CN104237634B - Power distribution network PT ferro resonance failure diagnosis and cancellation element - Google Patents
Power distribution network PT ferro resonance failure diagnosis and cancellation element Download PDFInfo
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- CN104237634B CN104237634B CN201410400867.6A CN201410400867A CN104237634B CN 104237634 B CN104237634 B CN 104237634B CN 201410400867 A CN201410400867 A CN 201410400867A CN 104237634 B CN104237634 B CN 104237634B
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 13
- 238000004458 analytical method Methods 0.000 claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims abstract description 10
- 230000008030 elimination Effects 0.000 claims abstract description 7
- 238000003379 elimination reaction Methods 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims abstract description 6
- 230000005294 ferromagnetic effect Effects 0.000 claims 1
- 230000005350 ferromagnetic resonance Effects 0.000 abstract description 15
- 238000013459 approach Methods 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The invention discloses a kind of power distribution network PT ferro resonance failure diagnosis and cancellation element, including central controller, HHT signal analysis module and the bipolarity rectification circuit being connected between voltage transformer open-triangular winding, described bipolarity rectification circuit is provided with four diodes, DC capacitor Cd, linear resistance and gate-controlled switch K.The present invention power distribution network PT ferro resonance failure diagnosis be with the advantages of cancellation element：Simultaneous with ferromagnetic resonance detection and harmonic elimination apparatus, detect that resonant type is fundamental frequency, frequency dividing or high-frequency resonant while resonant energy is consumed；Thoroughly break away from that Fourier transform, wavelet transformation be linear and the constraint of stationarity using HHT KLR signal approachs, you can realize the frequency-domain analysis of voltage signal, while time-domain analysis can be carried out again；Ferromagnetic resonance and singlephase earth fault can be effectively distinguished, and light warning is sent by audible-visual annunciator.
Description
Technical field
The invention belongs to power distribution network control protection technique field, and in particular to a kind of power distribution network PT ferro resonance failure diagnosis
With cancellation element.
Background technology
In 6~35KV power distribution network, system neutral typically uses earth-free mode.Be connected on system busbar measurement and
Monitor insulation against ground electromagnetism be voltage transformer (PT), when occur bus-tie circuit breaker closing operation, the single-phase arc grounding of circuit from
When dynamic disappearance or system loading acute variation, caused transient state impact process may be in PT and three-phase conducting wire pair
Ferromagnetic resonance phenomenon has been excited between ground electric capacity, has caused the overcurrent in system overvoltage and PT so that weak isolating equipment in system
The high-voltage wire iron-melting fusing of flashover, PT over the ground occurs, or even burns PT.PT ferromagnetic resonance be occur in power distribution network the most frequently,
Cause the accident a kind of most Past Voltage within Power System.
At present, limitation PT ferromagnetic resonances mainly use following methods：
(1) PT open deltas connect damping resistance, are disadvantageous in that when selecting resistance, as resistance is too big, does not have and disappear
Humorous effect, as resistance is too small, then require that PT has sufficiently large hot capacity；
(2) nonlinear resistance resonance eliminator is concatenated between the neutral point and ground of PT primary sides, it is limited in that only to this
PT is effective, invalid to other PT, therefore nonlinear resistance resonance eliminator will be installed to each PT, and the volt-ampere of PT in itself is special
Property is inconsistent, influences the signalizing activity of system insulation monitoring device；
(3) the 4PT mode of connection is used, shortcoming is to be possible to occur very big circulation in open delta and cause once
Winding and remaining winding overheat.
The content of the invention
The present invention mainly solves the technical problem present in prior art, so as to provide one kind simultaneous with ferromagnetic resonance
Detection and harmonic elimination apparatus, detect that resonant type is fundamental frequency, frequency dividing or high-frequency resonant while resonant energy is consumed；Using
HHT KLR signal approachs have thoroughly broken away from that Fourier transform, wavelet transformation be linear and the constraint of stationarity, you can realize voltage signal
Frequency-domain analysis, while time-domain analysis can be carried out again；Ferromagnetic resonance and singlephase earth fault can be effectively distinguished, and passes through acousto-optic report
Alert device sends the power distribution network PT ferro resonance failure diagnosis and cancellation element of light warning.
