CN215578126U

CN215578126U - A forced shunt balance transformer

Info

Publication number: CN215578126U
Application number: CN202121682523.0U
Authority: CN
Inventors: 张静; 张栋; 刘力强; 谢京; 程从明; 王永强; 常涛; 许婉
Original assignee: Baoding Tianwei Baobian Electric Co Ltd
Current assignee: Baoding Tianwei Baobian Electric Co Ltd
Priority date: 2021-07-23
Filing date: 2021-07-23
Publication date: 2022-01-18
Anticipated expiration: 2031-07-23

Abstract

The utility model relates to a forced shunt balance transformer, which belongs to the technical field of transformers. The technical scheme of the utility model is as follows: the inner and outer windings (2) are two windings, which are respectively the inner winding and the outer winding, which are arranged on the iron core column (1) together, and the number of turns of the windings is equal; The end-to-end connection is connected through the upper and lower leads (3), the upper lead (4) of the inner winding is connected to the upper end of the inner winding, and is connected to the voltage regulating tap circuit, and the lower lead (5) of the outer winding is connected to the lower end of the outer winding, which are respectively connected to the tap changer branches. 1. The second branch of the tap changer and the third branch of the tap changer. The beneficial effect of the utility model is that a forced current shunt balance transformer is connected in series in the circuit to realize the mandatory current shunt requirement of each switch of the two-phase or three-phase tap changer.

Description

Forced shunting balance transformer

Technical Field

The utility model relates to a forced shunt balance transformer, and belongs to the technical field of transformers.

Background

When the capacity of each stage of the voltage regulating winding of some products exceeds the maximum stage capacity of the conventional tap switch, the scheme that the two-phase or three-phase on-load tap switch is used as a single-phase switch is adopted to realize on-load voltage regulation. The use of such a tap changer requires that the transformer winding has a forced shunting structure, i.e. that the currents flowing into the branches of the switch are theoretically identical, so as to ensure reliable operation of the switch. It is a common practice to design the common winding and the regulating winding of the transformer as several independent electrical branches, and the winding branches must be weakly magnetic coupled, and each branch is connected with a switch. Therefore, when the on-load voltage regulating switch is switched to act in different periods, the current flowing through each branch switch is still equal. However, for part of on-load tap changers, the windings are difficult to adopt arrangement structures meeting requirements, the condition of realizing forced shunt cannot be met, and other design schemes must be adopted to meet the requirement of forced shunt.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a forced shunt balancing transformer, which realizes the forced shunt requirement of each change-over switch of a two-phase or three-phase tap switch by connecting a forced shunt balancing transformer in series in a circuit, and effectively solves the problems in the prior art.

The technical scheme of the utility model is as follows: a forced shunt balance transformer comprises a core limb, an inner winding, an outer winding, an upper and lower connecting lead of the inner winding, an upper outgoing line of the inner winding and a lower outgoing line of the outer winding, wherein the inner winding and the outer winding are two windings, the inner winding and the outer winding are respectively arranged on the core limb together, and the number of turns of the windings is equal; the inner winding and the outer winding of each phase are connected end to end and are connected through an upper connecting lead and a lower connecting lead of the inner winding and the outer winding, an outgoing line at the upper part of the inner winding is connected with the head end of the inner winding and is connected with a voltage-regulating tapping loop, and an outgoing line at the lower part of the outer winding is connected with the tail end of the outer winding and is respectively connected with each branch of a tapping switch.

The iron core columns and the inner and outer windings are respectively provided with two groups and have a two-column iron core structure.

The iron core column and the inner and outer windings are respectively provided with three groups and are of a three-column iron core structure, the iron core column comprises a first iron core column, a second iron core column and a third iron core column, and the inner and outer windings comprise a first coil, a second coil, a third coil, a fourth coil, a fifth coil and a sixth coil; a first coil and a second coil are wound on the first iron core column, a third coil and a fourth coil are wound on the second iron core column, and a fifth coil and a sixth coil are wound on the third iron core column; the tail end of the first coil on the first iron core column is connected with the head end of the fourth coil on the second iron core column, the tail end of the third coil on the second iron core column is connected with the head end of the sixth coil on the third iron core column, the tail end of the fifth coil on the third iron core column is connected with the head end of the second coil on the first iron core column, and the windings on the three iron core columns realize Z-shaped connection to form three electrical branches; the tail ends of the coil I, the coil III and the coil V are connected together and are connected with a voltage-regulating tapping loop, and the tail ends of the coil II, the coil IV and the coil VI are respectively connected with a tapping switch branch I, a tapping switch branch II and a tapping switch branch III.

The utility model has the beneficial effects that: the forced shunt requirements of each change-over switch of the two-phase or three-phase tapping switch are realized by connecting a forced shunt balance transformer in series in the circuit.

Drawings

FIG. 1 is a wiring schematic of a three-phase core structure of the present invention;

FIG. 2 is a front view of the structure of the present invention;

in the figure: the transformer comprises an iron core column 1, an inner winding and an outer winding 2, an upper and lower connecting lead 3 of the inner winding and the outer winding, an upper outgoing line 4 of the inner winding, a lower outgoing line 5 of the outer winding, a first coil 21, a second coil 22, a third coil 23, a fourth coil 24, a fifth coil 25, a sixth coil 26, a first tap switch branch 6, a second tap switch branch 7 and a third tap switch branch 8.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments, which are preferred embodiments of the present invention. It is to be understood that the described embodiments are merely a subset of the embodiments of the utility model, and not all embodiments; it should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. 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.

A forced shunt balance transformer comprises a core limb 1, an inner winding and an outer winding 2, an upper and lower connecting lead 3 of the inner winding and the outer winding, an upper outgoing line 4 of the inner winding and a lower outgoing line 5 of the outer winding, wherein the inner winding and the outer winding 2 are two windings, the two windings are respectively the inner winding and the outer winding and are jointly arranged on the core limb 1, and the number of turns of the windings is equal; the inner winding and the outer winding 2 of each phase are connected end to end and are connected through an upper connecting lead 3 and a lower connecting lead 3 of the inner winding and the outer winding, an upper outgoing line 4 of the inner winding is connected with the head end of the inner winding and is connected with a voltage-regulating tapping loop, and a lower outgoing line 5 of the outer winding is connected with the tail end of the outer winding and is respectively connected with each branch of a tapping switch.

The iron core column 1 and the inner and outer windings 2 are respectively provided with two groups and have a two-column iron core structure.

The iron core column 1 and the inner and outer windings 2 are respectively provided with three groups and are of a three-column iron core structure, the iron core column 1 comprises a first iron core column, a second iron core column and a third iron core column, and the inner and outer windings 2 comprise a first coil 21, a second coil 22, a third coil 23, a fourth coil 24, a fifth coil 25 and a sixth coil 26; a first coil 21 and a second coil 22 are wound on the first iron core column, a third coil 23 and a fourth coil 24 are wound on the second iron core column, and a fifth coil 25 and a sixth coil 26 are wound on the third iron core column; the tail end of an upper coil I21 of the first iron core column is connected with the head end of an upper coil II 24 of the iron core column, the tail end of an upper coil III 23 of the second iron core column is connected with the head end of an upper coil III 26 of the iron core column, the tail end of an upper coil V25 of the third iron core column is connected with the head end of an upper coil II 22 of the first iron core column, and the windings on the three iron core columns realize Z-shaped connection to form three electrical branches; the head ends of the first coil 21, the third coil 23 and the fifth coil 25 are connected together and are connected to a voltage-regulating tapping loop, and the tail ends of the second coil 22, the fourth coil 24 and the sixth coil 26 are respectively connected with a first tapping switch branch 6, a second tapping switch branch 7 and a third tapping switch branch 8.

In practical application, according to related technical parameters of the tap switch, excitation influence on the forced shunt balance transformer caused by asynchronous tap switch switching is fully considered, excitation and induction voltages of the forced shunt balance transformer are calculated, and performance parameters such as capacity and impedance and an insulation structure of the forced shunt balance transformer are further determined.

According to the number of the electrical branches of the tap switch, the forced shunt balance transformer is of a two-column or three-column iron core structure, an inner winding and an outer winding are arranged on the iron core column, and the number of turns of the windings is equal. The windings are connected in a Z shape, and the electromagnetic balance principle of the windings is utilized to ensure that currents of all branches in the same phase are equal under any condition, so that the problem of uneven current distribution between the change-over switches when the two-phase or three-phase tap switch is used is solved.

Claims

1. A forced shunt balanced transformer, characterized in that: it comprises an iron core column (1), an inner and outer winding (2), an upper and lower connecting lead (3) of the inner and outer windings, an upper lead wire (4) of the inner winding and a lower lead wire (4) of the outer winding. 5), the inner and outer windings (2) are two windings, namely the inner winding and the outer winding, which are arranged on the core column (1) together, and the number of turns of the windings is equal; the inner and outer windings (2) of each phase are connected end to end, through the The upper and lower lead wires (3) of the inner and outer windings are connected, the upper lead wire (4) of the inner winding is connected to the head end of the inner winding, and is connected to the voltage regulating tap circuit, and the lower lead wire (5) of the outer winding is connected to the tail end of the outer winding, and the taps are respectively connected each branch of the switch.

2 . The forced shunt balance transformer according to claim 1 , wherein the iron core column ( 1 ) and the inner and outer windings ( 2 ) have two groups each, which is a two-column core structure. 3 .

3 . The forced shunt balance transformer according to claim 1 , wherein the core column ( 1 ) and the inner and outer windings ( 2 ) have three groups each, which is a three-column core structure, and the core column ( 1 ) contains an iron core. 4 . Column 1, core column 2 and core column 3, the inner and outer windings (2) include coil one (21), coil two (22), coil three (23), coil four (24), coil five (25) and coil six ( 26); coil one (21) and coil two (22) are wound on iron core column one, coil three (23) and coil four (24) are wound on iron core column two, coil five (25) and coil six (26) It is wound on the iron core column three; the tail end of the coil one (21) on the iron core column one is connected to the head end of the coil four (24) on the iron core column two, and the tail end of the coil three (23) on the iron core column two is connected to the iron core column three. The head end of the coil six (26), the tail end of the coil five (25) on the third core column is connected to the head end of the coil two (22) on the core column one, and the windings on the three core columns are connected in a Z shape, forming three electrical branch circuit; the first ends of coil one (21), coil three (23) and coil five (25) are connected together and connected to the voltage regulating tap circuit, coil two (22), coil four (24) and coil six ( The tail end of 26) is respectively connected to tap changer branch one (6), tap changer branch two (7) and tap changer branch three (8).