CN104280718A - Transformer station abnormal sound monitoring and positioning method - Google Patents
Transformer station abnormal sound monitoring and positioning method Download PDFInfo
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- CN104280718A CN104280718A CN201310270791.5A CN201310270791A CN104280718A CN 104280718 A CN104280718 A CN 104280718A CN 201310270791 A CN201310270791 A CN 201310270791A CN 104280718 A CN104280718 A CN 104280718A
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- transformer station
- signal
- monitoring
- array
- abnormal noise
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/18—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic, or infrasonic waves
- G01S5/20—Position of source determined by a plurality of spaced direction-finders
-
- 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
- G01R31/1209—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 using acoustic measurements
Abstract
The invention relates to the electrical field, and particularly to a transformer station abnormal sound monitoring and positioning method. According to the method, a sound wave signal which is generated by partial discharging is used as a detecting object. A device according to the method comprises the components of: a sound wave phase control plane array sensor, a multichannel synchronous high-speed data acquisition system, a signal conditioning module, a DSP data processing module and a network communication module. The transformer station abnormal sound monitoring and positioning method is mainly characterized by comprising the steps of: 1) dividing a transformer station bus area into a plurality of areas, setting the geometric centre of each area, and configuring a sound wave sensor planar array on each geometric center; 2) processing the signal which is received by the sensor through the signal conditioning module, and transmitting the processed signal to the multichannel synchronous high-speed data acquisition system; 3) performing digital wave beamforming on the sound wave by the DSP data processing module, and furthermore calculating the position of a discharging point; and 4) transmitting a positioning result and a control instruction by the network communication module. According to the transformer station abnormal sound monitoring and positioning method, phased array technology is used for realizing transformer station abnormal sound positioning and an accuracy is improved. DSP parallel operation is used for processing data, thereby realizing high speed and high effect.
Description
Technical field
The invention belongs to electricity field, particularly the monitoring of a kind of transformer station abnormal noise and localization method.
Background technology
Transformer station has the abnormal noise produced because of electric discharges such as equipment connection place, insulation columns often.The electric discharge that electric discharge herein refers to the electric discharge that Electric Power Equipment Insulation part occurs in subrange under enough strong electric field action or produces because of loose contact in power equipment junction.The dielectric strength that all can cause insulating medium of discharging each time or link damage, the impact of slight electric discharge on Electric Power Equipment Insulation or link is less, and the decline of equipment performance is more slow; And strong electric discharge, then dielectric strength or indirect component capabilities can be made to decline very soon.This is the key factor that high voltage electric power equip ment is damaged.Therefore, monitoring to be strengthened to operating equipment, when being discharged beyond to a certain degree, should be out of service by equipment, carry out overhauling or changing.
The existing detection and positioning device for separate unit electrical equipment at present, the spatial sound source for substation bus bar and connected device detect and the technology of location there is not been reported.Main difficulty is transformer station's space electric discharge is multiple spot electric discharge, and most electric discharge belongs to normal phenomenon (as corona).Sound wave is propagated in atmosphere, along with propagation distance produces decay.If use a sonic sensor simple, failure message will be submerged in the acoustic signals of various regular picture generation.Therefore, the detection and positioning of implementation space sound source, pick-up unit must have the ability (directive property) that dimensional orientation detects, and namely have maximum sensitivity to the direction of specifying, the signal then received non-designated direction is the smaller the better.Machinery rotates also can realize directive property, but for phased scanning, more than slow 3 orders of magnitude of its sweep velocity, and electric discharge has randomness, and sweep velocity can cause dropout slowly.Therefore for reaching high precision, phased scanning must be adopted.
When there is electric discharge in medium, the dielectric heating around discharge source makes it evaporate by the energy of its instantaneous relase, and effect is just as a little blast.Now discharge source is as same sound source, outwards sends sound wave.Because the discharge period is very short, the sound wave spectrum launched is very wide, can reach several MHz.The present invention realizes location by the acoustic signals detecting electric discharge generation.
Summary of the invention
For solving transformer station's abnormal noise monitoring and orientation problem, in conjunction with phased-array technique, the invention provides the abnormal noise monitoring of a kind of transformer station and localization method.
For the linear array arranged at equal intervals, its directivity function is
, in formula,
for the array number of linear array,
for the spacing between adjacent array element,
for the wavelength of incident acoustic wave,
for the angle of incident acoustic wave and linear array normal direction, this array according to
direction a plane interscan.For planar array, then array according to
,
corresponding
,
carry out spacescan, wherein,
the phase shift caused for the path difference because of each array,
it is the additional phase shift established for stress release treatment.
