CN202796409U - Dry type voltage transformer for switchgears - Google Patents

Dry type voltage transformer for switchgears Download PDF

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Publication number
CN202796409U
CN202796409U CN 201220352567 CN201220352567U CN202796409U CN 202796409 U CN202796409 U CN 202796409U CN 201220352567 CN201220352567 CN 201220352567 CN 201220352567 U CN201220352567 U CN 201220352567U CN 202796409 U CN202796409 U CN 202796409U
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CN
China
Prior art keywords
winding
low
voltage
iron core
type voltage
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.)
Withdrawn - After Issue
Application number
CN 201220352567
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Chinese (zh)
Inventor
马晓彬
惠兆鹏
李中男
王继元
于敬宏
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.)
Dalian No1 Instrument Transformer Co Ltd
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Dalian No1 Instrument Transformer Co Ltd
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Priority to CN 201220352567 priority Critical patent/CN202796409U/en
Application granted granted Critical
Publication of CN202796409U publication Critical patent/CN202796409U/en
Anticipated expiration legal-status Critical
Withdrawn - After Issue legal-status Critical Current

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Abstract

The utility model relates to a dry type voltage transformer for switchgears. The dry type voltage transformer is characterized in that two balancing windings identical in turns and geometric dimension are arranged on two stems of a rectangular core respectively, serially-connected high-voltage primary windings which are identical in turns and geometric dimension and mutually serially connected are arranged outside the two balancing windings respectively, serially-connected joints are in equipotential bonding with the core, a low-voltage secondary winding is arranged outside one high-voltage primary winding, an insulation lifting part is arranged on the side of the low-voltage winding, one end of the insulation lifting part is fixed on a yoke of the core, a buffering and shielding layer with a certain curvature radius is arranged outside each of the high-voltage primary windings, the low-voltage secondary winding, the exposed core, a high-voltage lead and a low-voltage lead, an insulation protector is arranged outside a body of the dry type voltage transformer, and an aluminum coating layer and a stainless steel shell are sequentially arranged on the surface of the insulation protector located outside a switchgear gas chamber. The dry type voltage transformer has the advantages that excitation loss of the core is reduced, no-load current is low, overvoltage withstanding capability is high, and operating requirements of 66kV switchgears can be met.

Description

The switchgear dry-type voltage inductor
Technical field
The utility model relates to 66kV gas-insulated switchgear dry-type voltage inductor in a kind of voltage transformer, particularly electrical power distribution system.
Background technology
Along with 66kV gas-insulated switchgear C-GIS in the electrical power distribution system to miniaturization, intellectuality and structural module future development, the switchgear volume is compared legacy equipment and has been reduced nearly 2/3.Existing for the voltage transformer on the 66kV switchgear, because of its iron core, be wound on winding of high pressure on the iron core and the parts such as low-pressure secondary winding and balance winding structural design reasonable not, and adopt transformer oil as compound inslation, so that the volume of voltage transformer is large, Heavy Weight can not satisfy the instructions for use of miniaturization switchgear.And with the dry-type voltage inductor of poured with epoxy resin; although have the advantages such as volume is little, totally-enclosed, nothing is oily, non-maintaining; but because of the electric pressure of insulation protection lower; being only suitable for low in electric pressure is the occasion use of 40kV and following electric pressure; be used on the switchgear of 66kV; puncture easily, affect the normal operation of electrical network, the scope of application is restricted.
Summary of the invention
The purpose of this utility model is to provide that a kind of volume is little, coefficient of safety is high, non-maintaining, the dry-type voltage inductor that can use at the high voltage switchgear of 66kV voltage level.
The technical solution of the utility model is: a kind of switchgear dry-type voltage inductor; comprise insulating protector; the insulating hanging piece installing; winding of high pressure; the low-pressure secondary winding; the balance winding; iron core; it is characterized in that being respectively equipped with the number of turn and the identical balance winding of physical dimension on two stem stems of rectangle iron core; be respectively equipped with winding of Cascade high pressure of the number of turn and mutual serial connection identical with physical dimension in the outside of two balance windings; the series connection joint is done equipotential with iron core and is connected; wherein the outside of a winding of a high pressure is provided with the low-pressure secondary winding; the insulating hanging piece installing is arranged on low pressure winding side; the one end is fixed on the iron yoke of iron core; at winding of high pressure; the low-pressure secondary winding; exposed iron core and height; the outside of low-voltage lead is provided with the buffering screen of certain curvature radius and thickness; by the insulating hanging piece installing; winding of high pressure; the low-pressure secondary winding; the balance winding; iron core forms the device body of dry-type voltage inductor; its outside is provided with the insulating protector that is formed by poured with epoxy resin, and the surface of insulating protector is provided with aluminum membranous layer and Stainless Steel Shell successively.
Described insulating hanging piece installing is to be connected and composed by metallic interconnect and insulation lifting post, metallic interconnect one end is tapered, and be positioned at insulation lifting post, the metallic interconnect tapered tip is provided with steel ball, and the insulation lifting post perisporium corresponding with steel ball is provided with the shield member of most advanced and sophisticated shielding.
The insulation lifting post perisporium corresponding with steel ball is provided with annular gathering sill, is provided with the shield member for the tip shielding in the gathering sill.
Described shield member is the shielding spring circle.
Described buffering screen is to be made of internal layer resilient coating and outer screen two parts, and wherein the internal layer resilient coating adopts elastomeric material to make, and outer screen is made by semi-conducting material.
The utility model has adopted that to have an excitation loss low, no-load current is little, bear the high rectangle iron core of overvoltage ability, can tackle the overvoltage that produces because of a variety of causes in the electric power networks system, the number of turn and the identical balance winding of physical dimension are set respectively on two stem stems of rectangle iron core, with the magnetomotive force of two stem stems of balanced core, increase the magnetic coupling effect.Winding of high pressure is divided into the number of turn and the equal two-stage of physical dimension, and the balance winding that is wound on respectively on rectangle iron core two stem stems is outside, and the series connection joint is done equipotential with iron core and connected.The low-pressure secondary winding technique is in the outside of a winding of a high pressure.Be provided with the buffering screen of certain curvature radius and thickness in the outside of winding of high pressure, low-pressure secondary winding, exposed iron core and high and low pressure lead-in wire; the device body that is formed dry-type voltage inductor by insulating hanging piece installing, winding of high pressure, low-pressure secondary winding, balance winding, iron core; device body external vacuum casting epoxy resin forms insulating protector, and the shape of insulating protector can be made various geometries according to designing requirement.Be provided with the buffering screen that is consisted of by internal layer resilient coating and outer screen two parts, wherein resilient coating adopts elastomeric material to make, such as compressed sponge and silastic material, screen has semi-conducting material to make, such as semiconductor adhesive tape and semiconductor crimped paper, the various stress of generation when moving to eliminate epoxy resin cure moulding or product, and improve field strength distribution.The lifting iron core reaches at iron core the used insulating hanging piece installing of other parts is installed in the voltage transformer manufacture process, to be consisted of by metallic interconnect and insulation lifting post, one end of metallic interconnect is fixed on the iron core iron yoke, the tapered other end is cast in the insulation lifting post, be connected with steel ball in its tapered tip, arranging of steel ball can prevent the concentrated discharge of metallic interconnect point, uniform electric field distributes, can also prevent effectively simultaneously that metallic interconnect from separating with insulation lifting post, guarantees the reliability that connects.Be provided with annular gathering sill at the insulation lifting post perisporium corresponding with steel ball, be provided with shield member in the gathering sill, shield member is connected with the screen of iron core outside, further optimizes inner field strength distribution, and is thoroughly that the most advanced and sophisticated shielding of internal high pressure is inner at high voltage electric field.After blasting treatment is carried out in voltage transformer insulation protection surface; spray one deck aluminum membranous layer; the outer surface of aluminum membranous layer is fixed on Stainless Steel Shell on the insulating protector by connector; the aluminum membranous layer of non-magnet_conductible material and Stainless Steel Shell; the internally charged device body shielding of voltage transformer is inner at insulating protector; making product external surfaces discharge probability is zero, and the electric property of product is better.
Characteristics of the present utility model are: adopted rectangle iron core and distributed rational high and low pressure winding and balance winding, dwindled the volume of product, reduced the iron core excitation loss, no-load current is little, it is high to bear the overvoltage ability, overvoltage factor is brought up to 2.5 times by 1.9 times of national standard, can tackle the overvoltage that produces because of a variety of causes in the network system; In advance cast is adopted in the insulating hanging piece installing, and the insulating hanging piece installing is identical with the insulating protector material, and dielectric constant is consistent, has improved the dielectric strength between charged iron core and the instrument transformer external ground position; Spherical steel ball, the design of shielding spring and gathering sill, improved Electric Field Distribution, thoroughly eliminated too to concentrate because of electric field and point discharge occurred, reduce the product partial discharge quantity, made the electric property of product be better than national instrument transformer standard-required, can the office of accomplishing put extinction voltage 100kV, surpass national Specification under the measuring voltage of 87kV, the requirement less than 50pC is put in office; Product external discharge projection has been eliminated in the full-shield measure of aluminum membranous layer and Stainless Steel Shell fully; By the design to voltage transformer, reducing under the condition of volume, can satisfy the instructions for use of 66kV switchgear fully.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of the utility model insulating hanging piece installing.
Embodiment
Below in conjunction with accompanying drawing the utility model is further specified.
As shown in Figure 1, the 66kV switchgear is rectangle with the iron core 7 of dry-type voltage inductor, material is 27ZH105, it is 2.5 that iron core bears the overvoltage factor, in order to increase the magnetic coupling effect, at two stem stems of iron core the number of turn and the identical balance winding 6 of physical dimension are set respectively, with the magnetomotive force of two stem stems of balanced core, increase the magnetic coupling effect.Winding of high pressure 4 adopts Cascade to connect, the two-stage that the number of turn and physical dimension equate is set, be wound on respectively on two stem stems of iron core, and be positioned at the outside of balance winding, the place of being connected in series of a winding of high pressure and iron core the voltage such as are done and are connected, and iron core of voltage transformer only bears the rated primary voltage of 1 ∕ 2, adopts the structure of this step pressure reducing, both the interiors of products Electric Field Distribution can be improved, the volume of product can be reduced again.Outer surface coiling low-pressure secondary winding 5 at a winding of a high pressure.Make voltage transformer for the ease of lifting, by on the iron core iron yoke of low-pressure secondary winding side respectively symmetry be fixedly connected with insulating hanging piece installing 14, the insulating hanging piece installing is to be connected and composed by metallic interconnect 19 and insulation lifting post 20, see Fig. 2, metallic interconnect one end is fixedly connected on the iron core iron yoke, the other end is tapered to be embedded in the insulation lifting post, tapered tip is welded with steel ball 12, the insulation lifting post perisporium relative with steel ball is provided with annular gathering sill 13, and the shield member that is provided with in the gathering sill for the tip shielding is shielding spring 15.At winding of high pressure, the low-pressure secondary winding, the balance winding, exposed iron core and height, low-voltage lead 10,16 outside is provided with buffering screen 21, it is made of internal layer resilient coating and outer screen, resilient coating is made by compressed sponge and silicon rubber bi-material, screen is that semiconductor adhesive tape and semiconductor crimped paper are made, the buffering shielding thickness is 1.8/100 of this thickness direction total length of instrument transformer, cushion the full-shield that has realized instrument transformer that arranges of screen, by eliminating stress and improving Electric Field Distribution, guarantee instrument transformer volume reduce with the high condition of electric pressure under safe and reliable operation.Casting epoxy resin forms insulating protector 3 under the external vacuum condition of instrument transformer device body; the geomery of insulating protector is determined according to installing space and designing requirement; be installed in the outer insulating protector of switchgear air chamber; its exposed surface carries out spraying one deck aluminum membranous layer 2 after the blasting treatment again; the outer surface of aluminum membranous layer is provided with Stainless Steel Shell 1, is fixedly connected on the insulating protector by connector.Aluminum membranous layer and Stainless Steel Shell at the outer setting non-magnet_conductible material of the epoxy resins insulation protective of voltage transformer realize the voltage transformer full-shield, and making voltage transformer outer surface discharge probability is zero.The high-voltage connection end of voltage transformer is provided with insulated column 11, mounting flange 8 and insulating sleeve 9, insulating sleeve is taper, and its surface requirements is bright and clean, and size is accurate, with guarantee with the C-GIS air chamber in the inner cone insulator correctly cooperate, avoid occuring high pressure along the face creepage phenomenon.The end of low-voltage lead is provided with metal cable waterproof connector 17.For convenient mobile and installation, arrange four on the top of product suspension ring 18 are installed.

Claims (5)

1. switchgear dry-type voltage inductor; comprise insulating protector; the insulating hanging piece installing; winding of high pressure; the low-pressure secondary winding; the balance winding; iron core; it is characterized in that being respectively equipped with the number of turn and the identical balance winding of physical dimension on two stem stems of rectangle iron core; be respectively equipped with winding of Cascade high pressure of the number of turn and mutual serial connection identical with physical dimension in the outside of two balance windings; the series connection joint is done equipotential with iron core and is connected; wherein the outside of a winding of a high pressure is provided with the low-pressure secondary winding; the insulating hanging piece installing is arranged on low pressure winding side; the one end is fixed on the iron yoke of iron core; at winding of high pressure; the low-pressure secondary winding; exposed iron core and height; the outside of low-voltage lead is provided with the buffering screen of certain curvature radius and thickness; by the insulating hanging piece installing; winding of high pressure; the low-pressure secondary winding; the balance winding; iron core forms the device body of dry-type voltage inductor; its outside is provided with the insulating protector that is formed by poured with epoxy resin, and the surface of insulating protector is provided with aluminum membranous layer and Stainless Steel Shell successively.
2. switchgear dry-type voltage inductor according to claim 1, it is characterized in that described insulating hanging piece installing is to be connected and composed by metallic interconnect and insulation lifting post, metallic interconnect one end is tapered, and be positioned at insulation lifting post, the metallic interconnect tapered tip is provided with steel ball, and the insulation lifting post perisporium corresponding with steel ball is provided with the shield member of most advanced and sophisticated shielding.
3. switchgear dry-type voltage inductor according to claim 1 is characterized in that the insulation lifting post perisporium corresponding with steel ball is provided with annular gathering sill, is provided with the shield member for the tip shielding in the gathering sill.
4. switchgear dry-type voltage inductor according to claim 3 is characterized in that described shield member is the shielding spring circle.
5. switchgear dry-type voltage inductor according to claim 1, it is characterized in that described buffering screen is to be made of internal layer resilient coating and outer screen two parts, wherein the internal layer resilient coating adopts elastomeric material to make, and outer screen is made by semi-conducting material.
CN 201220352567 2012-07-20 2012-07-20 Dry type voltage transformer for switchgears Withdrawn - After Issue CN202796409U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220352567 CN202796409U (en) 2012-07-20 2012-07-20 Dry type voltage transformer for switchgears

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220352567 CN202796409U (en) 2012-07-20 2012-07-20 Dry type voltage transformer for switchgears

Publications (1)

Publication Number Publication Date
CN202796409U true CN202796409U (en) 2013-03-13

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CN 201220352567 Withdrawn - After Issue CN202796409U (en) 2012-07-20 2012-07-20 Dry type voltage transformer for switchgears

Country Status (1)

Country Link
CN (1) CN202796409U (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103325543A (en) * 2013-06-21 2013-09-25 河南开启电力实业有限公司 Transformer high-voltage side accessory power supply and manufacturing method thereof
CN103578725A (en) * 2012-07-20 2014-02-12 大连第一互感器有限责任公司 Dry type voltage transformer for switchgear
CN104144600A (en) * 2013-08-19 2014-11-12 国家电网公司 Shielding ring, shielding structure and poured voltage transformer
CN105845409A (en) * 2016-03-17 2016-08-10 广东四会互感器厂有限公司 Current transformer with secondary current conversion function

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103578725A (en) * 2012-07-20 2014-02-12 大连第一互感器有限责任公司 Dry type voltage transformer for switchgear
CN103578725B (en) * 2012-07-20 2016-04-13 大连第一互感器有限责任公司 Dry type voltage transformer for switchgear
CN103325543A (en) * 2013-06-21 2013-09-25 河南开启电力实业有限公司 Transformer high-voltage side accessory power supply and manufacturing method thereof
CN104144600A (en) * 2013-08-19 2014-11-12 国家电网公司 Shielding ring, shielding structure and poured voltage transformer
CN105845409A (en) * 2016-03-17 2016-08-10 广东四会互感器厂有限公司 Current transformer with secondary current conversion function
CN105845409B (en) * 2016-03-17 2017-03-15 广东四会互感器厂有限公司 A kind of current transformer with secondary current translation function

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
EE01 Entry into force of recordation of patent licensing contract

Assignee: Dalian Jinye Electric Power Equipment Co., Ltd.

Assignor: Dalian No.1 Instrument Transformer Co., Ltd.

Contract record no.: 2014990000027

Denomination of utility model: Dry type voltage transformer for switchgear

Granted publication date: 20130313

License type: Exclusive License

Record date: 20140113

LICC Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model
AV01 Patent right actively abandoned

Granted publication date: 20130313

Effective date of abandoning: 20160413

C25 Abandonment of patent right or utility model to avoid double patenting