CN107424813A - Solve the outer net cage of railway and become the voltage transformer and method for using voltage transformer shelf depreciation - Google Patents

Solve the outer net cage of railway and become the voltage transformer and method for using voltage transformer shelf depreciation Download PDF

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Publication number
CN107424813A
CN107424813A CN201710340706.6A CN201710340706A CN107424813A CN 107424813 A CN107424813 A CN 107424813A CN 201710340706 A CN201710340706 A CN 201710340706A CN 107424813 A CN107424813 A CN 107424813A
Authority
CN
China
Prior art keywords
phases
bags
voltage transformer
bag
terminal sleeve
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Withdrawn
Application number
CN201710340706.6A
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Chinese (zh)
Inventor
滕守全
荣香倩
梁立萍
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 No2 Instrument Transformer Co Ltd
Original Assignee
Dalian No2 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 Dalian No2 Instrument Transformer Co Ltd filed Critical Dalian No2 Instrument Transformer Co Ltd
Priority to CN201710340706.6A priority Critical patent/CN107424813A/en
Publication of CN107424813A publication Critical patent/CN107424813A/en
Withdrawn legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20Instruments transformers
    • H01F38/22Instruments transformers for single phase ac
    • H01F38/24Voltage transformers
    • H01F38/26Constructions
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L63/00Compositions of epoxy resins; Compositions of derivatives of epoxy resins
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/02Casings
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/30Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306Fastening or mounting coils or windings on core, casing or other support
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/34Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36Electric or magnetic shields or screens
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/40Structural association with built-in electric component, e.g. fuse
    • H01F27/402Association of measuring or protective means
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00Applications
    • C08L2203/20Applications use in electrical or conductive gadgets

Abstract

Solve the outer net cage of railway and become the voltage transformer for using voltage transformer shelf depreciation, insulation shell sub-surface is embedded with the gauze screen of metal.Insulation shell body front surface is provided with threephase cable joint, and the inside is respectively equipped with three A facies tract screw rod fuses, and its inner termination is located at terminal sleeve of three-phase respectively.AB bag primary windings both ends connect terminal sleeve of terminal sleeve of A phases and B phases respectively.BC bag primary windings both ends connect terminal sleeve of terminal sleeve of C phases and B phases respectively.AB bags secondary skeleton, AB bags secondary coil, epoxy backbone of AB bags and AB bag primary windings are cased with the outside of AB iron clads core.BC pack arrangements are identical.Epoxy backbone is as insulation once.There is all-metal gauze screen outside device body, reached zero potential outside transformer.Electric fields uniform, effect shielding electric discharge are made using a terminal sleeve.Primary connection mode is designed easy-to-use using plug and play.

