CN216773015U - Three-phase dry type transformer bank - Google Patents
Three-phase dry type transformer bank Download PDFInfo
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- CN216773015U CN216773015U CN202220200421.9U CN202220200421U CN216773015U CN 216773015 U CN216773015 U CN 216773015U CN 202220200421 U CN202220200421 U CN 202220200421U CN 216773015 U CN216773015 U CN 216773015U
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Abstract
The utility model discloses a three-phase dry type transformer bank, comprising: three double-column single-phase dry-type transformers; each double-column single-phase dry-type transformer comprises: the primary coil, the secondary coil and the stabilizing coil are arranged on each iron core column; the primary coils of the three double-column single-phase dry-type transformers adopt a star connection method, and the secondary coils adopt a star yn connection method; the stabilizing coils of the three double-column single-phase dry-type transformers are coupled with the secondary coil and connected in a triangular mode. When three-phase load is unbalanced, zero sequence current can pass through the secondary coils of three double-column single-phase dry-type transformers, zero sequence magnetic flux is generated in the iron core, zero sequence current circulating current is induced in the delta connection stable coils, reverse zero sequence magnetic flux with the same size is generated in the iron core, therefore, zero sequence magnetic flux is not generated in the main magnetic circuit of the iron core, zero sequence potential is not induced in the primary coil, and adverse effect of the zero sequence current on a power grid can be effectively inhibited.
Description
Technical Field
The utility model relates to the technical field of power systems, in particular to a three-phase dry type transformer bank.
Background
A transformer is a device that changes an alternating voltage using the principle of electromagnetic induction. The method has wide application in power conversion systems in the fields of wind power generation, photovoltaic power generation, urban rail transit traction rectification, ship electric propulsion and the like, wherein in the power conversion systems, a power supply grid is connected with a converter through a transformer.
The present three-phase transformer set, such as a three-phase dry transformer set, is generally formed by three single-phase dry transformers connected by Dyn or YNd. In some application scenarios of the three-phase transformer, the three-phase transformer needs to be led out from a neutral point, a primary coil of the three-phase transformer needs to be connected as a star Y, and a secondary coil of the three-phase transformer needs to be connected as a star yn. However, when three-phase load is unbalanced, the neutral line has higher zero sequence current, which causes neutral point shift; moreover, the high zero-sequence current also induces a high zero-sequence potential in the primary coil, causing voltage waveform distortion.
SUMMERY OF THE UTILITY MODEL
The utility model provides a three-phase dry type transformer bank which can reduce the adverse effect of zero-sequence current on a power grid.
In order to achieve the purpose, the utility model provides the following technical scheme:
a three-phase dry-type transformer bank, comprising: three double-column single-phase dry-type transformers; wherein:
each double-column single-phase dry-type transformer comprises: the primary coil, the secondary coil and the stabilizing coil are arranged on the first iron core column, and the primary coil, the secondary coil and the stabilizing coil are arranged on the second iron core column;
primary coils of the three double-column single-phase dry-type transformers are connected by adopting a star connection method; the secondary coils of the three double-column single-phase dry-type transformers are connected by adopting a star yn connection method; the stabilizing coils of the three double-column single-phase dry-type transformers are coupled with the secondary coils of the three double-column single-phase dry-type transformers, and the stabilizing coils of the three double-column single-phase dry-type transformers are connected by adopting a delta connection method.
In some embodiments, the stabilizing coil of the three dual-pole single-phase dry-type transformers is coupled to the secondary coil of the three dual-pole single-phase dry-type transformers, and comprises:
aiming at each double-column single-phase dry-type transformer, a secondary coil on the first iron core column and a stable coil on the first iron core column are in a close magnetic coupling relationship; and the secondary coil on the second iron core column and the stabilizing coil on the second iron core column are in close magnetic coupling relationship.
In some embodiments, for each dual-limb single-phase dry-type transformer, the homonymous end of the primary coil of the first core limb and the homonymous end of the primary coil of the second core limb are connected to form a primary terminal; the non-homonymous end of the primary coil of the first iron leg and the non-homonymous end of the primary coil of the second iron leg are connected to form a primary terminal tail end;
the primary terminals of the three double-column single-phase dry-type transformers are used for connecting a power grid, and the tail ends of the primary terminals of the three double-column single-phase dry-type transformers are connected in a star connection mode.
In some embodiments, for each dual-limb single-phase dry-type transformer, the homonymous end of the secondary coil of the first core limb and the homonymous end of the secondary coil of the second core limb are connected to form a secondary terminal; the non-homonymous end of the secondary coil of the first iron leg and the non-homonymous end of the secondary coil of the second iron leg are connected to form a secondary terminal tail end;
the tail ends of secondary terminals of the three double-column single-phase dry-type transformers are connected by adopting a star yn connection method, and the secondary terminals of the three double-column single-phase dry-type transformers are connected with electrical equipment.
In some embodiments, for each double-column single-phase dry-type transformer, the homonymous end of the stabilizing coil of the first core column and the homonymous end of the stabilizing coil of the second core column are connected to form a stabilizing coil head end terminal; the non-homonymous end of the stabilizing coil of the first iron leg and the non-homonymous end of the stabilizing coil of the second iron leg are connected to form a stabilizing coil terminal;
the head end terminal and the tail end terminal of the stabilizing coil of the three double-column single-phase dry-type transformers are connected by adopting a delta connection method.
In some embodiments, the stabilizing coil end terminal of the first twin-pole single-phase dry-type transformer is connected with the stabilizing coil head end terminal of the second twin-pole single-phase dry-type transformer; the tail end terminal of the stabilizing coil of the second double-column single-phase dry-type transformer is connected with the head end terminal of the stabilizing coil of the third double-column single-phase dry-type transformer; and the tail end terminal of the stabilizing coil of the third double-column single-phase dry-type transformer is connected with the head end terminal of the stabilizing coil of the first double-column single-phase dry-type transformer.
In some embodiments, the first core leg and the second core leg are rectangular frame core legs.
In some embodiments, the dual-column single-phase dry-type transformer further comprises: a housing, a cooling system, and a protective device.
In some embodiments, the secondary coils of the three double-column single-phase dry-type transformers are connected by a star yn connection method.
According to the technical scheme, the stabilizing coils of the three double-column single-phase dry-type transformers are coupled with the secondary coils of the three double-column single-phase dry-type transformers, and the stabilizing coils of the three double-column single-phase dry-type transformers are connected in a delta connection mode. When three-phase load is unbalanced, zero sequence current can pass through the secondary coils of three double-column single-phase dry-type transformers, zero sequence magnetic flux is generated in the iron core, zero sequence current circulating current is induced in the delta connection stable coils, reverse zero sequence magnetic flux with the same size is generated in the iron core, therefore, zero sequence magnetic flux is not generated in the main magnetic circuit of the iron core, zero sequence potential is not induced in the primary coil, and adverse effect of the zero sequence current on a power grid can be effectively inhibited.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1a is a schematic structural diagram of a single-phase dry-type transformer according to an embodiment of the present invention;
fig. 1b is a schematic structural diagram of a single-phase dry-type transformer according to an embodiment of the present invention;
fig. 1c is a schematic diagram of a core leg and a coil of a single-phase dry-type transformer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a Yyn0+ d three-phase dry type transformer bank according to the embodiment of the utility model;
fig. 3 is a schematic connection diagram of a Yyn0+ d three-phase dry type transformer bank disclosed in the embodiment of the present invention;
fig. 4 is a potential phasor diagram of a Yyn0+ d three-phase dry type transformer bank disclosed by the embodiment of the utility model;
fig. 5 is a zero-sequence current and zero-sequence magnetic potential diagram of a Yyn0+ d three-phase dry-type transformer bank disclosed in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The utility model provides a three-phase dry type transformer bank which can reduce the adverse effect of zero-sequence current on a power grid.
Fig. 1a, 1b and 1c show a single-phase dry-type transformer. This single-phase dry-type transformer belongs to the single-phase dry-type transformer of twin columns, includes:
a first leg core 1001;
a second core leg 1002;
a first primary coil 1003 disposed on the first leg core 1001;
a second primary coil 1004 provided on the second core limb 1002;
a first secondary coil 1005 disposed on the first leg core 1001;
a second secondary coil 1006 disposed on the second core limb 1002;
a first stabilizing coil 1007 provided on the first core limb 1001;
and a second stabilizing coil 1008 provided on the second core limb 1002.
In some embodiments, the first leg core 1001 and the second leg core 1002 may be rectangular frame cores. The first secondary winding 1005 and the second stabilizing winding 1007 are in close magnetic coupling relationship. The first secondary winding 1006 is in close magnetic coupling relationship with the second stabilizing winding 1008.
