CN114068156A - Improved grounding transformer used as substation transformer - Google Patents
Improved grounding transformer used as substation transformer Download PDFInfo
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- CN114068156A CN114068156A CN202111408952.3A CN202111408952A CN114068156A CN 114068156 A CN114068156 A CN 114068156A CN 202111408952 A CN202111408952 A CN 202111408952A CN 114068156 A CN114068156 A CN 114068156A
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- grounding transformer
- secondary side
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- tail end
- transformer
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- 238000004804 winding Methods 0.000 claims abstract description 92
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000007935 neutral effect Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 4
- 230000001629 suppression Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
Abstract
The invention relates to an improved grounding transformer which is also used as a station transformer, comprising a secondary side of the grounding transformer; the grounding transformer primary side is provided with six primary side windings A1, A2, B1, B2, C1 and C2 which are wound on a three-phase iron core, wherein two primary side windings are distributed on each iron core column of the three-phase iron core, and the number of turns of the two primary side windings is equal; six primary side windings are connected in a Z-shaped connection mode; the topological structure of the secondary side of the grounding transformer is the same as that of the primary side of the grounding transformer, and the two topological structures are symmetrical. The invention can achieve the low-voltage output phase voltage vector
Phase voltage vector to the high-voltage input-side mains voltage
In turn, respectively in phase.
Description
Technical Field
The invention relates to the field of transformers, in particular to an improved grounding transformer which is used as a station transformer.
Background
The circuit topology of the conventional grounding transformer doubling as a substation transformer is shown in patent document 201710544978.8, i.e. the structure of fig. 1.
The grounding transformer with the structure and serving as a station transformer has the advantages that only one winding is arranged on the secondary side of each iron core column, the output phase voltage differs from the phase voltage vector of the primary side by 30 degrees in sequence, and the low-voltage output phase voltage vector cannot be reached
Phase voltage vector to the high-voltage input-side mains voltage
In turn, respectively in phase.
Disclosure of Invention
The invention provides an improved grounding transformer which is used as a station transformer and can achieve low-voltage output phase voltage vector
Phase voltage vector to the high-voltage input-side mains voltage
In turn, respectively in phase.
To achieve the object, according to an aspect of the present invention, there is provided an improved grounding transformer doubling as a station transformer, comprising:
a secondary side of the grounding transformer;
the grounding transformer primary side is provided with six primary side windings A1, A2, B1, B2, C1 and C2 which are wound on a three-phase iron core, wherein two primary side windings are distributed on each iron core column of the three-phase iron core, and the number of turns of the two primary side windings is equal;
six primary side windings are connected in a Z-shaped connection mode;
the topological structure of the secondary side of the grounding transformer is the same as that of the primary side of the grounding transformer, and the two topological structures are symmetrical.
As an improvement, the wiring manner of the primary side of the grounding transformer further comprises:
the tail end of the primary winding A1 is connected with the tail end of the primary winding C2;
the tail end of the primary winding B1 is connected with the tail end of the primary winding A2;
the tail end of the primary side winding C1 is connected with the tail end of the primary side winding B2;
the head ends of the primary side windings A2, B2 and C2 are connected to form a neutral point N of a grounding transformer;
the head ends of the primary side windings A1, B1 and C1 are connected with a three-phase distribution network;
wherein, the end with the same name is the head end of the winding, and the other end is the tail end of the winding.
As an improvement, the wiring manner of the primary side of the grounding transformer further comprises:
the neutral point N is grounded through an arc suppression coil.
As an improved scheme, the secondary side of the grounding transformer is provided with six secondary side windings A3, A4, B3, B4, C3 and C4 which are wound on a three-phase iron core, wherein two secondary side windings are distributed on each iron core column of the three-phase iron core, and the number of turns of the two secondary side windings is equal;
six secondary side windings are also connected in a Z-shaped connection mode.
As an improvement, the wiring method of the secondary side of the grounding transformer further comprises:
the tail end of the secondary side winding A4 is connected with the tail end of the secondary side winding C3;
the tail end of the secondary side winding B4 is connected with the tail end of the secondary side winding A3;
the tail end of the secondary side winding C4 is connected with the tail end of the secondary side winding B3;
the head ends of the secondary side windings A3, B3 and C3 are connected to form a neutral point n of the grounding transformer;
and the head ends of the secondary side windings A4, B4 and C4 are used as low-voltage three-phase output ends.
As a modification, the number of turns Np of each of the primary windings is equal, and
the number of turns Ns of each secondary side winding is equal.
The improved grounding transformer serving as a station transformer is improved on the basis of the traditional grounding transformer and can realize low-voltage output phase voltage vector
Phase voltage vector to the high-voltage input-side mains voltage
In turn, respectively in phase.
The above description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the description and other objects, features, and advantages of the present invention more comprehensible.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like elements throughout the drawings.
