CN114156070A - Oil-immersed transformer - Google Patents

Oil-immersed transformer Download PDF

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Publication number
CN114156070A
CN114156070A CN202111638802.1A CN202111638802A CN114156070A CN 114156070 A CN114156070 A CN 114156070A CN 202111638802 A CN202111638802 A CN 202111638802A CN 114156070 A CN114156070 A CN 114156070A
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CN
China
Prior art keywords
oil
coil
coils
transformer
voltage
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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
Application number
CN202111638802.1A
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Chinese (zh)
Inventor
穆淑萍
赵芊
孙允强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jinan Qinghe Electric Co ltd
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Jinan Qinghe Electric Co ltd
Priority date (The priority date 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 date listed.)
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Publication date
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Priority to CN202111638802.1A priority Critical patent/CN114156070A/en
Publication of CN114156070A publication Critical patent/CN114156070A/en
Pending legal-status Critical Current

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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
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • 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
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
    • 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
    • H01F27/2823—Wires
    • H01F27/2828—Construction of conductive connections, of leads
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformer Cooling (AREA)

Abstract

The application discloses oil-immersed transformer for solve current on-load tap changing transformer can not satisfy the problem of transformer voltage regulation demand under the heavy current. The oil-immersed transformer comprises a plurality of iron cores immersed in an oil tank, a primary coil, a secondary coil, a voltage regulating coil and a three-phase switch; the iron cores are sequentially arranged in the oil tank, and corresponding primary coils and secondary coils are respectively wound on the iron cores; one part of the lead wires of the primary coils form voltage regulating coils, one end of each of the voltage regulating coils is connected with the primary coil, and the other end of each of the voltage regulating coils is connected with a corresponding switch in the three-phase switch; a plurality of switches and a plurality of iron cores in the three-phase switch are arranged in a crossed mode, and the switches are used for adjusting the voltage of the primary coils in a linkage mode.

