CN108183016A - A kind of novel magnetic screen reactor - Google Patents
A kind of novel magnetic screen reactor Download PDFInfo
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- CN108183016A CN108183016A CN201711387370.5A CN201711387370A CN108183016A CN 108183016 A CN108183016 A CN 108183016A CN 201711387370 A CN201711387370 A CN 201711387370A CN 108183016 A CN108183016 A CN 108183016A
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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
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
-
- 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
-
- 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
- H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
-
- 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
-
- 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
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/323—Insulation between winding turns, between winding layers
-
- 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
- H01F27/327—Encapsulating or impregnating
-
- 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
- H01F27/33—Arrangements for noise damping
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
A kind of novel magnetic screen reactor, including line packet and shielding case, shielding case is placed on the outside of multiturn line packet, and line packet turn-to-turn has heat dissipation air flue, and the shielding case is made of lamination closed assembly.The inner iron core of existing magnetic screen reactor is eliminated, VA characteristic curve is substantially straight line, can limiting short-circuit current.
Description
Technical field
The present invention relates to a kind of reactors, and in particular to a kind of novel magnetic screen reactor.
Background technology
With the rapid development of China's economy and society, city size constantly expands, and urban population increases sharply, in addition people
The continuous improvement of people's living standard, results in increasing rapidly for urban power consumption, especially key city, and situation is especially pronounced.
When city, electricity consumption level reaches a certain level, if still take on the outskirts of a town periphery build substation entered with low-voltage-grade circuit
The mode of city power supply, can not only cause the performance of electric appliance poor, but also the pipe of transmission line of electricity due to power quality is relatively low
Line corridor can also tie up valuable urban underground space resource, make other public utilities（Such as water, telecommunications pipeline）Enter city difficulty.
Moreover, this mode also brings high construction cost and eventually leads to the exacerbation of society's electricity consumption cost burden.
Therefore, after urban development is to certain phase, each big city is mostly taken in down town load intensive area construction
The city indoor substation of high voltage grade, to meet the needs of city load.In recent years, with the increasing of urban power consumption
Add, the construction of city indoor substation is significantly accelerated, and there is trend that is more universal and promoting from now on.Compared to suburb open air
Substation, city indoor substation is due to its special geographical location so that the construction requirements higher of substation, it is increasingly complex,
It is mainly reflected in the following aspects：
（1）Land resource scarcity in city, especially in the city of some developed areas, often an inch of land is an inch of gold, takes over the land for use very
Difficulty, alternative site may only have at one, and area is narrow, this so that being designed and arranged for substation is extremely difficult,
Simultaneously also based on this reason, city becomes the full indoor substation of generally use.
（2）City indoor substation generally comprises a large amount of 10kV outlets, and 10kV short circuit currents are very big, therefore, city family
Interior station need to be added using high-impedance transformer or using middle impedance transformer and limit 10kV sides short circuit electricity by the way of current-limiting reactor
Flow horizontal.Due to the equipment such as main transformer, current-limiting reactor be mounted on it is indoor, the loss of equipment, cost, installation with
It distinguishes larger during outdoor arrangement, additionally needs to consider the challenges such as equipment ventilation and heat, noise, electromagnetic effect.
（3）For the reactor arrangement of various types that current city indoor substation uses, there is the equipment bodies having
Product is big, external magnetic field is big；The various problems such as some weights of equipment are big, noise is big, it is incompatible with indoor installation environment.
（4）The design aspect of indoor substation in city, lectotype selection are general according to State Grid Corporation of China's correlation at present
Equipment performs, and the equipment such as general shunt reactor, current-limiting reactor are applied to family not directed entirely to indoor substation
Interior station is there are some problems because indoor station is to contour size of the unit(s), transport installation, weight, external magnetic field and noise requirement compared with
Outdoor substation higher.
Due to the above problems, the indoor large capacity substation in city is in lectotype selection, design, operation etc. at present
There are still some problems, it would be highly desirable to further research and optimization.Therefore, this subject is intended by investigating extensively, to existing at present
The characteristics of reactor arrangement that the indoor station in city generally uses and its existing limitation are analyzed, and are studied it and are indoors installed
When influence when running to ambient enviroment magnetic field and noise of the arrangement of equipment, transport, the adaptability of installation and equipment, optimize and grind
Hair is suitble to shunt reactor, current-limiting reactor and the current-limiting reactor equipment that city indoor substation uses.
Domestic and international research level
Reactor is one of most important reactive-load compensation equipment of city indoor substation, applies the electricity in the indoor substation of city
Anti- device mainly includes shunt reactor, current-limiting reactor and current-limiting reactor three classes, separately below to these three type reactors
The characteristics of, research and applicable cases are analyzed.
（1）Shunt reactor
At present, the shunt reactor used in the indoor substation of 220kV cities mainly has dry-type iron-core formula and dry-type hollow formula
Two kinds, capacity is larger, generally between 6MVar~10MVar.The reactor of both patterns is equal in practical implementation
There is it is larger the problem of, have and obviously influence on the design of indoor substation, construction, operation etc..
