CN114664543A - Phase-shifting transformer with polygonal zigzag connection - Google Patents

Phase-shifting transformer with polygonal zigzag connection Download PDF

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Publication number
CN114664543A
CN114664543A CN202210191362.8A CN202210191362A CN114664543A CN 114664543 A CN114664543 A CN 114664543A CN 202210191362 A CN202210191362 A CN 202210191362A CN 114664543 A CN114664543 A CN 114664543A
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phase
switch
winding
ars
modulation
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李程
范洪涛
杨哲
程玉芳
李文平
张栋
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Baoding Tianwei Baobian Electric Co Ltd
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Baoding Tianwei Baobian Electric Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances

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Abstract

The invention provides a phase-shifting transformer with polygonal zigzag connection, which comprises an excitation winding connected to the three-phase power supply side in a star connection manner, wherein the excitation winding provides excitation for two in-phase-modulation windings. The voltage vector of the phase modulation winding is changed by adjusting the number of turns of the phase modulation winding through a voltage adjusting switch of the linear modulation. After the power supply is introduced into the transformer, the voltage with the same phase is sequentially connected with the phase modulation winding voltages of the other two phases in series, and the voltage with the phase angle changed compared with the power supply and the amplitude unchanged is obtained through vector synthesis of the three-phase voltages and supplied to the load side, so that the function of changing the phase angle of the voltage of the power supply side and the load side and keeping the amplitude constant is realized. The ARS polarity conversion switch is used for changing the polarity of the phase modulation winding and the linear voltage regulating switch is used for selecting different numbers of turns of the phase modulation winding connected in series, so that the phase angle of the voltage at the load side is controlled to be ahead or behind than that at the power supply side and the step-by-step of the phase shift angle is controlled.

Description

Phase-shifting transformer with polygonal zigzag connection
Technical Field
The invention belongs to the technical field of transformers, and particularly relates to a phase-shifting transformer with polygonal zigzag connection.
Background
The high voltage phase shifting transformer can control the power flow distribution of a specific line in a complex power transmission network by changing the phase of the voltage on the power supply side and the load side of the power transmission line. Although the phase-shifting transformer adopting the single-transformer body and the zigzag connection structure has the advantages of simple structure and high reliability, the phase angle is adjusted, the voltage amplitude is changed, the phase-shifting angle is clamped in a smaller range, and the constant voltage amplitude and the large requirement on the phase-shifting angle are required in many application occasions, so that the structure cannot be applied to the application occasions.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a technical solution of a phase shifting transformer with polygonal zigzag connection to solve the above technical problems.
The invention discloses a phase-shifting transformer with polygonal zigzag connection, which comprises,
the device comprises an excitation winding, a phase modulation unit I and a phase modulation unit II;
the transformer is characterized in that an excitation winding, a phase modulation unit I and a phase modulation unit II are sequentially arranged on each core limb of a three-phase structure;
the three-phase winding SA phase excitation winding, the SB phase excitation winding and the SC phase excitation winding of the excitation winding are in star connection, and three input ends are led out to be respectively connected with three phases at a power supply side: SA, SB, SC;
three phases on the load side: LA, LB, LC are led out from the output end of the phase modulation unit II.
