CN107782971A - A kind of online reactance measurement device for being adaptive to 2 windings and 3 windings - Google Patents
A kind of online reactance measurement device for being adaptive to 2 windings and 3 windings Download PDFInfo
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- CN107782971A CN107782971A CN201610749067.4A CN201610749067A CN107782971A CN 107782971 A CN107782971 A CN 107782971A CN 201610749067 A CN201610749067 A CN 201610749067A CN 107782971 A CN107782971 A CN 107782971A
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- 238000004804 winding Methods 0.000 title claims abstract description 64
- 238000005259 measurement Methods 0.000 title claims abstract description 15
- 230000003044 adaptive effect Effects 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000000205 computational method Methods 0.000 claims abstract 2
- 238000005070 sampling Methods 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims 1
- 230000009897 systematic effect Effects 0.000 claims 1
- 230000005284 excitation Effects 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000006854 communication Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of online reactance measurement device for being adaptive to 2 windings and 3 windings.Transformer Winding reactance measurement at present is by off-line method, calculates reactance indirectly.This mode can not realize on-line measurement, and usage is complicated, and efficiency is very low.Other this method does not account for influence of the parameters such as voltage in actual motion, frequency, load imbalance, excitation, insulating properties to reactance.Reactance value has direct relation with Transformer Winding physical arrangement, passes through the reactance value of acquisition, the running status of accurate assurance current transformer winding.The present invention considers operating various factors and offline environment comprehensively, proposes a kind of new computational methods.This method can take into account online and offline operating mode, influence of the other factors to calculated value in analysis operation.Experiment proves that the device can calculate reactance value under various operating modes.Device can find 110KV and above Transformer Winding running status in time, avoid equipment from running in spite of illness, ensure power department safety in production.
Description
Technical field
Patent of the present invention belongs to status of electric power detection field, and in particular to to 110KV and above
Transformer Winding reactance On-line Measuring Method in Transformer Winding operation.
Background technology
The winding state of Transformer is monitored at present, lacks a kind of detection method of mature and reliable.It is simultaneously different
Producer's transformer has very big difference in structure, number of windings, iron core and winding layout's relation, material, technique etc..Even
It is that there is also very big difference for the different series of same producer.By retrieval, the country is it has not been found that be specifically used to measurement not
With structure and the detection method or equipment of the online reactance value of type Transformer Winding, let alone possesses the stabilization for putting into market
Reliable detecting system.
With in line technology personnel's communication process of southern net and state's net, they mention, due to currently without special
Winding state Online Transaction Processing, winding state can not be held in real time, can only do detection afterwards or regularly FRA is detected.To day
Often work brings very big inconvenience.The running status of winding is grasped in real time, is accomplished to prevent early, is avoided accident.
The content of the invention
By the invention it is possible to very convenient realize realizes the online of winding reactance to the transformer of various structures, type
Measurement and calculating, thoroughly solve the problems, such as to be unable to on-line checking winding running status at present.
In actual measurement process, system obtains electric current, voltage signal, passes through Fu from PT, the input of CT protection devices
In leaf Fast transforms, obtain the electric current of sampled signal, the amplitude of voltage and angle, number of windings that system inputs according to user and
Nameplate parameter, selects different calculation formula, calculates the online reactance value of transformer respectively.Obtaining PT, CT electric currents, magnitude of voltage
During, it is necessary to synchronize operation to sample time.Synchronized sampling should be carried out according to the following steps：Synchronized sampling refers to adopt
Sample cycle and signal period（Primitive period）It should keep synchronous.There are following 3 points requirements：1. in order to carry out accurate Fu to signal
In leaf transformation, it is desirable to a signal period includes the integer sampling period.2. for using FFT（Fast Fourier Transform (FFT)）Point
For analyzer, also require that a signal period includes for 2 n times power sampling period.3. each passage participates in Fourier transformation
Data should correspond to the integer signal period, and the starting point of data is identical with end point.
For first point of requirement, it is far smaller than the signal period when the sampling period, that is, sample frequency is significantly larger than signal
During frequency, the influence of integral multiple can be ignored.
For second point requirement, according to FFT, in order to keep 2 n times power times, sample frequency must be according to fundamental wave
Frequency is changed, and should accurately know fundamental frequency before sampling.This point, it is practically impossible, therefore, uses
The analyzer of FFT, the sample frequency that actually should take a upper signal period are applied to next signal week
Phase.
For thirdly requiring, the actually namely select permeability of synchronisation source.For same system, such as one
Three-phase or polyphase machine, it is identical during the fundamental frequency of voltage and current, therefore, only it is to be understood that a certain voltage or electric current lead to
The fundamental frequency in road, and other voltages or current channel are using the passage as reference.
After sampling terminates, system selects corresponding calculation formula according to parameter setting.
Brief description of the drawings
Fig. 1 is double winding and the three-winding mode of connection.In three winding, there is intermediate voltage terminal.It is all inlet wire to gather signal
PT, CT input signals.
According to Fig. 1, whenever have：
（1）
The terminal voltage of --- ----transformer primary side；
Reduction value of --- ----secondary side terminal voltage in primary side；
--- ----transformer primary side current；
Reduction value of --- ----secondary side current in primary side；
R1, X1--- --- --- --- --- is respectively resistance and the reactance of primary side；
R12, X12--- --- --- --- be respectively secondary side resistance and reactance primary side reduction value；
Obviously, there are four unknown number R in (1) formula1, X1, R12, X12, without unique solution, formula can be rewritten into following form,
（2）
And make
（3）
It can then be obtained for any two different load
（4）
In formula,,,Respectively previous and later moment in timeReal part,
Imaginary part；,,,It is respectively previous and later moment in timeReal part, imaginary part.Solution above formula obtains：
（5）
（6）
In formula
（7）
Therefore short-circuit reactance Xsh=X1,+X12 。
Fig. 2 is three-winding transformer equivalent circuit diagram and basic parameter.
The distribution in three-winding transformer magnetic field is more complicated, has by three magnetomotive force、、Along iron core caused by joint
The mutual flux or main flux for closing and being interlinked simultaneously with three windings；Have only interlinked with a winding and with other two windings
The self-induction leakage magnetic flux for the main each winding along nonferromagnetic material closure not interlinked；Also only interlinked with two windings and not with
The main mutual inductance leakage magnetic flux closed along nonferromagnetic material of three winding interlinkages.Therefore, electromotive force equation is obtained in order to easier
Formula, using the method for termination power, differential equation is listed using the mutual inductance of the self-induction and two windings of each winding.Now, no matter
Self-induction and mutual inductance are all corresponding with whole magnetic fluxs of each winding interlinkage, without main flux and leakage magnetic flux are separated.
According to circuital law, magnetomotive force equation during three-winding transformer load running：
（8）
I.e.（9）
After ignoring exciting current, obtain（10）
Make L11、L22、L33For the self-induction of each winding；M12=M21、M13=M31、M32=M23For the mutual inductance between two windings, can then obtain
Electromotive force equation formula is
（11）
Above formula is that the instantaneous value of electromotive force equation formula represents.Under steady state conditions, it is electronic with the three-winding transformer of complex representation
Potential equation formula is
（12）
Above formula is substituted into corresponding reactance, can be obtained
（13）
By formula（13）In the first formula formula that subtracts the second, and from formula（10）WithSubstitute into, then subtract the with the first formula
Two formulas, and from formula（10）WithSubstitute into, can obtain
（14）
（15）
I.e.
（16）
Wherein,
（17）
In formula,、、For the equivalent reactance of each winding, they are constant：、、For the equivalent of each winding
Impedance,、、。
Fig. 3 is data Collection ＆ Processing System structured flowchart.
Fig. 4 is LPF figure.
Fig. 5 is frequency multiplier circuit figure.
Fig. 6 is transformer winding state on-line monitoring system structured flowchart.
FPGA is mainly responsible for the time series stereodata of A/D chip and provides work clock, 3 analog-to-digital conversions for each module
Including chip is orderly under FPGA control to carry out data acquisition to external signal, while the data collected are stored in by FPGA
In the FIFO that portion opens up.And DSP is mainly responsible for being read out the data collected from FIFO, while carry out at related data
Reason, and then various winding state evaluation algorithms are achieved, DSP also carries the task to upper machine communication in addition.FPGA
It is the soul of whole system with DSP, they are responsible for the data acquisition and procession of whole system, therefore the selection to them is related to
The performance of whole system.
Embodiment
In specific implementation process, the earth signal of all sampling sensors is connected to the ground of board, board needs in itself
To be connected with cabinet, so as to be grounded.Acquisition system needs DC24V constant-current sources, avoids interference of the harmonic signal to circuit as far as possible.Adopt
Collection board needs to carry out various isolation and lightning protection processing, avoids unnecessary damage.
Claims (5)
- A kind of 1. online reactance measurement device for being adaptive to 2 windings and 3 windings, it is characterised in that：Including being engraved according to transformer Board parameter, it is configured to 2 windings or 3 windings；According to PT precision, CT precision, compensation precision is set automatically；Automatic computing system is final Adjusting parameter, calculate online reactance value.
