CN110095680A - A kind of low-voltage short-circuiting failure quickly detects and peak value of short prediction technique - Google Patents
A kind of low-voltage short-circuiting failure quickly detects and peak value of short prediction technique Download PDFInfo
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- CN110095680A CN110095680A CN201910409030.0A CN201910409030A CN110095680A CN 110095680 A CN110095680 A CN 110095680A CN 201910409030 A CN201910409030 A CN 201910409030A CN 110095680 A CN110095680 A CN 110095680A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The present invention relates to a kind of low-voltage short-circuiting failures quickly to detect and peak value of short prediction technique.The A/D sampling of sample frequency is fixed to voltage, current signal and software algorithm filtering is carried out to gained signal；Then, short trouble is carried out to filtered current signal quickly to detect；If detecting short trouble, enter peak value of short Prediction program, short-circuit current forecast is carried out by trend extropolation predicted method, final result is compared with the connecting-disconnecting function of place line switching equipment, judges whether switchgear executes separating brake movement.Subsequent cycle is directly entered if not detecting short trouble.The present invention realizes the quick detection of short trouble after short trouble generation in 0.3ms, and the peak value prediction of short circuit current is realized in 0.1ms after detecting short trouble, through the invention, it can be when cutting off short trouble, reliable separating brake foundation is provided for switchgear, avoids the accident because caused by short circuit current is more than switchgear connecting-disconnecting function.
Description
Technical field
The invention belongs to electrical circuit fault detection with limitation field, more particularly to short trouble it is quick detect with it is short
A kind of low-voltage short-circuiting failure of road current peak prediction quickly detects and peak value of short prediction technique.
Background technique
With China's production capacity and improvement of living standard, demand of the society to electric power is increased rapidly, large sized unit
Constantly put into operation, and as closest to load, distribution system largest, route is longest, structure is increasingly sophisticated, is
System capacity also constantly increases.At this point, short circuit is as one of most common fault type in distribution system, capacity of short circuit and short circuit
Current peak level is also significantly promoted, and more stringent requirements are proposed for switching devices, however improves switchgear unlimitedly
Connecting-disconnecting function be it is very uneconomical, even not possible with.So if can short trouble generation after very short time in,
Short trouble is rapidly detected, the development trend of short circuit current will be effectively limited, is increased to realize in capacity of short circuit
In the case where adding, without increasing substantially the connecting-disconnecting function of switchgear, it is just able to achieve the excision of short trouble, will be provided with good
Economic value.
In recent years, on short trouble Fast Identification, domestic and foreign scholars successively propose different methods.It is applied to earliest
The detection of low-voltage distribution system short trouble is current instantaneous value or real available value method, but by line impedance, short-circuit initial shape
The influence of state, short circuit current must can be only achieved for a period of time preset threshold, cause the detection time of this method longer.Electric current becomes
Rate method theoretically overcomes current instantaneous value method and detects slow-footed disadvantage, but this structure is complicated, line in distribution system
The occasion that road is long, load is numerous, it is difficult to which the interference for rejecting route and noise of equipment causes the reliability of this method to be unable to get guarantor
Card.Based on wavelet packet details decompose short circuit failure detection method, solve wavelet transformation to individual failure first phase angle range without
The problem of method effectively identifies, while also improving the repellence to noise.But it is negative in face of complicated working condition, such as difference
Load starting and short trouble state current signal, due to its similarity height, mistake may be had by only relying on single electric current criterion
Sentence situation, if voltage criterion can be added, reliability be will further improve.
After short trouble occurs, separating brake instruction is received to separating brake movement has been executed, according to switchgear from switchgear
Difference, this period may be from more than ten milliseconds to milliseconds up to a hundred.Opening velocity is faster, and the time is shorter, but switchgear cost
It is higher.By this period, short circuit current has evolved to the level close to peak value, it is also possible to it experienced several peak values, if this
When short circuit current be more than switchgear limit connecting-disconnecting function, switchgear continues to execute separating brake instruction, and that arcing will occur is existing
As more serious situation is to cause the spring repeatedly of switchgear, so that burning out equipment, economic loss and personnel is caused to be hurt
It dies.Therefore, judge switchgear whether separating brake when, more early can know peak value of short, it will be able to goodly to equipment into
Row control is beneficial to extend service life of equipment.