1）Dry-type shunt reactor with magnetic core
Main problem present in Dry-type shunt reactor with magnetic core substation's use indoors is：
a）Weight of equipment is especially big
Dry-type iron-core formula shunt reactor is usually three-phase coenosarc structure, and weight is generally between 17~22 tons.Due to quality too
Greatly, equipment not only increases the Integral Loading in entire distribution building, and equipment position is very limited, and can only be arranged in power transformation
It stands one layer, and is not easy to carry.In addition, it is contemplated that one layer of substation is there are cable installations such as a large amount of conduit lines, tunnels, even
Be arranged in one layer of substation, equipment still face be difficult to carry, the problem of Maintenance and Repair are inconvenient and exit difficulty.
b）Noise of equipment is big, vibration is big
Although State Grid Corporation of China's procurement criteria is to the noise level of the indoor 10kV Dry-type shunt reactor with magnetic core used and shakes
Dynamic limit value has regulation, noise level≤59dB, peak-peak vibration limit value≤100 μm.But due to iron-core reactor body construction
Feature, coil inside must include iron core, and in order to reach certain reactance value, it is desirable that the magnetic resistance of iron core is larger, silicon iron
Piece will have gap, and the noise level of most of shunt reactor at present is caused to generate very big make an uproar considerably beyond standard required value
Sound and vibration, seriously affect running environment.In addition residential block, the serious noise of equipment are often closed in indoor substation site in city
The operations staff of substation and work and the quality of life of neighbouring resident are directly affected with vibration.With Environmental Protection in China requirement
The problem of constantly improve and raising, transformer substation in city noise pollution, urgently solves in better.
c）Equipment price is expensive
Since iron core shunt reactor consumptive material is more, using a large amount of metal material, mainly conductor, silicon steel sheet and insulating materials,
Therefore, it is at high price, it is not economical enough.
2）Dry type hollow shunt reactor
Main problem present in dry type hollow shunt reactor substation's use indoors is：
a）Equipment leakage field is big, and installation dimension is big, and external magnetic field can interfere secondary device signal, makes to close on the fever of steel structure
Dry type hollow shunt reactor is usually phase structure, uses air as magnetic circuit, therefore its ambient magnetic field strength is very big,
Antimagnetic distance is considered during installation, ontology is larger in addition, thus hold facility area and space are larger.
The usual compact arrangement of equipment in indoor station, various primary equipments, secondary device, cable, metal parts, the steel in building
Structure etc. is crisscross.Dry type hollow shunt reactor separates arrangement using three-phase, after considering antimagnetic range, the face that needs
Product and space are very big, cause the difficulty of Substation Design and arrangement.Meanwhile if not using shielding measure, external magnetic field pair
Secondary device constitutes serious interference；If reactor is interior using shielding measure, external magnetic field can generate very gauze screen
Serious heating effect.According to the practical experience that national indoor substation is run, the fever of the gauze screen in reactor compared with
Seriously, the normal operation and safety of substation are directly affected.
b）Loss is big
The running wastage of dry type hollow shunt reactor is relatively large, and equipment operation is not economical enough.
In view of above two pattern shunt reactor there is it is serious the problem of, therefore, city indoor substation
Construction be badly in need of Optimal improvements or the new shunt reactor equipment for more adapting to use in city indoor substation of research and development.
（2）Current-limiting reactor
At present, the current-limiting reactor used in the indoor substation of city is mainly dry-type air-core reactor, effect be in order to
Limit main transformer low-pressure side short circuit current.Current-limiting reactor rated current is generally 2500~4000A, and percentage reactance generally takes
8 ﹪ or 10 ﹪.
There is also larger in practical implementation to ask for current-limiting reactor equipment used by indoor substation at present
Topic, having on the design of indoor substation, construction, operation etc. obviously influences.
Dry type hollow current-limiting reactor capacity is generally also larger, similar with dry type hollow shunt reactor, dry-type hollow limit
Flowing reactor, there is also the defects of leakage field is big, installation dimension is big, relatively strong, loss is big to secondary device signal interference.Therefore, city
The current limliting electricity for more adapting to use in city indoor substation of Optimal improvements or research and development newly is also badly in need of in the construction of city's indoor substation
Anti- device equipment.
（3）Current-limiting reactor in parallel capacitor device
At present, the parallel capacitor device used in the indoor station in city is generally frame-type, the displacement volume of capacitor group
Between 6MVar~10MVar, the percentage reactance of current-limiting reactor generally takes 5 ﹪ or 12 ﹪ in frame type capacitive device device.
Since it is indoors used, and be arranged close to control room and relay bungalow, in order to reduce its electromagnetic interference to secondary device,
Current-limiting reactor generally uses dry-type iron-core reactor, although capacity is smaller, equally exists that weight of equipment is relatively large, makes an uproar
The problem of sound is larger and expensive.
Main problem existing for reactor at present
（1）Shunt reactor
The main problem that the Dry-type shunt reactor with magnetic core used at present is indoors installed is：
a）Three-phase integrated structure, weight is big, generally at 10~20 tons, is not advantageously mounted at two layers, installation and repairing is not easy to carry；
b）During operation, vibration is also easy to produce, noise is big；
c）It consumes silicon iron plate and electromagnetic wire is more, it is expensive.
（2）Current-limiting reactor
The dry type hollow current-limiting reactor used at present is mounted on the bottom center in distribution building, is primarily present following problem：
a）It is larger that floor space is installed；
b）External magnetic field is big, easily makes neighbouring steel structure fever, easily interferes secondary device signal.
（3）Current-limiting reactor
At present, the current-limiting reactor that indoors station uses, mainly dry-type iron-core reactor although its capacity is smaller, are still deposited
In improvable problem, such as：
a）Three-phase integrated structure, installation weight is relatively large, generally at 1~2 ton；
b）Price is relatively expensive；
c）Larger noise is generated sometimes.
According to above analysis, the shunt reactor used in the indoor substation of city at present, current-limiting reactor and string
Connection reactor there are problems that the defects of certain and.
Common shielding techniques are all to install high magnetic conduction shielding cylinder inside and outside dry-type air-core reactor line packet to realize to subtract
The purpose of small leakage field.Line pack arrangement is identical with conventional dry reactor, is entwined, is adopted by small bore (2~Φ of Φ 4) aluminum conductor
It is impregnated with epoxy resin and is encapsulated without latitude glass filament bundle, turn-to-turn insulation material is polyamide film and epoxy resin.Inside and outside screen
It is to be encapsulated by lamination closed assembly into drum type brake using the material and technique identical with line packet, end encapsulating thickness is shown to cover cover
Work thickens.
