CN216818067U - Multi-magnetic-core combined connecting structure of three-phase high-frequency transformer - Google Patents

Abstract

The utility model discloses a multi-magnetic core combined connection structure of a three-phase high-frequency transformer, which belongs to the technical field of the multi-magnetic core combined connection structure. /C The three-phase magnetic flux passes through the same magnetic core with a phase difference of 120°, so there is not only an electrical connection between the phases, but also a magnetic connection. In case of short-circuit fault of the phase load, the internal magnetic field of the transformer will mutually hinder the current mutation, and the other two phases will not be seriously eccentric, reducing the risk of secondary damage to the circuit system. To improve the power density of the transformer, it can be connected according to different requirements such as Yy, Yd, Dy, etc., and the connection method is flexible and changeable.

Description

A three-phase high-frequency transformer multi-core combined connection structure

technical field

The utility model relates to a multi-magnetic core combined connection structure, in particular to a multi-magnetic core combined connection structure of a three-phase high-frequency transformer, which belongs to the technical field of multi-magnetic core combined connection structures.

Background technique

In high-frequency magnetic components, when the transformer needs to be made into three-phase and has a large capacity or has special requirements for external dimensions, multiple sets of coils and magnetic cores need to be combined to form a three-phase transformer. The general method is to make three independent transformers. Single-phase transformers, and then combined and connected according to different connection methods to form the required three-phase transformers, as shown in Figure 1 of the manual, taking Yy0 connection as an example and Figure 2;

However, the existing technology has the following problems:

1. Each magnetic core is only wound with a single set of coils, the A/B/C three-phase magnetic circuit is relatively independent, and there is only electrical connection between phases and no magnetic connection;

2. Once one phase fails in the circuit, it will cause serious eccentric load of the other two phases, which will damage the circuit system twice;

3. The coil is wound only on the central column of the magnetic core, the space utilization rate is low, and the size of the transformer is large;

Therefore, a three-phase high-frequency transformer multi-core combined connection structure is designed to optimize the above problems.

Utility model content

The main purpose of the utility model is to provide a three-phase high-frequency transformer multi-core combined connection structure, each E-shaped magnetic core is wound with three groups of A/B/C coils, A/B/C three-phase magnetic flux Pass through the same magnetic core with a phase difference of 120°, so there is not only an electrical connection between the phases, but also a magnetic connection;

Due to the magnetic connection between the phases, even if there is a short-circuit fault in the load of one phase in the circuit, the internal magnetic field of the transformer will mutually hinder the current mutation, and the other two phases will not be seriously eccentric, reducing the risk of secondary damage to the circuit system;

Coils are wound on the center column and side column of the magnetic core, which has a large space utilization rate and improves the power density of the transformer;

It can be connected according to different requirements of Yy, Yd, Dy, etc., and the connection method is flexible and changeable.

The purpose of the present utility model can be achieved by adopting the following technical solutions:

A three-phase high-frequency transformer multi-magnetic core combined connection structure, comprising a three-phase transformer E-type magnetic core 1, a three-phase transformer E-type magnetic core 2 and a three-phase transformer E-type magnetic core 3;

N14 coils, N15 coils, N16 coils, N24 coils, N25 coils are wound above the side columns and the central column of the three-phase transformer E-type magnetic core 1, the three-phase transformer E-type magnetic core 2 and the three-phase transformer E-type magnetic core 3 Coil, N26 Coil, N34 Coil, N35 Coil and N36 Coil;

N11 coils, N12 coils, N13 coils, N21 coils, N22 coils are wound under the side pillars and the central pillars of the E-type magnetic core 1 of the three-phase transformer, the E-type magnetic core 2 of the three-phase transformer and the E-type magnetic core 3 of the three-phase transformer. Coil, N23 Coil, N31 Coil, N32 Coil and N33 Coil;

The secondary coils on the E-type magnetic core 1 of the three-phase transformer, the E-type magnetic core 2 of the three-phase transformer and the E-type magnetic core 3 of the three-phase transformer are electrically connected to each other. The primary coils on the E-type magnetic core 2 of the phase transformer and the E-type magnetic core 3 of the three-phase transformer are electrically connected to each other to form a Yy0, Yy, Yd or Dy electrical connection structure.

Preferably, the terminal 2 of the N14 coil is electrically connected to the terminal 1 of the N25 coil;

N15 coil 2 terminal is electrically connected to N26 coil terminal 1;

The 2 terminal of the N16 coil is electrically connected to the 1 terminal of the N24 coil.

Preferably, the 2 terminals of the N24 coil are electrically connected to the 1 terminal of the N35 coil;

The 2 terminal of the N25 coil is electrically connected to the 1 terminal of the N36 coil;

The 2 terminal of the N26 coil is electrically connected to the 1 terminal of the N34 coil.

Preferably, the 2 terminals of the N34 coil, the N35 coil and the N36 coil are electrically connected to each other.

Preferably, the 2 terminal of the N11 coil is electrically connected to the 1 terminal of the N22 coil;

Terminal 2 of the N12 coil is electrically connected to the terminal 1 of the N23 coil;

The 2 terminal of the N13 coil is electrically connected to the 1 terminal of the N21 coil.