For planar array of the present invention, can the center of this planar array as a reference point, set up spheric coordinate system.Suppose that the incident direction of acoustic signals is
if the intensity of holding signal is constant, then the output of this array
just react its sensitivity to different directions signal,
be called the directivity function of this array.If there is some angles
with
make
obtain maximal value, so just can think
there is sound source in direction.Therefore by Beam synthesis, directivity function is drawn
, ask the direction that its maximal value is corresponding
, just can find the orientation at sound source place to be exactly
.
The acoustic signals that power equipment discharge produces by the method is as detected object, comprise sound wave Phased Array Receiving planar array sensor module, multi-channel synchronous high-speed data acquistion system, Signal-regulated kinase, DSP data processing module and network communication module, and take into full account the undesired signal got rid of beyond electric discharge.Annexation between its modules is: sound wave Phased Array Receiving sensor plane array, Signal-regulated kinase, multi-channel synchronous high-speed data acquistion system, DSP data processing module connect successively, network connects positioning system and host computer, jointly completes on-line monitoring and the location of transformer station's abnormal noise.Its main implementation step comprises the following steps.
1) according to the length in substation bus bar district, be divided into several equally spaced regions, and the geometric center in each region is set.One is arranged in each geometric center
(as an enforcement example, the present invention gets
) sonic sensor planar array, for the acoustic signals of receiving center frequency 40KHz, bandwidth 50KHz.In planar array, every 21 sensors are one group, totally 21 groups.Sensor arrangement quadrate plane, the distance between each sensor is equidistant.
2) signal of sensor reception is through Signal-regulated kinase process, and Signal-regulated kinase is made up of bandpass filter, prime amplifier, wave detector sum-product intergrator etc.
3) output grouping of Signal-regulated kinase is connected to corresponding multi-channel synchronous high-speed data acquistion system, and the sampling rate of data acquisition system (DAS) to acoustic signals is set to 100KS/s(sampling rate should be greater than 20KHz, this example gets 100KHz), the data after collection reach DSP module.Multi-channel synchronous high-speed data acquistion system is one group, 21 passage, totally 21 groups, and each passage configures a Signal-regulated kinase, and each group shares one piece of dsp chip.
4) signal that each group DSP module obtain collection is run simultaneously process, and carries out digital bea mforming to each group of acoustic signals, the directivity function of calculating acquisition sonic sensor planar array
.Fine tuning beam position, makes
obtain maximal value
, and then draw position angle and the elevation angle of phase-array scanning, determine point of discharge direction, be
.
5) according to time delay and the phase angle of adjacent two array scannings, point of discharge distance is calculated
.According to the cosine law
,
, wherein
be the scanning phase angle of two adjacent array,
for the distance between point of discharge to two adjacent array,
be the center distance between two adjacent array,
for the time delay scanned between adjacent array,
for the aerial speed of sound wave.Point of discharge distance can be solved according to above two formula
=
, scan the point of discharge direction obtained in conjunction with array 1, the space geometry position getting final product orientation discharge point is
.
Network communication module realizes the communication between positioning system and host computer, for transmitting positioning result and steering order.
Adopt canonical correlation technique estimated signal source number, avoid colored component in Gaussian noise to strengthen and signal number accuracy of estimation is declined; Data processing method is adopted to carry out measurement data association, thus discharge source distance is estimated: by two observation stations, direction finding is carried out to target, the intersection point of each direction finding line is exactly the position of target, from each observation station appoint get two incoherent measurement data just can located space a bit.
Accompanying drawing explanation
Fig. 1 is linear array schematic diagram at equal intervals.
The space coordinates that Fig. 2 arranges schematic diagram for sound wave Phased Array Receiving planar array inner sensor and adopts.
Fig. 3 is position system function block diagram.
Fig. 4 is that substation bus bar subregion and sensor array arrange schematic diagram.
Embodiment
The invention provides the abnormal noise monitoring of a kind of transformer station and localization method, below in conjunction with accompanying drawing, it is described further.
Figure 3 shows that the functional block diagram of whole positioning system, each dotted line frame represents a planar array, only depicts two planar arrays in detail, and remaining represents with the perpendicular dotted line between head and the tail two frames.Sound wave Phased Array Receiving planar array sensor, Signal-regulated kinase, multi-channel synchronous high-speed data acquisition card, network communication module and DSP module are together placed in inside the casing of a square shape, and draw telecommunication cable and be connected to host computer.
Figure 2 shows that the space coordinates that in planar array, each sensor is arranged and adopted, sensor used is diameter of section
cylindrical probe.Every 21 sensors are one group, totally 21 groups.Sensor arrangement quadrate plane, the distance between each sensor is equidistant.Consider that transducer spacing should be greater than the half-wavelength of sound wave as well, get center distance
.
Fig. 4 is that substation bus bar subregion and sensor array arrange schematic diagram, wherein
represent discharge source,
for sensor plane array.According to the length in substation bus bar district
, be divided into several (as N) equally spaced regions
, and the geometric center in each region is set.21 × 21 sonic sensor planar arrays are arranged, for the acoustic signals of receiving center frequency 40KHz, bandwidth 50KHz in geometric center.
The signal that sensor receives delivers to Signal-regulated kinase.Signal-regulated kinase forms primarily of bandpass filter, prime amplifier, wave detector and integrator.After conditioning, Received signal strength is exaggerated, and the sound, white noise and the undesired signal to be caused by corona that filtering neighbourhood noise, switch send when closing and cut-off.
The output grouping of Signal-regulated kinase is connected to corresponding multi-channel synchronous high-speed data acquistion system, and the sampling rate of data acquisition system (DAS) to acoustic signals is set to 100KS/s.High-speed data acquistion system is one group, 21 passage, totally 21 groups, and each passage configures a Signal-regulated kinase, and each group shares one piece of dsp chip.Data after collection reach DSP module.
The signal that each group of DSP module obtains collection is run simultaneously process, and carries out digital bea mforming to each group of acoustic signals, calculates the directivity function obtaining sonic sensor planar array
.Fine tuning beam position, makes
obtain maximal value
, and then draw position angle and the elevation angle of phase-array scanning, determine point of discharge direction, be
.
As Fig. 4, according to time delay and the phase angle of adjacent two array scannings, calculate point of discharge distance
.According to the cosine law
,
, wherein
be the scanning phase angle of two adjacent array,
for the distance between point of discharge to two adjacent array,
be the center distance between two adjacent array,
for the time delay scanned between adjacent array,
for the aerial speed of sound wave.Point of discharge distance can be solved according to above two formula
=
, scan the point of discharge direction obtained in conjunction with array 1, the space geometry position getting final product orientation discharge point is
.
Network communication module realizes the communication between positioning system and host computer.The information transmission of at every turn locating is shown to host computer, analyzes judgement for operator; Operator also can send out steering order to positioning system, as carried out sample frequency setting, making high-speed data acquistion system carry out synchronous acquisition etc.
Below be only one of the present invention and implement an example.But form of implementation in fact of the present invention was not limited to last example, and its embodiment can have more version.From the distortion that content disclosed by the invention directly derives, protection scope of the present invention all should be belonged to.
Although more employ the term such as electric discharge, sound wave Phased Array Receiving planar array sensor herein, do not get rid of the possibility using other terms.These terms are used to be only used to describe and explain essence of the present invention more easily; The restriction that they are construed to any one additional is all contrary with spirit of the present invention.
Claims (8)
1. transformer station's abnormal noise monitoring and localization method, it is characterized in that: acoustic signals electric discharge produced is as detected object, comprise sound wave Phased Array Receiving planar array sensor module, multi-channel synchronous high-speed data acquistion system, Signal-regulated kinase, DSP data processing module and network communication module, and take into full account the undesired signal got rid of beyond electric discharge; Annexation between its modules is: sound wave Phased Array Receiving sensor plane array, Signal-regulated kinase, multi-channel synchronous high-speed data acquistion system, DSP data processing module connect successively, network connects positioning system and host computer, jointly completes on-line monitoring and the location of transformer station's abnormal noise.
2. the monitoring of transformer station according to claim 1 abnormal noise and localization method, it is characterized in that: described sound wave Phased Array Receiving planar array sensor, form receiving array by 21 × 21 sonic sensors, be arranged in square-shaped planar, the distance between sensor is equidistant.
3. the monitoring of transformer station according to claim 1 abnormal noise and localization method, is characterized in that: the acoustic signals of frequency 40KHz, bandwidth 50KHz centered by the signal that described sonic sensor Phased Array Receiving planar array receives.
4. the monitoring of transformer station according to claim 1 abnormal noise and localization method, is characterized in that: described multi-channel synchronous high-speed data acquistion system is one group, 21 passage, 21 groups totally; Every passage has a Signal-regulated kinase; Often group shares a slice DSP; 21 groups of DSP run simultaneously work.
5. the monitoring of transformer station according to claim 1 abnormal noise and localization method, is characterized in that: described Signal-regulated kinase is primarily of compositions such as bandpass filter, prime amplifier, wave detector, integrators.
6. the monitoring of transformer station according to claim 1 abnormal noise and localization method, is characterized in that: multi-channel synchronous high-speed data acquistion system signal sampling rate is 150KS/s.
7. the monitoring of transformer station according to claim 1 abnormal noise and localization method, is characterized in that: the sound sent when the undesired signal beyond described electric discharge mainly comprises neighbourhood noise, switch closes and cut-off, white noise and the undesired signal caused by corona.
8. the monitoring of transformer station according to claim 1 abnormal noise and localization method, is characterized in that: mixed-media network modules mixed-media realizes the communication between host computer and positioning system, transmission positioning result and steering order.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310270791.5A CN104280718A (en) | 2013-07-01 | 2013-07-01 | Transformer station abnormal sound monitoring and positioning method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310270791.5A CN104280718A (en) | 2013-07-01 | 2013-07-01 | Transformer station abnormal sound monitoring and positioning method |
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| Publication Number | Publication Date |
|---|---|
| CN104280718A true CN104280718A (en) | 2015-01-14 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203937A (en) * | 2015-10-28 | 2015-12-30 | 国网江西省电力公司南昌供电分公司 | Internal discharge mode recognition method and fault diagnosis system for transformer |
| CN106872867A (en) * | 2017-03-10 | 2017-06-20 | 华北电力大学 | The recognition methods of power equipment partial discharges fault, apparatus and system |
| CN109682463A (en) * | 2019-02-14 | 2019-04-26 | 深圳供电局有限公司 | Substation's audible noise measuring method |
| CN110146764A (en) * | 2019-06-14 | 2019-08-20 | 国网新疆电力有限公司电力科学研究院 | A kind of power equipment method for detecting abnormality based on acoustic array edge calculations |
| CN110926784A (en) * | 2019-12-10 | 2020-03-27 | 上海欧秒电力监测设备有限公司 | GIS circuit breaker fault on-line monitoring device based on sound |
| CN112904139A (en) * | 2020-10-10 | 2021-06-04 | 国网山东省电力公司枣庄供电公司 | High-voltage switch cabinet partial discharge positioning method and system considering temperature field change |
-
2013
- 2013-07-01 CN CN201310270791.5A patent/CN104280718A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 谢理: "《基于DSP的开关柜局部放电在线监测方法及系统研究》", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203937A (en) * | 2015-10-28 | 2015-12-30 | 国网江西省电力公司南昌供电分公司 | Internal discharge mode recognition method and fault diagnosis system for transformer |
| CN106872867A (en) * | 2017-03-10 | 2017-06-20 | 华北电力大学 | The recognition methods of power equipment partial discharges fault, apparatus and system |
| CN106872867B (en) * | 2017-03-10 | 2019-08-20 | 华北电力大学 | The recognition methods of power equipment partial discharges fault, apparatus and system |
| CN109682463A (en) * | 2019-02-14 | 2019-04-26 | 深圳供电局有限公司 | Substation's audible noise measuring method |
| CN110146764A (en) * | 2019-06-14 | 2019-08-20 | 国网新疆电力有限公司电力科学研究院 | A kind of power equipment method for detecting abnormality based on acoustic array edge calculations |
| CN110926784A (en) * | 2019-12-10 | 2020-03-27 | 上海欧秒电力监测设备有限公司 | GIS circuit breaker fault on-line monitoring device based on sound |
| CN110926784B (en) * | 2019-12-10 | 2021-07-27 | 上海欧秒电力监测设备有限公司 | GIS circuit breaker fault on-line monitoring device based on sound |
| CN112904139A (en) * | 2020-10-10 | 2021-06-04 | 国网山东省电力公司枣庄供电公司 | High-voltage switch cabinet partial discharge positioning method and system considering temperature field change |
| CN112904139B (en) * | 2020-10-10 | 2022-07-22 | 国网山东省电力公司枣庄供电公司 | High-voltage switch cabinet partial discharge positioning method and system considering temperature field change |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Weiguo Inventor after: Liu Fuhao Inventor after: Zeng Chen Inventor after: Cai Zhengzi Inventor after: Zhang Huiyuan Inventor after: Chen Yan Inventor before: Li Weiguo Inventor before: Cao Wenbin Inventor before: Gao Xingjun Inventor before: Jia Pengfei Inventor before: Chen Yan |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: LI WEIGUO CAO WENBIN GAO XINGJUN JIA PENGFEI CHEN YAN TO: LI WEIGUO LIU FUHAO CENG CHEN CAI ZHENGZI ZHANG HUIYUAN CHEN YAN |
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Application publication date: 20150114 |