CN107102244B - A kind of discharge source localization method of GIS ultrahigh frequency local discharge on-line monitoring device - Google Patents
A kind of discharge source localization method of GIS ultrahigh frequency local discharge on-line monitoring device Download PDFInfo
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- 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
- G01R31/1227—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 of components, parts or materials
- G01R31/1254—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 of components, parts or materials of gas-insulated power appliances or vacuum gaps
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Abstract
The invention discloses a kind of discharge source localization methods of GIS ultrahigh frequency local discharge on-line monitoring device.Currently, superfrequency local discharge on-line monitoring device because it is lower to the processing sample rate of the peak signal detected, can not realize the accurate positioning of shelf depreciation source position using the time difference between signal.The present invention acquires the ultrahigh-frequency signal of GIS device using GIS ultrahigh frequency local discharge on-line monitoring device；The envelope of each ultrahigh-frequency signal is extracted using Gaussian smoothing filter method；The time domain cumlative energy function of each superfrequency envelope signal is calculated, and is normalized；The inflection point of time domain cumlative energy function curve after calculating each normalization, uprushes the moment, i.e. signal initial time as signal energy；The difference between each signal initial time is calculated, calculates electric discharge source position using discharge source ranging formula.The present invention directly can carry out positioning using TDOA using the low sampled signal of GIS ultrahigh frequency local discharge on-line monitoring device.
Description
Technical field
The present invention relates to electrical engineering field, especially a kind of discharge source positioning side of GIS ultrahigh frequency on-line monitoring system
Method.
Background technique
Gas-insulated switchgear (Gas Insulated Switchgear, abbreviation GIS) because it is compact-sized, not by the external world
The influence of environment, the advantages that time between overhauls(TBO) is long, occupy an important position in power transmission and transformation system.
Operating experience shows the problems such as assembly technology due to GIS, manufacture material, transport, operation aging, internal normal
It is commonly present a variety of or multiple defects.With the increase of the operation time limit, internal defects are gradually serious, in high current, overvoltage etc.
Under inducement, it is possible to cause insulation breakdown or arcing fault, form the power outage of large area, cause huge economic losses and production
Raw severe social influence.China's extra-high voltage, ultra-high pressure switch equipment once occurred excessive cause latency insulation fault and caused
Pernicious power outage.
Compared to other several GIS partial discharge detection methods (such as ultrasonic wave, gas composition analysis method), superfrequency method
Good, high sensitivity, defect type easy to identify and the shelf depreciation inspection that can realize discharge source positioning as a kind of interference free performance
Survey method gradually obtains the approval of domestic and foreign scholars.
For local discharge signal inside real-time monitoring GIS, the state of insulation inside GIS device is assessed, avoids GIS device prominent
The generation of hair accident, superfrequency local discharge on-line monitoring device have been widely used in GIS device, achieve preferable application
Effect.But superfrequency local discharge on-line monitoring device because its to the processing sample rate of the peak signal detected compared with
It is low, the accurate positioning of shelf depreciation source position can not be realized using the time difference between signal, can only be existed by superfrequency shelf depreciation
The ultrahigh-frequency signal amplitude attenuation rule of line monitoring device, probably judges the position of discharge source, positioning method error is up to several meters.
Original ultrahigh-frequency signal need to be acquired using high sampling rate oscillograph by technical staff to realize by being accurately positioned, increase it is artificial and
The investment of instrument.
Summary of the invention
The technical problem to be solved by the present invention is to overcome existing GIS ultrahigh frequency local discharge on-line monitoring device can not benefit
The pinpoint problem of Partial Discharge Sources is realized with the time difference between low sampled signal, and a kind of GIS ultrahigh frequency shelf depreciation is provided and is existed
The discharge source localization method of line monitoring device can be adopted directly using the low of GIS ultrahigh frequency local discharge on-line monitoring device
Sample signal carries out positioning using TDOA, realizes the accurate positioning of Partial Discharge Sources.
In order to solve the above technical problems, the technical solution adopted by the present invention are as follows: a kind of GIS ultrahigh frequency shelf depreciation is supervised online
Survey the discharge source localization method of device, comprising:
Utilize the ultrahigh-frequency signal of GIS ultrahigh frequency local discharge on-line monitoring device acquisition GIS device；
By the ultrahigh-frequency signal, the envelope of each ultrahigh-frequency signal is extracted using Gaussian smoothing filter method；
Calculate the time domain cumlative energy function of each superfrequency envelope signal；
The time domain accumulation energy function signal being calculated is normalized, normalized time domain accumulation energy is obtained
Flow function signal curve；
The inflection point for calculating each time domain cumlative energy function curve, uprushes the moment as signal energy, i.e., when signal originates
It carves；
The difference between each signal initial time is calculated, calculates electric discharge source position using discharge source ranging formula.
Further, above-mentioned discharge source localization method further include:
It is multiple using GIS ultrahigh frequency local discharge on-line monitoring device repeated acquisition and the above-mentioned ultrahigh-frequency signal of processing；
The location Calculation of multiple discharge source position is counted as a result, final position location is determined with maximum probability position, to disappear
Except single positions error caused by accidentalia.
Further, the number of repeated acquisition and processing signal is 50 to 100 times.
Further, the specific calculating step of the envelope are as follows: ultrahigh-frequency signal sample amplitude when reproduced value is squared, is obtained
To unipolarity energy waveform；Unipolarity energy waveform and Gaussian function are calculated into convolution and obtain its envelope；To envelope into
Row normalization, obtains final envelope.
Further, the formula of the Gaussian function are as follows:
In formula, parameter σ (0 < σ < 100) value influences the waveform of envelope；T indicates moment, unit ns.
Further, the calculation formula of the time domain cumlative energy function are as follows:
Wherein, V (ti) it is tiThe sampled signal at moment, if total sampling number is k, U (tk) it is the total electric discharge energy of signal
Amount.
Further, if the time difference Δ t=t of known Partial Discharge Sources two sides sensor signal2–t1, Partial Discharge Sources distance
The distance of sensor is acquired by following formula:
x1=0.5 (X-c Δ t),
In formula, X is the distance between two sensors positioned at Partial Discharge Sources two sides；C is the propagation of ultrahigh-frequency signal
Speed, the i.e. light velocity；x1For the distance of the sensor distance Partial Discharge Sources on the left of Partial Discharge Sources.
Further, inflection point is calculated as seeking the time-derivative of cumlative energy function curve, and maximum thinks inflection point.
The invention has the benefit that the present invention can directly utilize GIS ultrahigh frequency local discharge on-line monitoring device
Low sampled signal carry out positioning using TDOA, without increasing artificial and hardware investment, be suitable for mounted GIS on-line monitoring at present
Device.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the discharge source localization method of GIS ultrahigh frequency local discharge on-line monitoring device provided in an embodiment of the present invention
Flow chart.
Specific embodiment
The present invention provides a kind of discharge source localization method of GIS ultrahigh frequency local discharge on-line monitoring device, this method energy
Enough utilize the accurate positioning using TDOA of low sampled signal progress for directly utilizing GIS ultrahigh frequency local discharge on-line monitoring device.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to FIG. 1, Fig. 1 is the electric discharge of GIS ultrahigh frequency local discharge on-line monitoring device provided in an embodiment of the present invention
Source localization method flow chart；This method may include:
The ultrahigh-frequency signal of step 1, GIS ultrahigh frequency local discharge on-line monitoring device acquisition GIS device.
Step 2, by the ultrahigh-frequency signal, the envelope of each ultrahigh-frequency signal is extracted using Gaussian smoothing filter method
Line.
The specific calculating step of envelope are as follows: ultrahigh-frequency signal sample amplitude when reproduced value is squared, unipolarity energy is obtained
Waveform；Gaussian function shown in energy waveform and formula (1), which is calculated convolution, can be obtained its envelope；Normalizing is carried out to envelope
Change, obtains final envelope.
Gaussian function formula are as follows:
The waveform of parameter σ (0 < σ < 100) value influence envelope；T indicates moment, unit ns.Parameter σ value is smaller
When, envelope can still show stronger oscillating characteristic；When value is excessive, ultrahigh-frequency signal envelope trait can be deviateed.Comparison σ exists
Within the scope of a few to tens of when value envelope waveform, can obtain between both of the above when σ is taken as 20 and preferably balance, wrap
Winding thread is met the requirements.
Step 3, the time domain cumlative energy function for calculating each superfrequency envelope signal.
Cumlative energy method calculates antenna to the cumlative energy curve for receiving signal, calculation formula first are as follows:
Wherein, V (ti) it is tiThe sampled signal at moment, if total sampling number is k, U (tk) it is the total electric discharge energy of signal
Amount.
The time domain accumulation energy function signal being calculated is normalized in step 4, obtains normalized time domain
Cumlative energy function signal curve.
Step 5, the inflection point for calculating each time domain cumlative energy function curve are uprushed constantly i.e. signal as signal energy
Begin the moment；Inflection point is calculated as seeking the time-derivative of cumlative energy function curve, and maximum thinks inflection point.
Difference between step 6, calculating each signal initial time is put using the calculating of discharge source positioning using TDOA formula
Position of source.
Discharge source time-of-arrival loaction principle is, if known Partial Discharge Sources (abbreviation partial discharge source) two sides sensor signal when
Poor Δ t=t2–t1, the distance of partial discharge source range sensor can be acquired by following formula:
x1=0.5 (X-c Δ t) (3)
In formula, X is the distance between two sensors positioned at Partial Discharge Sources two sides；C is the propagation of ultrahigh-frequency signal
Speed, the i.e. light velocity；x1For the distance of the sensor distance Partial Discharge Sources on the left of Partial Discharge Sources.
It is step 7, multiple using GIS ultrahigh frequency local discharge on-line monitoring device repeated acquisition and the above-mentioned signal of processing, it is secondary
Number can be 50 times to 100 times.
Step 8 counts the location Calculation of multiple discharge source position as a result, with the final sprocket bit of the determination of maximum probability position
It sets, to eliminate error caused by single positioning accidentalia.
Claims (4)
1. a kind of discharge source localization method of GIS ultrahigh frequency local discharge on-line monitoring device characterized by comprising
Utilize the ultrahigh-frequency signal of GIS ultrahigh frequency local discharge on-line monitoring device acquisition GIS device；
By the ultrahigh-frequency signal, the envelope of each ultrahigh-frequency signal is extracted using Gaussian smoothing filter method；
Calculate the time domain cumlative energy function of each superfrequency envelope signal；
The time domain accumulation energy function signal being calculated is normalized, normalized time domain cumlative energy letter is obtained
Number signal curve；
The inflection point for calculating each time domain cumlative energy function curve, uprushes the moment as signal energy, i.e. signal initial time；
The difference between each signal initial time is calculated, calculates electric discharge source position using discharge source ranging formula；
Multiple using GIS ultrahigh frequency local discharge on-line monitoring device repeated acquisition and the above-mentioned ultrahigh-frequency signal of processing, repetition is adopted
The number of collection and processing signal is 50 to 100 times；
The location Calculation of multiple discharge source position is counted as a result, final position location is determined with maximum probability position, to eliminate list
Error caused by secondary positioning accidentalia；
Positioning using TDOA is carried out using the low sampled signal of GIS ultrahigh frequency local discharge on-line monitoring device, realizes Partial Discharge Sources
Accurate positioning；
The specific calculating step of the envelope are as follows: ultrahigh-frequency signal sample amplitude when reproduced value is squared, unipolarity energy is obtained
Waveform；Unipolarity energy waveform and Gaussian function are calculated into convolution and obtain its envelope；Envelope is normalized, is obtained
Final envelope；
The formula of the Gaussian function are as follows:
In formula, parameter σ value influences the waveform of envelope；T indicates moment, unit ns.
2. discharge source localization method according to claim 1, which is characterized in that the calculating of the time domain cumlative energy function
Formula are as follows:
Wherein, V (ti) it is tiThe sampled signal at moment, if total sampling number is k, U (tk) it is the total discharge energy of signal.
3. discharge source localization method according to claim 1, which is characterized in that
If the time difference Δ t=t of known Partial Discharge Sources two sides sensor signal2–t1, the distance of Partial Discharge Sources range sensor
It is acquired by following formula:
x1=0.5 (X-c Δ t),
In formula, X is the distance between two sensors positioned at Partial Discharge Sources two sides；C is the spread speed of ultrahigh-frequency signal,
That is the light velocity；x1For the distance of the sensor distance Partial Discharge Sources on the left of Partial Discharge Sources.
4. discharge source localization method according to claim 1, which is characterized in that inflection point is calculated as asking cumlative energy function bent
The time-derivative of line, maximum think inflection point.
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| CN116626454B (en) * | 2023-05-26 | 2024-01-02 | 国网江苏省电力有限公司电力科学研究院 | Oil paper insulation UHF partial discharge signal anti-interference identification and positioning method and device based on correction time-frequency clustering |
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