CN106093733B - The measuring device of corona current and multiple spot corona current localization method is carried out with it - Google Patents

The measuring device of corona current and multiple spot corona current localization method is carried out with it Download PDF

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Publication number
CN106093733B
CN106093733B CN201610621133.XA CN201610621133A CN106093733B CN 106093733 B CN106093733 B CN 106093733B CN 201610621133 A CN201610621133 A CN 201610621133A CN 106093733 B CN106093733 B CN 106093733B
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magnetic field
corona
discharge
corona current
measurement
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CN106093733A (en
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胡军
赵根
何金良
欧阳勇
王善祥
毕建刚
常文治
庄池杰
张波
曾嵘
余占清
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Tsinghua University
China Electric Power Research Institute Co Ltd CEPRI
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Tsinghua University
China Electric Power Research Institute Co Ltd CEPRI
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

The present invention relates to a kind of localization method and devices of corona current, belong to Operation of Electric Systems monitoring and measurement technology field.The features such as high sensitivity for having using tunnel magneto magnetic field sensor, broadband, strong antijamming capability and sensibility to magnetic direction, twin shaft magnetic field sensing measuring device is made, the measurement to corona current surrounding magnetic field in bad electromagnetic environment is realized in the form of sensor array, and the localization method to corona point is proposed by measuring magnetic field value, finally obtain the approximate region and approximate point of discharge of corona point.The measurement advantage of the method for the present invention and device based on tunnel magneto magnetic field sensor, the magnetic field signal generated for high frequency corona discharge electric current measure, take into account corona current feature, realize the accurate positionin of corona point.The present invention solves the problems, such as that the corona current that can not be generated to apparatus insulated defect is accurately positioned, and greatly improves the stability and precision of magnetic field and current measurement under extreme electromagnetic environment, improves stability operation and the dielectric level of power grid.

Description

The measuring device of corona current and multiple spot corona current localization method is carried out with it
Technical field
Multiple spot corona current localization method is carried out the present invention relates to a kind of measuring device of multiple spot corona current and with it, is belonged to In Operation of Electric Systems monitoring and measurement technology field.
Background technique
Great mass of data shows that the main reason for leading to high-tension electricity equipment fault is the deterioration and failure of insulation performance, because Most failures of this high-tension electricity equipment are finally attributed to insulation failure.Shelf depreciation is cause insulation degradation main The important characterization of reason and insulation degradation.A kind of principal mode of the corona discharge as shelf depreciation, being includes that radio is dry It disturbs, the main source of electromagnetic environment problem including audible noise, has become one of high voltage power transmission key technical problem at present.Cause This detection device shelf depreciation and corona discharge can effectively assess apparatus insulated state, and early warning is likely to occur exhausted Reason barrier, it is horizontal to improve equipment safety operation.It can produce a variety of physical phenomenons such as sound, light, electricity during shelf depreciation, pass through Measurement to shelf depreciation may be implemented to the detection of different physical phenomenons, more commonly used method for measurement of partial discharge have it is ultraviolet at As method, superfrequency method, pulse current method, supercritical ultrasonics technology etc., corona discharge is a kind of form of shelf depreciation, discharge pulse Frequency is lower, and strength of discharge is weaker, using the common ultraviolet image method of shelf depreciation and superfrequency method due to bandwidth and resolution ratio Limitation, substation and device context electromagnetic environment complex in addition, to detection of Corona Discharge/testing result still have compared with Big error.For the problem that the measurement and positioning of corona discharge, become the urgent need to resolve for ensureing power equipment safety stable operation.
Summary of the invention
The purpose of the present invention is the shortcomings to overcome prior art, propose the measuring device and use of a kind of corona current It carries out multiple spot corona current localization method, by measurement corona current in the high-frequency vector magnetic field that surrounding space generates, according to Relationship between Vector Magnetic Field and corona current is realized and is discharged over the ground the positioning of corona current and corresponding point electrode to multiple points, adopts The breakdown location of insulator arrangement is solved the problems, such as with contactless method.