Based on the single-phase dry-type transformer provided in the foregoing, another embodiment of the present application provides a three-phase dry-type transformer bank, where the three-phase dry-type transformer bank includes three double-limb single-phase dry-type transformers, and the three double-limb single-phase dry-type transformers adopt a Yyn0+ d connection manner.
The three-phase dry-type transformer bank provided by the embodiment of the application is shown in fig. 2 and comprises: a first dual-limb single-phase dry transformer 2010, a second dual-limb single-phase dry transformer 2020, and a third dual-limb single-phase dry transformer 2030.
Wherein: a first dual-limb single-phase dry transformer 2010, comprising: a first core leg 2011, a second core leg 2012, a primary coil 2013, a secondary coil 2015, and a stabilizing coil 2017 that are disposed on the first core leg 2011, and a primary coil 2014, a secondary coil 2016, and a stabilizing coil 2018 that are disposed on the second core leg 2012 of a rectangular frame core.
Head end A of primary coil 2013 of first two-column single-phase dry-type transformer 201011And the head end A of the primary coil 2014 of the first double-column single-phase dry-type transformer 201012Connected as a primary terminal a; end X of primary coil 2013 of first two-limb single-phase dry-type transformer 201011The end X of the primary coil 2014 of the first dual-column single-phase dry-type transformer 201012Connected as a primary terminal end X. Wherein, the head end A of the primary coil 2013 of the first dual-column single-phase dry-type transformer 201011And a head end A of the primary coil 2014 of the first dual-limb single-phase dry-type transformer 201012Is the same name end. Of a first two-limb single-phase dry-type transformer 2010End X of primary coil 201311The tail end X of the primary coil 2014 of the first double-column single-phase dry-type transformer 201012Are non-homonymous terminals.
Head end a of secondary coil 2015 of first two-limb single-phase dry-type transformer 201021And head end a of secondary coil 201622Connecting to form a secondary terminal a; terminal x of secondary coil 2015 of first two-limb single-phase dry-type transformer 201021End x of secondary coil 2016 of first two-limb single-phase dry-type transformer 201022The connection forms a secondary terminal end x. Wherein: head end a of secondary coil 2015 of first two-limb single-phase dry-type transformer 201021And head end a of secondary coil 201622Is the same name end. Terminal x of secondary coil 2015 of first two-limb single-phase dry-type transformer 201021End x of secondary coil 2016 of first two-limb single-phase dry-type transformer 201022Are non-homonymous terminals.
Head end a of stabilizing coil 2017 of first two-limb single-phase dry-type transformer 201031The first end a of the stabilizing coil 2018 of the first two-limb single-phase dry-type transformer 201032Connected to form a stable coil head end terminal a3(ii) a Terminal x of stabilizing coil 2017 of first two-limb single-phase dry-type transformer 201031Terminal x of stabilizing coil 2018 of first two-limb single-phase dry-type transformer 201032Connection to form a stable coil end terminal x3. Wherein, the head end a of the stabilizing coil 2017 of the first two-column single-phase dry-type transformer 201031The first end a of the stabilizing coil 2018 of the first two-limb single-phase dry-type transformer 201032Is the same name end. Terminal x of stabilizing coil 2017 of first two-limb single-phase dry-type transformer 201031Terminal x of stabilizing coil 2018 of first two-limb single-phase dry-type transformer 201032Are non-homonymous terminals.
The second twin-column single-phase dry-type transformer 2020 includes: a first leg core 2021, a second leg core 2022, a primary coil 2023 and a secondary coil 2025 and a stabilizing coil 2027 which are provided on the first leg core 2021, and a primary coil 2024 and a secondary coil 2026 and a stabilizing coil 2028 which are provided on the second leg core 2022 of a rectangular frame core.
Head end B of primary coil 2023 of second double-column single-phase dry-type transformer 202011And the head end B of the primary coil 2024 of the second double-column single-phase dry-type transformer 202012Connected as a primary terminal B; end Y of primary coil 2023 of second double-column single-phase dry-type transformer 202011And the tail end Y of the primary coil 2024 of the second double-column single-phase dry-type transformer 202012Connected as a primary terminal end Y. Wherein, the head end B of the primary coil 2023 of the second double-column single-phase dry-type transformer 202011And the head end B of the primary coil 2024 of the second double-column single-phase dry-type transformer 202012Is the same name end. End Y of primary coil 2023 of second double-column single-phase dry-type transformer 202011And the tail end Y of a primary coil 2024 of a second double-column single-phase dry-type transformer 202012Are non-homonymous terminals.
Head end b of secondary coil 2025 of second double-column single-phase dry-type transformer 202021And the head end b of the secondary coil 202622Connecting to form a secondary terminal b; end y of secondary coil 202521And the end y of the secondary coil 202622The connection forms a secondary terminal end y. Wherein, the head end b of the secondary coil 2025 of the second double-column single-phase dry-type transformer 202021And the head end b of the secondary coil 202622Is the same name end. End y of secondary coil 202521And the end y of the secondary coil 202622Are non-homonymous terminals.
Head end b of stabilizing coil 2027 of second double-column single-phase dry-type transformer 202031And the head end b of the stabilizing coil 202832Connected to form a stable coil head end terminal b3(ii) a End y of stabilizing coil 202731And the end y of the stabilizing coil 202832Connected to form a stable coil end terminal y3. Wherein the head end b of the stabilizing coil 2027 of the second double-column single-phase dry-type transformer 202031And the head end b of the stabilizing coil 202832Is a homonymous terminal. End y of stabilizing coil 202731And the end y of the stabilizing coil 202832Are non-homonymous terminals.
The third dual-column single-phase dry transformer 2030 includes: a first core leg 2031, a second core leg 2032, a primary coil 2033, a secondary coil 2035, and a stabilizing coil 2037 provided on the first core leg 2031, and a primary coil 2034, a secondary coil 2036, and a stabilizing coil 2038 provided on the second core leg 2032 of one rectangular frame core.
Head end C of primary coil 2033 of third double-column single-phase dry-type transformer 203011And the head end C of the primary coil 2034 of the third double-column single-phase dry-type transformer 203012Connected as a primary terminal C; terminal Z of primary coil 2033 of third dual-limb single-phase dry-type transformer 203011Terminal Z of primary coil 2034 of third double-column single-phase dry-type transformer 203012Connected as a primary terminal end Z. Wherein, the first end C of the primary coil 2033 of the third double-column single-phase dry-type transformer 203011And the head end C of the primary coil 2034 of the third double-column single-phase dry-type transformer 203012Is the same name end. Terminal Z of primary coil 2033 of third dual-limb single-phase dry-type transformer 203011Terminal Z of primary coil 2034 of third double-column single-phase dry-type transformer 203012Are non-homonymous terminals.
Head end c of secondary coil 2035 of third double-column single-phase dry-type transformer 203021And the head end c of the secondary coil 203622Connecting to form a secondary terminal c; end z of secondary coil 203521And the end z of the secondary coil 203622The connection forms a secondary terminal end z. Wherein, the head end c of the secondary coil 2035 of the third double-column single-phase dry-type transformer 203021And the head end c of the secondary coil 203622Is the same name end. End z of secondary coil 203521And the end z of the secondary coil 203622Are non-homonymous terminals.
Head end c of stabilizing coil 2037 of third double-column single-phase dry-type transformer 203031And the head end c of the stabilizing coil 203832Connected to form a stable coil head end terminal c3(ii) a End z of stabilizing coil 203731And the end z of the stabilizing coil 203832Connecting to form a stable coil end terminal z3. Among them, the head end of the stabilizing coil 2037 of the third double-column single-phase dry-type transformer 2030c31And the head end c of the stabilizing coil 203832Is the same name end. End z of stabilizing coil 203731And the end z of the stabilizing coil 203832Are non-homonymous terminals.
In some embodiments, with reference to fig. 2 and 3, a primary terminal end X of the primary coil of the first two-limb single-phase dry-type transformer 2010, a primary terminal end Y of the primary coil of the second two-limb single-phase dry-type transformer 2020, and a primary terminal end Z of the primary coil of the third two-limb single-phase dry-type transformer 2030 are connected to form a star Y.
It should be noted that the primary terminal a, the primary terminal B, and the primary terminal C are used for connection to a power grid.
In some embodiments, also in conjunction with fig. 2 and 3, the non-homonymous terminals x, y, and z of the secondary coils of three dual-limb single-phase dry-type transformers are connected together to form a wyn connection. The head terminal is abc and the neutral terminal is n, and is connected to an electric device.
It should be noted that the electrical device may be a current transformer.
