JP2005252113A - Voltage controlled transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a voltage controlled transformer having simple iron core structure and capable of suppressing local overheat, extending a control range of an output voltage, reducing waveform distortion, and attaining a large capacity at low cost and high reliability. <P>SOLUTION: The voltage controlled transformer comprises 1st and 2nd iron cores forming a closed magnetic path; a bypass iron core; primary coils wound so as to surround the 1st and 2nd iron cores and the bypass iron core; secondary coils wound so as to surround the 1st and 2nd iron cores; control coils wound around the 1st and 2nd iron cores in series or in parallel in mutually reverse directions; and bypass iron core control coils wound around these iron cores in series or in parallel in the mutually reverse directions. Each the 1st and 2nd iron cores is composed of a common leg and upper and lower divided yokes, and control coils are wound around the yokes, and the bypass core is composed of two iron cores. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a voltage regulating transformer that is inexpensive and suitable for large capacity, and more specifically, can provide a secondary voltage (output voltage) that is stable against a wide range of primary input power fluctuation and secondary output power fluctuation. The present invention relates to a magnetic flux control type voltage regulating transformer.

  In recent years, dispersive power sources such as wind power generation and solar power generation have been increasingly used as environmentally friendly power sources that emit almost no harmful substances. However, the power generated by wind power and solar illuminance fluctuates over time in these dispersive power supplies, so when used as part of the power system, the system frequency and system voltage caused by fluctuations in the power supplied to the system There is concern about the deterioration of grid power quality such as waveforms. Therefore, various methods are used as a measure for stabilizing the power supplied from such a distributed power source.

  First, there is a system that uses a mechanical tap switching transformer. Usually, when a plurality of taps are provided on the primary winding or the secondary winding, and the voltage on the primary side or the secondary side fluctuates, for example, when the voltage on the secondary side increases, this is detected and the specified value The secondary side voltage is controlled by switching the tap to return to.

  However, in this method, switching is gradual and cannot be performed continuously. Furthermore, the secondary side on which power is flowing must be switched while being live, and the switching requires a response time of at least 5 to 6 seconds, and the voltage fluctuation is likely to occur due to the slow response time. There is a point.

  Secondly, as a method capable of continuous switching, a saturable reactor is connected in series to the primary side outside the transformer, and the DC current flowing through the control winding of the saturable reactor is increased or decreased to increase or decrease the saturable reactor. There is also a method of controlling the voltage on the primary side of the transformer to control the voltage on the primary side of the transformer so that the voltage on the secondary side becomes a specified value.

  However, with this method, continuous switching is possible. However, in order to ensure a sufficient variable range, the capacity of the saturable reactor is increased, and it is desirable as an electric power system such as an increase in loss and a deterioration in waveform distortion rate. In general, it cannot be used, and there is a problem that the first mechanical tap switching type or the like must be used.

  Thirdly, static voltage regulators such as SVC and SVG using semiconductor elements such as thyristors have been introduced as systems capable of continuous and high-speed voltage control.

  However, these static voltage regulators have a complicated and expensive control system structure compared to existing electromagnetic devices, and also have problems such as lack of reliability related to system surges and overvoltages. There is.

  Furthermore, in these static voltage regulators, when the voltage is changed by phase control, harmonics are generated and the waveform distortion rate deteriorates, so the variable adjustment range is reduced so as not to adversely affect the power system. It was necessary to take measures such as using a filter and a filter. This is a problem that is common to some extent with the system using the saturable reactor.

Fourth, in recent years, a research presentation of a magnetic flux control type voltage regulator that has a relatively simple structure that does not use semiconductor elements such as thyristors and can be applied to existing electromagnetic device manufacturing technology, but has a continuous adjustment function. Are in succession.
As the shape of the iron core of the magnetic flux control type adjuster, various types such as an orthogonal type, a stacked parallel type, and a rice field type have been proposed.

However, these magnetic flux control type transformers have a common problem that the iron core structure is complicated and local overheating is likely to occur, so that it is difficult to put it into practical use except for a small capacity of around 100 kVA. .
Among them, especially the orthogonal type has a complicated iron core structure, and the laminated surfaces of the steel plates intersect at the orthogonal part, so it is not suitable for enlargement such as the need to insert an insulation film for preventing short circuit, and local heating is likely to occur. There was a problem.

With reference to FIG. 1, the case of a laminated parallel core type iron core structure will be described for a conventional magnetic flux control type transformer.
In FIG. 1, the iron core 10 forming a closed magnetic circuit is wound with primary and secondary coils N1, N2 each having a number of turns N1, N2. The iron core 10 has the same type of thin plate member in the depth direction of the drawing. Alternatively, they are formed so as to overlap in the vertical direction.

The primary core part 11 includes an opening part 11c and two legged iron cores 11a and 11b separated by the opening part 11c.
The control coils Nc1 and Nc2 having the same number of turns are wound around the iron cores 11a and 11b. When both the control coils are connected in series and a direct current Ic is passed, the iron cores 11a and 11b are excited in the opposite direction to form an annular shape. The magnetic flux φc is connected so as to be generated.

