阅读说明：本技术 三相平衡性变压器 (Three-phase balance transformer ) 是由 刘勇滔 于 2021-07-20 设计创作，主要内容包括：本发明公开三相平衡性变压器,述三相平衡变压器由三组单相变压器组成,三组所述单相变压器一次侧初级线圈星形联结,三台所述单相变压器二次侧均设有若干次级线圈,所述次级线圈引线相互连接构成引线单入单出线圈结构。本发明所述三相平衡性变压器,系统输入带有零线,当次级线圈三相电压比值2:1:1,由于次级线圈串联,流经次级线圈的电流相等,这样分配到三个变压器初级线圈有功功率相等,三相有功电流相等,在进线侧做适当的无功补偿,就可以达到三相有功负荷平衡；若次级线圈三相电压相等,则由于次级线圈串联,流经次级线圈的电流相等,分配到三个变压器初级线圈视在功率相等,无需做无功补偿就可以达到三相电流平衡。(The invention discloses a three-phase balance transformer which consists of three groups of single-phase transformers, primary coils of primary sides of the three groups of single-phase transformers are connected in a star shape, secondary sides of the three groups of single-phase transformers are respectively provided with a plurality of secondary coils, and leads of the secondary coils are connected with each other to form a structure with a single-in single-out coil. According to the three-phase balanced transformer, the system input is provided with a zero line, when the ratio of three-phase voltage of the secondary coil to the three-phase voltage of the secondary coil is 2:1:1, the currents flowing through the secondary coil are equal due to the fact that the secondary coil is connected in series, active power of primary coils of three transformers is distributed to be equal, three-phase active currents are equal, and proper reactive compensation is conducted on the wire inlet side, so that three-phase active load balance can be achieved; if the three-phase voltages of the secondary coils are equal, the currents flowing through the secondary coils are equal due to the fact that the secondary coils are connected in series, the apparent powers of the currents distributed to the primary coils of the three transformers are equal, and three-phase current balance can be achieved without reactive compensation.)

1. A three-phase balanced transformer, characterized by: the three-phase balance transformer is composed of three groups of single-phase transformers, primary side primary coils of the three groups of single-phase transformers are connected in a star shape, secondary sides of the three single-phase transformers are respectively provided with a plurality of secondary coils, and leads of the secondary coils are mutually connected in series to form a lead single-in single-out coil structure.

2. The three-phase balanced transformer of claim 1, wherein: the three groups of single-phase transformers are respectively a transformer A, a transformer B and a transformer C, the secondary coil lead of the transformer A comprises a lead A1 and a lead A2, the secondary coil lead of the transformer B comprises a lead B1 and a lead B2, and the secondary coil lead of the transformer C comprises a lead C1 and a lead C2.

3. The three-phase balanced transformer of claim 2, wherein: three groups of primary coils of the single-phase transformer are normally connected with incoming lines UA, UB and UC of a system and system lines N, and the secondary coil is a single-channel coil which enters into a C1 from A1.

4. The three-phase balanced transformer of claim 3, wherein: the secondary coil is connected in a mode that a lead A2 is connected with a lead B2, a lead B1 is connected with a lead C2 or a lead C2 is connected with a lead B2, and a lead B1 is connected with a lead A2.

5. The three-phase balanced transformer of claim 2, wherein: three groups of primary coils of the single-phase transformer are normally connected with incoming lines UA, UB and UC of a system and system lines N, and the secondary coil is a single-channel coil which enters B1 from A1.

6. The three-phase balanced transformer of claim 5, wherein: the secondary coil is connected in a mode that a lead A2 is connected with a lead C2, a lead C1 or a lead B2 is connected with a lead B2 and a lead C2, and a lead C1 is connected with a lead A2.

7. The three-phase balanced transformer of claim 2, wherein: three groups of single-phase transformer primary coils are normally connected to incoming lines UA, UB and UC of a system and system N lines, the secondary coils are single-channel coils which enter B2 from A2, the secondary coils are connected in two modes, namely a lead B1 and a lead C2, the lead C1 and the lead A1 are connected and connected with a lead A1 and a lead C2, and the lead C1 and the lead B1 are connected.

