CN105022012B - The flickering accuracy checking method and system of digital electric power quality monitoring terminal - Google Patents
The flickering accuracy checking method and system of digital electric power quality monitoring terminal Download PDFInfo
- Publication number
- CN105022012B CN105022012B CN201410169142.0A CN201410169142A CN105022012B CN 105022012 B CN105022012 B CN 105022012B CN 201410169142 A CN201410169142 A CN 201410169142A CN 105022012 B CN105022012 B CN 105022012B
- Authority
- CN
- China
- Prior art keywords
- short term
- monitoring terminal
- quality monitoring
- electric power
- term flicker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 82
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000013075 data extraction Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 16
- 230000001131 transforming effect Effects 0.000 abstract description 9
- 238000005070 sampling Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 9
- 241000196324 Embryophyta Species 0.000 description 8
- 230000003247 decreasing effect Effects 0.000 description 7
- 238000009499 grossing Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 6
- 238000007689 inspection Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000001914 filtration Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 238000012806 monitoring device Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 241001165575 Hylotelephium telephium subsp. maximum Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 206010048669 Terminal state Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000013499 data model Methods 0.000 description 1
- 238000005315 distribution function Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The present invention, which provides a kind of flickering accuracy checking method of digital electric power quality monitoring terminal and system, this method, to be included：Sent to digital electric power quality monitoring terminal and meet the required standard signals of IEC61850 92；Described digital electric power quality monitoring terminal samples to described standard signal, and exports MMS messages；The minute data of Short Term Flicker index is determined according to described MMS messages；The Short Term Flicker measured value of the digital electric power quality monitoring terminal is determined according to the minute data of described Short Term Flicker index.Digital electric power quality monitoring terminal can be screened out whether according to IEC standard, accuracy of detection and dynamic flicker detection ability, easily and quickly the flicker test ability for digitizing transforming plant energy quality end can be assessed.
Description
Technical field
Detection technique of the present invention on the monitoring device in safe operation of power system, pacifies especially with regard to power system
The detection technique of complete operating transforming plant energy quality monitoring terminal, is concretely a kind of digital electric power quality-monitoring
The flickering accuracy checking method and system of terminal.
Background technology
In recent years, the demand of the digital number formula electric energy quality monitoring terminal of national each province is growing day by day, yet with
The level of the manufacturer of digital number formula electric energy quality monitoring terminal differs, the digital number formula quality of power supply prison of production
Survey terminal and be likely to occur the problems such as flicker detection algorithm is not according to national standard or inadequate measuring accuracy.
The detection of the flickering precision to digitizing digital electric power quality monitoring terminal is substantially in reality in the prior art
Room is tested by completing one by one by hand, and the manual inspection in laboratory can only be spot-check or transfer passage numerical value therein with computer,
The indices of packet can not be comprehensively checked, while also influence whether the true reflection of electric network terminal detection data.
At present, the domestic also not no flickering accuracy detection scheme on digital number formula electric energy quality monitoring terminal, IEC
Flickering standard simply show basic flicker test flow chart and general framework, not provide specific detection method.
Therefore, how the flickering precision to digital electric energy quality monitoring terminal detects, and lifts detection efficiency, ensures
The reliability of testing result, uniformity and the degree of accuracy that device is tested under complicated quality of power supply environment at the scene are improved, to realize
More inspections, fast inspection, excellent inspection are this area technical barriers urgently to be resolved hurrily.
The content of the invention
In order to solve caused by detecting the flickering precision of digital electric energy quality monitoring terminal one by one by hand in the prior art
The technical problem of electric network terminal detection data can not truly be reflected, the invention provides a kind of digital electric power quality monitoring terminal
Flickering accuracy checking method and system, can screen out digital electric power quality monitoring terminal whether according to IEC standard, inspection
Precision and dynamic flicker detection ability are surveyed, can be easily and quickly to digitizing the flickering of transforming plant energy quality end
Power of test is assessed.
It is an object of the invention to provide a kind of flickering accuracy checking method of digital electric power quality monitoring terminal,
Including：Sent to digital electric power quality monitoring terminal and meet IEC61850-9-2 required standard signals；Described is digital
Electric energy quality monitoring terminal samples to described standard signal, and exports MMS messages；Determined according to described MMS messages
The minute data of Short Term Flicker index；The digital electric power quality is determined according to the minute data of described Short Term Flicker index
The Short Term Flicker measured value of monitoring terminal.
It is an object of the invention to provide a kind of flickering accuracy detection system of digital electric power quality monitoring terminal
System, described system specifically include：Standard signal dispensing device, meet for being sent to digital electric power quality monitoring terminal
IEC61850-9-2 required standard signals；Described digital electric power quality monitoring terminal, for described standard signal
Sampled, and export MMS messages；Minute data determining device, for determining Short Term Flicker index according to described MMS messages
Minute data；Short Term Flicker measured value determining device, for determining institute according to the minute data of described Short Term Flicker index
State the Short Term Flicker measured value of digital electric power quality monitoring terminal.
The beneficial effects of the present invention are, there is provided a kind of flickering accuracy detection side of digital electric power quality monitoring terminal
Method and system, not only solve the manual flickering precision for detecting digital electric energy quality monitoring terminal one by one in the prior art and make
Into the true reflection for influenceing electric network terminal detection data technical problem, and digital electric power quality-monitoring can be screened out
Whether terminal, can be easily and quickly to Digitized transformation according to IEC standard, accuracy of detection and dynamic flicker detection ability
Stand and assessed with the flicker test ability of electric energy quality end.