Mainly there are following several classes in the shunt reactor that China produces and uses：
（1）Half heart shunt reactor of dry type hollow shunt reactor and dry type
（2）Oil immersed type shunt reactor
（3）Dry-type shunt reactor with magnetic core
（1）Half heart shunt reactor of dry type hollow shunt reactor and dry type
The structure of dry type hollow shunt reactor is to be made up of multiple concentric line packets upper and lower starframe parallel connection, and line packet uses aluminium
Twisted wire is bonded by the use of epoxy resin as insulation coiling, and reactor does not have iron core.Dry Type Half-iron-core Reactor and dry-type hollow electricity
The main distinction in anti-device structure is to be equipped with inner iron core in the parallel wire packet of reactor.Air-core shunt reactor all passes through
Air forms the magnetic circuit of reactor.Half core device has iron core to form internal magnetic circuit in reactor, and the outside of reactor is by sky
Gas is as magnetic circuit.
Both reactors are mainly characterized by：Structure is simpler, oil-free, and the diverging of reactor external magnetic field is larger.
Dry-type hollow and half heart shunt reactor of dry type are phase structure, and weight is lighter, but outside its reactor
Magnetic circuit is air, therefore there is some problems during use in the indoor substation of city, and mainly performance is as follows：
（1）Leakage field is big, and installation dimension is big
Dry type hollow shunt reactor is usually phase structure, since dry-type air-core reactor uses air as magnetic circuit,
Its ambient magnetic field strength is very big.Antimagnetic distance is considered during installation, ontology is larger in addition, thus hold facility area and space compared with
Greatly, substation's difficult arrangement is caused, increases distribution building volume.
Due to down town land resource scarcity, expropriation of land is extremely difficult, and substation's floor space is narrow, usual equipment arrangement
Space it is very limited and crowded, various primary equipments, secondary device, cable, metal parts, steel construction etc. is in length and breadth in building
Staggeredly.Substation uses dry-type hollow or half heart shunt reactor, if not using shielding measure, secondary device is constituted seriously
Interference；If reactor is interior using shielding measure, reactor external magnetic field can generate very serious heating effect to gauze screen.
According to the practical experience that national indoor substation is run, the fever of inner shield net is very serious between reactor, directly affects change
The normal operation and safety in power station.
（2）Loss is big
Dry-type air-core reactor loss is relatively large, and equipment operation is not economical enough.
Case above shows that dry-type hollow or half heart shunt reactor are not suitable for indoors installing, in the indoor power transformation in city
The adaptability stood is very poor, has the tendency that gradually being eliminated.
（2）Oil immersed type shunt reactor
The structure of oil immersed type shunt reactor is similar with oil-immersed transformer, has winding coil and forms the iron core structure of complete magnetic circuit
Into using transformer oil as major insulation, therefore, there are one fuel tanks for outside.
This reactor is complex, and construction store doses is big, containing a large amount of insulating oils, external leakage field very little.
Oil immersed type shunt reactor volume is larger, and weight is also very big, containing a large amount of insulating oil, is used at the indoor station in city
When need to be mounted on independent reactor room, and to have accident oil extraction pond and other fireproofing installations.Reactor takes up space very greatly,
It must cannot be arranged in pairs or groups construction with other power distribution stations in substation bottom arrangement, the adaptation that this kind of and anti-substation indoors uses
Property is poor, therefore is not used substantially in the later substation of building time.
（3）Dry-type shunt reactor with magnetic core
The structure of dry-type iron-core reactor is made of coil and iron core, and the insulation of coil is made of using epoxy resin iron core
Complete magnetic circuit.
This reactor consumption coil copper wire, iron core and insulating materials are more, oil-free, external leakage field very little.
Dry-type shunt reactor with magnetic core due to having complete closed core magnetic circuit, the leakage field around reactor is very
It is small, at the indoor station in city in use, the secondary singal of indoor substation will not be interfered, the steel structure in substation's building will not be made
Fever.In addition, its insulation using epoxy resin, does not use insulating oil, when installation and operation, is not required to set emergency oil pond and especially right
It uses fireproofing installation.The advantages of due to more than, makes this style of shunt reactor certain using existing at the indoor station in city
Advantage, therefore, the shunt reactor that the indoor station in the city of building time a little later uses generally selects dry-type iron-core electricity in parallel
Anti- device.But after the use for passing through a period of time, it the problem of also gradually display.It is asked existing for Dry-type shunt reactor with magnetic core
Topic is：
（1）Weight of equipment is especially big
Dry-type shunt reactor with magnetic core is usually three-phase coenosarc type, and weight is generally between 11~21 tons.Since quality is too big, if
Standby position is very limited, and can only be arranged in one layer of substation, and be not easy to carry.Equipment increases the entirety in entire distribution building
Load, in addition, it is contemplated that one layer of substation is there are cable installations such as a large amount of conduit lines and tunnels, even being arranged in substation
One layer, equipment still face be difficult to carry, Maintenance and Repair and the problem of exit.
（2）Noise of equipment is big, vibration is big
Although standard has provision for this, noise level requirements are less than or equal to 56dB, and vibration limit value is less than or equal to 100 μm.But due to
Iron-core reactor body construction must include iron core, and in order to reach certain reactance value, the magnetic resistance of iron core requires larger, silicon iron plate
There is gap, lead to part at present and its noise level is resisted to generate larger noise and vibration, seriously considerably beyond standard requirement
Influence running environment.Since residential block, the serious vibration of equipment and the direct shadow of noise are often closed in city indoor substation site
Work and the quality of life of work of transformer substation personnel and neighbouring resident are rung.As the constantly improve of Environmental Protection in China requirement is with carrying
The problem of height, transformer substation in city noise pollution, urgently solves in better.