8. The three-phase balanced transformer of claim 2, wherein: three groups of single-phase transformer primary coils are normally connected to incoming lines UA, UB, UC and system N lines of a system, secondary coils are single-channel coils which enter a C2 from A2, the secondary coils are connected in two modes, namely a lead A1 and a lead B2, the lead B1 and a lead C1 are connected and connected with a lead A1 and a lead B1, and the lead B2 and a lead C1 are connected.

9. The three-phase balanced transformer of claim 2, wherein: three groups of single-phase transformer primary coils are normally connected to incoming lines UA, UB and UC of a system and system N lines, the secondary coils are single-channel coils which enter a C1 from B1, the secondary coils are connected in two modes, namely a lead B2 and a lead A2, the lead A1 and the lead C2 are connected and connected with a lead C2 and a lead A2, and the lead A1 and the lead B2 are connected.

10. The three-phase balanced transformer of claim 2, wherein: three groups of single-phase transformer primary coils are normally connected to incoming lines UA, UB and UC of a system and system N lines, the secondary coils are single-channel coils which enter a C2 from B2, the secondary coils are connected in two modes, namely a lead B1 and a lead A2, the lead A1 and the lead C1 are connected and connected with a lead C1 and a lead A2, and the lead A1 and the lead B1 are connected.

Technical Field

The invention relates to the technical field of transformers, in particular to a three-phase balanced transformer.

Background

Long-term unbalanced three-phase operation of a power transformer leads to a series of problems such as increased transformer losses, reduced transformer output, reduced active motor output, increased loss on distribution lines, and damage to consumer devices. At present, generally, the measures adopted for the three-phase unbalance of the distribution transformer are reactive compensation, and the three-phase unbalance of the distribution transformer can be reduced to a certain extent through a capacitor in reactive compensation equipment, but the influence on a power grid can be generated, for example, harmonic current is amplified.

Therefore, it is necessary to design a three-phase balanced transformer to solve the above problems.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a three-phase balanced transformer, and the specific technical scheme is as follows:

the three-phase balance transformer consists of three groups of single-phase transformers, primary side primary coils of the three groups of single-phase transformers are connected in a star shape, secondary sides of the three single-phase transformers are respectively provided with a plurality of secondary coils, and leads of the secondary coils are connected in series to form a structure with a single lead-in and single lead-out coil.

As an improvement of the above technical solution, the three groups of single-phase transformers are respectively a transformer a, a transformer B and a transformer C, the lead of the secondary coil of the transformer a includes a lead a1 and a lead a2, the lead of the secondary coil of the transformer B includes a lead B1 and a lead B2, and the lead of the secondary coil of the transformer C includes a lead C1 and a lead C2.

As an improvement of the above technical solution, three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC and system N of the system, and the secondary coil is a single-channel coil that enters from a1 to C1.

As an improvement of the technical scheme, the secondary coil is connected in a mode that a lead A2 is connected with a lead B2, a lead B1 is connected with a lead C2 or a lead C2 is connected with a lead B2, and a lead B1 is connected with a lead A2.

As an improvement of the above technical solution, three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC and system N of the system, and the secondary coil is a single-channel coil from a1 to B1.

As an improvement of the technical scheme, the secondary coil is connected in a mode that a lead A2 is connected with a lead C2, a lead C1 or a lead B2 is connected with a lead B2 and a lead C2, and a lead C1 is connected with a lead A2.

As an improvement of the above technical solution, three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC and system N of the system, the secondary coil is a single-channel coil that enters B2 from a2, the secondary coils are connected in two ways, namely, a lead B1 and a lead C2, the lead C1 and the lead a1 are connected to a lead a1 and a lead C2, and the lead C1 and the lead B1 are connected.

