CN108318791A - Air reactor turn-to-turn insulation insulation fault method of discrimination based on frequency domain character analysis - Google Patents
Air reactor turn-to-turn insulation insulation fault method of discrimination based on frequency domain character analysis Download PDFInfo
- Publication number
- CN108318791A CN108318791A CN201810250302.2A CN201810250302A CN108318791A CN 108318791 A CN108318791 A CN 108318791A CN 201810250302 A CN201810250302 A CN 201810250302A CN 108318791 A CN108318791 A CN 108318791A
- Authority
- CN
- China
- Prior art keywords
- turn
- insulation
- air reactor
- failure
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Present invention employs the methods based on frequency-domain analysis to diagnose the turn-to-turn insulation failure of air reactor.Generally judge whether to break down using time domain waveform at present, it needs further relatively to shake period and attenuation coefficient, it is difficult to differentiate between normal waveform and fault waveform, method proposed by the present invention is more clear, is illustrated, air reactor turn-to-turn insulation can be directly given with the presence or absence of failure and the degree of failure.Achieved the purpose that it is accurate, easily judge turn-to-turn insulation failure, ensure the safe and stable operation of air reactor.
Description
Technical field
Fault Diagnosis for Electrical Equipment
Background technology
Currently, the detection method of reactor turn-to-turn insulation is mainly the following：(1) stray field detection method.This method profit
Stray field figure is measured with Hall sensor, iron core type winding inter-turn failure can be measured, and can determine whether out the position of short circuit appearance
It sets.But this method is only applicable to direct short-circuit failure, and stealthy turn-to-turn fault can not be detected.(2) higher-order of oscillation energy
Measure absorption process.The principle of this method can be produced when passing to the coil of high-frequency current close to the coil of a generation turn-to-turn short circuit
The absorbed phenomenon of raw energy, illustrates that there are turn-to-turn short circuits for the coil if energy is absorbed.But this method cost is higher.(3)
Lightning impulse test method.Traditional lightning impulse test is to the minor insulation of winding, i.e., turn-to-turn, interlayer, section insulation etc. is electrical
Intensity is examined.The time applied using lightning impulse voltage is shorter, so the effect of detection is barely satisfactory.(4) high frequency arteries and veins
Rush oscillating voltage method.Impulse-voltage method is to form oscillating circuit by switch and subject coil using the capacitor after charging,
Frequency of oscillation is the function of inductance and capacitance, selects determining charging capacitor that can determine the test frequency required by experiment
Range.The experiment applies high-frequency impulse oscillating voltage waveform under low voltage and full voltage using detection and comparison, to reactance
The turn-to-turn insulation situation of device is judged.This can generate higher test voltage, to be conducive to find inter-turn insulation defect.
Thus, impulse-voltage method is the common method detected in turn-to-turn insulation.
Impulse-voltage method utilizes applies half voltage and full voltage at reactor both ends, and high-frequency impulse shakes in the case of two kinds of comparison
Swing voltage waveform, with this come judge reactor whether there is inter-turn insulation defect.Its basic principle is as shown in Figure 1.
When experiment, by half-wave or the power supply of full-wave rectification to high-voltage pulse capacitor charging, when charging voltage reaches specified
It is required that when.Ball discharge gap is connected, and pulsed capacitance forms the damping oscillation circuit of certain frequency with experiment winding, and frequency of oscillation is
Discharge voltage is gradually decayed, and is not enough to pilot arc until decaying to, therefore arc extinction, after arc extinction, arteries and veins
It rushes capacitance to start to charge up again, be ready for next Secondary Shocks.By thousands of impacts, experiment winding is not burnt, and
Total head and half corrugating frequency are equal, then it is believed that winding is intact.
When carrying out turn to turn insulation test using impulse-voltage method, obtained is the time domain response waveform of voltage, such as Fig. 2
It is shown.
As shown in Figure 2, have no significant change feature whether there is or not the time domain waveform of turn-to-turn insulation failure, only from response voltage when
Turn-to-turn insulation failure can not be judged on domain waveform, need that waveform is further processed.Only further analyze time domain waveform
Cyclophysis and attenuation characteristic, by compare test product reactor under system nominal voltage and oscillation wave test voltage under both ends
Voltage or current waveform frequency and zero crossing variation, could infer air reactor coil with the presence or absence of turn-to-turn insulation failure.