In some embodiments, the phase modulation unit I comprises:
a first phase modulation winding, a first ARS switch and a first linear modulation switch;
the first phase modulation winding includes: the phase modulation winding comprises an SA phase first phase modulation winding, an SB phase first phase modulation winding and an SC phase first phase modulation winding;
the first ARS switch includes: the first ARS switch of SA looks, the first ARS switch of SB looks and the first ARS switch of SC looks;
the first linear switch includes: the system comprises an SA phase first linear regulating switch, an SB phase first linear regulating switch and an SC phase first linear regulating switch;
the first end of the SA phase first ARS switch is connected with the output end of the SA phase excitation winding, the second end of the SA phase first ARS switch is connected with the first end of the SA phase first phase modulation winding, the second end of the SA phase first phase modulation winding is connected with the first end of the SA phase first linear modulation switch, and the second end of the SA phase first linear modulation switch is connected with the third end of the SA phase first ARS switch;
the first end of the SB-phase first ARS switch is connected with the output end of the SB-phase excitation winding, the second end of the SB-phase first ARS switch is connected with the first end of the SB-phase first phase modulation winding, the second end of the SB-phase first phase modulation winding is connected with the first end of the SB-phase first linear modulation switch, and the second end of the SB-phase first linear modulation switch is connected with the third end of the SB-phase first ARS switch;
the first end of the SC-phase first ARS switch is connected with the output end of the SC-phase excitation winding, the second end of the SC-phase first ARS switch is connected with the first end of the SC-phase first phase modulation winding, the second end of the SC-phase first phase modulation winding is connected with the first end of the SC-phase first linear modulation switch, and the second end of the SC-phase first linear modulation switch is connected with the third end of the SC-phase first ARS switch.
In some embodiments, the phase modulation unit II comprises:
a second phase modulation winding, a second ARS switch and a second linear modulation switch;
the second phase modulation winding includes: the SA phase second phase modulation winding, the SB phase second phase modulation winding and the SC phase second phase modulation winding;
the second ARS switch includes: the SA phase second ARS switch, the SB phase second ARS switch and the SC phase second ARS switch;
the second linear adjustment switch includes: the SA phase second linear regulating switch, the SB phase second linear regulating switch and the SC phase second linear regulating switch;
the first end of the SA phase second ARS switch is connected with the fourth end of the SA phase first ARS switch, the second end of the SA phase second ARS switch is connected with the first end of the SA phase second phase modulation winding, the second end of the SA phase second phase modulation winding is connected with the first end of the SA phase second linear modulation switch, and the second end of the SA phase second linear modulation switch is connected with the third end of the SA phase second ARS switch;
a first end of the SB phase second ARS switch is connected with a fourth end of the SB phase first ARS switch, a second end of the SB phase second ARS switch is connected with a first end of the SB phase second phase modulation winding, a second end of the SB phase second phase modulation winding is connected with a first end of the SB phase second linear modulation switch, and a second end of the SB phase second linear modulation switch is connected with a third end of the SB phase second ARS switch;
the first end of the SC-phase second ARS switch is connected with the fourth end of the SC-phase first ARS switch, the second end of the SC-phase second ARS switch is connected with the first end of the SC-phase second phase modulation winding, the second end of the SC-phase second phase modulation winding is connected with the first end of the SC-phase second linear modulation switch, and the second end of the SC-phase second linear modulation switch is connected with the third end of the SV-phase second ARS switch.
In some embodiments, the first phase modulation winding is wound by multiple stages of wire having different numbers of turns.
In some embodiments, the second phase modulation winding is wound around multiple stages of wire having different numbers of turns.
In some embodiments, the load side voltage phase angle is controlled to lead or lag the power supply side voltage by cooperation of the first ARS switch, the second ARS switch, the first linearly regulated switch, and the second linearly regulated switch.
In some embodiments, the relationship between the number of turns in the first phase modulation winding and the second phase modulation winding and the number of turns in the excitation winding is:
Figure BDA0003525086080000041
or
Figure BDA0003525086080000042
Wherein θ: each stage of no-load phase shift angle;
NE: the number of turns of the excitation winding;
NT: the number of turns of a first phase modulation winding and a second phase modulation winding in the phase modulation unit I or II during nth tapping;
n: the number of phase-shifted taps.
In some embodiments, the number of turns of the first phase-modulating winding and the second phase-modulating winding that can be obtained from equations (1-a) and (1-b) is:
Figure BDA0003525086080000043
or
Figure BDA0003525086080000044
In some embodiments, the different tap down phase winding number of turns in series and the operating logic of the ARS polarity selector specifically include:
the first operating logic: leading a phase shift angle, wherein the tapping position is from n to 1, the polarity of the phase modulation unit I is negative, the (2-b) type progressive serial input is applied, the polarity of the phase modulation unit II is positive, and the (2-a) type progressive serial input is applied;
the second operation logic: in the original position, no phase modulation winding is connected in series;
the third operating logic: and (3) lagging phase shifting angles, wherein the tapping positions are from-1 to-n, the polarity of the phase modulation unit I is positive, the (2-a) type cascade is applied, the polarity of the phase modulation unit II is negative, and the (2-b) type cascade is applied.
