1-2 due to the primary winding current. The distribution of the magnetic fluxes φ1-1 and φ1-2 is inversely proportional to the magnetic resistance of each magnetic circuit. However, the magnetic circuit of φ1-1 includes the contact portion 15 of the U-shaped cut core, and the magnetic resistance is large. Even when there is no exciting current of the winding 12, the current is concentrated and distributed to φ1-2. Therefore, the secondary voltage e2
However, even if an exciting current is supplied to the control winding 12, only the direction in which the secondary voltage e2 is increased can be controlled. Therefore, if the secondary voltage e2 is designed without taking this into consideration, the adjustment range of the secondary voltage e2 is narrowed.

When a load current flows through the secondary winding 19, the voltage rises in the leakage reactance portion of the primary winding 14 and the magnetic flux φ1-2 increases, so that the secondary voltage e2 increases. The exciting current of the control winding 12 is increased to
-1 to increase the magnetic resistance of the magnetic circuit and reduce the leakage reactance of the primary winding 14 to suppress the voltage rise.
2, which causes an increase in magnetic flux, and the adjustment range is narrowed.

[0007]

The magnetic flux control type variable transformer previously proposed by the present applicant has a characteristic problem that the voltage adjustment width at the time of no load and at the time of the load becomes narrow due to the magnetic circuit configuration. .

Accordingly, the present invention provides a flux linkage control type transformer device for actively controlling the flux linkage between the primary winding and the secondary winding in order to widen the voltage adjustment range irrespective of the load condition. The purpose is to provide.

[0009]

According to the first aspect of the present invention, there is provided the following:
And a second magnetic circuit, wherein the first magnetic circuit has a first U-shaped cut core and a second U-shaped cut core with their cut surfaces facing each other, and The other cut core is twisted 9
The second magnetic circuit includes a third U-shaped cut core and a fourth U-shaped cut core, the cut surfaces of which are opposed to each other, The first cut core is constituted by a magnetic circuit in which the other cut core is rotated by 90 degrees in a torsion direction and brought into contact with one cut core, and
A primary winding wound around a first U-shaped cut core of the first magnetic circuit and a third U-shaped cut core of the second magnetic circuit;
A secondary winding is wound around a third U-shaped cut core of the magnetic circuit, and a leakage flux control winding is wound around a second U-shaped cut core of the first magnetic circuit. The fourth U-shaped cut core has a main magnetic flux control winding wound thereon, and changes the values of the exciting currents of the main magnetic flux control winding and the leakage magnetic flux control winding. The magnetic resistance of the second magnetic circuit is changed to control the interlinkage magnetic flux between the primary winding and the secondary winding, thereby continuously varying the secondary winding voltage. .

According to a second aspect of the present invention, there is provided a first three-phase magnetic circuit and a second three-phase magnetic circuit, wherein the first three-phase magnetic circuit comprises a first E-shaped cut core and a first U-shaped cut core. A second cut core is formed by a magnetic circuit in which cut surfaces of the cut cores are opposed to each other, and one cut core is brought into contact with the other cut core by rotating the cut core by 90 degrees in a twisting direction. The phase magnetic circuit is configured such that the second E-shaped cut core and the second U-shaped cut core have their cut surfaces opposed to each other, and the other cut core is twisted in the torsional direction with respect to one cut core.
A three-phase magnetic circuit constituted by a magnetic circuit rotated and contacted by 0 degrees and common to a first E-shaped cut core of a first three-phase magnetic circuit and a second E-shaped cut core of a second three-phase magnetic circuit A primary winding is wound, a three-phase secondary winding is wound around a second E-shaped cut core of the second three-phase magnetic circuit, and a first U-shaped cut core of the first three-phase magnetic circuit is wound. Is wound with a leakage flux control winding, a main flux control winding is wound around a second U-shaped cut core of a second three-phase magnetic circuit, and the main flux control winding and the leakage flux control winding are By changing the value of the exciting current and changing the magnetic resistance of the first three-phase magnetic circuit and the second three-phase magnetic circuit of the primary winding, the chain of the three-phase primary winding and the three-phase secondary winding is changed. Collectively control the magnetic flux,
It is characterized in that the three-phase secondary winding voltage is continuously varied.