In some embodiments, also referring to fig. 2 and 3, the end-to-end connections of the stabilizing coils of the three twin-limb single-phase dry-type transformers form a triangle d, that is:
stabilizing coil end terminal x of first two-limb single-phase dry-type transformer 20103A stable coil head end terminal b connected with the second double-column single-phase dry type transformer 20203(ii) a Stabilizing coil end terminal y of second double-column single-phase dry type transformer 20203A stable coil head end terminal c connected to the third double-column single-phase dry type transformer 20303(ii) a Stabilizing coil end terminal z of third double-limb single-phase dry type transformer 20303Connecting the first two-limb single-phase dry-type transformer 2010 to the first stabilizing coil head end terminal a3。
And after the stable coils of the three double-column single-phase dry-type transformers are connected end to end, terminals do not need to be led out.
Fig. 4 shows a potential phasor diagram of a Yyn0+ d three-phase dry-type transformer bank disclosed by the embodiment of the utility model. Wherein the voltage of the primary coil is in phase with the voltage of the secondary coil and differs from the voltage of the stabilizing coil by 30 degrees.
In the three-phase dry-type transformer bank provided by this embodiment, as shown in fig. 5, when the zero-sequence current i0When the current flows through the secondary coils of the three-phase dry-type transformer, the secondary coils 2015 and 2016, the secondary coils 2025 and 2026 and the secondary coils 2035 and 2036 generate a zero-sequence leakage magnetic flux phi0. Since the stabilizing coils 2017 and 2018, the stabilizing coils 2027 and 2028, and the stabilizing coils 2037 and 2038 are closely coupled to the corresponding secondary coils, respectively, and the stabilizing coils 2017 and 2018, the stabilizing coils 2027 and 2028, and the stabilizing coils 2037 and 2038 are connected in a delta, a zero-sequence magnetic flux- Φ -is generated in the cores of the stabilizing coils 2017 and 2018, the stabilizing coils 2027 and 2028, and the stabilizing coils 2037 and 20380. Leakage flux phi due to zero sequence0With zero sequence flux-phi0The zero-sequence magnetic flux is equal in magnitude but opposite in direction, zero-sequence magnetic flux is not generated in the iron core main magnetic circuit, zero-sequence potential is not induced in the primary coil, and adverse effects of zero-sequence current on a power grid can be effectively inhibited.
It should be noted that the present invention is not limited to the exemplary Yyn0+ d three-phase dry transformer bank, and all three-phase dry transformer banks (e.g., Yyn2+ d, Yyn4+ d, Yyn6+ d, Yyn8+ d, and Yyn10+ d) meeting the requirements of the present invention except the exemplary three-phase dry transformer bank fall within the protection scope of the present invention.
The three-phase dry type transformer bank structure proposed in the foregoing description is not limited to the three-phase dry type transformer bank. In some embodiments, the above structure can be applied to three-phase oil-immersed transformers and three-phase gas-insulated transformers.
It should be further noted that, the three-phase dry-type transformer bank described above should further include: the components of the housing, cooling system and protection device, etc., are not described here.
In some embodiments, the primary coil (2013,2023,2033) on the first leg core is connected in series with the primary coil (2014,2024,2034) on the second leg core and then connected to Y.
Optionally, the secondary coil (2015,2025,2035) on the first leg core is connected in series with the secondary coil (2016,2026,2036) on the second leg core and then connected as yn.
Optionally, the stabilization coil (2017,2027,2037) on the first leg core is connected in series with the stabilization coil (2018,2028,2038) on the second leg core and then connected to d.
It should be noted that, in the above description, symbols of Yyn0+ d, Yyn2+ d, Yyn4+ d, Yyn6+ d, Yyn8+ d, and Yyn10+ d are connection group symbols.
The connection group reference number is a symbol representing the connection method of the transformer coil and the relation between the primary side and the secondary side corresponding to the line potential phase. The connecting group mark number is composed of letters and numbers, the former letters sequentially represent the connecting method of the high-voltage secondary coil and the secondary coil from left to right, and the connecting method of the stabilizing coil, wherein capital letters are the connecting mode of the primary coil, small letters are the connecting mode of the secondary coil, and the rear part of the upper letter is the connecting mode of the stabilizing coil. D and D represent triangle connection, Y and Y represent star connection, and in the star connection, two connection modes of a neutral point and a neutral point are adopted, the neutral point is not added with any sign, the neutral point is added with a letter N after the letter Y, or the letter Y is added with a letter N, the latter number can be an integer between 0 and 11 and represents the magnitude of phase shift of the secondary coil wire potential to the primary coil wire potential, and the number multiplied by 30 degrees is the angle number of the phase shift of the low-voltage side wire potential lagging the high-voltage side wire potential.
