CN111540594A - Ultrahigh-voltage high-capacity phase-shifting transformer and structural arrangement method thereof - Google Patents
Ultrahigh-voltage high-capacity phase-shifting transformer and structural arrangement method thereof Download PDFInfo
- Publication number
- CN111540594A CN111540594A CN202010511296.9A CN202010511296A CN111540594A CN 111540594 A CN111540594 A CN 111540594A CN 202010511296 A CN202010511296 A CN 202010511296A CN 111540594 A CN111540594 A CN 111540594A
- Authority
- CN
- China
- Prior art keywords
- phase
- winding
- voltage
- unit
- excitation unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/16—Cascade transformers, e.g. for use with extra high tension
-
- 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
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/12—Two-phase, three-phase or polyphase transformers
- H01F30/14—Two-phase, three-phase or polyphase transformers for changing the number of phases
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The invention relates to an ultrahigh-voltage high-capacity phase-shifting transformer and a structural arrangement method thereof, belonging to the technical field of power transmission and transformation manufacturing. The technical scheme of the invention is as follows: in each single-phase-shifting transformer (1), a single-phase series unit winding (6) is sleeved on a single-phase series unit iron core (5) to form a single-phase series unit; a single-phase excitation unit winding (8) is sleeved on the single-phase excitation unit iron core (7) to form a single-phase excitation unit, and a voltage regulating winding of the single-phase excitation unit winding is connected with an on-load tap-changer (9); the high-voltage winding of the single-phase series unit winding and the high-voltage winding of the single-phase excitation unit winding are connected inside each single-phase-shifting transformer (1), and the low-voltage winding of the single-phase series unit winding is connected with the on-load tap-changer through a choke (2). The invention can effectively reduce the size of the single phase-shifting transformer, realize the design requirement of phase shifting and changing with extra large capacity, solve the limitation of the size of the switch-level capacity and effectively improve the reliability and the economical efficiency of phase shifting and changing.
Description
Technical Field
The invention relates to an ultrahigh-voltage high-capacity phase-shifting transformer and a structural arrangement method thereof, belonging to the technical field of power transmission and transformation manufacturing.
Background
With the continuous deepening of the market-oriented reformation of the electric power system in China, the connection between large-area power grids is tighter, particularly, under the environments of extra-high voltage alternating current-direct current hybrid connection, large-scale new energy centralized access and the like, the trend of the electric power system after networking presents a natural distribution characteristic, and has great randomness in space-time distribution, so that the regulation and control difficulty is increased. The controllable phase-shifting transformer is additionally arranged in the large power grid, the power flow distribution of the power system can be controlled, the transmission capacity of a key section can be effectively improved, the unbalanced situation of the power flow distribution is relieved, the smoothness of a power transmission network is ensured, and the problems of electromagnetic circulation and the like can be effectively controlled.
With the increase of the transmission capacity and voltage of a power grid, the development of an ultrahigh-voltage super-large-capacity phase-shifting transformer becomes a bottleneck for restricting the stability of the power grid, and the existing phase-shifting structure cannot meet the design and production requirements.
1. The highest voltage grade of the choke and the corrugated grid applied to the large phase-shifting transformer is 330kV grade at present, and the requirement of 500kV and above ultrahigh voltage grade cannot be met.
2. The capacity of the large phase-shifting transformer is limited by the transportation size and weight.
3. Because the maximum stage voltage and the stage capacity of the on-load tap-changer have upper limits, the ultrahigh voltage phase-shifting transformer with extra large capacity is restricted.
Disclosure of Invention
The invention aims to provide an ultrahigh-voltage high-capacity phase-shifting transformer and a structural arrangement method thereof, wherein a three-phase double-body phase-shifting transformer is changed into a three-phase-shifting transformer group, so that the size of a single phase-shifting transformer can be effectively reduced, and the design requirement of phase change of extra-large capacity is met; the series unit and the excitation unit of each phase of the three-phase transformer bank can be respectively of a two-column (or three-column) parallel structure, so that the corresponding on-load tap-changers can be respectively corresponding to two (or three) on-load tap-changers, and the limitation of the switch-level capacity is solved; the connecting wire of the choke is a low-voltage and voltage-regulating winding lead wire, the high-voltage winding lead wire is connected in each transformer, and the ultrahigh-voltage phase-shifting design can be completed by adopting a corrugated grid with a much lower insulation level; the phase shift circuit has high reliability and low manufacturing cost, can effectively improve the reliability and the economical efficiency of phase shift change, and effectively solves the problems in the prior art.