As an improvement of the above technical solution, three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC and system N of the system, the secondary coil is a single-channel coil that enters C2 from a2, the secondary coils are connected in two ways, namely, a lead a1 and a lead B2, a lead B1 and a lead C1 are connected to a lead a1 and a lead B1, and a lead B2 and a lead C1 are connected to each other.

As an improvement of the above technical solution, three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC and system N of the system, the secondary coil is a single-channel coil that enters C1 from B1, the secondary coils are connected in two ways, namely, a lead B2 and a lead a2, the lead a1 and the lead C2 are connected to a lead C2 and a lead a2, and the lead a1 and the lead B2 are connected.

As an improvement of the above technical solution, three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC and system N of the system, the secondary coil is a single-channel coil that enters C2 from B2, the secondary coils are connected in two ways, namely, a lead B1 and a lead a2, the lead a1 and the lead C1 are connected to a lead C1 and a lead a2, and the lead a1 and the lead B1 are connected.

Compared with the prior art, the invention has the following technical effects:

according to the three-phase balanced transformer, the system input is provided with a zero line, when the ratio of three-phase voltage of the secondary coil to the three-phase voltage of the secondary coil is 2:1:1, the currents flowing through the secondary coil are equal due to the fact that the secondary coil is connected in series, active power of primary coils of three transformers is distributed to be equal, three-phase active currents are equal, and proper reactive compensation is conducted on the wire inlet side, so that three-phase active load balance can be achieved; if the three-phase voltages of the secondary coils are equal, the currents flowing through the secondary coils are equal due to the fact that the secondary coils are connected in series, the apparent powers of the currents distributed to the primary coils of the three transformers are equal, and three-phase current balance can be achieved without reactive compensation.

Drawings

FIG. 1 is a schematic diagram of a connection of secondary coils of a first embodiment of a three-phase balanced transformer according to the present invention;

FIG. 2 is a schematic diagram of a secondary winding of a second embodiment of the three-phase balanced transformer according to the present invention;

FIG. 3 is a schematic diagram of the connection of the secondary coils of the third embodiment of the three-phase balanced transformer according to the present invention;

FIG. 4 is a schematic diagram of a connection of secondary coils of a fourth embodiment of the three-phase balanced transformer according to the present invention;

FIG. 5 is a schematic diagram illustrating a connection of secondary coils of a fifth embodiment of a three-phase balanced transformer according to the present invention;

FIG. 6 is a schematic diagram illustrating a connection of secondary coils of a sixth embodiment of a three-phase balanced transformer according to the present invention;

FIG. 7 is a schematic diagram illustrating a connection of secondary coils of a seventh embodiment of the three-phase balanced transformer according to the present invention;

FIG. 8 is a schematic diagram illustrating a connection of secondary coils of an eighth embodiment of the three-phase balanced transformer according to the present invention;

FIG. 9 is a schematic diagram illustrating a connection of secondary coils of a ninth embodiment of the three-phase balanced transformer according to the present invention;

fig. 10 is a schematic diagram illustrating a connection manner of secondary coils of a tenth embodiment of the three-phase balanced transformer according to the present invention;

FIG. 11 is a schematic diagram illustrating the connection of the secondary coils of the eleventh embodiment of the three-phase balanced transformer according to the present invention;

fig. 12 is a schematic diagram illustrating a connection manner of secondary coils of a twelfth embodiment of the three-phase balanced transformer according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Example 1

As shown in fig. 1, the three-phase balanced transformer of the present invention comprises three sets of single-phase transformers, primary coils of primary sides of the three sets of single-phase transformers are connected in a star shape, secondary sides of the three sets of single-phase transformers are respectively provided with a plurality of secondary coils, and leads of the secondary coils are connected in series to form a single-in single-out coil structure.

The three groups of single-phase transformers are respectively a transformer A, a transformer B and a transformer C, the secondary coil lead of the transformer A comprises a lead A1 and a lead A2, the secondary coil lead of the transformer B comprises a lead B1 and a lead B2, and the secondary coil lead of the transformer C comprises a lead C1 and a lead C2.

