CN105891610B - A kind of stage division of transformer station's shelf depreciation live detection electromagnetic interference signal - Google Patents
A kind of stage division of transformer station's shelf depreciation live detection electromagnetic interference signal Download PDFInfo
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- CN105891610B CN105891610B CN201610194517.8A CN201610194517A CN105891610B CN 105891610 B CN105891610 B CN 105891610B CN 201610194517 A CN201610194517 A CN 201610194517A CN 105891610 B CN105891610 B CN 105891610B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0892—Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value
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- 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
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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Abstract
The invention discloses a kind of stage division of transformer station's shelf depreciation live detection electromagnetic interference signal, amplitude to all kinds of electromagnetic interference signals under various detection methods carries out statistic of classification, the basis of interference classification is used as by the use of interference signal intensity and its dispersion degree, objective and accurate carries out level of interference division to electromagnetic interference signal, quantitative describes electromagnetic interference signal, and reference frame is provided to standardize disturbed test platform and setting up local discharge detection device interference free performance evaluation system.
Description
Technical field
The present invention relates to electric power project engineering, more particularly to a kind of transformer station's shelf depreciation live detection electromagnetic interference signal
Stage division.
Background technology
Shelf depreciation live detection technology is the important technology support of Diagnostic Examination And Repair of Electric Power Facilities, is worked as to assessing power equipment
Preceding status level is significant.Have a power failure detection compared to tradition, it can realize that transformer pair is set in operating conditions
Standby state is effectively monitored, and timely discovering device defect eliminates the hidden danger existed, to avoiding equipment breakdown from having important valency
Value, is conducive to improving the reliability index of equipment.Current shelf depreciation live detection technology mainly has the inspection of superfrequency shelf depreciation
Survey, high frequency partial discharge examination, ultrasonic Partial Discharge Detection etc..These detection means are widely used in the part of transformer
In electric discharge live detection, and achieve good effect.But any local discharge detection device can be by each of transformer station
The influence of interference signal is planted, these interference may be from other discharge signals in fortune equipment in transformer station, it is also possible to from change
Communication signal or automobile motor signal outside power station, the antijamming capability of detection means are weigh device detection level one
Individual important parameter.
It is that the analogue means based on laboratory produces spy currently to local discharge detection device antijamming capability appraisal procedure
Can fixed nonadjustable interference signal, correctly recognize the particular interference signal as criterion according to device.This method is used
Interference signal it is single, can not accurate evaluation device comprehensively antijamming capability, may be to dress according to the difference of signal source
The antijamming capability put makes too high or too low judgement.Comprehensive and accurate local discharge detection device antijamming capability is assessed,
It should be the detection to device local discharge signal under the influence of the interference signal of different stage under standardization disturbed test platform
Assessed with recognition capability.The premise of assessment is that interference signal is classified according to certain standard, but at present for power transformation
Shelf depreciation of standing electromagnetic interference signal does not have stage division, setting and live detection instrument to test platform interference signal
The assessment of antijamming capability brings inconvenience.
In summary, a kind of standardization stage division of transformer station's shelf depreciation electromagnetic interference signal is set up, interference is surveyed
The signal for trying platform is set with the research of equipment anti-interference ability evaluation system with critical significance.
The content of the invention
The technical problem to be solved in the invention：Lack for existing transformer station's shelf depreciation electromagnetic interference signal stage division
The problem of mistake, a kind of stage division of electromagnetic interference signal is proposed, to standardize disturbed test platform and setting up shelf depreciation inspection
Survey device interference free performance evaluation system and reference frame is provided.
A kind of stage division of transformer station's shelf depreciation live detection electromagnetic interference signal, comprises the following steps：
Step 1：Gather electromagnetic interference signal during Partial Discharge Detection in transformer station；
The electromagnetic interference signal is in various exemplary voltages grades, Dian Xingwei using shelf depreciation live detection method
Put, under typical environment and operating mode in test transformer station local discharge signal white noise, preiodic type stepwise derivation signal, preiodic type
Pulse interference signal and stochastic pattern pulse interference signal；
The shelf depreciation live detection method includes high-frequency method, superfrequency method and transient earth voltage method；
A kind of electromagnetic interference signal quantity that test under every kind of shelf depreciation live detection method is obtained is at least above 100
It is individual；
Step 2：The electromagnetic interference signal that step 1 is obtained is counted, all kinds of electromagnetic interferences under each detection method are obtained
Sample of signal feature, includes the maximum V of electromagnetic interference signal samplemax, average value VaveAnd standard deviation sigma；
Step 3：Using class Gaussian Profile principle, the electromagnetic interference signal sample characteristics according to step 2 acquisition are to currently treating
The electromagnetic interference signal V of classification is classified：
As V≤VaveDuring -3 σ, current V belongs to I grades of interference, is considered as noiseless；
This interference signal intensity is much smaller than the average value of the type interference signal intensity；
Work as Vave- 3 σ ＜ V≤VaveDuring-σ, current V belongs to II grades of interference, is considered as slight interference；
This interference signal intensity is slightly less than the average value of the type interference signal intensity；
Work as Vave- σ ＜ V≤VaveFor when, current V belong to III level interference, be considered as intermediate disturbance；
This interference signal intensity is suitable with the type interference signal intensity average value；
Work as Vave＜ V≤VmaxWhen-σ is, current V belongs to IV grades of interference, is considered as severe interference；
This interference signal intensity is better than this type interference signal intensity average value；
Work as Vmax- σ ＜ V≤VmaxFor V grades when, current V belongs to V grades of interference and is considered as severe jamming.
This interference signal intensity is suitable with the type interference signal intensity maximum.
When being classified to current electromagnetic interference signal to be fractionated, used judge index be with it is currently to be fractionated
Electromagnetic interference signal used in detection method is identical and electromagnetic interference signal classification identical sample characteristics.
The grade classification principle being classified according to the electromagnetic interference signal, judges the level of interference belonging to the signal, accordingly
To judge whether the required instrument used possesses the electromagnetic interference signal for resisting the grade strength.
Beneficial effect
The invention provides a kind of stage division of transformer station's shelf depreciation live detection electromagnetic interference signal, to various inspections
The amplitudes of all kinds of electromagnetic interference signals under survey method carries out statistic of classification, by the use of interference signal intensity and its dispersion degree as
The basis of classification is disturbed, objective and accurate to carry out level of interference division to electromagnetic interference signal, quantitative describes electromagnetic interference
Level of signal, reference is provided to standardize disturbed test platform and setting up local discharge detection device interference free performance evaluation system
Foundation.
Its advantage is specific as follows：
1) interference signal intensity the essence of interference signal has been fully demonstrated into, at present as one of basis of interference classification
Most of live detection instrument is using signal intensity as criterion, and the recognition capability to varying strength interference signal is to weigh instrument
The key index of device interference free performance.
2) dispersion degree the random of same type signal amplitude has been taken into full account into as another basis of interference classification
Property and fluctuation, can more comprehensively, more rationally weigh instrument antijamming capability.
Brief description of the drawings
Fig. 1 is a kind of transformer station's shelf depreciation electromagnetic interference signal stage division flow chart of the present invention；
Fig. 2 is a kind of transformer station's shelf depreciation electricity of the present invention based on interference signal intensity and dispersion degree
Magnetic disturbance level of signal determines the schematic diagram of method.
Marginal data：1st, interference signal sample is collected；2nd, noise amplitudes characteristic statisticses；3rd, interference signal is classified.
Embodiment
Below in conjunction with drawings and examples, the present invention is described further.
As shown in figure 1, a kind of stage division of transformer station's shelf depreciation live detection electromagnetic interference signal, including following step
Suddenly：
Step 1：Gather electromagnetic interference signal during Partial Discharge Detection in transformer station；
The electromagnetic interference signal is in various exemplary voltages grades, Dian Xingwei using shelf depreciation live detection method
Put, under typical environment and operating mode in test transformer station local discharge signal white noise, preiodic type stepwise derivation signal, preiodic type
Pulse interference signal and stochastic pattern pulse interference signal；
The shelf depreciation live detection method includes high-frequency method, superfrequency method and transient earth voltage method；
A kind of electromagnetic interference signal quantity that test under every kind of shelf depreciation live detection method is obtained is at least above 100
It is individual；
Step 2：The electromagnetic interference signal that step 1 is obtained is counted, all kinds of electromagnetic interferences under each detection method are obtained
Sample of signal feature, includes the maximum V of electromagnetic interference signal samplemax, average value VaveAnd standard deviation sigma；
Step 3：Using class Gaussian Profile principle, the electromagnetic interference signal sample characteristics according to step 2 acquisition are to currently treating
The electromagnetic interference signal V of classification is classified, as shown in Figure 2：
As V≤VaveDuring -3 σ, current V belongs to I grades of interference, is considered as noiseless；
This interference signal intensity is much smaller than the average value of the type interference signal intensity；
Work as Vave- 3 σ ＜ V≤VaveDuring-σ, current V belongs to II grades of interference, is considered as slight interference；
This interference signal intensity is slightly less than the average value of the type interference signal intensity；
Work as Vave- σ ＜ V≤VaveFor when, current V belong to III level interference, be considered as intermediate disturbance；
This interference signal intensity is suitable with the type interference signal intensity average value；
Work as Vave＜ V≤VmaxWhen-σ is, current V belongs to IV grades of interference, is considered as severe interference；
This interference signal intensity is better than this type interference signal intensity average value；
Work as Vmax- σ ＜ V≤VmaxFor V grades when, current V belongs to V grades of interference and is considered as severe jamming.
This interference signal intensity is suitable with the type interference signal intensity maximum.
When being classified to current electromagnetic interference signal to be fractionated, used judge index be with it is currently to be fractionated
Electromagnetic interference signal used in detection method is identical and electromagnetic interference signal classification identical sample characteristics.
The grade classification principle being classified according to the electromagnetic interference signal, judges the level of interference belonging to the signal, accordingly
To judge whether the required instrument used possesses the electromagnetic interference signal for resisting the grade strength.
This example with using superfrequency method detect obtain preiodic type stepwise derivation signal, specifically using communicate interference signal as
Example, to illustrate the division of its level of interference.
The communication interference signal sample size collected in transformer station is 174, signal amplitude scope 1.3mV~51.5mV,
Statistics obtains maximum VmaxFor 51.5mV, average VaveFor 21.9mV, variances sigma is 5.2mV, the level of interference divided accordingly such as table
Shown in 1.
Table 1
It will detect that the electromagnetic interference signal intensity control above table obtained carries out level of interference division using superfrequency method,
Obtain electromagnetic interference signal grade under current state.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Illustrate, should be understood that the embodiment that the foregoing is only the present invention, the guarantor being not intended to limit the present invention
Scope is protected, within the spirit and principles of the invention, any modification, equivalent substitution for being made etc. should be included in the present invention
Protection domain within.
Claims (1)
1. a kind of stage division of transformer station's shelf depreciation live detection electromagnetic interference signal, it is characterised in that including following step
Suddenly：
Step 1：Gather electromagnetic interference signal during Partial Discharge Detection in transformer station；
The electromagnetic interference signal is in various exemplary voltages grades, exemplary position, allusion quotation using shelf depreciation live detection method
The white noise of local discharge signal, preiodic type stepwise derivation signal, preiodic type pulse in transformer station are tested under type environment and operating mode
Interference signal and stochastic pattern pulse interference signal；
The shelf depreciation live detection method includes high-frequency method, superfrequency method and transient earth voltage method；
A kind of electromagnetic interference signal quantity that test under every kind of shelf depreciation live detection method is obtained is at least above 100；
Step 2：The electromagnetic interference signal that step 1 is obtained is counted, all kinds of electromagnetic interference signals under each detection method are obtained
Sample characteristics, include the maximum V of electromagnetic interference signal samplemax, average value VaveAnd standard deviation sigma；
Step 3：Using class Gaussian Profile principle, the electromagnetic interference signal sample characteristics according to step 2 acquisition are to current to be fractionated
Electromagnetic interference signal be classified：
As V≤VaveDuring -3 σ, current V belongs to I grades of interference, is considered as noiseless；
Work as Vave- 3 σ ＜ V≤VaveDuring-σ, current V belongs to II grades of interference, is considered as slight interference；
Work as Vave- σ ＜ V≤VaveFor when, current V belong to III level interference, be considered as intermediate disturbance；
Work as Vave＜ V≤VmaxWhen-σ is, current V belongs to IV grades of interference, is considered as severe interference；
Work as Vmax- σ ＜ V≤VmaxFor V grades when, current V belongs to V grades of interference and is considered as severe jamming.
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| CN110636540B (en) * | 2019-09-19 | 2022-07-29 | 中国联合网络通信集团有限公司 | Network uplink interference pre-evaluation method and device |
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| CN203811750U (en) * | 2013-11-27 | 2014-09-03 | 云南电网公司保山供电局 | Live-line detection system for partial discharge of transformer |
| CN104459484B (en) * | 2014-11-13 | 2017-06-09 | 南方电网科学研究院有限责任公司 | The recognition methods of interference signal in a kind of live current conversion station maintenance factory building |
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