Description

Oil-immersed transformer
Technical Field
The application relates to the technical field of transformers, in particular to an oil-immersed transformer.
Background
A transformer is a device that changes the voltage of alternating current using the principle of electromagnetic induction. In the use process of the transformer, the voltage regulator needs to be regulated according to the use requirement.
Currently, there are two types of regulating transformers. One is no-excitation voltage regulation, manual voltage regulation is needed after the transformer power supply is disconnected, the other is on-load voltage regulation, and under the condition that the power supply is not disconnected, the voltage is automatically regulated through an on-load voltage regulation switch according to the change of the power grid voltage, so that the output voltage is kept stable.
However, the on-load tap changer cannot regulate the voltage of a plurality of coils together after the on-load tap changer reaches a certain current (such as 800A), and cannot meet the voltage regulation requirement of the transformer.
Disclosure of Invention
The embodiment of the application provides an oil-immersed transformer for solve the problem that the current on-load tap changing transformer can not satisfy the transformer voltage regulation demand under the heavy current.
The oil-immersed transformer comprises a plurality of iron cores immersed in an oil tank, a primary coil, a secondary coil, a voltage regulating coil and a three-phase switch;
the iron cores are sequentially arranged in the oil tank, and the corresponding primary coil and the corresponding secondary coil are respectively wound on the iron cores;
one part of the lead wires of the primary coils form the voltage regulating coils, one end of each of the voltage regulating coils is connected with the primary coil, and the other end of each of the voltage regulating coils is connected with a corresponding switch in the three-phase switch;
and a plurality of switches in the three-phase switch and the plurality of iron cores are arranged in a crossed manner, and the switches are used for adjusting the voltage of the primary coils in a linkage manner.
In one example, the three-phase switch includes three identical single-phase on-load tap changers capable of carrying no less than 800A of current.
In one example, further comprising a fixture; the fixing piece is used for fixing the lead and the corresponding switch.
In one example, the fixture is wood.
In one example, a number of heat sinks are also included; the radiators are respectively arranged on the outer sides of the oil tanks.
In one example, the core is circular in cross-section and has a diameter of no less than 510 mm.
In one example, the lead wire is a copper core cable, and the cross section of the cable is not less than 450 mm.
In one example, the plurality of switches are irregularly arranged.
In one example, the primary coil is a continuous coil.
In one example, the secondary coil includes a plurality of windings wound on the frame pole of the core, and the plurality of windings are connected in sequence.
The embodiment of the application provides an oil-immersed transformer to on-load voltage regulation's mode can realize not closing the online voltage regulation of power. The three switches in the three-phase switch are respectively connected with the coils of the three iron cores, and the voltage of the three coils can be adjusted in a linkage mode by connecting one coil with one switch, so that the voltage of a plurality of coils can be adjusted under a large current, the voltage of the large current can be adjusted, the voltage regulation requirement of the transformer under the large current is met, and the current coils can be safely operated on the basis of meeting various product test standards. And, through the improvement to coil lead structure, separate out the voltage regulation section in the coil lead wire alone promptly and become a set of solitary voltage regulation coil, make the connection between lead wire and the switch more convenient, convenient. In addition, the iron core of the transformer vibrates and generates heat due to the magnetostrictive effect during working, main components of the whole transformer are completely immersed in the oil tank and cooled in an oil immersion mode, and stable working of the transformer is facilitated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of an oil-immersed transformer provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, 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 application.
The transformer mainly comprises a primary coil, a secondary coil and an iron core, and the working principle of changing alternating voltage is as follows: the iron core is wound with a plurality of groups of coils, the electromagnetic coil connected with the transformer and one side of the switching power supply is a primary coil, and the electromagnetic coil connected with the transformer and the electric equipment is a secondary coil. After the primary coil of the transformer is connected to an alternating current power supply, a transformed magnetic induction line is generated in the iron core. Because the secondary coil and the primary coil are wound on the same iron core, the magnetic induction wire generated in the iron core penetrates through the winding of the secondary coil wound on the iron core, the secondary coil is cut, and induced current is necessarily generated on the secondary coil, so that working voltage appears at two ends of the electromagnetic coil. Because the magnetic induction lines are changed alternately, the working voltage of the secondary coil is also changed alternately, and the frequency is completely consistent with the frequency of the switching power supply.
The application provides a pair of oil-immersed transformer lets in alternating voltage in primary coil, produces electromagnetic induction through the iron core, and certain voltage is induced out to rethread secondary coil. Under the condition that voltage regulation is required to be carried out in the primary coil according to the power grid requirement, the high-capacity nonstandard transformer can automatically regulate the power grid voltage under the condition of no power failure. In addition, the transformer is provided with a voltage regulating section which is separately separated from a lead of the primary coil and is connected with the switch, and large current is transmitted through the voltage regulating section and the large-section lead, so that the voltage can be timely and effectively regulated according to the requirements of a power grid, and the manufacturing cost can be saved. In addition, the large-section lead is firmly connected by the fixing piece, so that the wiring problem caused by vibration is avoided during operation, and the radiator is arranged, so that heat generated by the whole device can be timely dissipated, and the balance between heating and heat dissipation is kept. The details will be described below.
Fig. 1 is a schematic structural diagram of an oil-immersed transformer provided in an embodiment of the present application. As shown in fig. 1, the oil-filled transformer specifically includes a plurality of iron cores 1 immersed in an oil tank, a coil 2, and a three-phase switch 3. The coil 2 includes a primary coil, a secondary coil, and a voltage regulating coil, which are not specifically labeled in fig. 1.
Specifically, the oil-filled transformer includes three cores 1 corresponding to three switches of the three-phase switch 3. The iron cores 1 are sequentially arranged in the oil tank, and corresponding primary coils and secondary coils are respectively wound on the iron cores. One part of the lead of the primary coil is a voltage regulating section, and the voltage regulating section is independently used as a voltage regulating coil in the scheme. One end of the voltage regulating coil is connected with the primary coil, and the other end of the voltage regulating coil is connected with a corresponding switch in the three-phase switch 3. The primary coil of each iron core 1 is connected with one of the three-phase switches 3 through a voltage regulating coil, specifically, the tapping of the coil is connected with the contact of the switch. A plurality of switches and a plurality of iron cores in the three-phase switch 3 are arranged in a crossed mode, and the switches are used for adjusting the voltage of the primary coil in a linkage mode.
In the embodiment of the application, online voltage regulation without power supply shutdown can be realized in an on-load voltage regulation mode. The three switches in the three-phase switch are respectively connected with the coils of the three iron cores, and the voltage of the three coils can be adjusted in a linkage mode by connecting one coil with one switch, so that the voltage of a plurality of coils can be adjusted under a large current, the requirement of voltage adjustment of the transformer under the large current can be met, and the current coils can be operated safely on the basis of meeting various product test standards. And, through the improvement to coil lead structure, separate out the voltage regulation section in the coil lead wire alone promptly and become a set of solitary voltage regulation coil, make the connection between lead wire and the switch more convenient, convenient. In addition, the iron core of the transformer vibrates and generates heat due to the magnetostrictive effect during working, main components of the whole transformer are completely immersed in the oil tank and cooled in an oil immersion mode, and stable working of the transformer is facilitated.
In one embodiment, the three-phase switch comprises three identical single-phase on-load tap changers, the single-phase on-load tap changers adopt high-current switches, the current which can be carried by the single-phase on-load tap changers is not less than 800A, and the specification of the single-phase on-load tap changers can specifically adopt ZMI-800-72.5/B-10071W combined switches (MA7D controllers). Through the voltage regulating switch who chooses for use the heavy current, make the transformer can realize the voltage regulation under the heavy current, satisfy the voltage regulation demand of heavy current, and safer.
In one embodiment, as shown in fig. 1, the oil-filled transformer further comprises a fixing member 4. The fixing part 4 is used for fixing the lead and the corresponding switch, so that the wiring stability of the lead and the switch is improved, and the situation that the lead and the switch are separated due to the vibration of the iron core in the working process of the transformer, and the normal work of the transformer is influenced is prevented.
In one embodiment, the fixing member 4 may be a wooden material.
In one embodiment, as shown in fig. 1, the oil filled transformer further comprises several heat sinks 5. The radiators 5 are respectively arranged on the outer sides of the oil tanks and used for radiating heat for the transformer. For example, the heat sink may be a fan or the like.
In one embodiment, the iron cores 1 may be fixed to the lower portion of the fuel tank in a straight arrangement (i.e., the iron cores are located on the same line). The iron core 1 may be a cylinder having a circular cross section and a diameter of not less than 510 mm. The diameter of the cross section of the iron core is enlarged as much as possible, so that the cost is saved, and the short-circuit resistance of the coil is enhanced.
In one embodiment, the section of the connecting lead must be capable of carrying large currents, so that the lead can adopt a copper core cable, and the cross section of the cable is not less than 450 mm. Through the copper core cable of large cross-section, can bear great electric current to satisfy the heavy current voltage regulation demand of transformer.
In one embodiment, the switches and the iron core are arranged in a crossed mode and are fixed on the oil tank, and the switches are arranged irregularly. For example, the switches are not in the same straight line, and the distance between every two adjacent switches is not equal.
In one embodiment, the primary coil is a continuous coil.
In one embodiment, the secondary coil comprises a plurality of windings wound on the legs of the core 1, the plurality of windings being connected in series. For example, the secondary coil includes winding A, B, C, and winding A, B, C is connected to form the secondary coil.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
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 like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. 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 (10)