The first embodiment of the invention is that three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC of a system and system N lines, a lead A2 is connected with a lead B2, a lead B1 is connected with a lead C2, and a secondary coil is a group of coils from A1 to C1. Obtaining a required voltage value U according to a connection mode and a phase angle wiring mode by using the relation 2 Ua-Ub-Uc of voltage values at two ends of the coils A1A2, B1B2 and C1C2_XWhen A1C1 is used as a power supply to access a load, the secondary coils are connected in series, so that the active power distributed to the primary coils of the three transformers is equal to Pa, Pb, andpc, when the apparent power is not equal to 2Sa Sb Sc, the three-phase active current is equal, and proper reactive compensation is carried out on the incoming line side, so that the real three-phase active load balance can be achieved; if the relationship Ua between the voltage values at the two ends of the coils A1a2, B1B2 and C1C2 is Ub ═ Uc, the relationship equation of the required voltage value Ux is Ux ═ Ua '+ Ub' + Uc ', Ua ═ Ua', Ub ═ 2Ub ', Uc ═ 2 Uc', Ua ═ 2Ub '═ 2 Uc', and when A1C1 is used as a power supply to be connected to a load, since the secondary coils are connected in series, the currents flowing through the secondary coils are equal, and are distributed to the three transformer primary coils, the apparent power Sa ═ Sb ═ Sc, and the active power Pa ═ 2Pb ═ 2Pc, and the three-phase currents are equal, and the three-phase current balance can be achieved without reactive compensation.

Example 2

The second embodiment of the invention is different from other embodiments in that three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC and system N of a system, a lead a2 is connected with a lead C2, a lead C1 is connected with a lead B2, and a secondary coil is a group of coils from a1 to B1. Obtaining a required voltage value U according to a connection mode and a phase angle wiring mode by using the relation 2 Ua-Uc-Ub of voltage values at two ends of the coils A1A2, B1B2 and C1C2_XWhen a load is connected by taking A1B1 as a power supply, the currents flowing through the secondary coils are equal, so that the active power of the primary coils of the three transformers is equal to Pa Pc and Pb, the apparent power is not equal to 2Sa and Sc, the three-phase active currents are equal, and proper reactive compensation is performed on the incoming line side, so that the true three-phase active load balance can be achieved; if the relationship Ua between the voltage values at the two ends of the coils A1a2, B1B2 and C1C2 is Uc ═ Ub, the relationship formula of the required voltage value Ux is obtained according to the connection mode and the phase angle routing mode as Ux ═ Ua '+ Uc' + Ub ', Ua ═ Ua', Uc ═ 2Uc ', Ub ═ 2 Ub', Ua ═ 2Uc '═ 2 Ub', and when A1B1 is used as a power supply to access a load, the currents flowing through the secondary coils are equal due to the series connection of the secondary coils, and the apparent powers distributed to the primary coils of the three transformers are equal Sa ═ 2Ub ═Sc is Sb, the active power is Pa 2Pc 2Pb, the three-phase current is equal, and the real three-phase current balance can be achieved without reactive compensation.

Example 3

The third embodiment of the invention is different from other embodiments in that three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC and system N of a system, a lead wire B1 is connected with a lead wire C2, a lead wire C1 is connected with a lead wire a1, and a secondary coil is a group of coils from a2 to B2. Obtaining a required voltage value U according to a connection mode and a phase angle wiring mode by using the relation Ub-Uc-2 Ua of voltage values at two ends of the coils A1A2, B1B2 and C1C2_XWhen a load is connected by taking the A2B2 as a power supply, the currents flowing through the secondary coils are equal, so that the active power distributed to the primary coils of the three transformers is equal to Pb and Pc and the apparent power is not equal to Sb and Sc which is equal to 2Sa, the three-phase active currents are equal, and proper reactive compensation is performed on the inlet side, so that the real three-phase active load balance can be achieved; if the relationship Ua between the voltage values at the two ends of the coils A1A2, B1B2 and C1C2 is Uc ═ Ub, a relationship equation of the required voltage value Ux is obtained according to the connection mode and the phase angle routing mode as Ux ═ Ub ' + Uc ' + Ua ', Ub ═ 2Ub ', Uc ═ 2Uc ', Ua ═ Ua ', 2Ub ' ═ 2Uc ' ═ Ua ', and when A2B2 is used as a power supply to be connected to a load, since the secondary coils are connected in series, the currents flowing through the secondary coils are equal, the currents are distributed to the three transformer primary coils, the apparent power is equal to Sb ═ Sa, the active power is unequal to 2Pb ═ Pc ═ 2Pa, the three-phase currents are equal, and the three-phase balance can be achieved without reactive compensation.