In some embodiments, when the number of turns of the voltage regulating winding is small, a cascade winding method is adopted to ensure the symmetry of the winding in the axial direction, even number of parallel wires are divided into two groups, the two groups are respectively wound at the upper end and the lower end, and a tap is led out after the number of turns required by each stage is finished until all the turns are finished.
Therefore, the scheme provided by the invention adopts a brand-new phase-shifting transformer structure with polygonal zigzag connection, can shift phase in a larger phase angle range and simultaneously solve the requirement that a line needs to maintain constant voltage amplitude, and the phase-shifting transformer with the structure is of a single-body structure, has less windings and simple wiring, is greatly simplified compared with the phase-shifting transformer with the traditional double-body structure for realizing the same function, reduces the design and manufacturing difficulty and improves the reliability of system operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a transformer wiring according to an embodiment of the present invention;
FIG. 2 is a diagram of a transformer structure arrangement according to an embodiment of the present invention;
fig. 3 is a polygonal meander voltage vector diagram according to an embodiment of the invention.
In the figure, 1-an excitation winding, 2-a first phase modulation winding, 3-a first ARS switch, 4-a first linear modulation switch, 5-a second phase modulation winding, 6-a second ARS switch, 7-a second linear modulation switch, 8-power outlet terminals SA, SB, SC, 9-load outlet terminals LA, LB, LC, 10-a transformer core, 11-a transformer oil tank, 12-phase modulation units I, 13-a phase modulation unit II.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a phase-shifting transformer with polygonal zigzag connection, which has the English name: a multi-winding zig-zag PST, as shown in particular in FIG. 1,
the phase modulation unit comprises an excitation winding 1, a phase modulation unit I12 and a phase modulation unit II 13;
the transformer is characterized in that an excitation winding, a phase modulation unit I12 and a phase modulation unit II13 are sequentially arranged on each core limb of a three-phase structure;
the three-phase winding SA phase excitation winding, the SB phase excitation winding and the SC phase excitation winding of the excitation winding are in star connection, and three input ends are led out to be respectively connected with three phases at a power supply side: SA, SB, SC;
three phases on the load side: LA, LB, LC are led out from the output end of phase modulation unit II.
In some embodiments, the phase modulation unit I12 comprises:
a first phase modulation winding 2, a first ARS switch 3 and a first linear modulation switch 4;
the first phase modulation winding 2 comprises: the transformer comprises an SA phase first phase modulation winding, an SB phase first phase modulation winding and an SC phase first phase modulation winding;
the first ARS switch 3 includes: the first ARS switch of SA looks, the first ARS switch of SB looks and the first ARS switch of SC looks;
the first linear switch 4 includes: the system comprises an SA phase first linear regulating switch, an SB phase first linear regulating switch and an SC phase first linear regulating switch;
the first end of the SA phase first ARS switch is connected with the output end of the SA phase excitation winding, the second end of the SA phase first ARS switch is connected with the first end of the SA phase first phase modulation winding, the second end of the SA phase first phase modulation winding is connected with the first end of the SA phase first linear modulation switch, and the second end of the SA phase first linear modulation switch is connected with the third end of the SA phase first ARS switch;
the first end of the SB phase first ARS switch is connected with the output end of the SB phase excitation winding, the second end of the SB phase first ARS switch is connected with the first end of the SB phase first phase modulation winding, the second end of the SB phase first phase modulation winding is connected with the first end of the SB phase first linear modulation switch, and the second end of the SB phase first linear modulation switch is connected with the third end of the SB phase first ARS switch;
the first end of the SC-phase first ARS switch is connected with the output end of the SC-phase excitation winding, the second end of the SC-phase first ARS switch is connected with the first end of the SC-phase first phase modulation winding, the second end of the SC-phase first phase modulation winding is connected with the first end of the SC-phase first linear modulation switch, and the second end of the SC-phase first linear modulation switch is connected with the third end of the SC-phase first ARS switch.