According to a third aspect of the present invention, in the first aspect, an auxiliary winding is wound around the first U-shaped cut core of the first magnetic circuit.

According to a fourth aspect of the present invention, in the second aspect, an auxiliary winding is wound around the first E-shaped cut core of the first three-phase magnetic circuit.

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention controls the induced voltage of a secondary winding by changing the amount of interlinkage magnetic flux between a primary winding and a secondary winding of a transformer. The basic configuration of the present invention is such that a primary winding common to a first magnetic circuit and a second magnetic circuit is wound,
The first U-shaped cut core and the second U-shaped cut core have their cut surfaces opposed to each other, and the other cut core is twisted 90 degrees with respect to one cut core. It is composed of a magnetic circuit rotated and contacted by degrees. A leakage flux control winding is wound around the second U-shaped cut core. The second magnetic circuit has the same configuration as the first magnetic circuit, and a secondary winding is wound around the third U-shaped cut core.
The main flux control winding is wound around the U-shaped cut core of No. 4.

In the case of a three-phase transformer, a three-phase primary winding common to the first three-phase magnetic circuit and the second three-phase magnetic circuit is wound,
The first three-phase magnetic circuit is configured such that the first E-shaped cut core and the first U-shaped cut core have their cut surfaces facing each other, and one cut core is connected to the other cut core. It is composed of a magnetic circuit rotated 90 degrees in the twisting direction and brought into contact. A leakage flux control winding is wound around the first U-shaped cut core. The second three-phase magnetic circuit has a configuration similar to that of the first three-phase magnetic circuit, in which a three-phase secondary winding is wound around a second E-shaped cut core, and a main magnetic flux is wound on a second U-shaped cut core. Wind the control winding.

According to the above-described configuration, first, the voltage adjustment at the time of no load is performed by applying the voltage e1 to the primary winding so that the magnetic flux φ1-1 and the second magnetic circuit are applied to the first magnetic circuit. Generates a magnetic flux φ1-2. An exciting current i1 for generating a magnetic flux φ1-1 in the first magnetic circuit and a magnetic flux φ1-2 in the second magnetic circuit flows through the primary winding. The voltage induced in the secondary winding wound around the second magnetic circuit is induced by a voltage corresponding to the magnetic flux of the second magnetic circuit.

The magnetic resistances of the first magnetic circuit and the second magnetic circuit can be adjusted by exciting currents of the leakage magnetic flux control winding and the main magnetic flux control winding. When there is a load, when a secondary (load) current i2 flows through the secondary winding, a magnetic flux that cancels the magnetic flux of the primary winding is generated in the second magnetic circuit.
Although a part of the load current flows through the winding , the secondary voltage e2 decreases without recovering the magnetic flux of the second magnetic circuit. At this time, the magnetic flux of the first magnetic circuit increases by an amount corresponding to the decrease of the magnetic flux of the second magnetic circuit because the applied voltage of the primary winding and the induced voltage are balanced. Here, when an exciting current is applied to the leakage magnetic flux control winding wound around the second U-shaped cut core, the magnetic flux generated by the magnetomotive force causes the first and second U-shaped cut cores of the first magnetic circuit. , The magnetic resistance of the contact surfaces of the first and second U-shaped cut cores increases. Therefore, the passage of the magnetic flux of the first magnetic circuit due to the applied voltage of the primary winding is suppressed and reduced, and the applied voltage of the primary winding and the induced voltage are balanced. Correspondingly second
The magnetic flux of the magnetic circuit increases, and the interlinkage magnetic flux between the primary winding and the secondary winding wound on the second magnetic circuit increases, so that the secondary voltage e2 increases.