Example 4

The fourth embodiment of the invention is different from other embodiments in that three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC and system N of a system, a lead a1 is connected with a lead B1, a lead B2 is connected with a lead C1, and a secondary coil is a group of coils from a2 to C2. The relationship Uc ═ Ub ═ 2Ua of the voltage values across the coils A1a2, B1B2, C1C2, depending on the connection modeObtaining the required voltage value U by a phase angle wiring mode_XWhen A2C2 is used as a power supply to access a load, the currents flowing through the secondary coils are equal because the secondary coils are connected in series, so that the active power of the primary coils of the three transformers is equal to Pc ═ Pb ═ Pa, the apparent power is not equal to Sc ═ 2Sa, the three-phase active currents are equal, and proper reactive compensation is performed on the inlet side, so that the real three-phase active load balance can be achieved; if the relationship Uc between the voltage values at the two ends of the coils A1A2, B1B2, and C1C2 is Ub ═ Ua, the relationship between the voltage values at the two ends of the coils A1A2, B1B2, and C1C2 is obtained as Ux ═ Uc '+ Ub' + Ua ', Uc ═ 2 Uc', Ub ═ 2Ub ', Ua ═ Ua', 2Uc '═ 2Ub ═ Ua', and when A2C2 is used as a power supply to access a load, since the secondary coils are connected in series, the currents flowing through the secondary coils are equal, the currents are distributed to the three transformer primary coils with equal apparent power Sc ═ Sb ═ Sa, and the active powers with unequal 2Pc ═ 2Pb ═ Pa, and the three-phase currents are equal, and the current balance can be achieved without reactive compensation.

Example 5

The fifth embodiment of the invention is different from other embodiments in that three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC and system N of a system, a lead wire B2 is connected with a lead wire C2, a lead wire C1 is connected with a lead wire a2, and a secondary coil is a group of coils from a1 to B1. Obtaining a required voltage value U according to a connection mode and a phase angle wiring mode by using the relation 2 Ub-Uc-Ua of voltage values at two ends of the coils A1A2, B1B2 and C1C2_XWhen a load is connected by taking A1B1 as a power supply, the currents flowing through the secondary coils are equal, so that the active power distributed to the primary coils of the three transformers is equal to Pb and Pc and the apparent power is not equal to 2Sb and Sc, the three-phase active currents are equal, and proper reactive compensation is performed on the inlet side, so that the true three-phase active load balance can be achieved; if the relationship Ub-Uc-Ua of the voltage values across the coils A1a2, B1B2, C1C2,according to the connection mode and the phase angle wiring mode, the relation formula of the required voltage value Ux is Ux ' + Uc ' + Ua ', Ub ' + Ub ', Uc ' + 2Uc ', Ua ' + 2Ua ', Ub ' + 2Uc ' and when A1B1 is used as a power supply to be connected into a load, because the secondary coils are connected in series, the current flowing through the secondary coils is equal, the current is distributed to the three transformer primary coils, the apparent power is equal to Sb ═ Sc ═ Sa, the active power is unequal to Pb ═ 2Pc ═ 2Pa, the three-phase current is equal, and the three-phase current balance in the true sense can be achieved without reactive power compensation.

