CN102749515A - Measuring method for leakage reactance of transformer winding - Google Patents
Measuring method for leakage reactance of transformer winding Download PDFInfo
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- CN102749515A CN102749515A CN2012102068279A CN201210206827A CN102749515A CN 102749515 A CN102749515 A CN 102749515A CN 2012102068279 A CN2012102068279 A CN 2012102068279A CN 201210206827 A CN201210206827 A CN 201210206827A CN 102749515 A CN102749515 A CN 102749515A
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- transformer
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- voltage
- leakage reactance
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Abstract
The invention relates to a measuring method for leakage reactance of a transformer winding. The measuring method is characterized by comprising the following steps of: short-circuiting a transformer high-voltage winding when the leakage reactance of the winding is measured in the transformer short-circuiting test, and applying a possible low alternating current voltage to a transformer low-voltage winding; and measuring the voltage, electric current, active power or power factor of the transformer low-voltage winding, calculating the total leakage reactance x=x1+x2' of a transformer high-low pressure winding, and estimating the approximate value of x1, x2' or x2 according to the x.
Description
Affiliated technical field
The present invention relates to a kind of Transformer Winding leakage reactance measuring method, especially low-voltage is added in the method that the transformer low voltage winding is measured first and second winding leakage reactance.
Background technology
At present; Known transformer first and second winding leakage reactance short circuit measuring method generally is with the transformer low voltage short circuit in winding; Adding alternating voltage at transformer high-voltage winding two ends makes the low pressure winding current reach ratings; Measuring transformer high pressure winding voltage, electric current, active power are calculated the total leakage reactance x=x of high-low pressure winding
1+ x
2', estimate x according to x
1, x
2' or x
2Approximate value.
Short-circuit test measuring transformer x
1With x
2' sum is with the excitatory impedance (r in the transformer T type equivalent electrical circuit
m 2+ x
m 2)
1/2Get and be ∞, get like this and have certain error, (r
m 2+ x
m 2)
1/2More little error is big more.
In the type of transformer T shown in the Figure of description 1 equivalent electrical circuit, r
1, x
1, r
2', x
2' all be constant, if r
m+ jx
mAlso constant, I then
m(r
m 2+ x
m 2)
1/2With V
1Proportional.According to I
m(r
m 2+ x
m 2)
1/2Meaning, I
m(r
m 2+ x
m 2)
1/2Proportional with the intracardiac magnetic flux amplitude of transformer fe.Outside transformer core, adorn the 3rd and measure winding N
3, unshakable in one's determination in the magnetic flux amplitude also with measure winding open-circuit voltage V
3Proportional.So when changing alternating voltage V
1The time, measure V
3/ V
1Just know I
m(r
m 2+ x
m 2)
1/2How with V
1Change.Transformer metering circuit such as Figure of description 2.V in measurement data such as the table 1, table 1
1, V
3Unit all be mV.
Table 1
| V 1 | V 3 | V 3/V 1 | V 1 | V 3 | V 3/V 1 |
| 29 | 5 | 0.173 | 2025 | 238 | 0.118 |
| 55 | 8 | 0.145 | 4050 | 474 | 0.117 |
| 163 | 21 | 0.131 | 8050 | 945 | 0.117 |
| 320 | 39 | 0.121 | 12130 | 1430 | 0.118 |
| 1000 | 118 | 0.118 | 12230 | 1448 | 0.118 |
Visible from table 1, V
1More little V
3/ V
1Big more, i.e. V
1More little I
m(r
m 2+ x
m 2)
1/2/ V
1Big more, so transformer short-circuit should make V when testing
1As far as possible little.
If transformer high-low pressure winding voltage is than being K, low pressure winding impedance z
2Converting the high-pressure side is z
2'=K
2z
2, high pressure winding impedance z
1Converting low-pressure side is z
1'=z
1/ K
2, general z
1/ K
2<k
2z
2, because of z
1' or z
2' and excitatory impedance z
mParallel connection, z
1' or z
2' and excitatory impedance z
mDiffer many more, with excitatory impedance z
mGet and be ∞ to produce error more little, so generally should the transformer high-voltage short circuit in winding be added alternating voltage at the transformer low voltage winding when doing the transformer short-circuit test.
Summary of the invention
According to table 1 experimental result and above-mentioned analysis, adopt the low alternating voltage of trying one's best when doing transformer short-circuit experimental measurement winding leakage reactance; With the transformer high-voltage short circuit in winding, add alternating voltage at the transformer low voltage winding.
The technical solution adopted for the present invention to solve the technical problems
With the transformer high-voltage short circuit in winding, add the low alternating voltage of trying one's best when doing transformer short-circuit experimental measurement winding leakage reactance at the transformer low voltage winding; Measuring transformer low pressure winding voltage, electric current, active power or power factor, the total leakage reactance x=x of calculating transformer high-low pressure winding
1+ x
2', estimate x according to x
1, x
2' or x
2Approximate value.
Beneficial effect of the present invention
Can improve transformer high-low pressure winding leakage reactance measuring accuracy.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is a measuring transformer winding leakage reactance T type equivalent circuit diagram of the present invention;
Fig. 2 is a proof measuring method circuit diagram of the present invention.
In Fig. 1,1. transformer low voltage winding resistance, 2. transformer low voltage winding leakage reactance, 3. transformer high-voltage winding resistance, 4. transformer high-voltage winding leakage reactance, the 5. excitatory resistance of transformer core, the 6. excitatory reactance of transformer core, 7. AC low-tension voltage.
In Fig. 2,1. transformer low voltage winding, 2. transformer high-voltage winding, 3. transformer is measured winding, 4. AC low-tension voltage.
Embodiment
In Fig. 1, with the transformer high-voltage short circuit in winding, add AC low-tension voltage (7) at transformer low voltage winding two ends, measure the total leakage reactance x=x of calculating transformer high-low pressure winding according to the transformer short-circuit computing method
1+ x
2', estimate x according to x
1, x
2' or x
2Approximate value.
In Fig. 2, outside transformer core, adorn and measure winding (3), measure winding (3) two ends dress voltage table V
3, low pressure winding (1) two ends dress voltage table V
1With transformer high-voltage winding (2) short circuit; Add AC low-tension voltage (4) at transformer low voltage winding (1) two ends, change AC low-tension voltage (4), each AC low-tension voltage (4) is measured V
1And V
3, get final product table 1 measurement data.
Claims (1)
1. a Transformer Winding leakage reactance measuring method is characterized in that: with the transformer high-voltage short circuit in winding, add the low alternating voltage of trying one's best at the transformer low voltage winding when doing transformer short-circuit experimental measurement winding leakage reactance; Measuring transformer low pressure winding voltage, electric current, active power or power factor, the total leakage reactance x=x of calculating transformer high-low pressure winding
1+ x
2', estimate x according to x
1, x
2' or x
2Approximate value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102068279A CN102749515A (en) | 2012-06-21 | 2012-06-21 | Measuring method for leakage reactance of transformer winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102068279A CN102749515A (en) | 2012-06-21 | 2012-06-21 | Measuring method for leakage reactance of transformer winding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102749515A true CN102749515A (en) | 2012-10-24 |
Family
ID=47029868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102068279A Pending CN102749515A (en) | 2012-06-21 | 2012-06-21 | Measuring method for leakage reactance of transformer winding |
Country Status (1)
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|---|---|
| CN (1) | CN102749515A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316808A (en) * | 2014-11-17 | 2015-01-28 | 国家电网公司 | Method and system for detecting fault of transformer winding |
| CN105425045A (en) * | 2015-12-08 | 2016-03-23 | 云南电力试验研究院(集团)有限公司 | Ferromagnetic element leakage reactance measuring method based on simplified model |
| CN105425041A (en) * | 2015-09-21 | 2016-03-23 | 国家电网公司 | Calculating method of impedance value of three-winding transformer based on short circuit current restraint |
| WO2016124443A1 (en) * | 2015-02-06 | 2016-08-11 | Omicron Electronics Gmbh | Device and method for determining a parameter of a transformer |
| CN105939011A (en) * | 2016-03-22 | 2016-09-14 | 江苏省电力公司电力经济技术研究院 | Optimization method of impedance values of three-winding transformer of substation |
-
2012
- 2012-06-21 CN CN2012102068279A patent/CN102749515A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316808A (en) * | 2014-11-17 | 2015-01-28 | 国家电网公司 | Method and system for detecting fault of transformer winding |
| CN107407706A (en) * | 2015-02-06 | 2017-11-28 | 欧米克朗电子有限公司 | Transformer parameter determines apparatus and method |
| WO2016124443A1 (en) * | 2015-02-06 | 2016-08-11 | Omicron Electronics Gmbh | Device and method for determining a parameter of a transformer |
| KR20170113572A (en) * | 2015-02-06 | 2017-10-12 | 오미크론 일렉트로닉스 게엠바하 | Device and method for determining parameters of a transformer |
| KR101952215B1 (en) | 2015-02-06 | 2019-02-26 | 오미크론 일렉트로닉스 게엠바하 | Device and method for determining parameters of a transformer |
| CN107407706B (en) * | 2015-02-06 | 2019-11-08 | 欧米克朗电子有限公司 | Transformer parameter measurement device and method |
| US10794964B2 (en) | 2015-02-06 | 2020-10-06 | Omicron Electronics Gmbh | Device and method for determining a parameter of a transformer |
| CN105425041A (en) * | 2015-09-21 | 2016-03-23 | 国家电网公司 | Calculating method of impedance value of three-winding transformer based on short circuit current restraint |
| CN105425041B (en) * | 2015-09-21 | 2019-02-15 | 国家电网公司 | The calculation method of three-winding transformer impedance value based on short circuit current constraint |
| CN105425045A (en) * | 2015-12-08 | 2016-03-23 | 云南电力试验研究院(集团)有限公司 | Ferromagnetic element leakage reactance measuring method based on simplified model |
| CN105425045B (en) * | 2015-12-08 | 2018-06-15 | 云南电力试验研究院(集团)有限公司 | A kind of ferromagnetic element leakage reactance measuring method based on simplified model |
| CN105939011A (en) * | 2016-03-22 | 2016-09-14 | 江苏省电力公司电力经济技术研究院 | Optimization method of impedance values of three-winding transformer of substation |
| CN105939011B (en) * | 2016-03-22 | 2018-10-26 | 江苏省电力公司电力经济技术研究院 | A kind of optimization method of substation's three-winding transformer impedance value |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121024 |