Invention content
When judging turn-to-turn insulation failure for existing time domain waveform, waveform changes unconspicuous problem, and this patent is in original
On the basis of having hardware, the method for fault distinguishing is improved, proposes the air reactor circle analyzed based on frequency domain character
Between insulation fault method of discrimination.
In the data handling procedure that failure judgement whether there is, the time-domain analysis of conventional method easy tos produce amplitude and phase
The offset of position is unfavorable for judging the presence of inductor turn-to-turn fault so as to cause the deviation of comparison of wave shape effect.And work as hollow electricity
When anti-device turn-to-turn insulation failure, the short-circuited conducting sleeve that short trouble occurs will produce demagnetizing effect, by Theory of Electromagnetic Field it is found that coil exists
Induced electromotive force will be generated in alternating magnetic field, while reactor winding has whole the number of turns that short-circuit circle reduces winding, makes electricity
The equivalent inductance parameter of anti-device changes, and then frequency response is caused the variation of obvious characteristic occur.Original time domain wave
Shape carried out data fitting, obtains reactor both end voltage and changes with time function, carries out Fourier transformation to this function, obtains
To frequency spectrum function, analyzed in frequency domain.Detection based on frequency domain character analysis more can accurately failure judgement presence, make
As a result lower error is generated, to reach higher Stability and veracity.The present invention, which is proposed, to be compared based on frequency domain character
Air reactor turn-to-turn insulation fault detection method ensures that it is reliable accurately to find the turn-to-turn insulation failure of air reactor
Operation, improves the safety of operation of power networks.
The method of discrimination of the 1 air reactor turn-to-turn insulation failure based on frequency domain character：
(1) reactor turn-to-turn insulation is detected using pulse current method reactor turn to turn insulation test device, is obtained
The time domain waveform that voltage changes over time, such as formula (1)：
Wherein, ω1For actual oscillation frequency, ω0For natural mode shape, δ is attenuation coefficient.
δ=R/2L,β=arctan (ω1/ δ) it is initial phase angle.
ω1、ω0, each parameter value such as δ and β, can be obtained by the method for Matlab software curve matchings.
(2) Fourier transformation is carried out to the time domain formula of formula (1)：
The voltage at air reactor both ends is obtained with the functional relation of frequency, as shown in formula (2)：
Wherein, ω1For actual oscillation frequency, ω0For natural mode shape, δ is attenuation coefficient.(same to formula (1))
Frequency domain formula (2) is analyzed, the amplitude spectral function of frequency spectrum function can be obtained：Frequency domain amplitude
Shown in the amplitude spectral function of being calculated such as formula (3)：
In formula, ω1For actual oscillation frequency, ω0For natural mode shape.
β=arctan (ω1/ δ) it is initial phase angle.
According to the signature analysis of amplitude spectrum, the characteristic analysis method based on frequency domain can be obtained.
Representative value (by taking 35kV air reactors as an example) is taken to formula (3) each parameter：R=5 Ω；C=3nF；UcIt charges to
180kV；When L takes 60mH, 100mH and 140mH respectively, variation relation curve such as Fig. 3 institutes of the voltage magnitude U with frequencies omega is obtained
Show：Function shown in formula (3) be even function, so the amplitude spectrogram provided only with display [0 ,+∞) range.
As seen from Figure 3, the waveform of amplitude spectrum is simpler relative to time domain waveform, more according to the feature of amplitude spectrum waveform
Easily determine whether miscellaneous insulation of air reactor breaks down.
(3) criterion
Final distinguishing rule whether air reactor turn-to-turn insulation failure is that the variation range of its own inductance value is
It is no to exceed license.It needs to find out a threshold inductance value L ', as the equivalent inductance value L ＜ L' of air reactor, you can sentence
Disconnected air reactor turn-to-turn insulation failure.However, pulse current method judges that turn-to-turn insulation failure can not directly measure hollow reactance
The equivalent inductance value of device, whether needs according to wave character come failure judgement.
Judge that reactor turn-to-turn insulation whether there is the method for failure using mechanical periodicity rate and attenuation coefficient change rate
(time-domain criteria) can be obtained threshold inductance value L ' and be determined by following criterion：
1. mechanical periodicity rate≤5%
Pass through formulaFrequency is calculated, to obtain mechanical periodicity rate, and then calculates electricity when being out of order
Sense is faced
Dividing value, i.e.,：
Wherein
2. attenuation change rate≤10%
Pass through attenuation coefficient calculation formula：
The failure reactor critical value obtained from is：
By 1., 2. respectively obtain L1' and L2', take its higher value as threshold inductance value L '.
