CN104808051A - Large power transformer load loss verification method - Google Patents
Large power transformer load loss verification method Download PDFInfo
- Publication number
- CN104808051A CN104808051A CN201510126629.5A CN201510126629A CN104808051A CN 104808051 A CN104808051 A CN 104808051A CN 201510126629 A CN201510126629 A CN 201510126629A CN 104808051 A CN104808051 A CN 104808051A
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- China
- Prior art keywords
- loss
- transformer
- load loss
- verification method
- load
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- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000012795 verification Methods 0.000 title claims abstract description 14
- 238000004804 winding Methods 0.000 claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 239000010949 copper Substances 0.000 abstract 1
- 230000005284 excitation Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 230000002964 excitative effect Effects 0.000 description 2
- 238000007619 statistical method Methods 0.000 description 1
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- Protection Of Transformers (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention relates to a power transformer load loss verification method, particularly relates to a large power transformer load loss verification method, and solves a problem of lacking of the large power transformer load loss verification method at present. When rated current flows through transformer windings, winding resistance has copper loss. The resistance values of the windings of each side of the transformer are converted into values at temperature of 75 DEG C. Resistance loss of the high and medium voltage sides is PR=3R<high>I<1N><2>+3R<medium>I<2N><2>. The rated current has excitation so as to have magnetic hysteresis loss and eddy current loss. No-load loss P0 mainly reflects magnetic hysteresis loss and eddy current loss so that approximate calculation of load loss through the transformer substation onsite condition can be defined as PJ=PR+P0. With the concept of verification of approximate calculation of load loss through the technical parameters of 26 three-winding transformers of a 22kV transformer substation, the qualified approximate calculation of transformer load loss and nameplate load loss error is less than 5%, and the minimum error is less than 1%. Therefore, approximate calculation of load loss PJ=PR+P0 is completely true.
Description
Technical field
The present invention relates to the method for calibration of power transformer load loss, be specially the verification method of large-scale power transformer load loss.
Background technology
The load loss that large-scale power transformer nameplate marks load loss actual with it there are differences, and therefore, need verify before formal use in site of deployment to its load loss.GB50150 " electrical equipment commissioning test standard " does not have corresponding verification method, therefore, in working practice, lacks the verification of power transformer load loss or the verification method of specification.
Summary of the invention
The present invention solves the problem lacking large-scale power transformer load loss method of calibration at present, provides a kind of verification method of large-scale power transformer load loss.
The present invention adopts following technical scheme to realize: the verification method of large-scale power transformer load loss, is realized by following steps:
1) measuring transformer upper strata oil temperature t;
2) test the direct current resistance R of transformer each side winding, and be converted to the value of 75 DEG C, R
75=(235+75)/(235+t) × R;
3) calculating transformer winding is under rated current, and transformer high pressure side is converted to 75 DEG C of direct current resistance loss P
r=3R
highi
1N 2+ 3R
ini
2N 2, I
1Nfor high-pressure side rated current, I
2Nfor medium voltage side rated current;
4) calculating transformer winding is under rated current, and transformer high pressure side is similar to load loss P
j=P
r+ P
0, P
0for open circuit loss; Rated current has excitatory, therefore has magnetic hysteresis loss and eddy current loss equally, and open circuit loss P
0main reflection magnetic hysteresis loss and eddy current.Transformer high pressure side is similar to load loss P
j=P
r+ P
0compare with the load loss on nameplate, and realize the checking of load loss.
Transformer high, normal, basic each side volume ratio is 100/100/50, so we mainly study high pressure side winding loss.
By 26 three-winding transformer technical parameter checking approximate treatment load loss concepts to 220kV transformer station, qualified transformer approximate treatment load loss and nameplate load loss error are all below 5%, and least error is less than 1%.Therefore approximate treatment load loss P
j=P
r+ P
0set up completely.Specifically see
following table:
220kV: three winding has a year transformer technology Parameter statistical analysis
Embodiment
The verification method of large-scale power transformer load loss, is realized by following steps:
1) measuring transformer upper strata oil temperature t;
2) test the direct current resistance R of transformer each side winding, and be converted to the value of 75 DEG C, R
75=(235+75)/(235+t) × R;
3) calculating transformer winding is under rated current, and transformer high pressure side is converted to 75 DEG C of direct current resistance loss P
r=3R
highi
1N 2+ 3R
ini
2N 2, I
1Nfor high-pressure side rated current, I
2Nfor medium voltage side rated current;
4) calculating transformer winding is under rated current, and transformer high pressure side is similar to load loss P
j=P
r+ P
0, P
0for open circuit loss; Rated current has excitatory, therefore has magnetic hysteresis loss and eddy current loss equally, and open circuit loss P
0main reflection magnetic hysteresis loss and eddy current.Transformer high pressure side is similar to load loss P
j=P
r+ P
0compare with the load loss on nameplate, and realize the checking of load loss.
Claims (1)
1. a verification method for large-scale power transformer load loss, it is characterized in that being realized by following steps:
1) measuring transformer upper strata oil temperature t;
2) test the direct current resistance R of transformer each side winding, and be converted to the value of 75 DEG C, R
75=(235+75)/(235+t) × R;
3) calculating transformer winding is under rated current, and transformer high pressure side is converted to 75 DEG C of direct current resistance loss P
r=3R
highi
1N 2+ 3R
ini
2N 2, I
1Nfor high-pressure side rated current, I
2Nfor medium voltage side rated current;
4) calculating transformer winding is under rated current, and transformer high pressure side is similar to load loss P
j=P
r+ P
0, P
0for open circuit loss; Transformer high pressure side is similar to load loss P
j=P
r+ P
0compare with the load loss on nameplate, and realize the checking of load loss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510126629.5A CN104808051A (en) | 2015-03-23 | 2015-03-23 | Large power transformer load loss verification method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510126629.5A CN104808051A (en) | 2015-03-23 | 2015-03-23 | Large power transformer load loss verification method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104808051A true CN104808051A (en) | 2015-07-29 |
Family
ID=53693051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510126629.5A Pending CN104808051A (en) | 2015-03-23 | 2015-03-23 | Large power transformer load loss verification method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104808051A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546811A (en) * | 2016-11-02 | 2017-03-29 | 国家电网公司 | The detection method and system of transformer load loss under a kind of harmonic current |
| CN111474433A (en) * | 2020-04-26 | 2020-07-31 | 国网江西省电力有限公司电力科学研究院 | Distribution transformer rated capacity verification method convenient for field test |
| CN112417363A (en) * | 2020-11-11 | 2021-02-26 | 深圳供电局有限公司 | Load analysis method and system for transformer substation |
-
2015
- 2015-03-23 CN CN201510126629.5A patent/CN104808051A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546811A (en) * | 2016-11-02 | 2017-03-29 | 国家电网公司 | The detection method and system of transformer load loss under a kind of harmonic current |
| CN111474433A (en) * | 2020-04-26 | 2020-07-31 | 国网江西省电力有限公司电力科学研究院 | Distribution transformer rated capacity verification method convenient for field test |
| CN112417363A (en) * | 2020-11-11 | 2021-02-26 | 深圳供电局有限公司 | Load analysis method and system for transformer substation |
| CN112417363B (en) * | 2020-11-11 | 2022-06-24 | 深圳供电局有限公司 | Load analysis method and system for transformer substation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150729 |
|
| WD01 | Invention patent application deemed withdrawn after publication |