CN202816585U - High anti-lightning power transformer and dry-type or oil immersed type power transformer with the same - Google Patents
High anti-lightning power transformer and dry-type or oil immersed type power transformer with the same Download PDFInfo
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- CN202816585U CN202816585U CN 201220418622 CN201220418622U CN202816585U CN 202816585 U CN202816585 U CN 202816585U CN 201220418622 CN201220418622 CN 201220418622 CN 201220418622 U CN201220418622 U CN 201220418622U CN 202816585 U CN202816585 U CN 202816585U
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Abstract
The utility model relates to the technical field of transformers, and particularly discloses a high anti-lightning power transformer and a dry-type or oil immersed type power transformer with the high anti-lightning power transformer. The high anti-lightning power transformer comprises an iron core, a high-pressure side winding and a low-pressure side winding. The high-pressure side winding and the low-pressure side winding are respectively a three-phase winding. According to the high-pressure side winding and the low-pressure side winding, a Z-type jointing is respectively adopted. A neutral point coming out of the high-pressure winding is in jointing with the ground through a lightning arrester. A ground connection screen is respectively arranged between each phase of the high-pressure winding and each phrase of the low-pressure winding. According to the high anti-lightning power transformer and the dry-type or oil immersed type power transformer with the high anti-lightning power transformer, self capacity of bearing lightning impulse of a power distribution device can be increased, overvoltage produced by lightning waves is capable of being effectively subducted to enter a secondary device, and important devices of a machine room and the like are prevented from being damaged caused by that a lightening wave invades into a distribution wire.
Description
Technical field
The utility model relates to the transformer technology field, relates in particular to a kind of power transformer of the Gao Nailei of having performance, and contains dry type, the oil-immersed power transformer of the anti-thunder and lightning power of this height transformer.
Background technology
The lightning protection transformer that existing lightning protection power transformer normally adopts Yzn11 to connect, it can only prevent that thunder and lightning from from the direct transform voltage that the low-pressure side intrusion causes, can not prevent the reversing transformation overvoltage that thunder and lightning causes from the high-pressure side intrusion.Lightning wave often all is from the high-pressure side invasive system, and existing lightning protection transformer only is conceived to the protection of transformer self, can not effectively prevent lightning overvoltage intrusion machine room.From practical application; military project radar station, aircraft radar station, Radar-Communication station, communication base station great majority are all built on the open-air high mountain; thunderbolt is many, not only fails effectively to protect calculator room equipment, and general lightning protection power transformer self is also failed to bear thunderbolt and met with to damaging.
The reason that produces the damage of calculator room equipment and existing lightning protection transformer is the only limited thunderbolt ability of bearing of transformer body of original lightning protection measures, when low-pressure side is come thunder, connect the overvoltage that electromagnetism transform that way that winding magnetic potential reduces mutually reduces the high pressure winding produces to high pressure by Z.When thunder was come in the high-pressure side, because high pressure Y connects, lightning current can be directly delivered to low-pressure side by electromagnetism transform and capacitive sensing effect, and then invaded machine room.Moreover because existing transformer body high pressure neutral point suspends, the high-pressure side produces the current potential lifting by the lightning arrester thunder-strike current that gets off of releasing at earth connection, and inversion produces the current potential bounce-back to high pressure, so that dielectric strength deficiency to transformer damages.Therefore, use existing lightning protection transformer, both direction comes thunder all can not avoid lightning wave to invade machine room.
The utility model content
The purpose of this utility model is, propose a kind of high anti-thunder and lightning power transformer and contain its dry type, oil-immersed power transformer, it can strengthen the ability that controller switching equipment itself bears lightning impulse, and can effectively subdue the overvoltage that lightning wave produces and enter secondary device, avoid the visual plant such as machine room to invade the damage that produces from distribution wire because of lightning wave.
For achieving the above object, the utility model provides a kind of high anti-thunder and lightning power transformer, it comprises: iron core, high-pressure side winding and low-pressure side winding, this high-pressure side winding and low-pressure side winding are three phase windings, it is characterized in that, described high-pressure side winding and low-pressure side winding all adopt Z-type to connect, and the neutral point that this high-pressure side winding is drawn connects by an arrester ground, is equipped with earthing between each phase high-pressure side winding and the low-pressure side winding.
Wherein, the coil of described high-pressure side winding and low-pressure side winding respectively is divided in half into the coil of two equal numbers of turn.
Concrete, the winding of described each phase by be enclosed within this mutually a unshakable in one's determination half coil and be enclosed within another mutually unshakable in one's determination half around forming to opposite coil, each all overlap on the iron core mutually have half high-voltage coil and low-voltage coil of this phase with another mutually half around to opposite high-voltage coil and low-voltage coil.