1. An oil-immersed transformer is characterized by comprising a plurality of iron cores immersed in an oil tank, a primary coil, a secondary coil, a voltage regulating coil and a three-phase switch;
the iron cores are sequentially arranged in the oil tank, and the corresponding primary coil and the corresponding secondary coil are respectively wound on the iron cores;
one part of the lead wires of the primary coils form the voltage regulating coils, one end of each of the voltage regulating coils is connected with the primary coil, and the other end of each of the voltage regulating coils is connected with a corresponding switch in the three-phase switch;
and a plurality of switches in the three-phase switch and the plurality of iron cores are arranged in a crossed manner, and the switches are used for adjusting the voltage of the primary coils in a linkage manner.
2. The oil filled transformer of claim 1, wherein the three-phase switch comprises three identical single-phase on-load tap changers capable of carrying a current of no less than 800A.
3. The oil filled transformer of claim 1, further comprising a fixture;
the fixing piece is used for fixing the lead and the corresponding switch.
4. Oil filled transformer according to claim 3, characterized in that the fixation member is wooden.
5. The oil filled transformer of claim 1, further comprising a plurality of heat sinks;
the radiators are respectively arranged on the outer sides of the oil tanks.
6. Oil filled transformer according to claim 1, characterized in that the core is circular in cross-section and has a diameter of not less than 510 mm.
7. The oil-filled transformer of claim 1, wherein the leads are copper-core cables, and the cross section of the cables is not less than 450 mm.
8. The oil filled transformer of claim 1, wherein the plurality of switches are irregularly arranged.
9. Oil filled transformer according to claim 1, characterized in that the primary coil is a continuous coil.
10. The oil-filled transformer of claim 1, wherein the secondary coil comprises a plurality of windings wound around the frame legs of the core, and the plurality of windings are connected in sequence.
CN202111638802.1A 2021-12-30 2021-12-30 Oil-immersed transformer Pending CN114156070A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111638802.1A CN114156070A (en) 2021-12-30 2021-12-30 Oil-immersed transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111638802.1A CN114156070A (en) 2021-12-30 2021-12-30 Oil-immersed transformer

Publications (1)

Publication Number Publication Date
CN114156070A true CN114156070A (en) 2022-03-08

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CN (1) CN114156070A (en)

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102360849A (en) * 2011-07-12 2012-02-22 三变科技股份有限公司 Double-high and low voltage on-load regulating transformer
CN103050260A (en) * 2012-12-24 2013-04-17 保定天威保变电气股份有限公司 330kV-level three-phase three-winding high-impedance power auto-transformer with function of on-load voltage regulation
CN103606445A (en) * 2013-12-04 2014-02-26 正泰电气股份有限公司 Method for effectively reducing current passing through on-load tap-changer of transformers
CN204441068U (en) * 2015-03-06 2015-07-01 江苏伯乐达变压器有限公司 A kind of ocean platform multi-stage pressure regulating oil immersed type step-up transformer
CN204497035U (en) * 2015-03-30 2015-07-22 北京电研华源电力技术有限公司 Oil-filled transformer
CN204651139U (en) * 2015-06-16 2015-09-16 山东玲珑机电有限公司 A kind of three-phase power transformer
CN204760203U (en) * 2015-06-26 2015-11-11 天津市特变电工变压器有限公司 Dry -type on -load voltage -regulating transformer with wiring copper bar
CN205211575U (en) * 2015-10-29 2016-05-04 长春三鼎变压器有限公司 Phase separating pressure regulating formula electric furnace transformer
CN206363858U (en) * 2017-01-06 2017-07-28 陕西汉中变压器有限责任公司 Three-phase three winding is air-cooled load auto-transformer
CN206564172U (en) * 2017-03-06 2017-10-17 广西柳州特变科技有限责任公司 Multipurpose three-phase transformer
CN107424806A (en) * 2017-08-30 2017-12-01 正泰电气股份有限公司 The device and method of high-current low-voltage side twin voltage switching can be realized
CN206907632U (en) * 2017-05-08 2018-01-19 特变电工智能电气有限责任公司 A kind of oil immersed type on-load voltage regulation three dimensional wound core transformer
CN108922759A (en) * 2018-06-25 2018-11-30 河南森源电气股份有限公司 A kind of high pressure automatic reactive compensation amorphous alloy distribution transformer
CN109637792A (en) * 2018-12-24 2019-04-16 特变电工湖南电气有限公司 Testing transformer
CN208922887U (en) * 2018-12-04 2019-05-31 常州西电变压器有限责任公司 A kind of multi-stage pressure regulating oil-immersed transformer

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102360849A (en) * 2011-07-12 2012-02-22 三变科技股份有限公司 Double-high and low voltage on-load regulating transformer
CN103050260A (en) * 2012-12-24 2013-04-17 保定天威保变电气股份有限公司 330kV-level three-phase three-winding high-impedance power auto-transformer with function of on-load voltage regulation
CN103606445A (en) * 2013-12-04 2014-02-26 正泰电气股份有限公司 Method for effectively reducing current passing through on-load tap-changer of transformers
CN204441068U (en) * 2015-03-06 2015-07-01 江苏伯乐达变压器有限公司 A kind of ocean platform multi-stage pressure regulating oil immersed type step-up transformer
CN204497035U (en) * 2015-03-30 2015-07-22 北京电研华源电力技术有限公司 Oil-filled transformer
CN204651139U (en) * 2015-06-16 2015-09-16 山东玲珑机电有限公司 A kind of three-phase power transformer
CN204760203U (en) * 2015-06-26 2015-11-11 天津市特变电工变压器有限公司 Dry -type on -load voltage -regulating transformer with wiring copper bar
CN205211575U (en) * 2015-10-29 2016-05-04 长春三鼎变压器有限公司 Phase separating pressure regulating formula electric furnace transformer
CN206363858U (en) * 2017-01-06 2017-07-28 陕西汉中变压器有限责任公司 Three-phase three winding is air-cooled load auto-transformer
CN206564172U (en) * 2017-03-06 2017-10-17 广西柳州特变科技有限责任公司 Multipurpose three-phase transformer
CN206907632U (en) * 2017-05-08 2018-01-19 特变电工智能电气有限责任公司 A kind of oil immersed type on-load voltage regulation three dimensional wound core transformer
CN107424806A (en) * 2017-08-30 2017-12-01 正泰电气股份有限公司 The device and method of high-current low-voltage side twin voltage switching can be realized
CN108922759A (en) * 2018-06-25 2018-11-30 河南森源电气股份有限公司 A kind of high pressure automatic reactive compensation amorphous alloy distribution transformer
CN208922887U (en) * 2018-12-04 2019-05-31 常州西电变压器有限责任公司 A kind of multi-stage pressure regulating oil-immersed transformer
CN109637792A (en) * 2018-12-24 2019-04-16 特变电工湖南电气有限公司 Testing transformer

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