CN205645496U - Dry -type air -core reactor lower extreme magnetism shielding structure - Google Patents
Dry -type air -core reactor lower extreme magnetism shielding structure Download PDFInfo
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- CN205645496U CN205645496U CN201520996576.8U CN201520996576U CN205645496U CN 205645496 U CN205645496 U CN 205645496U CN 201520996576 U CN201520996576 U CN 201520996576U CN 205645496 U CN205645496 U CN 205645496U
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Abstract
The utility model discloses a dry -type air -core reactor lower extreme magnetism shielding structure sets up the lower extreme in dry -type air -core reactor through support piece, a serial communication port, cylindric shield including the central through hole, it has at least one supported hole to run through on the shield, is equipped with the flange bolt hole that is used for fixed support in the supported hole. The utility model discloses a shield adopts discoid magnetic materials, effectively reduces dry -type reactor below along the influence of axial magnetic leakage to the ground net, has reduced reactor below along axial leakage magnetic field burble in substation grounding grid's metallic conductor, has avoided the vortex to result in the local loss of grounding body too big, and it is serious to generate heat, destroys the risk of ground net even.
Description
Technical field
This utility model relates to the electromagnetic shielding field of power system, is specifically related to a kind of dry-type air-core reactor lower end magnet shielding structure.
Background technology
Dry-type air-core reactor is widely used in power system, and it has that the linearity is good, lightweight, mechanical strength is high, noise is low and the advantage such as easy to maintenance.But, due to its hollow-core construction, causing dry-type air-core reactor to be in operation can produce bigger stray field about, and therefore, it is also one of major electromagnetic polluter in power system.When reactor takes up an area limited space; if not taking shielding measure; the leakage field of reactor can disturb the properly functioning of the equipment such as neighbouring instrument and meter, protection device; maybe can affect and be exposed to the health of human body of staff under this magnetic field; the magnetic conductive metal bodies such as the fence that is also possible to around reactor, framework, grounding body produce faradic current; causing added losses even damage equipment, the magnetic field that faradic current produces can affect the most again the properly functioning of reactor.When dry-type air-core reactor is applied to transformer station, below reactor, stray field vertically can produce eddy current in the metallic conductor of grounding net of transformer substation, and grounding body Localized wear can be caused when leakage field is serious excessive, and heating is serious, even destroys grounded screen.
For solving this electromagnetic pollution, special based on power frequency magnetic field shielding principle, need to consider to arrange in reactor lower end shield, obtain the stray field screen method of dry-type air-core reactor, reduce the reactor impact on grounded screen.
Utility model content
The purpose of this utility model is for above-mentioned problems of the prior art, proposes a kind of dry-type air-core reactor lower end magnet shielding structure, based on power frequency magnetic field shielding principle, it is achieved the stray field shield effectiveness of dry-type air-core reactor.
For reaching the purpose of above-mentioned utility model, this utility model is achieved through the following technical solutions:
A kind of dry-type air-core reactor lower end magnet shielding structure, it is arranged at dry-type air-core reactor lower end by support member, including the cylindric shield of central through hole, described shield runs through at least one supported hole, is provided with the flange bolt hole for securing supports in supported hole.
Described shield is that the magnetic conductor of at least two segment is put together.
At least one supported hole it is provided with on described magnetic conductor.
At least one supported hole described is located at the outer edge of magnetic conductor.
Described supported hole is six, and magnetic conductor is four, is respectively 1/4th segments, is wherein two first fan-shaped magnetic conductors, it is respectively arranged with two supported holes；Another two is the second fan-shaped magnetic conductor, and it is respectively arranged with a supported hole.
Described supported hole can be all connected with a support member on shield two sides.
A kind of dry-type air-core reactor lower end of the present utility model magnet shielding structure, has the advantages that
1, the impact on grounded screen of the leakage field vertically is effectively reduced below dry reactor, reduce below reactor stray field vertically in the metallic conductor of grounding net of transformer substation, produce eddy current, avoiding eddy current causes grounding body Localized wear excessive, and heating is serious, even destroys the risk of grounded screen.
2, magnet shielding structure space arranges that can meet good Magnetic Shielding Effectiveness can meet again original equipment transformation feasibility needs, and improvement cost is low, effective.