In the utility model, described high-voltage coil and low-voltage coil forms respectively the winding that Z-type connects.
Moreover, be equipped with the pressure regulation number of turn on the outer half section coil of described each phase high-pressure side winding.
The neutral point of described high-pressure side winding is drawn with the head end of high-pressure side winding, and then connects by an arrester ground.
The neutral point of described low-pressure side winding is drawn with the head end of low-pressure side winding, and then connects by arrester ground.
Further, all be equiped with earthing between the high-voltage coil and low-voltage coil of described each phase winding, described three-phase ground screen is done ground connection connection through connecting wire together afterwards.
Further, the utility model also provides a kind of dry-type power transformer, and it contains the anti-thunder and lightning power of aforesaid height transformer.
In addition, the utility model also provides a kind of oil-immersed power transformer, and it contains the anti-thunder and lightning power of aforesaid height transformer.
Height of the present utility model anti-thunder and lightning power transformer and contain its dry type, oil-immersed power transformer, the mode that it connects by the hyperbolic folding, the high and low pressure side winding all adopts Z-type to connect, no matter high pressure or low-pressure side winding are subject to the impulse stress effect, the side that is hit winding is cancelled out each other at the magnetic flux that every mutually iron core produces, all can not produce the effect of high and low pressure electromagnetic coupled, can be at opposite side winding inductive electromagnetic inductive component all, thus strengthened the lightning protection properties of transformer; Simultaneously; it is equiped with earthing between the high and low pressure side winding; can add lightning arrester protection to the high-pressure side neutral point of transformer; and the suspension vibration overvoltage that the neutral point of transformer produces 2U0 because of the inverse transformation process easy keypoint part that damages of lightning strikes just adds and fastens the vibration overvoltage of deciding the high pressure neutral point behind the protection of arrester and then just in time can address this problem.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the draw bail schematic diagram of a kind of specific embodiment of height of the present utility model anti-thunder and lightning power transformer;
Fig. 2 is the high pressure zero sequence magnetic flux figure of a kind of specific embodiment of height of the present utility model anti-thunder and lightning power transformer;
Fig. 3 is the low pressure zero sequence magnetic flux figure of a kind of specific embodiment of height of the present utility model anti-thunder and lightning power transformer;
Fig. 4 is the principle schematic that the anti-thunder and lightning power of height of the present utility model transformer arranges the high-low voltage capacitor shielding.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, the utility model provides a kind of high anti-thunder and lightning power transformer, it comprises: (not shown) unshakable in one's determination, high-pressure side winding 10 and low-pressure side winding 20, this high-pressure side winding 10 and low-pressure side winding 20 are three phase windings, described high-pressure side winding 10 and low-pressure side winding 20 all adopt Z-type to connect, the neutral point that this high-pressure side winding 10 is drawn connects by a lightning arrester R ground connection, is equipped with earthing 30 between each phase high-pressure side winding 10 and the low-pressure side winding 20.At present, the bind mode of power transformer national Specification has 5 kinds, is respectively Yyn0, Yd11, YNd11, YNy0, Yy0 mode.The high-pressure side winding that is used for Domestic Transformers generally all adopts the Y connection, this kind transformer can only prevent the direct transform voltage that thunder and lightning causes from the intrusion of low-pressure side winding, can not prevent from invading the reversing transformation overvoltage that causes from the high-pressure side winding, and the utility model can be subdued the electromagnetic induction transmission between the high and low pressure side winding by the hyperbolic folding bind mode that high-pressure side winding 10 and low-pressure side winding 20 adopt Z-type to connect simultaneously.Simultaneously, the utility model carries out lightning protection earthing by the neutral point to high-pressure side winding 10, can fasten the vibration overvoltage amplitude of deciding the high pressure neutral point.In addition, the utility model is also by installing earthing 30 additional between high and low pressure side winding 10,20, the electric capacity transmission in the time of can shielding thunder and lightning and produce.
Wherein, the coil of described high-pressure side winding 10 and low-pressure side winding 20 respectively is divided in half into the coil of two equal numbers of turn.In the utility model specific embodiment, the winding of described each phase by be enclosed within this mutually a unshakable in one's determination half coil and be enclosed within another mutually unshakable in one's determination half around forming to opposite coil, each all overlap on the iron core mutually have half high-voltage coil and low-voltage coil of this phase with another mutually half around to opposite high-voltage coil and low-voltage coil.By above-mentioned setting, form the mode that the hyperbolic folding connects, namely high-voltage coil and low-voltage coil forms respectively the winding that Z-type connects.As a kind of preferred embodiment of the present utility model, can also the pressure regulation number of turn (not shown) be set at the outer half section coil of each phase high-pressure side winding.The setting of this pressure regulation number of turn can realize by the number of turn that changes the high-pressure side winding purpose of pressure regulation, thereby changes the no-load voltage ratio of transformer.
