CN106018961A - Three-phase transformer phase testing method - Google Patents
Three-phase transformer phase testing method Download PDFInfo
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- CN106018961A CN106018961A CN201610321553.6A CN201610321553A CN106018961A CN 106018961 A CN106018961 A CN 106018961A CN 201610321553 A CN201610321553 A CN 201610321553A CN 106018961 A CN106018961 A CN 106018961A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a three-phase transformer phase testing method comprising the following steps of: connecting the primary terminal A to the secondary terminal a of a test sample and inputting three-phase power to test 4 voltages including UAB, Uab, UBb, and UBc, computing the angle Bab by using a cosine law, and acquiring a phase number by a lookup program in combination with a relation between the UBb and the UBc. Compared with a conventional double voltage method, the method greatly reduces the number of measuring parameters and the number of computing times, increases testing efficiency, and may obtain the transformer group number by one time of trigonometric function operation.
Description
Technical field
The present invention relates to transformer technology field, in particular a kind of three-phase transformer phase test
Method.
Background technology
Three-phase transformer phase place is a highly important electric parameter, and it directly affects the exhausted of transformator
The characteristic of the aspects such as edge level, cost machine, rectification phase shift；How the phase place of transformator is carried out
Conveniently measuring is staff's focus of attention in field transformer.
Existing measuring transformer joint group method for distinguishing has: direct current method, twin voltage table method, turn ratio instrument
Method, oscilloscope method etc., for measuring common three-phase transformer (YDZ any combination, 1-12 integer
Point) to apply most be twin voltage table method.Twin voltage table method of the prior art sees Liaoning science skill
" transformer experiment technology is complete works of " Section of three alternating current method of chapter 4 that art publishing house publishes, needs respectively
Measure 5 voltages: UAB, UBb, UBc, UCc, UCb, and calculate 7 algebraic expression: M,
N, P, Q, R, L, T, again by tabling look-up, after need to looking into 3 parameters, just after drawing result of calculation
The Connection series number of tested transformator can be drawn.In actual measurement, owing to twin voltage table method needs to measure
Parameter more, calculate loaded down with trivial details, therefore, utilize the designed transformer voltage ratio group produced of the method
Tester time required when reality is measured is generally higher than 20S, and testing efficiency is relatively low；Further,
If test site does not has test instrunment, if use manual measurement and calculate, can the most loaded down with trivial details and
Mistake easily occurs.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
It is an object of the invention to provide a kind of three-phase transformer phase test method, it is intended to solve existing
Parameter is more, calculate loaded down with trivial details, inefficiency etc. in three-phase transformer phase test method measurement in technology
Technical problem.
Technical scheme is as follows: a kind of three-phase transformer phase test method, including following step
Rapid:
The primary terminals of the most tested three-phase transformer is respectively A end, B end and C end, and secondary terminal divides
Not Wei a end, b end and c end, first connect primary terminals A and secondary terminal a, then by tested three phase transformations
The primary terminals of depressor is connected with three outfans of three-phase symmetrical power respectively；
B. 4 voltages are measured respectively with voltmeter: the voltage U at primary terminals A and B two endsAB, secondary
Level terminal a and the voltage U at b two endsab, primary terminals B and the voltage U at secondary terminal b two endsBbWith
And primary terminals B and the U at secondary terminal c two endsBc, draw the vectogram of each voltage；
C. utilizing the cosine law to calculate ∠ Bab, computing formula is:
Cos ∠ Bab=(UAB 2+Uab 2-UBb 2)/(2*UAB*Uab),
D. according to the result of calculation ∠ Bab in step C, with reference to phasor diagram, and voltage U is combinedBb、UBc
Magnitude relationship, by each data summarization in following table, then inquires about following table, draws tested three-phase transformer phase
Hyte alias, described phase determination relation see table as follows:
Described three-phase transformer phase test method, wherein, described tested three-phase transformer is three-phase
Isolating transformer, the bind mode of tested three-phase transformer is the arbitrary connection in Y, D, Z and combination.
Described three-phase transformer phase test method, wherein, the three-phase electricity of described three-phase symmetrical power
Pressing equal in magnitude, the phase contrast of three-phase voltage is 120 °.