  Considering the operation of this magnetic flux control type transformer, first, when AC voltage v1 is applied to the primary coil with no load and zero control coil current, magnetic flux φ1 proportional to the integral value of AC voltage v1 is induced, The magnetic flux φ1 induces a secondary voltage v2 proportional to the differential value of the magnetic flux φ1, that is, the turn ratio of the primary coil and the secondary coil, in the secondary coil.

Next, when a load is connected to the secondary side, a load current i2 flows through the secondary coil, and a secondary magnetic flux is generated by the magnetomotive force. When this secondary magnetic flux is linked to the primary coil, a voltage is induced and applied voltage In addition to the excitation current for the original magnetic flux φ1, a current having a magnetomotive force that just cancels the linkage of the secondary magnetic flux flows through the primary coil.
Thus, the interlinkage magnetic flux of the primary coil returns to the original no-load value φ1 and is balanced.

  Although it can be considered that all the magnetic fluxes under no load pass through the iron core, a considerable amount of magnetic flux passes through the gap between the coils due to the magnetomotive force of the load current. This magnetic flux is called leakage magnetic flux, and its phase is in phase with the load current, and the change in secondary voltage is equal to the induced voltage due to this leakage magnetic flux.

  The induced voltage due to this leakage magnetic flux is called leakage reactance voltage, and the phase of the load current is shifted by 90 °.

  The secondary voltage component in phase with the load current is called the resistance voltage, the vector sum of both is called the impedance voltage, and the ratio of the leakage reactance voltage to the impedance voltage is called the% reactance voltage. For example, in the case of a normal concentric transformer, it is designed to be around 10%.

  Moreover, in the transformer of this structure, the phenomenon that the magnetic flux of the iron cores 11a and 11b wound with the control coil is saturated due to the presence of the DC magnetic field φc by the control coil is utilized. 11b generates heat locally, but since the control coil is wound, heat dissipation is poor, and it is difficult to put it into practical use only for a small electric power with a small variable control range and at most 100 kVA.

  Moreover, in the transformer of this structure, when the secondary voltage is reduced by the amount corresponding to the leakage reactance (that is, about 10% in the case of the concentric arrangement type as described above), the control range of the leakage reactance is reduced. It was difficult to take widely.

MAG-03-114, IEEJ Magnetics Study Group MAG-03-115, IEEJ Magnetics Study Group

  An object of the present invention is to provide a magnetic flux control type voltage regulating transformer that can be continuously controlled at a high speed in order to solve the above-mentioned problems and that can be applied with conventional electromagnetic device manufacturing technology. An object of the present invention is to provide a voltage regulating transformer that is free from local overheating, has a wide output voltage control range, has low waveform distortion, is inexpensive, has high reliability, and can have a large capacity.

  In order to achieve the above object, a voltage regulating transformer according to claim 1 of the present invention is wound so as to surround first and second iron cores forming a closed magnetic circuit and the first and second iron cores. The primary coil, the secondary coil wound so as to surround the first and second iron cores, and the first and second iron cores are wound in series or in parallel and in opposite directions to each other. And a control coil.

  Preferably, according to claim 2, the first and second iron cores, the third iron core (hereinafter referred to as a bypass iron core) forming a closed magnetic circuit, and the first and second iron cores and the bypass iron core are surrounded. The primary coil wound, the secondary coil wound so as to surround the first and second iron cores, and the first and second iron cores are wound in series or in parallel and in opposite directions to each other. And a control coil.

  Preferably, according to a third aspect of the present invention, the bypass iron core is formed of an open magnetic circuit.

  Preferably, according to claim 4, the bypass iron core further includes two iron cores, and includes a bypass iron core control coil wound around the two iron cores in series or in parallel and in opposite directions to each other. .

  Preferably, according to claim 5, the first and second iron cores include a common leg portion and a yoke portion in which one or both of the upper and lower yoke portions are divided, and the control coil is the first coil. It is wound around the divided yoke portion of the second iron core.

  Preferably, according to a sixth aspect of the present invention, the first and second iron cores are wound iron cores.

  Preferably, according to a seventh aspect of the present invention, the control coil is wound at a position farthest from the primary and secondary coils.

  The voltage adjustment transformer according to claim 8 of the present invention made to achieve the above object comprises three sets of voltage adjustment transformers corresponding to the respective phase voltages of the three-phase AC power, and each of the voltage adjustment transformers. The transformer is wound so as to surround the first and second iron cores, the third iron core (hereinafter referred to as bypass iron core) forming the closed magnetic circuit, and the first and second iron cores and the bypass iron core. A secondary coil wound around the first and second iron cores, and a control coil wound around the first and second iron cores in series or in parallel and in opposite directions. The bypass iron core has a separate leg corresponding to each of the three phases and a return path composed of a common yoke portion.

  Preferably, according to claim 9, one or both of separate leg portions or common yoke portions corresponding to each of the three phases of the bypass iron core are composed of two iron cores, and the two iron cores are connected in series or in parallel. And a bypass iron core control coil wound in opposite directions.

  The voltage regulating transformer according to claim 10 of the present invention, which has been made to achieve the above object, comprises a main core composed of three legs arranged in a triangular shape corresponding to each phase voltage of three-phase AC power, A primary coil and a secondary coil wound so as to surround the main iron core, and an annular shape (hereinafter, including a case of a circular shape or a “muscle shape”) provided on both or one of the upper and lower sides of the main iron core. And two control coils wound in series or in parallel and in opposite directions on the iron cores of the two yoke portions.

  Preferably, according to claim 11, a main iron core composed of three legs arranged in a triangular shape corresponding to each phase voltage of the three-phase AC power and an annular 2 provided on both or one of the upper and lower sides of the main iron core. Two yoke parts, a control coil wound in series or in parallel on the iron cores of the two yoke parts, and a bypass iron core consisting of three legs juxtaposed on the main iron core consisting of the three legs. And the secondary coil is wound around the main iron core, and the primary coil is wound around the main iron core and the parallel bypass iron cores.

  Preferably, according to a twelfth aspect of the present invention, the bypass iron core composed of the three legs further includes an annular common yoke portion provided on both or one of the upper and lower sides thereof.

  Preferably, the annular common yoke portion of the bypass iron core further comprises two iron cores, and a bypass iron core control coil wound around the two iron cores in series or in parallel and in opposite directions to each other. It is characterized by including.

  In order to achieve the above object, a voltage regulation transformer according to claim 14 of the present invention comprises three sets of voltage regulation transformers corresponding to respective phase voltages of three-phase AC power, and each of said voltage regulation transformers. The transformer includes a main core composed of two wound cores, a bypass core juxtaposed on one of the longitudinal sides of the main core, the primary coils wound around the two wound cores and the bypass core, and the two A secondary coil wound around a wound core, and a control coil wound in series or in parallel and in opposite directions to each other at a position farthest from the primary and secondary coils of the two wound cores, The bypass iron core is provided with an annular common yoke portion provided on both or one of the upper and lower sides thereof.

  Preferably, according to claim 15, the common yoke portion of the bypass iron core further includes two iron cores, and includes a bypass iron core control coil wound around the two iron cores in series or in parallel and in opposite directions to each other. It is characterized by.

  In the present invention, the phenomenon that the magnetic flux of the iron core around which the control coil is wound is saturated is utilized. However, according to the present invention, the iron core is saturated locally rather than locally. High nature. Furthermore, since the adjustment range can be increased, the required control can be performed without increasing the depth of saturation so much that there is an effect that it can be put to practical use not only for low power but also for high power.

  Also in the present invention, when the secondary voltage is lowered by the leakage reactance, according to the present invention, the control range of the leakage reactance can be widened, so the control range of the secondary voltage is widened. There is an effect that can be taken.

  Further, according to the present invention, by utilizing the structure of the yoke portion of the main iron core or the bypass iron core, there is an effect that a compact and economical three-phase AC transformer can be obtained.

Hereinafter, embodiments of the voltage regulating transformer according to the present invention will be described in detail with reference to the accompanying drawings.
At the same time, the description of the same part as the conventional case may be omitted.

A voltage regulating transformer according to the first embodiment will be described with reference to FIG.
2A is an equivalent circuit diagram, FIG. 2B is a top view, and FIG. 2C is an elevation view. For simplicity, the circuit portions other than the coil and the iron core are omitted in FIGS.

(Construction)
In the present embodiment, the main iron core composed of the first and second iron cores 21 and 22 forming the laminated closed magnetic circuit, the primary coil N1, the secondary coil N2 wound so as to surround them, the first And control coils Nc1 and Nc2 wound in the same number of turns in series with the second iron cores 21 and 22 in opposite directions.
Hereinafter, a set of the iron cores 21 and 22 having this shape is referred to as a “stacked two-divided iron core”.

(Function and effect)
Unlike conventional laminated parallel type iron cores, a thin plate for laminating is punched out to form an opening with a precise dimension, which does not require a difficult process, especially in the case of a large capacity. You only need to stand side by side.
That is, the structure is simple, and the manufacture is particularly easy when the capacity is large.
In addition, since the local heat generation concentration of the control coil portion is lower than in the case of the laminated parallel type iron core, heat dissipation is facilitated and the capacity can be increased.

A voltage regulating transformer according to the second embodiment will be described with reference to FIG.
3A is an equivalent circuit diagram, FIG. 3B is a top view, and FIG. 3C is an elevation view. For simplicity, the circuit portions other than the coil and the iron core are omitted in FIGS.

(Construction)
In the present embodiment, the main iron core composed of the first and second iron cores 21 and 22 forming the laminated closed magnetic circuit, the bypass iron core 30, the primary coil N1 wound so as to surround all of these, and the first The secondary coil N2 wound so as to surround the second iron cores 21, 22 and the control coil Nc1 wound in series with the first and second iron cores 21, 22 in the same number of turns in the opposite directions. , Nc2.
That is, a bypass iron core 30 wound only on the primary coil N1 is added to the laminated two-divided iron core type voltage regulating transformer of the first embodiment.

(Function)
First, it is assumed that there is no load (the load Load is in an open state) and the control coil current Ic is zero. When the AC voltage v1 is applied to the primary coil N1, magnetic fluxes φ1, φ2, and φ3 are induced in the iron cores 21, 22, and 30, and the secondary voltage v2 is induced in the secondary coil N2, but is induced in the primary coil. Of the generated magnetic flux, the main magnetic flux (φ1 + φ2) is reduced by the amount φ3 bypassed by the bypass iron core 30, and accordingly the interlinkage magnetic flux of the primary and secondary coils is reduced, and the secondary voltage is also reduced at that ratio.

  Next, when a certain finite control coil current Ic is applied in the no-load state, the two iron cores 21 and 22 that share the main magnetic flux by half are DC-excited in opposite directions by Ic. In each cycle, the direction of the alternating magnetic fluxes φ1 and φ2 induced by the primary voltage v1 is in the same direction as or opposite to that of the direct-current magnetic flux due to Ic, and is in opposite phase between the two iron cores. Therefore, when one of the iron cores 21 and 22 approaches saturation, the other moves away from saturation. The permeability of the iron core approaching the saturation region decreases, and the magnetic resistance increases.

  Since the magnetic flux passes through the bypass core 30 where the magnetic resistance is small, that is, the iron cores 21 and 22 that are far from saturation and the bypass iron core 30 in the end, the amount of magnetic flux φ1˜ φ3 is determined.

  As described above, as the overall operation, when the control coil current Ic is increased, the iron core saturation proceeds gently, and the induced voltage to the secondary coil gradually decreases. Therefore, since the iron core saturation is not local but global, local overheating is mitigated, and saturation progresses with the parallel balance of the three iron cores, resulting in a circuit configuration in which waveform distortion is close to the minimum.

  The operation at the time of load is basically the same as that at the time of no load, but a leakage magnetic flux between the primary coil and the secondary coil due to the flow of the load current is added. That is, in the case of no load, the leakage flux of the bypass core is changed by controlling the DC magnetization to change the saturation degree of the main core, and the amount of flux linkage to the secondary coil is changed. The leakage magnetic flux generated by the magnetomotive force of the load current is added to this. Thus, the magnetic flux is controlled by increasing / decreasing the control coil current, the impedance voltage of the transformer is changed, and linear voltage adjustment is made in a short time response.

(effect)
Since the bypass iron core intentionally generates and absorbs a predetermined amount of leakage magnetic flux (magnetic flux that does not pass through the secondary coil), there is less loss of effective power than in the case of the first embodiment, and waveform distortion and locality due to iron core saturation. The secondary voltage can be set to a predetermined value over a wider range than in the first embodiment by suppressing overheating to a minimum and adjusting the size of the bypass core.

(Construction)
In FIG. 3, the bypass iron core 30 in the second embodiment forms a closed magnetic circuit having four sides 30a to 30d. However, the bypass iron core 30 in this embodiment has a side 30a surrounded by the primary coil N1. But lacks all or part of 30b-d.

(effect)
The upper limit of the adjustment range of the secondary voltage can be set to a value closer to the secondary voltage when there is no bypass iron core than when the bypass iron core is a closed magnetic circuit as in the second embodiment.
Also, the open magnetic circuit core is easier to manufacture than the closed magnetic circuit core.

A voltage regulating transformer according to a fourth embodiment will be described with reference to the equivalent circuit diagram of FIG.
(Construction)
In the present embodiment, in the second embodiment, the bypass iron core is divided into two to form laminated two-core iron cores 31 and 32, which are provided with bypass iron core control coils Nc3 and Nc4 wound in series in opposite directions.
The bypass iron cores 31 and 32 are closed magnetic paths in this embodiment, but may be open magnetic paths as in the third embodiment.

(Function and effect)
Since the amount of bypass (leakage) magnetic flux can be adjusted by the direct current Ic2 flowing through the bypass iron core control coil, the magnetic flux of the main iron core, and hence the secondary voltage can be increased by a corresponding amount over a wider range than in the second and third embodiments. High speed (for example, 5 cycles = within 100 msec) and continuous variable control are possible.
There are two control parameters (the control current Ic1 of the main iron core and the control current Ic2 of the bypass iron core), and adjustment is easy. For example, the other parameter can be selected so that the adjustment sensitivity of one parameter is appropriate, i.e., the sensitivity is not low and not sensitive.

A voltage regulating transformer according to a fifth embodiment will be described with reference to an equivalent circuit diagram of FIG.
(Construction)
In the present embodiment, the main iron core is composed of a leg part and upper and lower yoke parts, and both the upper and lower yokes are divided into two parts. That is, the leg portions 27 and 28 are common to the first and second iron cores, but the upper yoke portion 41 and the lower yoke portion 43, and the upper yoke portion 42 and the lower yoke portion 44 are respectively the first and second iron cores. And the upper and lower yoke parts are butt-joined to the leg parts. The control coils Nc11 and 21, 12 and 22 are wound around the upper yoke and the lower yoke, respectively, in series and in opposite directions.
The heavy primary coils 11, 12 and the secondary coils 21, 22 are attached to the leg portions 27, 28 of the main iron core before attaching the upper yokes 41, 42 and the upper yoke of the bypass iron core 30, and the light control coils Nc 11, 21, 12, and 22 are attached to the upper and lower yoke portions.

(Function and effect)
In this embodiment, the iron core structure is further simplified and the manufacture becomes easy.
In the case of a laminated iron core, at least the upper yoke must be attached after the coil is attached to the leg part. Especially in the case of a lap joint, there has been a difficult process of inserting and attaching thin plates one by one. In this embodiment, this difficult process can be avoided by butt jointing the upper yoke in particular.

  As a modification of the present embodiment, for example, the bypass iron core 30 can be further divided into two by the same method as the main iron core, and a bypass iron core control coil can be provided in the yoke portion. Even in such a case, light control coils (main iron core and bypass iron core) can be attached to the yoke portion, and heavy primary and secondary coils can be attached to the leg portion, so that manufacture is easy.

A voltage regulating transformer according to the sixth embodiment will be described with reference to FIG.
FIG. 6 (A) is a top view and FIG. 6 (B) is an elevation view.
(Construction)
Compared with the second embodiment, the present embodiment is different in that the first and second iron cores 21 and 22 constituting the main iron core are formed not by a laminated iron core but by a wound iron core.
The bypass iron core 30 is a single bar-shaped open magnetic path laminated iron core in this embodiment. For example, as shown in FIG. 7 (A) top view and FIG. As with the winding cores 31 and 32, bypass iron core control coils Nc3 and Nc4 may be provided as in the fourth embodiment.

(Function and effect)
It is only necessary to prepare two wound cores that do not require joint work and are capable of batch machine winding (four bypass cores are added as shown in Fig. 7), so the main core and / or the bypass core This two-part structure is simpler and easier to manufacture.

(Construction)
In Examples 2 to 6, the control coil is provided farthest from the primary and secondary coils.
In the above embodiment, the primary and secondary coils are usually provided concentrically for the purpose of minimizing the amount of leakage magnetic flux between the two coils.
Therefore, in Examples 1 to 4 and 6, in the center of the opposite side (leg part) of the side (leg part) around which the secondary coil is wound, in Example 5, the center of the upper and lower yoke parts. The control coil is wound on the top.

(Function and effect)
The waveform distortion rate can be lowered by increasing the impedance of the primary and secondary coils with respect to the control coil.

While the second to seventh embodiments are all related to a single-phase voltage regulating transformer, the following eighth to fifteenth embodiments are all three-phase voltage regulating transformers. It is concerned.
All the drawings for explaining these embodiments are composed of a top view (A) and an elevation view (B). For simplicity, circuit portions other than the coil and the iron core are omitted, and a part of the coil and the iron core are also omitted. is there.

  First, a three-phase voltage regulating transformer according to an eighth embodiment will be described with reference to FIG.

(Construction)
In the present embodiment, the first phase of the three-phase voltage regulating transformer is formed by concentrically winding a primary and secondary coil N11, N21 around a main iron core composed of iron cores 21, 22 forming first and second closed magnetic circuits. The control coils Nc11 and 21 are wound in series and in opposite directions at positions opposite to the primary and secondary coils of the iron cores 21 and 22, and the primary coil also winds the third iron core 31. Formed with.
Similarly, the second and third phases are formed.
At that time, the bypass iron core 30 has the iron cores 31, 33, 35 of the respective phases as three legs, and has yokes 51, 53 common to the upper and lower sides.

(Function and effect)
The principle of operation is the same as that of the corresponding single-phase voltage regulating transformer, for example, the one according to the second embodiment. However, unlike the case where three sets are paralleled, the common yokes 51 and 53 bypass each phase. As a result of being able to omit the individual return of the iron core, it is possible to reduce the cost and size.

  A three-phase voltage regulating transformer according to the ninth embodiment will be described with reference to FIG.

(Construction)
The present embodiment is different from the eighth embodiment in that the bypass iron core is divided into two parts and a bypass iron core control coil is wound around each.
That is, for example, the first-phase bypass iron core is composed of 31 and 32, and the bypass iron core control coils Nc41 and Nc42 are wound in series in opposite directions to each other.
In the present embodiment, all bypass iron cores 31 to 36 have common upper and lower yokes 51 and 53.

(Function and effect)
The principle of operation is the same as that of the corresponding single-phase voltage regulating transformer, for example, the one according to the fourth embodiment. As a result of being able to omit the separate return paths of the two sets of bypass iron cores, the cost can be reduced and the size can be reduced.
In this embodiment, the bypass iron core has been described as having two separate leg portions corresponding to each of the three phases, but the common yoke portion (both the upper and lower sides of the common yoke portion or one of the upper and lower sides) is described. ), Or when the separate leg portion and the common yoke portion (both the upper and lower sides of the common yoke portion, or one of the upper and lower sides) are both provided, the corresponding effects can be obtained. .

  A three-phase voltage regulating transformer according to the tenth embodiment will be described with reference to FIG.

(Construction)
In this embodiment, tripods 21, 23, and 25 made of a laminated core of the main iron core are arranged in a triangle, each of which has a secondary coil N 21, N 22, N 23 and a primary coil N 11, N 12, N13 is wound. (In the figure, for simplicity, only the coils N11 and N21 for the first phase are shown.)

  At the top and bottom of the three legs of the main iron core, there are annular yokes 41, 42, 43, 44 common to the three legs, 41 and 42 are provided at the upper part, 43 and 44 are provided at the lower part, and each yoke consists of a wound iron core It is butt-jointed to a tripod (pressure contact with a tightening stat).

  Further, control coils Nc11 and Nc21, Nc12 and Nc22, Nc13 and Nc23 are wound around the yokes 41 and 42 in series and in opposite directions at three locations of the upper yokes 41 and 42, respectively. (In the figure, only the first set of control coils Nc11 and Nc21 is shown for simplicity.)

  Similarly, control coils Nc14 and Nc24, Nc15 and Nc25, and Nc16 and Nc26 are wound around the lower yokes 43 and 44, respectively. (For the sake of simplicity, only the lower yoke 44 and the control coil Nc24 are shown in the figure.)

(Function and effect)
The principle of operation is the same as that of the corresponding single-phase voltage regulating transformer, for example, the one according to the first embodiment. Can be reduced in size at low cost since only three yoke parts of the main iron core are required.

  A three-phase voltage regulating transformer according to the eleventh embodiment will be described with reference to FIG.

(Construction)
In the present embodiment, compared with the tenth embodiment, bypass iron cores 31, 33, and 35 are added so that only the primary coils N11, N12, and N13 are wound.
(Function and effect)
The principle of operation is the same as that of the corresponding single-phase voltage regulating transformer, for example, the one according to the third embodiment, particularly the third embodiment, in which the bypass iron core is composed of only 30a. Unlike the case, since the total of the three phases requires only three leg portions of the main iron core and four yoke portions in the vertical direction, it can be reduced in cost and size.

  A three-phase voltage regulating transformer according to a twelfth embodiment will be described with reference to FIG.

(Construction)
In the present embodiment, compared to the laminated bypass iron cores 31, 33, 35 in the eleventh embodiment, annular common yokes 51, 53 made of a wound iron core are mounted (butt joint) on the upper and lower sides thereof.

(Function and effect)
The principle of operation is the same as that of the eighth embodiment, but the three-phase arrangement is better symmetric than that of the eighth embodiment (FIG. 8), providing balanced and low distortion characteristics. it can.
Furthermore, since the total of the three phases requires only three legs of the main iron core and four yoke parts of the main iron core, it is possible to reduce the cost and size.

  A three-phase voltage regulating transformer according to a thirteenth embodiment will be described with reference to FIG.

(Construction)
In the present embodiment, compared with the laminated bypass iron cores 31, 33, 35 in the tenth embodiment, the annular common yokes 51, 52, 53, 54 each including two winding iron cores on the upper and lower sides thereof. (Only 54 is not shown) is attached (butt joint).
Further, bypass iron core control coils Nc41 and Nc42, Nc43 and Nc44, and Nc45 and Nc46 are wound around the yokes 51 and 52 in series and in opposite directions at three locations of the upper yokes 51 and 52 of the bypass iron core.

For simplicity, only Nc41 and Nc42 are shown for the bypass iron core control coil.
Similarly, a bypass iron core control coil is wound around the lower yokes 53 and 54.

(Function and effect)
The principle of operation is the same as that of the ninth embodiment, but the symmetry of the arrangement of the three phases is better than that of the ninth embodiment (FIG. 9), and balanced characteristics with less distortion are provided. it can.
Furthermore, since the total of the three phases requires only three legs of the main iron core and four yoke parts of the main iron core, it is possible to reduce the cost and size.

  A three-phase voltage regulating transformer according to the fourteenth embodiment will be described with reference to FIG.

(Construction)
In the present embodiment, that is, three sets of single-phase voltage regulating transformers according to the sixth embodiment are arranged in a triangular shape, and are composed of winding cores above and below the bypass cores 31, 33, 35 made of laminated cores. The annular yokes 51 and 53 are butt jointed.
For the sake of simplicity, only the members for the first phase are shown in the figure, and for the second and third phases, the first main iron cores 23 and 25 and the bypass iron cores 33 and 35 are shown only in the top view (A). showed that.

  Although the outlines of the yokes 51 and 53 in the plane direction are generally annular, the portion of the rectangular outline in contact with the bypass iron core is a parallel straight line, and the portion between the bypass iron cores is an arc. Also called.

(Function and effect)
The principle of operation is equivalent to the case where there is a return path in a corresponding single-phase voltage regulating transformer, for example, the bypass core in Example 6 above, but unlike the case where three sets of the return cores are juxtaposed, the individual return paths of the bypass cores Can be saved, so it can be made cheaper and smaller.
The principle of operation is the same as that of the twelfth embodiment, but unlike the twelfth embodiment, there are six wound iron cores that do not require joint work and can be batch-machined (common to the bypass iron core). If two yokes are added, a total of 8) and three bypass iron cores need only be prepared, so that the two-part structure of the main iron core is further simplified and manufacturing is facilitated.

  A three-phase voltage regulating transformer according to the fifteenth embodiment will be described with reference to FIG.

(Construction)
Two annular common yokes 51, 52, 53, and 54 (not shown) each including two wound cores are attached to the laminated bypass iron cores 31, 33, and 35 in the fourteenth embodiment. (But joint). Furthermore, bypass iron core control coils Nc41 and Nc42, Nc43 and Nc44, Nc45 and Nc46 (not shown) are connected in series to the yokes 51 and 52 and in opposite directions to each other at three locations of the upper yokes 51 and 52 of the bypass iron core. It is rolled up.

For simplicity, only Nc41 and Nc42 are shown for the bypass iron core control coil.
Similarly, a bypass iron core control coil is wound around the lower yokes 53 and 54.

(Function and effect)
The principle of operation is the same as that of a corresponding single-phase voltage regulating transformer, for example, Example 7 (FIG. 7). However, unlike the case where three sets are arranged side by side, the individual return path of the bypass iron core can be omitted. It is cheap and can be downsized.
The principle of operation is the same as that of the thirteenth embodiment, but unlike the thirteenth embodiment, there are six wound iron cores that do not require joint work and can be batch-machined (common to the bypass iron core). When four yokes are added, a total of 10) and six bypass iron cores only need to be prepared. Therefore, the two-part structure of the main iron core and the bypass iron core is further simplified, and manufacturing is facilitated.

In the above-described Examples 10 to 15, the main iron core and / or the bypass iron core are provided with “annular” yokes. Specifically, the “annular” is, as shown in each top view, The joint portion with the leg portion has a parallel line shape, and the portion between the leg portions has a concentric circular shape.
However, the “annular” yoke includes other shapes, for example, in order to save the iron core material of the yoke, the portion between the legs is also substantially parallel to form a “muscle shape” as a whole. Alternatively, for example, the entire yoke can be concentric “circular” to simplify the processing of the yoke.

  The voltage regulating transformer according to the present invention can be used as a variable reactor if the bypass iron core is removed and the secondary coil is removed.

  In recent years, distributed power sources such as wind power generation and solar power generation have increased, and there is a concern about deterioration in power quality of system frequency and system voltage caused by fluctuations in the system linkage power. As one of the measures for stabilizing the power quality, a transformer capable of continuous voltage control at high speed to compensate for power fluctuation is essential. It has been difficult to supply this required performance at a low cost while ensuring high reliability for a large electric power with a conventional step voltage switching system using a mechanical tap or a static transformer using a semiconductor. The magnetic flux control type transformer according to the present invention meets this requirement for the first time in practical use.

It is an equivalent circuit diagram explaining the voltage regulation transformer by a prior art. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the voltage adjustment transformer (single phase) based on 1st Example by this invention, (A) is an equivalent circuit schematic, (B) is a top view, (C) is an elevation view. . It is a figure explaining the voltage adjustment transformer (single phase) which concerns on the 2nd, 3rd Example by this invention, (A) is a circuit diagram, (B) is a top view, (C) is an elevation view It is. FIG. 6 is an equivalent circuit diagram for explaining a (single-phase) voltage regulating transformer according to a fourth embodiment of the present invention. FIG. 6 is an equivalent circuit diagram for explaining a (single-phase) voltage regulating transformer according to a fifth embodiment of the present invention. It is a figure explaining the voltage regulation transformer (single phase) concerning the 6th example by the present invention, (A) is a top view and (B) is an elevation. It is a figure explaining the voltage regulation transformer (single phase) concerning the 7th example by the present invention, (A) is a top view and (B) is an elevation. It is a figure explaining the voltage regulation transformer (3 phase) which concerns on the 8th Example by this invention, (A) is a top view, (B) is an elevation view. It is a figure explaining the voltage regulation transformer (3 phase) which concerns on the 9th Example by this invention, (A) is a top view, (B) is an elevation view. It is a figure explaining the voltage regulation transformer (3 phase) which concerns on 10th Example by this invention, (A) is a top view, (B) is an elevation. It is a figure explaining the voltage regulation transformer (3 phase) which concerns on the 11th Example by this invention, (A) is a top view, (B) is an elevation view. It is a figure explaining the voltage regulation transformer (3 phase) based on the 12th Example by this invention, (A) is a top view, (B) is an elevation. It is a figure explaining the voltage regulation transformer (three phases) based on the 13th Example by this invention, (A) is a top view, (B) is an elevation. It is a figure explaining the voltage regulation transformer (three phases) based on the 14th Example by this invention, (A) is a top view, (B) is an elevation. It is a figure explaining the voltage regulation transformer (three phases) based on the 15th Example by this invention, (A) is a top view, (B) is an elevation view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Iron core which makes a closed magnetic circuit 11a Opening part 11b, 11c Iron core of 2 legs 21, 23, 25 1st iron core (main iron core)
22, 24, 26 Second iron core (main iron core)
30 Third iron core (bypass iron core)
30a, 30b, 30c, 30d 4 sides of bypass core 31, 32, 33, 34, 35, 36 Bypass core 41, 42 Upper yoke 43, 44 Lower yoke 51, 52 Bypass core upper yoke 53, 54 Bypass core lower Yoke N1, N2 Primary coil, secondary coil set N11, N21; N12, N22; N13, N23 Primary coil, secondary coil set Nc1, Nc2 Control coil set Nc11, Nc21; Nc12, Nc22; Nc13, Nc23 Control coil set Nc14, Nc24; Nc15, Nc25; Nc16, Nc26 Control coil set Nc3, Nc4 Bypass iron core control coil set Nc41, Nc42; Nc43, Nc44; Nc45, Nc46 Bypass iron core control coil set

Claims (15)

  First and second iron cores forming a closed magnetic circuit, a primary coil wound so as to surround the first and second iron cores, and a secondary wound so as to surround the first and second iron cores A voltage regulating transformer comprising: a coil; and a control coil wound around the first and second iron cores in series or in parallel and in opposite directions.   First and second iron cores forming a closed magnetic path, a third iron core (hereinafter referred to as a bypass iron core), and a primary coil wound so as to surround the first and second iron cores and the bypass iron core, A secondary coil wound around the first and second iron cores, and a control coil wound around the first and second iron cores in series or in parallel and in opposite directions. Voltage regulation transformer characterized by.   The voltage regulation transformer according to claim 2, wherein the bypass iron core includes an open magnetic circuit.   4. The bypass core control coil according to claim 2, wherein the bypass iron core further includes two iron cores, and includes a bypass iron core control coil wound around the two iron cores in series or in parallel and in opposite directions to each other. 5. Voltage regulation transformer.   The first and second iron cores include a common leg portion and a yoke portion obtained by dividing one or both of the upper and lower yoke portions, and the control coil is divided into the first and second iron cores. 5. The voltage regulating transformer according to claim 1, wherein the voltage regulating transformer is wound around a yoke portion.   5. The voltage regulating transformer according to claim 1, wherein the first and second iron cores are wound iron cores.   7. The voltage regulating transformer according to claim 1, wherein the control coil is wound at a position farthest from the primary and secondary coils.   It consists of three sets of voltage regulating transformers corresponding to each phase voltage of the three-phase AC power, and each of the voltage regulating transformers includes a first iron core, a second iron core, and a third iron core (hereinafter referred to as a closed magnetic circuit). A bypass iron core), a primary coil wound around the first and second iron cores and the bypass iron core, and a secondary coil wound around the first and second iron cores; The first and second iron cores include control coils wound in series or in parallel and in opposite directions, and the bypass iron core has a separate leg corresponding to each of three phases, A voltage regulating transformer having a return path composed of a yoke portion.   One or both of the leg portions or the common yoke portion corresponding to each of the three phases of the bypass iron core are composed of two iron cores, and are wound around the two iron cores in series or in parallel and in opposite directions to each other. 9. The voltage regulating transformer according to claim 8, further comprising a bypass iron core control coil.   A main iron core composed of three legs arranged in a triangular shape corresponding to each phase voltage of the three-phase AC power, a primary coil and a secondary coil respectively wound around the main iron core, and the main iron core Two or more yoke parts (including a case of a circle or a “diaper shape”) provided on both the upper and lower sides and the iron cores of the two yoke parts are connected in series or in parallel and opposite to each other. A voltage regulating transformer comprising a control coil wound in a direction.   A main core composed of three legs arranged in a triangular shape corresponding to each phase voltage of the three-phase AC power, two annular yoke portions provided on either or both sides of the main iron core, and the two The iron core of the yoke part includes a control coil wound in series or in parallel and in opposite directions, and a bypass iron core consisting of three legs juxtaposed on the main iron core consisting of the three legs, so as to surround the main iron core. Each of the secondary coils is wound with a primary coil so as to surround the main iron core and the parallel bypass iron core.   The voltage regulating transformer according to claim 11, wherein the bypass iron core composed of the three legs further has an annular common yoke portion provided on both or one of the upper and lower sides thereof.   The annular common yoke portion of the bypass iron core further comprises two iron cores, and includes a bypass iron core control coil wound around the two iron cores in series or in parallel and in opposite directions. 12. The voltage regulating transformer according to 12.   It consists of three sets of voltage regulation transformers corresponding to each phase voltage of three-phase AC power, and each said voltage regulation transformer is juxtaposed on one of the main iron core consisting of two wound iron cores and the vertical side of the main iron core Bypass iron core, the two wound cores, the primary coil wound around the bypass core, the secondary coil wound around the two wound cores, and the primary and secondary coils of the two wound cores And a control coil wound in series or in parallel and in opposite directions to each other, and the bypass iron core is provided with a ring-shaped common yoke portion provided on both of the upper and lower sides or one of them. The voltage regulation transformer characterized by the above-mentioned. The common yoke portion of the bypass iron core further includes two iron cores, and includes a bypass iron core control coil wound around the two iron cores in series or in parallel and in opposite directions to each other. The voltage regulation transformer described.

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