When the load on the secondary winding decreases and the secondary current decreases, the magnetic flux of the secondary winding of the second magnetic circuit increases, and the flux linkage between the primary and secondary windings increases. Increases, and the secondary voltage e2 increases. Here, when the exciting current of the leakage magnetic flux control winding is reduced, the control magnetic flux decreases, and the magnetic resistance of the common magnetic path at the contact surface between the first and second U-shaped cut cores of the first magnetic circuit. Decreases, the magnetic flux of the first magnetic circuit increases and the magnetic flux of the second magnetic circuit decreases, and the secondary voltage e2 decreases.

The above-described control by the exciting current of the leakage flux control winding adjusts a magnetic flux that does not interlink with the secondary winding. When viewed as an equivalent circuit, the leakage reactance value of the primary winding is adjusted and the secondary winding is controlled. It can be said that the voltage is controlled.

When the secondary (load) current is zero and there is no load, the secondary voltage can be increased but not decreased even if the leakage flux control winding is excited. Therefore, when an exciting current is applied to the main magnetic flux control winding wound around the fourth U-shaped cut core of the second magnetic circuit, the magnetic flux generated by the magnetomotive force generates the third, fourth, and fourth magnetic fluxes of the second magnetic circuit. , The magnetic resistance of the contact surfaces of the third and fourth U-shaped cut cores increases. Then, the passage of the magnetic flux of the second magnetic circuit by the voltage applied to the primary winding is suppressed and reduced, and the flux linkage of the secondary winding is reduced, and the secondary voltage is reduced. As described above, even when no load is applied, the excitation current flows through the main flux control winding together with the leakage flux control winding, and the distribution of the magnetic flux by the primary winding is controlled by adjusting the excitation currents of the two. And the secondary voltage can be controlled. In the case of an advancing load current, the voltage due to the advancing current component rises in the leakage reactance portion of the primary winding, so the exciting current of the leakage flux control winding is increased to reduce the leakage reactance and suppress the voltage rise. Meanwhile, the flux linkage between the primary winding and the secondary winding is adjusted by the exciting current of the main magnetic flux control winding. When the exciting current of the main magnetic flux control winding is increased, the magnetic resistance of the second magnetic circuit forming the main magnetic path of the transformer is increased and the exciting reactance is reduced. The power factor of the lead as seen from the primary side is improved, and the voltage rise is suppressed.

As described above, regardless of the state of the load,
Changing the value of the exciting current of the leakage flux control winding and the main flux control winding, and actively changing the magnetic resistance of the first magnetic circuit and the magnetic resistance of the second magnetic circuit of the primary winding, The flux linkage between the primary winding and the secondary winding is controlled, so that the secondary winding voltage can be continuously varied. Similarly, in the three-phase transformer, the value of the exciting current of the leakage flux control winding and the value of the exciting current of the main flux control winding are changed, and the magnetic resistance of the first magnetic circuit and the magnetic resistance of the second magnetic circuit of the primary winding are changed. , And the three-phase linkage magnetic flux of the three-phase primary winding and the three-phase secondary winding is collectively controlled, so that the three-phase secondary winding voltage can be continuously varied. .

(Embodiment) FIG. 1 is a perspective view for explaining an embodiment of a flux linkage control type transformer device according to the present invention, wherein a first magnetic circuit comprises a first U-shaped cut core 13 and Second
The second magnetic circuit includes a third U-shaped cut core 18 and a fourth U-shaped cut core 16. The first magnetic circuit includes a first U-shaped cut core 1
3 and the second U-shaped cut core 11 by a magnetic circuit in which the cut surfaces thereof are opposed to each other, and the other cut core is rotated by 90 degrees in the torsional direction with respect to one cut core to make contact therewith. In the second magnetic circuit, the third U-shaped cut core 18 and the fourth U-shaped cut core 16 are arranged such that their cut surfaces face each other, and one cut core has the other cut core. It consists of a magnetic circuit in which the cut core is rotated by 90 degrees in the twisting direction and brought into contact.

The first magnetic circuit and the second magnetic circuit have first and second magnetic circuits.
The primary winding 14 is wound around the third U-shaped cut cores 13 and 18, and the secondary winding 19 is wound around the third U-shaped cut core 18 of the second magnetic circuit. A leakage flux control winding 12 is wound around the second U-shaped cut core 11 of the first magnetic circuit, and a main flux control winding 17 is wound around the fourth U-shaped cut core 16 of the second magnetic circuit. .