Description

Solve the outer net cage of railway become with the voltage transformer of voltage transformer shelf depreciation and Method
Technical field
Patent of the present invention is related to voltage transformer field, more particularly to net cage change voltage transformer office outside solution railway The voltage transformer and method of portion's electric discharge.
Background technology
The rapid development of China Express Railway net, the requirement to safety and reliability is extremely strict, Line for Passenger Transportation be with Two-wire electrification speed rail based on passenger traffic, speed per hour 200 to 350km/h, sweep typically in more than 2200m, it communicates, The safety, on schedule for the long-distance centralized control of train commander, management service, ensureing bullet train is realized in the design of signal, is met Quick, comfortable, safe, on schedule demand of the passenger to travelling by bus.
The design of Line for Passenger Transportation telecontrol cubicle-type transformer, which fully takes into account, to be met that high-speed railway power-supply system is highly reliable, exempts to tie up The needs of shield, using SF6 all insulations, hermetically sealed inflatable structure, using joint brand breaker, switch is electronic behaviour Make, signal is uploaded into telecontrol system, realizes that three is distant, its configuration is more high-grade, and design is more humane, and above-mentioned institute's functional is realized all From not operation power, and 220V power supplys are provided by dedicated potential transformer, therefore the reliability of voltage transformer is aobvious more Aggravate to want, once PT is damaged, all low-voltage control signals that case becomes all interrupt, and the safe operation to train can produce can not be pre- The consequence of material.And the most important index of PT reliabilities is exactly partial discharge quantity, a kind of voltage transformer is invented for this case, Successfully this PT is set to have reached without shelf depreciation.
The content of the invention
It is an object of the present invention to provide the mutual induction of voltage for solving net cage change voltage transformer shelf depreciation outside railway Device, it is a further object to provide the method for solving net cage change voltage transformer shelf depreciation outside railway.
The technical scheme of use is:
Solve the outer net cage of railway and become the voltage transformer for using voltage transformer shelf depreciation, including insulation shell.
Technical points are:
The gauze screen of metal, gauze screen connection footing inserts are embedded with the sub-surface of insulation shell, insulation shell passes through bottom Pin inserts is fixed on mounting base, there is earthing screw on mounting base.
A phases cable connector, B phases cable connector and C phase cable connectors are provided with the preceding surface of insulation shell, the inside is set respectively There are A facies tract screw rods fuse, B facies tract screw rod fuses and C facies tract screw rod fuses.
In insulation shell, A facies tract screw rods fuse is inner in terminal sleeve of A phases, in B facies tract screw rod fuses In terminal sleeve of B phases, C facies tract screw rods fuse is inner in terminal sleeve of C phases at end.
Terminal sleeve of A phases connects one end of AB bag primary windings by A bag A phases suspension bracket.
The other end of AB bag primary windings connects B terminal sleeve of phase by A bag B phases bonding jumper.
Terminal sleeve of B phases connects one end of BC bag primary windings by B bag B phases bonding jumper.
The other end of BC bag primary windings connects C terminal sleeve of phase by B bag C phases suspension bracket.
There are AB iron clad cores in insulation shell, AB bag secondary skeletons, AB bags secondary skeleton outside are cased with the outside of AB iron clads core There are an AB bag secondary coils, there is epoxy backbone of AB bags on the outside of AB bags secondary coil, outside epoxy backbone of AB bags There are AB bag primary windings side.
AB bag secondary coils are connected with secondary connection inserts.
There are BC iron clad cores in insulation shell, BC bag secondary skeletons, BC bags secondary skeleton outside are cased with the outside of BC iron clads core There are a BC bag secondary coils, there is epoxy backbone of BC bags on the outside of BC bags secondary coil, outside epoxy backbone of BC bags There are BC bag primary windings side.
BC bag secondary coils are connected with secondary connection inserts.
Solve the outer net cage of railway and become the method for using voltage transformer shelf depreciation, it is characterised in that comprise the following steps:
The sub-surface of insulation shell is embedded with the gauze screen of metal the step of.
Also include:
There is the step of epoxy backbone of AB bags on the outside of AB bags secondary coil.
There is the step of epoxy backbone of BC bags on the outside of BC bags secondary coil.
A terminal sleeve of phase, terminal sleeve of B phases, terminal sleeve of C phases are set in insulation shell.
A facies tracts screw rod fuse is inner in terminal sleeve of A phases in insulation shell, in B facies tract screw rod fuses End is in terminal sleeve of B phases, the inner step in terminal sleeve of C phases of C facies tract screw rods fuse.
It the advantage is that:
Using epoxy backbone as insulation once, the method that kraft capacitor paper does major insulation is eliminated.Make device body insulation material The uniformity of dielectric coefficient is reached between material and major insulation material.
Install all-metal gauze screen outside device body additional, be effectively isolated influence of the external electrical field to transformer, and reached mutual Zero potential outside sensor, powered can be touched.
One time lead terminal uses a terminal sleeve, not only makes a HV Terminal electric fields uniform but also effectively in shielding Put the electric discharge of fuse.
Primary connection mode is designed using the brand new ideas of plug and play, has been reached high security and high convenience, has been prevented The presence of artificial potential safety hazard.
Prioritization scheme is adopted in configuration design, under limited appearance and size, external insulation meets III grade of gradation for surface pollution, significantly increases Anti-dewing ability under strong wet environment.
Polyurethane composition is added in epoxide resin material, not only significantly enhances high-low temperature capabilities.And substantially reduce Unit electric field intensity.
Brief description of the drawings
Fig. 1 is the front view of the present invention.
Fig. 2 is the side view of the present invention.
Fig. 3 is the top view of the present invention.
AB bags primary winding 1, epoxy backbone 2 of AB bags, AB bag secondary connections inserts 3, AB bags secondary coil 4, AB bags secondary skeleton 5, gauze screen 6, AB iron clads core 7, suspension bracket 8, secondary terminal box 9, the earthing screw 11 of secondary outgoing line mouth 10, installation Bottom plate 12, insulation shell 13, terminal sleeve 14 of C phases, C facies tract screw rods fuse 15, C phases cable connector 16, A bag A phase suspension brackets 17th, A bags B phases bonding jumper 18, B bag B phases bonding jumper 19, B bag C phases suspension bracket 20, footing inserts 21, AB bag secondary connection screws 22。
Embodiment
Solve the outer net cage of railway and become the voltage transformer for using voltage transformer shelf depreciation, including insulation shell 13.
The gauze screen 6 of metal is embedded with the sub-surface of insulation shell 13, gauze screen 6 connects footing inserts 21, insulation Housing 13 is fixed on mounting base 12 by footing inserts 21, there is earthing screw 11 on mounting base 12.Mounting base 12 is Metallic plate.
A phases cable connector, B phases cable connector and C phases cable connector 16, the inside point are provided with the preceding surface of insulation shell 13 She You not A facies tract screw rods fuse, B facies tract screw rod fuses and C facies tract screw rods fuse 15.
In insulation shell 13, A facies tract screw rods fuse is inner in terminal sleeve of A phases, B facies tract screw rod fuses In terminal sleeve of B phases, C facies tract screw rods fuse is inner in terminal sleeve 14 of C phases for the inner.
Terminal sleeve of A phases connects one end of AB bags primary winding 1 by A bag A phases suspension bracket 17.
The other end of AB bags primary winding 1 connects B terminal sleeve of phase by A bag B phases bonding jumper 18.
Terminal sleeve of B phases connects one end of BC bag primary windings by B bag B phases bonding jumper 19.
The other end of BC bag primary windings connects C terminal sleeve 14 of phase by B bag C phases suspension bracket 20.
There is AB iron clads core 7 in insulation shell 13, the outside of AB iron clads core 7 is cased with AB bags secondary skeleton 5, AB bag secondary skeletons There is AB bags secondary coil 4 in 5 outsides, and there are epoxy backbone 2 of AB bags, asphalt mixtures modified by epoxy resin of AB bags in the outside of AB bags secondary coil 4 There is AB bags primary winding 1 in the outside of fat skeleton 2.
AB bag secondary connections inserts 3 is welded with the lead of AB bags secondary coil 4, there are AB bags two on AB bag secondary connections inserts 3 Secondary terminal screw 22.
There are BC iron clad cores in insulation shell 13, be cased with BC bag secondary skeletons on the outside of BC iron clads core, outside BC bag secondary skeletons There are BC bag secondary coils side, has epoxy backbone of BC bags, epoxy backbone of BC bags on the outside of BC bags secondary coil There is the step of BC bag primary windings in outside.
BC bag secondary connection inserts is welded with BC bag secondary coil leads, has BC bags are secondary to connect on BC bag secondary connection inserts Line screw.
AB bag secondary connections inserts 3 and BC bag secondary connection inserts are respectively positioned in secondary terminal box 9, and secondary terminal box 9 has Secondary outgoing line mouth 10.There is suspension bracket 8 on mounting base 12.
The composition of insulation shell 13 includes epoxy resin, curing agent, silicon powder, polyurethane and coloring agent, and mass ratio is: Epoxy resin:Curing agent:Silicon powder:Polyurethane, coloring agent=100:80:260:5%(For the 5% of epoxy resin quality):4‰(For The 4 ‰ of epoxy resin quality).
Epoxy resin:Indoor vapour bar CY5526.
Curing agent:Indoor vapour bar HY5526.
Silicon powder:400 mesh.
Coloring agent is the conventional coloring agent of transformer insulation crust.
AB iron clads core 7 and BC iron clads core are set for left and right, A phases cable connector, B phases cable connector and C phases cable connector 16 It is located at the upper left side of AB iron clads core 7, AB iron clads core 7 and BC iron clads core top and BC iron clad cores upper right side respectively.
Solve the outer net cage of railway and become the method for using voltage transformer shelf depreciation, including:
The sub-surface of insulation shell 13 is embedded with gauze screen 6 of metal the step of.
Also include:
A phases cable connector, B phases cable connector and C phases cable connector 16 are provided with the preceding surface of insulation shell 13, the inside is set respectively There is the step of A facies tract screw rods fuse, B facies tract screw rod fuses and C facies tract screw rod fuse 15.
A facies tracts screw rod fuse is inner in terminal sleeve of A phases in insulation shell 13, B facies tract screw rod fuses The inner is in terminal sleeve of B phases, the inner step in terminal sleeve 14 of C phases of C facies tract screw rods fuse.
Terminal sleeve of A phases is connected to one end of AB bags primary winding 1 by A bag A phases suspension bracket 17.
The step of other end of AB bags primary winding 1 is connected into terminal sleeve of B phases by A bag B phases bonding jumper 18.
Terminal sleeve of B phases is connected to one end of BC bag primary windings by B bag B phases bonding jumper 19.
The step of other end of BC bag primary windings connects C terminal sleeve 14 of phase by B bag C phases suspension bracket 20.
AB iron clads core 7 is provided with insulation shell 13, the outside of AB iron clads core 7 is cased with AB bags secondary skeleton 5, and AB bags are secondary There is AB bags secondary coil 4 in the outside of skeleton 5, and there are epoxy backbone 2 of AB bags, the secondary ring of AB bags one in the outside of AB bags secondary coil 4 There is the step of AB bags primary winding 1 in the outside of oxygen resin matrix 2.
AB bag secondary connections inserts 3 is welded with the lead of AB bags secondary coil 4, there are AB bags two on AB bag secondary connections inserts 3 Secondary terminal screw.
There are BC iron clad cores in insulation shell 13, be cased with BC bag secondary skeletons on the outside of BC iron clads core, outside BC bag secondary skeletons There are BC bag secondary coils side, has epoxy backbone of BC bags, epoxy backbone of BC bags on the outside of BC bags secondary coil There is the step of BC bag primary windings in outside.
BC bag secondary connection inserts is welded with the lead of BC bags secondary coil 4, there are BC bags secondary on BC bag secondary connection inserts Terminal screw.
AB bag secondary connections inserts 3 and BC bag secondary connection inserts are respectively positioned in secondary terminal box 9, and secondary terminal box 9 has Secondary outgoing line mouth 10.There is suspension bracket 8 on mounting base 12.
The composition of insulation shell 13 includes epoxy resin, curing agent, silicon powder, polyurethane and coloring agent, and mass ratio is: Epoxy resin:Curing agent:Silicon powder:Polyurethane, coloring agent=100:80:260:5%(For the 5% of epoxy resin quality):4‰(For The 4 ‰ of epoxy resin quality).
Epoxy resin:Indoor vapour bar CY5526.
Curing agent:Indoor vapour bar HY5526.
Silicon powder:400 mesh.

Claims (10)

1. solving the outer net cage of railway becomes the voltage transformer for using voltage transformer shelf depreciation, it is characterised in that:Including insulation shell Body (13);
The gauze screen (6) of metal is embedded with the sub-surface of insulation shell (13), gauze screen (6) connects footing inserts (21), Insulation shell (13) is fixed on mounting base (12) by footing inserts (21), and mounting base has earthing screw on (12) (11);
A phases cable connector, B phases cable connector and C phases cable connector (16), the inside point are provided with the preceding surface of insulation shell (13) She You not A facies tract screw rods fuse, B facies tract screw rod fuses and C facies tract screw rod fuses (15);
In insulation shell (13), A facies tract screw rods fuse is inner in terminal sleeve of A phases, in B facies tract screw rod fuses In terminal sleeve of B phases, C facies tract screw rods fuse is inner in terminal sleeve (14) of C phases at end;
Terminal sleeve of A phases connects one end of AB bags primary winding (1) by A bag A phases suspension brackets (17);
The other end of AB bags primary winding (1) connects B terminal sleeve of phase by A bag B phases bonding jumpers (18);
Terminal sleeve of B phases connects one end of BC bag primary windings by B bag B phases bonding jumpers (19);
The other end of BC bag primary windings connects C terminal sleeve (14) of phase by B bag C phases suspension brackets (20);
There is AB iron clads core (7) in insulation shell (13), be cased with AB bags secondary skeleton (5) on the outside of AB iron clads core (7), AB bags are secondary There is AB bags secondary coil (4) on the outside of skeleton (5), have epoxy backbone (2) of AB bags, AB on the outside of AB bags secondary coil (4) There is AB bags primary winding (1) on the outside of epoxy backbone (2) of bag;
AB bags secondary coil connection AB bag secondary connection inserts (3);
There are BC iron clad cores in insulation shell (13), BC bag secondary skeletons, BC bags secondary skeleton outside are cased with the outside of BC iron clads core There are a BC bag secondary coils, there is epoxy backbone of BC bags on the outside of BC bags secondary coil, outside epoxy backbone of BC bags There are BC bag primary windings side;
BC bags secondary coil (4) connects BC bag secondary connection inserts.
2. the railway outer net cage according to claim 1 that solves becomes the voltage transformer for using voltage transformer shelf depreciation, its It is characterised by:Insulation shell(13)Composition include epoxy resin, silicon powder, polyurethane, mass ratio is:Epoxy resin:Silicon Micro mist:Polyurethane=100:260:5%, wherein 5% is the 5% of epoxy resin quality.
3. the railway outer net cage according to claim 2 that solves becomes the voltage transformer for using voltage transformer shelf depreciation, its It is characterised by:Epoxy resin:Indoor vapour bar CY5526;Silicon powder:400 mesh.
4. the railway outer net cage according to claim 2 that solves becomes the voltage transformer for using voltage transformer shelf depreciation, its It is characterised by:Also mass ratio is 80 curing agent:Indoor vapour bar HY5526.
5. solving the outer net cage of railway becomes the method for using voltage transformer shelf depreciation, it is characterised in that comprises the following steps:
The sub-surface of insulation shell (13) is embedded with gauze screen (6) of metal the step of.
6. the railway outer net cage according to claim 5 that solves becomes the method for using voltage transformer shelf depreciation, its feature exists In comprising the following steps:
There is the step of epoxy backbone (2) of AB bags on the outside of AB bags secondary coil (4);
There is the step of epoxy backbone of BC bags on the outside of BC bags secondary coil.
7. the railway outer net cage according to claim 5 that solves becomes the method for using voltage transformer shelf depreciation, its feature exists In comprising the following steps:A terminal sleeve of phase, terminal sleeve of terminal sleeve of B phases and C phases are set in insulation shell (13) (14);
It is inner in terminal sleeve of A phases in the interior A facies tracts screw rod fuse of insulation shell (13), in B facies tract screw rod fuses End is in terminal sleeve of B phases, the inner step in terminal sleeve (14) of C phases of C facies tract screw rods fuse.
8. the railway outer net cage according to claim 5 that solves becomes the method for using voltage transformer shelf depreciation, its feature exists In comprising the following steps:Insulation shell(13)Composition include epoxy resin, silicon powder, polyurethane, mass ratio is:Asphalt mixtures modified by epoxy resin Fat:Silicon powder:Polyurethane=100:260:5%, wherein 5% is the 5% of epoxy resin quality.
9. the railway outer net cage according to claim 8 that solves becomes the voltage transformer for using voltage transformer shelf depreciation, its It is characterised by:Epoxy resin:Indoor vapour bar CY5526;Silicon powder:400 mesh.
10. the railway outer net cage according to claim 8 that solves becomes the voltage transformer for using voltage transformer shelf depreciation, its It is characterised by:Also mass ratio is 80 curing agent:Indoor vapour bar HY5526.
CN201710340706.6A 2017-05-16 2017-05-16 Solve the outer net cage of railway and become the voltage transformer and method for using voltage transformer shelf depreciation Withdrawn CN107424813A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201710340706.6A CN107424813A (en) 2017-05-16 2017-05-16 Solve the outer net cage of railway and become the voltage transformer and method for using voltage transformer shelf depreciation

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107799290A (en) * 2017-12-04 2018-03-13 大连北方互感器集团有限公司 Voltage transformer low pressure screening arrangement and preparation method thereof

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CN102832036A (en) * 2011-06-15 2012-12-19 大连华亿电力电器有限公司 Three-phase integrated voltage transformer
CN204117823U (en) * 2014-07-24 2015-01-21 大连新安越电力设备有限公司 A kind of ring main unit dedicated potential transformer
CN204204614U (en) * 2014-10-24 2015-03-11 大连第二互感器集团有限公司 A kind of small outdoor voltage transformer
CN204204623U (en) * 2014-10-30 2015-03-11 湖北大二互科技有限公司 A kind of ring main unit current potential threephase potential transformer outwardly
CN204927013U (en) * 2015-08-25 2015-12-30 山东泰开电力电器有限公司 Novel pouring type voltage transformer is insulating device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101343399A (en) * 2008-09-02 2009-01-14 中南大学 Immingled filling material filled polyurethane modified epoxy resin embedding material and preparation method
CN101508825A (en) * 2009-03-30 2009-08-19 汕头市骏码凯撒有限公司 Epoxy resin embedding glue and method for producing the same
CN201796717U (en) * 2010-05-07 2011-04-13 大连第二互感器集团有限公司 Voltage transformer
CN102832036A (en) * 2011-06-15 2012-12-19 大连华亿电力电器有限公司 Three-phase integrated voltage transformer
CN204117823U (en) * 2014-07-24 2015-01-21 大连新安越电力设备有限公司 A kind of ring main unit dedicated potential transformer
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CN204204623U (en) * 2014-10-30 2015-03-11 湖北大二互科技有限公司 A kind of ring main unit current potential threephase potential transformer outwardly
CN204927013U (en) * 2015-08-25 2015-12-30 山东泰开电力电器有限公司 Novel pouring type voltage transformer is insulating device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107799290A (en) * 2017-12-04 2018-03-13 大连北方互感器集团有限公司 Voltage transformer low pressure screening arrangement and preparation method thereof

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