3, the structure of shield is less on inductance, the CURRENT DISTRIBUTION impact of reactor, does not affect the properly functioning of reactor.
Accompanying drawing explanation
Fig. 1 is the metallic aluminium shielding action schematic diagram to magnetic field of high conductivity.
Fig. 2 is the structural representation of dry-type air-core reactor lower end of the present utility model magnet shielding structure.
Fig. 3 is the application schematic diagram of dry-type air-core reactor lower end of the present utility model magnet shielding structure.
Detailed description of the invention
With embodiment, the technical scheme in this utility model embodiment is clearly and completely described below in conjunction with the accompanying drawings, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole embodiment.
For the feature that dry-type air-core reactor power frequency stray field is big, according to different shielding requirements, shielding principle is shunted based on magnetic flux, ferromagnetic material is used to make shield, utilize the high permeance of ferromagnetic material, beam of magnetic line of force is tied to Ferromagnetic Material, changes magnetic line of force direction, to reach shield effectiveness.
Referring to Fig. 1, for the metallic aluminium of the high conductivity shielding action schematic diagram to magnetic field.For the feature that dry-type air-core reactor power frequency stray field is big, according to different shielding requirements, based on eddy-current screen principle, the shielding material using high conductivity forms eddy current under time-varying magnetic field in shield, thus causes the magnetic field contrary with in-field, offsets the former magnetic field of part, simultaneously, eddy current also can produce Joule heat loss in shield, makes electromagnetic energy decay further, thus reaches the effect of shielding.Eddy-current screen usefulness is mainly affected by the physical dimension such as electrical conductivity, pcrmeability and shield thickness and the armoured magnetic field frequency of shield material.
Fig. 2 and Fig. 3, for structural representation and the application schematic diagram of dry-type air-core reactor lower end of the present utility model magnet shielding structure.
A kind of dry-type air-core reactor lower end of the present utility model magnet shielding structure, it is arranged at dry-type air-core reactor 2 lower end by support member, in the present embodiment, support member is divided into upper supporting piece 21 and lower support element 22, upper supporting piece 21 upper end is fixed below dry-type air-core reactor 2, its lower end is connected with lower end of the present utility model magnet shielding structure, described lower end magnet shielding structure includes the cylindric shield 1 of central through hole 14, run through on described shield 1 and have at least one supported hole 15, in supported hole 15, be provided with the flange bolt hole for securing supports.As specific embodiment, described cylindric shield uses has certain thickness disc structure, and shield material is that (relativepermeabilityμr=1.000 021, electrical conductivity is γ=3.8 × 10 to metallic aluminium7S/m), shield uses certain thickness hollow circular aluminium sheet, and a diameter of 2890mm of aluminium sheet, inflated diameter is 800mm, and aluminium plate thickness refers to the aluminum depth of penetration d aluminum when power frequency (by depth of penetration formulaObtain: dAluminum=11.54619mm) it is defined as 8mm.Aluminium sheet shield effectiveness is relevant to dry-type air-core reactor radial distance with aluminium sheet, considers field apparatus situation, and aluminium sheet is installed under reactor support insulator in end flange face, is 1354mm away from reactor winding distance.
Further, described shield 1 is that the magnetic conductor 11,12 of at least two segment is put together, and in Fig. 2, gap 13 is the combination border of adjacent segment.
Further, described magnetic conductor 11,12 is provided with at least one supported hole 15.At least one supported hole 15 described is located at the outer edge of magnetic conductor 11,12.
Further, through hole 14 centered by the disk lower central after the split of described at least two sector magnetic conductor 11,12.
Described supported hole 15 is six, and magnetic conductor is four, is respectively 1/4th segments, and two of which is the first fan-shaped magnetic conductor 11, and it is respectively arranged with two supported holes 15；Another two is the second fan-shaped magnetic conductor, and it is respectively arranged with a supported hole 15.
Described supported hole 15 can be all connected with a support member on shield 11,12 two sides, and in the present embodiment, upper supporting piece 21 and lower support element 22 can be fixed on same supported hole, and lower support element 22 is used for supporting above-mentioned lower end magnet shielding structure and dry-type air-core reactor；
Further, as an embodiment, upper supporting piece uses ceramic leg insulator, and lower support element 22 uses glass fibre reinforced plastic backbone insulator.