In the drawings:
FIG. 1 is a circuit topology diagram of a modified grounding transformer of a conventional double-acting substation transformer;
FIG. 2 is a schematic structural diagram of an improved grounding transformer used as a station transformer according to the present invention;
fig. 3 is a circuit topology diagram of the improved grounding transformer of the invention which is also used as a station transformer.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Referring to fig. 2, it is a schematic structural diagram of the improved grounding transformer doubling as a substation of the present embodiment, and its circuit topology structure is shown in fig. 3, including a three-phase core, a secondary side of the grounding transformer, and a primary side of the grounding transformer.
The primary side of the grounding transformer is arranged to be composed of six primary side windings A1, A2, B1, B2, C1 and C2 wound on a three-phase iron core in order to lead out a neutral point N of a power distribution network, wherein two primary side windings are distributed on each iron core column of the three-phase iron core, and the number of turns of the two primary side windings is equal. For example, the primary sides of the a-phase core legs of the three-phase core are distributed from top to bottom as a1 and a2, and the numbers of turns of a1 and a2 are equal, and similarly, the B-phase core legs are distributed as B1 and B2, and the C-phase core legs are distributed as C1 and C2.
After the above distribution, the primary windings a1, a2, B1, B2, C1, and C2 are connected in series in opposite polarity to form a star winding, that is, connected in a Z-connection manner, specifically, the connection manner of the primary side of the grounding transformer is further set as follows:
the tail end of the primary winding A1 is connected with the tail end of the primary winding C2;
the tail end of the primary winding B1 is connected with the tail end of the primary winding A2;
the tail end of the primary side winding C1 is connected with the tail end of the primary side winding B2;
the head ends of the primary side windings A2, B2 and C2 are connected to form a neutral point N of a grounding transformer;
the head ends of the primary side windings A1, B1 and C1 are connected with a three-phase distribution network.
In fig. 3, the origin point beside the winding is used to represent the end of the same name, the end of the same name is the head end of the winding, and the other end is called the tail end.
In this embodiment, in order to eliminate the electrical angle difference between the output phase voltage and the primary phase voltage vector in turn by 30 degrees, the topology of the secondary side of the grounding transformer is set to be the same as the topology of the primary side of the grounding transformer, and the two are symmetrical to each other.
Specifically, the secondary side of the grounding transformer is composed of six secondary side windings A3, a4, B3, B4, C3 and C4 wound on a three-phase iron core, wherein two secondary side windings are distributed on each iron core column of the three-phase iron core, and the number of turns of the two secondary side windings is equal. For example, the secondary sides of the core legs of the phase a of the three-phase iron core are distributed from top to bottom with A3 and a4, A3 and a4 having the same number of turns, and similarly, the core legs of the phase B are distributed with B3 and B4, and the core legs of the phase C are distributed with C3 and C4.
For the secondary side of the grounding transformer, A3, a4, B3, B4, C3 and C4 are connected in series in reverse polarity to form a star winding, namely, the connection mode is performed in a Z-shaped connection mode, specifically, the connection mode of the secondary side of the grounding transformer is further set as follows:
the tail end of the secondary side winding A4 is connected with the tail end of the secondary side winding C3;
the tail end of the secondary side winding B4 is connected with the tail end of the secondary side winding A3;
the tail end of the secondary side winding C4 is connected with the tail end of the secondary side winding B3;
the head ends of the secondary side windings A3, B3 and C3 are connected to form a neutral point n of the grounding transformer;
and the head ends of the secondary side windings A4, B4 and C4 are used as low-voltage three-phase output ends.
The improved grounding transformer serving as a station transformer provided by the embodiment is improved on the basis of the traditional grounding transformer, and can realize a low-voltage output phase voltage vector
Phase voltage vector to the high-voltage input-side mains voltage
In turn, respectively in phase.
In an alternative embodiment, the primary side of the grounding transformer is further wired in such a way that the neutral point N is grounded via a crowbar coil for compensating for a substantial part of the capacitive reactive current flowing through the ground fault point.
As another optional implementation, in the arrangement of the number of turns, the number of turns Np of each primary winding is equal, and the number of turns Ns of each secondary winding is equal, so that the improved grounding transformer serving as a substation transformer provided by this embodiment forms a fully symmetric structure, and the reliability and the working stability of the grounding transformer can be improved.
In this alternative embodiment, assuming that the number of turns of each winding on the primary side is Np, the number of turns on the low-voltage output side is Ns, and the turn ratio k is Np/Ns, the following vector relationship can be obtained by neglecting the leakage inductance influence according to the relationships between the connection lines and the windings dotted ends in fig. 2 and 3:
that is, the secondary side output phase voltage corresponds to the same phase as the primary side, and the amplitude thereof is 1/k times of the phase corresponding to the primary side.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Claims (6)
1. An improved grounding transformer doubling as a station transformer, comprising:
a secondary side of the grounding transformer;
the grounding transformer primary side is provided with six primary side windings A1, A2, B1, B2, C1 and C2 which are wound on a three-phase iron core, wherein two primary side windings are distributed on each iron core column of the three-phase iron core, and the number of turns of the two primary side windings is equal;
the method is characterized in that:
six primary side windings are connected in a Z-shaped connection mode;
the topological structure of the secondary side of the grounding transformer is the same as that of the primary side of the grounding transformer, and the two topological structures are symmetrical.
2. The station-compatible improved grounding transformer as claimed in claim 1, wherein the primary side of the grounding transformer is wired further comprising:
the tail end of the primary winding A1 is connected with the tail end of the primary winding C2;
the tail end of the primary winding B1 is connected with the tail end of the primary winding A2;
the tail end of the primary side winding C1 is connected with the tail end of the primary side winding B2;
the head ends of the primary side windings A2, B2 and C2 are connected to form a neutral point N of a grounding transformer;
the head ends of the primary side windings A1, B1 and C1 are connected with a three-phase distribution network;
wherein, the end with the same name is the head end of the winding, and the other end is the tail end of the winding.
3. The station-compatible improved grounding transformer as claimed in claim 2, wherein the primary side of the grounding transformer is wired further comprising:
the neutral point N is grounded through an arc suppression coil.
4. The station transformer improved grounding transformer as recited in claim 2,
the secondary side of the grounding transformer is provided with six secondary side windings A3, A4, B3, B4, C3 and C4 which are wound on a three-phase iron core, wherein each iron core column of the three-phase iron core is distributed with two secondary side windings, and the number of turns of the two secondary side windings is equal;
six secondary side windings are also connected in a Z-shaped connection mode.
5. The station-compatible improved grounding transformer as claimed in claim 4, wherein the wiring of the secondary side of the grounding transformer further comprises:
the tail end of the secondary side winding A4 is connected with the tail end of the secondary side winding C3;
the tail end of the secondary side winding B4 is connected with the tail end of the secondary side winding A3;
the tail end of the secondary side winding C4 is connected with the tail end of the secondary side winding B3;
the head ends of the secondary side windings A3, B3 and C3 are connected to form a neutral point n of the grounding transformer;
and the head ends of the secondary side windings A4, B4 and C4 are used as low-voltage three-phase output ends.
6. The station transformer improved grounding transformer as recited in claim 4,
the number of turns Np of each of the primary windings is equal, an
The number of turns Ns of each secondary side winding is equal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111408952.3A CN114068156A (en) | 2021-11-19 | 2021-11-19 | Improved grounding transformer used as substation transformer |
| PCT/CN2021/136751 WO2023087435A1 (en) | 2021-11-19 | 2021-12-09 | Improved grounding transformer doubling as station transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111408952.3A CN114068156A (en) | 2021-11-19 | 2021-11-19 | Improved grounding transformer used as substation transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114068156A true CN114068156A (en) | 2022-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111408952.3A Pending CN114068156A (en) | 2021-11-19 | 2021-11-19 | Improved grounding transformer used as substation transformer |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114068156A (en) |
| WO (1) | WO2023087435A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06310349A (en) * | 1993-04-22 | 1994-11-04 | Daihen Corp | Three-phase transformer |
| CN202977126U (en) * | 2012-11-09 | 2013-06-05 | 浙江科润电力设备有限公司 | Power transformer winding structure for eliminating harmonic wave |
| CN103632816A (en) * | 2012-08-22 | 2014-03-12 | 重庆市帝迅电气科技有限公司 | High-lightning-resistant power transformer and dry or oil-immersed power transformer including same |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB595166A (en) * | 1945-06-06 | 1947-11-27 | Foster Transformers & Switchge | Improvements in electric transformers |
| CN201504101U (en) * | 2009-08-10 | 2010-06-09 | 李长益 | Integral grounding transformator and arc extinction coil device |
| CN102169749B (en) * | 2011-01-26 | 2013-02-13 | 中电电气(江苏)股份有限公司 | Low-zero-sequence-resistance slow-harmonic energy-saving transformer |
| CN104361982B (en) * | 2014-10-24 | 2016-12-07 | 南京航空航天大学 | A kind of 12 pulse wave self coupling phase-shifting rectifier transformers |
| CN105807137A (en) * | 2014-12-29 | 2016-07-27 | 国家电网公司 | Grounding transformer impedance determining method |
| CN111181146A (en) * | 2020-02-26 | 2020-05-19 | 安徽一天电气技术股份有限公司 | Arc suppression system and method |
-
2021
- 2021-11-19 CN CN202111408952.3A patent/CN114068156A/en active Pending
- 2021-12-09 WO PCT/CN2021/136751 patent/WO2023087435A1/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06310349A (en) * | 1993-04-22 | 1994-11-04 | Daihen Corp | Three-phase transformer |
| CN103632816A (en) * | 2012-08-22 | 2014-03-12 | 重庆市帝迅电气科技有限公司 | High-lightning-resistant power transformer and dry or oil-immersed power transformer including same |
| CN202977126U (en) * | 2012-11-09 | 2013-06-05 | 浙江科润电力设备有限公司 | Power transformer winding structure for eliminating harmonic wave |
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| Publication number | Publication date |
|---|---|
| WO2023087435A1 (en) | 2023-05-25 |
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