Preferably, the 2 terminals of the N21 coil are electrically connected to the 2 terminals of the N32 coil;

The 2 terminals of the N22 coil are electrically connected to the 2 terminals of the N33 coil;

The 2-terminal of the N23 coil is electrically connected to the 2-terminal of the N31 coil.

Preferably, the 1 terminals of the N31 coil, the N32 coil and the N33 coil are electrically connected to each other.

Beneficial technical effects of the present utility model:

The utility model provides a three-phase high-frequency transformer multi-magnetic core combined connection structure, each E-shaped magnetic core is wound with three sets of A/B/C coils, and the A/B/C three-phase magnetic flux is 120°. The phase difference passes through the same magnetic core, so there is not only an electrical connection between the phases, but also a magnetic connection;

Due to the magnetic connection between the phases, even if there is a short-circuit fault in the load of one phase in the circuit, the internal magnetic field of the transformer will mutually hinder the current mutation, and the other two phases will not be seriously eccentric, reducing the risk of secondary damage to the circuit system;

Coils are wound on the center column and side column of the magnetic core, which has a large space utilization rate and improves the power density of the transformer;

It can be connected according to different requirements of Yy, Yd, Dy, etc., and the connection method is flexible and changeable.

Description of drawings

Fig. 1 is a prior art three-phase transformer connection diagram;

Figure 2 is an existing electrical schematic diagram;

Fig. 3 is a preferred embodiment of the three-phase high-frequency transformer multi-core combination Yy0 connection circuit diagram of the present invention;

4 is a simple electrical schematic diagram of a preferred embodiment of the three-phase high-frequency transformer multi-core combination Yy0 connection method of the present utility model;

5 is a simple electrical schematic diagram of a preferred embodiment of the three-phase high-frequency transformer multi-core combination Yy connection method of the present invention;

6 is a simple electrical schematic diagram of a three-phase high-frequency transformer multi-core combination Yd connection method according to a preferred embodiment of the present invention;

FIG. 7 is a simple electrical schematic diagram of a three-phase high-frequency transformer multi-core combination Dy connection method according to a preferred embodiment of the present invention.

In the picture: 1-E-type magnetic core of three-phase transformer, E-type magnetic core 2 of 2-phase transformer, E-type magnetic core 3 of 3-phase transformer.

Detailed ways

In order to make the technical solutions of the present invention more clear and clear to those skilled in the art, the present invention will be described in further detail below with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

As shown in FIGS. 3 to 7 , a three-phase high-frequency transformer multi-core combined connection structure provided in this embodiment includes three-phase transformer E-type magnetic core 1 1, three-phase transformer E-type magnetic core 2 2 and three Phase transformer E-type magnetic core three 3;

Three-phase transformer E-type magnetic core 1 1, three-phase transformer E-type magnetic core 2 2 and three-phase transformer E-type magnetic core 3 The side column and the center column are wound with N14 coil, N15 coil, N16 coil, N24 coil, N25 coil, N26 coil, N34 coil, N35 coil and N36 coil;

Three-phase transformer E-type magnetic core 1 1, three-phase transformer E-type magnetic core 2 2 and three-phase transformer E-type magnetic core 3 3 The side column and the center column are wound with N11 coil, N12 coil, N13 coil, N21 coil, N22 coil, N23 coil, N31 coil, N32 coil and N33 coil;

The secondary coils on the E-type magnetic core 1 of the three-phase transformer, the E-type magnetic core 2 of the three-phase transformer, and the E-type magnetic core 3 of the three-phase transformer are electrically connected to each other. The primary coils on the E-type magnetic core 2 of the phase transformer and the E-type magnetic core 3 of the three-phase transformer are electrically connected to each other to form a Yy0, Yy, Yd or Dy electrical connection structure.

Winding the center column of the E-shaped magnetic core (the cross-sectional area of the center column is twice that of the side column), and at the same time, the side column is also wound with coils to make use of the winding space of the side column, and make A/B/C three-phase The coils are distributed on each set of magnetic cores, so that in addition to the electrical connection between the phases, there is also a magnetic connection. Finally, the coils are connected according to different connection methods such as Yy, Yd, Dy, etc. to obtain the required three-phase transformer, and the connection method is changeable and flexible.

In the E-shaped magnetic core (the cross-sectional area of the central column is twice that of the side column), the coils are respectively wound around the center column and the side column. The number of coil turns is the same.

In this embodiment, the 2 terminal of the N14 coil is electrically connected to the 1 terminal of the N25 coil;

N15 coil 2 terminal is electrically connected to N26 coil terminal 1;

The 2 terminal of the N16 coil is electrically connected to the 1 terminal of the N24 coil.

In this embodiment, the 2 terminal of the N24 coil is electrically connected to the 1 terminal of the N35 coil;

The 2 terminal of the N25 coil is electrically connected to the 1 terminal of the N36 coil;

The 2 terminal of the N26 coil is electrically connected to the 1 terminal of the N34 coil.

In this embodiment, the 2 terminals of the N34 coil, the N35 coil and the N36 coil are electrically connected to each other.

In this embodiment, the 2 terminal of the N11 coil is electrically connected to the 1 terminal of the N22 coil;

Terminal 2 of the N12 coil is electrically connected to the terminal 1 of the N23 coil;

The 2 terminal of the N13 coil is electrically connected to the 1 terminal of the N21 coil.

In this embodiment, the 2 terminals of the N21 coil are electrically connected to the 2 terminals of the N32 coil;

The 2 terminals of the N22 coil are electrically connected to the 2 terminals of the N33 coil;

The 2-terminal of the N23 coil is electrically connected to the 2-terminal of the N31 coil.

In this embodiment, the 1 terminals of the N31 coil, the N32 coil and the N33 coil are electrically connected to each other.

Each group of magnetic cores and coils are connected according to different connection methods to obtain the required transformer, as shown in Figure 2.

Take Yy0 connection as an example, as shown in Figure 3, set:

The potential generated by N1 is E1,

The potential generated by N2 is E2,

The potential generated by N3 is E3,

The primary side A phase voltage (P1-N) is UA,

The primary side phase B phase voltage (P2-N) is UB,

The primary side C phase voltage (P3-N) is UC,

Secondary A-phase voltage (S1-n) is Ua,

Secondary B-phase voltage (S2-n) is Ub,

The secondary side C phase voltage (S3-n) is Uc,

Connect the coil N1 of the primary side group 1 to the N2 of the group 2 and the N3 of the group 3 to become the A phase. Since the cross-sectional area of the magnetic core side column is 1/2 of the middle column, the potential generated by N1 and N3 is 1/2 of that of N2. That is, E1=E3=E2/2, so the final phase voltage UA of phase A on the primary side is twice the electromotive force E2 generated by N2, that is, UA=2E2=4E1=4E3, and similarly UB=UC=UA=2E2=4E1 =4E3.

Similarly, the secondary side has Ua=Ub=Uc.

The above are only further embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. The equivalent replacement or modification of the concept thereof shall belong to the protection scope of the present invention.

Claims (7)

1. A three-phase high-frequency transformer multi-core combined connection structure is characterized in that: comprising three-phase transformer E-type magnetic core one (1), three-phase transformer E-type magnetic core two (2) and three-phase transformer E-type three (3) cores; N14 coils, N15 Coil, N16 Coil, N24 Coil, N25 Coil, N26 Coil, N34 Coil, N35 Coil and N36 Coil; N11 coils, N12 coils and N12 coils are wound under the side pillars and the central pillars of the three-phase transformer E-type magnetic core one (1), the three-phase transformer E-type magnetic core two (2), and the three-phase transformer E-type magnetic core three (3). Coil, N13 Coil, N21 Coil, N22 Coil, N23 Coil, N31 Coil, N32 Coil and N33 Coil; The secondary coils on the E-type magnetic core one (1) of the three-phase transformer, the E-type magnetic core two (2) of the three-phase transformer, and the E-type magnetic core three (3) of the three-phase transformer are electrically connected to each other. The primary coils on the E-type magnetic core one (1) of the phase transformer, the E-type magnetic core two (2) of the three-phase transformer, and the E-type magnetic core three (3) of the three-phase transformer are electrically connected to each other to form YyO, Yy, Yd or Dy electrical connection structure. 2. A three-phase high-frequency transformer multi-core combined connection structure according to claim 1, characterized in that: the N14 coil 2 terminal is electrically connected to the N25 coil terminal 1; N15 coil 2 terminal is electrically connected to N26 coil terminal 1; The 2 terminal of the N16 coil is electrically connected to the 1 terminal of the N24 coil. 3. A three-phase high-frequency transformer multi-core combined connection structure according to claim 2, characterized in that: the 2 terminals of the N24 coil are electrically connected to the 1 terminal of the N35 coil; The 2 terminal of the N25 coil is electrically connected to the 1 terminal of the N36 coil; The 2 terminal of the N26 coil is electrically connected to the 1 terminal of the N34 coil. 4. A three-phase high-frequency transformer multi-core combined connection structure according to claim 3, characterized in that: the 2 terminals of the N34 coil, the N35 coil and the N36 coil are electrically connected to each other. 5. A three-phase high-frequency transformer multi-core combined connection structure according to claim 4, characterized in that: the 2 terminals of the N11 coil are electrically connected to the 1 terminal of the N22 coil; Terminal 2 of the N12 coil is electrically connected to the terminal 1 of the N23 coil; The 2 terminal of the N13 coil is electrically connected to the 1 terminal of the N21 coil. 6. A three-phase high-frequency transformer multi-core combined connection structure according to claim 5, characterized in that: the 2 terminals of the N21 coil are electrically connected to the 2 terminals of the N32 coil; The 2 terminals of the N22 coil are electrically connected to the 2 terminals of the N33 coil; The 2-terminal of the N23 coil is electrically connected to the 2-terminal of the N31 coil. 7 . The multi-core combined connection structure of a three-phase high-frequency transformer according to claim 6 , wherein the 1 terminals of the N31 coil, the N32 coil and the N33 coil are electrically connected to each other. 8 .

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