In the utility model, the neutral point of described high-pressure side winding 10 is drawn with head end A, B, the C of high-pressure side winding 10, and then connects by a lightning arrester R ground connection.Because the transformer that common high-pressure side winding Y connects is when low-pressure side thunderbolt or high-pressure side thunderbolt, low pressure current potential lifting meeting causes the bounce-back of neutral point appearance potential, reaches as high as 2 times of overvoltage value, and this also is the main cause that common lightning protection transformer damages.Lightning arrester on 0 line of the utility model high-pressure side winding 10 can discharge transformer neutral point and be strikeed back overvoltage, and by with the neutral point of high-pressure side winding 10 with head end A, the B of high-pressure side winding 10, the C mode through lightning arrester R ground connection, can limit the current potential lifting of high-pressure side winding 10 neutral points, thereby guarantee that transformer neutral point is not damaged by high electrical breakdown.In the utility model specific embodiment, the neutral-point solid ground of described low-pressure side winding 20, head end a, the b of low-pressure side winding 20, c draw together, and then connect by lightning arrester R ground connection.This high-pressure side of the utility model winding 10 is drawn the mode that neutral point carries out lightning protection simultaneously with low-pressure side winding 20, the overvoltage Limiting that the transformer head end may be able to be occurred in the scope that transformer can bear, thereby guarantee the security performance of transformer.
In the utility model, the voltage of described high-pressure side winding 10 is generally more than 10000 volts, and the voltage of low-pressure side winding 20 is generally below 400 volts.When 2 phases of high-pressure side winding 10 or 3 phase incoming waves are invaded (shown in Figure 2), because high pressure two half coils around on the contrary on every post iron core, large the equating of " zero sequence " magnetic flux that per half coil that lightning current causes produces, opposite direction, cancel out each other, be that every post magnetic flux unshakable in one's determination is zero, lightning overvoltage just can not sensed low pressure in the mode of electromagnetic induction like this, cancels each other and has limited to a certain extent the overvoltage of high-pressure side winding 10 turn-to-turns, interlayer owing to its zero sequence magnetic flux simultaneously.Therefore; can obviously find out; after high-pressure side winding 10 adopts Z-type to connect; can draw the high-pressure side neutral point of transformer; we just can add lightning arrester protection to the high-pressure side neutral point of transformer like this; and the suspension vibration overvoltage that the neutral point of transformer produces 2U0 because of the inverse transformation process easy keypoint part that damages of lightning strikes just adds and fastens the vibration overvoltage of deciding the high pressure neutral point behind the protection of arrester and just in time can address this problem.
As shown in Figure 3,2 phases when low-pressure side winding 20, or 3 phase incoming wave when invading, or the high pressure incoming wave produces the voltage lifting when causing that low-voltage side coil flows through zero-sequence current at earth connection because of thunder and lightning with flowing, because low pressure two half coils around on the contrary on every post iron core, large the equating of " zero sequence " magnetic flux that per half coil that lightning current causes produces, opposite direction, cancel out each other, be that every post magnetic flux unshakable in one's determination is zero, lightning overvoltage just can not sensed high pressure in the mode of electromagnetic induction and produce inverse transformation like this, thereby eliminated the overvoltage that inverse transformation process produces in high-tension coil, avoided the damage of transformer high-voltage coil.
For transformer general in the prior art, its winding can be by zero-sequence current in the winding inductance under Impulse Voltage, and the magnetic flux that produces will induce voltage in the opposite side winding, and this voltage is exactly the electromagnetic induction component.The electromagnetic induction component is relevant with the no-load voltage ratio of Transformer Winding, but under shock wave, in the iron core loss very large, so be not again proportional with no-load voltage ratio.The ratio of specified phase voltage (impulse withstand voltage with) is more much bigger than high-pressure side winding 10 because the relative impact strength of low-pressure side winding 20, therefore, when the overvoltage ripple that every high-pressure side winding 10 can tolerate is delivered to low-pressure side winding 20 by no-load voltage ratio, low-pressure side winding 20 is safe from danger.But, this electromagnetic induction component when low-pressure side winding 20 afferent echo or the high pressure incoming wave produce the voltage lifting when causing that low-voltage side coil flows through zero-sequence current at earth connection because of thunder and lightning with flowing, the inverse transformation that produces probably causes danger in high-pressure side winding 10, it often become distribution transformer the low-pressure side circuit be struck by lightning or the high pressure incoming wave because thunder and lightning produces the voltage lifting when causing that low-voltage side coil flows through zero-sequence current at earth connection with flowing, the accident cause of high-pressure side winding 10 insulation breakdowns occurs.And the anti-thunder and lightning power of height of the present utility model transformer, no matter high-pressure side or low-pressure side winding are subject to the impulse stress effect, owing to adopted hyperbolic folding bind mode, the side that is hit winding is cancelled out each other at the magnetic flux that every mutually iron core produces, all can not produce the effect of high and low pressure electromagnetic coupled, can be in opposite side winding electric magnetic induction component, thus strengthened the lightning protection properties of transformer.
Further, as preferred embodiment of the present utility model, all be equiped with earthing 30 between the high and low pressure coil 12,22 of each phase winding, this three-phase ground screen 30 is done ground connection connection through connecting wire together afterwards.Can transmit the overvoltage except the electromagnetic induction component between the transformer high-low-voltage side winding 10,20, because Existential Space electric capacity between inner each electrode of transformer, electric capacity between the high and low pressure coil 12,22 large (winding alternate and with the annex such as iron core between electric capacity very I ignore), two interpolars of electric capacity can carry out the capacitive coupling transmission to alternating current.Lightning current is the very high alternating current of frequency just, therefore common lightning protection transformer can not shield lightning current in the transmission of high and low pressure side winding, earthing 30 is equivalent to insert an earth electrode at two interpolars of electric capacity, thereby make the high and low pressure side winding form electric capacity (shown in Figure 4) to earth electrode respectively, when the height either side suffers surge voltage, its capacitance current all flows into ground network by earthing 30, and can not form the electric capacity transmission between opposite side.
The anti-thunder and lightning power of height of the present utility model transformer; its structure can be protected transformer itself; and because the high and low pressure side winding is Z-shaped connection; zero sequence electromagnetic induction transmission to lightning current all can effectively be subdued; only capacitive sensing transmission channels shields owing to installed earthing 30 additional between the high and low pressure side winding between the high-low pressure; can not cause overvoltage at low-pressure side winding 20, thereby the assurance lightning wave can directly not invaded machine room.
The anti-thunder and lightning power of height of the present utility model transformer both can be applied to can be applied to oil-immersed power transformer again in the dry-type power transformer.Therefore, the utility model also provides a kind of dry-type power transformer, and it contains the anti-thunder and lightning power of aforesaid height transformer, and in addition, it also includes the parts such as holder and insulating part (not shown).In addition, the utility model also provides a kind of oil-immersed power transformer, and it contains the anti-thunder and lightning power of aforesaid height transformer equally, and in addition, it also includes shell, fuel tank, insulating oil and draws the parts (not shown) such as insulating sleeve.The difference of this dry-type power transformer and oil-immersed power transformer is that dry-type power transformer does not have fuel tank, and its high-tension coil and low-voltage coil are respectively with resin-encapsulate cast or wrapped seal or dipping lacquer is sealed processing; And in the oil-immersed power transformer, the anti-thunder and lightning power of aforesaid height transformer is loaded in the fuel tank and and is immersed in the insulating oil.This dry-type power transformer and oil-immersed power transformer all have preferably lightning protection properties, no matter high pressure or low-pressure side winding are subject to the impulse stress effect, the side that is hit winding is cancelled out each other at the magnetic flux that every mutually iron core produces, all can not produce the effect of high and low pressure electromagnetic coupled, can be in opposite side winding electric magnetic induction component; Simultaneously, the ability that its its controller switching equipment of unit that can strengthen use the utility model products such as military project radar station, aircraft radar station, Radar-Communication station, communication base station itself bears lightning impulse, and can effectively subdue the overvoltage intrusion secondary device that lightning wave produces, avoid invading the damage that produces such as visual plants such as machine rooms from distribution line because of lightning wave.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1. one kind high anti-thunder and lightning power transformer, comprise: iron core, high-pressure side winding and low-pressure side winding, this high-pressure side winding and low-pressure side winding are three phase windings, it is characterized in that, described high-pressure side winding and low-pressure side winding all adopt Z-type to connect, the neutral point that this high-pressure side winding is drawn connects by an arrester ground, is equipped with earthing between each phase high-pressure side winding and the low-pressure side winding.
2. the anti-thunder and lightning power of height as claimed in claim 1 transformer is characterized in that, the coil of described high-pressure side winding and low-pressure side winding respectively is divided in half into the coil of two equal numbers of turn.
3. the anti-thunder and lightning power of height as claimed in claim 1 transformer, it is characterized in that, the winding of described each phase by be enclosed within this mutually a unshakable in one's determination half coil and be enclosed within another mutually unshakable in one's determination half around forming to opposite coil, each all overlap on the iron core mutually have half high-voltage coil and low-voltage coil of this phase with another mutually half around to opposite high-voltage coil and low-voltage coil.
4. the anti-thunder and lightning power of height as claimed in claim 3 transformer is characterized in that, described high-voltage coil and low-voltage coil forms respectively the winding that Z-type connects.
5. the anti-thunder and lightning power of height as claimed in claim 3 transformer is characterized in that, is equipped with the pressure regulation number of turn on the outer half section coil of described each phase high-pressure side winding.
6. the anti-thunder and lightning power of height as claimed in claim 1 transformer is characterized in that, the neutral point of described high-pressure side winding is drawn with the head end of high-pressure side winding, and then connects by an arrester ground.
7. the anti-thunder and lightning power of height as claimed in claim 6 transformer is characterized in that, the neutral-point solid ground of described low-pressure side winding, and the head end of low-pressure side winding connects by arrester ground.
8. the anti-thunder and lightning power of height as claimed in claim 3 transformer is characterized in that, all is equiped with earthing between the high-voltage coil and low-voltage coil of described each phase winding, and described three-phase ground screen is done ground connection connection through connecting wire together afterwards.
9. a dry-type power transformer is characterized in that: contain just like the anti-thunder and lightning power of the described height of any one in the claim 1 to 8 transformer.
10. an oil-immersed power transformer is characterized in that: contain just like the anti-thunder and lightning power of the described height of any one in the claim 1 to 8 transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220418622 CN202816585U (en) | 2012-08-22 | 2012-08-22 | High anti-lightning power transformer and dry-type or oil immersed type power transformer with the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220418622 CN202816585U (en) | 2012-08-22 | 2012-08-22 | High anti-lightning power transformer and dry-type or oil immersed type power transformer with the same |
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| CN202816585U true CN202816585U (en) | 2013-03-20 |
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| CN 201220418622 Expired - Fee Related CN202816585U (en) | 2012-08-22 | 2012-08-22 | High anti-lightning power transformer and dry-type or oil immersed type power transformer with the same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632816A (en) * | 2012-08-22 | 2014-03-12 | 重庆市帝迅电气科技有限公司 | High-lightning-resistant power transformer and dry or oil-immersed power transformer including same |
| CN105355401A (en) * | 2015-11-23 | 2016-02-24 | 铜陵瑞博电子科技有限公司 | Lightening proof transformer |
| CN105513766A (en) * | 2016-01-06 | 2016-04-20 | 沈阳飞驰电气设备有限公司 | Quadripartion photovoltaic power generation lightning protection pre-assembled transformer substation |
| CN106920655A (en) * | 2017-04-18 | 2017-07-04 | 重庆祥龙电气股份有限公司 | A kind of alternating expression lightning protection transformer |
| CN107134358A (en) * | 2016-02-26 | 2017-09-05 | 艾默生网络能源有限公司 | A kind of inductance winding method and device |
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2012
- 2012-08-22 CN CN 201220418622 patent/CN202816585U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632816A (en) * | 2012-08-22 | 2014-03-12 | 重庆市帝迅电气科技有限公司 | High-lightning-resistant power transformer and dry or oil-immersed power transformer including same |
| CN105355401A (en) * | 2015-11-23 | 2016-02-24 | 铜陵瑞博电子科技有限公司 | Lightening proof transformer |
| CN105513766A (en) * | 2016-01-06 | 2016-04-20 | 沈阳飞驰电气设备有限公司 | Quadripartion photovoltaic power generation lightning protection pre-assembled transformer substation |
| CN107134358A (en) * | 2016-02-26 | 2017-09-05 | 艾默生网络能源有限公司 | A kind of inductance winding method and device |
| US10763039B2 (en) | 2016-02-26 | 2020-09-01 | Vertiv Tech Co., Ltd. | Inductor winding method and inductor winding device |
| CN112700961A (en) * | 2016-02-26 | 2021-04-23 | 维谛技术有限公司 | Inductor winding method for reducing power frequency magnetic flux density of coupling inductor and coupling inductor with low power frequency magnetic flux density |
| CN106920655A (en) * | 2017-04-18 | 2017-07-04 | 重庆祥龙电气股份有限公司 | A kind of alternating expression lightning protection transformer |
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