JP6210871B2 - Power circuit - Google Patents

Description

  The present invention relates to a power supply circuit using a Scott connection transformer.

  When controlling the output voltage of the main transformer and the output voltage of the T seat transformer in the power supply apparatus using the Scott connection transformer composed of the main transformer and the T seat transformer, 1 of the Scott connection transformer is used. It is conceivable to provide a control element for controlling the voltage or current in each of the three phases on the next side.

  However, since the current flowing through the primary coil of the T-sink transformer flows into the primary coil of the main transformer, even if a control element is provided for each of the three phases on the primary side of the Scott connection transformer, The output voltage of the circuit cannot be individually controlled.

  From the above, it is general to provide a control element for controlling the voltage or current in each of the two single-phase circuits and individually control the output voltages of the two single-phase circuits.

  However, when the load connected to the single-phase circuit has a low resistance, the single-phase circuit becomes a large current circuit, and it is practically difficult to provide a control element in the large current circuit. Therefore, as shown in FIG. 6, control elements are provided in two single-phase circuits using Scott connection transformers, and two types of single-phase transformers that convert the outputs of the two single-phase circuits into low-voltage and large currents are provided. It is done to make a configuration. That is, this method requires a total of three transformers, one Scott connection transformer and two single-phase transformers.

JP 61-248508 A

  Therefore, the present invention has been made to solve the above problems, and in the power supply device using the Scott connection transformer, the device configuration can be simplified and the circuit characteristics of the Scott connection transformer can be utilized. On the other hand, the main problem is to individually control the output voltage of the main transformer and the output voltage of the T transformer.

  That is, the power supply device according to the present invention is a power supply circuit having a Scott connection transformer composed of a main transformer and a T seat transformer, provided in one of the two phases on the input side of the main transformer, A first control device for controlling voltage or current; and a second control device for controlling voltage or current provided on one end side of a primary coil that is an input side of the T seat transformer. When the number of turns of the secondary coil of the transformer is n1, the number of turns of the secondary coil of the T seat transformer is n2, and the coefficient obtained from the excitation impedance of the main transformer and the excitation impedance of the T seat transformer is k. The first control device and the second control device in a state where the output voltage of the main transformer is connected to a load that requires a voltage of k × n1 / n2 or more with respect to the output voltage of the T-slot transformer. Is the output voltage of the main transformer and the T The output voltage of the transformer and controls separately.

  In addition, the method of using the power supply device according to the present invention includes a Scott connection transformer including a main transformer and a T seat transformer, and voltage or current is applied to one of two phases on the input side of the main transformer. A first control device for controlling the power supply, and a method for using the power supply apparatus in which a second control device for controlling voltage or current is provided on one end side of the primary coil which is the input side of the T-seat transformer. The number of turns of the secondary coil of the main transformer is n1, the number of turns of the secondary coil of the T transformer is n2, and the coefficient obtained from the excitation impedance of the main transformer and the excitation impedance of the T transformer is k, when the output voltage of the main transformer is connected to a load that requires a voltage greater than or equal to k × n1 / n2 with respect to the output voltage of the T-transformer, Output of the main transformer by the second control device And controlling the output voltage of the the pressure T seat transformer separately.

  Here, the primary coil of the T seat transformer is connected to the center point of the primary coil of the main transformer, and current flows from the primary coil of the T seat transformer to the primary coil of the main transformer. Even if the first control device of the main transformer is reduced to the minimum, the output voltage of the main transformer remains at a predetermined ratio with respect to the output voltage of the T-seater transformer. Here, the number of turns of the secondary coil of the main transformer is n1, the number of turns of the secondary coil of the T seat transformer is n2, and the coefficient obtained from the excitation impedance of the main transformer and the excitation impedance of the T seat transformer is k. In this case, the main transformer output voltage is (k × n1 / n2) times the T seat transformer output voltage. The excitation impedance is determined by the length of the magnetic path, the magnetic flux density, the gap length, the number of turns, and the like. Specifically, the coefficient k is obtained by the ratio between the excitation impedance of the T-seat transformer when the first control device is shut off and the excitation impedance when the number of turns of the primary coil of the main transformer is halved.