In some embodiments, said phase modulation unit II13 comprises:
a second phase modulation winding 5, a second ARS switch 6 and a second linear modulation switch 7;
the second phase modulation winding 5 includes: the SA phase second phase modulation winding, the SB phase second phase modulation winding and the SC phase second phase modulation winding;
the second ARS switch 6 includes: an SA-phase second ARS switch, an SB-phase second ARS switch and an SC-phase second ARS switch;
the second linear switch 7 includes: the SA phase second linear regulating switch, the SB phase second linear regulating switch and the SC phase second linear regulating switch;
the first end of the SA phase second ARS switch is connected with the fourth end of the SA phase first ARS switch, the second end of the SA phase second ARS switch is connected with the first end of the SA phase second phase modulation winding, the second end of the SA phase second phase modulation winding is connected with the first end of the SA phase second linear modulation switch, and the second end of the SA phase second linear modulation switch is connected with the third end of the SA phase second ARS switch;
a first end of the SB phase second ARS switch is connected with a fourth end of the SB phase first ARS switch, a second end of the SB phase second ARS switch is connected with a first end of the SB phase second phase modulation winding, a second end of the SB phase second phase modulation winding is connected with a first end of the SB phase second linear modulation switch, and a second end of the SB phase second linear modulation switch is connected with a third end of the SB phase second ARS switch;
the first end of the SC-phase second ARS switch is connected with the fourth end of the SC-phase first ARS switch, the second end of the SC-phase second ARS switch is connected with the first end of the SC-phase second phase modulation winding, the second end of the SC-phase second phase modulation winding is connected with the first end of the SC-phase second linear modulation switch, and the second end of the SC-phase second linear modulation switch is connected with the third end of the SV-phase second ARS switch.
In some embodiments, the first phase modulation winding 2 is wound by multiple stages of wire with different numbers of turns.
In some embodiments said second phase modulation winding 5 is wound by a plurality of different turns of wire.
In some embodiments, the load side voltage phase angle is controlled to lead or lag the source side voltage by the cooperation of the first ARS switch 3, the second ARS switch 6, the first linearly modulated switch 4 and the second linearly modulated switch 7.
In some embodiments, the relationship between the number of turns of the first phase winding 2 and the second phase winding 5 and the number of turns of the excitation winding is:
Figure BDA0003525086080000081
or
Figure BDA0003525086080000082
Wherein θ: each stage of no-load phase shift angle;
NE: the number of turns of the excitation winding;
NT: the number of turns of a first phase modulation winding 2 and a second phase modulation winding 5 in a phase modulation unit I12 or a phase modulation unit II13 during nth tapping;
n: the number of phase-shifted taps.
In some embodiments, the number of turns of first phase-modulating winding 2 and second phase-modulating winding 5 given by equations (1-a) and (1-b) is:
Figure BDA0003525086080000091
or
Figure BDA0003525086080000092
In some embodiments, as shown in table 1, the operation logic of the different tap down phase winding series-in turns and the ARS polarity selector specifically includes:
the first operating logic: leading a phase shift angle, wherein the tapping position is from n to 1, the polarity of the phase modulation unit I12 is negative, the (2-b) type is applied to cascade connection, the polarity of the phase modulation unit II13 is positive, and the (2-a) type is applied to cascade connection;
the second operation logic: in the original position, no phase modulation winding is connected in series;
the third operating logic: and (3) lagging phase shifting angles, wherein the tapping positions are from-1 to-n, the polarity of the phase modulation unit I12 is positive, the (2-a) type cascade connection is adopted, the polarity of the phase modulation unit II13 is negative, and the (2-b) type cascade connection is adopted.
TABLE 1
Figure BDA0003525086080000093
Fig. 2 is a structural layout diagram (plan view), all windings and iron cores (1, 2, 3, 10) are arranged in an oil tank 11, all switches (3, 4, 6, 7) are arranged at the end part of the long axis of the oil tank, and an 8 power outlet terminal and a 9 load outlet terminal are respectively arranged at two sides of the short axis of the oil tank and led out from the upper end of a tank cover.
Fig. 3 is a voltage vector diagram of a polygonal meander.
In some embodiments, when the number of turns of the voltage regulating winding is small, a cascade winding method is adopted to ensure the symmetry of the winding in the axial direction, even number of parallel wires are divided into two groups, the two groups are respectively wound at the upper end and the lower end, and a tap is led out after the number of turns required by each stage is finished until all the turns are finished.
In summary, the technical solutions of the aspects of the present invention have the following advantages compared with the prior art:
the invention provides a phase-shifting transformer with polygonal zigzag connection, which adopts a brand-new structure of the phase-shifting transformer with the polygonal zigzag connection, can shift the phase within a larger phase angle range and simultaneously solve the requirement that a circuit needs to maintain constant voltage amplitude.
It should be noted that the technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, the scope of the present description should be considered. The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A polygonal meander-coupled phase shifting transformer, said transformer comprising:
the device comprises an excitation winding, a phase modulation unit I and a phase modulation unit II;
the transformer is characterized in that the excitation winding, the phase modulation unit I and the phase modulation unit II are sequentially arranged on each core limb of a three-phase structure;
the three-phase winding SA phase excitation winding, the SB phase excitation winding and the SC phase excitation winding of the excitation winding are in star connection, and three input ends are led out to be respectively connected with three phases at a power supply side: SA, SB and SC;
three phases on the load side: LA, LB and LC are led out from the output end of phase modulation unit II.
2. The polygonal meander-coupled phase-shifting transformer of claim 1, wherein said phase modulating unit I comprises:
a first phase modulation winding, a first ARS switch and a first linear modulation switch;
the first phase modulation winding includes: the phase modulation winding comprises an SA phase first phase modulation winding, an SB phase first phase modulation winding and an SC phase first phase modulation winding;
the first ARS switch includes: the first ARS switch of SA looks, the first ARS switch of SB looks and the first ARS switch of SC looks;
the first linear switch includes: the system comprises an SA phase first linear regulating switch, an SB phase first linear regulating switch and an SC phase first linear regulating switch;
the first end of the SA phase first ARS switch is connected with the output end of the SA phase excitation winding, the second end of the SA phase first ARS switch is connected with the first end of the SA phase first phase modulation winding, the second end of the SA phase first phase modulation winding is connected with the first end of the SA phase first linear modulation switch, and the second end of the SA phase first linear modulation switch is connected with the third end of the SA phase first ARS switch;
the first end of the SB phase first ARS switch is connected with the output end of the SB phase excitation winding, the second end of the SB phase first ARS switch is connected with the first end of the SB phase first phase modulation winding, the second end of the SB phase first phase modulation winding is connected with the first end of the SB phase first linear modulation switch, and the second end of the SB phase first linear modulation switch is connected with the third end of the SB phase first ARS switch;
the first end of the SC-phase first ARS switch is connected with the output end of the SC-phase excitation winding, the second end of the SC-phase first ARS switch is connected with the first end of the SC-phase first phase modulation winding, the second end of the SC-phase first phase modulation winding is connected with the first end of the SC-phase first linear modulation switch, and the second end of the SC-phase first linear modulation switch is connected with the third end of the SC-phase first ARS switch.