The technical scheme of the invention is as follows: an ultrahigh voltage high-capacity phase-shifting transformer comprises three single-phase-shifting transformers, wherein the single-phase-shifting transformers are connected through a choke junction to form a three-phase-shifting transformer bank; each single-phase-shifting transformer comprises a single-phase series unit iron core and a single-phase excitation unit iron core; the single-phase series unit winding is sleeved on the single-phase series unit iron core to form a single-phase series unit, and the head end and the tail end of a high-voltage winding of the single-phase series unit winding are respectively connected with a single-phase series unit power supply side lead and a single-phase series unit load side lead; the single-phase excitation unit winding is sleeved on the single-phase excitation unit iron core to form a single-phase excitation unit, and a voltage regulating winding of the single-phase excitation unit winding is connected with the on-load tap-changer; the high-voltage winding of the single-phase series unit winding and the high-voltage winding of the single-phase excitation unit winding are connected inside each single-phase-shifting transformer, and the low-voltage winding of the single-phase series unit winding and the single-phase excitation unit on-load tap-changer are connected through a choke.
The single-phase series unit and the single-phase excitation unit are in a parallel two-column structure, and two on-load tap changers are correspondingly connected with the single-phase excitation unit.
The single-phase series unit and the single-phase excitation unit are in a parallel three-column structure, and three on-load tap changers correspondingly connected with the single-phase excitation unit are provided.
The larynx knot is the flexible pipeline of establishing the lead wire bundle in, and both ends are equipped with the plug-in and pull-out head of high-speed joint to be equipped with insulation protection.
A structural arrangement method of an extra-high voltage high-capacity phase-shifting transformer comprises the following steps: firstly, a phase-shifting transformer of a three-phase double-transformer body is changed into a three-phase-shifting transformer group; each phase-shifting transformer comprises a single-phase series unit iron core and a single-phase excitation unit iron core, a single-phase series unit winding is sleeved on the single-phase series unit iron core to form a single-phase series unit, and the single-phase series unit winding comprises a high-voltage winding and a low-voltage winding; the single-phase excitation unit winding is sleeved on the single-phase excitation unit iron core to form a single-phase excitation unit, and comprises an inner high-voltage winding, an outer high-voltage winding and a voltage regulating winding; placing an on-load tap-changer at the side of the iron core winding of the single-phase excitation unit, wherein the single-phase excitation unit is provided with two or three parallel columns, and a voltage regulating coil of each column is connected with one on-load tap-changer, so that the forced shunt of the on-load tap-changer is automatically realized; the high-voltage winding of the single-phase series unit and the high-voltage winding of the single-phase excitation unit are directly connected inside each phase transformer, the low-voltage winding of the single-phase series unit and the voltage regulating winding of the single-phase excitation unit are connected through a choke, and the connecting wire of the choke is a low-voltage and voltage regulating winding lead wire, so that the ultrahigh-voltage phase shift design can be completed by adopting a corrugated grid with a low insulation level.
The invention has the beneficial effects that: the phase-shifting transformer with the three-phase double-transformer body is changed into a three-phase-shifting transformer group, so that the size of the single phase-shifting transformer can be effectively reduced, and the design requirement of phase shifting and phase changing with extra large capacity is met; the series unit and the excitation unit of each phase of the three-phase transformer bank can be respectively of a two-column or three-column parallel structure, so that the corresponding on-load tap-changer can be respectively correspondingly two or three, and the limitation of the switch-level capacity is solved; the connecting wire of the choke is a low-voltage and voltage-regulating winding lead wire, the high-voltage winding lead wire is connected in each transformer, and the ultrahigh-voltage phase-shifting design can be completed by adopting a corrugated grid with a much lower insulation level; the reliability is high, and low in manufacturing cost can effectively promote to move reliability and the economic nature of phase transition.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a wiring schematic of the present invention;
FIG. 3 is a schematic wiring diagram of the present invention;
FIG. 4 is a wiring diagram of the present invention;
in the figure: the single-phase-shifting transformer comprises a single-phase-shifting transformer 1, a choke 2, a single-phase series unit power supply side lead 3, a single-phase series unit load side lead 4, a single-phase series unit iron core 5, a single-phase series unit winding 6, a single-phase excitation unit iron core 7, a single-phase excitation unit winding 8, an on-load tap-changer 9, a power supply side 10 and a load side 11.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and examples.