It should also be noted that 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 the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (9)
1. A three-phase dry type transformer bank, comprising: three double-column single-phase dry-type transformers; wherein:
each of the two-pole single-phase dry-type transformers includes: the coil comprises a first iron core column, a second iron core column, a primary coil, a secondary coil and a stabilizing coil which are arranged on the first iron core column, and a primary coil, a secondary coil and a stabilizing coil which are arranged on the second iron core column;
primary coils of the three double-column single-phase dry-type transformers are connected by adopting a star connection method; the secondary coils of the three double-column single-phase dry-type transformers are connected by adopting a star yn connection method; and the three stabilizing coils of the double-column single-phase dry-type transformer are coupled with the secondary coils of the three double-column single-phase dry-type transformers, and are connected by adopting a delta connection method.
2. A three-phase dry type transformer bank as claimed in claim 1, wherein the three stabilizing coils of the two-limb single-phase dry type transformer are coupled with the secondary coils of the three two-limb single-phase dry type transformer, comprising:
for each double-column single-phase dry-type transformer, a secondary coil on the first iron core column and a stable coil on the first iron core column are in a close magnetic coupling relationship; and the secondary coil on the second iron core column and the stabilizing coil on the second iron core column are in close magnetic coupling relationship.
3. A three-phase dry-type transformer bank as claimed in claim 1 or 2, wherein, for each of the two-limb single-phase dry-type transformers, a homonymous end of the primary coil of the first limb and a homonymous end of the primary coil of the second limb are connected to form a primary terminal; the non-homonymous end of the primary coil of the first iron leg and the non-homonymous end of the primary coil of the second iron leg are connected to form a primary terminal tail end;
and the primary terminals of the three double-column single-phase dry-type transformers are used for connecting a power grid, and the tail ends of the primary terminals of the three double-column single-phase dry-type transformers are connected by adopting a star connection method.
4. A three-phase dry-type transformer bank as claimed in claim 1 or 2, wherein, for each of the double-limb single-phase dry-type transformers, a homonymous end of the secondary coil of the first limb and a homonymous end of the secondary coil of the second limb are connected to form a secondary terminal; the non-homonymous end of the secondary coil of the first iron leg and the non-homonymous end of the secondary coil of the second iron leg are connected to form a secondary terminal tail end;
the tail ends of secondary terminals of the three double-column single-phase dry-type transformers are connected by adopting a star yn connection method, and the secondary terminals of the three double-column single-phase dry-type transformers are connected with electrical equipment.
5. A three-phase dry-type transformer bank as claimed in claim 1 or 2, wherein, for each of said two-limb single-phase dry-type transformers, a homonymous end of the stabilizing coil of the first limb and a homonymous end of the stabilizing coil of the second limb are connected to form a stabilizing coil head end terminal; the non-homonymous end of the stabilizing coil of the first iron leg and the non-homonymous end of the stabilizing coil of the second iron leg are connected to form a stabilizing coil terminal;
and the head end terminal of the stabilizing coil and the tail end terminal of the stabilizing coil of the double-column single-phase dry-type transformer are connected by adopting a delta connection method.
6. A three-phase dry-type transformer bank as claimed in claim 5, wherein the terminal of the stabilizing coil of the first twin-limb single-phase dry-type transformer is connected to the terminal of the stabilizing coil of the second twin-limb single-phase dry-type transformer; the tail end terminal of the stabilizing coil of the second double-column single-phase dry-type transformer is connected with the head end terminal of the stabilizing coil of the third double-column single-phase dry-type transformer; and the tail end terminal of the stabilizing coil of the third double-column single-phase dry-type transformer is connected with the head end terminal of the stabilizing coil of the first double-column single-phase dry-type transformer.
7. The three-phase dry transformer bank as recited in claim 1, wherein the first and second leg cores are rectangular frame leg cores.
8. The three-phase dry transformer bank of claim 1, wherein the dual-limb single-phase dry transformer further comprises: a housing, a cooling system, and a protective device.
9. A three-phase dry-type transformer bank as claimed in claim 1, wherein the secondary windings of the three double-limb single-phase dry-type transformers are connected by wyn connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220200421.9U CN216773015U (en) | 2022-01-25 | 2022-01-25 | Three-phase dry type transformer bank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220200421.9U CN216773015U (en) | 2022-01-25 | 2022-01-25 | Three-phase dry type transformer bank |
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| CN216773015U true CN216773015U (en) | 2022-06-17 |
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