CN215183483U - Three-phase-shifting transformer adopting novel winding - Google Patents

Abstract

The embodiment of the application provides a three-phase-shifting transformer adopting a novel winding, which comprises three groups of single-phase transformation groups and two side line ports; each single-phase transformation group includes: the transformer comprises an iron core column, a first winding, a second winding and a third winding; and the voltage vector angle theta of the winding on the iron core column of each single-phase transformation set corresponds to the phase difference theta between the voltage of the line I and the voltage of the line II. The input voltage and the output voltage are designed and manufactured to be different in phase, so that the method is suitable for the condition that adjacent lines or substation incoming lines have phase difference and can not be operated in a closed loop mode, and the power supply reliability of the load is improved; meanwhile, the connecting structure between each part is simplified, the technical difficulty is reduced, and the method is suitable for occasions with higher voltage levels.

Description

Three-phase-shifting transformer adopting novel winding

Technical Field

The application belongs to the power supply field, and especially relates to a three-phase-shifting transformer adopting a novel winding.

Background

The alternating current produced, transmitted and distributed by power plants and power grids in China is three-phase alternating current, 4 high-voltage lines with voltage levels of 220kV, 110kV, 35kV and 10kV lines exist in the power grids of partial regions at present, and the transformation ratio of a transformer substation is 220/110/35 (connection label Y/Y/delta), 110/35/10 (Y/Y/delta), 35/10 (Y/delta) and the like. Therefore, the phase difference between adjacent lines inevitably occurs in the power transmission and distribution process, more and more important loads are required, the power supply reliability is required to be higher and higher, the load is not allowed to be powered off even if a certain line is overhauled, and in order to improve the power supply reliability, the problem that the adjacent lines with the phase difference cannot be operated in a closed loop mode is required to be solved.

The basic principle of the single-core phase-shifting transformer is that one part of one phase voltage is connected with the other phase voltage, so the structure is simpler, but the voltage regulating coil is positioned at the head end of the line, the voltage level of the tap switch is higher, and the tap switch directly bears various overvoltage and overcurrent in the operation of a power grid, so the single-core phase-shifting transformer is not suitable for high voltage level.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the three-phase-shifting transformer adopting the novel winding is provided, the input voltage and the output voltage are designed and manufactured to be different phases, the three-phase-shifting transformer is suitable for the condition that the phase difference exists between adjacent lines or the incoming lines of a transformer substation and the loop closing operation cannot be carried out, and the power supply reliability of the load is improved; meanwhile, the connecting structure between each part is simplified, the technical difficulty is reduced, and the method is suitable for occasions with higher voltage levels.

Specifically, the three-phase-shifting transformer that adopts novel winding that this application embodiment provided includes:

three groups of single-phase transformation groups and two side line ports;

each group of single-phase transformation groups comprises an iron core column, a first winding, a second winding and a third winding;

a voltage vector angle theta of a winding on each single-phase transformation set iron core column corresponds to a phase difference theta between a line I voltage and a line II voltage;

the iron core columns comprise an A-phase iron core column, a B-phase iron core column and a C-phase iron core column;

and a first winding, a second winding and a third winding are wound on each phase of iron core column.

Optionally, the upper end of the first winding is connected to the lower end of a second winding wound on the same core limb to form a series winding.

Optionally, the series winding includes:

the A-phase series winding, the B-phase series winding and the C-phase series winding are connected in series;

the upper end of a first winding in the A-phase series winding is connected with the lower end of a second winding in series, the connection point is U, and the port of the upper end of the second winding is A; the upper end of a first winding in the B-phase series winding is connected with the lower end of a second winding in series, the connection point is V, and the upper end port of the second winding is B; the upper end of a first winding in the C-phase series winding is connected with the lower end of a second winding in series, the connection point is W, and the port of the upper end of the second winding is C.

Optionally, the lower end of the phase a series winding is connected to the upper end port B of the phase B series winding, the lower end of the phase B series winding is connected to the upper end port C of the phase C series winding, the lower end of the phase C series winding is connected to the upper end port a of the phase a series winding, and the ports ABC form a triangular connection.

Optionally, in the three-phase-shifting transformer using the novel winding:

the lower end of a third winding wound on the phase A iron core column is connected to a connecting point W, and the port of the upper end is a; the lower end of a third winding wound on the B-phase iron core column is connected to a connection point U, and the port of the upper end of the third winding is B; and the lower end of a third winding wound on the C-phase iron core column is connected to a connection point V, and the port of the upper end is C.

Optionally, the three-phase-shifting transformer with the novel winding includes line ports on two sides;

port A, B, C leads out as a line port on the transformer side;

the ports a, b and c are led out to be used as line ports on the other side of the transformer;

the ratio of the voltage at line ports a, b, c to the voltage at line port A, B, C is K.

Optionally, the number of turns of the first winding is N1, and the number of turns of the second winding is N2;

the total number of turns of the first winding (1) and the second winding (2) on one core limb is N, and N is N1+ N2.

The beneficial effect that technical scheme that this application provided brought is:

the input voltage and the output voltage are designed and manufactured to be different in phase, so that the method is suitable for the condition that adjacent lines or substation incoming lines have phase difference and can not be operated in a closed loop mode, and the power supply reliability of the load is improved; meanwhile, compared with a single-core phase-shifting transformer, the transformer is suitable for high voltage grades; compared with a double-core phase-shifting transformer, the transformer is simple in structure and beneficial to installation.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a winding connection diagram of a three-phase-shifting transformer employing a novel winding according to the present application;

FIG. 2 is a voltage vector diagram corresponding to embodiment 2;

fig. 3 is an exemplary corresponding voltage vector diagram.

The attached drawings are marked as follows:

1 is a first winding, 1-1 is a first winding on an A-phase iron core column, 1-2 is a first winding on a B-phase iron core column, and 1-3 is a first winding on a C-phase iron core column; 2 is a second winding, 2-1 is a second winding on the phase A iron core column, 2-2 is a second winding on the phase B iron core column, and 2-3 is a second winding on the phase C iron core column; 3 is a third winding, 3-1 is a third winding on the phase A iron core column, 3-2 is a third winding on the phase B iron core column, and 3-3 is a third winding on the phase C iron core column; 4 is an iron core column, 4-1 is an A-phase iron core column, 4-2 is a B-phase iron core column, and 4-3 is a C-phase iron core column.

Detailed Description

To make the structure and advantages of the present application clearer, the structure of the present application will be further described with reference to the accompanying drawings.

The first embodiment is as follows:

specifically, the winding connection diagram of the phase-shifting transformer is shown in fig. 1.

A three-phase shifting transformer employing novel windings, said transformer comprising:

three groups of single-phase transformation groups and two side line ports;

each single-phase transformation group includes:

the core limb 4, the first winding 1, the second winding 2 and the third winding 3;

and the voltage vector angle theta of the winding on the iron core column 4 of each single-phase transformation set corresponds to the phase difference theta between the voltage of the line I and the voltage of the line II.

In the implementation, the three-phase-shifting transformer adopting the novel winding provided by the embodiment of the application is used for the power transmission and distribution of three-phase alternating current, the angle difference exists in adjacent lines which can be inevitably generated in the power transmission and distribution process, the current important loads are more and more, the power supply reliability is required to be higher and more, the load power failure is not allowed even if a certain line is overhauled, and in order to improve the power supply reliability, the problem of the closed loop operation of the adjacent lines with the phase difference needs to be solved.

In order to meet the requirements, the embodiment of the application provides a three-phase-shifting transformer adopting novel windings, which comprises an A-phase transformation group, a B-phase transformation group and a C-phase transformation group, wherein each group of single-phase transformation group comprises an iron core column 4 and three groups of windings, the three groups of windings are wound on the iron core column 4, different electric potentials exist on each group of windings, and the voltage of a line I and the voltage of a line II form a phase difference theta through the voltage combination of the windings in the three groups of single-phase transformers.

Three groups of single-phase transformers are respectively connected to the phase A, the phase B and the phase C of three-phase alternating current, three groups of windings in each group of single-phase transformation groups divide the voltage of the access line I, and the windings in different single-phase transformation groups are combined to output the voltage of the line II.

The scheme adopts a structure that all windings in a single-phase transformer group are wound on the same iron core column, thereby solving the problems of complex connecting structure and high installation difficulty; the method is suitable for high-voltage grade conditions, and meanwhile, the phase difference is adjusted by controlling the voltage distribution of the windings, so that the closed-loop operation of the original circuit with the phase difference is realized.

Example two:

specifically, the method comprises the following steps: when the line port A, B, C is connected to phase a, phase B, and phase C of the three-phase ac power, respectively, the corresponding voltage vector diagram of the phase-shifting transformer is shown in fig. 2.

Based on the three-phase-shifting transformer adopting the novel winding provided by the first embodiment, the present embodiment provides a more detailed phase-shifting transformer.

Optionally, the core limb includes:

a phase A core limb 4-1, a phase B core limb 4-2 and a phase C core limb 4-3.

Optionally, the upper end of the first winding 1 is connected to the lower end of the second winding 2 wound on the same core limb 4 to form a series winding.

Optionally, the series winding includes:

the A-phase series winding, the B-phase series winding and the C-phase series winding are connected in series;

the upper end of a first winding 1-1 in the A-phase series winding is connected with the lower end of a second winding 2-1 in series, the connection point is U, and the port of the upper end of the second winding 2-1 is A; the upper end of a first winding 1-2 in the phase B series winding is connected with the lower end of a second winding 2-2 in series, the connection point is V, and the port at the upper end of the second winding 2-2 is B; the upper end of a first winding 1-3 in the C-phase series winding is connected with the lower end of a second winding 2-3 in series, the connection point is W, and the port of the upper end of the second winding 2-3 is C.

Solid lines AB, BC, and CA correspond to line voltages

And

namely, the voltages on the a-phase series winding, the B-phase series winding, and the C-phase series winding.

Optionally, the lower end of the phase a series winding is connected to the upper end port B of the phase B series winding, the lower end of the phase B series winding is connected to the upper end port C of the phase C series winding, and the lower end of the phase C series winding is connected to the upper end port a of the phase a series winding to form a triangular connection.

Optionally, the three-phase-shifting transformer using the novel winding includes two line ports;

the port A, B, C is led out to serve as a line port on one side of the transformer;

the ports a, b and c are led out to be used as line ports on the other side of the transformer;

the ratio of the voltage at line ports a, b, c to the voltage at line port A, B, C is K.

The solid lines UB, VC, WA correspond to the winding voltage of the first winding 1-1 on the phase A core limb 4-1

Winding voltage of the first winding 1-2 on the B-phase core limb 4-2

Winding voltage of the first winding 1-3 on the C-phase core limb 4-3

The solid lines AU, BV, CW correspond to the winding voltage of the second winding 2-1 on the A-phase core limb 4-1

Winding voltage of the second winding 2-2 on the B-phase core limb 4-2

Winding voltage of the second winding 2-3 on the C-phase core limb 4-3

Optionally, the connection mode of the third winding 3 includes:

the lower end of a third winding 3-1 on the phase A iron core column 4-1 is connected to a connection point W, and the port of the upper end is a; the lower end of a third winding 3-2 on the B-phase iron core column 4-2 is connected to a connection point U, and the port of the upper end is B; the lower end of a third winding 3-3 on the C-phase iron core column 4-3 is connected to a connection point V, and the port at the upper end is C.

The line segments aU, bV and cW correspond to the winding voltage of the third winding 3-1 on the A-phase iron core column 4-1

Winding voltage of third winding 3-2 on B-phase iron core column 4-2

Winding voltage of third winding 3-3 on C-phase iron core column 4-3

Line voltage of line ports a, b and c of the phase-shifting transformer corresponding to line segments ab, bc and ca of the double-dot chain line

Theta corresponds to the phase difference between the voltage at line ports a, b, c and the voltage at line port A, B, C, i.e.

And

and

and

the phase differs by theta.

And

and

and

the amplitude ratio is K.

And (4) optional. The number of turns of the first winding 1 is N1, the number of turns of the second winding 2 is N2, and the number of turns of the third winding 3 is N3;

the total number of turns of the first winding 1 and the second winding 2 on one core leg 4 is N, which is N1+ N2, and corresponds to the line voltage at the line port A, B, C.

Optionally, the turn ratio N1/N, N2/N and N3/N of the three-phase-shifting transformer using the novel winding, the voltage of the line ports a, b and c, the voltage amplitude ratio K of the line port A, B, C, and the phase difference θ have the following mathematical relations:

the voltage combination of each winding in the three groups of single-phase transformers enables the voltage of the line I and the voltage of the line II to form a phase difference theta so as to achieve the effect of changing the phase difference of the voltages of the two lines, and the closed-loop operation is realized.

Three groups of single-phase transformers are respectively connected to the phase A, the phase B and the phase C of three-phase alternating current, three groups of windings in each group of single-phase transformation groups divide the voltage of the access line I, and the windings in different single-phase transformation groups are combined to output the voltage of the line II.

The voltage regulating coil of the existing transformer with a single-core structure is positioned at the head end of a line, and a tap switch has higher voltage level and directly bears various overvoltage and overcurrent in the operation of a power grid; different from a single-core structure transformer, the transformer takes a series winding as the head end of a line, and solves the problem that the single-core structure is not suitable for high-voltage grade conditions.

The transformer is different from the existing transformer with a double-core structure, and consists of a series transformer and an excitation transformer which are arranged on two independent iron cores and are respectively arranged in two independent transformer oil tanks; all windings in the single-phase transformer set are wound on the same iron core column 4, so that the problems of complex connection structure and high installation difficulty are solved.

Example (c):

specifically, A of a line I is connected with a port A of a phase-shifting transformer, B of the line I is connected with a port B of the phase-shifting transformer, and C of the line I is connected with a port C of the phase-shifting transformer; the A phase of the line II is connected with the port a of the phase-shifting transformer, the B phase of the line II is connected with the port B of the phase-shifting transformer, and the C phase of the line II is connected with the port C of the phase-shifting transformer.

Based on the phase-shifting transformer provided in the second embodiment, the present embodiment provides an example of a transformer, specifically:

the corresponding voltage vector diagram of the phase-shifting transformer is shown in fig. 3, and this example is basically the same as the second embodiment, except that:

the line i voltage leads the line ii voltage by 30 ° (θ equals 30 °), and the line i and the line ii voltage are equal (K equals 1).

The turn ratio N1/N, N2/N and N3/N of the phase-shifting transformer are designed according to the following relation:

when the required voltage ratio K and the phase difference theta of the front line and the rear line are known, the voltage ratio can be realized only by adjusting the turns ratio of the transformer.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (7)

1. Adopt three-phase-shifting transformer of novel winding, its characterized in that, the transformer includes:

three groups of single-phase transformation groups and two side line ports;

each group of single-phase transformation groups comprises an iron core column, a first winding, a second winding and a third winding;

a voltage vector angle theta of a winding on each single-phase transformation set iron core column corresponds to a phase difference theta between a line I voltage and a line II voltage;

the iron core columns comprise an A-phase iron core column, a B-phase iron core column and a C-phase iron core column;

and a first winding, a second winding and a third winding are wound on each phase of iron core column.

2. The phase-shifting transformer according to claim 1, wherein the upper end of the first winding is connected to the lower end of the second winding wound on the same core leg to form a series winding.

3. The three-phase-shifting transformer with novel winding according to claim 2, characterized in that the series winding comprises:

the A-phase series winding, the B-phase series winding and the C-phase series winding are connected in series;

the upper end of a first winding in the A-phase series winding is connected with the lower end of a second winding in series, the connection point is U, and the port of the upper end of the second winding is A; the upper end of a first winding in the B-phase series winding is connected with the lower end of a second winding in series, the connection point is V, and the upper end port of the second winding is B; the upper end of a first winding in the C-phase series winding is connected with the lower end of a second winding in series, the connection point is W, and the port of the upper end of the second winding is C.

4. The three-phase-shifting transformer with the novel windings according to claim 3, wherein the lower end of the A-phase series winding is connected with the upper end port B of the B-phase series winding, the lower end of the B-phase series winding is connected with the upper end port C of the C-phase series winding, the lower end of the C-phase series winding is connected with the upper end port A of the A-phase series winding, and the ports ABC form a triangular connection.

5. The three-phase-shifting transformer with novel winding according to claim 1, wherein in the three-phase-shifting transformer with novel winding:

the lower end of a third winding wound on the phase A iron core column is connected to a connecting point W, and the port of the upper end is a; the lower end of a third winding wound on the B-phase iron core column is connected to a connection point U, and the port of the upper end of the third winding is B; and the lower end of a third winding wound on the C-phase iron core column is connected to a connection point V, and the port of the upper end is C.

6. The three-phase-shifting transformer with novel windings according to claim 1, wherein the three-phase-shifting transformer with novel windings comprises two side line ports;

port A, B, C leads out as a line port on the transformer side;

the ports a, b and c are led out to be used as line ports on the other side of the transformer;

the ratio of the voltage at line ports a, b, c to the voltage at line port A, B, C is K.

7. The three-phase-shifting transformer with the novel winding is characterized in that the number of turns of the first winding is N1, the number of turns of the second winding is N2;

the total number of turns of the first winding (1) and the second winding (2) on one core limb is N, and N is N1+ N2.

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