An ultra-high voltage high-capacity phase-shifting transformer comprises three single-phase-shifting transformers 1, wherein the single-phase-shifting transformers 1 are connected through a choke junction 2 to form a three-phase-shifting transformer bank; each single-phase-shifting transformer 1 comprises a single-phase series unit iron core 5 and a single-phase excitation unit iron core 7; the single-phase series unit winding 6 is sleeved on the single-phase series unit iron core 5 to form a single-phase series unit, and the head end and the tail end of a high-voltage winding of the single-phase series unit winding 6 are respectively connected with a single-phase series unit power supply side lead 3 and a single-phase series unit load side lead 4; a single-phase excitation unit winding 8 is sleeved on the single-phase excitation unit iron core 7 to form a single-phase excitation unit, and a voltage regulating winding of the single-phase excitation unit winding 8 is connected with an on-load tap-changer 9; the high-voltage winding of the single-phase series unit winding 6 and the high-voltage winding of the single-phase excitation unit winding 8 are connected inside each single-phase-shifting transformer 1, and the low-voltage winding of the single-phase series unit winding 6 is connected with the on-load tap-changer 9 through the choke 2.
The single-phase series unit and the single-phase excitation unit are in a parallel two-column structure, and two on-load tap changers are correspondingly connected with the single-phase excitation unit.
The single-phase series unit and the single-phase excitation unit are in a parallel three-column structure, and three on-load tap changers correspondingly connected with the single-phase excitation unit are provided.
A structural arrangement method of an extra-high voltage high-capacity phase-shifting transformer comprises the following steps: firstly, a phase-shifting transformer of a three-phase double-transformer body is changed into a three-phase-shifting transformer group; each phase-shifting transformer comprises a single-phase series unit iron core and a single-phase excitation unit iron core, a single-phase series unit winding is sleeved on the single-phase series unit iron core to form a single-phase series unit, and the single-phase series unit winding comprises a high-voltage winding and a low-voltage winding; the single-phase excitation unit winding is sleeved on the single-phase excitation unit iron core to form a single-phase excitation unit, and comprises an inner high-voltage winding, an outer high-voltage winding and a voltage regulating winding; placing an on-load tap-changer at the side of the iron core winding of the single-phase excitation unit, wherein the single-phase excitation unit is provided with two (or three) parallel columns, and a voltage regulating coil of each column is connected with one on-load tap-changer, so that the forced shunt of the on-load tap-changer is automatically realized; the high-voltage winding of the single-phase series unit and the high-voltage winding of the single-phase excitation unit are directly connected inside each phase transformer, the low-voltage winding of the single-phase series unit and the voltage regulating winding of the single-phase excitation unit are connected through a choke, and the connecting wire of the choke is a low-voltage and voltage regulating winding lead wire, so that the ultrahigh-voltage phase shift design can be completed by adopting a corrugated grid with a low insulation level.
In practical application, a three-phase double-body combined structure of a series transformer and an exciting transformer of a traditional phase-shifting transformer is changed into a three-single-phase-shifting transformer combined structure, each single-phase-shifting transformer comprises a single-phase series unit iron core and a single-phase exciting unit iron core, and high-voltage windings and low-voltage windings are placed on the single-phase series unit iron cores to form a single-phase series unit; an inner high-voltage winding, an outer high-voltage winding and a voltage regulating winding are arranged on the iron core of the single-phase excitation unit to form the single-phase excitation unit. And an on-load tap-changer is arranged on the side of the iron core winding of the single-phase excitation unit. The single-phase excitation unit is provided with two (or three) parallel columns, a voltage regulating coil of each column is connected with an on-load tap changer so as to automatically realize the forced shunt of the on-load tap changer, a high-voltage winding of a single-phase series unit and a high-voltage winding of the single-phase excitation unit are directly connected in the single-phase-shifting transformer of each phase, and a low-voltage winding of the single-phase series unit and a voltage regulating winding of the single-phase excitation unit are connected through a throat junction.