- 2. the online reactance measurement device according to claim 1 for being adaptive to 2 windings and 3 windings, it is characterized in that, it is described The number of windings automatically configures module and specifically included：2 windings, 3 winding Auto-matching functions：Because the structure of transformer is different, there is 2 Winding transformer, also there are 3 winding transformers, the transformer of the different numbers of windings, its reactance computational methods and formula are different, Yong Hu Configuration interface, number of windings is inputted, determines reactance calculation formula and method.
- 3. the online reactance measurement device according to claim 1 for being adaptive to 2 windings and 3 windings, it is characterized in that, it is described Precision automatic compensation module specifically includes：In actual applications, the PT of different user, CT measurement accuracy are different, and this can direct shadow Sampling and the computational accuracy of reactance below are rung, system in compensation circuit is sampled, fills according to different sampling precisions according to PT, CT Different accuracy grade is put, acquires different compensation deals methods.
- 4. the online reactance measurement device according to claim 1 for being adaptive to 2 windings and 3 windings, it is characterized in that, it is described System call interception parameter configuration module specifically includes：Zero load, load parameter in the nameplate parameter inputted according to user, short-circuit impedance Value, system calculate some current operational factors, including power factor (PF), 3 mutually unbalanced, cooling oil temperature etc. by automatic, calculated Some current compensating parameters, these parameters have also assisted in the calculating process of Transformer Winding reactance value, have certain weight because Son.
- 5. the online reactance measurement device according to claim 1 for being adaptive to 2 windings and 3 windings, it is characterised in that bag Include following steps：(1) measurement apparatus initialization interface is started, user inputs nameplate parameter；(2) by with third party's protection device Data acquisition channel is opened；(3) after confirming, systematic parameter is preserved, system is carrying out various calculating from the background.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610749067.4A CN107782971A (en) | 2016-08-29 | 2016-08-29 | A kind of online reactance measurement device for being adaptive to 2 windings and 3 windings |
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| CN201610749067.4A CN107782971A (en) | 2016-08-29 | 2016-08-29 | A kind of online reactance measurement device for being adaptive to 2 windings and 3 windings |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501608A (en) * | 2016-10-14 | 2017-03-15 | 国网福建省电力有限公司 | Error compensation and harmonic elimination device during a kind of reactance measurement |
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|---|---|---|---|---|
| CN201007733Y (en) * | 2007-02-15 | 2008-01-16 | 西安天城电力仪器设备有限责任公司 | Transformer winding deformation detection determining device |
| JP2008205450A (en) * | 2007-01-23 | 2008-09-04 | Tokyo Electric Power Co Inc:The | Equipment constant estimation system and program for estimating equipment constant for transformer |
| CN101261297A (en) * | 2008-04-17 | 2008-09-10 | 沈阳工业大学 | Electric power transformer windings parameter on-line real-time identification device and method |
| RU2364876C1 (en) * | 2008-05-19 | 2009-08-20 | Государственное образовательное учреждение высшего профессионального образования Томский политехнический университет | Method to determine parametres of three-phase three-winding transformer equivalent t-circuit in operating conditions |
| CN102902892A (en) * | 2012-10-22 | 2013-01-30 | 中冶南方工程技术有限公司 | Method for simplifying mathematical model of transformer in power supply system |
| CN104166768A (en) * | 2014-08-18 | 2014-11-26 | 国家电网公司 | Method for converting transformer nameplate parameters to power flow data parameters |
-
2016
- 2016-08-29 CN CN201610749067.4A patent/CN107782971A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008205450A (en) * | 2007-01-23 | 2008-09-04 | Tokyo Electric Power Co Inc:The | Equipment constant estimation system and program for estimating equipment constant for transformer |
| CN201007733Y (en) * | 2007-02-15 | 2008-01-16 | 西安天城电力仪器设备有限责任公司 | Transformer winding deformation detection determining device |
| CN101261297A (en) * | 2008-04-17 | 2008-09-10 | 沈阳工业大学 | Electric power transformer windings parameter on-line real-time identification device and method |
| RU2364876C1 (en) * | 2008-05-19 | 2009-08-20 | Государственное образовательное учреждение высшего профессионального образования Томский политехнический университет | Method to determine parametres of three-phase three-winding transformer equivalent t-circuit in operating conditions |
| CN102902892A (en) * | 2012-10-22 | 2013-01-30 | 中冶南方工程技术有限公司 | Method for simplifying mathematical model of transformer in power supply system |
| CN104166768A (en) * | 2014-08-18 | 2014-11-26 | 国家电网公司 | Method for converting transformer nameplate parameters to power flow data parameters |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501608A (en) * | 2016-10-14 | 2017-03-15 | 国网福建省电力有限公司 | Error compensation and harmonic elimination device during a kind of reactance measurement |
| CN106501608B (en) * | 2016-10-14 | 2019-02-22 | 国网福建省电力有限公司 | Error compensation and harmonic elimination device during a kind of reactance measurement |
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