CN215578126U - Forced shunting balance transformer - Google Patents
Forced shunting balance transformer Download PDFInfo
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- CN215578126U CN215578126U CN202121682523.0U CN202121682523U CN215578126U CN 215578126 U CN215578126 U CN 215578126U CN 202121682523 U CN202121682523 U CN 202121682523U CN 215578126 U CN215578126 U CN 215578126U
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Abstract
The utility model relates to a forced shunt balance transformer, and belongs to the technical field of transformers. The technical scheme of the utility model is as follows: the inner winding and the outer winding (2) are respectively an inner winding and an outer winding and are jointly arranged on the core limb (1), 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 an upper lead (3) and a lower lead (3), the upper lead (4) of the inner winding is connected with the upper end of the inner winding and is connected with a voltage-regulating tapping loop, and the lower lead (5) of the outer winding is connected with the lower end of the outer winding and is respectively connected with a first tapping switch branch, a second tapping switch branch and a third tapping switch branch. 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.
Description
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 (3)
1. A forced shunt balance transformer is characterized in that: the winding comprises a core limb (1), inner and outer windings (2), an upper and lower connecting lead (3) of the inner and outer windings, an upper outgoing line (4) of the inner winding and a lower outgoing line (5) of the outer winding, wherein the inner and outer windings (2) are two windings which 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.
2. A forced shunt balancing transformer according to claim 1, wherein: the iron core columns (1) and the inner and outer windings (2) are respectively provided with two groups, and the iron core columns and the inner and outer windings are of a two-column iron core structure.
3. A forced shunt balancing transformer according to claim 1, wherein: 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 I (21) of the first iron core column is connected with the head end of an upper coil II (24), 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), the tail end of an upper coil V (25) 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 tail ends of the first coil (21), the third coil (23) and the fifth coil (25) are connected together and are connected with 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121682523.0U CN215578126U (en) | 2021-07-23 | 2021-07-23 | Forced shunting balance transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121682523.0U CN215578126U (en) | 2021-07-23 | 2021-07-23 | Forced shunting balance transformer |
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| Publication Number | Publication Date |
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| CN215578126U true CN215578126U (en) | 2022-01-18 |
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| CN202121682523.0U Active CN215578126U (en) | 2021-07-23 | 2021-07-23 | Forced shunting balance transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113611496A (en) * | 2021-07-23 | 2021-11-05 | 保定天威保变电气股份有限公司 | Forced shunting balance transformer |
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- 2021-07-23 CN CN202121682523.0U patent/CN215578126U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113611496A (en) * | 2021-07-23 | 2021-11-05 | 保定天威保变电气股份有限公司 | Forced shunting balance transformer |
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