In the third phase, each series unit and each excitation unit are equally divided into two paths and are respectively arranged on two iron core columns of the iron core of the series unit and the iron core of the excitation unit, wherein:
SA1, SA2 and SA3 are heads of three-phase low-voltage windings of the first branch series unit 1,2 and 3(A, B and C);
SB1, SB2 and SB3 are heads of three-phase low-voltage windings of the second branch series unit 1,2 and 3(A, B and C);
SAA1, SAA2 and SAA3 are the tail ends of three-phase low-voltage windings of 1,2 and 3(A, B and C) of a first branch series unit;
SBB1, SBB2 and SBB3 are the tail ends of the three-phase low-voltage windings of the 1,2 and 3(A, B and C) series units of the second branch circuit;
EA1, EA2 and EA3 are ports of three-phase voltage-regulating windings of the first branch excitation unit 1,2 and 3(A, B and C);
EB1, EB2 and EB3 are ports of three-phase voltage-regulating windings of the second branch excitation unit 1,2 and 3(A, B and C);
no 1, No 2 and No 3 are neutral points of three-phase voltage regulating windings of two-way excitation units 1,2 and 3(A, B and C).
Claims (4)
1. An ultrahigh voltage high-capacity phase-shifting transformer is characterized in that: the transformer comprises three single-phase-shifting transformers (1), wherein the single-phase-shifting transformers (1) are connected through a choke (2) to form a three-phase-shifting transformer bank; each single-phase-shifting transformer (1) comprises a single-phase series unit iron core (5) and a single-phase excitation unit iron core (7); the single-phase series unit winding (6) is sleeved on the single-phase series unit iron core (5) to form a single-phase series unit, and the head end and the tail end of a high-voltage winding of the single-phase series unit winding (6) are respectively connected with a single-phase series unit power supply side lead (3) and a single-phase series unit load side lead (4); a single-phase excitation unit winding (8) is sleeved on the single-phase excitation unit iron core (7) to form a single-phase excitation unit, and a voltage regulating winding of the single-phase excitation unit winding (8) is connected with an on-load tap switch (9); the high-voltage winding of the single-phase series unit winding (6) and the high-voltage winding of the single-phase excitation unit winding (8) are connected inside each single-phase-shifting transformer (1), and the low-voltage winding of the single-phase series unit winding (6) is connected with the on-load tap-changer (9) through the choke (2).
2. The ultra-high voltage high capacity phase-shifting transformer of claim 1, wherein: the single-phase series unit and the single-phase excitation unit are in a parallel two-column structure, and two on-load tap-changers (9) are correspondingly connected with the single-phase excitation unit.
3. The ultra-high voltage high capacity phase-shifting transformer of claim 1, wherein: the single-phase series unit and the single-phase excitation unit are in a parallel three-column structure, and three on-load tap-changers (9) are correspondingly connected with the single-phase excitation unit.