（3）Equipment price is expensive
Since core type shunt reactor consumptive material is more, a large amount of metal material, mainly conductor, silicon steel sheet and insulation material are used
Material, therefore its is at high price, it is not economical enough.
The basic principle of magnetic screen shunt reactor is that high magnetic conduction shielding cylinder is installed inside and outside dry-type air-core reactor line packet
To realize the purpose for reducing leakage field.Line pack arrangement is identical with conventional dry reactor, is twined by small bore (2~Φ of Φ 4) aluminum conductor
Around into being impregnated using epoxy resin and encapsulated without latitude glass filament bundle, turn-to-turn insulation material is polyamide film and asphalt mixtures modified by epoxy resin
Fat.Inside and outside shielding case is to be encapsulated by lamination closed assembly into drum type brake using the material and technique identical with line packet, end
Encapsulating thickness significantly thickens.The basic structure schematic diagram of its line packet and shielding case is as shown in Figs. 1-2.The reactance utensil of this structure
There are following features：
（1）Due to there is the presence of iron core, the magnetic resistance of reactor is smaller, for given reactance value, the number of turn phase needed for reactor
To less, thus reactor body small volume；
（2）Due to the high magnetic conductivity of iron core, magnetic flux largely forms closed circuit by iron core, can greatly reduce in peripheral air
Leakage field, thus equipment room arrangement size can be reduced, while greatly reduce the interference to secondary singal.
Based on above-mentioned two aspects reason, compared with conventional dry air reactor, magnetic screen reactor floor space can be substantially
It reduces.
State Grid Corporation of China's common apparatus（Version in 2014）In, for the main transformer that capacity in 220kV substations is 240MVA
Resistance requirements be middle impedance transformer, model SFSZ-240000/220, impedance voltage：U1-2=14%, U1-3=35%, U2-
3=20%.Common engineering requires 10kV sides short circuit current being restricted to 25kA, need to add 10kV current-limiting reactors in main transformer 10kV sides
Device, due to being limited by 10kV switching currents, ordinary circumstance, the rated current selected as 4000A of reactor, impedance 10%.
Since common magnetic screen iron-core reactor can generate magnetic circuit saturation in short circuit, decline impedance, lose current limliting
Effect, therefore, is used in previous engineering using dry-type air-core reactor as current-limiting reactor, typical model
XKDK-10-4000-10, three compatible amounts of the current-limiting reactor are that capacity is larger, and dry-type air-core reactor is using air as magnetic
Therefore, there be following features on road：
（1）Phase structure；
（2）Reactor body size is big；
（3）Its external magnetic field is very strong, is had the disadvantage that in practical engineering application：
（1）Take up an area during installation big.One side reactor body size is big, between another aspect single-phase reactor and reactor with week
Fence is both needed to consider antimagnetic distance, and therefore, installation is taken up an area very big.
（2）Make steel structure fever around, interfere secondary singal.Since the external magnetic field of dry-type air-core reactor is very strong, and to
Surrounding space diverging is far, in previous engineering, generates heat in steel structure and has embodiment or even reactance to the interference of secondary singal
When device is run, the steel fence temperature for meeting antimagnetic distance is still very high.
Its external magnetic field of dry-type air-core reactor is very big, and very big problem is not present when installing outdoors, and indoors substation is pacified
During dress, installation site is between main transformer and 10kV switchgears, the central area in indoor substation, needs during design
Think better of following two problems：
（1）The interference that reactor external magnetic field generates secondary device around；
（2）Reactor external magnetic field makes steel structure fever around.
220kV cities indoor substation is located at down town, in order to save occupation of land and save construction area, substation equipment
Arrangement closely, is generally arranged using two or more layers.Current-limiting reactor requires generally arrange due to its technological process
In substation's bottom center, top will generally arrange relay bungalow etc., and secondary device is difficult to avoid.In order to make hollow limit
The external magnetic field for flowing reactor does not generate interference to secondary singal, uses sometimes in the surrounding wall and floor of current-limiting reactor room
Gauze screen is added to shield its external magnetic field.If smaller between reactor, gauze screen is nearer from reactor, and external magnetic field easily makes shielding
Net fever, therefore, reactor room is forced to increase.
From the point of view of case above, dry type hollow current-limiting reactor is apparently not a kind of electrical to be set suitable for what is indoors installed
It is standby.
For disadvantage mentioned above, when open air station is designed, its shortcoming was overcome using following measure in the past：
（1）A reactor high position is arranged, cancels fence；
（2）When arranging dry-type air-core reactor, the room of secondary device is arranged far from relay bungalow etc. as possible.For open air station
Since its occupation of land is larger, equipment arrangement is more disperseed, these measures are feasible.
And for city indoor substation, since its design feature is：
（1）Equipment is arranged in indoor；
（2）Equipment arrangement is very compact, closer to the distance.This causes the shortcomings that dry-type air-core reactor to become serious many, especially
It is to overcome the fever of steel structure, secondary device signal prevented to be interfered become extremely difficult, it is clear that dry-type air-core reactor is not one
Kind is suitable for the indoor equipment used.
The principle of shielding techniques is that high magnetic conduction shielding cylinder is installed inside and outside dry-type air-core reactor line packet to realize significantly
Reduce leakage field, reduce surrounding magnetic field.But although magnetic screen reactor magnetic circuit with the presence of air, also iron core is deposited
, when circuit occur short circuit when, core portion can also generate magnetic circuit saturation, generate the VA characteristic curve of current-limiting reactor
Inflection point reduces its metering function.
Invention content
To solve the above problems, the present invention provides a kind of novel magnetic screen reactor.
Technical scheme of the present invention is specially：
A kind of novel magnetic screen reactor：Including line packet and shielding case, shielding case is placed on the outside of multiturn line packet, and line packet turn-to-turn is deposited
In heat dissipation air flue, the shielding case is made of lamination closed assembly.
Further：Line packet is entwined by small section lead.
Further：The line packet conducting wire is aluminum steel.
Further：The line packet cross-sectional sizes are Φ 2 to Φ 4.
Further：The line packet is encapsulated using epoxy resin dipping without latitude glass filament bundle.
Further：The line packet turn-to-turn heat dissipation air flue fill insulant.
Further：The insulating materials is polyamide film and epoxy resin.
Further：The shielding case is drum type brake.
Further：Shielding case is encapsulated with line packet using identical material and technique.
Further：Increasing shielding case section reduces shielding case magnetic flux density, when so that the reactor is passed through short circuit current, makes electricity
Saturation point 1.8T is not achieved in anti-device.
Relative to the prior art, technique effect of the invention is；
（1）The inner iron core of existing magnetic screen reactor is eliminated, VA characteristic curve is substantially straight line, can limit short-circuit electricity
Stream.
（2）Also existing iron core, ensure that the magnetic resistance of reactor is smaller in external shield, for given reactance value, electricity
The number of turn needed for anti-device is relatively fewer, thus reactor body small volume.
（3）Due to the high magnetic conductivity of external shield iron core, magnetic flux largely forms closed circuit by iron core, can subtract significantly
Leakage field in few peripheral air, thus equipment room arrangement size can be reduced, while greatly reduce the interference to secondary singal.
（4）Novel magnetic screen reactor is light-weight compared with dry-type iron-core reactor, noise is low, cheap, meanwhile, outer magnetic
Field is small, does not make steel structure fever around, does not interfere secondary device signal, is more suitable for substation's use indoors.
Description of the drawings
Fig. 1 is existing magnetic screen reactor schematic diagram 1.
Fig. 2 is existing magnetic screen reactor schematic diagram 2.
Fig. 3 is magnetic screen reactor schematic diagram 1 of the present invention.
Fig. 4 is magnetic screen reactor schematic diagram 2 of the present invention.
Fig. 5 is magnetic screen reactor outline drawing 1 of the present invention.
Fig. 6 is magnetic screen reactor outline drawing 2 of the present invention.
Fig. 7 is reactor external magnetic field measurement model schematic diagram.
Fig. 8 is magnetic screen reactor volt-ampere performance diagram of the present invention.
Fig. 9 is magnetic screen reactor floor plan of the present invention.
Figure 10 is dry-type air-core reactor floor plan.
Wherein external iron core 1, line packet 2, inner iron core 3, starframe 4, heat dissipation air flue 5.
Specific embodiment
As shown in Figure 3-4, shielding techniques are that high magnetic conduction shielding cylinder is all installed outside dry-type air-core reactor line packet with reality
Now reduce the purpose of leakage field.Line pack arrangement is identical with conventional dry reactor, by the winding of small bore (2~Φ of Φ 4) aluminum conductor
Into being impregnated using epoxy resin and encapsulated without latitude glass filament bundle, turn-to-turn insulation material is polyamide film and epoxy resin.Outside
Shielding case is to be encapsulated by lamination closed assembly into drum type brake using the material and technique identical with line packet, end encapsulating thickness
Significantly thicken.
Increasing core section reduces iron core magnetic flux density design value, when so that the reactor is passed through short circuit current, it is not achieved
Saturation point 1.8T.
（1）Cancel the iron core in general magnetic screen reactor line packet.
Cancelling inner iron core causes the magnetic conductance of magnetic screen reactor magnetic circuit to reduce, and the number of turn of reactor winding increases, thus electricity
Anti- body product is increased, and has the presence of external iron core, external magnetic field still maintains very little, and the small characteristic of external magnetic field is still deposited
.
（2）The section of the external iron core of appropriate increase magnetic screen reactor
Iron-core reactor is since iron core is to be closed, so when short circuit occurs, iron core can generate magnetic saturation phenomenon, and C-V characteristic is bent
Line generates inflection point, and reactance value can drastically decline, and limitation short-circuit capacity greatly weakens, and metering function is not achieved.
Dry-type air-core reactor, magnetic circuit are almost air, and VA characteristic curve is straight line, its reactance when short-circuit
It is worth constant, there is good metering function.
Magnetic screen reactor has iron core as magnetic circuit, although its iron core is not closed, cannot exclude magnetic circuit saturation can
Can, reactance value may be reduced when passing through short circuit current.In order to produce the magnetic screen reactance that VA characteristic curve is straight line
Device is intended reducing iron core magnetic flux density design value by increasing core section, when so that the reactor is passed through short circuit current, it is not achieved
Saturation point 1.8T, and there are adequate allowance, such reactor has metering function.
（1）Reduction reactor external magnetic field-using shielding techniques
Since the magnetic line of force of air reactor is diverging, so leakage field is very big, range is very wide, although the magnetic line of force is met in air
To magnetic resistance be the same, longer from its more remote magnetic line of force, resistance can be amid a sharp increase, but it is so fast not decay.Current limliting electricity
Anti- device if installation indoors, can be to the secondary of the sensitive electrical equipment of surrounding or precision if not doing shielding
Equipment generates interference, does shielded layer if in surrounding above and below the room of installation current-limiting reactor, the metal knot used in shield
Structure can also be influenced by leakage field and be generated heat, and in addition have many bar constructions in house, reactor, which is indoors installed, can lead to surrounding
Bar construction fever.So antimagnetic required distance horizontal direction of air reactor：Alternate is at least 1.7D（D is straight for coil
Diameter）, vertical direction：There should not be coarse metal frame in away from the reactor center 1.1D and 0.5D of upper and lower starframe end face
In the presence of.In Practical Project in the case where meeting 1.1D distances, for the steel fence of surrounding when reactor uses, temperature is still
It is very high, also to amplify this distance at the indoor station in city.
Magnetic screen reactor is the characteristic for being far longer than air using the magnetic permeability of iron core, and part changes the path of magnetic flux,
So as to reduce the aerial divergent state of magnetic flux.Its magnetic flux path is：Sky inside inner iron core and fraction reactor body
Air-lower end air-inner iron core other than gas and conducting wire-upper end air-external iron core and fraction outmost surface and
Air and conducting wire inside fraction reactor body.It can be seen that suitably choosing the size of inner iron core and external iron core, can make
Most magnetic fluxs are passed through from iron core, so as to greatly reduce the leakage field outside reactor.Horizontal direction can be with during installation
Leakage field isolation distance is not considered, it is main to consider electrical distance, vertical direction：Away from reactor center 1.1D and upper and lower starframe
The 0.5D distances of end face are interior should not be with the presence of coarse metal frame.
（2）C-V characteristic is kept to make it away from magnetic density saturation point for linear-reduction iron core magnetic density
C-V characteristic：Iron-core reactor due to iron core be closed thus occur short circuit when iron core can generate magnetic saturation phenomenon, electricity
Anti- value can drastically decline, and anti-short circuit capability greatly weakens, and be not achieved the effect of current limliting, and then there are one to turn for VA characteristic curve
Point.Dry-type air-core reactor, it does not have iron core, its magnetic circuit is almost air entirely, so C-V characteristic is linear.Magnetic screen
Reactor has a possibility that iron core is just not excluded for saturation, the possibility that reactance value changes under very big short circuit current, though this point than
Not upper plain hollow reactor, but iron core can be made far from saturation point by the way that the design value of magnetic flux density is reduced method
1.8T, by taking this engineering as an example：The rated current of current-limiting reactor is 4000A, and the short circuit current that need to be resistant to is 25kA, short circuit current
6.25 times of rated current, highest flux density when we designing by reactor normal operation control in 0.2T hereinafter, in this way,
9 times when the flux density of its saturation point is up（1.8/0.2）, so, its iron core when the electric current of 25kA flows through reactor
Flux density is 0.2T × 6.25=1.25T, and the saturation point 1.8T of separate iron core, iron core will not generate magnetic saturation phenomenon, reactance
The reduction of device impedance is not more than the 3% of its rated value.In addition, in order to which magnetic screen current-limiting reactor is made to have better volt-ampere spy
Property, my the magnetic screen current-limiting reactor of company's exploitation is different from the magnetic screen reactor that we are usually done.Our magnetic in the past
Shielding reactor has inside and outside two layers of iron core.For current-limiting reactor, we eliminate inner iron core, only remain external iron core.
Without inner iron core, magnetic flux path is：Air and conducting wire-upper end air-external iron core inside reactor body and small
The air and conducting wire inside air-lower end air-reactor body other than the outmost surface of part.Without inner iron core its
Air reluctance increases, and reduces the possibility of saturation.But due to there is the presence of external iron core that can greatly reduce outside reactor
Leakage field.If under normal circumstances using magnetic screen reactor, the C-V characteristic of reactor substantially with plain hollow reactance
Device is identical.
Specific embodiment 1：
Rated voltage 10kV, rated current 4000A, the magnetic screen reactor that impedance is 10%.It analyzes its characteristic and uses in the past
Dry-type air-core reactor is compared analysis in the applicable cases of city indoor substation.The model of embodiment 1 is as follows：
XKDKP-10-4000-10
Wherein：XK-current-limiting reactor
D-single-phase
K-dry-type hollow
P-band magnetic screen
10（First）- impedance 10%
4000-allow through maximum rated current 4000A
10（Second）- system nominal voltage 10kV
The environmental condition that equipment uses
1 conditions for equipment use condition of table
Equipment basic fundamental parameter
2 equipment basic fundamental parameter of table
The model of embodiment 1：XKDKP-10-4000-10, outline drawing, external magnetic field distribution and the C-V characteristic situation of product are such as
Under：
The shape of magnetic screen current-limiting reactor is as seen in figs. 5-6
The magnetic leakage measurement data of magnetic screen current-limiting reactor
The external magnetic field of magnetic screen current-limiting reactor is measured, measurement model is as shown in Figure 7.Measurement data is shown in Table 1.
3 magnetic screen current-limiting reactor magnetic leakage measurement data of table
3 magnetic screen current-limiting reactor magnetic leakage measurement data of continued
The C-V characteristic of magnetic screen current-limiting reactor
To study the C-V characteristic of magnetic screen current-limiting reactor, to voltage U, electricity of the magnetic screen current-limiting reactor under different electric currents
It is anti-（Ohm）It is measured, measurement data is shown in Table 2, and VA characteristic curve is as shown in Figure 8.
4 XKDKP-10-4000-10 magnetic screen current-limiting reactor C-V characteristic tables of data of table
The fitting arrangement of magnetic screen current-limiting reactor
It calculates and proposes by design, the installation magnetic clearance of magnetic screen current-limiting reactor is as follows：
a）The lower end of reactor winding should be not less than reactor outer diameter with minimum range of the upper end away from building top surface from the ground
1/2；
b）Reactor center should be not less than 1.5 times of reactor outer diameter with the minimum range of surrounding fence or other objects；
c）Minimum centers-distance between the reactor that three-phase is horizontally mounted is from 1.1 times of no less than reactor outer diameter.
According to the outline drawing of XKDKP-10-4000-10 magnetic screen current-limiting reactors and the clearance requirement of installation magnetic, complete
Its layout drawing is as shown in Figure 9.
Dry type hollow current-limiting reactor fitting arrangement
It calculates and proposes by design, the installation magnetic clearance of dry current limiting reactor is as follows：
a）The lower end of reactor winding should be not less than reactor outer diameter with minimum range of the upper end away from building top surface from the ground
1/2；
b）Reactor center should be not less than 1.7 times of reactor outer diameter with the minimum range of surrounding fence or other objects；
c）Minimum centers-distance between the reactor that three-phase is horizontally mounted is from 1.5 times of no less than reactor outer diameter.
It is required according to the outline drawing of XKGKL-10-4000-10W dry type hollow current-limiting reactors and installation magnetic clearance,
And magnetic-field diffusion is thought of as, add gauze screen at enclosure wall center, suitably increase room-sized, complete its layout drawing such as Figure 10 institutes
Show.
Analysis to the fever of steel structure around
According to magnetic screen current-limiting reactor leakage field analogue data table it is found that when apart from 1300~1500mm of reactor outer, electricity
The power frequency magnetic field intensity of anti-device just drops to 2.0mT and hereinafter, during installation, the outer of reactor there are 1800mm space,
Therefore, the situation that magnetic screen current-limiting reactor is generated heat at the indoor stations of 220kV using steel structure around will not generating.
Analysis to secondary singal interference
According to magnetic screen current-limiting reactor leakage field analogue data table it is found that when apart from 1700~1800mm of reactor outer, electricity
The power frequency magnetic field intensity of anti-device just drops to 1.2mT and following.
According to DL/T 5149-2001《220~500kV computer monitoring system of transformer substation designing technique regulations》5.5.13：
Mounted on the small indoor wall of relay and the network equipment, GB/T 17626-4-8 should be met to power frequency electromagnetic field vulnerability to jamming
（It should be GB/T 17626.8 or IEC61000-4.8 in fact）4 grades.Therefore, the secondary device installed in substation is to power frequency electric
Magnetic field vulnerability to jamming should meet 4 grades.
According to GB/T 17626.8《EMC test and the experiment of measuring technique power frequency magnetic field noise immunity》5th chapter is tested
The regulation of grade, 4 grades continue magnetic field 30A/m, 1s~3s short-term tests 300A/m to stablize.The specification text it further provides that：Experiment
Magnetic field intensity is represented with A/m in grade, and the magnetic induction intensity that 1A/m is equivalent to free space is 1.26 μ T.By this conversion relation, 4
Grade interference continues 37.8 μ T, 1s~3s short-term test of magnetic field, 378 μ T to stablize.
Again by DL/T 5149-2001《220~500kV computer monitoring system of transformer substation designing technique regulations》Provision is said
In bright 9.1.2：" ... the shield effectiveness of relay cell should be between 30~70dB, and general concrete structure is with regard to reachable
Shielding to 30dB is horizontal ... ", it at least can be according to the shield effectiveness of 30dB consideration relays cell.30dB is approximately equivalent to
31.623 times.
To sum up each specification and test code requirement, consider reactor power frequency magnetic field to neighbouring cell（By general concrete wall,
Shield effectiveness 30dB）Monitoring protection equipment interference, need after meeting into room stabilizing magnetic field no more than 37.8 μ T i.e. across small
Intensity before the wall of room is not more than 378 for 37.8 × 31.623=1192 μ T ≈ 1.2mT or into short-term test magnetic field behind room
μ T are 37.8 × 31.623=1192 μ T ≈ 1.2mT that is, across the intensity before cell wall.
It at this time should be according to reactor specific test result（Distance-power frequency stablizes magnetic induction intensity curve）, can correspond to and find
Meet the distance at corresponding field strength value, as minimal distance requirement of the reactor away from secondary device.
From magnetic screen current-limiting reactor（XKDKP-10-4000-10）External magnetic field data are it is found that when leaving reactor outer water
When flat 1.5~1.6m of distance, 1.7~1.8m of vertical range, magnetic induction intensity is less than 1.2mT.Above distance should in Practical Project
It need not take measures meet in, therefore, use will not be to two in 220kV indoor substations for magnetic screen current-limiting reactor
Secondary device signal generates interference.
The I-V Characteristic Analysis of magnetic screen current-limiting reactor
In order to obtain preferable C-V characteristic, the magnetic screen current-limiting reactor of development takes following two measures：
1）Cancel the inner iron core of magnetic screen reactor；
2）Increase the section of magnetic screen reactor external iron core, decline its flux density, short circuit current by when it is unsaturated.
From C-V characteristic tables of data and the magnetic screen current-limiting reactor VA characteristic curve of magnetic screen current-limiting reactor it is found that
For magnetic screen reactor in normal operation when short circuit current maximum value is reached, reactance value drops to 0.144 by 0.145 Ω
Ω, fall are 0.7 ﹪, and when another its passes through short circuit current, VA characteristic curve is straight line, and above-mentioned two measures obtain
Good effect.
It will be apparent from the above that magnetic screen current-limiting reactor fully meets the technical characteristic of current-limiting reactor.
The feasibility and Adaptability Analysis of magnetic screen current-limiting reactor indoors application in substations
Feasibility analysis
Magnetic screen reactor is used as current-limiting reactor, and can critical issue be to produce C-V characteristic as linear product.
From above analysis, it is known that our hospital holds the magnetic screen current-limiting reactor of electrical R ＆ D Cooperation with closing with good
C-V characteristic, it is feasible to be used as current-limiting reactor.
Adaptability Analysis
To study the adaptability of magnetic screen current-limiting reactor, magnetic screen current-limiting reactor and dry type hollow current-limiting reactor are carried out
Comparative analysis, concrete analysis are as follows：
（1）Magnetic screen reactor external magnetic field very little there is no interference secondary device and causes the problem of around steel structure generates heat, dry type
Air reactor external magnetic field is very big, can interfere secondary device, while will also result in steel structure fever around；
（2）Indoor station magnetic screen reactor room arrangement installation dimension is 8.4 × 3.6m, as shown in Figure 9；Dry-type air-core reactor
Room arrangement installation dimension is 10.8 × 4.4m, and as shown in Figure 10, therefore, magnetic screen reactor can significantly save floor occupying area.
（3）The price of magnetic screen current-limiting reactor is about 1.5 times of dry type hollow current-limiting reactor.
In conclusion magnetic screen current-limiting reactor can overcome the significant deficiency of dry type hollow current-limiting reactor equipment, can show
Work saves floor occupying area, and price is slightly higher, and it is suitable that magnetic screen current-limiting reactor, which is indoors stood and used,.
Dry-type air-core reactor in current-limiting reactor indoors substation as in use, its external magnetic field is very big, causing
Surrounding steel structure generates heat, and can interfere secondary device signal, be the equipment of outdoor substation, is not suitable with indoor substation use.
Magnetic screen current-limiting reactor meets the requirement of current-limiting reactor C-V characteristic, in addition, its external magnetic field is with respect to dry type sky
Core device greatly reduces, and indoors use will not cause steel structure fever around and interference secondary device signal in substation, be
A kind of novel indoor substation equipment, can use and promote in 220kV substations.
The above is only the preferred embodiment of the present invention, it is noted that for those skilled in the art,
Under the premise of not departing from general idea of the present invention, several changes and improvements can also be made, these should also be considered as the guarantor of the present invention
Protect range.
Claims (10)
1. a kind of novel magnetic screen reactor, it is characterised in that：Including line packet and shielding case, shielding case is placed on outside multiturn line packet
There is heat dissipation air flue in side, line packet turn-to-turn, the shielding case is made of lamination closed assembly.
2. a kind of novel magnetic screen reactor as described in claim 1, it is characterised in that：Line packet by small section lead wind and
Into.
3. a kind of novel magnetic screen reactor as claimed in claim 2, it is characterised in that：The line packet conducting wire is aluminum steel.
4. a kind of novel magnetic screen reactor as claimed in claim 2, it is characterised in that：The line packet cross-sectional sizes are Φ 2
To Φ 4.
5. a kind of novel magnetic screen reactor as described in claim 1, it is characterised in that：The line packet is soaked using epoxy resin
Stain is encapsulated without latitude glass filament bundle.
6. a kind of novel magnetic screen reactor as described in claim 1, it is characterised in that：The line packet turn-to-turn heat dissipation air flue is filled out
Fill insulating materials.
7. a kind of novel magnetic screen reactor as claimed in claim 6, it is characterised in that：The insulating materials is thin for polyamide
Film and epoxy resin.
8. a kind of novel magnetic screen reactor as described in claim 1, it is characterised in that：The shielding case is drum type brake.
9. a kind of novel magnetic screen reactor as described in claim 1, it is characterised in that：Shielding case is with line packet using identical
Material and technique are encapsulated.
10. a kind of novel magnetic screen reactor as described in claim 1, it is characterised in that：Increasing shielding case section reduces screen
Cover magnetic flux density is covered, when so that the reactor is passed through short circuit current, makes reactor that saturation point 1.8T be not achieved.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114335951A (en) * | 2022-01-17 | 2022-04-12 | 深圳飞骧科技股份有限公司 | Isolation method and transmission structure of radio frequency power amplifier transmission line |
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| CN2295267Y (en) * | 1997-06-03 | 1998-10-21 | 无锡市泰波电抗器厂 | Dry hollow series reactor |
| CN2359790Y (en) * | 1998-12-11 | 2000-01-19 | 西安扬子电器有限责任公司 | Magnetic shielding dry-type air reactor |
| CN202134372U (en) * | 2011-07-01 | 2012-02-01 | 桂林五环电器制造有限公司 | Magnetic shielding air-core reactor |
| KR20140095274A (en) * | 2013-01-24 | 2014-08-01 | 주식회사 만도 | Battery charger having magnetic element housing for considering noise shielding and pcb wire |
| US20160163439A1 (en) * | 2014-01-24 | 2016-06-09 | Nadder Pourrahimi | Structural support for conduction-cooled superconducting magnets |
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2017
- 2017-12-20 CN CN201711387370.5A patent/CN108183016B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2295267Y (en) * | 1997-06-03 | 1998-10-21 | 无锡市泰波电抗器厂 | Dry hollow series reactor |
| CN2359790Y (en) * | 1998-12-11 | 2000-01-19 | 西安扬子电器有限责任公司 | Magnetic shielding dry-type air reactor |
| CN202134372U (en) * | 2011-07-01 | 2012-02-01 | 桂林五环电器制造有限公司 | Magnetic shielding air-core reactor |
| KR20140095274A (en) * | 2013-01-24 | 2014-08-01 | 주식회사 만도 | Battery charger having magnetic element housing for considering noise shielding and pcb wire |
| US20160163439A1 (en) * | 2014-01-24 | 2016-06-09 | Nadder Pourrahimi | Structural support for conduction-cooled superconducting magnets |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114335951A (en) * | 2022-01-17 | 2022-04-12 | 深圳飞骧科技股份有限公司 | Isolation method and transmission structure of radio frequency power amplifier transmission line |
| US11855593B2 (en) | 2022-01-17 | 2023-12-26 | Lansus Technologies Inc. | Method for isolating transmission lines of radio frequency power amplifier and transmission structure for radio frequency power amplifier |
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