The measuring device of a kind of corona current proposed by the present invention, which is characterized in that the device includes: based on tunnel magneto Magnetic field sensor unit, signal processing and the power supply unit of effect, signal output unit three parts;It is described to be imitated based on tunnel magneto The magnetic field sensor unit answered uses and surveys twin shaft arrow by two uniaxial tunnel magneto sensors with what orthogonal arrangement mode formed The magnetic field sensor in magnetic field is measured, two single-axis sensors of the magnetic field sensor unit for measuring respective sensitive axes side respectively Two magnetic-field measurement results are carried out Vector modulation, to obtain surveyed twin shaft magnetic field value by upward magnetic field;The magnetic field sensing The measuring signal of device unit is exported to the signal processing and power supply unit, and the signal processing and power supply unit are used for two Single-axis sensors output signal carries out difference and enhanced processing, and provides power supply needed for working sensor;The signal processing and The voltage signal of power supply unit is exported to the signal output unit, and the signal output unit is for output signal to be transmitted to External signal pickup assembly.
The present invention also proposes to carry out multiple spot corona current localization method using above-mentioned apparatus, which is characterized in that this method packet Include following steps:
1) multiple corona current measurement mechanisms composition array format is arranged in around tested corona discharging area;
2) when the pulse frequency of corona discharge keeps stablizing, each corona current measurement mechanism in array is to corona discharge The spatial high-frequency Vector Magnetic Field of peripheral region measures, and obtains under multiple groups discharge scenario corona current in surrounding space radiative collision The waveform of field is as calculating data;
3) setting corona current measurement mechanism select output voltage threshold value, judge each group calculate data voltage value whether Greater than threshold value, any peak value output for the twin shaft Vector Magnetic Field that corona current measurement mechanism is measured is greater than the calculating number of this threshold value According to the output result as the measuring device for calculating;
4) denoising is carried out using measured waveform of the Wavelet noise-eliminating method to the output of the measuring device, and in array The peak magnetic field measurement result of each device is averaged, and the high-frequency vector magnetic field value that corona discharge is generated in surrounding space is obtained;
5) the magnetic field H obtained by the magnetic field sensor unit measurement result of measuring devices multiple in arraydischargeSide To the position of each corona point is calculated;
6) measurement result of the corona current measurement mechanism each in the array to same group of corona discharge handle To region of discharge, takes the center of gravity of region of discharge as the point of discharge being calculated, complete the positioning measurement of multiple corona discharges.
The principle of the present invention: the high-frequency current pulse signal that space shelf depreciation generates, will be in its week during wandering High-frequency electromagnetic pulse signal is formed in the near-field space enclosed, and there are strong correlations for signal strength and space partial discharge position Property.By the high-frequency electromagnetic pulse signal in detection discharge equipment near-field space, the extraction and identification of signal characteristic quantity are carried out, it can To realize effective detection of apparatus local discharge.
The features of the present invention and beneficial effect are:
Ambient noise biggish spy when the present invention fully takes into account the small range, wide bandwidth and measurement of corona discharge current Point, using the high sensitivity, broadband, intrinsic noise of tunnel magneto sensor are smaller, anti-electromagnetic interference capability is strong, it is unidirectional to exist Measurement sensitive axes advantage, realize accurate measurement to high-frequency vector magnetic field.To the magnetic-field measurement knot after progress signal denoising Fruit carries out corresponding location Calculation, obtains the position of corresponding source of high frequency current.The installation site of tunnel magneto sensor can be more Add flexible, unrestricted, while sensor also has sensibility to extraneous magnetic field angle, therefore can pass through multiple groups tunnel magneto Reasonable Arrangement and cooperation of the magnetic field sensor on the partial discharge device space position of space, utilize signal strength and space partial discharge position Strong correlation, realize the accurate positioning of multiple shelf depreciations inside equipment.The result can determine multiple corona discharges substantially The position of point, i.e. equipment generation insulation defect.
The present invention provides the new method that magnetic field and current measurement are carried out in extreme electromagnetic environment based on magnetic measurement, solutions The problem of corona current that apparatus insulated defect can not be generated by having determined is accurately positioned, greatly improves extreme electromagnetism ring The stability and precision of magnetic field and current measurement under border improve stability operation and the dielectric level of power grid.
Detailed description of the invention
Fig. 1 is the measuring device schematic diagram of corona current of the invention.
Fig. 2 is the citation form of corona current between the point pole and plate electrode used in the present invention, around point electrode When electric field is pole non-uniform field, corona current is resulted between point electrode and plate electrode.
Fig. 3 is the overall procedure block diagram of the method for the present invention
Fig. 4 is the location algorithm schematic diagram of each corona point position of this method.