Example 6

The sixth embodiment of the invention is different from other embodiments in that three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC and system N of a system, a lead wire B2 is connected with a lead wire a2, a lead wire a1 is connected with a lead wire C2, and a secondary coil is a group of coils from B1 to C1. Obtaining a required voltage value U according to a connection mode and a phase angle wiring mode by using the relation 2 Ub-Ua-Uc of voltage values at two ends of the coils A1A2, B1B2 and C1C2_XWhen B1C1 is used as a power supply to access a load, the currents flowing through the secondary coils are equal because the secondary coils are connected in series, so that the active power distributed to the primary coils of the three transformers is equal to Pb Pa Pc, while the apparent power is not equal to 2Sb Sa Sc, the three-phase active currents are equal, and proper reactive compensation is performed on the inlet side, so that the true three-phase active load balance can be achieved; if the relationship Ub between the voltage values at the two ends of the coils A1a2, B1B2 and C1C2 is Ua ═ Uc, the relationship between the voltage values at the two ends of the coils A1a2, B1B2 and C1C2 is obtained according to the connection mode and the phase angle routing mode, and the relationship between the required voltage value Ux is Ux ═ Ub ' + Ua ' + Uc ', Ub ═ 2Ub ', Ua ═ Uc ', Uc ═ 2Uc ', Ub ═ 2Uc ', and when the B1C1 is used as a power supply to be connected to a load, since the secondary coils are connected in series, the currents flowing through the secondary coils are equal, the currents distributed to the three transformer primary coils are equal in apparent power Sb Sa ═ Sc, and the active power Pb ═ 2Pa ═ 2Pc, the three-phase currents are equal, and the three-phase current balance can be achieved without reactive compensation in the true sense

Example 7

First aspect of the inventionThe seven embodiments are different from other embodiments in that three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC of a system and lines of a system N, a lead C1 is connected with a lead A2, a lead A1 is connected with a lead B1, and a secondary coil is a group of coils from B2 to C2. Obtaining a required voltage value U according to a connection mode and a phase angle wiring mode by using the relation Uc-Ua-2 Ub of voltage values at two ends of the coils A1A2, B1B2 and C1C2_XWhen B2C2 is used as a power supply to access a load, the currents flowing through the secondary coils are equal because the secondary coils are connected in series, so that the active power of the primary coils of the three transformers is equal to Pc ═ Pa ═ Pb, the apparent power is not equal to Sc ═ 2Sb, the three-phase active currents are equal, and proper reactive compensation is performed on the inlet side, so that the real three-phase active load balance can be achieved; if the relation Uc between the voltage values at the two ends of the coils A1a2, B1B2, C1C2 is Ua ═ Ub, the relation of the required voltage value Ux is Ux ═ Uc ' + Ua ' + Ub ', Uc ═ 2Uc ', Ua ═ 2Ua ', Ub ═ Ub ', 2Uc ' ═ 2Ua ═ Ub ═ and B ═ 2 is obtained according to the connection mode and the phase angle routing mode, and when a load is connected to the B2C2 as the power supply, the currents flowing through the secondary coils are equal because the secondary coils are connected in series, the currents distributed to the three transformer primary coils are equal in apparent power Sc Sa ═ Sb, and the active powers are unequal in 2Pc ═ 2Pa ═ Pb, the three-phase currents are equal, and the three-phase balance can be achieved without reactive compensation.

Example 8

The eighth embodiment of the invention is different from other embodiments in that three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC and system N of a system, a lead a1 is connected with a lead C2, a lead C1 is connected with a lead B1, and a secondary coil is a group of coils from a2 to B2. Obtaining a required voltage value U according to a connection mode and a phase angle wiring mode by using the relation Ua-Uc-2 Ub of voltage values at two ends of the coils A1A2, B1B2 and C1C2_XWhen a load is connected to a power supply of A2B2, the secondary coil is connected in series, and the secondary wire flows through the secondary coilThe currents of the coils are equal, so that the active power of the primary coils of the three transformers is equal to Pa (Pc) and Pb, the apparent power is unequal to Sa (Sc) and 2Sb, the three-phase active currents are equal, and proper reactive compensation is carried out on the incoming line side, so that the real three-phase active load balance can be achieved; if the relationship Ua between the voltage values at the two ends of the coils A1A2, B1B2 and C1C2 is Uc ═ Ub, the relationship equation of the required voltage value Ux is Ux ═ Ua ' + Uc ' + Ub ', Ua ═ 2Ua ', Uc ═ 2Uc ', Ub ═ Ub ', 2Ua ═ 2Uc ' ═ Ub ═ according to the connection mode and the phase angle routing mode, and when A2B2 is used as a power supply to access a load, since the secondary coils are connected in series, the currents flowing through the secondary coils are equal, and are distributed to the three transformer primary coils, the apparent power Sa ═ Sc ═ Sb, and the active power Pc ═ 2Pa ═ Pc ═ Pb, the three-phase currents are equal, and the three-phase balance can be achieved without reactive compensation.

Example 9

The ninth embodiment of the present invention is different from the other embodiments in that three groups of the primary coils of the single-phase transformer are normally connected to the incoming lines UA, UB, UC and the system N line of the system, the lead C2 is connected to the lead a2, the lead a1 is connected to the lead B2, and the secondary coil is a group of coils from B1 to C1. Obtaining a required voltage value U according to a connection mode and a phase angle wiring mode by using a relation 2 Uc-Ua-Ub of voltage values at two ends of coils A1A2, B1B2 and C1C2_XWhen B1C1 is used as a power supply to access a load, the currents flowing through the secondary coils are equal because the secondary coils are connected in series, so that the active power of the primary coils of the three transformers is equal to Pc ═ Pa ═ Pb, the apparent power is not equal to 2Sc ═ Sa ═ Sb, the three-phase active currents are equal, and proper reactive compensation is performed on the inlet side, so that the real three-phase active load balance can be achieved; if the relationship Uc between the voltage values at the two ends of the coils A1a2, B1B2, C1C2 is Ua ═ Ub, the relationship between the required voltage value Ux is Ux ═ Uc ' + Ua ' + Ub ', Uc ═ Uc ', Ua ═ 2Ua ', Ub ═ 2Ub ', Uc ' ═ 2Ua ' ═ 2Ub ' according to the connection mode and the phase angle routing mode, and when a load is connected using B1C1 as the power supply, the current flows through the secondary coil in series, and then flows through the secondary coil in seriesThe currents of the secondary coils are equal, the apparent power distributed to the primary coils of the three transformers is equal to Sc (Sa) Sb, the active power is unequal to Pc (2 Pa) 2Pb, the three-phase currents are equal, and the real three-phase current balance can be achieved without reactive compensation.

Example 10

The tenth embodiment of the present invention is different from the other embodiments in that three groups of the primary coils of the single-phase transformer are normally connected to the incoming lines UA, UB, UC and the system N of the system, the lead C2 is connected to the lead B2, the lead B1 is connected to the lead a2, and the secondary coil is a group of coils from a1 to C1. Obtaining a required voltage value U according to a connection mode and a phase angle wiring mode by using the relation 2 Uc-Ub-Ua of voltage values at two ends of the coils A1A2, B1B2 and C1C2_XWhen a load is connected by taking the A1C1 as a power supply, the currents flowing through the secondary coils are equal, so that the active power of the primary coils of the three transformers is equal to Pc ═ Pb ═ Pa, the apparent power is not equal to 2Sc ═ Sb ═ Sa, the three-phase active currents are equal, and proper reactive compensation is performed on the inlet wire side, so that the real three-phase active load balance can be achieved; if the relationship Uc between the voltage values at the two ends of the coils A1a2, B1B2, and C1C2 is "Ub" ("Ua"), the relationship between the required voltage values Ux is "Ux" ("Uc" + Ub "+ Ua"), and "Uc" ("Uc"), and "Ub" ("2 Ub" ("Ua"), and "Uc" ("Uc") is 2Ub "(" 2Ua "), according to the connection mode and the phase angle routing mode, when A1C1 is used as a power supply to be connected to a load, since the secondary coils are connected in series, the currents flowing through the secondary coils are equal, and are distributed to the three transformer primary coils, where the apparent power Sc is equal to Sa, and the active power is unequal to Pc ═ 2Pb ═ 2Pa, and the three-phase currents are equal, and a true three-phase current balance can be achieved without reactive compensation.