Described three-phase transformer phase test method, wherein, in upper table, according to its phasor diagram and
Plane geometry knowledge can be readily available described " ≈ " or " ＞ " can be loosened to ± 5% scope.Institute
State " ∠ Bab " can choose to round in range of error ± 10 degree still there is engineering significance and not shadow
Ring reality to judge.
After described step C is tried to achieve the result of ∠ Bab, when result is not integral point number, round a little
Number, described integral point is appointing in 0 °, 30 °, 60 °, 90 °, 120 °, 150 ° and 180 °
Anticipate one.
Beneficial effects of the present invention
The present invention, by providing one three-phase transformer phase test method easily, uses institute of the present invention
Method of stating only need to be measured 4 voltages and calculates 1 angle and contrast the size of two voltages and can draw
The group number of three-phase transformer.Compare traditional twin voltage method, greatly reduce the number measuring parameter
And calculation times, it is effectively improved measurement efficiency, present invention only requires and do the computing of 1 trigonometric function i.e.
Transformer group alias can be drawn.
Detailed description of the invention
For making the purpose of the present invention, technical scheme and advantage clearer, clear and definite, referring to the drawings
The present invention is described in more detail for the embodiment that develops simultaneously.
Fig. 1 be Bab=30 ° of group number of ∠ be the loss diagram at 1 o'clock, Fig. 2 is Bab=30 ° of group of ∠
Number it is the loss diagram at 11 o'clock, from Fig. 1～Fig. 2 it can be seen that as ∠ Bab=30 °, transformator
Group number or be 1, or be 11, it is only necessary to contrast U againBcWith UBbSize, several according to plane
What knowledge is easy to draw: work as UBc＞ UBbTime group number be 1 o'clock, work as UBc≈UBbIt is then 11
Point；
Fig. 3 be Bab=60 ° of group number of ∠ be the loss diagram at 2 o'clock, Fig. 4 is Bab=60 ° of group of ∠
Number it is the loss diagram at 10 o'clock, from Fig. 3～Fig. 4 it can be seen that as ∠ Bab=60 °, transformator
Group number or be 2, or be 10, it is only necessary to contrast U againBcWith UBbSize, several according to plane
What knowledge is easy to draw: work as UBc＞ UBbTime group number be 2 o'clock, otherwise be then 10 points；
Fig. 5 be Bab=90 ° of group number of ∠ be the loss diagram at 3 o'clock, Fig. 6 is Bab=90 ° of group of ∠
Number it is the loss diagram at 9 o'clock, from Fig. 5～Fig. 6 it can be seen that as ∠ Bab=90 °, transformator
Group number or be 3, or be 9, it is only necessary to contrast U againBcWith UBbSize, several according to plane
What knowledge is easy to draw: work as UBc＞ UBbTime group number be 3 o'clock, otherwise be then 9 points；
Fig. 7 be Bab=120 ° of group number of ∠ be the loss diagram at 4 o'clock, Fig. 8 is Bab=120 ° of group of ∠
Alias is the loss diagram at 8 o'clock, from Fig. 7～Fig. 8 it can be seen that as ∠ Bab=120 °, and transformation
Device group number or be 4, or be 8, it is only necessary to contrast U againBcWith UBbSize, according to plane
Geometric knowledge is easy to draw: work as UBc＞ UBbTime group number be 4 o'clock, otherwise be then 8 points；
Fig. 9 be Bab=150 ° of group number of ∠ be the loss diagram at 5 o'clock, Figure 10 is ∠ Bab=150 °
Group number is the loss diagram at 7 o'clock, from Fig. 9～Figure 10 it can be seen that as ∠ Bab=150 °,
Transformer group alias or be 5, or be 7, it is only necessary to contrast U againBcWith UBbSize, according to
Plane geometry knowledge is easy to draw: work as UBc≈UBbTime group number be 5 o'clock, work as UBb＞ UBc
Shi Zewei 7 point；
Figure 11 be Bab=180 ° of group number of ∠ be the loss diagram at 6 o'clock, Figure 12 is Bab=0 ° of group of ∠
Alias is the loss diagram at 12 o'clock, due to the Practical Calculation error of ∠ Bab=180 ° or ∠ Bab=0 °
May be bigger than normal, Gu in conjunction with UBbWith UBcVoltage swing judges that group number can more accurate one together
A bit.