The present invention is carried out by a certain level phase voltage, line voltage and phase current to low-voltage distribution system, line current
Comprehensive analysis, realization quickly and reliably detects short trouble, when judgement truly has short trouble to occur, into short circuit current
Peak value Prediction program carries out peak value of short prediction by trend extropolation predicted method, by result and place line switching equipment
Connecting-disconnecting function be compared, judge its whether execute separating brake movement.The present invention overcomes the judgement times of conventional short-circuit criterion
It is too long, and fault type judgement can be carried out to having recognized to be out of order.Meanwhile this method is affected by noise small, high reliablity, to open
Close whether equipment executes sub-switching operation offer fact basis.
Summary of the invention
It is an object of the invention to the slow, poor reliability for distribution system short-circuit detecting speed, without separating brake foundation the shortcomings that,
There is provided a kind of low-voltage short-circuiting failure quickly detect with peak value of short prediction technique, can be effectively and reliably by this method
It realizes the quick detection of short trouble and the prediction of peak value of short, significantly improves the quick-action, reliable of short-circuit protection
Property, system protection performance is improved, improves separating brake foundation for protective switch equipment, protection equipment is played, extends service life of equipment
Effect.
To achieve the above object, the technical scheme is that a kind of low-voltage short-circuiting failure quickly detects and short circuit current
Peak value prediction technique, includes the following steps,
Step S1, the A/D that wherein sample frequency is fixed in a level phase voltage and line current of distribution system is adopted
Sample simultaneously carries out software filtering algorithm filtering；
Step S2, voltage, current signal are analyzed simultaneously using Wavelet Packet Algorithm: is decomposed by Wavelet Packet Algorithm
To voltage, the dd5 component of electric current, when the dd5 component of voltage, electric current is more than set threshold value, judge that short-circuit event occurs
Barrier, and issue failure signal；If not issuing fault-signal, cycle detection；
Step S3, when issuing fault-signal, into peak value of short Prediction program, by trend extropolation predicted method to short
Road electric current is predicted, the peak value of short of prediction and set switchgear breaking capacity is compared, if opening
It closes within the scope of equipment breaking capacity, then issues sub-gate signal, if being more than switchgear breaking capacity, issue block signal, by
The bigger switchgear of upper level connecting-disconnecting function carries out separating brake；
Step S4, after the completion of the execution of peak value of short Prediction program, short trouble type determining program is executed, is executed
Complete short trouble type determining program continues return step S2 progress short trouble and quickly detects.
In an embodiment of the present invention, in step S1, software filtering algorithm includes mean filter, wavelet filtering and mathematics
Morphologic filtering algorithm.
In an embodiment of the present invention, in step S2, Wavelet Packet Algorithm is wavelet packet details decomposition algorithm.
In an embodiment of the present invention, in step S3, short circuit current is predicted by trend extropolation predicted method tool
Body implementation are as follows: establish short circuit current mathematical model at any time, utilize history or the feature of real time data solving model ginseng
Number, recursion is predicted in time series.
In an embodiment of the present invention, in step S4, short trouble type determining program realizes the judgement of short trouble type
Concrete mode are as follows: if it is detected that only a phase breaks down, for single-phase short circuit；If it is detected that two-phase breaks down, it is two
Mutually short circuit, and then judge whether this two phase line current is reversed, if being two-phase phase fault reversely, if not reversed, for two-phase
Ground short circuit；If it is detected that three-phase breaks down, for three-phase shortcircuit.
In an embodiment of the present invention, this method is suitable for all kinds of short troubles, including three-phase shortcircuit, line to line fault or list
Phase short trouble, this method are also adapted to all kinds of Grounding Types failures.
In an embodiment of the present invention, this method applies also for middle pressure, high pressure even extra-high voltage Force system.
In an embodiment of the present invention, this method is applied in low-voltage distribution system, retains conventional in low-voltage distribution system
Error protection adjusting；When low-voltage distribution system operates normally, short trouble protection act is by the method and conventional event
Barrier protection is controlled together.
Compared to the prior art, the invention has the following advantages: the present invention is first to route phase voltage and line current
It carries out A/D sampling to filter with software algorithm, recycles voltage, current signal singularity characteristics to carry out short trouble and quickly detect,
Detect that failure continues peak value of short prediction, by the connecting-disconnecting function of the peak value of short predicted and switchgear
It is compared, judges to issue sub-gate signal or block signal, provide movement foundation for switchgear.The present invention realizes failure
The quick detection of short trouble is realized after generation in 0.3ms, and realizes short circuit current in 0.1ms after detecting short trouble
Peak value prediction, greatly improves detection speed, and can be effectively protected switchgear and power load, extends it and uses the longevity
Life, has higher economic value.
Detailed description of the invention
Fig. 1 is that Fig. 1 of the present invention is the method for the present invention flow chart.
Fig. 2 is typical multi-layer low-voltage distribution system analogous diagram.
Fig. 3 is short-circuit equivalent circuit diagram.
Fig. 4 is A phase short-circuit voltage, electric current and corresponding dd5 component map.
Fig. 5 is that short trouble quickly detects and short-circuit current forecast timing diagram.
Fig. 6 is the short circuit current waveform fitted figure of α=10 °.
Fig. 7 is the short circuit current waveform fitted figure of α=160 °.
Fig. 8 is fault detection and the short-circuit current forecast process overall situation figure of α=160 °.
Fig. 9 is fault detection and the short-circuit current forecast Product management model figure of α=160 °.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is specifically described.
As shown in Figure 1, the present invention provides a kind of low-voltage short-circuiting failure quickly detect with peak value of short prediction technique,
Include the following steps,
Step S1, the A/D that wherein sample frequency is fixed in a level phase voltage and line current of distribution system is adopted
Sample simultaneously carries out software filtering algorithm filtering；
Step S2, voltage, current signal are analyzed simultaneously using Wavelet Packet Algorithm: is decomposed by Wavelet Packet Algorithm
To voltage, the dd5 component of electric current, when the dd5 component of voltage, electric current is more than set threshold value, judge that short-circuit event occurs
Barrier, and issue failure signal；If not issuing fault-signal, cycle detection；
Step S3, when issuing fault-signal, into peak value of short Prediction program, by trend extropolation predicted method to short
Road electric current is predicted, the peak value of short of prediction and set switchgear breaking capacity is compared, if opening
It closes within the scope of equipment breaking capacity, then issues sub-gate signal, if being more than switchgear breaking capacity, issue block signal, by
The bigger switchgear of upper level connecting-disconnecting function carries out separating brake；
Step S4, after the completion of the execution of peak value of short Prediction program, short trouble type determining program is executed, is executed
Complete short trouble type determining program continues return step S2 progress short trouble and quickly detects.
In step S1, software filtering algorithm includes mean filter, wavelet filtering and mathematical morphology filter algorithm.
In step S2, Wavelet Packet Algorithm is wavelet packet details decomposition algorithm, is implemented as follows:
Wavelet packet details decomposition algorithm, recurrence formula are as follows:
In formula: j be decomposition scale and j > 0,Smooth component and details respectively under jth scale
Component, hk、gkThe respectively coefficient of low pass and high-pass filter, h-1=1/8, h0=3/8, h1=3/8, h2=1/8, g-1=0,
g0=-2, g1=2, g2=0.And use component(i.e. dd5) is used as short trouble decision content.
In step S3, short circuit current is predicted by trend extropolation predicted method specific implementation are as follows: establishment is short
Electric current mathematical model at any time in road utilizes the characteristic parameter of history or real time data solving model, the recursion in time series
Prediction, is implemented as follows:
The first step it is as shown in Figure 3 to establish short-circuit equivalent model, in which: R1、L1For source side equivalent resistance and inductance, R2、
L2For equivalent load resistance and inductance, u (t) is equivalent source, it is assumed that short circuit occurs for the t=0 moment, and moment electricity occurs according to failure
The principle that inducing current cannot be mutated can obtain shown in short circuit current transient expression formula such as formula (3).Wherein,For current cycle component peak value after short circuit,Before short circuit
Current peak, α are false voltage initial phase angle,For short-circuit loop impedance angle,For
Short-circuit front loop impedance angle,For damping time constant.
Enable Ir=ImCos (α-φ), Ic=ImSin (α-φ), Id=Im0sin(α-φ0)-ImSin (α-φ), can be by formula
(3) formula (4) are reduced to:
Second step solves characteristic parameter.For formula (4), if sampling rate is each primitive period to sample NpIt is secondary, the period
The frequency of component is fr, then the discrete expression of short circuit current mathematical model is formula (4).In formula, IrFor in periodic component just
String component, IcFor the cosine component in periodic component, IdFor attenuating dc component initial value, E is DC component decay factor.It is examining
After measuring short trouble, as long as extracting this 4 characteristic parameters using the short-circuit current data of early stage, short-circuit electricity can be uniquely determined
Discrete expression is flowed, has also determined that the development trend of short circuit current.
Wherein DC component decay factor E solution procedure are as follows: for any 3 samplings on same short circuit current curve
Data I (p), I (q), I (r), wherein r > q > p > 0, can establish one about λ1、λ2、λ3The underdetermined system of equations such as formula (6)
It is shown:
Any one group of solution [λ of the underdetermined system of equations1 λ2 λ3] (the basic filtering matrix of ternary) substitution formula (6), it can all acquire short
The decay factor E of the attenuating dc component of road electric current,
For any m sampled data, initial data is utilized in order to sufficiently effective, in the base of the basic filtering matrix of ternary
It is expanded on plinth, is handled by weighted sum, can get polynary filtering matrix η=[η1 η2 … ηm-1], so that formula (7)
It sets up, acquires decay factor E.
In turn, the attenuating dc component initial value Id of short circuit current is acquired according to formula (9).
Then, according to the attenuating dc component initial value Id and its decay factor E acquired, direct current is deducted from original signal
Component Id (k) can acquire periodic component of short-circuit current Is (k).
Finally, solving the sinusoidal component in periodic component, cosine component characteristic parameter.
ST=[Is(1) Is(2)…Is(m)] (12)
Q+=(QTQ)-1QT (13)
Then QR=S is one group about Ir, IcOver-determined systems.Wherein, QTFor the transposition of Q, STFor the transposition of S, Q+For square
The left pseudo inverse matrix of battle array Q.According to least square principle, short circuit current exchange point is solved using the geometric meaning of left pseudo inverse matrix
Sinusoidal component and cosine component characteristic parameter in amount is as follows:
Third step, the characteristic parameter according to required by second step are brought into the Short-way model of the first step, can be realized when
Between recursion prediction in sequence.
Need specified otherwise, entire prediction process pertains only to the basic arithmetic such as addition subtraction multiplication and division, and triangle letter
Numerical value can table look-up acquisition, therefore this method is easy to realize on hardware；Without knowing false voltage initial phase angle and failure when prediction
Detection time is provided convenience for the on-line prediction of short circuit current.
In step S4, short trouble type determining program realizes the concrete mode of short trouble type judgement are as follows: if detection
Only a phase breaks down out, then is single-phase short circuit；If it is detected that two-phase breaks down, for line to line fault, and then judge this two
Whether phase line current is reversed, if being two-phase phase fault reversely, if not reversed, for two-phase grounding fault；If it is detected that three
It mutually breaks down, is then three-phase shortcircuit.
This method is suitable for all kinds of short troubles, including three-phase shortcircuit, line to line fault or single-phase earthing fault, and this method is also
It is suitable for all kinds of Grounding Types failures.
This method applies also for middle pressure, high pressure even extra-high voltage Force system.
This method is applied in low-voltage distribution system, retains error protection adjusting conventional in low-voltage distribution system；Low
When being press-fitted electric system normal operation, short trouble protection act is controlled together by the method and conventional error protection.
The following are specific implementation examples of the invention.
Typical low-voltage distribution system is as shown in Fig. 2, this is the simulation model of a three level low-voltage distribution systems, the
Three levels connect motor load, and power supply 0.4kV connects type, neutral ground using Y.Since single-phase earthing fault occurs generally
Rate is maximum, and A phase ground fault is arranged by the malfunctioning module in short dot (the second level end) in present embodiment, in the second layer
Grade carries out single-phase earthing fault emulation, is examined in voltage, current acquisition point (the second level first section) collection voltages, the magnitude of current
It surveys.
Voltage, electric current and corresponding dd5 component when Fig. 4 is the short circuit of A phase, it can be seen that in 0.3s, dd5 component can be with
Apparent characterization short trouble.Fig. 6, Fig. 7 are the short circuit current progress trend that false voltage initial phase angle is respectively 10 ° and 160 °
For the waveform fitting of outside forecast emulation as a result, blue solid lines are original short circuit current waveform, red dotted line is by trend extropolation
The fitting waveform of prediction, green solid lines are the attenuating dc component isolated from original short circuit current.No matter decaying dc divides
It is big or small to measure initial value, original short circuit current waveform and fitting uniformity in waveform are good.