  Therefore, if the output voltage of the main transformer is connected to a load that requires a voltage of k × n1 / n2 or more with respect to the output voltage of the T-transformer, 2 on the input side of the main transformer. The output voltage of the main transformer and the output voltage of the T seat transformer are individually controlled by the first control device provided on one of the phases and the second control device provided on the input side of the T seat transformer. be able to. In addition, since it is not necessary to provide two single-phase transformers on the output side of the main transformer and the T-seater transformer as in the prior art, the apparatus configuration can be simplified.

It is desirable that the number of turns of the secondary coil of the main transformer and the number of turns of the secondary coil of the T seat transformer are the same.
At this time, if k = 0.66 as an embodiment, the output voltage of the main transformer is connected to a load that requires a voltage of 0.66 or more with respect to the output voltage of the T-transformer. If the load impedance connected to the single-phase output circuit (secondary coil) of the main transformer is the same as the load impedance connected to the single-phase output circuit (secondary coil) of the T-seat transformer The load capacity of the single-phase output circuit of the main transformer is to be 0.44 (≈0.66 ² ) or more with respect to the load capacity of the single-phase output circuit of the T-seat transformer.

It is desirable that at least one of the main seat transformer or the T seat transformer is an autotransformer.
In this way, the primary coil and the second coil are connected in a single winding, so that the insulation between the primary coil and the secondary coil can be simplified, making it easier to manufacture and reducing the risk of an accident occurring. be able to.

The iron core of the main transformer and the iron core of the T seat transformer are preferably integrally formed.
If it is this, the transformer which comprises a Scott connection transformer can be changed from 2 sets to 1, and an apparatus can be made compact.

It is desirable that at least one of the main seat transformer or the T seat transformer has a leg iron core having a substantially circular cross section and a yoke core composed of a deformed wound core connected above and below the leg iron core. Here, as the leg iron core having a substantially circular cross section, a cylindrical involute core formed by cylindrically laminating a large number of magnetic steel plates each having a curved portion curved in an involute shape may be considered.
In this case, since the leg iron core has a substantially circular cross section, the outer peripheral length becomes the shortest when the cross-sectional area is the same as that of the square iron core, and the amount of coil used can be reduced. Further, since the yoke core is a deformed wound core, it is easy to make the abutting portion with the leg core having a substantially circular cross section in the same circle.

The Scott connection transformer includes two main leg cores around which a Scott-connected induction coil is wound, a common leg core serving as a common passage for magnetic flux generated in the two main leg cores, and the two main legs. An iron core and a yoke core connecting the upper and lower sides of the common leg iron core, and the two main leg iron cores and the common leg iron core are arranged so that each is located at the apex of a triangle in plan view, However, it is preferable that the common leg iron core is bent at the refraction point in plan view.
In this case, the two main leg iron cores and the common leg iron cores are arranged so that each is located at the apex of the triangle in plan view, and the yoke core is bent at the common leg iron core in plan view. Therefore, the distance between the two main leg iron cores can be reduced to reduce the dimension in the width direction of the entire iron core, thereby saving space.

It is desirable that a distance between one of the two main leg iron cores and the common leg iron core is equal to a distance between the other of the two main leg iron cores and the common leg iron core.
In this case, the magnetic path length between the one main leg iron core and the common leg iron core is equal to the magnetic path length between the other main leg iron core and the common leg iron core. The magnetic properties of the leg iron cores are equivalent to each other, and the three-phase power source can be efficiently converted into two single-phase circuits.

  According to the present invention configured as described above, in the power supply apparatus using the Scott connection transformer, the apparatus configuration can be simplified and each transformer when the control device is provided on the input side of the Scott connection transformer. It is possible to individually control the output voltage of the main transformer and the output voltage of the T-seat transformer while utilizing the output characteristics of the transformer.

The figure which shows typically the structure of the superheated steam generator which concerns on this embodiment. The top view and front view which show typically the structure of the Scott connection transformer of the same embodiment. The figure which shows the test apparatus of a circuit equivalent to a superheated steam generator. The characteristic graph which shows the relationship between the calorie | heat amount which generate | occur | produces superheated steam, and superheated steam temperature. The top view which shows typically the structure of the Scott connection transformer of deformation | transformation embodiment. The schematic diagram which shows the structure of the conventional superheated steam generator.

  Hereinafter, an embodiment of a superheated steam generator using a power supply device according to the present invention will be described with reference to the drawings.

  The superheated steam generator 100 according to the present embodiment generates heated steam by energizing and heating a heated conductor tube in which a fluid flows. As shown in FIG. A power supply device 200 having a Scott connection transformer 2 that converts alternating current into two single-phase alternating currents; a first heating conductor tube 3 and a second heating conductor tube 4 that are energized and heated by the two-phase alternating current of the Scott connection transformer 2; It has.

  The Scott connection transformer 2 comprises a main seat transformer 2M and a T seat transformer 2T. Further, the iron core of the main transformer 2M and the iron core of the T seat transformer 2T according to the present embodiment are integrally formed.

  The first heating conductor tube 3 is connected to the output side of the main transformer 2M of the Scott connection transformer 2, and is heated by being energized by applying the output voltage of the main transformer 2M. 3p1 and fluid outlet port 3p2. Then, water is introduced from the fluid introduction port 3p1, and saturated water vapor is derived from the fluid outlet port 3p2.

  The second heating conductor tube 4 is connected to the output side of the T seat transformer 2T of the Scott connection transformer 2, and is heated by being energized by applying the output voltage of the T seat transformer 2T. 4p1 and a fluid outlet port 4p2. Then, saturated steam generated by the first heating conductor tube 3 is introduced from the fluid introduction port 4p1, and superheated steam heated to a predetermined temperature is led out from the fluid lead-out port 4p2. In FIG. 1, the fluid introduction port 4p1 of the second heating pipe 4 is connected to the fluid outlet port of the first heating conductor pipe 3 via an intermediate connection pipe 7 made of an insulating material.

  As shown in FIG. 2, the Scott connection transformer 2 of the present embodiment includes a primary winding (hereinafter referred to as “primary primary coil 2a”) and a secondary winding (hereinafter referred to as “main seat”) of the main transformer 2M. The first main leg core (the main seat leg core 21) around which the secondary coil 2b) is wound, the primary winding (hereinafter referred to as the T seat primary coil 2c) and the secondary winding of the T seat transformer 2T. (Hereinafter referred to as a T-seat secondary coil 2d) a second main leg iron core (T-seat leg iron core 22) and a common leg serving as a common path for magnetic flux generated in the two main leg iron cores 21 and 22. An iron core 23 and a yoke core 24 that connects the upper and lower sides of the two main leg iron cores 21 and 22 and the common leg iron core 23 are provided.

  Two phases (for example, V phase and W phase) of the three phases (U phase, V phase, and W phase) are connected to both ends of the main seat primary coil 2a. One end of the T seat primary coil 2c is connected to the midpoint of the main seat primary coil 2a, and the other end of the T seat primary coil 2c is connected to the main seat primary coil 2a in the three phases. The remaining one phase (for example, U phase) that is not connected is connected. Specifically, the number of turns of the T seat primary coil 2c is (√3 / 2) N with respect to the even number of turns N of the main seat primary coil 2a, and one end of the T seat primary coil 2c is mainly used. It is comprised so that it may connect with the position of N / 2 of the seat primary coil 2a.

The main seat leg iron core 21, the T seat leg iron core 22, and the common leg iron core 23 are involutes having a substantially circular cross section formed in a cylindrical shape by laminating a large number of magnetic steel plates each having a curved portion curved in an involute shape. It is composed of an iron core. The main seat leg core 21 and the T seat leg core 22 are of the same size, and the cross sectional area S1 of the main seat leg core 21 and the cross sectional area S2 of the T seat leg core 22 are equal to each other. The cross-sectional area of the common leg core 23 is √2 times the cross-sectional areas S1 and S2 of the main seat leg core 21 and the T seat leg core 22. Specifically, as shown in FIG. 2, the diameter of the common leg core 23 is (√2) ^0.5 d, where d is the diameter of the main seat leg core and the T seat leg core.