FIG. 2 is a circuit diagram showing an equivalent circuit of the flux linkage control type transformer device shown in FIG.
A cross mark indicates that the two magnetic cores are in contact with each other while being rotated by 90 degrees, and a cross mark indicates the arrangement symbol of a normal transformer core. FIG. 3 shows an equivalent circuit of a circuit configuration of a flux linkage control type transformer device in which the transformers of FIG. 1 are connected in three phases.

FIG. 4 is a perspective view for explaining an embodiment of a three-phase interlinkage flux control type transformer device. The first magnetic circuit is composed of a first E-shaped cut core 13 and a first U-shaped cut core. Shaped cut core 1
1, and the second magnetic circuit includes a second E-shaped cut core 18 and a second U-shaped cut core 16. The first E-shaped cut core 13 and the first U-shaped cut core 11 of the first magnetic circuit are arranged so that their cut surfaces face each other, and the other cut core is twisted with respect to one cut core. It is composed of a magnetic circuit rotated 90 degrees in the direction and brought into contact. The second magnetic circuit includes a second E-shaped cut core 18 and a second E-shaped cut core.
And the U-shaped cut core 16 is constituted by a magnetic circuit in which the cut surfaces are opposed to each other, and the other cut core is rotated by 90 degrees in the torsional direction and brought into contact with one cut core. It is the same as FIG. 1 except that the primary winding 14 and the secondary winding 19 are three-phase.

The first and second magnetic circuits,
Primary winding 14 common to second E-shaped cut cores 13 and 18
And the second E-shaped cut core 18 of the second magnetic circuit
Is wound around the secondary winding 19. The first U of the first magnetic circuit
A leakage flux control winding 12 is wound around the cut core 11, and a main flux control winding 17 is wound around the second U-shaped cut core 16 of the second magnetic circuit. FIG. 5 is a circuit diagram showing an equivalent circuit of a three-phase linkage magnetic flux control type transformer device.

According to the configuration shown in FIG. 1, the voltage adjustment at the time of no load is performed by applying the voltage e1 to the primary winding 14 so that the magnetic flux φ1-1 is applied to the first magnetic circuit and the magnetic flux φ1-1 is applied to the second magnetic circuit. φ
1-2 occurs. In the primary winding 14, an exciting current i1 for generating a magnetic flux φ1-1 in the first magnetic circuit and a magnetic flux φ1-2 in the second magnetic circuit flows. As the voltage induced in the secondary winding 19 wound around the second magnetic circuit, a voltage e2 corresponding to the magnetic flux of the second magnetic circuit is generated. Here, the magnetic flux of the second magnetic circuit can be arbitrarily adjusted by the exciting currents ic1 and ic2 of the leakage magnetic flux control winding 12 of the first magnetic circuit and the main magnetic flux control winding 17 of the second magnetic circuit. That is, the magnetic flux for the voltage e1 of the primary winding is equal to the magnetic flux between the first magnetic circuit and the second magnetic circuit.
And the magnetic resistances of the first magnetic circuit and the second magnetic circuit can be adjusted by the exciting currents ic1 and ic2 of the leakage magnetic flux control winding 12 and the main magnetic flux control winding 17. .

The voltage adjustment in the presence of the load current i2 is performed in such a manner that when the secondary (load) current i2 flows through the secondary winding 19, the second magnetic circuit has a direction opposite to the magnetic flux φ1-2 of the primary winding 14. Is generated, and the load current i1 flows through the primary winding 14 so as to cancel the magnetic flux φ2, but the magnetic flux φ1-2 of the second magnetic circuit is generated.
Decreases, and the secondary voltage e2 decreases. At this time, the magnetic flux φ1-1 of the first magnetic circuit is equal to the magnetic flux φ1- of the second magnetic circuit because the applied voltage e1 of the primary winding and the induced voltage are balanced.
It increases by an amount corresponding to the decrease of 2. Here, when the exciting current ic1 flows through the leakage magnetic flux control winding 12 wound around the second cut core, the control magnetic flux φc1 generated by the magnetomotive force (ampere turn) multiplied by the number of windings and the exciting current becomes the first magnetic flux φc1. It passes through the contact surface 15 of the first and second U-shaped cut cores 13 and 11 of the magnetic circuit.

The contact surfaces of the first and second U-shaped cut cores form a common magnetic path of the magnetic flux φc1 and the magnetic flux φ1-1. The magnetic resistance of the common magnetic path increases, and the applied voltage of the primary winding increases. And the passage of the magnetic flux φ1-1 is suppressed and reduced. Then, since the applied voltage e1 of the primary winding 14 and the induced voltage are balanced,
The magnetic flux φ1-2 of the second magnetic circuit increases correspondingly to the decrease of the magnetic flux φ1-1 of the first magnetic circuit, and the primary winding 14 wound on the second magnetic circuit and the secondary winding Since the interlinkage magnetic flux of the winding 19 increases, the secondary voltage e2 increases.

Next, when the load on the secondary winding 19 decreases and the secondary current i2 decreases, the primary winding 1 is added to the second magnetic circuit.
4, the magnetic flux φ2 in the opposite direction to the magnetic flux φ1-2 decreases, the magnetic flux φ1-2 increases, and the primary winding 14 and the secondary winding 1
The interlinkage magnetic flux of No. 9 increases, and the secondary voltage e2 increases. Here, when the exciting current ic1 of the leakage magnetic flux control winding 12 wound around the second cut core of the first magnetic circuit is reduced,
The magnetomotive force (ampere turn) multiplied by the number of turns and the exciting current ic1 is reduced, and the magnetoresistance of the common magnetic path 15 at the contact surfaces of the first and second U-shaped cut cores 13 and 11 of the first magnetic circuit is reduced. Is reduced, and the magnetic flux φ1 due to the applied voltage e1 of the primary winding is reduced.
The passage of -1 is alleviated and increased. Then, the primary winding 14
Since the applied voltage e1 and the induced voltage are balanced, the magnetic flux is constant according to the applied voltage e1 of the primary winding, and the second magnetic circuit corresponds to the increase of the magnetic flux φ1-1 of the first magnetic circuit. Of the primary winding 14 and the secondary winding 19 wound on the second magnetic circuit decrease, and the secondary voltage e2 decreases.

If there is a secondary (load) current i2, the shift amount of φ1-2 of the second magnetic circuit to the first magnetic circuit by φ2 is adjusted by controlling the exciting current ic1 of the leakage flux control winding. , Increase or decrease the amount of interlinkage magnetic flux of the secondary winding,
2 can be adjusted, but when there is no secondary current with no load, even if the leakage flux control winding is excited, control to increase φ1-2 is possible, but control to decrease φ1-2 is not possible. Then, when an exciting current is excited in the main magnetic flux control winding 17 wound around the fourth U-shaped cut core 16 of the second magnetic circuit, the control magnetic flux φc2 according to the exciting current ic2, 3, passing through the connecting surface of the fourth U-shaped cut cores 18, 16; Third and fourth U
The contact surface of the shaped cut core forms a common magnetic path of φ1-2 and magnetic flux φc2, and the magnetic resistance of this common magnetic path increases,
The magnetic flux φ1-2 decreases. Therefore, even when no load is applied, the excitation current is supplied to the main magnetic flux control winding together with the excitation current of the leakage magnetic flux control winding, and the excitation currents of both are adjusted to distribute φ1-1 and φ1-2. Can be controlled, for example, the secondary voltage can be reduced by reducing φ1-2. In the case of advanced load current,
Since the voltage due to the leading current component rises in the leakage reactance portion of the primary winding 14, the exciting current ic1 of the leakage magnetic flux control winding 12 is increased to reduce the leakage reactance, thereby suppressing the voltage rise. 14 and secondary winding 1
9 are adjusted by the exciting current ic2 of the main magnetic flux control winding 17. When the exciting current of the main magnetic flux control winding is increased, the magnetic resistance of the second magnetic circuit forming the main magnetic path of the transformer is increased, the exciting reactance is reduced, and a reactor for lagging is inserted into the load. And the power factor as seen from the primary side is improved, and the voltage rise is suppressed.

FIG. 6 is a vector diagram when the conventional load tap switching voltage regulator as shown in FIG. 16 is constructed in accordance with the present invention as shown in FIG. 7, where _Io is the main _symbol . The exciting current corresponding to the exciting magnetic flux of the magnetic path, E1 is the induced voltage of the primary winding, I1 is the load current, I is the primary current of the sum of _Io and I1, IX1 is the leakage reactance voltage drop of the primary winding, V
1 is the primary winding terminal voltage, E2 is the induced voltage of the secondary winding, P
Is the tap position of the primary winding, and V2 is the secondary voltage.

In FIG. 6, for example, to keep the secondary voltage V2 constant irrespective of the magnitude of the load current I1, the voltage ratio (E2 / E1) is constant, so that the triangle OQR may be fixed. while a constant IX1 by adjusting the leakage reactance X, is a constant α by adjusting the excitation current I _0. In the case of changing the voltage condition, to adjust the leakage reactance X and the exciting current I ₀ in accordance with the magnitude and power factor of the load current so that a new balance condition.

FIG. 8 shows an example in which an auxiliary winding 27 is provided on the first U-shaped cut core of the first magnetic circuit. By providing the auxiliary winding, an excitation power supply for the leakage magnetic flux control winding can be obtained, and the harmonics of the secondary voltage waveform can be reduced. Prior application (Japanese Patent Application No. 9-837)
No. 93), and a description thereof will be omitted. It is clear that a three-phase auxiliary winding may be wound around the first E-shaped cut core 13 for the three-phase type.

FIG. 9 shows the exciting current ic of the leakage magnetic flux control winding.
10 shows the control characteristics of the secondary voltage e2 by the control of FIG. 1, and FIG. 10 shows the control characteristics of the secondary voltage e2 by the control of the exciting current ic2 of the main magnetic flux control winding 17. From the figure, it can be understood that the secondary voltage e2 can be controlled over a wide range by controlling both exciting currents ic1 and ic2 of the leakage magnetic flux control winding and the main magnetic flux control winding. Therefore, the exciting current ic1 of the leakage magnetic flux control winding is controlled based on the secondary (load) current value, and the exciting current ic2 of the main magnetic flux control winding is changed to the secondary voltage e2.
, It is possible to obtain a transformer (power supply) having desired voltage-current characteristics of the secondary winding.

FIG. 11 shows the correlation between the secondary voltage e2 and the induced voltage e3 of the auxiliary winding 27 by controlling the exciting current ic1 of the leakage flux control winding 12 using the load of the secondary winding as a parameter. It is shown. As shown in the figure, the induced voltage e3 of the auxiliary winding increases with an increase in the load on the secondary winding, and decreases with an increase in the control current ic1. The secondary voltage e2 decreases as the load increases, and increases as the control current ic1 increases. This characteristic indicates that the excitation of the leakage flux control winding by the output of the auxiliary winding can compensate for the decrease in the secondary voltage due to the increase in load.

Therefore, as described above, the exciting current of the leakage flux control winding is controlled by the current ic1 which is substantially proportional to the secondary (load) current i2, and the exciting current ic of the main magnetic flux control winding is controlled.
2 is excited when the secondary voltage exceeds a predetermined value, so that the secondary excitation current ic1 and ic2 are controlled to control the secondary voltage with respect to the secondary (load) current variation despite the power system voltage variation. Can be automatically stabilized to a constant value range. FIG. 12 shows this control characteristic.

FIG. 13 shows that the leakage flux control winding 12 is excited via the rectifier 22 by the induced voltage e3 of the auxiliary winding 27, and the secondary winding of the transformer 25 connected to the secondary winding 19. 5 shows an equivalent circuit of a three-phase secondary voltage stabilized flux linkage control type transformer device that excites a main flux control winding via a saturable reactor 26 and a rectifier 23. The saturable reactor saturates when the secondary voltage reaches a predetermined set value, which can be changed by changing the tap of the transformer connected to the reactor and / or the secondary winding. By this secondary voltage stabilizing flux linkage control type transformer device, the secondary voltage is stabilized near a voltage exceeding the saturation set value of the reactor.

FIG. 14 shows a three-phase secondary voltage-stabilized interlinkage flux control type transformer device. The output of the current transformer 24 inserted in the circuit of the secondary winding 19 causes the leakage flux to flow through the rectifier 22. An example in which the control winding 12 is excited is shown. FIG. 15 shows an example of a voltage-stabilized flux linkage control type transformer device in which the conventional tap switching transformer shown in FIG. 16 is non-tapped.

[0044]

As described above, according to the present invention, by controlling both exciting currents of the leakage magnetic flux control winding and the main magnetic flux control winding, it is possible to continuously adjust the secondary voltage without tapping. And a power source having a desired voltage-current characteristic can be formed by controlling both exciting currents.
A secondary voltage stabilizing transformer device for compensating voltage fluctuations due to power system voltage fluctuations and load fluctuations can be configured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a flux linkage control type transformer device according to the present invention.

FIG. 2 is a circuit diagram showing an equivalent circuit of a flux linkage control type transformer device.

FIG. 3 is a circuit diagram showing an equivalent circuit of a three-phase connected flux linkage control type transformer device.

FIG. 4 is a perspective view showing an embodiment of a three-phase interlinkage flux control type transformer device.

FIG. 5 is a circuit configuration diagram showing an equivalent circuit of a three-phase linkage flux control type transformer device.

6 is a vector diagram in a case where the conventional load tap switching voltage regulator as shown in FIG . 16 is configured according to the present invention as shown in FIG. 7;

FIG. 7 is a circuit configuration diagram of a voltage regulator configured according to the present invention.

8 is a perspective view showing an embodiment in which an auxiliary winding is provided in the flux linkage control type transformer device of FIG. 1;

FIG. 9 is a diagram showing control characteristics of a secondary voltage by an exciting current of a leakage magnetic flux control winding.

FIG. 10 is a diagram showing control characteristics of a secondary voltage by an exciting current of a main magnetic flux control winding.

FIG. 11 is a diagram showing the relationship between the exciting current of the leakage flux control winding and the voltages of the auxiliary winding and the secondary winding, using the load of the secondary winding as a parameter.

FIG. 12 is a diagram showing a stabilization characteristic of a secondary voltage with respect to a load change.

FIG. 13 is a diagram showing an embodiment of a secondary voltage stabilized flux linkage controlling transformer device.

FIG. 14 is a diagram showing another embodiment of a secondary voltage stabilized flux linkage controlling transformer device.

FIG. 15 is a diagram showing an embodiment in which the conventional tap switching transformer shown in FIG. 16 is configured as a secondary voltage stabilizing transformer device according to the present invention.

FIG. 16 shows a conventional on-load tap switching voltage regulator.

FIG. 17 is a perspective view showing an example of a conventional flux control type variable transformer previously proposed by the present applicant.

[Explanation of symbols]

11... The second U-shaped cut core of the first magnetic circuit, the first
A first U-shaped cut core of a three-phase magnetic circuit , 12: a leakage flux control winding, 13: a first U-shaped cut core of a first magnetic circuit
A, the first E-shaped cut core of the first three-phase magnetic circuit , 14
... primary winding, 15 ... contact surface of the cut core surface comrades of the first magnetic circuit, 16 ... fourth U-shaped second magnetic circuit Kattoko
A, the second U-shaped cut core of the second three-phase magnetic circuit , 17
... Main flux control winding, 18 ... Third U-shaped second magnetic circuit
Cut core, second E-shaped cut core of the second three-phase magnetic circuit
A , 19: secondary winding, 20: contact surface between cut core surfaces of the second magnetic circuit, 21: magnetic circuit for transformer, 22, 23
... Rectifier, 24 ... Current transformer, 26 ... Saturable reactor, 2
7 ... Auxiliary winding.

──────────────────────────────────────────────────続 き Continued on the front page (72) Mineo Kawakami 2-1, Nakayama 7-chome, Aoba-ku, Sendai, Miyagi Prefecture Inside the R & D Center of Tohoku Electric Power Co., Inc. Chome 2-1 Tohoku Electric Power Co. R & D Center (72) Inventor Hiromi Yagi 2-2-1 Miyauchi Tagajo City, Miyagi Prefecture Tohoku Electric Manufacturing Co., Ltd. (72) Inventor Takayuki Ito Tagajo City, Miyagi Prefecture Miyauchi 2-2-1 Tohoku Electric Manufacturing Co., Ltd. (56) References JP-A-10-214732 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01F 29/14

Claims (4)

(57) [Claims] The first magnetic circuit has a first U-shaped cut core and a second U-shaped cut core, and the first magnetic circuit has a cut surface between them. The second U-shaped cut core comprises a magnetic circuit in which one cut core is opposed to each other, and the other cut core is rotated by 90 degrees in a torsion direction and brought into contact with one cut core. The fourth U-shaped cut core is constituted by a magnetic circuit in which the cut surfaces are opposed to each other, and the other cut core is rotated by 90 degrees in the torsional direction with one cut core to make contact therewith, A primary winding is wound around a first U-shaped cut core of the first magnetic circuit and a third U-shaped cut core of the second magnetic circuit, and a third U-shaped cut core of the second magnetic circuit is formed. Is wound with a secondary winding, and the second U-shaped cut core of the first magnetic circuit is provided with a leakage magnetic flux control. A main magnetic flux control winding around a fourth U-shaped cut core of the second magnetic circuit;
By changing the value of the exciting current of the main magnetic flux control winding and the leakage magnetic flux control winding, and changing the magnetic resistance of the first magnetic circuit and the second magnetic circuit of the primary winding, the primary winding and the A flux linkage control type transformer device characterized in that the flux linkage of the secondary winding is controlled and the secondary winding voltage is continuously varied. 2. A first three-phase magnetic circuit having a first three-phase magnetic circuit and a second three-phase magnetic circuit, wherein the first three-phase magnetic circuit includes a first E-shaped cut core and a first U-shaped cut core. The cut surfaces are made to face each other, and one cut core is constituted by a magnetic circuit in which the other cut core is rotated by 90 degrees in a twisting direction and brought into contact with the other cut core, and the second three-phase magnetic circuit comprises: The second E-shaped cut core and the second U-shaped cut core are brought into contact with each other so that the cut surfaces thereof face each other, and the other cut core is rotated by 90 degrees in the twisting direction with respect to one cut core. And a first three-phase magnetic circuit.
A common three-phase primary winding is wound around the E-shaped cut core and the second E-shaped cut core of the second three-phase magnetic circuit, and the second E-shaped cut core of the second three-phase magnetic circuit has A three-phase secondary winding is wound, a leakage flux control winding is wound around a first U-shaped cut core of a first three-phase magnetic circuit, and a second U-shaped cut of a second three-phase magnetic circuit is formed. A main flux control winding is wound around the core, the value of the exciting current of the main flux control winding and the leakage flux control winding is changed, and a first three-phase magnetic circuit of a primary winding and a second three-phase magnetic circuit are formed. By changing the magnetic resistance of the magnetic circuit, collectively controlling the interlinkage magnetic flux of the three-phase primary winding and the three-phase secondary winding, continuously varying the three-phase secondary winding voltage. Three-phase voltage linkage flux control type transformer device. 3. An interlinkage flux control type transformer device according to claim 1, wherein an auxiliary winding is wound around a second U-shaped cut core of the first magnetic circuit. Transformer equipment. 4. An interlinkage flux control transformer device according to claim 2, wherein an auxiliary winding is wound around a first E-shaped cut core of the first three-phase magnetic circuit. Controlled transformer device.