CN202422973U - Power transformer - Google Patents

Power transformer Download PDF

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Publication number
CN202422973U
CN202422973U CN2011205673230U CN201120567323U CN202422973U CN 202422973 U CN202422973 U CN 202422973U CN 2011205673230 U CN2011205673230 U CN 2011205673230U CN 201120567323 U CN201120567323 U CN 201120567323U CN 202422973 U CN202422973 U CN 202422973U
Authority
CN
China
Prior art keywords
coil
voltage
power transformer
voltage regulation
level voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN2011205673230U
Other languages
Chinese (zh)
Inventor
彭惠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TIANWEI YUNNAN TRANSFORMER CO Ltd
Original Assignee
TIANWEI YUNNAN TRANSFORMER CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TIANWEI YUNNAN TRANSFORMER CO Ltd filed Critical TIANWEI YUNNAN TRANSFORMER CO Ltd
Priority to CN2011205673230U priority Critical patent/CN202422973U/en
Application granted granted Critical
Publication of CN202422973U publication Critical patent/CN202422973U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model provides a power transformer, which comprises an iron core. A high-voltage coil, a middle-voltage coil and a low-voltage coil are sequentially arranged on the iron core, the power transformer is further provided with a coarse voltage-adjusting coil and a fine voltage-adjusting coil, and the coarse voltage-adjusting coil and the fine voltage-adjusting coil are connected in series with a high voltage coil through a voltage-adjusting switch. High impedance of the transformer is realized by means of arranging the coarse voltage-adjusting coil and the fine voltage-adjusting coil, resistive loss is reduced when maximum current is input, cost is saved, and reliability of the transformer is improved.

Description

Power transformer
Technical field
The utility model relates to the power technology field, relates in particular to a kind of power transformer, belongs to power transformer manufacturing technology field.
Background technology
In recent years, higher because of the rate of failure that short trouble causes power transformer and relevant device thereof to damage, the loss of generation is also very serious, thereby reduces short circuit current to reduce the effect of short trouble very obvious through improving short-circuit impedance in the prior art.
But existing high-impedance transformer is provided with the positive-negative voltage-regulation coil usually, adopts the positive-negative voltage-regulation switch to carry out pressure regulation; Its positive-negative voltage-regulation coil is at the minus tapping of high pressure, promptly during the high pressure maximum current, and basic coil magnetization; Voltage regulation coil magnetic field is opposite, and stray field intensity causes dispersion loss more a lot of greatly than specified tap very greatly, and its resistance loss has comprised high-tension coil resistance loss and voltage regulation coil resistance loss; Compare increase about 25~30% with specified tapping loss; The load loss of above-mentioned high-impedance transformer is bigger than the load loss of normal impedance transformer, can increase the quantity of cooler accordingly, thereby cause the cost of transformer higher.
The utility model content
The utility model provides a kind of power transformer, when realizing high impedance, reduces load loss, reduces transformer cost and weight, improves the transformer reliability.
The utility model provides a kind of power transformer; Comprise iron core; Said iron core sets gradually high-tension coil, intermediate voltage winding and low-voltage coil outward; Wherein, said power transformer also is provided with thick level voltage regulation coil and thin level voltage regulation coil, and said thick level voltage regulation coil and said thin level voltage regulation coil all are connected in series with said high-tension coil through tap changer.
Aforesaid power transformer, wherein, preferably, said thick level voltage regulation coil is arranged in the empty road of insulation between said intermediate voltage winding and the said low-voltage coil.
Aforesaid power transformer, wherein, preferably, said thin level voltage regulation coil is arranged on the outside of said low-voltage coil.
Aforesaid power transformer wherein, preferably, shields between said iron core and the said high-tension coil with being provided with.
The power transformer that the utility model provides is through being provided with thick level voltage regulation coil and thin level voltage regulation coil when realizing the transformer high impedance, and the resistance loss when having reduced the maximum current input has been practiced thrift cost, has improved the reliability of transformer.
Description of drawings
The power transformer structural representation that Fig. 1 provides for the utility model embodiment.
Embodiment
The power transformer structural representation that Fig. 1 provides for the utility model embodiment; The utility model embodiment provides a kind of power transformer; Comprise iron core 1, set gradually high-tension coil 2, intermediate voltage winding 3 and low-voltage coil 4 outside this iron core 1, wherein; This power transformer also is provided with thick level voltage regulation coil 5 and thin level voltage regulation coil 6, and thick level voltage regulation coil 5 all is connected in series with high-tension coil 2 through tap changer with thin level voltage regulation coil 6.
High-tension coil 2 is as the basic coil of voltage input side; When thick level voltage regulation coil 5 links to each other with high-tension coil 2 through tap changer with thin level voltage regulation coil 6; High pressure maximum current coil is basic coil, is connected in series into coarse adjustment and thin level voltage regulation coil through positive polarity and accomplishes the process from minus tapping to specified tap, the specified process that is switched to maximum tap; Stray field can not increase, and the load loss of maximum current is merely the load loss of the basic coil of high pressure.Two kinds of pressure adjusting structures are compared; The load loss of maximum current is than the load loss of specified tap; Coarse and fine voltage regulation reduces 75% approximately than positive-negative voltage-regulation structure, and the quantity of the cooler that the heat that produces for the transformer that leaves is provided with will reduce 15~20%, thereby reduce the cost of transformer.
Usually the impedance of transformer centering, low-voltage coil requires very big; Thereby when the insulation sky road that designs between intermediate voltage winding 3 and the low-voltage coil 4; Can will insulate size design bigger in empty road, therefore, slightly grade voltage regulation coil 5 be arranged in the insulation sky road between intermediate voltage winding 3 and the low-voltage coil 4; Big empty road in having made full use of, between the low-voltage coil has improved the utilance and the filling rate in empty road.
Further, can thin level voltage regulation coil 6 be arranged on the outside of low-voltage coil 4.
On the basis of the foregoing description, between iron core 1 and high-tension coil 2, shield with being provided with.
Resistance loss when the power transformer that the utility model embodiment provides has reduced the maximum current input through thick level voltage regulation coil is set with thin level voltage regulation coil has been practiced thrift cost, has improved the reliability of transformer.
What should explain at last is: above embodiment is only in order to the technical scheme of explanation the utility model, but not to its restriction; Although the utility model has been carried out detailed explanation with reference to previous embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the scope of each embodiment technical scheme of essence disengaging the utility model of relevant art scheme.

Claims (4)

1. power transformer; Comprise iron core; Said iron core sets gradually high-tension coil, intermediate voltage winding and low-voltage coil outward; It is characterized in that said power transformer also is provided with thick level voltage regulation coil and thin level voltage regulation coil, said thick level voltage regulation coil and said thin level voltage regulation coil all are connected in series with said high-tension coil through tap changer.
2. power transformer according to claim 1 is characterized in that, said thick level voltage regulation coil is arranged in the empty road of insulation between said intermediate voltage winding and the said low-voltage coil.
3. power transformer according to claim 2 is characterized in that, said thin level voltage regulation coil is arranged on the outside of said low-voltage coil.
4. according to the arbitrary described power transformer of claim 1-3, it is characterized in that, shield between said iron core and the said high-tension coil with being provided with.
CN2011205673230U 2011-12-30 2011-12-30 Power transformer Expired - Lifetime CN202422973U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011205673230U CN202422973U (en) 2011-12-30 2011-12-30 Power transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011205673230U CN202422973U (en) 2011-12-30 2011-12-30 Power transformer

Publications (1)

Publication Number Publication Date
CN202422973U true CN202422973U (en) 2012-09-05

Family

ID=46747709

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011205673230U Expired - Lifetime CN202422973U (en) 2011-12-30 2011-12-30 Power transformer

Country Status (1)

Country Link
CN (1) CN202422973U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105405615A (en) * 2015-12-02 2016-03-16 山东电力设备有限公司 High-impedance transformer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105405615A (en) * 2015-12-02 2016-03-16 山东电力设备有限公司 High-impedance transformer

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C14 Grant of patent or utility model
GR01 Patent grant
CX01 Expiry of patent term

Granted publication date: 20120905

CX01 Expiry of patent term