For the above and other objects, features and advantages of the present invention can be become apparent, preferred embodiment cited below particularly,
And coordinate institute's accompanying drawings, it is described in detail below.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of flickering accuracy checking method of digital electric power quality monitoring terminal provided in an embodiment of the present invention
The flow chart of embodiment one；
Fig. 2 is a kind of flickering accuracy checking method of digital electric power quality monitoring terminal provided in an embodiment of the present invention
The flow chart of embodiment two；
Fig. 3 is the particular flow sheet of the step S203 in Fig. 2；
Fig. 4 is the particular flow sheet of the step S204 in Fig. 2；
Fig. 5 is a kind of flickering precision detection system of digital electric power quality monitoring terminal provided in an embodiment of the present invention
The structured flowchart of embodiment one；
Fig. 6 is a kind of flickering precision detection system of digital electric power quality monitoring terminal provided in an embodiment of the present invention
The structured flowchart of embodiment two；
Fig. 7 is in a kind of flickering precision detection system of digital electric power quality monitoring terminal provided in an embodiment of the present invention
The structured flowchart of minute data determining device 300；
Fig. 8 is in a kind of flickering precision detection system of digital electric power quality monitoring terminal provided in an embodiment of the present invention
The structured flowchart of Short Term Flicker measured value determining device 400；
Fig. 9 is flicker detection standard IEC 61000-4-15 overhaul flow chart；
When Figure 10 is not perfectly aligned there is the schematic diagram of interference in adjacent signals；
The schematic diagram of interference is not present in adjacent signals when Figure 11 is not perfectly aligned；
Figure 12 is the schematic diagram of standard signal output；
Figure 13 is standard signal instantaneous vermicularizing alloy Distribution value figure (10min)；
Figure 14 is standard signal virtual value distribution map (10min).
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
It is an object of the invention to provide the digital transformer substation use that a kind of undulate quantity based on IEC flickering standards is successively decreased step by step
The flickering accuracy checking method of electric energy quality monitoring terminal, digital transformer substation can be screened out and moved with electric energy quality monitoring terminal
State flicker detection ability.
Flicker detection standard IEC 61000-4-15 testing process is introduced first below.Flicker detection standard IEC 61000-
4-15 is the amplitude-modulated wave flickering model based on incandescent lamp ＆ lantern, and its flicker detection flow is as shown in Figure 9.Based on multiple amplitude-modulated wave flickerings
The IEC flickering signal general expressions of model are：
Wherein, A, ω represent the amplitude of work frequency carrier voltage, angular frequency, mf、ΩfAnd θfRepresent the width of each amplitude modulation wave voltage
Value coefficient, angular frequency and phase.
Flickering signal exports after square demod-ulation device：
Wherein, R (2 ω, Ωf) represent all frequency components related to 2 times of power frequencies.
The output signal of square demod-ulation device is after 0.05Hz~35Hz bandpass filters, DC component A2/ 2 and with 2 times of works
Frequency related frequency component R (2 ω, Ωf) will be filtered out.Demodulate cause flickering amplitude modulation wave component export be：
Signal v after 0.05~35Hz bandpass filters3-1(t) 8.8Hz weighted filterings are carried out again.Weight and filter from 8.8Hz
Ripple device come out signal be：
Wherein, Kf、RfFor the visual sense degree coefficient and form factor of corresponding amplitude modulation wave frequency rate.8.8Hz weighting filters output letter
Number v3(t) first it is multiplied by 1/A2Amplitude normalized is carried out, then passes through squarer.Single order smoothing filter is by the direct current of squarer
Signal is extracted.
Therefore, equivalent 8.8Hz sine modulations wave voltage undulating value square is：
Provided according to IEC standard, one caused by the sine modulation ripple that frequency is 8.8Hz and magnitude of a voltage fluctuation is 0.25%
Unit flickering, so instantaneous flicker PinstTheoretical calculation expression formula be：
Above formula shows the square proportional of instantaneous flicker value and magnitude of a voltage fluctuationSingle order smoothing filter
The gain coefficient K values that output result is converted to needed for instantaneous flicker value are：
IEC standard provides the statistical disposition to instantaneous flicker value：
1. in observation phase (10min), statistics instantaneous flicker value PinstResult of calculation, classification timing (be more than 64 grades).
2. the total time of instantaneous flickers at different levels is counted respectively, with TshortThe percentage of (10min) represents, calculates probability density
Function (PDF).
3. statistics is less than or equal to the total time of certain grade of instantaneous flicker value, with TshortThe percentage of (10min) represents, calculates tired
Count distribution function (CDF).
④P0.1、P1、P3、P10、P50For instantaneous flicker value of the cumulative probability more than 0.1%, 1%, 3%, 10%, 50%.
Pinst(t) arrange from small to large, choose 99.9%, 99%, 97%, 90%, the 50% big value of probability.Pinst(t) discrete series for etc.
Time interval, such as less than Pinst,NAll Pinst,iThe corresponding time accounts for the N% of whole observation phase, then not less than Pinst,NIt is all
Pinst,iNumber also account for P in the periodinst,iThe N%, i.e. P of suminst,NFor period Pinst(100-N%) of sequence is general
The big value of rate.
10min Short Term Flicker Severities (Pst)：
Wherein, P1s=(P0.7+P1+P1.5)/3, P3s=(P2.2+P3+P4)/3,
P10s=(P6+P8+P10+P13+P17)/5, P50s=(P30+P50+P80)/3。
It is IEC61000-4-15 flicker detection flows above.
A kind of particular flow sheet of the flickering accuracy checking method of digital electric power quality monitoring terminal proposed by the present invention
As shown in figure 1, as shown in Figure 1, in embodiment one, described method includes：
S101：Sent to digital electric power quality monitoring terminal and meet IEC61850-9-2 required standard signals.
Standard signal designed by the detection scheme of the present invention is considered to supervise for most domestic digital electric power quality
Terminal is surveyed, sampling initial time was sampled since whole minute, but due to the digital electric power quality monitoring terminal sampling time
The program control response time delay of asynchronous and standard source itself with the signal output of standard source, sampling period and output can be caused
Signal can not be perfectly aligned, so as to contain two signals within a sampling period, and ultimately results in the less letter of virtual value
Number leakage data adopting or adopt are unavailable, and adjacent signals have the schematic diagram of interference, Figure 11 when such as Figure 10 being not perfectly aligned
For it is not perfectly aligned when adjacent signals be not present interference schematic diagram.