It is mounted on dry-type air-core reactor top, chopper (sign) the near-end 150mm away from dry-type air-core reactor, far-end 250mm by insulating support (sign).After dry-type air-core reactor is provided above shield.Simulation result shows, after dry-type air-core reactor upper end arranges shield, it is possible to guides magnetic flux above dry-type air-core reactor well, makes shield upper area field weakening.Meanwhile, the structure of shield is less on inductance, the CURRENT DISTRIBUTION impact of reactor, therefore can guarantee that the properly functioning of reactor.
Above-described embodiment is only in order to illustrate this utility model and and technical scheme described by unrestricted this utility model；Therefore, although this specification has been carried out detailed description with reference to each above-mentioned embodiment to this utility model, but, it will be understood by those within the art that, still this utility model can be modified or equivalent；And all are without departing from the technical scheme of spirit and scope of the present utility model and improvement thereof, it all should be contained in the middle of right of the present utility model.
Claims (6)
1. a dry-type air-core reactor lower end magnet shielding structure, it is arranged at dry-type air-core reactor lower end by support member, it is characterized in that, include the cylindric shield of central through hole, run through on described shield and have at least one supported hole, in supported hole, be provided with the flange bolt hole for securing supports.
Dry-type air-core reactor lower end the most according to claim 1 magnet shielding structure, it is characterised in that described shield is that the magnetic conductor of at least two segment is put together.
Dry-type air-core reactor lower end the most according to claim 2 magnet shielding structure, it is characterised in that be provided with at least one supported hole on described magnetic conductor.
4. according to the dry-type air-core reactor lower end magnet shielding structure described in claims 1 to 3 any one, it is characterised in that at least one supported hole described is located at the outer edge of magnetic conductor.
Dry-type air-core reactor lower end the most according to claim 4 magnet shielding structure, it is characterised in that described supported hole is six, fan-shaped magnetic conductor is four, is respectively 1/4th segments, and two of which is the first fan-shaped magnetic conductor, and it is respectively arranged with two supported holes；Another two is the second fan-shaped magnetic conductor, and it is respectively arranged with a supported hole.
Dry-type air-core reactor lower end the most according to claim 5 magnet shielding structure, it is characterised in that described supported hole can be all connected with a support member on shield two sides.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520996576.8U CN205645496U (en) | 2015-12-04 | 2015-12-04 | Dry -type air -core reactor lower extreme magnetism shielding structure |
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| CN201520996576.8U CN205645496U (en) | 2015-12-04 | 2015-12-04 | Dry -type air -core reactor lower extreme magnetism shielding structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109616300A (en) * | 2018-12-27 | 2019-04-12 | 山东大学 | A kind of magnet shielding structure of smoothing reactor |
| CN109659125A (en) * | 2018-12-05 | 2019-04-19 | 山东电力设备有限公司 | A kind of magnetic field shielding device for dry-type hollow smoothing reactor |
| CN110277220A (en) * | 2019-07-17 | 2019-09-24 | 广东电网有限责任公司 | A kind of downfield dry-type air-core reactor |
| CN112563001A (en) * | 2020-11-30 | 2021-03-26 | 国网新疆电力有限公司电力科学研究院 | Shielding device for dry-type reactor peripheral electromagnetic environment |
-
2015
- 2015-12-04 CN CN201520996576.8U patent/CN205645496U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109659125A (en) * | 2018-12-05 | 2019-04-19 | 山东电力设备有限公司 | A kind of magnetic field shielding device for dry-type hollow smoothing reactor |
| CN109616300A (en) * | 2018-12-27 | 2019-04-12 | 山东大学 | A kind of magnet shielding structure of smoothing reactor |
| CN110277220A (en) * | 2019-07-17 | 2019-09-24 | 广东电网有限责任公司 | A kind of downfield dry-type air-core reactor |
| CN112563001A (en) * | 2020-11-30 | 2021-03-26 | 国网新疆电力有限公司电力科学研究院 | Shielding device for dry-type reactor peripheral electromagnetic environment |
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