4. A structural arrangement method of an extra-high voltage high-capacity phase-shifting transformer is characterized by comprising the following steps: firstly, a phase-shifting transformer of a three-phase double-transformer body is changed into a three-phase-shifting transformer group; each phase-shifting transformer comprises a single-phase series unit iron core and a single-phase excitation unit iron core, a single-phase series unit winding is sleeved on the single-phase series unit iron core to form a single-phase series unit, and the single-phase series unit winding comprises a high-voltage winding and a low-voltage winding; the single-phase excitation unit winding is sleeved on the single-phase excitation unit iron core to form a single-phase excitation unit, and comprises an inner high-voltage winding, an outer high-voltage winding and a voltage regulating winding; placing an on-load tap-changer (9) at the winding side of the single-phase excitation unit iron core (7), wherein the single-phase excitation unit is provided with two or three parallel columns, and the voltage regulating coil of each column is connected with an on-load tap-changer, so that the forced shunting of the on-load tap-changer is automatically realized; the high-voltage winding of the single-phase series unit and the high-voltage winding of the single-phase excitation unit are directly connected inside each phase transformer, the low-voltage winding of the single-phase series unit and the voltage regulating winding of the single-phase excitation unit are connected through a choke, and the connecting wire of the choke is a low-voltage and voltage regulating winding lead wire, so that the ultrahigh-voltage phase shift design can be completed by adopting a corrugated grid with a low insulation level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010511296.9A CN111540594A (en) | 2020-06-08 | 2020-06-08 | Ultrahigh-voltage high-capacity phase-shifting transformer and structural arrangement method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010511296.9A CN111540594A (en) | 2020-06-08 | 2020-06-08 | Ultrahigh-voltage high-capacity phase-shifting transformer and structural arrangement method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111540594A true CN111540594A (en) | 2020-08-14 |
Family
ID=71979864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010511296.9A Pending CN111540594A (en) | 2020-06-08 | 2020-06-08 | Ultrahigh-voltage high-capacity phase-shifting transformer and structural arrangement method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111540594A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924830A (en) * | 2021-03-04 | 2021-06-08 | 国网山西省电力公司电力科学研究院 | Transformer three-phase partial discharge simultaneous pressurization test device and test method based on single-phase variable frequency power supply |
-
2020
- 2020-06-08 CN CN202010511296.9A patent/CN111540594A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924830A (en) * | 2021-03-04 | 2021-06-08 | 国网山西省电力公司电力科学研究院 | Transformer three-phase partial discharge simultaneous pressurization test device and test method based on single-phase variable frequency power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20230356629A1 (en) | System for implementing continuous co-phase flexible alternating current traction power supply and operation mode therefor | |
| CN206497818U (en) | Novel magnetic control reactor | |
| CN203351361U (en) | Dual-split epoxy resin insulation dry-type boosting transformer used for wind power and photovoltaic power generation | |
| CN111540594A (en) | Ultrahigh-voltage high-capacity phase-shifting transformer and structural arrangement method thereof | |
| US11587719B2 (en) | Magnetic integrated hybrid distribution transformer | |
| CN211957423U (en) | Arrangement structure of ultrahigh-voltage high-capacity phase-shifting transformer | |
| CN102592810A (en) | AC (alternating current) phase-changing transformer and power transmission method thereof | |
| CN215578126U (en) | Forced shunting balance transformer | |
| CN114530318A (en) | Core type controllable reactor | |
| CN211719403U (en) | +/-500 kV flexible direct current converter transformer with valve sleeve arranged outdoors | |
| CN209297901U (en) | A kind of tractive transformer | |
| CN208077752U (en) | A kind of tractive transformer | |
| CN109741924B (en) | Traction transformer | |
| CN212136227U (en) | Single-oil-tank extra-high voltage autotransformer suitable for extra-high voltage alternating current transformer substation | |
| CN112768209A (en) | Three-phase-shifting transformer | |
| CN112821403A (en) | Single-phase or three-phase electromagnetic series-connection type power transmission line power flow control topological circuit | |
| CN208939589U (en) | A kind of on-load regulator transformer and Unified Power Flow control system | |
| CN103337335B (en) | Zero sequence filtering electricity-saving appliance | |
| CN101964247B (en) | Combining and traction transformer of two low-voltage winding layers for AT (Automatic Transmission) power supply | |
| CN111446074A (en) | Transformer device | |
| CN207367763U (en) | Ocean platform changes input Multiple coil dry-type transformer with 6-10kV twin voltages | |
| CN113496809A (en) | Vx of single-body structure connects 220kV traction transformer | |
| CN202093954U (en) | Phase-shift rectifier transformer and serial-connection topology frequency converter | |
| CN201975222U (en) | Asymmetrical wiring balanced transformer | |
| CN212010684U (en) | Transformer device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |