CN107195444A - Dry type auto-transformer - Google Patents
Dry type auto-transformer Download PDFInfo
- Publication number
- CN107195444A CN107195444A CN201710639486.7A CN201710639486A CN107195444A CN 107195444 A CN107195444 A CN 107195444A CN 201710639486 A CN201710639486 A CN 201710639486A CN 107195444 A CN107195444 A CN 107195444A
- Authority
- CN
- China
- Prior art keywords
- coil
- transformer
- dry type
- sectional circular
- tap
- 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
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Classifications
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- 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
-
- 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
- H01F27/085—Cooling by ambient air
-
- 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
- H01F27/2876—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
- H01F27/30—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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
A kind of dry type auto-transformer, using segmented line around cast cylinder mode, is made up of multiple sectional circular cartridge type coil combinations, and main winding tap input voltage is UA, auxiliary winding tap output voltage Ua, sectional circular drum type coil is interior to include first layer coil and second layer coil, and first layer coil and second layer coil tail tail are connected, to increase electric capacitance；Each sectional circular cartridge type coil tube end sets tap, output voltage U respectivelyaSwitch according to requirements between each tap；Cross-over block is set between two adjacent sectional circular drum type coils, and whole winding is integral using poured with epoxy resin solidification.It is an advantage of the invention that auto-transformer uses poured with epoxy resin, compact conformation, volume is relatively small；Increase electrostatic sheild outside coil use segmentation winding structure, first floor coil；Improve the ability of tolerance atmospheric over-voltage and the impact strength of switching overvoltage；Coil inner ring is set and sets air duct between ventilation slot, sectional coil cylinder, and individual capacity can be not limited.
Description
Technical field
The present invention relates to power distribution technical field, and in particular to a kind of dry type auto-transformer.
Background technology
With vigorously implementing for national energy-saving policy, power station auxiliary system carries out a large amount of frequency converter transformations, to reduce machine
Group station service power consumption rate.But, the subsidiary engine frequency converter low voltage ride-through capability of current most of fired power generating units is poor, the not even tool having
Standby low voltage ride-through capability.Occur in that the problem of instantaneous voltage fluctuation causes a large amount of fired power generating unit chasers occurs for power network, due to becoming
Frequency speed control device does not possess low voltage ride-through function, triggers the under-voltage protection of frequency converter, causes frequency converter locking to export, most
Cause accident eventually.
In order to examine the high-low voltage ride-through capability of low voltage frequency converter, it is necessary to be worn to low voltage frequency converter and progress high-low voltage
The more improved low voltage frequency converter of ability is tested, but lacks corresponding detection device.To frequency converter voltage ride-through capability
Checking is, it is necessary to develop a set of voltage dip device, to verify frequency converter ride-through capability in Voltage Drop.
Frequency converter voltage passes through experimental rig by testing transformer, fast incision pass, tunable load, presetting apparatus and ripple
Shape recorder is constituted.Transformer switching voltage can produce overvoltage during due to experiment, and common auto-transformer winding is due to existing
Structured limitation, impedance is relatively low, and impact resistance voltage capability is poor.Fig. 1 show the foundation structure of existing auto-transformer, the
One coil and the second coil use the mode for the mode that is directly connected to, and voltage between layers is larger, and electric distribution capacity is undesirable.General
Auto-transformer voltage regulation limits are general in 5%-105%, it is impossible to meet frequency converter voltage and pass through required voltage regulation model
Enclose 20%-130% requirement.Therefore the testing transformer of design specialized is needed.
The content of the invention
It is an object of the invention to provide a kind of dry type auto-transformer, passed through applied to frequency converter voltage in experiment.This
Invention, around cylinder mode, winding integrated cast, meets wanting for frequency converter voltage acrossing range using special construction, segmented line
Ask.
A kind of dry type auto-transformer, using segmented line around cast cylinder mode, by multiple sectional circular drum type coil groups
Close and constitute, wherein, first layer coil and second layer coil, first layer coil and second layer coil are included in sectional circular drum type coil
Tail tail is connected, and increases electric capacitance；Cross-over block, cross-over block stationary phase are set between two neighboring sectional circular drum type coil
Air channel is set between the relative position of two adjacent sectional circular drum type coils, cushion block, increases the radial radiating of coil.
A kind of above-mentioned dry type auto-transformer, electrostatic sheild is put in two segmented line ring layer peripheral hardwares of transformer head end, is increased
Plus head end coil direct-to-ground capacitance, improve capacitance profile, the ability of intensifier coil impact resistance voltage.
A kind of above-mentioned dry type auto-transformer, ventilation slot is set between the inner ring and iron core of the sectional circular drum type coil,
Air duct is set between sectional circular drum type coil, it is axial and it is radial all form heat dissipation wind channel, strengthen the dry type auto-transformer
Heat dispersion.
A kind of above-mentioned dry type auto-transformer, main winding tap input voltage is UA, it is electric that auxiliary winding tap provides output
Press Ua, output voltage U that auxiliary winding tap a provide different according to the position for connecting specific tapaElectricity is inputted with main winding tap
Press UAProportionate relationship have following five kinds：
Ua=20%UA；
Ua=60%UA；
Ua=90%UA；
Ua=100%UA；
Ua=130%UA。
A kind of above-mentioned dry type auto-transformer, coil uses copper conductor coiling, and the sectional circular drum type coil uses copper
Draw tap in wire coiling, two ends.
A kind of above-mentioned dry type auto-transformer, it is overall integrally to be poured into a mould using epoxide resin vacuum impregnated.
The advantages of the present invention are：
1) transformer adjustable range is big, from 20%UATo 130%UA；Voltage is differential big, from 20%-100%, meets special
The requirement of experiment.
2) coil uses particular section, and adds electrostatic sheild in head end, not only increased head end coil electric electric capacity but also increasing
Coil direct-to-ground capacitance is added, has substantially increased self coupling and become surge voltage tolerance level.
3) pattern is become using self coupling, consumable material is few, and cost is low.Auto-transformer coil volume is reduced, institute's consumption material
Reduce, cost is also low.
4) few high efficiency is lost.Because copper cash and silicon steel sheet consumption are reduced, in same current density and magnetic flux density,
The copper loss and iron loss of auto-transformer are all reduced than two-winding transformer, therefore better results.
5) it is readily transported and installs.Because it is more lightweight than the two-winding transformer of same capacity, size is small, floor space
It is small.
5) limit manufacture capacity of transformer is improved.The limit manufacture capacity of transformer is typically limited by traffic condition
System, in the limitation of identical traffic condition, under identical traffic condition, auto-transformer capacity is than two-winding transformer system
Make larger.
Brief description of the drawings
Fig. 1 is the infrastructure diagram of sectional circular drum type coil in the prior art.
The cylindrical layer winding section of Fig. 2 present invention.
Fig. 3 is the electric capacity equivalent circuit of cylindrical layer winding in the present invention.
Fig. 4 is the infrastructure diagram of sectional circular drum type coil in the present invention.
Fig. 5 is coil ventilation slot of the present invention and air duct schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
The present invention dry type auto-transformer use dry type self coupling, winding using copper conductor, the coiling of coil grading drum type brake,
Fixed between segmentation using cross-over block, winding is integrally poured into a mould using epoxide resin vacuum impregnated, not filled, solid by temperature
Change curve solidified forming.
As shown in Fig. 2 the present invention uses extraordinary segmented line around cast cylinder mode.Winding uses particular section, respectively takes out
Head is derived from segmentation leading-out terminal.Using sectional circular core structure, electric electric capacity can not only be increased, but also it is big to substantially increase tolerance
The ability of gas overvoltage and the impact strength of switching overvoltage.Winding has higher electrical strength and mechanical strength, coil inner ring
Ventilation slot and air duct are provided between subsection cylindrical, with preferable heat dispersion, it is ensured that winding temperature rise is smaller.So, it is single
Platform capacity can be not limited.
A kind of dry type auto-transformer, using segmented line around cast cylinder mode, by multiple structures of sectional circular drum type coil 1
Into.As shown in figure 4, first layer coil 11 and second layer coil 12 are included in sectional circular drum type coil 1, first layer coil 11 and the
The tail tail of two layer line circle 12 is connected, and increases coil electric capacitance；Each leading-out terminal of sectional circular drum type coil 1 sets tap respectively, defeated
Go out voltage tap according to requirements between each tap to switch；Set insulation solid between two adjacent sectional circular drum type coils 1
Determine cushion block.
Further, in the outer setting electrostatic sheild 2 of two sectional circular drum type coils 1 of transformer head end, head end coil is increased
Direct-to-ground capacitance.
Further, as shown in figure 5, setting ventilation slot, adjacent point between the inner ring and iron core of the sectional circular drum type coil 1
Air duct is set between cylindrical section formula coil 1, it is axial and it is radial all form heat dissipation wind channel, strengthen the dry type auto-transformer
Heat dispersion.Air duct between the sectional circular drum type coil 1 by be arranged between adjacent sectional cylindrical layer winding 1 it is multiple absolutely
Edge cushion block is constituted, and multiple cross-over blocks are sequentially spaced, and cushion block plays a part of fixed and insulated in itself, the interval between cushion block
Play air duct.
Further, main winding tap provides input voltage UA, auxiliary winding tap offer output voltage Ua, according to finally drawing
The position of the specific tap gone out is different, the output voltage U that auxiliary winding tap is providedaWith main winding tap input voltage UARatio
Relation has following five kinds：
Ua=20%UA；
Ua=60%UA；
Ua=90%UA；
Ua=100%UA；
Ua=130%UA；
It is combined with load switching switch to use, auto-transformer tapping has been led on load switching switch respectively, is passed through
Switching switch, can be achieved the switching between above-mentioned multiple voltage class.
Main winding voltage can meet 6kV or 10kV, and voltage class is designed by 10kV grades；Rated capacity is calculated by 6kV, amount
Capacity design is 3000kVA-4000kVA, can meet most frequency converter voltages and pass through test requirements document.
Further, the sectional circular drum type coil 1 uses copper conductor coiling, and tap is drawn at two ends.
Further, the dry type auto-transformer is integrally integrally poured into a mould using epoxide resin vacuum impregnated, is not filled with
Material, by temperature curing profile solidified forming.
The electric capacitance of electric the electric capacity distribution gradient, i.e. equipment of decision device tolerance surge voltage to a certain extent
Bigger, the distribution gradient of its surge voltage more tends to be uniform.When coil is impacted, the distribution gradient of surge voltage is not only
It is decided by the electric capacitance of coil, further determines in the electric electric capacity K and electric electric capacity C is arrived along coil head end over the ground in the longitudinal direction of coil
The distribution of end.It is the equivalent circuit of the electric electric capacity of the present invention shown in Fig. 3, as seen from the figure, the longitudinal electrically electric capacity K of the present invention
Electric electric capacity C is evenly distributed over the ground, at head end, and head end direct-to-ground capacitance is added due to being provided with electrostatic sheild 2, work as transformation
When device is impacted, end reduces because of electric capacity increase, pressure drop, and the voltge surge that whole winding is subject to can become to be uniformly distributed, and protects
The insulation of End winding is protected.
As shown in figure 4, setting the loop length of foundation structure as b, geometric capacitance value is Kj, electric capacitance is Kt, interlayer electricity
Press as U, then the energy of layer capacitance is：
∴Kt=Kj
Foundation structure such as Fig. 1 of common sectional circular drum type coil.If the loop length of foundation structure is b '=b, geometry electricity
Capacitance is Kj, electric capacitance is Kp, voltage between layers is U '=U, then the energy of layer capacitance is：
∵Kp=1/3Kj
∴Kj=3Kp
Above-mentioned result of calculation shows, in other conditions under the same conditions, particular section cylindrical layer winding, its electric electric capacity
Value is 3 times of the electric capacitance of common cylindrical layer winding.
The dry type auto-transformer of the present invention with the general transformer with capacity compared with, with simple in construction, materials province,
The advantages of small volume.Especially seem especially economical close to 1 occasion in transformation ratio, this self coupling becomes maximum no-load voltage ratio into 1.3, minimum
For 0.2.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (6)
1. a kind of dry type auto-transformer, using segmented line around cast cylinder mode, by multiple sectional circular cartridge types containing iron core
Coil（1）Combination is constituted, it is characterised in that
Sectional circular drum type coil（1）It is interior to include first layer coil（11）With second layer coil（12）, first layer coil（11）With
Two layer line circles（12）Tail tail is connected, and increases electric capacitance；
Two adjacent sectional circular drum type coils（1）Between multiple cross-over blocks are set, cross-over block fixes adjacent two points
Cylindrical section formula coil（1）Relative position.
2. a kind of dry type auto-transformer as claimed in claim 1, it is characterised in that
In two sectional circular drum type coils of transformer head end（1）Outer setting electrostatic sheild（2）, increase head end coil direct-to-ground capacitance.
3. a kind of dry type auto-transformer as claimed in claim 1, it is characterised in that the sectional circular drum type coil（1）'s
Ventilation slot, adjacent sectional cylindrical layer winding are set between inner ring and iron core（1）Between air duct is set, it is axial and it is radial all formed dissipate
Hot-flow flue, strengthens the heat dispersion of the dry type auto-transformer.
4. a kind of dry type auto-transformer as claimed in claim 1, it is characterised in that main winding tap input voltage is UA, it is secondary
Tapping provides output voltage Ua, output voltage U that auxiliary winding tap provide different according to the position for connecting specific tapaWith
Main winding tap input voltage UAProportionate relationship have following five kinds：
Ua=20%UA；
Ua=60%UA；
Ua=90%UA；
Ua=100%UA；
Ua=130%UA。
5. a kind of dry type auto-transformer as claimed in claim 1, it is characterised in that the sectional circular drum type coil（1）Adopt
Copper conductor coiling is used, tap is drawn at two ends.
6. a kind of dry type auto-transformer as claimed in claim 1, it is characterised in that the dry type auto-transformer is integrally adopted
Integrally poured into a mould with epoxide resin vacuum impregnated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710639486.7A CN107195444A (en) | 2017-07-31 | 2017-07-31 | Dry type auto-transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710639486.7A CN107195444A (en) | 2017-07-31 | 2017-07-31 | Dry type auto-transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107195444A true CN107195444A (en) | 2017-09-22 |
Family
ID=59884167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710639486.7A Pending CN107195444A (en) | 2017-07-31 | 2017-07-31 | Dry type auto-transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107195444A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112117108A (en) * | 2020-09-21 | 2020-12-22 | 桃江凤冠电机有限公司 | Resin-cast dry-type transformer with high-voltage coil structure |
| WO2022061620A1 (en) * | 2020-09-23 | 2022-03-31 | Siemens Gas And Power Gmbh & Co. Kg | Auto-transformer, method for designing auto-transformer and storage medium |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2641908Y (en) * | 2003-03-12 | 2004-09-15 | 成都东方凯奇电气有限责任公司 | Low excitation inrush current, low operation overvoltage phase-shifting transformer |
| CN102364629A (en) * | 2011-09-30 | 2012-02-29 | 山东电力设备有限公司 | Double-U-shaped coil |
| CN203812707U (en) * | 2014-04-17 | 2014-09-03 | 新乡逐鹿实业股份有限公司 | Dry type auto-transformer for motor voltage reduction starting |
| CN204303529U (en) * | 2014-12-31 | 2015-04-29 | 中变集团上海变压器有限公司 | Photovoltaic power generation transformer loop construction |
| CN104934199A (en) * | 2015-07-03 | 2015-09-23 | 江苏容天机电科技有限公司 | Dry-type autotransformer for reduction voltage starting |
| CN205985897U (en) * | 2016-08-29 | 2017-02-22 | 江苏力阳电器制造有限公司 | Intelligence compact combination formula primary substation for wind power generation |
| CN206961661U (en) * | 2017-07-31 | 2018-02-02 | 国网上海市电力公司 | Dry type auto-transformer |
-
2017
- 2017-07-31 CN CN201710639486.7A patent/CN107195444A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2641908Y (en) * | 2003-03-12 | 2004-09-15 | 成都东方凯奇电气有限责任公司 | Low excitation inrush current, low operation overvoltage phase-shifting transformer |
| CN102364629A (en) * | 2011-09-30 | 2012-02-29 | 山东电力设备有限公司 | Double-U-shaped coil |
| CN203812707U (en) * | 2014-04-17 | 2014-09-03 | 新乡逐鹿实业股份有限公司 | Dry type auto-transformer for motor voltage reduction starting |
| CN204303529U (en) * | 2014-12-31 | 2015-04-29 | 中变集团上海变压器有限公司 | Photovoltaic power generation transformer loop construction |
| CN104934199A (en) * | 2015-07-03 | 2015-09-23 | 江苏容天机电科技有限公司 | Dry-type autotransformer for reduction voltage starting |
| CN205985897U (en) * | 2016-08-29 | 2017-02-22 | 江苏力阳电器制造有限公司 | Intelligence compact combination formula primary substation for wind power generation |
| CN206961661U (en) * | 2017-07-31 | 2018-02-02 | 国网上海市电力公司 | Dry type auto-transformer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112117108A (en) * | 2020-09-21 | 2020-12-22 | 桃江凤冠电机有限公司 | Resin-cast dry-type transformer with high-voltage coil structure |
| WO2022061620A1 (en) * | 2020-09-23 | 2022-03-31 | Siemens Gas And Power Gmbh & Co. Kg | Auto-transformer, method for designing auto-transformer and storage medium |
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Legal Events
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170922 |
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| RJ01 | Rejection of invention patent application after publication |