CN107356837A - A kind of improved reactor interturn short circuit fault detection recognition method - Google Patents
A kind of improved reactor interturn short circuit fault detection recognition method Download PDFInfo
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- G—PHYSICS
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention provides a kind of improved reactor interturn short circuit fault detection recognition method, using a kind of detection recognition method based on detection of magnetic field；Search coil is installed on the surface of reactor, whether the change of the voltage difference sensed by monitoring search coil in real time is abnormal come real-time judge reactor surrounding magnetic field, the voltage sample value U of search coil sensingjObtained by central slide averaging method, detection signal and normal signal, which make the difference, draws E >=k σ, k=3~5, and as k >=3, shorted-turn fault occurs.Fault pre-alarming promptly and accurately and alarm of the reactor interturn short circuit fault in the early stage with period of expansion can be realized using the technical program.
Description
Technical field
The present invention relates to a kind of field of inductor turn-to-turn fault detection, in particular to a kind of improved reactor turn-to-turn are short
Road fault detect recognition methods.
Background technology
Dry-type air-core reactor plays compensating power, limiting short-circuit current in power system, filters out higher hamonic wave
It is one of important power equipment of power system Deng effect, is usually applied to open air.Because operating mode is severe, Frequent Accidents, and circle
Between short trouble frequency account for more than the 50% of the total frequency of dry-type air-core reactor failure, if cannot arrange in time
Remove, reactor can directly be burnt and cause power outage by localized hyperthermia caused by short circuit current, have a strong impact on power system
Stable operation.Therefore effective detection shorted-turn fault is the key for ensureing dry-type air-core reactor stable operation.
Currently for dry-type air-core reactor shorted-turn fault, the detection method used both at home and abroad has：Turn-to-turn insulation is examined
Survey method and power direction detection method.Wherein the former be a kind of off-line type inspect periodically, Forecasting Methodology, preventive trial system is basic
Equipment normal operation during testing twice can be ensured, but it there are three defects：The economic loss brought due to stoppage in transit；Offline examination
Test situation when can not accurately reflect equipment operation；Experiment has certain destructiveness, shortens the service life of equipment.The latter
The occasion for serious shorted-turn fault hidden danger occur is mainly suitable for, but sensitivity is insufficient, can not detect a small number of circle short circuits, i.e., it is light
Micro- turn-to-turn short circuit.Therefore the traditional detection method of dry-type air-core reactor shorted-turn fault to initial stage of shorted-turn fault and
The degree of accuracy and under-sensitive be present when being detected in a small number of turn-to-turn short circuits.
Dry-type air-core reactor can produce symmetrical magnetic field around it in normal operation, once circle occurs
Between short trouble, there are one or several voluntarily to close the generation of the short-circuited conducting sleeve of sum in reactor, will have very in short-circuit ring coil
Big induced-current by and be reacted in the voltage waveform that search coil induces.Caused magnetic field can offset portion in short-circuited conducting sleeve
The magnetic field divided under normal condition, so as to destroy the symmetry of electric reactor magnetic field.In order to detect the change in magnetic field, in the table of reactor
Face is installed by symmetrically placed a pair or some to search coil, the change of the voltage difference by monitoring the sensing of each pair search coil in real time
Change and whether extremely to carry out real-time judge reactor surrounding magnetic field, so as to realize to the real-time of dry-type air-core reactor shorted-turn fault
On-line checking.Position electromagnetic field change is induced by search coil, induced signal u, table are exported in a manner of voltage signal
It is as follows up to formula：
In formula：S is the sectional area of coil；B (t) is that the space magnetic of reactor is close；For magnetic flux；N is search coil
The number of turn.
From above formula, induced voltage u and in the unit interval magnetic flux B change it is directly proportional, for normal operating mode 50Hz
For, the u values are little and more stable, but for the flux change of turn-to-turn short circuit transient state, because action time is very short, meeting
10 can be improved by producing the u of transient state change1~103More than times, the voltage signal change of pulse property is formed, based on u variation abnormalities
Signal recognition, reliably can evaluate and determine whether there occurs turn-to-turn short circuit inside reactor.
Search coil senses during reactor normal work differential signal is simultaneously not zero, but one has certain amplitude
Moment occurs for sinusoidal signal, failure, and the high fdrequency component of differential voltage can be clearly detected, but it is short that slight turn-to-turn occurs
During the failure of road, due to the influence of interference signal and sampling error, still directly using the high fdrequency component come failure judgement can produce compared with
Big error.