  Further, the main leg core 21, the T leg core 22, and the common leg core 23 are arranged so that each is located at the apex of the triangle when the Scott connection transformer 2 is viewed from above. In the present embodiment, in plan view, a line connecting the center of the main leg core 21 and the center of the common leg core 23 and a line connecting the center of the T leg core 22 and the center of the common leg core 23 are formed. The angle is configured to be about 120 degrees. The center distance L1 between the main leg core 41 and the common leg core 43 is equal to the center distance L2 between the T seat leg core 42 and the common leg core 43. That is, the main leg core 41, the T leg core 42, and the common leg core 43 are arranged so that each is located at the apex of an isosceles triangle in plan view.

  The yoke core 24 is composed of a deformed wound iron core, and has an upper iron core 24a that connects the upper surfaces of the main leg core 21, the T leg core 22 and the common leg iron core 23, the main leg core 21, and the T seat. The leg iron core 22 and the common leg iron core 23 are composed of a lower iron core 24b that connects the lower surfaces of each other. The upper iron core 24a and the lower iron core 24b are bent with the common leg iron core 23 as a refraction point in plan view. Each of the yoke cores 24a, 24b of the present embodiment is bent in a dogleg shape with the center of the common leg core 23 as a bending point. Specifically, the bending angle of the upper core 44a and the lower core 44b is configured to be 120 degrees.

  According to the Scott transformer core 100 configured in this manner, the main leg cores 21 and 22 and the common leg core 23 are arranged so that each is located at the apex of the triangle in plan view, and the yoke core 24 is In the plan view, the common leg iron core 23 is bent into a U-shape, so that the distance between the main leg iron cores 21 and 22 is reduced to reduce the overall width of the iron core to save space. Can do.

  Therefore, as shown in FIG. 1, the power supply device 200 of the present embodiment is provided with the first control device 5 that controls the voltage or current in one of the two phases on the input side of the main transformer 2M. . In FIG. 1, a semiconductor control element such as a thyristor as the first control device 5 is provided in the V phase on the input side of the main transformer 2M. Moreover, the 2nd control apparatus 6 which controls a voltage or an electric current at the one end side (the U phase side or the middle point O side of the T seat primary coil 2c) of the primary coil 2c which is the input side of the T seat transformer 2T. Is provided. Similarly to the first control device 5, the second control device 6 uses a semiconductor control element such as a thyristor. Then, a control device (not shown) controls the first control device 5 and the second control device 6 using the temperature of the first heating conductor tube 3 and the temperature of the second heating conductor tube 4, so that the main transformer The device 2M is configured to individually control the output voltage applied to the first heating conductor tube 3 and the output voltage applied to the second heating conductor tube 4 by the T seat transformer 2T. The control device acquires the temperature of the first heating conductor tube 3 from a temperature sensor provided in the first heating conductor tube 3, and provides the temperature of the second heating conductor tube 4 in the second heating conductor tube 4. Obtain from temperature sensor.

  The power supply device 200 configured as described above includes the number of turns n1 of the main seat secondary coil 2b, the number of turns n2 of the T seat secondary coil 2d, the excitation impedance of the main transformer 2M, and the excitation impedance of the T seat transformer 2T. When the obtained coefficient is k, the output voltage of the main transformer 2M is connected to a load that always requires a voltage of k × n1 / n2 or more with respect to the output voltage of the T seat transformer 2T. The control device 5 and the second control device 6 are configured to individually control the output voltage of the main transformer 2M and the output voltage of the T seat transformer 2T.

  In the present embodiment, the first control device 5 is provided in one of the two phases on the input side of the main transformer 2M to control the output voltage of the main transformer 2M applied to the first heating conductor tube 3. To generate saturated water vapor. Since both ends of the primary coil 2a of the main transformer 2M are connected to the power supply 8, the output voltage of the main transformer 2M has a value corresponding to the turn ratio.

  However, the primary coil 2c of the T seat transformer 2T is connected to the center point of the primary coil 2a of the main transformer 2M, and the primary coil 2c of the T seat transformer 2T to the primary coil of the main transformer 2M. Since the current flows into 2a, even if the first control device 5 of the main transformer 2M is reduced to the minimum (even if the V phase is cut off), the output voltage of the main transformer 2M is the same as that of the T seat transformer 2T. For the output voltage, k × n1 / n2 (maximum of about 66%) remains. Here, since the ratio of the saturated steam generation heat amount and the superheated steam generation heat amount when the superheated steam temperature is set to 2000 ° C. is 1.0: 1.79, the single-phase circuit in which the first heating conductor tube 3 is provided. The current ratio between the (saturated steam generation side single phase circuit) and the single phase circuit (superheated steam generation side single phase) provided with the second heating conductor tube 4 is 0.75: 1.0, and the residual amount is It doesn't matter. Of course, when the superheated steam temperature is less than 2000 ° C., the ratio of the current required for generating saturated steam becomes large, so the residual content is not a problem. Moreover, since the superheated steam cannot be separated into hydrogen and oxygen and cannot exist as superheated steam at a temperature higher than 2000 ° C., the residual current value is not in a region where it becomes a problem.

  Although the output voltage of the T-seat transformer 2T is controlled by the second control device 6 of the T-seat transformer 2T, the current flowing into the main seat transformer 2M is not controlled even if the first control device 5 is cut off. Since the current flows in the other phase where 5 is not provided, the current is not controlled. Further, the output voltage of the T seat transformer 2T varies depending on the first control device 5 of the main transformer 2M, but current control based on the temperature of the second heating conductor tube 4 (heating tube for generating superheated steam) is performed. So there is no problem.

  Furthermore, as a method of using the superheated steam generator 100, first, the amount of superheated steam generated is set. If the amount of superheated steam is determined, the amount of heat required for saturated steam set at a temperature of 130 ° C. is always constant. The output voltage of the main transformer 2M does not fluctuate so as to affect the output voltage of the T seat transformer 2T.

  In addition, the output voltage of the main transformer 2M is roughly controlled to a value that does not fluctuate greatly, and even if the saturated water vapor temperature slightly fluctuates around 130 ° C., the superheated water vapor temperature can be Since the second control device 6 of the T-seat transformer 2T controls in detail based on the temperature of the steam generating heating pipe), there is no problem in controlling the superheated steam temperature.

  Next, test results using a test apparatus having a circuit equivalent to that of the superheated steam generator 100 shown in FIG. 3 will be described. The number of turns of the main seat primary coil 2a is 44, the number of turns of the T seat primary coil 2c is 38, and the number of turns n1, n2 of the secondary coils 2b, 2d of each transformer 2M, 2T is It was set to 22.

  Table 1 below shows the voltage and current of each part when the first control device 5 blocks the V phase and the second control device 6 changes the input voltage (Eu-w (V)).

Here, in this test, since the secondary winding resistance of the transformer is as high as 0.16Ω for both the a-Oa circuit and the b-Ob circuit, the output voltage decreases and an output voltage corresponding to the turns ratio is output. Not. When the voltage drop due to the secondary winding resistance is corrected, Eu-o (V), Eo-w (V), the output voltage of the T-seat transformer (Ea-o _a (V)) and the output of the main transformer voltage _{(Eb-o b (V)} ) becomes as shown in Table 2 below.

  As shown in Table 2, when the first control device 5 shuts off the V phase and the second control device 6 changes Eu-w (V), the output voltage of the T-seat transformer 2T is Thus, it can be seen that the output voltage of the main transformer 2M remains about 66%.

  Here, looking at the term of Eu−w = 158 (V) in Table 1, the shared voltages between u−o and o−w in the primary coil are 114.4 (V) and 43. 1 (V), which is not a share of the ratio of 38T and 22T which is the turn ratio. This is because, although the core of the main transformer 2M and the iron core of the T seat transformer 2T are integrally formed and have a common leg iron core, the magnetic circuit is configured separately, so the shared voltage per 1T is the same. It is because it is not. Eu-w (V) is shared by the ratio of the respective excitation impedances, and the excitation impedance is determined by the length of the magnetic path, the magnetic flux density, the gap length, the number of turns, and the like. That is, the ratio of the residual voltage of the output voltage of the main transformer 2M to the output voltage of the T seat transformer 2T is half the number of turns of the main coil 2a of the main transformer 2M with respect to the excitation impedance of the T seat transformer 2T. Is the ratio of the excitation impedance.

Next, in Table 3 below, the control current is kept constant by the second control device 6 (EU _−W (V) ≈158 (V)), and the input voltage of the main transformer 2M by the first control device 5 The voltage and electric current of each part at the time of changing ( _EVW (V)) are shown.

As shown in Table 3, by changing the input voltage (E _V-W (V)) of the main transformer 2M by about 1.8 times by the first control device 5, the output voltage of the T seat transformer 2T The result shows that (Ea-o _a (V)) fluctuates by about 18%.

Next, in Table 4 below, the control current is kept constant by the first control device 5 (E _V−W (V) ≈158 (V)), and the input voltage (E _U−W ( V)) shows the voltage and current of each part when changed.

As shown in Table 4, the output voltage (Eb-o _b (V)) of the main transformer 2M is not affected by the change in the output voltage (Ea-o _a (V)) of the T-seat transformer 2T. It is the result.

Next, in Table 5 below, the input voltage (2M) of the main transformer 2M is controlled by the first control device 5 while the U-O voltage is kept constant (≈101 (V)) by the second control device 6. E _V−W (V)) is changed, and the voltage and current of each part are shown.

As shown in Table 5, the output voltage (Ea-o _a (V)) of the T-seat transformer 2T is kept constant, and the output voltage (Eb-o _b (V)) of the main transformer 2M is The result is controlled.

  Here, a characteristic graph showing the relationship between the amount of heat for generating superheated steam and the temperature of the superheated steam when the amount of heat for generating saturated steam is 1 is shown in FIG.

  When the superheated steam temperature is 200 ° C., 0.059, when the superheated steam temperature is 748 ° C., 0.5, when the superheated steam temperature is 1279 ° C., 1.0, when the superheated steam temperature is 1752 ° C., 1. 5. When the superheated steam temperature is 2000 ° C., it is 1.79.

  The relationship between the superheated steam temperature and the current value of each phase of the three-phase AC power supply is shown in Table 6 below.

  As can be seen from Table 6, at the superheated steam temperature of 1279 ° C., the current ratio of each phase is balanced at 1: 1: 1, and at 2000 degrees, the current ratio of each phase is 1.223: 1: 1, At 748 ° C., the current ratio of each phase is 0.756: 1: 1, and at 200 ° C., the current ratio of each phase is 0.278: 1: 1. Therefore, in the range from the lowest temperature of 200 ° C., called superheated steam, to the extreme temperature of 2000 ° C., there is no extreme current imbalance such that the current value of one phase becomes zero.

  According to the superheated steam generator 100 of the present embodiment configured as described above, the first heating conductor tube 3 (saturated steam generating heating tube) is connected to the output of the main transformer 2M, and the T seat transformer 2T By connecting the second heating conductor pipe 4 (heating pipe for generating superheated steam) to the output, the output voltage of the main transformer becomes a voltage of k × n1 / n2 or more with respect to the output voltage of the T seat transformer. The required load is connected, and in this state, the first control device 5 provided on one of the two phases on the input side of the main transformer 2M and the second control provided on the input side of the T seat transformer 2T The device 6 can individually control the output voltage of the main transformer 2M and the output voltage of the T seat transformer 2T. Thereby, control of superheated steam temperature can be performed easily, making use of the characteristic of the power supply circuit 200 which has the Scott connection transformer 2. FIG. Moreover, since it is not necessary to provide two single-phase transformers on the output side of the main seat transformer 2M and the T seat transformer 2T as in the prior art, the apparatus configuration can be simplified.

  Also, the iron core of the main seat transformer 2M and the iron core of the T seat transformer 2T are integrally formed, and the main seat leg iron core 21, the T seat leg iron core 22, and the common leg iron core 23 are respectively triangular in plan view. Since the yoke core 24 is bent with the common leg core 23 as a refracting point in a plan view, the distance between the two main leg cores 21 and 22 is reduced, and the Scott connection transformer The size of the entire container 2 in the width direction can be reduced, and space can be saved. Moreover, the transformer which comprises the Scott connection transformer 2 can be changed from 2 sets to 1 set, and a device can be made compact.

  The present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the first heating conductor tube 3 and the second heating conductor tube 4 are connected to the secondary coils 2b and 2d of the transformers 2M and 2T and are energized and heated. The secondary coils 2b and 2d of the transformers 2M and 2T may be formed of a hollow conductor tube, and each of the heating conductor tubes 3 and 4 may be constituted by the secondary coils 2b and 2d. In addition, either the secondary coil of the main transformer 2M or the T-sheath transformer 2T is formed of a hollow conductor tube, and either the first heating conductor tube 3 or the second heating conductor tube 4 is a secondary coil. It may be constituted by. Thereby, the electrical connection between the secondary coil of the transformers 2M and 2T and the heating conductor tube is eliminated, and the efficient superheated steam generator 100 can be configured. In particular, it is efficient if the first heating conductor tube on the low temperature side is constituted by a secondary coil made of a hollow conductor tube.

  Further, in at least one of the main transformer 2M or the T transformer 2T, the primary coil may be wound around the leg iron core so as to overlap the inner side and the outer side of the secondary coil. Thereby, it becomes the structure by which a secondary coil is pinched | interposed between primary coils, a leakage magnetic flux can be reduced, and equipment efficiency can be raised.

  Furthermore, it is good also as a structure which preheats the water which flows in into the 1st heating conductor pipe | tube 3 by comprising a primary coil from a hollow conductor pipe | tube. Thereby, resistance heat generated in the hollow conductor tube constituting the primary coil and heat of the iron core can be given to the water, and the equipment efficiency can be improved.

  In addition, in the above-described embodiment, the iron core of the main transformer 2M and the iron core of the T seat transformer 2T are integrally formed. However, the iron core of the main transformer 2M and the iron core of the T seat transformer 2T are separated from each other. It is also good.

  In addition, the main transformer 2M and the T transformer 2T of the above embodiment may be single-turn transformers. If this is the case, the insulation between the primary coil and the secondary coil can be simplified, making it easier to manufacture and reducing the risk of accidents.

  Furthermore, the angle formed by the line connecting the center of the main leg core 21 and the center of the common leg core 23 and the line connecting the center of the T seat core 22 and the center of the common leg core 23 is 120 degrees. For example, as shown in FIG. That is, the main leg iron core 41, the T leg iron core 42, and the common leg iron core 43 are arranged so that each is located at the apex of the right triangle in plan view, and the common leg iron core 43 is the apex of the right triangle. Of these, it may be arranged at a vertex that is a right angle. Specifically, the bending angle of the upper core 44a and the lower core 44b is configured to be 90 degrees. If it is this, the dimension of the width direction of the whole Scott connection transformer can be made smaller than the said embodiment, and space saving can be achieved.

  In addition, in the above embodiment, the distance between the centers of the main leg core 21 and the common leg core 23 and the distance between the centers of the T leg core 22 and the common leg core 23 are different from each other. The center-to-center distance between the seat leg core 21 and the common leg core 23 and the center-to-center distance between the T seat leg core 22 and the common leg core 23 may be equal to each other. That is, the main leg core 21, the T leg core 22, and the common leg core 23 are arranged so that each is located at the apex of an isosceles triangle in plan view, and the yoke cores 24 a and 24 b are common to each other. The shape is symmetrical with respect to the center of the leg core 23. In this case, the magnetic characteristics of the two main leg iron cores 21 and 22 are equal to each other, and the three-phase AC power source can be efficiently converted into two single-phase circuits.

  Moreover, although the said embodiment demonstrated the case where the power supply circuit 200 which has the Scott connection transformer 2 was applied to the superheated steam generator 100, other than that, the output voltage of a main transformer becomes the output voltage of a T seat transformer. On the other hand, as long as the load always requires a voltage of k × n1 / n2 or more, the load is not limited to the load composed of the first heating conductor tube 3 and the second heating conductor tube 4, and various loads can be connected.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Superheated steam generator 200 ... Power supply device 2 ... Scott connection transformer 21 ... Main seat leg core (main leg iron core)
22 ・ ・ ・ T seat leg iron core (main leg iron core)
23 ... common leg core 24 ... yoke core 2M ... main transformer 2a ... primary coil 2b ... secondary coil 2T ... T seat transformer 2c ... primary coil 2d ... secondary coil 3 ... first heating conductor tube 4 ... second heating conductor tube 5 ... first control device 6 ... second control device

Claims (9)

A power supply circuit having a Scott connection transformer comprising a main transformer and a T-seat transformer,
A first control device that is provided in one of the two phases on the input side of the main transformer and controls voltage or current;
A second control device that is provided on one end side of the primary coil that is the input side of the T-seat transformer and controls voltage or current;
The number of turns of the secondary coil of the main transformer is n1, the number of turns of the secondary coil of the T transformer is n2, and a coefficient obtained from the excitation impedance of the main transformer and the excitation impedance of the T transformer is k. When the output voltage of the main transformer is connected to a load that requires a voltage of k × n1 / n2 or more with respect to the output voltage of the T-seat transformer, the first control device and the The second control device individually controls the output voltage of the main seat transformer and the output voltage of the T seat transformer.   The power supply device according to claim 1, wherein the number of turns of the secondary coil of the main transformer and the number of turns of the secondary coil of the T-seat transformer are the same.   3. The power supply device according to claim 1, wherein at least one of the main seat transformer or the T seat transformer is an autotransformer.   4. The power supply device according to claim 1, wherein an iron core of the main transformer and an iron core of the T-transformer are integrally formed. 5.   The at least one of the main seat transformer or the T seat transformer has a leg core having a substantially circular cross section and a yoke core composed of a deformed wound core connected to the top and bottom of the leg core. The power supply device according to any one of the above. The Scott connection transformer is
Two main leg cores around which Scott-connected coils are wound;
A common leg iron core serving as a common path for magnetic flux generated in the two main leg iron cores;
A yoke core connecting the upper and lower sides of the two main leg iron cores and the common leg iron core,
The two main leg iron cores and the common leg iron core are arranged so that each is located at the apex of a triangle in plan view,
The power supply device according to any one of claims 1 to 5, wherein the yoke core is bent with the common leg iron core as a refracting point in plan view.   The power supply device according to claim 6, wherein a distance between one of the two main leg iron cores and the common leg iron core is equal to a distance between the other of the two main leg iron cores and the common leg iron core. The two main leg iron cores and the common leg iron core are arranged so that each is located at the apex of a right triangle in plan view,
8. The power supply device according to claim 6, wherein the common leg iron core is disposed so as to be positioned at a vertex that is a right angle among the vertices of the right triangle. A Scott connection transformer comprising a main transformer and a T transformer is provided, and a first control device for controlling voltage or current is provided in one of the two phases on the input side of the main transformer, and the T A method of using a power supply apparatus in which a second control device for controlling voltage or current is provided on one end side of a primary coil that is an input side of a transformer,
The number of turns of the secondary coil of the main transformer is n1, the number of turns of the secondary coil of the T transformer is n2, and a coefficient obtained from the excitation impedance of the main transformer and the excitation impedance of the T transformer is k. When the output voltage of the main transformer is connected to a load that requires a voltage of k × n1 / n2 or more with respect to the output voltage of the T-seat transformer, the first control device and the A method of using a power supply apparatus, wherein the output voltage of the main transformer and the output voltage of the T-seat transformer are individually controlled by a second control device.