The above-mentioned technical problem of the present invention is mainly what is be addressed by following technical proposals：
A kind of power distribution network PT ferro resonance failure diagnosis and cancellation element, including central controller, HHT signal analysis modules
And the bipolarity rectification circuit between voltage transformer open-triangular winding is connected to, described bipolarity rectification circuit is set
There are four diodes, DC capacitor Cd, linear resistance and gate-controlled switch K.
As preferred embodiments of the present invention, described gate-controlled switch K is by central controller controls, including two control points
A points and B points, described gate-controlled switch can be changed between A points, B points.
As preferred embodiments of the present invention, described power distribution network PT ferro resonance failure diagnosis is also set up with cancellation element
Sound light crossing-signal, described audible-visual annunciator are connected with described HHT signal analysis modules, can send light warning,
Instruction power network is that singlephase earth fault or ferromagnetic resonance failure occurs.
As preferred embodiments of the present invention, described central controller is when residual voltage occurs in open delta, control
Gate-controlled switch K starts HHT signal analysis algorithms while changing harmonic elimination, and detection signal frequency, amplitude simultaneously carry out three-dimensional Hilbert
Analysis.
As preferred embodiments of the present invention, the DC capacitor C of described bipolarity rectification circuitdSize be hundred microfarads extremely
Thousand microfarad ranges.
The present invention power distribution network PT ferro resonance failure diagnosis be with the advantages of cancellation element：Examined simultaneous with ferromagnetic resonance
Survey and harmonic elimination apparatus, detect that resonant type is fundamental frequency, frequency dividing or high-frequency resonant while resonant energy is consumed；Using
HHT KLR signal approachs have thoroughly broken away from that Fourier transform, wavelet transformation be linear and the constraint of stationarity, you can realize voltage signal
Frequency-domain analysis, while time-domain analysis can be carried out again；Ferromagnetic resonance and singlephase earth fault can be effectively distinguished, and passes through acousto-optic report
Alert device sends light warning.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the workflow diagram of the present invention.
Embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, apparent is clearly defined so as to be made to protection scope of the present invention.
The present invention power distribution network PT ferro resonance failure diagnosis be with the advantages of cancellation element：Examined simultaneous with ferromagnetic resonance
Survey and harmonic elimination apparatus, detect that resonant type is fundamental frequency, frequency dividing or high-frequency resonant while resonant energy is consumed；Using
HHT KLR signal approachs have thoroughly broken away from that Fourier transform, wavelet transformation be linear and the constraint of stationarity, you can realize voltage signal
Frequency-domain analysis, while time-domain analysis can be carried out again；Ferromagnetic resonance and singlephase earth fault can be effectively distinguished, and passes through acousto-optic report
Alert device sends light warning.
Shown in reference picture 1, a kind of power distribution network PT ferro resonance failure diagnosis and cancellation element, including following part：
Central controller, HHT signal analysis module, audible-visual annunciator and pair being connected between voltage transformer open-triangular winding
Polarity commutation circuit.
For central controller when residual voltage occurs in open delta, control gate-controlled switch K starts HHT while changing harmonic elimination
Signal analysis algorithm, detection signal frequency, amplitude simultaneously carry out three-dimensional Hilbert analyses.Bipolarity rectification circuit is provided with four
Diode, DC capacitor CdAnd gate-controlled switch K.Described gate-controlled switch K is by central controller controls, including two control points
A points and B points, described gate-controlled switch can be changed between A points, B points.Audible-visual annunciator, light warning can be sent, indicate power network
It is that singlephase earth fault or ferromagnetic resonance failure occurs.DC capacitor CdSize is hundred microfarads to thousand microfarad ranges.
Under normal circumstances, gate-controlled switch K is in A points, DC capacitor CdIt is electrically charged, once resonance or ground connection, open delta go out
Existing residual voltage, central controller starts HHT signal analysis algorithms, detection residual voltage signal frequency, amplitude, while control can
Control switch K is transformed into B points, so that DC capacitor CdDischarged, then moment return A points, so repeatedly 3 times, if failure according to
So exist, be then judged as single-phase earthing, be otherwise judged as ferromagnetic resonance.
It is that central controller controls can when residual voltage occurs in electromagnetic potential transformer open delta shown in reference picture 2
Control switch K is transformed into B points, makes DC capacitor CdDischarged, then moment return A points, so repeatedly 3 times, while control is opened
Dynamic HHT signal analysis algorithms.If now detecting threshold value of the residual voltage still above setting, it is determined as singlephase earth fault,
Audible-visual annunciator sends grounding alarm, is otherwise determined as ferromagnetic resonance failure, and audible-visual annunciator sends resonance alarm signal, enters one
Step carries out HHT signals, drawing three-dimensional three-dimensional Hilbert spectrums, judges that resonant type is frequency dividing, fundamental frequency or high frequency, and carry out humorous
Shake and being accurately positioned for moment occurs.
Only illustrate the mentality of designing of the present invention in one embodiment above, in the case where system allows, this hair
It is bright to expand to while external more functional modules, so as to extend its function to greatest extent.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
The change or replacement expected without creative work, it should all be included within the scope of the present invention.Therefore, it is of the invention
Protection domain should be determined by the scope of protection defined in the claims.
Claims (1)
1. a kind of power distribution network PT ferro resonance failure diagnosis and cancellation element, it is characterised in that：Believe including central controller, HHT
Number analysis module and the bipolarity rectification circuit being connected between voltage transformer open-triangular winding, described bipolarity
Rectification circuit is provided with four diodes, DC capacitor Cd, linear resistance and gate-controlled switch K, described gate-controlled switch K by
Central controller controls, including two control point A points and B points, described gate-controlled switch can be changed between A points, B points, described
Power distribution network PT ferro resonance failure diagnosis and cancellation element are additionally provided with audible-visual annunciator, described audible-visual annunciator with it is described
HHT signal analysis modules be connected, light warning can be sent, instruction power network is that singlephase earth fault or ferromagnetic occurs
Resonance failure, for described central controller when residual voltage occurs in open delta, control gate-controlled switch K changes the same of harmonic elimination
Shi Qidong HHT signal analysis algorithms, detection signal frequency, amplitude simultaneously carry out three-dimensional Hilbert analyses, and described bipolarity is whole
The DC capacitor C of current circuitdSize is hundred microfarads to thousand microfarad ranges.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410400867.6A CN104237634B (en) | 2014-08-14 | 2014-08-14 | Power distribution network PT ferro resonance failure diagnosis and cancellation element |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410400867.6A CN104237634B (en) | 2014-08-14 | 2014-08-14 | Power distribution network PT ferro resonance failure diagnosis and cancellation element |
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| Publication Number | Publication Date |
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| CN104237634A CN104237634A (en) | 2014-12-24 |
| CN104237634B true CN104237634B (en) | 2018-03-06 |
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| CN105913190A (en) * | 2016-04-15 | 2016-08-31 | 国网江苏省电力公司盐城供电公司 | Calculation method for alarm accuracy of ferromagnetic resonance fault |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2702502Y (en) * | 2004-03-04 | 2005-05-25 | 保定浪拜迪电气股份有限公司 | A ferromagnetic resonance diagnostic eliminator of voltage transformer |
| CN101551433A (en) * | 2009-05-05 | 2009-10-07 | 昆明理工大学 | Distribution network feed out circuit fault circuit selection method by using HHT detection technology |
| CN102360880A (en) * | 2011-08-13 | 2012-02-22 | 陈劲游 | Ferroresonance-preventing self-power supply device of electronic voltage transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7990137B2 (en) * | 2009-03-30 | 2011-08-02 | Tdk Corporation | Device of evaluating magnetic read head and method of evaluating magnetic read head |
| CN202818133U (en) * | 2012-08-29 | 2013-03-20 | 黄家兴 | Circuit of dual-supply apparatus |
| CN204065239U (en) * | 2014-08-14 | 2014-12-31 | 国家电网公司 | Power distribution network PT ferro resonance failure diagnosis and cancellation element |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2702502Y (en) * | 2004-03-04 | 2005-05-25 | 保定浪拜迪电气股份有限公司 | A ferromagnetic resonance diagnostic eliminator of voltage transformer |
| CN101551433A (en) * | 2009-05-05 | 2009-10-07 | 昆明理工大学 | Distribution network feed out circuit fault circuit selection method by using HHT detection technology |
| CN102360880A (en) * | 2011-08-13 | 2012-02-22 | 陈劲游 | Ferroresonance-preventing self-power supply device of electronic voltage transformer |
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