To solve the above problems, in view of digital electric power quality monitoring terminal using record segment (such as 1 minute) by 3 seconds sides
Average is maximum, minimum, average to be recorded to 3, and desired detection signal is extracted using a kind of record segment maximum filtration method, its
It is mathematically represented as
In above formula, x1max…xkmax…xnmaxRepresent n 3 seconds in the minutes section of digital electric power quality monitoring terminal one
R.m.s. maximum, x1min…xkmin…xnminRepresent n 3 seconds r.m.s.s in digital electric power one minute section of quality monitoring terminal
Minimum value, xav…xkav…xnavRepresent n 3 seconds root-mean-square average values in digital electric power one minute section of quality monitoring terminal.
As long as the signal for being used for detection always occurs from the maximum of record segment, the detection sequence thus constructed just can be real
The automatic detection of existing continuous signal.Therefore, the numeral successively decreased step by step based on flickering undulate quantity that detection scheme of the invention proposes
The time span for changing the flickering precision signal of transforming plant energy quality monitoring terminal is 20 minutes.Like this, can do more
The flicker detection of group is tested, and is not interfere with each other between each group of signal.And no matter when monitoring terminal starts to sample, all can be complete
Collect 10 minutes flickering signals.
The present invention standard signal be：The fluctuation size of preceding 3.5% period is 0.25%, 8.8HZ sine modulation ripple；
The undulate quantity of following 7.5% period is8.8HZ sine modulation ripple；Ensuing 60% period
Undulate quantity isSine modulation ripple is 9.5HZ；The undulate quantity of last 29% period isSine is adjusted
The frequency of amplitude wave is 8.8HZ, totally four periods, 10 minutes, ensuing four periods repeated above for 10 minutes, mark
The length of calibration signal is 20 minutes.
Due to being the digital electric energy quality monitoring terminal of detection, therefore the form of standard signal should be met
IEC61850-9-2 requirements, in a particular embodiment, lattice are realized using the relay-protection tester of DRT-802 models
Formula is changed.
Figure 12 is the schematic diagram of standard signal output, as shown in Figure 12, first, the data that user data passes through DRT-802
Mouth is exchanged, into inside relay-protection tester.According to the routine data model of user set in advance, inside DRT-802
Model analyzing module generates conventional model data-interface, this interface the routine data of user is converted to that instrument can receive the
Three kinds of data formats.Then, the third data format, which turns into data mart modeling by mapping ruler, meets IEC61850-9-2's
Data format.Finally, the data set model required according to user, the data format for meeting IEC61850-9-2 is arranged, output
IEC61850-9-2 standard signal.
S102：Described digital electric power quality monitoring terminal samples to described standard signal, and exports MMS
(industrial manufacturing standard message) message.Standard signal reaches digital electric power quality monitoring terminal, digital after 20 minutes
After the completion of electric energy quality monitoring terminal sampling, standard is counted, and is exported after result is put into MMS messages.
S103：The minute data of Short Term Flicker index is determined according to described MMS messages.
S104：The digital electric power quality monitoring terminal is determined according to the minute data of described Short Term Flicker index
Short Term Flicker measured value.
Fig. 2 is a kind of flickering accuracy checking method of digital electric power quality monitoring terminal provided in an embodiment of the present invention
The flow chart of embodiment two, as shown in Figure 2, in embodiment two, this method specifically includes：
S201：Sent to digital electric power quality monitoring terminal and meet International Electrotechnical Commission IEC61850-9-2 requirements
Standard signal.The present invention standard signal be：The fluctuation size of preceding 3.5% period is 0.25%, 8.8HZ sine modulation
Ripple；The undulate quantity of following 7.5% period is8.8HZ sine modulation ripple；Ensuing 60% time
Section undulate quantity beSine modulation ripple is 9.5HZ；The undulate quantity of last 29% period isJust
The frequency of string amplitude-modulated wave is 8.8HZ, totally four periods, 10 minutes, ensuing four times repeated above for 10 minutes
Section, the length of standard signal is 20 minutes.
S202：Described digital electric power quality monitoring terminal samples to described standard signal, and exports MMS reports
Text.Standard signal reaches digital electric power quality monitoring terminal, after 20 minutes, the sampling of digital electric power quality monitoring terminal
After the completion of, standard is counted, and is exported after result is put into MMS messages.
S203：The minute data of Short Term Flicker index is determined according to described MMS messages.Fig. 3 is the specific of step S203
Flow chart, from the figure 3, it may be seen that the step specifically includes：
S301：The described MMS messages of parsing；
S302：The minute data of Short Term Flicker index is extracted in MMS messages after analytically.
As shown in Figure 2, in embodiment two, this method also includes：
S204：The digital electric power quality monitoring terminal is determined according to the minute data of described Short Term Flicker index
Short Term Flicker measured value.Fig. 4 is step S204 particular flow sheet, and as shown in Figure 4, the step specifically includes：
S401：First is extracted in Short Term Flicker theoretical value from the minute data of described Short Term Flicker index is not
Zero value；
S402：At the time of determining that first value being not zero corresponds to, referred to as the first moment；
S403：The first described moment was obtained into for the second moment plus 10 minutes；
S404：Determine Short Term Flicker measured value corresponding to second moment.Parse measured number formula electric energy quality monitoring
The Short Term Flicker value that is included of Short Term Flicker theory index inside the MMS messages that terminal returns, using the second described moment,
Short Term Flicker measured value corresponding to searching.
Go out the measured value of various index to MMS packet parsings by IEC61850 clients, such as, the frequency of return
The indexs such as rate, tri-phase unbalance factor, voltage, Short Term Flicker.Flickering standard signal proposed by the present invention, just should analytically go out
The measured value under Short Term Flicker index catalogue is found in message, without looking for these catalogues of frequency, three-phase imbalance.Measured value
It is not single, because it is made up of the minute data of continuous time, every the measured value that one minute just has a flickering, prison
The tables of data of a measurement will be formed through sampling after a while by surveying terminal.The survey of standard signal is found inside this table
Value, determine the first moment and the second moment.Short Term Flicker measured value corresponding to second moment is determined, as long as have found
It is two moment, one-to-one with the second moment with regard to that can find in the measurement table under the catalogue of the Short Term Flicker index of monitoring terminal
Short Term Flicker measured value, and this value is considered Short Term Flicker measured value of the electric energy quality monitoring terminal to standard signal.Numeral
The Short Term Flicker measured value of formula electric energy quality monitoring terminal is actual PstNValue.
As shown in Figure 2, in embodiment two, this method also includes：
S205：Obtain the Short Term Flicker theoretical value of the standard signal.Short Term Flicker theoretical value is standard Pst values.
Obtain the theoretical value of the standard detection signature.The theory introduced according to the present invention, provided according to IEC standard
Statistical formula calculates, the Short Term Flicker theoretical value (smoothing processing) of this detection signal：
Wherein, p0.1s=1, p1s=(p0.7+p1+p1.5)/3=p0.7=p1=p1.5=1
S206：Described Short Term Flicker theoretical value is compared with described Short Term Flicker measured value, obtains comparing knot
Fruit.S207：Judge whether described digital electric power quality monitoring terminal meets IEC standard according to described comparison result.
According to《Electric energy quality on-line monitoring device technical specification》(QGDW-10-J393-2009) flickering Pst specified in
The precision of value is the actual P of digital electric power quality monitoring terminal recordstNThe difference of value and standard Pst values is to the hundred of standard Pst values
Divide ratio, accuracy computation formula isThe precision of flickering Pst values is 5%, and the precision of standard source flickering is q%,
Revised error range isThe essence of standard source flickering
Spend for 5/100000ths, the i.e. actual P of digital electric power quality monitoring terminal recordstNThe difference of value and standard Pst values is to standard
The percentage of Pst values is between -5.00475% to+5.00525%, it is believed that the flickering of digital electric power quality monitoring terminal
Monitoring accuracy meets IEC standard.The instantaneous vermicularizing alloy Distribution value figure of flicker detection signal is as shown in figure 13, effective Distribution value
Figure is as shown in figure 14.
As above it is that the digital transformer substation provided by the invention to be successively decreased step by step based on flickering undulate quantity is supervised with the quality of power supply
The flickering accuracy checking method of terminal is surveyed, digital electric power quality monitoring terminal can be screened out whether according to IEC standard, detection
Precision and dynamic flicker detection ability, only need the detection signal of continually changing a undulate quantity and vibration frequency, it is possible to
Easily and quickly the flicker test ability for digitizing transforming plant energy quality end is assessed.
The present invention also proposes a kind of flickering precision detection system of digital electric power quality monitoring terminal, and Fig. 5 is the system
Embodiment one structured flowchart, as shown in Figure 5, in embodiment one, described system includes：
Standard signal dispensing device 100, meet IEC61850-9-2 for being sent to digital electric power quality monitoring terminal
Required standard signal.
Standard signal designed by the detection scheme of the present invention is considered to supervise for most domestic digital electric power quality
Terminal is surveyed, sampling initial time was sampled since whole minute, but due to the digital electric power quality monitoring terminal sampling time
The program control response time delay of asynchronous and standard source itself with the signal output of standard source, sampling period and output can be caused
Signal can not be perfectly aligned, so as to contain two signals within a sampling period, and ultimately results in the less letter of virtual value
Number leakage data adopting or adopt are unavailable, and adjacent signals have the schematic diagram of interference, Figure 11 when such as Figure 10 being not perfectly aligned
For it is not perfectly aligned when adjacent signals be not present interference schematic diagram.
To solve the above problems, in view of digital electric power quality monitoring terminal using record segment (such as 1 minute) by 3 seconds sides
Average is maximum, minimum, average to be recorded to 3, and desired detection signal is extracted using a kind of record segment maximum filtration method, its
It is mathematically represented as
In above formula, x1max…xkmax…xnmaxRepresent n 3 seconds in the minutes section of digital electric power quality monitoring terminal one
R.m.s. maximum, x1min…xkmin…xnminRepresent n 3 seconds r.m.s.s in digital electric power one minute section of quality monitoring terminal
Minimum value, xav…xkav…xnavRepresent n 3 seconds root-mean-square average values in digital electric power one minute section of quality monitoring terminal.
As long as the signal for being used for detection always occurs from the maximum of record segment, the detection sequence thus constructed just can be real
The automatic detection of existing continuous signal.Therefore, the numeral successively decreased step by step based on flickering undulate quantity that detection scheme of the invention proposes
The time span for changing the flickering precision signal of transforming plant energy quality monitoring terminal is 20 minutes.Like this, can do more
The flicker detection of group is tested, and is not interfere with each other between each group of signal.And no matter when monitoring terminal starts to sample, all can be complete
Collect 10 minutes flickering signals.
The present invention standard signal be：The fluctuation size of preceding 3.5% period is 0.25%, 8.8HZ sine modulation ripple；
The undulate quantity of following 7.5% period is8.8HZ sine modulation ripple；Ensuing 60% period
Undulate quantity isSine modulation ripple is 9.5HZ；The undulate quantity of last 29% period isSine is adjusted
The frequency of amplitude wave is 8.8HZ, totally four periods, 10 minutes, ensuing four periods repeated above for 10 minutes, mark
The length of calibration signal is 20 minutes.
Minute data determining device 200, for described digital electric power quality monitoring terminal to described standard signal
Sampled, and export MMS messages.Standard signal reaches digital electric power quality monitoring terminal, digital after 20 minutes
After the completion of electric energy quality monitoring terminal sampling, standard is counted, and is exported after result is put into MMS messages.
Minute data determining device 300, for determining the minute data of Short Term Flicker index according to described MMS messages.
Fig. 7 is the structured flowchart of minute data determining device 300, and as shown in Figure 7, minute data determining device 300 specifically includes：
Parsing module 301, for parsing described MMS messages；
Minute data extraction module 302, for extracting the number of minutes of Short Term Flicker index in the MMS messages after analytically
According to.
As shown in Figure 5, the system also includes：
Short Term Flicker measured value determining device 400, for determining institute according to the minute data of described Short Term Flicker index
State the Short Term Flicker measured value of digital electric power quality monitoring terminal.Fig. 8 is the structure of Short Term Flicker measured value determining device 400
Block diagram, as shown in Figure 8, Short Term Flicker measured value determining device 400 specifically include：
Extraction module 401, for extracting Short Term Flicker measurement from the minute data table of described Short Term Flicker index
First value being not zero in value；
First moment determining module 402, at the time of for determining that first value being not zero corresponds to, when referred to as first
Carve；
Second moment determining module 403, for plus 10 minutes to be obtained into the second moment the first described moment；
Short Term Flicker measured value determining module 404, for determining Short Term Flicker measured value corresponding to second moment, solution
The sudden strain of a muscle in short-term that the Short Term Flicker theory index inside MMS messages that analysis measured number formula electric energy quality monitoring terminal returns is included
Variate, using the second described moment, Short Term Flicker measured value corresponding to searching.
Go out the measured value of various index to MMS packet parsings by IEC61850 clients, such as, the frequency of return
The indexs such as rate, tri-phase unbalance factor, voltage, Short Term Flicker.Flickering standard signal proposed by the present invention, just should analytically go out
The measured value under Short Term Flicker index catalogue is found in message, without looking for these catalogues of frequency, three-phase imbalance.Measured value
It is not single, because it is made up of the minute data of continuous time, every the measured value that one minute just has a flickering, prison
The tables of data of a measurement will be formed through sampling after a while by surveying terminal.The survey of standard signal is found inside this table
Value, determine the first moment and the second moment.Short Term Flicker measured value corresponding to second moment is determined, as long as have found
It is two moment, one-to-one with the second moment with regard to that can find in the measurement table under the catalogue of the Short Term Flicker index of monitoring terminal
Short Term Flicker measured value, and this value is considered Short Term Flicker measured value of the electric energy quality monitoring terminal to standard signal.Numeral
The Short Term Flicker measured value of formula electric energy quality monitoring terminal is actual PstNValue.
Fig. 6 is a kind of flickering precision detection system of digital electric power quality monitoring terminal provided in an embodiment of the present invention
The structured flowchart of embodiment two, it will be appreciated from fig. 6 that in embodiment two, the system specifically includes：
Short Term Flicker theoretical value acquisition device 500, for obtaining the Short Term Flicker theoretical value of the standard signal, dodge in short-term
It is standard Pst values to become theoretical value.
Obtain the theoretical value of the standard detection signature.The theory introduced according to the present invention, provided according to IEC standard
Statistical formula calculates, the Short Term Flicker theoretical value (smoothing processing) of this detection signal：
Wherein, p0.1s=1, p1s=(p0.7+p1+p1.5)/3=p0.7=p1=p1.5=1
Comparison device 600, for described Short Term Flicker theoretical value to be compared with described Short Term Flicker measured value,
Obtain comparison result.
Judgment means 700, for judging that described digital electric power quality monitoring terminal is according to described comparison result
It is no to meet IEC standard.
According to《Electric energy quality on-line monitoring device technical specification》(QGDW-10-J393-2009) flickering Pst specified in
The precision of value is the actual P of digital electric power quality monitoring terminal recordstNThe difference of value and standard Pst values is to the hundred of standard Pst values
Divide ratio, accuracy computation formula isThe precision of flickering Pst values is 5%, and the precision of standard source flickering is q%,
Revised error range isThe essence of standard source flickering
Spend for 5/100000ths, the i.e. actual P of digital electric power quality monitoring terminal recordstNThe difference of value and standard Pst values is to standard
The percentage of Pst values is between -5.00475% to+5.00525%, it is believed that the flickering of digital electric power quality monitoring terminal
Monitoring accuracy meets IEC standard.The instantaneous vermicularizing alloy Distribution value figure of flicker detection signal is as shown in figure 13, effective Distribution value
Figure is as shown in figure 14.
As above it is a kind of flickering precision detection system of digital electric power quality monitoring terminal provided by the invention, can be with
Digital electric power quality monitoring terminal is screened out whether according to IEC standard, accuracy of detection and dynamic flicker detection ability, is only needed
The detection signal of one continually changing undulate quantity and vibration frequency, it is possible to easily and quickly to digitizing transforming plant
The flicker test ability of energy quality end is assessed.
With reference to specific embodiment, technical scheme is discussed in detail.
The critical function of digital electric power quality monitoring terminal exactly can accurately identify, monitor stable state and dynamic sudden strain of a muscle
Become, but for some domestic monitoring terminal manufacturing firms, not according to the specification testing process in IEC61000-4-15,
But use a kind of simple, approximation-average value statistics method.Instantaneous flicker value P is obtained by filtering linkinst(n) after, do not press
It is classified according to IEC standard, but substitutes into formula and obtain Short Term Flicker
So the flicker detection signal of technical scheme design, with the measurement of IEC methods and average value statistic law
As a result it is as shown in table 1 with relative error：
Table 1
It can be seen from Table 1 that：
1. average value statistics method error in stable state flicker test is only 0.32%, meet Standard (A level worst errors
± 5%, B level worst error ± 10%), it is almost equal with theoretical value.But the flicker detection of technical scheme design
Signal, the dynamic flickering signal that undulate quantity amplitude is successively decreased step by step, because all instantaneous flicker values are averaged by average value statistics method
Change so that its result reduces, and error has reached -39.86%；
2. the flicker detection signal of technical side's design of the present invention, can distinguish whether detection terminal is carried out smoothly well
Processing, the theoretical value (smoothing processing) of A phase test signals are equal with theoretical value (non-smoothing processing).Because the technical program designs
Flicker detection signal respectively 3.5%, 11%, 71% period undulate quantity be mutated, disturb p4、p13、p17、p80Value, make
There is big error in the theoretical value for obtaining non-smoothing processing.
The flicker detection signal of the technical program design, can also screen out and whether utilize virtual value method.It is so-called effective
Value method, it is exactly by u2(t) reference voltage A is subtracted2Integrated after/2, component of the frequency more than 2w can be ignored in integration, detect
The coefficient of the amplitude-modulated wave comeIts coefficient is no longer constant, but relevant with vibration frequency.Due to
The flickering value that the characteristic that the amplitude-modulated wave that virtual value method detects is decayed with wave characteristic will also make to calculate is with vibration frequency
Increase and decay, therefore, the flicker detection signal that present design proposes, within 11%---71% period, allow fluctuation frequently
Rate raises, and changes p30、p50, last Short Term Flicker theoretical value reduces.
In order to further verify the accuracy of technical solution of the present invention, IEC61000-4-15 is built using simulink and pushed away
The flickermeter model recommended, and the error of simulation model has been obtained, as shown in table 2.
Table 2
From table 2 it can be seen that the flickermeter models recommended of IEC can be detected and dynamic flickering with relatively good, miss
The reason for poor is probably that the cut-off frequency design of some wave filter in IEC models is improper so that wave filter is not up to preferable
State；From the point of view of the simulation result of virtual value, the characteristic that decays due to the amplitude-modulated wave that virtual value method detects with wave characteristic
The flickering value that will make to calculate decays with the increase of vibration frequency, therefore, the flicker detection signal that the present invention program proposes,
Within 11%---71% period, allow vibration frequency to raise, change p30、p50, last Short Term Flicker theoretical value reduces, tests
The flicker detection signal correctness of the technical program design is demonstrate,proved.
In order that the technical program more has autgmentability, the theory of several groups of typical flicker detection signals is given below
Value, table 3 is the typical five groups of detection signals of technical solution of the present invention：
Table 3
Next, the PQS-883 digital transformer substation qualities of power supply from Nanjing Shining Electric Power Automation Co., Ltd.
Monitoring terminal is tested, and flicker detection signal sets consistent as described above, the bright energy PQS-883 electric energy quality monitoring terminals reality in Nanjing
It is as shown in table 4 below to test result：
Table 4
| Time | A phase Short Term Flicker values | B phase Short Term Flicker values | C phase Short Term Flicker values |
| 2013.12.3115:14:00 | 0.0000 | 0.0000 | 0.0000 |
| 2013.12.3115:15:00 | 0.2138 | 0.2211 | 0.1941 |
| 2013.12.3115:16:00 | 0.4327 | 0.4331 | 0.4322 |
| 2013.12.3115:17:00 | 0.4327 | 0.4331 | 0.4322 |
| 2013.12.3115:18:00 | 0.4327 | 0.4331 | 0.4322 |
| 2013.12.3115:19:00 | 0.4327 | 0.4331 | 0.4322 |
| 2013.12.3115:20:00 | 0.4327 | 0.4331 | 0.4322 |
| 2013.12.3115:21:00 | 0.4327 | 0.4331 | 0.4322 |
| 2013.12.3115:22:00 | 0.4327 | 0.4331 | 0.4322 |
| 2013.12.3115:2300 | 0.4327 | 0.4331 | 0.4322 |
| 2013.12.3115:24:00 | 0.4327 | 0.4331 | 0.4322 |
| 2013.12.3115:25:00 | 0.4327 | 0.4331 | 0.4322 |
| 2013.12.3115:26:00 | 0.4327 | 0.4331 | 0.4322 |
| 2013.12.3115:27:00 | 0.3565 | 0.2277 | 0.2265 |
| 2013.12.3115:28:00 | 0.0000 | 0.0000 | 0.0000 |
It should be noted that as shown in table 4, experimental result uses the collection minute data of monitoring terminal, 15:15 points
When, the Short Term Flicker value of A phases is 0.5138, and the time that terminal sampling is monitored mainly due to flicker detection signal is not whole point
Clock, in addition, in actual measurement, monitoring terminal first has to sample complete 10min flickering signal, connects lower inner can just provide
The statistical value of Short Term Flicker, therefore 15 points of 15 minutes detection signals have had progressed to the 11st minute, in ensuing 10min,
It is per minute to have Short Term Flicker value.From the point of view of experimental result, the Short Term Flicker value precision of A, B, C phase flickering signal has reached 2%,
Illustrate that the stable state flicker test precision of the bright energy PQS-883 devices in Nanjing meets the requirement of A level equipment, it is to meet to demonstrate the present apparatus
IEC61000-4-15 standards and this detection signal correctness.
By experiment, using matlab analogue simulations, and the detection of multiple power quality analyzers is used it for, as a result filled
Dividing proves the feasibility of technical solution of the present invention.
In summary, the invention provides a kind of flickering accuracy checking method of digital electric power quality monitoring terminal and
System, not only solve and detect shadow caused by the flickering precision of digital electric energy quality monitoring terminal one by one by hand in the prior art
The technical problem of the true reflection of electric network terminal detection data is rung, and digital electric power quality monitoring terminal can be screened out to be
It is no according to IEC standard, accuracy of detection and dynamic flicker detection ability, only need continually changing a undulate quantity and vibration frequency
Detection signal, it is possible to easily and quickly to digitize transforming plant energy quality end flicker test ability comment
Estimate.
Beneficial effect of the present invention is：
1. solve caused by detecting the flickering precision of digital electric energy quality monitoring terminal one by one by hand in the prior art
The technical problem of the true reflection of electric network terminal detection data is influenceed, the digitlization for proposing step by step to be successively decreased based on flickering undulate quantity is become
The flickering accuracy checking method of power station energy quality monitoring terminal.
2. the creative flicker detection signal for devising undulate quantity and successively decreasing step by step：Preceding 3.5% period fluctuates size
0.25%, 8.8HZ sine modulation ripple；Following 7.5% period undulate quantity is8.8HZ sine modulation ripples；Connect
The 60% period undulate quantity got off is changed intoSine modulation ripple is changed into 8.0HZ；Last 29% period fluctuation
Measure and beThe frequency retrieval of sine modulation ripple is 8.8HZ.Totally four periods, 10 minutes.Believe within following 10 minutes
Four periods above number are repeated, signal length has altogether 20 minutes.
3. whether the detection signal that technical scheme proposes can screen out monitoring terminal according to IEC standard, inspection
Survey precision and dynamic flicker detection ability.Only need the detection signal of continually changing a undulate quantity and vibration frequency, so that it may
Easily and quickly to assess the flicker test ability for digitizing transforming plant energy quality end.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, Ke Yitong
Computer program is crossed to instruct the hardware of correlation to complete, described program can be stored in general computer read/write memory medium
In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
Those skilled in the art will also be appreciated that the various functions that the embodiment of the present invention is listed are by hardware or soft
Part depends on the design requirement of specific application and whole system to realize.Those skilled in the art can be for every kind of specific
Using, can be using the described function of various methods realization, but this realization is understood not to beyond guarantor of the embodiment of the present invention
The scope of shield.
Apply specific embodiment in the present invention to be set forth the principle and embodiment of the present invention, above example
Explanation be only intended to help understand the present invention method and its core concept；Meanwhile for those of ordinary skill in the art,
According to the thought of the present invention, there will be changes in specific embodiments and applications, in summary, in this specification
Appearance should not be construed as limiting the invention.
Claims (8)
1. a kind of flickering accuracy checking method of digital electric power quality monitoring terminal, it is characterized in that, described method is specifically wrapped
Include：
Sent to digital electric power quality monitoring terminal and meet International Electrotechnical Commission's IEC 61850-9-2 required standards letter
Number；
Described digital electric power quality monitoring terminal samples to described standard signal, and exports industrial manufacturing standard report
Literary MMS messages；
The minute data of Short Term Flicker index is determined according to described MMS messages；
The Short Term Flicker of the digital electric power quality monitoring terminal is determined according to the minute data of described Short Term Flicker index
Measured value；
Described standard signal is：The fluctuation size of preceding 3.5% period is 0.25%, 8.8Hz sine modulation ripple；Next
The undulate quantity of 7.5% period is8.8Hz sine modulation ripple；The undulate quantity of ensuing 60% period
ForSine modulation ripple is 9.5Hz；The undulate quantity of last 29% period isThe frequency of sine modulation ripple
Rate is 8.8Hz, totally four periods, 10 minutes, ensuing four periods repeated above for 10 minutes, standard signal
Length is 20 minutes.
2. according to the method for claim 1, it is characterized in that, dividing for Short Term Flicker index is determined according to described MMS messages
Clock data specifically include：
The described MMS messages of parsing；
The minute data of Short Term Flicker index is extracted in MMS messages after analytically.
3. according to the method for claim 2, it is characterized in that, institute is determined according to the minute data of described Short Term Flicker index
The Short Term Flicker measured value for stating digital electric power quality monitoring terminal specifically includes：
First value being not zero in Short Term Flicker measured value is extracted from the minute data table of described Short Term Flicker index；
At the time of determining that first value being not zero corresponds to, referred to as the first moment；
The first described moment was obtained into for the second moment plus 10 minutes；
Determine Short Term Flicker measured value corresponding to second moment.
4. the method according to claim 1 or 3, it is characterized in that, determining the digital electric power quality monitoring terminal
Short Term Flicker measured value after, described method also includes：
Obtain the Short Term Flicker theoretical value of the standard signal；
Described Short Term Flicker theoretical value is compared with described Short Term Flicker measured value, obtains comparison result；
Judge whether described digital electric power quality monitoring terminal meets IEC standard according to described comparison result.
5. a kind of flickering precision detection system of digital electric power quality monitoring terminal, it is characterized in that, described system is specifically wrapped
Include：
Standard signal dispensing device, meet International Electrotechnical Commission for being sent to digital electric power quality monitoring terminal
IEC61850-9-2 required standard signals；
Described digital electric power quality monitoring terminal, for being sampled to described standard signal, and export industrial manufacture
Specification message MMS messages；
Minute data determining device, for determining the minute data of Short Term Flicker index according to described MMS messages；
Short Term Flicker measured value determining device, it is described digital for being determined according to the minute data of described Short Term Flicker index
The Short Term Flicker measured value of electric energy quality monitoring terminal；
Described standard signal is：The fluctuation size of preceding 3.5% period is 0.25%, 8.8Hz sine modulation ripple；Next
The undulate quantity of 7.5% period is8.8Hz sine modulation ripple；The undulate quantity of ensuing 60% period
ForSine modulation ripple is 9.5Hz；The undulate quantity of last 29% period isThe frequency of sine modulation ripple
Rate is 8.8Hz, totally four periods, 10 minutes, ensuing four periods repeated above for 10 minutes, standard signal
Length is 20 minutes.
6. system according to claim 5, it is characterized in that, described minute data determining device specifically includes：
Parsing module, for parsing described MMS messages；
Minute data extraction module, for extracting the minute data of Short Term Flicker index in the MMS messages after analytically.
7. system according to claim 6, it is characterized in that, described Short Term Flicker measured value determining device specifically includes：
Extraction module, for being extracted from the minute data table of described Short Term Flicker index first in Short Term Flicker measured value
The individual value being not zero；
First moment determining module, at the time of for determining that first value being not zero corresponds to, referred to as the first moment；
Second moment determining module, for plus 10 minutes to be obtained into the second moment the first described moment；
Short Term Flicker measured value determining module, for determining Short Term Flicker measured value corresponding to second moment.
8. the system according to claim 5 or 7, it is characterized in that, described system also includes：
Short Term Flicker theoretical value acquisition device, for obtaining the Short Term Flicker theoretical value of the standard signal；
Comparison device, for described Short Term Flicker theoretical value to be compared with described Short Term Flicker measured value, compared
To result；
Judgment means, for judging whether described digital electric power quality monitoring terminal meets according to described comparison result
IEC standard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410169142.0A CN105022012B (en) | 2014-04-24 | 2014-04-24 | The flickering accuracy checking method and system of digital electric power quality monitoring terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410169142.0A CN105022012B (en) | 2014-04-24 | 2014-04-24 | The flickering accuracy checking method and system of digital electric power quality monitoring terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105022012A CN105022012A (en) | 2015-11-04 |
| CN105022012B true CN105022012B (en) | 2018-03-06 |
Family
ID=54412119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410169142.0A Active CN105022012B (en) | 2014-04-24 | 2014-04-24 | The flickering accuracy checking method and system of digital electric power quality monitoring terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105022012B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104698417B (en) * | 2015-03-16 | 2017-12-19 | 国网山西省电力公司电力科学研究院 | A kind of analog input formula flicker tester discriminating method |
| CN105277910B (en) * | 2015-11-24 | 2018-06-26 | 广东电网有限责任公司江门供电局 | The method and system of remote evaluation electric energy quality on-line monitoring device reliability |
| CN107390014B (en) * | 2017-08-22 | 2020-03-10 | 安徽大学 | Method for measuring fluctuating load flicker emission level |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5485393A (en) * | 1990-08-30 | 1996-01-16 | Metricom, Inc. | Method and apparatus for measuring electrical parameters using a differentiating current sensor and a digital integrator |
| CN202018504U (en) * | 2011-01-25 | 2011-10-26 | 华北电力科学研究院有限责任公司 | Electric energy quality analyzer detection system |
| CN103116095A (en) * | 2013-01-24 | 2013-05-22 | 广东电网公司电力科学研究院 | Full-automatic detecting system for power quality monitoring devices |
| CN103616654A (en) * | 2013-12-06 | 2014-03-05 | 国家电网公司 | System and method for testing power quality monitoring device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020045993A1 (en) * | 2000-09-25 | 2002-04-18 | Shincovich John T. | Point of use digital electric energy apparatus with wireless communication port |
-
2014
- 2014-04-24 CN CN201410169142.0A patent/CN105022012B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5485393A (en) * | 1990-08-30 | 1996-01-16 | Metricom, Inc. | Method and apparatus for measuring electrical parameters using a differentiating current sensor and a digital integrator |
| CN202018504U (en) * | 2011-01-25 | 2011-10-26 | 华北电力科学研究院有限责任公司 | Electric energy quality analyzer detection system |
| CN103116095A (en) * | 2013-01-24 | 2013-05-22 | 广东电网公司电力科学研究院 | Full-automatic detecting system for power quality monitoring devices |
| CN103616654A (en) * | 2013-12-06 | 2014-03-05 | 国家电网公司 | System and method for testing power quality monitoring device |
Non-Patent Citations (2)
| Title |
|---|
| 电能质量在线监测系统的研究;王海东;《华北电力大学学报》;20040730;第31卷(第4期);第31页左栏第5段 * |
| 高采样率数字化变电站电能质量监测系统研究与应用;王玲;<电力系统保护与控制>;20140216;第42卷(第4期);第112页左栏第3段至右栏第1段、第113页左栏第3段至右栏第4段 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105022012A (en) | 2015-11-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020258835A1 (en) | Detection method and system for pplp insulation aging degree of superconducting cable | |
| CN109270482B (en) | Online evaluation method for metering accuracy of voltage transformer and terminal equipment | |
| CN1200177A (en) | Method of locating a single-phase ground fault in a power distribution network | |
| CN103823165A (en) | Insulator pollution flashover pre-warning method and system based on leakage currents | |
| CN105098763A (en) | Transient voltage stable on-line assessment method based on WAMS and EMS | |
| CN106324321A (en) | Monitoring method and monitoring device for resistive current of zinc oxide lightning arrester | |
| WO2015061227A1 (en) | Performance analysis of power grid monitors | |
| CN103439631A (en) | Method and system for detecting corrosion state of grounding grid | |
| CN105022012B (en) | The flickering accuracy checking method and system of digital electric power quality monitoring terminal | |
| CN112731242A (en) | Calibration method of on-site calibrator of online power quality monitoring device | |
| CN103257273A (en) | Method for measuring phase difference of signals with same frequency period | |
| CN103884943A (en) | Method for comprehensively analyzing and diagnosing deformation of winding of transformer | |
| CN107741577A (en) | A kind of Source of Gateway Meter degree of accuracy on-line monitoring and analysis method and system | |
| CN104062618A (en) | Verification method for on-line monitoring device of double-signal-source capacitive equipment | |
| CN105068035B (en) | A kind of voltage transformer error horizontal dynamic detection method and system | |
| CN105093166B (en) | A kind of field test method of electronic electric energy meter | |
| CN105891625A (en) | Power system subsynchronous oscillation disturbance source identification method based on energy flow | |
| CN103344937B (en) | Intelligent electric energy meter consumption detection equipment and detection method | |
| CN101957436B (en) | Power supply quality tester of IT (Information Technology) server equipment and test method | |
| CN113466607A (en) | Three-phase cable intermediate joint moisture state analysis method | |
| Abidullah et al. | Real-time power quality disturbances detection and classification system | |
| CN110645887A (en) | Winding deformation judgment method based on short-circuit reactance | |
| CN105021909A (en) | Automatic detection method for digital electric energy quality monitoring terminal and system thereof | |
| CN110888100A (en) | Single-phase intelligent electric energy meter online on-load detection system and method | |
| CN109001104A (en) | A kind of local environment erosion analysis method based on high-throughput device electricity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |