CN112071576A - Voltage transformer for station - Google Patents

Voltage transformer for station Download PDF

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Publication number
CN112071576A
CN112071576A CN202011029667.6A CN202011029667A CN112071576A CN 112071576 A CN112071576 A CN 112071576A CN 202011029667 A CN202011029667 A CN 202011029667A CN 112071576 A CN112071576 A CN 112071576A
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CN
China
Prior art keywords
oil tank
module
iron core
bottom end
winding
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
Application number
CN202011029667.6A
Other languages
Chinese (zh)
Inventor
徐明利
唐陈
薛福明
周新宇
顾皓
黄创
邢镇云
候家威
郑旭
夏亚东
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.)
JIANGSU SIEYUAN HERTZ INSTRUMENT TRANSFORMER CO Ltd
Original Assignee
JIANGSU SIEYUAN HERTZ INSTRUMENT TRANSFORMER 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.)
Filing date
Publication date
Application filed by JIANGSU SIEYUAN HERTZ INSTRUMENT TRANSFORMER CO Ltd filed Critical JIANGSU SIEYUAN HERTZ INSTRUMENT TRANSFORMER CO Ltd
Priority to CN202011029667.6A priority Critical patent/CN112071576A/en
Publication of CN112071576A publication Critical patent/CN112071576A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • 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
    • H01F27/2876—Cooling
    • 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
    • H01F27/288—Shielding
    • H01F27/2885—Shielding with shields or electrodes
    • 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
    • H01F27/303—Clamping coils, windings or parts thereof together
    • 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
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • 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
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/24—Voltage transformers
    • H01F38/26—Constructions

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)

Abstract

The invention relates to a voltage transformer for a station, which is characterized in that: the expansion device comprises an expander module, an insulation submodule, an oil tank module and an iron core module; the expander module, the insulation module and the oil tank module are connected from top to bottom; the iron core module is arranged in the oil tank module; epoxy strips are arranged in the primary winding and the secondary winding to support and form a flow channel, and the flowing heat dissipation in the oil tank module can increase the contact area with the windings, quickly take away the heat in the windings and improve the heat dissipation performance; the outer layers of the primary winding and the secondary winding are provided with the cable paper for shielding, so that the electric field of a product can be effectively improved, and the partial discharge level of the product is reduced; the adhesive tape is adopted between the primary winding and the secondary winding, curing treatment is carried out before integral assembly, so that the primary winding and the secondary winding are of an integral structure, the integral strength of the winding is improved, the secondary winding is fixed on the framework, the framework is fixed on the iron core clamping piece through the fixing flange, and the integral fixation of the winding is reliable.

Description

Voltage transformer for station
Technical Field
The invention relates to the technical field of voltage transformers, in particular to a voltage transformer for a station.
Background
The voltage transformer for the oil immersed station mainly serves as power supply equipment of a secondary load of a transformer substation, and is a low-cost power supply solution and a temporary power supply emergency plan in remote areas. The main application scenarios are as follows: (1) a transformer substation auxiliary service power supply; (2) a power supply for a telecommunications and surveillance system; (3) rural electrification of remote populations; (4) a temporary emergency power supply.
Compared with a conventional electromagnetic voltage transformer (the secondary output capacity is generally 300 VA), the secondary output capacity of the voltage transformer for the oil-immersed station is large (100 kVA or more). When the device runs, the primary and secondary coils have large through flow and are easy to generate heat, so that the temperature rise is too high, and the problem of temperature rise and heat dissipation of a product needs to be solved. The product voltage level is high, and the insulation level is high, and the problem of product insulation partial amplification needs to be solved. The coil is large in size and heavy in weight, and reliable fixation needs to be considered.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a voltage transformer for a station, which can solve the problems that the common voltage transformer for the station has serious heating problem once round, the coil field intensity is large to influence the local discharge, the coil size is large, and the weight is heavy and reliable to fix.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a voltage transformer is used at station which innovation point lies in: the expansion device comprises an expander module, an insulation submodule, an oil tank module and an iron core module; the expander module, the insulation module and the oil tank module are connected from top to bottom; the iron core module is arranged in the oil tank module;
the expander module comprises an expander, an expander cover and an upper cover plate; the bottom end of the expander is connected to the upper surface of the upper cover plate, the expander is covered by the expander cover, and the bottom end of the expander cover is connected to the upper surface of the upper cover plate; a through hole is formed in the center of the upper cover plate, and a primary terminal horizontally extends outwards from the edge of the bottom end of the upper cover plate;
the insulating submodule comprises an outer porcelain sleeve, a lead tube, a capacitive screen and an insulating support piece; the outer porcelain bushing is of a cylindrical structure, and umbrella skirts are arranged on the outer contour of the outer porcelain bushing and close to the upper end and the lower end; the top end of the outer porcelain sleeve is connected to the bottom end face of the upper cover plate through a high-pressure flange, and the bottom end of the outer porcelain sleeve is connected to the oil tank module through a high-pressure flange; the lead pipe is arranged along the axial direction of the outer porcelain sleeve, the top end of the lead pipe penetrates through a through hole in the middle of the upper cover plate and extends into the expander, and the lead pipe penetrates through the outer porcelain sleeve and extends into the oil tank module; the capacitive screen is nested outside the lead tube and is positioned between the inner wall of the outer porcelain sleeve and the outer wall of the lead tube; the bottom end of the capacitive screen is arranged in the oil tank module along the edge, and the bottom end of the capacitive screen is supported by the insulating support piece;
the insulating support piece is arranged in the oil tank module, the top end of the insulating support piece is connected with the bottom end of the high-pressure flange at the lower end of the outer porcelain sleeve, the insulating support piece is of a cylindrical structure, and the diameter of the insulating support piece close to the bottom end is gradually reduced; the diameter of the capacitive screen is gradually reduced near the bottom end and extends along the contour of the inner wall of the insulating support; the bottom end of the capacitive screen and the bottom end of the lead tube are fixed in the insulating support piece; the bottom end of the insulating support piece is provided with a voltage-equalizing ball;
the oil tank module comprises an oil tank shell and an oil tank cover; the oil tank cover is arranged on the oil tank shell and connected through a bolt, and a wiring terminal is arranged on the side edge of the oil tank shell; an iron core module mounting seat is arranged on the bottom end face of the inner wall of the oil tank shell;
the iron core module is connected to an iron core module mounting seat in the oil tank shell, and comprises a primary winding, a secondary winding, an iron core and a winding framework; the iron core is connected to an iron core module mounting seat of the oil tank shell through angle steel; the secondary winding is wound on the iron core; the winding framework is nested on the secondary winding; the primary winding is wound on the winding framework to form a rectangle, a shielding layer is arranged on the outer layer of the primary winding, epoxy resin paint is coated on the outer surface of the shielding layer, and a plurality of insulating cable papers are wrapped on the shielding layer;
the primary winding and the secondary winding are wound by adopting enameled wires and glue-dispensing films, and a plurality of epoxy strips are arranged between the primary winding and the secondary winding and form a flow channel through the support of the epoxy strips.
Furthermore, a tail screen leading-out terminal is arranged on a high-pressure flange which is connected with the oil tank module and at the bottom end of the outer porcelain sleeve.
Furthermore, a wire outlet box is arranged on the wiring terminal on the oil tank shell.
Furthermore, the winding framework is an epoxy glass cylinder and is fixed on the iron core by a fixing ring.
Further, the outer shielding layer of the primary winding and the outer shielding layer of the secondary winding are both cable paper.
Furthermore, a plurality of air gaps are arranged in the core column of the iron core, and the air gaps and the core column of the iron core are cast into a whole by resin.
The invention has the advantages that:
1) according to the invention, the primary winding and the secondary winding are internally provided with the epoxy strips for supporting to form the flow channel, and the flowing heat dissipation in the oil tank module can increase the contact area with the winding, so that the heat in the winding can be taken away quickly, and the heat dissipation performance is improved; the outer layers of the primary winding and the secondary winding are provided with the cable paper for shielding, so that the electric field of a product can be effectively improved, and the partial discharge level of the product is reduced; the adhesive tape is adopted between the primary winding and the secondary winding, curing treatment is carried out before integral assembly, so that the primary winding and the secondary winding are of an integral structure, the integral strength of the winding is improved, the secondary winding is fixed on the framework, the framework is fixed on the iron core clamping piece through the fixing flange, and the integral fixation of the winding is reliable.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a structural view of a station voltage transformer of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A station voltage transformer as shown in fig. 1 includes an expander module 1, an insulator module 2, an oil tank module 3, and an iron core module 4; the expander module 1, the insulation module 2 and the oil tank module 3 are connected from top to bottom; the core module 4 is disposed within the tank module 3.
The expander module 1 includes an expander 11, an expander casing 12, and an upper cover plate 13; the lower end of the expander 11 is connected to the upper surface of the upper cover plate 13, the expander housing 12 houses the expander 11 and the lower end of the expander housing 12 is connected to the upper surface of the upper cover plate 13; the center of the upper cover plate 13 is provided with a through hole, and the bottom end edge of the upper cover plate 13 horizontally extends outward to form a primary terminal 14.
The insulator module 2 comprises an outer porcelain bushing 21, a lead tube 22, a capacitive screen 23 and an insulating support 24; the outer porcelain bushing 21 is in a cylindrical structure, and umbrella skirts are arranged on the outer contour of the outer porcelain bushing 21 and close to the upper end and the lower end; the top end of the outer porcelain bushing 21 is connected to the bottom end face of the upper cover plate 13 through a high-pressure flange, and the bottom end of the outer porcelain bushing 21 is connected to the oil tank module 3 through a high-pressure flange; the lead tube 22 is arranged along the axial direction of the outer porcelain sleeve 21, the top end of the lead tube 22 passes through a through hole in the middle of the upper cover plate 13 and extends into the expander 11, and the lead tube 22 passes through the outer porcelain sleeve 21 and extends into the oil tank module 3; the capacitive screen 23 is nested outside the lead tube 22, and the capacitive screen 23 is positioned between the inner wall of the outer porcelain sleeve 21 and the outer wall of the lead tube 22; the bottom end of the capacitive screen 23 extends into the tank module 3, and the bottom end of the capacitive screen 23 is supported by the insulating support member 24.
The insulating support piece 24 is arranged in the oil tank module 3, the top end of the insulating support piece 24 is connected with the bottom end of the high-pressure flange at the lower end of the outer porcelain sleeve 21, the insulating support piece 24 is of a cylindrical structure, and the diameter of the insulating support piece 24 close to the bottom end is gradually reduced; the capacitive screen 23 tapers in diameter near the bottom end and extends along the contour of the inner wall of the insulating support 24; the bottom end of the capacitive screen 23 and the bottom end of the lead tube 22 are fixed in the insulating support 24; the bottom end of the insulating support 24 is provided with a pressure equalizing ball 25.
The tank module 3 comprises a tank housing 31 and a tank cap 32; the fuel tank cover 32 is arranged on the fuel tank shell 31 and connected through bolts, and a wiring terminal 33 is arranged on the side of the fuel tank shell 31; an iron core module mounting seat is arranged on the bottom end face of the inner wall of the oil tank shell 31.
The iron core module 4 is connected to the iron core module mounting seat in the oil tank shell 31, and the iron core module 4 comprises a primary winding 41, a secondary winding 42, an iron core 43 and a winding framework 44; the iron core 43 is connected to the iron core module mounting seat of the oil tank shell 41 through angle steel; the secondary winding 42 is wound around the core 43; the winding framework 44 is nested on the secondary winding 42; the primary winding 41 is wound on the winding framework 44 to be rectangular, the outer layer of the primary winding 42 is provided with a shielding layer 45, the outer surface of the shielding layer 45 is coated with epoxy resin paint, and a plurality of insulating cable paper is wrapped; .
The primary winding 41 and the secondary winding 42 are wound by adopting enameled wires and glue-dispensing films, and a plurality of epoxy strips are arranged between the primary winding and the secondary winding and form a flow channel through the support of the epoxy strips.
And a tail screen leading-out terminal 26 is arranged on a high-pressure flange connected with the oil tank module 4 at the bottom end of the outer porcelain sleeve 21.
An outlet box 311 is provided on the terminal of the tank case 31.
The winding frame 44 is an epoxy glass cylinder and is fixed on the iron core by a fixing ring.
The outer shielding layer of the primary winding 41 and the outer shielding layer of the secondary winding 42 are both cable paper.
A plurality of air gaps are arranged in the core column of the iron core 43, and the air gaps and the core column of the iron core are integrally cast by resin.
The working principle of the invention is as follows: the primary terminal is connected with an ultrahigh voltage power supply, the voltage is reduced through the mutual inductance between the voltage-equalizing ball and the iron core module through an electric field in the insulating submodule of the expander, and epoxy strips are arranged in the primary winding and the secondary winding to support and form a flow channel, so that the heat dissipation performance is improved; and then the oil tank is conveyed through a connecting terminal on the oil tank module.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. The utility model provides a voltage transformer is used in station which characterized in that: the expansion device comprises an expander module, an insulation submodule, an oil tank module and an iron core module; the expander module, the insulation module and the oil tank module are connected from top to bottom; the iron core module is arranged in the oil tank module;
the expander module comprises an expander, an expander cover and an upper cover plate; the bottom end of the expander is connected to the upper surface of the upper cover plate, the expander is covered by the expander cover, and the bottom end of the expander cover is connected to the upper surface of the upper cover plate; a through hole is formed in the center of the upper cover plate, and a primary terminal horizontally extends outwards from the edge of the bottom end of the upper cover plate;
the insulating submodule comprises an outer porcelain sleeve, a lead tube, a capacitive screen and an insulating support piece; the outer porcelain bushing is of a cylindrical structure, and umbrella skirts are arranged on the outer contour of the outer porcelain bushing and close to the upper end and the lower end; the top end of the outer porcelain sleeve is connected to the bottom end face of the upper cover plate through a high-pressure flange, and the bottom end of the outer porcelain sleeve is connected to the oil tank module through a high-pressure flange; the lead pipe is arranged along the axial direction of the outer porcelain sleeve, the top end of the lead pipe penetrates through a through hole in the middle of the upper cover plate and extends into the expander, and the lead pipe penetrates through the outer porcelain sleeve and extends into the oil tank module; the capacitive screen is nested outside the lead tube and is positioned between the inner wall of the outer porcelain sleeve and the outer wall of the lead tube; the bottom end of the capacitive screen is arranged in the oil tank module along the edge, and the bottom end of the capacitive screen is supported by the insulating support piece;
the insulating support piece is arranged in the oil tank module, the top end of the insulating support piece is connected with the bottom end of the high-pressure flange at the lower end of the outer porcelain sleeve, the insulating support piece is of a cylindrical structure, and the diameter of the insulating support piece close to the bottom end is gradually reduced; the diameter of the capacitive screen is gradually reduced near the bottom end and extends along the contour of the inner wall of the insulating support; the bottom end of the capacitive screen and the bottom end of the lead tube are fixed in the insulating support piece; the bottom end of the insulating support piece is provided with a voltage-equalizing ball;
the oil tank module comprises an oil tank shell and an oil tank cover; the oil tank cover is arranged on the oil tank shell and connected through a bolt, and a wiring terminal is arranged on the side edge of the oil tank shell; an iron core module mounting seat is arranged on the bottom end face of the inner wall of the oil tank shell;
the iron core module is connected to an iron core module mounting seat in the oil tank shell, and comprises a primary winding, a secondary winding, an iron core and a winding framework; the iron core is connected to an iron core module mounting seat of the oil tank shell through angle steel; the secondary winding is wound on the iron core; the winding framework is nested on the secondary winding; the primary winding is wound on the winding framework to form a rectangle, a shielding layer is arranged on the outer layer of the primary winding, epoxy resin paint is coated on the outer surface of the shielding layer, and a plurality of insulating cable papers are wrapped on the shielding layer;
the primary winding and the secondary winding are wound by adopting enameled wires and glue-dispensing films, and a plurality of epoxy strips are arranged between the primary winding and the secondary winding and form a flow channel through the support of the epoxy strips.
2. A station voltage transformer according to claim 1, characterized in that: and a tail screen leading-out terminal is arranged on a high-pressure flange connected with the bottom end of the outer porcelain sleeve and the oil tank module.
3. A station voltage transformer according to claim 1, characterized in that: and a wire outlet box is arranged on the wiring terminal on the oil tank shell.
4. A station voltage transformer according to claim 1, characterized in that: the winding framework is an epoxy glass cylinder and is fixed on the iron core by a fixing ring.
5. A station voltage transformer according to claim 1, characterized in that: and the outer shielding layer of the primary winding and the outer shielding layer of the secondary winding are both cable paper.
6. A station voltage transformer according to claim 1, characterized in that: a plurality of air gaps are arranged in the core column of the iron core, and the air gaps and the core column of the iron core are cast into a whole by resin.
CN202011029667.6A 2020-09-27 2020-09-27 Voltage transformer for station Pending CN112071576A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011029667.6A CN112071576A (en) 2020-09-27 2020-09-27 Voltage transformer for station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011029667.6A CN112071576A (en) 2020-09-27 2020-09-27 Voltage transformer for station

Publications (1)

Publication Number Publication Date
CN112071576A true CN112071576A (en) 2020-12-11

Family

ID=73682705

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011029667.6A Pending CN112071576A (en) 2020-09-27 2020-09-27 Voltage transformer for station

Country Status (1)

Country Link
CN (1) CN112071576A (en)

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