Example 11

The eleventh embodiment of the invention is different from the other embodiments in that three groups of the primary coils of the single-phase transformer are normally connected to the incoming lines UA, UB, UC and the system N of the system, the lead a1 is connected with the lead B2, the lead B1 is connected with the lead C1, and the secondary coil is a coil from a2 to C2And (6) coil assembly. Obtaining a required voltage value U according to a connection mode and a phase angle wiring mode by using the relation Ua-Ub-2 Uc of voltage values at two ends of the coils A1A2, B1B2 and C1C2_XWhen A2C2 is used as a power supply to access a load, the currents flowing through the secondary coils are equal because the secondary coils are connected in series, so that the active power distributed to the primary coils of the three transformers is equal to Pa and Pb and the apparent power is not equal to Sa and Sb, which are equal to 2Sc, the three-phase active currents are equal, and proper reactive compensation is performed on the inlet side, so that the real three-phase active load balance can be achieved; if the relationship Ua between the voltage values at the two ends of the coils A1A2, B1B2 and C1C2 is Ub ═ Uc, the relationship equation of the required voltage value Ux is Ux ═ Ua ' + Ub ' + Uc ', Ua ═ 2Ua ', Ub ═ 2Ub ', Uc ═ Uc ', 2Ua ═ 2Ub ═ Uc ', and when A2C2 is used as a power supply to access a load, since the secondary coils are connected in series, the currents flowing through the secondary coils are equal, and are distributed to the three transformer primary coils, the apparent power Sa ═ Sb ═ Sc, and the active power 2Pa ═ 2Pb ═ Pc, and the three-phase currents are equal, and the three-phase balance can be achieved without reactive compensation.

Example 12

The twelfth implementation mode of the invention is different from other implementation modes in that three groups of primary coils of the single-phase transformer are normally connected to incoming lines UA, UB, UC and system N lines of a system, a lead wire B1 is connected with a lead wire a2, a lead wire a1 is connected with a lead wire C1, and a secondary coil is a group of coils from B2 to C2. Obtaining a required voltage value U according to a connection mode and a phase angle wiring mode by using the relation Ub-Ua-2 Uc of voltage values at two ends of the coils A1A2, B1B2 and C1C2_XWhen B2C2 is used as a power supply to be connected into a load, the currents flowing through the secondary coils are equal because the secondary coils are connected in series, so that the active power distributed to the primary coils of the three transformers is equal to Pb Pa Pc, while the apparent power is not equal to Sb Sa 2Sc, the three-phase active currents are equal, and proper reactive compensation is performed on the inlet side, so that the true meaning can be achievedBalancing the active load of the three phases; if the relationship Ub between the voltage values at the two ends of the coils A1a2, B1B2 and C1C2 is Ua ═ Uc, the relationship equation of the required voltage value Ux is Ux ═ Ub '+ Ua' + Uc ', Ub ═ 2Ub, Ua ═ 2 Ua', Uc ═ Uc, 2Ub ═ 2Ua ═ Uc, 2Ua ═ Uc ═ 2Uc ═ Uc, and after a load is connected to the B2C2 as a power source, since the secondary coils are connected in series, the currents flowing through the secondary coils are equal, the currents are distributed to the three transformer primary coils, the apparent power is equal to Sb Sa ═ Sc, the active power is equal to 2Pb ═ 2Pa ═ Pc, the three-phase currents are equal, and the three-phase balance can be achieved without reactive compensation.

It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.