The content of the invention
It is an object of the invention to overcome above-mentioned deficiency of the prior art, on the basis of detection of magnetic field method, it is proposed that
A kind of improved reactor interturn short circuit fault detection recognition method, carry out smooth sampled data by using slip average first,
Further according to limits of error threshold Controlling model come judge whether occur turn-to-turn fault, realize reactor interturn short circuit fault in the early stage and
The on-line monitoring of period of expansion and fault pre-alarming promptly and accurately.
In order to solve the above-mentioned technical problem, the invention provides a kind of improved reactor interturn short circuit fault detection identification
Method, employ a kind of detection recognition method based on detection of magnetic field；
Inner surface is encapsulated in the innermost layer of reactor or symmetrically placed a pair or some are installed in outermost layer encapsulating outer surface
To search coil, the change of the voltage difference sensed by monitoring each pair search coil in real time is come real-time judge reactor surrounding magnetic field
It is whether abnormal, so as to realize the real-time online detection to reactor interturn short circuit fault；Specifically include following steps：
First, filtered data value is obtained using central slide averaging method；
The voltage sample value of search coil sensing is designated as Uj, sampled value carry out N points it is smooth after data value it is true by formula (1)
It is fixed,
In formula：N is that the statistical sample of mean value computation is counted, N=4,6 ...；
Wherein Udav(Ui, N) and it is the voltage sample value U that search coil sensesjFiltered data value after N points are smooth, i.e.,
I-th point of filtered numerical value is formed for the preceding N/2 sampled data of the point and the average of rear N/2 sampled data；
Secondly, characteristic signal used in fault detect is to use the signal crossed through central slide averaging method optimization processing,
The statistical sample points N of selection is 3, and it is M to remember filtered signal；The detection signal makes the difference with normal signal, and note deviation is
Δ S, note normal signal are MN；
Δ S=M-MN (2)
N in formula1Value algorithm it is as follows：
Use NsTo represent the waveform between crest and trough,
In formula：T is the primary signal cycle；fsamFor specimen sample frequency；F is primary signal intrinsic frequency, the frequency of signal
For 50Hz, therefore formula (4) is rewritten into：
Ns=0.01fsam (5)
Use NSCentral slide averaging method is done to Δ S, obtained：
By a decile of sine wave 6, the smooth point in formula (3) is used as by the use of the average queue length for covering such a section
Number, generate the central slide average of normal signal：
Finally, MS absolute value is taken, is designated as absolute deviation E, E is distributed across one of amplitude higher than " 0 " under normal circumstances
Belt-like zone, when there is turn-to-turn short circuit, E has a larger value；
Based on error theory, its variances sigma is calculated according to absolute deviation E, obtains reactor in normal conditions most
The deviation distribution limit threshold of maximum probability；According to 3 σ rules of error analysis,
The Alarm of shorted-turn fault is expressed as：
E3k σ, k=3~5 (8)
As k >=3, shorted-turn fault occurs.
Compared to prior art, technical scheme possesses following beneficial effect：
The invention provides a kind of improved reactor interturn short circuit fault detection recognition method, by using slip average
Carry out smooth sampled data, further according to limits of error threshold Controlling model judge whether that turn-to-turn fault occurs, realize reactor turn-to-turn
The short trouble fault pre-alarming promptly and accurately with period of expansion in the early stage.
Reactor interturn short circuit event can be built based on this improved reactor interturn short circuit fault detection recognition method
Hinder online monitoring system；Existing reactor arrangement and its peripheral equipment operation will not be influenceed by the system, and compatibility is good；
It can also be integrated by soft and hardware system altitude, realize working condition, stability and peace in master control room remote monitoring reactor
Quan Xing, it can be advantageous to ensure safe operation of electric network with early warning early stage and alarm for reactor interturn short circuit fault.
Embodiment
Hereafter with embodiment, the present invention will be further described.
A kind of improved reactor interturn short circuit fault detection recognition method, employs a kind of detection based on detection of magnetic field
Recognition methods.
Dry-type air-core reactor can produce symmetrical magnetic field around it in normal operation, once circle occurs
Between short trouble, there are one or several voluntarily to close the generation of the short-circuited conducting sleeve of sum in reactor, will have very in short-circuit ring coil
Big induced-current by and be reacted in the voltage waveform that search coil induces.Caused magnetic field can offset portion in short-circuited conducting sleeve
The magnetic field divided under normal condition, so as to destroy the symmetry of electric reactor magnetic field.
In order to detect the change in magnetic field, inner surface or outermost layer encapsulating outer surface installation pair are encapsulated in the innermost layer of reactor
Claim the change for a pair or some voltage differences to search coil, sensed by monitoring each pair search coil in real time placed come in real time
Judge whether reactor surrounding magnetic field is abnormal, so as to realize the real-time online detection to reactor interturn short circuit fault；Specific bag
Include following steps：
First, filtered data value is obtained using central slide averaging method；
The sample objects that magnetic field detecting coil obtains, it is the voltage signal that a kind of fundamental wave is 50Hz, when turn-to-turn short circuit occurs
High-frequency signal and interference signal difference be 3 aspect.First, interference burr occurs mainly in the Wave crest and wave trough position of waveform
Put, and short-circuit high-frequency signal is then the optional position for being randomly occurring in waveform；Secondly, the data point in burr is disturbed generally with this
Distribution symmetrical above and below centered on data point in moment normal waveform；Finally, although fault-signal and interference signal relative to
50Hz fundamental signal shows as high-frequency signal, but the former amplitude is significantly greater than the latter.For These characteristics, the present invention borrows
Conventional slip smooth median filter of having reflected is smoothly tactful.
First, the problem of waveform after traditional slipping smoothness mean filter is present smoothly lags with respect to actual waveform, it is former
Because being that the current smooth data value at each moment is made up of the average of N number of data point before the moment.In order to eliminate
Hysteresis on this waveform, we improve original algorithm using central slide averaging method, and the voltage of search coil sensing is adopted
Sample value is designated as Uj, sampled value carry out N points it is smooth after data value by formula (1) determine,
In formula：N is that the statistical sample of mean value computation is counted, N=4,6 ...；
Wherein Udav(Ui, N) and it is the voltage sample value U that search coil sensesjFiltered data value after N points are smooth, i.e.,
I-th point of filtered numerical value is formed for the preceding N/2 sampled data of the point and the average of rear N/2 sampled data.
Because the essence of central slide averaging method is to average, therefore have for symmetrical interference data point good
Filtration result.In addition, for the sinusoidal voltage that sample objects are frequency 50Hz, N values determine the length of average queue, and N values are got over
Greatly, the smooth effect of overall waveform is better, but the distortion of signal is also more serious, and the sampled value after smoothing processing is close to 0；And N values
Count smaller, it is smooth after waveform closer to real primary signal, but smooth effect may be affected, therefore N values
It is determined that filter effect is played an important role.
Secondly, characteristic signal used in fault detect is to use the signal crossed through central slide averaging method optimization processing,
In order to reduce the distortion of signal, so the statistical sample points N selected is 3,
Made the difference with detection signal and normal signal, so when shorted-turn fault does not occur, acquired results are theoretically
0；When short circuit occurs, a difference will be obtained in theory, it is M to remember filtered signal；Note deviation is Δ S, and note normal signal is
MN, obtained by formula (3), thus by the judgment standard of problem from the curve that sine curve is changed into that a value is about " 0 ".
Δ S=M-MN (2)
N in formula1Value algorithm it is as follows：
Due to the change of reactor working condition and the objective reality of sampling error, there is also certain fluctuation in itself by Δ S
Property by Δ S, it is necessary to do central slide average value processing.The purpose of this smoothing processing is to obtain Δ S stable average, using its as
The benchmark that failure judgement occurs.Interference signal typically result in sinusoidal waveform sampling after occur in crest and wave trough position it is larger
Burr, therefore use NsTo represent the waveform between crest and trough,
In formula：T is the primary signal cycle；fsamFor specimen sample frequency；F is primary signal intrinsic frequency, the frequency of signal
For 50Hz, therefore formula (4) is rewritten into：
Ns=0.01fsam (5)
Use NSCentral slide averaging method is done to Δ S, obtained：
In order to retain the characteristic fluctuation of primary signal, by a decile of sine wave 6, with the average for covering such a section
Queue length generates the central slide average of normal signal as the smooth points in formula (3)：
Finally, MS absolute value is taken, is designated as absolute deviation E, due to the presence of sampling error, E is distribution under normal circumstances
It is higher than a ribbon region of " 0 " in amplitude.When there is turn-to-turn short circuit, E has a larger value, with the shape of step signal
Formula breaks through belt-like zone.