It is explained further below.
Technical scheme is as follows: a kind of three-phase transformer phase test method, including following step
Rapid:
The primary terminals of the most tested three-phase transformer is respectively A end, B end and C end, and secondary terminal divides
Not Wei a end, b end and c end, first connect primary terminals A and secondary terminal a, then by tested three phase transformations
The primary terminals of depressor is connected with three outfans of three-phase symmetrical power respectively；
B. 4 voltages are measured respectively with voltmeter: the voltage U at primary terminals A and B two endsAB, secondary
Level terminal a and the voltage U at b two endsab, primary terminals B and the voltage U at secondary terminal b two endsBbWith
And primary terminals B and the U at secondary terminal c two endsBc, draw the vectogram of each voltage；
C. utilizing the cosine law to calculate ∠ Bab, computing formula is:
Cos ∠ Bab=(UAB 2+Uab 2-UBb 2)/(2*UAB*Uab),
D. according to the result of calculation ∠ Bab in step C, with reference to phasor diagram, and voltage U is combinedBb、UBc
Magnitude relationship, by each data summarization in following table, then inquires about following table, draws tested three-phase transformer phase
Hyte alias, described phase determination relation see table as follows:
Described three-phase transformer phase test method, wherein, described tested three-phase transformer is three-phase
Isolating transformer, the bind mode of tested three-phase transformer is the arbitrary connection in Y, D, Z and combination.
Described three-phase transformer phase test method, wherein, the three-phase electricity of described three-phase symmetrical power
Pressing equal in magnitude, the phase contrast of three-phase voltage is 120 °.
Described three-phase transformer phase test method, wherein, in upper table, according to its phasor diagram and
Plane geometry knowledge can be readily available described " ≈ " or " ＞ " can be loosened to ± 5% scope.Institute
State " ∠ Bab " can choose to round in range of error ± 10 degree still there is engineering significance and not shadow
Ring reality to judge.
After described step C is tried to achieve the result of ∠ Bab, when result is not integral point number, round a little
Number, described integral point is appointing in 0 °, 30 °, 60 °, 90 °, 120 °, 150 ° and 180 °
Anticipate one.
Embodiment
Certain three-phase isolation transformer, predicts its phase place, it is only necessary to connect A-a, primary side input three-phase
Symmetrical voltage, measures 4 voltage: U with voltmeterAB、Uab、UBb、UBc, be respectively as follows: 200V,
100V, 124V, 224V, calculate process as follows:
Cos ∠ Bab=(UAB 2+Uab 2-UBb 2)/(2*UAB*Uab)=0.8656, obtains ∠ Bab=
30.05 °, round ∠ Bab=30 °；
UBc=224V, UBb=124V, due to 224V ＞ 124V, i.e. UBc＞ UBb。
By ∠ Bab=30 °, UBc＞ UBbTabling look-up and can obtaining transformer group alias was 1 o'clock.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, to ordinary skill
For personnel, can be improved according to the above description or convert, all these modifications and variations are all answered
Belong to the protection domain of claims of the present invention.
Claims (6)
1. a three-phase transformer phase test method, it is characterised in that comprise the following steps:
The primary terminals of the most tested three-phase transformer is respectively A end, B end and C end, and secondary terminal divides
Not Wei a end, b end and c end, first connect primary terminals A and secondary terminal a, then by tested three phase transformations
The primary terminals of depressor is connected with three outfans of three-phase symmetrical power respectively；
B. 4 voltages are measured respectively with voltmeter: the voltage U at primary terminals A and B two endsAB, secondary
Level terminal a and the voltage U at b two endsab, primary terminals B and the voltage U at secondary terminal b two endsBbWith
And primary terminals B and the U at secondary terminal c two endsBc, draw the vectogram of each voltage；
C. utilizing the cosine law to calculate ∠ Bab, computing formula is:
Cos ∠ Bab=(UAB 2+Uab 2-UBb 2)/(2*UAB*Uab),
D. according to the result of calculation ∠ Bab in step C, with reference to phasor diagram, and voltage U is combinedBb、UBc
Magnitude relationship, by each data summarization in following table, then inquires about following table, draws tested three-phase transformer phase
Hyte alias, described phase determination relation see table as follows:
A kind of three-phase transformer phase test method the most according to claim 1, it is characterised in that
Described tested three-phase transformer is three-phase isolation transformer, the bind mode of tested three-phase transformer be Y,
Arbitrary connection in D, Z and combination.
A kind of three-phase transformer phase test method the most according to claim 1, it is characterised in that
The three-phase voltage of described three-phase symmetrical power is equal in magnitude, and the phase contrast of three-phase voltage is 120 °.
A kind of three-phase transformer phase test method the most according to claim 1, it is characterised in that
Described " ≈ " or " ＞ " can be loosened to ± 5% scope.Described " ∠ Bab " can be to take in range of error
Whole, choose ± 10 degree still there is engineering significance and have no effect on actual judgement.
A kind of three-phase transformer phase test method the most according to claim 1, it is characterised in that
After described step C is tried to achieve the result of ∠ Bab, when result is not integral point number, rounds and count, institute
Stating integral point is any one in 0 °, 30 °, 60 °, 90 °, 120 °, 150 ° and 180 °.
A kind of three-phase transformer phase test method the most according to claim 1, it is characterised in that
Trigonometric function operation only needs 1 time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610321553.6A CN106018961A (en) | 2016-05-14 | 2016-05-14 | Three-phase transformer phase testing method |
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| CN201610321553.6A CN106018961A (en) | 2016-05-14 | 2016-05-14 | Three-phase transformer phase testing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982949A (en) * | 2018-05-29 | 2018-12-11 | 南京工程学院 | A method of based on line voltage, phase voltage acquiring size its phasor |
Citations (5)
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|---|---|---|---|---|
| US6397157B1 (en) * | 1999-07-02 | 2002-05-28 | General Electric Company | Method and apparatus for real time measurement of three phase electrical parameters |
| CN103235183A (en) * | 2013-04-17 | 2013-08-07 | 广东新昇电业科技股份有限公司 | Measurement and calculation method for three-phase transformer phases |
| CN103235231A (en) * | 2013-04-26 | 2013-08-07 | 广东新昇电业科技股份有限公司 | Circuit and method of bi-directionally testing phase of three-phase transformer |
| CN103713193A (en) * | 2010-05-20 | 2014-04-09 | 杨建堂 | Application meted for determining voltage phase and checking phase by using cosine law |
| CN105572531A (en) * | 2015-12-11 | 2016-05-11 | 天津二十冶建设有限公司 | Determination method for three-phase transformer bank polarity |
-
2016
- 2016-05-14 CN CN201610321553.6A patent/CN106018961A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6397157B1 (en) * | 1999-07-02 | 2002-05-28 | General Electric Company | Method and apparatus for real time measurement of three phase electrical parameters |
| CN103713193A (en) * | 2010-05-20 | 2014-04-09 | 杨建堂 | Application meted for determining voltage phase and checking phase by using cosine law |
| CN103235183A (en) * | 2013-04-17 | 2013-08-07 | 广东新昇电业科技股份有限公司 | Measurement and calculation method for three-phase transformer phases |
| CN103235231A (en) * | 2013-04-26 | 2013-08-07 | 广东新昇电业科技股份有限公司 | Circuit and method of bi-directionally testing phase of three-phase transformer |
| CN105572531A (en) * | 2015-12-11 | 2016-05-11 | 天津二十冶建设有限公司 | Determination method for three-phase transformer bank polarity |
Non-Patent Citations (1)
| Title |
|---|
| 曾惠芳等: ""三相变压器联接组号的实验判断法"", 《南方冶金学院学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982949A (en) * | 2018-05-29 | 2018-12-11 | 南京工程学院 | A method of based on line voltage, phase voltage acquiring size its phasor |
| CN108982949B (en) * | 2018-05-29 | 2020-12-22 | 南京工程学院 | Method for obtaining phasor of line voltage and phase voltage based on magnitude of line voltage and phase voltage |
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Application publication date: 20161012 |
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