3. The polygonal meander-coupled phase-shifting transformer of claim 2, wherein the phase-modulating unit II comprises:
a second phase modulation winding, a second ARS switch and a second linear modulation switch;
the second phase modulation winding includes: the second phase modulation winding of the SA phase, the second phase modulation winding of the SB phase and the second phase modulation winding of the SC phase;
the second ARS switch comprises: an SA-phase second ARS switch, an SB-phase second ARS switch and an SC-phase second ARS switch;
the second linear adjustment switch includes: the second linear regulating switch of the SA phase, the second linear regulating switch of the SB phase and the second linear regulating switch of the SC phase;
the first end of the SA phase second ARS switch is connected with the fourth end of the SA phase first ARS switch, the second end of the SA phase second ARS switch is connected with the first end of the SA phase second phase modulation winding, the second end of the SA phase second phase modulation winding is connected with the first end of the SA phase second linear modulation switch, and the second end of the SA phase second linear modulation switch is connected with the third end of the SA phase second ARS switch;
a first end of the SB phase second ARS switch is connected with a fourth end of the SB phase first ARS switch, a second end of the SB phase second ARS switch is connected with a first end of the SB phase second phase modulation winding, a second end of the SB phase second phase modulation winding is connected with a first end of the SB phase second linear modulation switch, and a second end of the SB phase second linear modulation switch is connected with a third end of the SB phase second ARS switch;
the first end of the SC-phase second ARS switch is connected with the fourth end of the SC-phase first ARS switch, the second end of the SC-phase second ARS switch is connected with the first end of the SC-phase second phase modulation winding, the second end of the SC-phase second phase modulation winding is connected with the first end of the SC-phase second linear modulation switch, and the second end of the SC-phase second linear modulation switch is connected with the third end of the SV-phase second ARS switch.
4. The polygonal meander-coupled phase shifting transformer of claim 3,
the first phase modulation winding is wound by a plurality of stages of wires with different turns.
5. The polygonal meander-coupled phase shifting transformer of claim 4,
the second phase modulation winding is wound by a plurality of stages of wires with different numbers of turns.
6. The polygonal meander-connected phase-shifting transformer of claim 5, wherein the first ARS switch, the second ARS switch, the first linearly modulated switch and the second linearly modulated switch cooperate to control the phase angle of the load-side voltage to be ahead or behind the voltage of the power source.
7. The polygonal meander-coupled phase shifting transformer of claim 6, wherein the number of turns of said first phase winding and said second phase winding is related to the number of turns of said excitation winding by:
Figure FDA0003525086070000031
or
Figure FDA0003525086070000032
Wherein θ: each stage of no-load phase shift angle;
NE: the number of turns of the excitation winding;
NT: the number of turns of the first phase modulation winding and the second phase modulation winding in the phase modulation unit I or II during nth tapping;
n: the number of phase-shifted taps.
8. The polygonal meander-coupled phase-shifting transformer of claim 7, wherein said first phase-modulating winding and said second phase-modulating winding have the following turns according to equations (1-a) and (1-b):
Figure FDA0003525086070000041
or
Figure FDA0003525086070000042
9. The polygonal meander-coupled phase-shifting transformer of claim 8, wherein the different taps reduce the number of phase winding series-wound turns and the operating logic of the ARS polarity selector specifically comprises:
the first operating logic: leading a phase shift angle, wherein the tapping position is from n to 1, the polarity of the phase modulation unit I is negative, the phase modulation unit I is serially connected step by applying a (2-b) formula, the polarity of the phase modulation unit II is positive, and the phase modulation unit II is serially connected step by applying a (2-a) formula;
the second operation logic: in the original position, no phase modulation winding is connected in series;
the third operating logic: and (3) lagging phase shifting angles, wherein the tapping positions are from-1 to-n, the polarity of the phase modulation unit I is positive, the (2-a) type cascade is applied, the polarity of the phase modulation unit II is negative, and the (2-b) type cascade is applied.
10. The phase-shifting transformer of claim 9, wherein when the number of turns of the voltage-regulating winding is small, the symmetry of the winding in the axial direction is ensured by using a cascade winding method, an even number of parallel wires are divided into two groups, the two groups are respectively wound up and down, and a tap is led out after each winding step is finished until all the turns are finished.
CN202210191362.8A 2022-02-28 2022-02-28 Phase-shifting transformer with polygonal zigzag connection Pending CN114664543A (en)

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