Specific embodiment
A kind of measuring device of corona current proposed by the present invention and multiple spot corona current localization method is carried out with it, in conjunction with Accompanying drawings and embodiments are described as follows:
The present invention proposes a kind of measuring device of corona current, such as schemes shown in (1), which includes being imitated based on tunnel magneto Magnetic field sensor unit, signal processing and the power supply unit answered, signal output unit three parts;It is described to be based on tunnel magneto effect Magnetic field sensor unit, use and survey twin shaft vector by two uniaxial tunnel magneto sensors with what orthogonal arrangement mode formed The magnetic field sensor in magnetic field, two single-axis sensors of the magnetic field sensor unit are for the respective sensitive axis direction of measurement respectively On magnetic field, two magnetic-field measurement results are subjected to Vector modulations, to obtain surveyed twin shaft magnetic field value;The magnetic field sensor The measuring signal of unit is exported to the signal processing and power supply unit, poor for carrying out to two single-axis sensors output signals Point and enhanced processing, and provide power supply needed for working sensor, the signal and power supply unit are wider than the difference of 30MHz by band Operational amplifier AD8044 and Voltage Reference source chip LM7805, LM7905 composition;The electricity of the signal processing and power supply unit Pressure signal is exported to the signal output unit, and the output signal of device is exported extremely by the SMA mouth of corona current measurement mechanism BNC line, and external signal pickup assembly is transmitted a signal to, the signal pickup assembly can be oscillograph or capture card, It is not belonging to the component of the present apparatus.
The present invention proposes the method for carrying out the positioning of multiple spot corona current using the corona current measurement mechanism, mainly for The electric discharge of corona pulse appeared in electrical equipment carries out location Calculation, in embodiments of the inventive method, using point electrode The form of plate electrode electric discharge simulates the corona pulse electric discharge in equipment, illustrates the implementation method of corona current positioning. The experiment scene of the present embodiment indicates a point electrode 1 to the discharge type of plate electrode 3, when in point electrode 1 as shown in figure (2) When upper application high voltage, extremely non-uniform form will be presented in the electric field around point electrode 1, and corona current 2 results from point electrode 1 Between plate electrode 3.It is as shown in Figure 3 for the method flow of the multiple spot corona current positioning of the scene, comprising the following steps:
1) multiple corona current measurement mechanisms composition array format is arranged in around tested corona discharging area;Using more A corona current measurement mechanism composition array format based on tunnel magneto effect is to the space around multiple spot over the ground corona discharge Magnetic field measures, to reduce measurement error caused by corona discharge randomness.The length of general array is not in practical applications It can exceed that 20cm, in the present embodiment, each array is made of five corona current measurement mechanisms at the arrangement of equidistant straight line, battle array The spacing of each corona current measurement mechanism is 5cm in column.When actually determining the spacing of measuring device, can qualitatively judge first The corona discharge intensity of detection zone, if corona point, relative to more than the present embodiment and intensive, while region of discharge is greater than this Region of discharge in embodiment can then reduce the spacing of corona current measurement mechanism between 2-4cm, while using more than two Array format measure, otherwise can increase the spacing of corona current measurement mechanism between 6-8cm, while only with one Array measures.The signal processing and power supply unit and signal output unit of five corona current measurement mechanisms work independently. In measurement process, the array arrangement other than plate electrode 3, and in plate electrode 3 above the horizontal plane and 2 horizontal plane of point electrode Position below, i.e. array arrangement are insulated in corona discharge peripheral region with reducing corona discharge to corona current measurement mechanism Interference of the measuring device to corona discharge is eliminated in the influence of performance;
2) each corona current measurement mechanism in array carries out the spatial high-frequency Vector Magnetic Field of corona discharge peripheral region Measurement obtains under multiple groups discharge scenario corona current in the waveform of surrounding space radiation field;When the pulse frequency of corona discharge When keeping stablizing, corona pulse is measured;In the present embodiment point electrode to plate electrode using same discharge pulse into Row triggering, obtains the output waveform of each corona current measurement mechanism in array under synchronization, the result as one group of electric discharge.It is right Discharge pulse is repeatedly triggered, and obtains the waveform of multiple groups electric discharge as calculating data;
3) to avoid the biggish calculating error as caused by ambient noise in smaller output, setting corona current is surveyed Measure the threshold value of device selection output voltage, the threshold value of the present embodiment is taken as 10mV, judge each group calculate data voltage value whether Greater than threshold value, the output of measuring device twin shaft is respectively less than the calculating rejection of data equal to threshold value, corona current measurement mechanism is surveyed Any peak value output of the twin shaft Vector Magnetic Field obtained is greater than output knot of the one group of calculating data of this threshold value as the measuring device Fruit is for calculating;