Based on error theory, its variances sigma is calculated according to absolute deviation E, obtains reactor in normal conditions most
The deviation distribution limit threshold of maximum probability.According to 3 σ rules of error analysis, the distribution of deviation under nominal situation can more than 3 σ limit thresholds
Energy property≤0.0026%, once this event occurs, the fluctuation being just not belonging under nominal situation, it may be possible to which abnormal data has
Turn-to-turn short circuit event occurs, its reliability >=99%；
The Alarm of shorted-turn fault is expressed as：
E3k σ, k=3~5 (8)
As k >=3, shorted-turn fault occurs.
The foregoing is only a preferred embodiment of the present invention, but the present invention design concept be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, using this design to the present invention carry out it is non-
Substantial change, belong to invade the behavior of the scope of the present invention.
Claims (1)
1. a kind of improved reactor interturn short circuit fault detection recognition method, it is characterised in that employ a kind of based on magnetic field spy
The detection recognition method of survey；
Inner surface is encapsulated in the innermost layer of reactor or symmetrically placed a pair or some to visiting are installed in outermost layer encapsulating outer surface
Test coil, by monitor in real time each pair search coil sense voltage difference change come real-time judge reactor surrounding magnetic field whether
It is abnormal, so as to realize the real-time online detection to reactor interturn short circuit fault；Specifically include following steps：
First, filtered data value is obtained using central slide averaging method；
The voltage sample value of search coil sensing is designated as Uj, sampled value carry out N points it is smooth after data value by formula (1) determine,
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In formula：N is that the statistical sample of mean value computation is counted, N=4,6 ...；
Wherein Udav(Ui, N) and it is the voltage sample value U that search coil sensesjFiltered data value after N points are smooth, i.e., i-th
The filtered numerical value of point is formed for the preceding N/2 sampled data of the point and the average of rear N/2 sampled data；
Secondly, characteristic signal used in fault detect is using the signal crossed through central slide averaging method optimization processing, is selected
Statistical sample points N be 3, it is M to remember filtered signal；The detection signal makes the difference with normal signal, and note deviation is Δ S,
Note normal signal is MN；
Δ S=M-MN (2)
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Use NsTo represent the waveform between crest and trough,
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In formula：T is the primary signal cycle；fsamFor specimen sample frequency；F is primary signal intrinsic frequency, and the frequency of signal is
50Hz, therefore formula (4) is rewritten into：
Ns=0.01fsam (5)
Use NSCentral slide averaging method is done to Δ S, obtained：
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Generate the central slide average of normal signal：
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Finally, MS absolute value is taken, is designated as absolute deviation E, E is distributed across the ribbon that amplitude is higher than " 0 " under normal circumstances
Region, when there is turn-to-turn short circuit, E has a larger value；
Based on error theory, its variances sigma is calculated according to absolute deviation E, obtains reactor in normal conditions most general
The deviation distribution limit threshold of rate；According to 3 σ rules of error analysis,
The Alarm of shorted-turn fault is expressed as：
E3k σ, k=3~5 (8)
As k >=3, shorted-turn fault occurs.
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| CN109375076A (en) * | 2018-11-28 | 2019-02-22 | 周超超 | A kind of on-line monitoring method for dry-type air-core reactor turn-to-turn insulation failure |
| CN109470978A (en) * | 2018-11-09 | 2019-03-15 | 国网北京市电力公司 | Determine the method and device of the shorted-turn fault of reactor |
| CN109507558A (en) * | 2019-01-14 | 2019-03-22 | 广东电网有限责任公司 | A kind of turn insulation defect positioning method, the apparatus and system of coil with iron core |
| CN109901005A (en) * | 2019-02-25 | 2019-06-18 | 国网山东省电力公司济南供电公司 | Shorted-turn fault detection method, system and the application of axial magnetic field difference |
| CN114200303A (en) * | 2021-11-02 | 2022-03-18 | 华中科技大学 | Fault detection system based on detection coil group |
| CN116520196A (en) * | 2023-07-03 | 2023-08-01 | 国网安徽省电力有限公司电力科学研究院 | On-line monitoring method for turn-to-turn short circuit fault of dry type air-core reactor |
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| EP4450992A1 (en) * | 2023-04-18 | 2024-10-23 | HSP Hochspannungsgeräte GmbH | Method for monitoring an electrical device comprising at least one coil for winding short circuits, monitoring device, use and arrangement |
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