As seen from Figure 3, in the range of ω ∈ [0,1000], with the increase of L values, corresponding amplitude spectral curve is with frequency
Increase and increased rate faster, reaction on graphic feature be：Curve upwarps more obvious.I.e.：(1) turn-to-turn insulation occurs
The corresponding amplitude spectral curve of air reactor of failure is below the corresponding amplitude spectral curve of critical fault；(2) when amplitude is set a song to music
When line is located between critical fault and the corresponding amplitude spectral curve of normal value, it can sentence according to the degree for deviateing normalized curve
Disconnected air reactor turn-to-turn insulation state.
Thus, the air reactor turn-to-turn insulation corresponding to amplitude spectral curve can accurately, easily be judged according to this feature
Whether break down.
(4) the air reactor turn-to-turn insulation fault distinguishing method based on frequency domain character analysis：
To carry out dry-type air-core reactor turn-to-turn using the frequency domain spectrum of the corresponding reactor both end voltage of inductance value
Condition assessment of insulation.The criterion is roughly divided into two large divisions：Data calculating section and judge process part.Specifically judge flow such as
Under：
1) data calculating section：
(1) to the normal air reactor of turn-to-turn insulation, each parameter can be obtained in the time domain waveform detected using device
Value, and then the equivalent inductance value L of normal spatiotemporal core device is calculated；
(2) determining threshold inductance value L ' is obtained by formula (4) and (5)；
(3) parameter value chosen according to actual tests device to parameters such as resistance, capacitance and supply voltages, chooses respectively
L ' when L and critical fault when normal, substitutes into formula (3), be used in combination draw its [0 ,+∞) waveform in range, obtain normally
2 frequency curves with when critical fault, are denoted as curve R and R ' respectively.
2) judgment part：
(1) arbitrary air reactor is detected using existing apparatus, obtains the time domain waveform that voltage changes over time；
(2) by curve matching, ω is obtained1、ω0, each parameter value such as δ and β, substitute into formula (3), obtain being detected hollow electricity
Reactor voltage amplitude spectrogram with frequency change, is denoted as curve R1。
(3) in the range of ω ∈ [0,1000], as curve R1When below the corresponding amplitude spectral curve R ' of critical fault；
It can determine whether R1Air reactor occur turn-to-turn insulation failure；As amplitude spectral curve R1It is right respectively positioned at critical fault and normal value
When between the amplitude spectral curve R and R ' that answer, air reactor turn-to-turn insulation shape can be judged according to the degree for deviateing normalized curve
State.
Description of the drawings
Fig. 1 is impulse-voltage method basic principle figure proposed by the invention
Fig. 2 is impulse-voltage method voltage time domain waveform proposed by the invention
Fig. 3 is oscillation circuit air reactor both ends amplitude spectrum waveform with frequency change proposed by the invention
Fig. 4 be 4 groups of different induction values proposed by the invention air reactor to amplitude spectral curve
Fig. 5 is software implementation process figure proposed by the invention
Specific implementation mode
The present invention is described in further details below with reference to Figure of description and specific embodiment.
(1) 35kV air reactor turn to turn insulation test is differentiated：Require impulse hunting frequency should be in 100kHz standard
Left and right, according to the relevant parameter of theoretical calculation and analysis, takes：R=5 Ω, C=3nF, UcCharge to 180kV.Under normal condition,
Its air reactor equivalent inductance value is L=100mH.
According to the criterion formula of mechanical periodicity rate and attenuation change rate, formula (4) and (5) are calculated as L=100mH, are faced
Boundary failure inductance value L '=90mH
(2) four groups of different induction value L are arbitrarily chosen1,L2,L3, L4Reactor, judge the side based on frequency-domain analysis failure
Whether method is reasonable.
1) four groups of inductance values are calculated according to time-domain criteria formula and whether there is failure：
The reactor for 4 groups of different induction values that table 1 is chosen
2) four voltage spectrum amplitude curves and criterion curve are drawn using frequency domain amplitude formula
As shown in figure 4, in the range of ω ∈ [0,1000], the size of voltage magnitude is always with the increase of frequency in frequency domain
And increase, that is, there are the relationships of monotonic increase with frequency for reactor both end voltage amplitude.With the variation of inductance value, voltage
The increase rate of amplitude also will produce corresponding variation.Therefore, different induction is utilized to be worth corresponding curve ranges area in a frequency domain
Between i.e. can determine whether turn-to-turn insulation whether there is failure.
By time domain, the frequency domain voltage magnitude formula being fourier transformed draws the inductance of normal condition and fault critical
The corresponding voltage magnitude curve of value, because its frequency and voltage magnitude are dull relationships, if then provable reactor to be detected
The voltage magnitude at both ends belong to frequency domain formula obtain a result in criterion result of calculation, then it represents that the reactor is working properly；If
It goes beyond the scope, indicates reactor turn-to-turn insulation failure.As shown in Figure 4, non-faulting air reactor inductance value L2Amplitude set a song to music
Line is between normal value (L1) and critical value (L3) within the scope of voltage magnitude, and fault value L4Corresponding amplitude spectral curve is not at it
Normal value (L1) and critical value (L3) within the scope of voltage magnitude, you can it is judged as failure.Prove the hollow reactance based on frequency domain character
Device turn-to-turn insulation fault distinguishing method can accurately, easily judge air reactor turn-to-turn insulation failure.
Claims (1)
1. air reactor turn-to-turn insulation fault diagnosis criterion based on time domain waveform by judging that the analysis method compared is converted to
The method compared based on frequency domain character.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810250302.2A CN108318791B (en) | 2018-03-26 | 2018-03-26 | Air-core reactor turn-to-turn insulation fault discrimination method based on frequency domain characteristic analysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810250302.2A CN108318791B (en) | 2018-03-26 | 2018-03-26 | Air-core reactor turn-to-turn insulation fault discrimination method based on frequency domain characteristic analysis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108318791A true CN108318791A (en) | 2018-07-24 |
| CN108318791B CN108318791B (en) | 2019-12-06 |
Family
ID=62898303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810250302.2A Active CN108318791B (en) | 2018-03-26 | 2018-03-26 | Air-core reactor turn-to-turn insulation fault discrimination method based on frequency domain characteristic analysis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108318791B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456241A (en) * | 2019-08-30 | 2019-11-15 | 国家电网有限公司 | Coil turn-to-turn fault detection method |
| CN111190125A (en) * | 2020-01-06 | 2020-05-22 | 长沙理工大学 | Discrimination method for detecting turn-to-turn insulation fault of air-core reactor by pulse voltage method based on FFT transform domain characteristics |
| CN112731220A (en) * | 2020-12-01 | 2021-04-30 | 三峡大学 | Current transformer iron core coil fault diagnosis method based on frequency spectrum analysis |
| CN113852046A (en) * | 2021-09-29 | 2021-12-28 | 南京国电南自电网自动化有限公司 | Method and system for preventing inter-turn protection misoperation of line reactor by adopting bus PT |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3499844B2 (en) * | 2001-08-27 | 2004-02-23 | 株式会社前川製作所 | Displacement detection method and its displacement sensor |
| EP2089894A2 (en) * | 2006-11-27 | 2009-08-19 | Dublin City University | A plasma system and measurement method |
| CN104237703A (en) * | 2014-09-30 | 2014-12-24 | 浙江大学 | Method for recognizing properties of three-phase adaptive re-closing faults of lines with parallel reactors |
| CN105203936A (en) * | 2015-10-26 | 2015-12-30 | 云南电网有限责任公司电力科学研究院 | Method for determining power cable partial discharge defect type based on spectral analysis |
| CN107132441A (en) * | 2017-05-27 | 2017-09-05 | 哈尔滨理工大学 | A kind of diagnostic system and method for dry-type air-core reactor field failure |
-
2018
- 2018-03-26 CN CN201810250302.2A patent/CN108318791B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3499844B2 (en) * | 2001-08-27 | 2004-02-23 | 株式会社前川製作所 | Displacement detection method and its displacement sensor |
| EP2089894A2 (en) * | 2006-11-27 | 2009-08-19 | Dublin City University | A plasma system and measurement method |
| CN104237703A (en) * | 2014-09-30 | 2014-12-24 | 浙江大学 | Method for recognizing properties of three-phase adaptive re-closing faults of lines with parallel reactors |
| CN105203936A (en) * | 2015-10-26 | 2015-12-30 | 云南电网有限责任公司电力科学研究院 | Method for determining power cable partial discharge defect type based on spectral analysis |
| CN107132441A (en) * | 2017-05-27 | 2017-09-05 | 哈尔滨理工大学 | A kind of diagnostic system and method for dry-type air-core reactor field failure |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456241A (en) * | 2019-08-30 | 2019-11-15 | 国家电网有限公司 | Coil turn-to-turn fault detection method |
| CN110456241B (en) * | 2019-08-30 | 2022-02-11 | 国家电网有限公司 | Coil turn-to-turn fault detection method |
| CN111190125A (en) * | 2020-01-06 | 2020-05-22 | 长沙理工大学 | Discrimination method for detecting turn-to-turn insulation fault of air-core reactor by pulse voltage method based on FFT transform domain characteristics |
| CN112731220A (en) * | 2020-12-01 | 2021-04-30 | 三峡大学 | Current transformer iron core coil fault diagnosis method based on frequency spectrum analysis |
| CN113852046A (en) * | 2021-09-29 | 2021-12-28 | 南京国电南自电网自动化有限公司 | Method and system for preventing inter-turn protection misoperation of line reactor by adopting bus PT |
| CN113852046B (en) * | 2021-09-29 | 2024-02-13 | 南京国电南自电网自动化有限公司 | Method and system for preventing turn-to-turn protection misoperation when line reactor adopts bus PT |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108318791B (en) | 2019-12-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108318791A (en) | Air reactor turn-to-turn insulation insulation fault method of discrimination based on frequency domain character analysis | |
| CN103698669B (en) | A kind of high-tension electricity apparatus local discharge pulse separation method | |
| CN104375025B (en) | Diagnostic method for ferromagnetic resonance in neutral non-grounding 10kV system | |
| Cheng et al. | Diagnostic of transformer winding deformation fault types using continuous wavelet transform of pulse response | |
| CN109444528B (en) | Transformer state monitoring system and method based on iron core grounding current | |
| CN106124941A (en) | Reactor turn-to-turn insulation diagnostic method | |
| CN107102245A (en) | Deformation of transformer winding and condenser bushing failure detector and method | |
| JP2008209172A (en) | Partial discharge measuring apparatus | |
| CN108872771A (en) | A kind of transformer preventive trial equivalent method | |
| CN109141218A (en) | A kind of deformation of transformer winding detection method | |
| CN107831404A (en) | Method and system based on the legal position XLPE cable partial discharge position of high-frequency pulse current | |
| CN206594257U (en) | Air reactor turn-to-turn insulation intelligent detection device | |
| Prus et al. | The determination of the condition of the windings of electric machines with long mean-time-between failures | |
| CN108181512B (en) | Winding inlet capacitance testing method based on transformer self-oscillation | |
| Ding et al. | Investigation of vibration impacts on HVAC transformer from HVDC system under monopole operation | |
| CN110927620B (en) | Sleeve with winding deformation and overvoltage on-line monitoring sensor | |
| CN114035001B (en) | High-frequency multi-terminal partial discharge detection positioning method and device for voltage withstand test of transformer | |
| CN110161395B (en) | Method and system for monitoring insulation state of inverter driving motor on line | |
| CN206258539U (en) | Voltage transformer turn-to-turn short circuit detection means | |
| Zhao et al. | Determination of nanosecond pulse parameters on transfer function measurement for power transformer winding deformation | |
| CN104297636B (en) | Pole-mounted distribution substation traveling wave detection method | |
| WO2022233224A1 (en) | Detection apparatus and detection method for inter-turn electromagnetic pulse vibration wave characteristic of turbogenerator rotor winding | |
| Chen et al. | Detection method of low voltage series dc arc based on the pattern matching algorithm | |
| CN206450741U (en) | Dash current tests residual voltage pressure tester | |
| CN207798995U (en) | A kind of oscillation wave detection deformation of transformer winding circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yang Xin Inventor after: Liu Zhen Inventor after: Zeng Lingli Inventor after: Liang Zhen Inventor before: Yang Xin Inventor before: Zeng Lingli Inventor before: Liang Zhen |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |