CN105957700A - Method for eliminating circulation in winding of high impedance power transformer - Google Patents
Method for eliminating circulation in winding of high impedance power transformer Download PDFInfo
- Publication number
- CN105957700A CN105957700A CN201610240789.7A CN201610240789A CN105957700A CN 105957700 A CN105957700 A CN 105957700A CN 201610240789 A CN201610240789 A CN 201610240789A CN 105957700 A CN105957700 A CN 105957700A
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- Prior art keywords
- circulation
- winding
- current
- transformer
- current transformer
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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
- H01F27/341—Preventing or reducing no-load losses or reactive currents
-
- 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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
Relating to the technical field of electric power, the invention provides a method for eliminating circulation in a winding of a high impedance power transformer. The method consists of: designing a low-voltage coil into a continuous coil winded by a first lead 1, a second lead 2 and a third lead 3 in parallel connection, when wires are led out from the low-voltage coil, mounting a first current transformer CT1, a second current transformer CT2 and a third current transformer CT3 on the three leads of every phase respectively; turning over the second current transformer CT2 by 180 degrees; connecting the dotted terminals of the first current transformer CT1 and the third current transformer CT3, and connecting the dotted terminal of the second current transformer CT2 reversely into a point. The method for eliminating circulation in the winding of the high impedance power transformer provided by the invention reduces the load loss to reach the national standard, and eliminates circulation in the winding of the high impedance power transformer, thereby lowering the oil surface temperature rise and winding temperature rise of the transformer. The method provided by the invention has the advantages of simple structure, reasonable setting, and low manufacturing cost, etc.
Description
Technical field
The present invention relates to technical field of electric power, be specifically related to a kind of high-impedance electric power transformer and eliminate the method for circulation in winding.
Background technology
The low-voltage coil of multiple conducting wires parallel connection coiling, in addition to by rated current IH, also has circulation circulation between parallel conducting wire.Owing to loop construction is different, circulation to be calculated exactly and loss that circulation causes eliminate circulation and the loss that causes is relatively difficult.The transformator installing set, eliminates the circulation in coil, reduces the load loss of transformator, reduces transformer oil surface temperature rise and the temperature rise of coil, is impossible.
Summary of the invention
Present invention aims to defect and the deficiency of prior art, it is provided that a kind of circulation that can eliminate in high-impedance transformer low-voltage coil, reduce the load loss of transformator, thus reduce pasta temperature rise and the temperature rise of coil of transformator.For achieving the above object, the technical solution used in the present invention is:
1, low-voltage coil is designed to first wire the 1, second wire 2, the continuous winding of privates 3 three of the wires parallel connection coiling, at low-voltage coil x, y, during z lead-out wire, every phase three of the wires is separately installed with first Current Transmit the 1, second Current Transmit the 2, the 3rd Current Transmit 3；And the second Current Transmit 2 is overturn 180 °；
2, the Same Name of Ends of the first Current Transmit the 1, the 3rd Current Transmit 3 is linked up, with the Same Name of Ends reversal connection of the second Current Transmit 2, be connected into a bit.
The principle of the present invention is: circulation Producing reason be first wire the 1, second wire 2, privates 3 three of the wires and around continuous winding, at the first wire 1, the leakage reactance electromotive force produced in privates 3 is equal, and the leakage reactance electromotive force produced more than the second wire 2, first wire 1, it is formed for two loops between privates 3 and the second wire 2, loop just has circulation circulate.We design a loop, increase the reactance value of circulation in circulation loop, make Z-∞, and circulation cannot circulate.Convert the reactance value in two circulation loops, be also equal to Z-∞, then, circulation can not circulate.The loss that circulation produces does not exists.Concrete grammar is: during low-voltage coil lead-in wire, in the three of the wires of every phase, be respectively mounted the first Current Transmit 1, the second Current Transmit 2, the 3rd Current Transmit 3.And the second Current Transmit 2, turn over turnback.By the first Current Transmit 1, the Same Name of Ends of the 3rd 3 two transformers of Current Transmit couples together, and with the Same Name of Ends reversal connection of the second Current Transmit 2, form a bit.So, the first circulation i12, the second circulation i23, the secondary side at current transformer induces electric current i1、i2、i3.Due to i1、i3And i2Equal in magnitude, in opposite direction and can not circulate.It may also be said that the reactance value Z--∞ in the secondary side circuit of current transformer, conversion to primary side i12、i23Loop in, the reactance value in loop remains Z--∞, therefore, circulation i12、i23Can not circulate.So, the electric current in each wire is no longer added with circulation.Then: I1=I2=I3.The electric current that the rated current that three of the wires flows through senses on transformer still can circulate.And the energy of current transformer consumption is the least, it is negligible.Thus, reach to reduce transformer load loss and the purpose of temperature rise.
After using said structure, what the present invention produced has the beneficial effect that high-impedance electric power transformer of the present invention eliminates the method for circulation in winding, circulation in energy eliminating transformer low-voltage coil, reducing load loss and the temperature rise of transformator, the present invention has simple in construction, arranges the advantages such as reasonable, cost of manufacture is low.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the present invention.
Detailed description of the invention
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, obviously, accompanying drawing in describing below is only one embodiment of the present of invention, and is also suitable the high-impedance electric power transformer of different capabilities.
Referring to as it is shown in figure 1, the specific embodiment of the invention adopts the following technical scheme that it comprises the steps of:
1, low-voltage coil is designed to first wire the 1, second wire 2, the continuous winding of privates 3 three of the wires parallel connection coiling, when low-voltage coil lead-out wire, every phase three of the wires is separately installed with first Current Transmit the 1, second Current Transmit the 2, the 3rd Current Transmit 3；And the second Current Transmit 2 is overturn 180 °；
2, the Same Name of Ends of the first Current Transmit the 1, the 3rd Current Transmit 3 is linked up, with the Same Name of Ends reversal connection of the second Current Transmit 2, be connected into a bit.
The principle of the present invention is: the first circulation i between the first Current Transmit 1 and the second Current Transmit 212, the second circulation i between the second Current Transmit 2 and the 3rd Current Transmit 323The electric current induced at the secondary side of current transformer is respectively i1、i2、i3, due to i1、i3And i2Size of current equal, in opposite direction, therefore, electric current can not circulate.Alternatively the reactance value in Current Transformer Secondary side loop is Z--∞, conversion to primary side the first circulation i12, the second circulation i23Loop remains Z--∞, therefore the first circulation i12, the second circulation i23Can not circulate, so, the electric current in each wire is no longer added with circulation, then flows through three of the wires the first current in wire I1, the second current in wire I2, privates electric current I3In: I1=I2=I3.The electric current that three of the wires is sensed in Current Transformer Secondary side still can circulate, and therefore, the energy that first Current Transmit the 1, second Current Transmit the 2, the 3rd Current Transmit 3 is consumed is the least, is negligible.
The specific embodiment of the invention: be to a SFZ-60000/110 high-resistance on-load voltage-regulating power transformer, test.First, at phase current equal to 25%IHTime, measure and do not fill current transformer CT1, CT2, CT3 time phase current and the electric current of every transposed conductor: I1=132.6, I2=94.6, I3=144.2. loads onto Current Transmit 1, CT2, CT3, and by diagram wiring after, recording result is: I1=123.6A, I2=118.8A, I3=128A.It will be seen that circulation is essentially eliminated.But, owing to winding has obvious shortcoming in coiling, the first wire 1, privates 3 transposed conductor electric current unequal, cause circulation not to be completely eliminated.If the electric current on the first wire 1, privates 3 is equal, circulation can all eliminate.According to the reading on watt meter, calculate circulation loss equal to 7.4KW.
For SFZ-60000/110 high-resistance on-load voltage-regulating power transformer, in order to make its load loss less than standard value 279KW, the value of calculation of load loss is 252KW, is the 90% of standard value, and added losses account for basic loss 22.8%.Even if added losses increase to 36%, the value of load loss PK is just equal to standard value, and the added losses of transformator are not more than 279KW.
While it is true, when manufacture test, the added losses value of transformator reaches 341KW still above value of calculation, PK measured value, cause load loss overproof 22.2%.In order to make the reason that added losses increase clear, we have done tests below.
Before test, first device body is hung out from fuel tank, check that coil turn-to-turn is the most short-circuit.After determining that coil does not has short trouble, use 25%IH(new standard should be 50%I to the load loss of the value every phase of measurementH).When test, ambient temperature is 35 DEG C, 100%I converted by the measured value of B phaseHLoad loss during electric current, exactly equal to device body are placed in fuel tank uses 100%IHThe load loss value that electric current records.
K in formula1, K2The multiple of-current transformer
The reading of W-B phase watt meter
IH-low-voltage rated electric current
I1The measured value of-low pressure 25%IH electric current
Therefore, PK value need not be multiplied by temperature coefficient and converts.
Owing to test is to carry out outside fuel tank, leakage magnetic flux does not enters into oil tank wall, but is directly entered folder and causes stray loss.In order to measure leakage magnetic flux loss value in folder, after we remove upper clamping piece, use 25%IHCurrent value measures the load loss value of every phase, obtains and the difference of load loss value when not removing folder, and calculates after folder from top to bottom all removes, and conversion is to 100%IHLoss during electric current.Consider that lower clamping piece is near away from winding away from ratio of winding upper clamping piece, it is assumed that the stray-load loss bigger than the loss value of upper clamping piece 20% of lower clamping piece, so multiplying factor 2.2.
In order to reduce added losses, low-voltage coil takes the measure eliminating circulation, substantially eliminates circulation.And place magnetic conductor at end turn, make leakage magnetic flux not enter folder.Contrast test has been done, at 25%I by B phaseHThe load loss value recorded during electric current, conversion to 100%IHThreephase load loss value during electric current:
From the experiment above it can be clearly seen that the value of load loss PK reduces 22.4%, lower by 5.2% than standard value [(279-264.4)/279].
Due at 25%IHDuring electric current, electric current density is low, square being inversely proportional to of the eddy-current loss value of coil and electric current density；The resistance loss when resistance loss of winding is less than 75 DEG C when 35 DEG C, the two compensates mutually.25%I when this is probably 35 DEG CHCurrent measurement load loss and 100%I when 75 DEG CHThe reason that current measurement load loss is equal.
High-impedance electric power transformer of the present invention is used to eliminate in winding after the method for circulation, the circulation having the beneficial effect that in energy eliminating transformer coil of generation, reduces the load loss of transformator and the pasta temperature rise of transformator and coil temperature rise.The present invention has simple in construction, arranges the advantages such as reasonable, cost of manufacture is low.
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described.Skilled person will appreciate that of the industry; the present invention is not restricted to the described embodiments; the principle that the present invention is simply described described in above-described embodiment and description; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements both fall within scope of the claimed invention.Claimed scope is defined by appending claims and equivalent thereof.
Claims (1)
1. the method for circulation during high-impedance electric power transformer eliminates winding, it is characterised in that it comprises following step
Rapid:
(1), low-voltage coil is designed to first wire the 1, second wire 2, privates 3 three of the wires also
The continuous winding of connection coiling, when low-voltage coil lead-out wire, every phase three of the wires is separately installed with the
One Current Transmit the 1, second Current Transmit the 2, the 3rd Current Transmit 3；And by second
Current Transmit 2 overturns 180 °；
(2), the Same Name of Ends of the first Current Transmit the 1, the 3rd Current Transmit 3 is linked up,
With the Same Name of Ends reversal connection of the second Current Transmit 2, it is connected into a bit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610240789.7A CN105957700A (en) | 2016-04-13 | 2016-04-13 | Method for eliminating circulation in winding of high impedance power transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610240789.7A CN105957700A (en) | 2016-04-13 | 2016-04-13 | Method for eliminating circulation in winding of high impedance power transformer |
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| Publication Number | Publication Date |
|---|---|
| CN105957700A true CN105957700A (en) | 2016-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610240789.7A Pending CN105957700A (en) | 2016-04-13 | 2016-04-13 | Method for eliminating circulation in winding of high impedance power transformer |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070080771A1 (en) * | 2001-03-08 | 2007-04-12 | Odell Arthur B | Method and apparatus for substantially reducing electrical earth displacement current flow generated by wound components |
| CN102629512A (en) * | 2012-01-17 | 2012-08-08 | 中国科学院等离子体物理研究所 | Delta connection structure for secondary side of high-current pulse short-circuit dry type transformer |
| CN102903486A (en) * | 2012-09-11 | 2013-01-30 | 江苏精海变压器有限公司 | Power transformer |
-
2016
- 2016-04-13 CN CN201610240789.7A patent/CN105957700A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070080771A1 (en) * | 2001-03-08 | 2007-04-12 | Odell Arthur B | Method and apparatus for substantially reducing electrical earth displacement current flow generated by wound components |
| CN102629512A (en) * | 2012-01-17 | 2012-08-08 | 中国科学院等离子体物理研究所 | Delta connection structure for secondary side of high-current pulse short-circuit dry type transformer |
| CN102903486A (en) * | 2012-09-11 | 2013-01-30 | 江苏精海变压器有限公司 | Power transformer |
Non-Patent Citations (1)
| Title |
|---|
| 夏光炬等: "消除变压器绕组中环流的一种方法", 《变压器》 * |
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Application publication date: 20160921 |