The present invention, which also passes through DSP, realizes real-time online detection, after tested it is found that under most of false voltage initial phase angle
The failure detection time that DSP is realized, the detection time for changing unobvious phase angle will be longer in 300us or so.For this purpose, detecting
To after failure, re-sampling 350us amounts to 600us's using the data of 250us before fault detection and the data of 350us later
Data calculate the characteristic parameter of short circuit current, and then recursion prediction short circuit current is until the second peak value.Failure early detection with
Short-circuit current forecast timing is as shown in figure 5, tdFor failure detection time, tsFor re-sampling time, tcFor recursion prediction calculating when
Between.According to timing shown in fig. 5, short trouble early detection has been write in the translation and compiling environment of DSP and short circuit current is online
The program of prediction.With 10 ° for interval, the short-circuit current forecast result under 0 ° to 350 ° of false voltage initial phase angle is tested.Its
In, the fault detection and short-circuit current forecast process under 20 ° of phase angles are as shown in Figure 8.Channel 1 is current waveform, and channel 2 is DSP
Pin level waveform.As it can be observed in the picture that the first, second peak value is all bigger under 20 ° of phase angles, and fault detection and short circuit electricity
Stream prediction process is completed soon.As it can be seen in figure 9 that DSP detects short trouble after 306us occurs for failure, then adopt
After sample 350us, starts the prediction of short circuit current trend extropolation, complete entire recurrence calculation process time-consuming 88us.Through checking
For variable in CCStudio it is found that the first peak error is -0.0755%, the second peak error is 0.0718%, predicts error
Both less than 5%, within engineering allowable error.
All kinds of short troubles of the method for the invention suitable for low-pressure system, comprising: three-phase shortcircuit, line to line fault,
Single-phase earthing fault.
The present invention is not limited to the above specific embodiment, as long as using the short trouble of the invention quickly side of detection
Software processing flow involved in method and short-circuit current forecast method and using voltage, electric current is comprehensive or single judgement and using becoming
Gesture extrapolation realizes peak value of short prediction, no matter is applied to any voltage class, which kind of short trouble or low pressure system
System Grounding Types, both fall within protection scope of the present invention.
Claims (8)
1. a kind of low-voltage short-circuiting failure quickly detects and peak value of short prediction technique, which is characterized in that include the following steps,
Step S1, the A/D sampling of sample frequency is fixed simultaneously to wherein a level phase voltage and the line current of distribution system
Carry out the filtering of software filtering algorithm；
Step S2, voltage, current signal are analyzed simultaneously using Wavelet Packet Algorithm: decomposes to obtain electricity by Wavelet Packet Algorithm
The dd5 component of pressure, electric current judges generation short trouble when the dd5 component of voltage, electric current is more than set threshold value, and
Issue fault-signal；If not issuing fault-signal, cycle detection；
Step S3, when issuing fault-signal, into peak value of short Prediction program, by trend extropolation predicted method to short-circuit electricity
Stream is predicted, the peak value of short of prediction and set switchgear breaking capacity are compared, if setting in switch
Within the scope of back-up cutting capacity, then sub-gate signal is issued, if being more than switchgear breaking capacity, issues block signal, You Shangyi
The bigger switchgear of grade connecting-disconnecting function carries out separating brake；
Step S4, after the completion of the execution of peak value of short Prediction program, short trouble type determining program is executed, has been executed short
Road fault type determining program continues return step S2 progress short trouble and quickly detects.
2. a kind of low-voltage short-circuiting failure according to claim 1 quickly detects and peak value of short prediction technique, spy
Sign is, in step S1, software filtering algorithm includes mean filter, wavelet filtering and mathematical morphology filter algorithm.
3. a kind of low-voltage short-circuiting failure according to claim 1 quickly detects and peak value of short prediction technique, spy
Sign is, in step S2, Wavelet Packet Algorithm is wavelet packet details decomposition algorithm.
4. a kind of low-voltage short-circuiting failure according to claim 1 quickly detects and peak value of short prediction technique, spy
Sign is, in step S3, short circuit current is predicted by trend extropolation predicted method specific implementation are as follows: establish short circuit
Electric current mathematical model at any time, using the characteristic parameter of history or real time data solving model, recursion is pre- in time series
It surveys.
5. a kind of low-voltage short-circuiting failure according to claim 1 quickly detects and peak value of short prediction technique, spy
Sign is, in step S4, short trouble type determining program realizes the concrete mode of short trouble type judgement are as follows: if it is detected that
Only a phase breaks down, then is single-phase short circuit；If it is detected that two-phase breaks down, for line to line fault, and then this two-phase is judged
Whether line current is reversed, if being two-phase phase fault reversely, if not reversed, for two-phase grounding fault；If it is detected that three-phase
It breaks down, is then three-phase shortcircuit.
6. a kind of low-voltage short-circuiting failure according to claim 1 quickly detects and peak value of short prediction technique, spy
Sign is that this method is suitable for all kinds of short troubles, including three-phase shortcircuit, line to line fault or single-phase earthing fault, and this method is also
It is suitable for all kinds of Grounding Types failures.
7. a kind of low-voltage short-circuiting failure according to claim 1 quickly detects and peak value of short prediction technique, spy
Sign is that this method applies also for middle pressure, high pressure even extra-high voltage Force system.
8. a kind of low-voltage short-circuiting failure according to claim 1 quickly detects and peak value of short prediction technique, spy
Sign is that this method is applied in low-voltage distribution system, retains error protection adjusting conventional in low-voltage distribution system；In low pressure
When distribution system operates normally, short trouble protection act is controlled together by the method and conventional error protection.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112034387A (en) * | 2020-09-08 | 2020-12-04 | 武汉大学 | Power transmission line short-circuit fault diagnosis method and device based on prediction sequence |
| CN112748361A (en) * | 2020-04-28 | 2021-05-04 | 天津市中力神盾电子科技有限公司 | Distribution line short-circuit current detection method and device |
| CN113253048A (en) * | 2021-04-27 | 2021-08-13 | 南京南瑞继保电气有限公司 | Short-circuit fault detection method and device |
| CN114566936A (en) * | 2022-02-14 | 2022-05-31 | 福建华电电力工程有限公司 | Thermal power plant low-voltage alternating current system relay protection tripping triggering method and device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278711A (en) * | 2013-04-28 | 2013-09-04 | 福州大学 | Method for early detecting and identifying short-circuit faults and series arc faults |
| CN105021869A (en) * | 2015-07-22 | 2015-11-04 | 厦门理工学院 | Low-voltage power distribution short-circuit current peak prediction method |
-
2019
- 2019-05-16 CN CN201910409030.0A patent/CN110095680A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278711A (en) * | 2013-04-28 | 2013-09-04 | 福州大学 | Method for early detecting and identifying short-circuit faults and series arc faults |
| CN105021869A (en) * | 2015-07-22 | 2015-11-04 | 厦门理工学院 | Low-voltage power distribution short-circuit current peak prediction method |
Non-Patent Citations (3)
| Title |
|---|
| 吴晓梅 等: "低压***多层级短路故障早期检测辨识研究", 《电工电能新技术》 * |
| 巫锡华: "短路电流预测的低压多层级选择性保护及分断技术", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 缪希仁 等: "低压***多层级短路电流早期检测与预测", 《电工技术学报》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748361A (en) * | 2020-04-28 | 2021-05-04 | 天津市中力神盾电子科技有限公司 | Distribution line short-circuit current detection method and device |
| CN112034387A (en) * | 2020-09-08 | 2020-12-04 | 武汉大学 | Power transmission line short-circuit fault diagnosis method and device based on prediction sequence |
| CN112034387B (en) * | 2020-09-08 | 2021-09-21 | 武汉大学 | Power transmission line short-circuit fault diagnosis method and device based on prediction sequence |
| CN113253048A (en) * | 2021-04-27 | 2021-08-13 | 南京南瑞继保电气有限公司 | Short-circuit fault detection method and device |
| CN113253048B (en) * | 2021-04-27 | 2022-10-28 | 南京南瑞继保电气有限公司 | Short-circuit fault detection method and device |
| CN114566936A (en) * | 2022-02-14 | 2022-05-31 | 福建华电电力工程有限公司 | Thermal power plant low-voltage alternating current system relay protection tripping triggering method and device |
| CN114566936B (en) * | 2022-02-14 | 2023-10-31 | 福建华电电力工程有限公司 | Relay protection tripping triggering method and device for low-voltage alternating-current system of thermal power plant |
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Application publication date: 20190806 |