4) corona current measurement mechanism is carried out at denoising using the measured waveform that Wavelet noise-eliminating method exports it Reason, and be averaged to the peak magnetic field measurement result of device each in array, obtain the height that corona discharge is generated in surrounding space Frequency Vector Magnetic Field value;This method embodiment uses the method for Wavelet Denoising Method to the original measurement of each corona current measurement mechanism of array Signal carries out denoising, and selected small echo is db4, and wavelet series are selected according to the sample rate in actual measurement, it is contemplated that The dominant frequency component of corona current is in 30MHz hereinafter, afterbody spatial frequency range when therefore Wavelet Denoising Method is at least answered Greater than 30MHz.Response using the signal peak after Wavelet Denoising Method as the surveyed magnetic field pulse of measuring device, will be each in array The multiple groups corona pulse response handled under a same corona discharge for single-axis sensors carries out that average (present invention is Carried out in the surveyed lesser situation of corona current surrounding magnetic field, ignore the influence of single-axis sensors cross sensitivity axis sensitivity), Directly using the twin shaft output voltage that corona current measurement mechanism obtains as twin shaft magnetic field value;
5) the magnetic field H obtained by multiple magnetic field sensor unit measurement resultsdischargeDirection, can be calculated The positioning of each corona point position;The location algorithm of the present embodiment is as shown in figure (3).According to maxwell equation group, reason Generating magnetic field by upper corona current should be perpendicular to measurement point and the line of point of discharge, to each 4 edge of corona current measurement mechanism Measurement point and point of discharge it is tangential, such as H in figuredischargeIt is shown.HdischargeTwo component HxAnd HyRespectively by magnetic field sensor Sensor measurement on two quadrature axis of unit obtains.In figureAngle is HdischargeWith HyAngle, can directly pass through electricity The twin shaft output voltage of corona current measuring device obtains, it may be assumed that
6) calculated result of comprehensive each point obtains the region of discharge of multiple corona points: by corona electricity each in the array Flow measuring apparatus, which handles the measurement result of same group of corona discharge, (is converted into single-point meter multiple spot corona location Calculation It calculates, realizes the simplification of calculating);Region of discharge that the measurement of comprehensive multiple corona current measurement mechanisms obtains is (due to can in measuring There can be error, the measurement result of all corona current measurement mechanisms can not may pass through just point of discharge, but pass through meter Calculation obtains multiple region of discharges), it takes the center of gravity of region of discharge as the point of discharge being calculated, completes determining for multiple corona discharges Position measurement.
In step (5), a polygonal region can be obtained according to corona current measurement mechanism measurement result under normal circumstances, This polygonal region contains the radial line that each measuring device in array is calculated, if forming polygonal region cannot wrap Containing all radial line, then the region of discharge for selecting the region comprising most a plurality of radial line to obtain as solution, and take the region Center of gravity as the corona point being calculated.
Polygonal region obtained in the step (5), the polygonal region contain each measuring device in array The radial line being calculated, if forming polygonal region cannot include all radial line, selection includes most a plurality of radial line Region as the obtained region of discharge of solution, and take the center of gravity in the region as the corona point being calculated.
By the magnetic field measuring device based on tunnel magneto effect, using array format to multiple spot over the ground corona discharge around Space magnetic field measure, record the obtained peak magnetic field of sensing device array measurement under multiple groups discharge scenario.Measurement process In, the sensor array is arranged in the peripheral region that multiple spot discharges over the ground, to reduce corona discharge to measuring device insulating properties The influence of energy, eliminates interference of the measuring device to corona discharge, and measuring device should be arranged in other than region of discharge or plate electrode.When When the pulse frequency of corona discharge keeps stablizing, corona pulse is measured, same discharge pulse is triggered, is obtained To the multiple groups output waveform of synchronization lower sensor array.To reduce measurement error caused by corona discharge randomness, with two For the measurement of point breakdown location, five double-shaft sensors are at least used in each array, while under each array arrangement Measure at least five groups of corona pulses.
(1) smaller apart from response of the farther away sensor of point of discharge for magnetic field of discharging, to avoid in smaller output situation Under the biggish calculating error as caused by ambient noise, need the sensor big to magnetic responsiveness to export and select.Setting passes The selection threshold value of sensor output uses this group of sensor in the case where any output of double-shaft sensor is all larger than this threshold value Output result calculated.
(2) denoising is carried out to the measured waveform of the magnetic field measuring device array, to the magnetic field of device each in array Peak value measurement result is averaged, and the high-frequency vector magnetic field value that corona discharge is generated in surrounding space is obtained.Using Wavelet Denoising Method Method denoising is carried out to the raw measured signal of each sensor, selected denoising small echo is db4, wavelet series in this method It is selected according to the sample rate in actual measurement, it is contemplated that the dominant frequency component of corona current is in 30MHz hereinafter, therefore small Afterbody spatial frequency range when wave denoises at least should be greater than 30MHz.In calculating later, after Wavelet Denoising Method Response of the signal peak as the surveyed magnetic field pulse of sensor, by the multiple groups electricity of single-axis sensors each in the sensor array Corona impulse response value is averaged, and in the surveyed lesser situation of corona current surrounding magnetic field, ignores single-axis sensors friendship The influence for pitching sensitive axes sensitivity, directly using the magnetic field composite result of two single-axis sensors as twin shaft magnetic field value.
It (3) is wire current model by corona current model simplification, according to maxwell equation group, theoretically corona current is produced Magnetisation field, that is, along the tangential of measurement point and point of discharge, should be obtained perpendicular to measurement point and the line of point of discharge by measurement result Magnetic direction and corresponding radial, the position of point of discharge can be calculated.
Double-shaft sensor each in the sensor array handles the measurement result of same group of corona discharge, obtains Double-shaft sensor measures multiple point of discharge positions under same array format, integrates the measurement result of multiple double-shaft sensors, Since, there may be error, the measurement result of all double-shaft sensors can not may pass through just point of discharge in measurement, but Multiple region of discharges are obtained by calculation, takes the center of gravity of region of discharge as the point of discharge being calculated, completes multiple coronas and put The positioning measurement of electricity.
Point electrode in the embodiment of the present invention is the basic of electrical equipment corona discharge to the corona discharge form of plate electrode Model, therefore device and method of the present invention is equally applicable to the corona discharge positioning in practical electrical equipment.

Claims (1)

1. a kind of measuring device using corona current carries out multiple spot corona current localization method, which includes: based on tunnelling Magnetic field sensor unit, signal processing and the power supply unit of magnetoresistance, signal output unit three parts;It is described to be based on tunnelling magnetic The magnetic field sensor unit of inhibition effect uses double with surveying of forming of orthogonal arrangement mode by two uniaxial tunnel magneto sensors Two single-axis sensors of the magnetic field sensor in axial vector magnetic field, the magnetic field sensor unit are respectively sensitive for measurement respectively Two magnetic-field measurement results are carried out Vector modulation, to obtain surveyed twin shaft magnetic field value by the magnetic field in axis direction;The magnetic field The measuring signal of sensor unit is exported to the signal processing and power supply unit, the signal processing and power supply unit for pair Two single-axis sensors output signals carry out difference and enhanced processing, and provide power supply needed for working sensor;At the signal The voltage signal of reason and power supply unit is exported to the signal output unit, and the signal output unit is for passing output signal Transport to external signal pickup assembly;
It is characterized in that, method includes the following steps:
1) multiple corona current measurement mechanisms composition array format is arranged in around tested corona discharging area;
2) when the pulse frequency of corona discharge keeps stablizing, each corona current measurement mechanism in array to corona discharge around The spatial high-frequency Vector Magnetic Field in region measures, and obtains under multiple groups discharge scenario corona current in surrounding space radiation field Waveform is as calculating data;
3) setting corona current measurement mechanism selects the threshold value of output voltage, judges whether the voltage value of each group calculating data is greater than Threshold value, the calculating data that any peak value output for the twin shaft Vector Magnetic Field that corona current measurement mechanism is measured is greater than this threshold value are made It is the output result of the measuring device for calculating;
4) denoising is carried out using measured waveform of the Wavelet noise-eliminating method to the output of the measuring device, and is respectively filled in array The peak magnetic field measurement result set is averaged, and the high-frequency vector magnetic field value that corona discharge is generated in surrounding space is obtained;
5) the magnetic field H obtained by the magnetic field sensor unit measurement result of measuring devices multiple in arraydischargeDirection, The positioning of each corona point position is calculated;
6) corona current measurement mechanism each in the array handles the measurement result of same group of corona discharge Region of discharge takes the center of gravity of region of discharge as the point of discharge being calculated, completes the positioning measurement of multiple corona discharges.
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