CN106066444A - Ground fault detection device and method based on capacitance partial pressure and big data analysis - Google Patents
Ground fault detection device and method based on capacitance partial pressure and big data analysis Download PDFInfo
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- CN106066444A CN106066444A CN201610417293.2A CN201610417293A CN106066444A CN 106066444 A CN106066444 A CN 106066444A CN 201610417293 A CN201610417293 A CN 201610417293A CN 106066444 A CN106066444 A CN 106066444A
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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
Abstract
The invention discloses a kind of ground fault detection device and method based on capacitance partial pressure and big data analysis, including sample processing unit and sampling unit, sampling unit includes the voltage sample module for gathering distribution line voltage-to-ground.The distribution line ground fault detection device of the present invention and monitoring method can be sampled the voltage-to-ground of supply line by using the voltage acquisition module with capacitance partial pressure, after tested distribution line generation earth fault, metastable sampled voltage can be obtained by the capacitance partial pressure acquisition module that capacitance resistance is constituted, this fault monitoring device and monitoring method relax the requirement to measurement instantaneity for the hardware, belong to steady state measurement technology after supply line's ground connection, line-to-ground fault can be identified quickly and accurately；Carrying out big data analysis by the data that break down supply line in history, each branch of supply line fault rate is asked in Dynamic Programming, in conjunction with actual track alarm condition, provides malfunction elimination path optimizing decision.
Description
Technical field
The present invention relates to feeder line fault monitoring technical field, especially a kind of 10KV overhead transmission line, cable roadbed
Single-phase or multiphase ground fault detection device and monitoring method in capacitance partial pressure and big data analysis.
Background technology
In electric power network distribution line system, 10KV system is medium voltage network, China's medium voltage network many employings neutral point
Non-effectively earthed system, when there is singlephase earth fault, neutral point voltage rises a height of faulted phase voltage, and A, B, C tri-is alternate
Line voltage be held essentially constant, fault current is little, therefore can run about 2 hours, thereby guarantees that power supply reliability.But,
Occur after singlephase earth fault, need timely line disconnection or fix a breakdown, otherwise, after electrical network runs a period of time in spite of illness by
Phase fault can be gradually evolved in shelf depreciation reason, bring bigger damage to supply line.
Owing to the neutral grounding mode of 10KV power distribution network is various, cause earth fault difficult judgment.In order to monitor and and
Shi Faxian earth fault, ground fault detection conventional at present has injecting signal, line mutual-ground capacitor electric discharge, zero-sequence current
Several main method such as determining method and three phase-to-ground voltage comparison methods.Wherein, injecting signal needs outer signal source, gives power supply
System brings additional faults hidden danger, and the frequency of Injection Signal selects also to have influence on the correctness of route selection；Line mutual-ground capacitor discharges
Method is affected very big by the external arc suppression coil of neutral point, and the accuracy of causing trouble route selection is relatively low；Zero-sequence current determining method is being maked somebody a mere figurehead
Circuit uses limited, use mathematical vector synthetic technology construction zero-sequence current also to be restricted by hardware device performance up till now；
Three phase-to-ground voltage comparison methods need to measure three phase-to-ground voltages, determine Earth Phase according to the sequence of magnitude of voltage size, but in reality
In distribution line, directly measurement voltage-to-ground has very big inconvenience.Existing 10KV distribution net work earthing fault monitoring technology can not
Meet the quick requirement identifying line single phase grounding failure.
Content of the invention
The invention provides a kind of ground fault detection device and method based on capacitance partial pressure and big data analysis, can
Identify the generation of line-to-ground fault quickly and accurately, overcome that in prior art, Earth Fault Detection speed is slow, accuracy rate is low
Defect.
In order to solve the problems referred to above, the present invention provides a kind of ground fault detection based on capacitance partial pressure and big data analysis
Device, including sample processing unit and sampling unit, it is characterised in that described sampling unit includes for gathering distribution line pair
The voltage sample module of ground voltage, described voltage sample module includes the input for being connected, described input with distribution line
End is connected with the first diode, the second resistance and the 3rd resistance in turn, described 3rd resistance eutral grounding, described input and described the
Being also associated with the first electric capacity between one diode, one end of described first electric capacity is connected with described input, described first electric capacity
Other end ground connection, the two ends of described first electric capacity are also connected in parallel to the first resistance, described second resistance and described 3rd electricity
Having the first exit being connected with described sample processing unit between resistance, described sample processing unit is at described first exit
Gather sampled voltage.
The ground fault detection device based on capacitance partial pressure and big data analysis that the present invention provides also has techniques below
Feature:
Further, described sampling unit also includes the current sample module for gathering distribution line current information, institute
State current sample module and include the first mutual inductor for gathering distribution line current information, the two of described first mutual inductor
End is connected in series with the 4th resistance being serially connected and the 5th resistance, and the two ends of described first mutual inductor are also connected in parallel to the
One Zener diode, described first mutual inductor one end ground connection, have between described 4th resistance and described 5th resistance with
The second exit that described sample processing unit is connected, described sample processing unit is at described second exit collection sampling electricity
Stream, is also associated with the 3rd electric capacity, described 3rd electric capacity one end and institute between described second exit and described sample processing unit
Stating the second exit to be connected, described 3rd electric capacity other end ground connection, it is steady that the two ends of described 3rd electric capacity are also connected in parallel to second
Pressure diode.
Further, the two ends of described 3rd resistance are also connected in parallel to the second electric capacity.
Further, described sample processing unit is also associated with the height sensor for gathering distribution line height and use
In the humidity sensor gathering ambient humidity near distribution line.
Further, described sample processing unit is also connected with communication module.
A kind of ground fault detection based on capacitance partial pressure and big data analysis of offer is provided
Method, the method comprises the following steps:
S10: use above-mentioned ground fault detection device to gather the sampled voltage of the uniline in distribution line；
S20: described sampled voltage and first predeterminated voltage of the uniline collecting are compared, if described sampling electricity
Pressure is less than the first predeterminated voltage, it is determined that this uniline is in power down mode；If described sampled voltage is more than or equal to first
Predeterminated voltage, the then size of more described sampled voltage and the second predeterminated voltage, described second predeterminated voltage is more than described first
Predeterminated voltage；
S30: described sampled voltage is more than or equal to the second predeterminated voltage, then more described sampled voltage and the 3rd presets electricity
The size of pressure, if described sampled voltage is more than the 3rd predeterminated voltage, then judges that this uniline is working properly, described 3rd pre-
If voltage is more than described second predeterminated voltage；If described sampled voltage is less than the second predeterminated voltage, then judge this uniline
There is earth fault.
The ground fault detection method based on capacitance partial pressure and big data analysis that the present invention provides also has techniques below
Feature:
Further, described step S10 also includes, the sample rate current of the uniline in collection distribution line；
Described step S20 is, if described sampled voltage is less than the first predeterminated voltage and described sample rate current is equal to zero, sentences
This uniline fixed is in power down mode；If described sampled voltage is more than or equal to the first predeterminated voltage and described sample rate current
It is not equal to zero, then the size of more described sampled voltage and the second predeterminated voltage；
Described step S30 is, described sampled voltage is more than or equal to the second predeterminated voltage and described sample rate current is not equal to
Zero, then the size of more described sampled voltage and the 3rd predeterminated voltage, if described sampled voltage is more than the 3rd predeterminated voltage, then
Judge that this uniline is working properly；If described sampled voltage is less than the second predeterminated voltage and described sample rate current is not equal to
Zero, then judge this uniline generation earth fault.
Further, described step S30 also includes: if described sampled voltage is more than the 3rd predeterminated voltage, single according to this
The height of phase line, the described sampled voltage of ambient humidity correction, after correction, described sampled voltage is more than the 3rd predeterminated voltage, then sentence
This uniline fixed is working properly.
Further, described step S30 also includes S31: if described sampled voltage is less than the second predeterminated voltage, and calculating should
The sampled voltage of uniline is single-phase with other two-phases with the difference of the sampled voltage of other two-phase unilines and described difference
The percent value of the sampled voltage of circuit, if described percent value is more than the first predetermined threshold value, then judges that this uniline is sent out
Raw earth fault.
Further, described step S30 also includes step S32: occur in history according to power supply branch road each in distribution network
The frequency of earth fault, the length of each power supply branch road and whole distribution network total line length ratio, utilize Bayesian formula meter
Calculate the probability from each power supply branch road Li for earth fault A of generation.
There is advantages that this based on capacitance partial pressure and big data analysis ground fault detection device and
Monitoring method can be sampled by voltage acquisition module the voltage-to-ground of supply line, and the change according to sampled voltage judges power supply
Whether circuit there is earth fault, by arranging the first electric capacity being grounded, after tested distribution line generation earth fault, passes through
The voltage acquisition module that capacitance resistance is constituted can obtain metastable sampled voltage, this fault monitoring device and monitoring method
Relax the requirement to measurement instantaneity for the hardware, belong to steady state measurement technology after supply line's ground connection, can know quickly and accurately
Other line-to-ground fault；Carrying out big data analysis by the data that break down supply line in history, Dynamic Programming is asked for supplying
Each branch's fault rate of electric line, in conjunction with actual track alarm condition, it is further provided malfunction elimination path optimum is determined
Plan.
Brief description
Fig. 1 is the structural representation of the ground fault detection device of the embodiment of the present invention；
Fig. 2 is the circuit diagram of the ground fault detection device of the embodiment of the present invention；
Fig. 3 is the flow chart of the ground fault detection method of the embodiment of the present invention；
Fig. 4 is the flow chart of the ground fault detection method of another embodiment of the present invention；
Fig. 5 is the flow chart of the ground fault detection method of another embodiment of the present invention.
Detailed description of the invention
Below with reference to accompanying drawing and describe the present invention in detail in conjunction with the embodiments.It should be noted that do not conflicting
In the case of, the embodiment in the present invention and the feature in embodiment can be mutually combined.
The one of the ground fault detection device based on capacitance partial pressure and big data analysis of the present invention as shown in Figure 1 and Figure 2
In individual embodiment, this distribution line ground fault detection device includes sample processing unit 10 and sampling unit 20, sampling processing
Unit 10 includes the CPU processing module of low-power consumption, and described sampling unit 20 includes the electricity for gathering distribution line voltage-to-ground
Pressure sampling module 21, voltage sample module 21 includes the input 211 for being connected with distribution line, and input 210 connects successively
It is connected to the first diode D1, the second resistance R2 and the 3rd resistance R3, the 3rd resistance eutral grounding R3, input 211 and the first diode
Being also associated with the first electric capacity C1 between D1, one end of the first electric capacity C1 is connected with input 211, another termination of the first electric capacity C1
Ground, the two ends of the first electric capacity C1 are also connected in parallel to the first resistance R1, have between the second resistance R2 and described 3rd resistance R3
The first exit being connected with sample processing unit 10, sample processing unit 10 gathers sampled voltage E at described first exit.
This distribution line ground fault detection device can be sampled by voltage acquisition module the voltage-to-ground of supply line, according to sampling
The change of voltage judges whether supply line occurs earth fault, by arranging the first electric capacity being grounded, when tested distribution line
After there is earth fault, metastable sampled voltage can be obtained by the voltage acquisition module that capacitance resistance is constituted, this event
Barrier monitoring device and monitoring method relax the requirement to measurement instantaneity for the hardware, belong to steady state measurement skill after supply line's ground connection
Art, can identify line-to-ground fault quickly and accurately.
Specifically, as in figure 2 it is shown, be somebody's turn to do the input of the ground fault detection device based on capacitance partial pressure and big data analysis
End 211 and the bare conductor of a certain single phase power supply circuit in 10KV distribution line are joined directly together, right by this single phase power supply circuit
Ground distribution capacity is denoted as C4, and due to height and the media variations over the ground of supply line, C4 is the electric capacity changing, and is ignoring electricity
When holding pole plate edge effect, its capacitance size is:
Wherein, ε0For permittivity of vacuum, εrFor the relative dielectric constant of medium, S is pole plate relative area, and d is two-plate
Spacing, i.e. supply line's height off the ground.The voltage-to-ground of 10KV supply line is denoted as V, and the value of voltage-to-ground V is according to 10KV
Supply line can be demarcated as 5774 volts to earth electric field form, in the case that R1 is very big, for example: R1 is 10M Ω, by the first electricity
The voltage holding C1 two ends is denoted as Vc1, according to condensance voltage divider principle,
When circuit normally work occur without singlephase earth fault when, C1 and C4 is electrically charged, and voltage Vc1 is through the first diode
After D1, by the second resistance R2 and the 3rd resistance R3 dividing potential drop, defeated by the first exit between the second resistance R2 and the 3rd resistance R3
Go out sampled voltage, in this embodiment, c1=0.01uf, R2=2M Ω, R3=10M Ω, the computing formula of sampled voltage E is:
E=R3*Vc1/ (R2+R3)；
When the 10KV supply line being connected with input 211 occurs earth fault, bare conductor is directly connected with the earth, should
The C4 of distribution capacity over the ground of single phase power supply circuit disappears, i.e. C4=0, and now, charge discharging resisting is directly fallen by the first electric capacity C1 ground connection,
As shown from the above formula, Vc1 is zero, and sampled voltage E is zero, thus, and distribution line ground fault detection in above-described embodiment
According to the change of sampled voltage, device can judge whether supply line occurs earth fault, can identify line quickly and accurately
Road earth fault.
The ground fault detection device based on capacitance partial pressure and big data analysis in the above-described embodiments also has following
Technical characteristic:
Sampling unit 20 also includes the current sample module 22 for gathering distribution line current information, current sample module
22 include the first mutual inductor L1 for gathering distribution line current information, and the two ends of the first mutual inductor L1 are connected in series with
The 4th resistance R4 being serially connected and the 5th resistance R5, the two ends of the first mutual inductor L1 are also connected in parallel to the first voltage stabilizing two pole
One end ground connection of pipe W1, the first mutual inductor L1, has and sample processing unit 10 between the 4th resistance R4 and the 5th resistance R5
Be connected the second exit, sample processing unit 10 described second exit gather sample rate current I, described second exit with
Being also associated with the 3rd electric capacity C3 between sample processing unit 10, the 3rd electric capacity C3 one end is connected with described second exit, and the 3rd
The electric capacity C3 other end is grounded, and the two ends of the 3rd electric capacity C3 are also connected in parallel to the second Zener diode W2.Specifically, according to me
State's operation power code, when singlephase earth fault occurs, power circuit can also run about 2 hours, say, that transports in spite of illness
Falling of row also has electric current to flow through in circuit.When supply line normally works, the voltage sample module 21 of sampling unit 20 is permissible
Collecting normal sampled voltage E, the current sample module 22 of sampling unit 20 can collect normal sample rate current I.When
When there is earth fault, sampled voltage E is in theory by vanishing, and sample rate current I can occur moment change occur in earth fault.
After there is earth fault, within a certain period of time, sampled voltage E is theoretically zero, and sample rate current I can be maintained at a certain stationary value.
When the supply line that earth fault occurs has a power failure, sampled voltage E and sample rate current I is zero simultaneously.Distribution in this embodiment
Line-to-ground fault monitoring device, the voltage and current information of the supply line that simultaneously samples, when sampled voltage is zero and sampling electricity
When stream is not zero, it is possible to judge that the single phase power supply circuit being connected with input 211 in this distribution line there occurs single-phase earthing
Fault, fault verification accuracy rate is high, and this distribution line ground fault detection device relaxes hardware system to measurement instantaneity
Requiring, belonging to steady state measurement technology after a kind of ground connection, simple, reliability is high, and accuracy rate is high.
In the above-described embodiments, the two ends of the 3rd resistance R3 are also connected in parallel to the second electric capacity C2, and its effect is maintenance the
Three resistance R3 both end voltage are stable so that the sampled voltage of the first output output between the second resistance R2 and the 3rd resistance R3
E keeps stable, it is to avoid the interference in distribution line causes the fluctuation of sampled voltage.After there is earth fault in supply line, the
Three resistance R3 and the second electric capacity C2 form RC discharge loop and make the second electric capacity C2 electric discharge.Sample processing unit 10 be also associated with for
Gather the height sensor 11 of distribution line height and for gathering the humidity sensor 12 of ambient humidity near distribution line, by
Ambient humidity near this elevation information that can gather supply line in real time and distribution line, thus can be to supply line
The C4 of distribution capacity over the ground be corrected, improve sampled voltage E accuracy, improve earth fault judge accuracy.Sampling
Processing unit 10 is also connected with communication module 13.Specifically, each single phase power supply line of the three-phase power line of distribution line
It has been respectively coupled above-mentioned distribution line ground fault detection device, the distribution line ground connection on every single phase power supply circuit on road
Fault monitoring device can be by communication module 13 and the distribution line earth fault prison on two other single phase power supply circuit
Survey device to carry out communicating with obtaining the sampled voltage of two other single phase power supply circuit, and calculate the sampling of this single phase power supply circuit
The difference of the sampled voltage of voltage and two other single phase power supply circuit and the sampling of described difference and other two-phase unilines
The percent value of voltage, is thus further ensured that the accuracy that earth fault judges, specifically, if this single phase power supply circuit
The sampled voltage of difference and other two-phase unilines of sampled voltage of sampled voltage and two other single phase power supply circuit
Percent value be more than a certain preset value, then illustrate that the sampled voltage of this single phase power supply circuit is abnormal, thus further ensure
The accuracy that earth fault judges.Distribution line ground fault detection also can pass through communication module 13 and data transmission unit
(DTU, Data Transfer Unit) carries out communication carrying out information transmission, sends sampled data or failure alarm signal.Separately
Outward, in the different branch of distribution line or different segmentation, above-mentioned distribution line ground fault detection, diverse location all can be set
Distribution line ground fault detection all can be carried out through data transmission unit (DTU) and background server by communication module 13
Information is transmitted.
As another purpose of Fig. 3 to Fig. 5 embodiment of the present invention is to provide one to divide based on capacitance partial pressure and big data
The ground fault detection method of analysis, the method comprises the following steps:
S10: use above-mentioned ground fault detection device to gather the sampled voltage E of the uniline in distribution line；
S20: the described sampled voltage E and the first predeterminated voltage E1 of the uniline collecting are compared, if described adopt
Sample voltage E is less than the first predeterminated voltage E1, it is determined that this uniline is in power down mode；If described sampled voltage E more than or
Equal to the first predeterminated voltage E1, then the size of more described sampled voltage and the second predeterminated voltage E2, described second predeterminated voltage
E2 is more than described first predeterminated voltage E1；
S30: described sampled voltage E is more than or equal to the second predeterminated voltage E2, then more described sampled voltage E and the 3rd pre-
If the size of voltage E3, if described sampled voltage E is more than the 3rd predeterminated voltage E3, then judge that this uniline is working properly,
Described 3rd predeterminated voltage E3 is more than described second predeterminated voltage E2；If described sampled voltage E is less than the second predeterminated voltage E2,
Then judge this uniline generation earth fault.
Specifically, above-mentioned the first predeterminated voltage E1, the second predeterminated voltage E2 and the 3rd predeterminated voltage E3 are bases
The real system operational factor of 10KV distribution line and the threshold value that sets, calculate according to theory, and when supply line has a power failure, it is adopted
Sample voltage E is zero, but in view of the factor such as distribution capacity, adjacent phase line mutual voltage over the ground, actual samples voltage may not be
Zero, in order to ensure the accuracy that supply line's power down mode judges, the method sets the first predeterminated voltage E1；Work as supply line
When there is earth fault, the theoretical sampled voltage that calculates is zero, but, it is contemplated that the distribution capacity over the ground during supply line's ground connection is simultaneously
Not being definitely zero and still suffering from electric current, now the actual value of sampled voltage E is not zero, accurate in order to ensure that earth fault judges
Property, the method sets the second predeterminated voltage E2 according to systematic parameter and statistics；When supply line normally works, theoretical
Calculating sampled voltage E is certain certain value, it is contemplated that the swing of supply line cause height change, ambient humidity change or
The factors such as voltage ripple of power network, can there is fluctuation in sampled voltage E, it is pre-that the method sets the 3rd according to systematic parameter and statistics
If voltage E3 is to guarantee that sampled voltage E is in normal operating conditions more than supply line during the 3rd predeterminated voltage E3, provides and judge
The accuracy of result.In above-mentioned enforcement, the value of the first predeterminated voltage E1 is 30 volts, and the value of the second predeterminated voltage E2 is 70 volts,
The value of the 3rd predeterminated voltage E3 is 150 volts.Distribution line ground fault detection method in this example can be according to sampled voltage
Change judge whether supply line occurs earth fault, by arranging the first electric capacity of being grounded, when tested distribution line occurs
After earth fault, can obtain metastable sampled voltage by the voltage acquisition module that capacitance resistance is constituted, this fault is supervised
Survey device and monitoring method relax the requirement to measurement instantaneity for the hardware, belong to steady state measurement technology after supply line's ground connection,
Line-to-ground fault can be identified quickly and accurately.Specifically, after electric power system generation singlephase earth fault, system power supply
Can also work about 2 hours, in these 2 hours, earth fault may be continued for, i.e. voltage-to-ground is zero always, also has
One be ground connection be batch (-type) ground connection, ground path voltage-to-ground is not zero always.In the ground fault detection device of the present invention,
Capacitance resistance composition ground voltage sample circuit is in discharge process, owing to discharge process is Millisecond, and can be by measurement
Capacitance voltage is to determine whether power circuit is grounded；Even batch (-type) ground connection, electric capacity both end voltage is also at charging and discharging shape
State, owing to discharge process is Millisecond, still can obtain metastable sampled voltage, relaxes hardware instant to measurement
Property require.
In the ground fault detection method that above-described embodiment provides, also have steps of:
Step S10 also includes, the sample rate current I of the uniline in collection distribution line；
Described step S20 is, if described sampled voltage E is less than the first predeterminated voltage E1 and described sample rate current I is equal to
Zero, it is determined that this uniline is in power down mode；If described sampled voltage E is more than or equal to the first predeterminated voltage E1 and described
Sample rate current I is not equal to zero, then the size of more described sampled voltage E and the second predeterminated voltage E2；
Described step S30 is, described sampled voltage E is more than or equal to the second predeterminated voltage E2 and described sample rate current I not
Equal to zero, then the size of more described sampled voltage E and the 3rd predeterminated voltage E3, if described sampled voltage E is pre-more than the 3rd
If voltage E3, then judge that this uniline is working properly；If described sampled voltage E is less than the second predeterminated voltage E2 and described adopts
Sample electric current I is not equal to zero, then judge this uniline generation earth fault.
Specifically, according to China's operation power code, when singlephase earth fault occurs, power circuit can also run 2
About little Shi, say, that falling of running in spite of illness also has electric current to flow through in circuit.Distribution line ground connection event in this embodiment
Barrier monitoring method, the voltage and current information of the supply line that simultaneously samples, when sampled voltage is more than or equal to the first predeterminated voltage
And it is less than the second predeterminated voltage, sample rate current is not zero simultaneously, it is possible to judge that this single phase power supply circuit there occurs single-phase earthing
Fault, fault verification accuracy rate is high, and this distribution line ground fault detection device relaxes hardware system to measurement instantaneity
Requiring, belonging to steady state measurement technology after a kind of ground connection, simple, reliability is high, and accuracy rate is high.
Further, in above-described embodiment, described step S30 also includes: if described sampled voltage E presets more than the 3rd
Voltage E3, the described sampled voltage E of height H, ambient humidity M correction according to this uniline, after correction, described sampled voltage E is big
In the 3rd predeterminated voltage E3, then judge that this uniline is working properly.For example, when height H is more than 15m, sampled voltage is verified；
When ambient humidity M is more than 80%, verify sampled voltage；If in addition, supply line's sampling insulated wire, can according in advance than
To bare conductor and difference on voltage-to-ground measured value for the insulated wire, it is possible at relatively sampled voltage E and the 3rd predeterminated voltage
Adaptive measuring bare conductor and insulated conductor voltage-to-ground value during E3, and it is calibrated to perfect condition.
Further, described step S30 also includes S31: if described sampled voltage E is less than the second predeterminated voltage E2, meter
Calculate the difference of the sampled voltage E of this uniline and the sampled voltage E of other two-phase unilines and described difference with other two
The percent value of the sampled voltage of phase uniline, if percent value is more than the first predetermined threshold value, then judges this uniline
There is earth fault, thus further ensure the accuracy that earth fault judges.Specifically, the first predetermined threshold value can root
Determining according to systematic parameter or statistics, for example, the first predetermined threshold value is supply line's sampled voltage E numerical value when normally working
10%th, 15% or 20%, thus can avoid erroneous judgement, discharge environmental factor and the impact on sampled voltage for the power network fluctuation.
Further, described step S30 also includes step S32: occur in history according to power supply branch road each in distribution network
The frequency of earth fault, the length of each power supply branch road and whole distribution network total line length ratio, utilize Bayesian formula meter
Calculate the probability from each power supply branch road Li for earth fault A of generation.Specifically, background system is according to different circuits in history
Break down frequency, in conjunction with the instruction of actual alarm signal location, provides different warning path failure probability, for example: Line 1 road is sent out
The probability of raw fault is 16%, and the probability of No. 2 line failures is 7%, thus facilitates maintenance personal quickly to position fault wire
Road and position.
If the fault statistics that supply line's several years of certain power supply station management occur is: circuit 1, line fault probability is
P1, a length of L1 (unit is km) of circuit；Circuit 2, line fault probability is P2, and (unit is thousand to a length of L2 of circuit
Rice)；···；Circuit N, line fault probability is PN, a length of LN (unit is km) of circuit.Bayesian formula is utilized to enter
Row probability analysis, then earth fault A of generation from the probability of circuit Li (1≤i≤N) is:
Wherein, P (Li) expression accounting in whole supply line total kilometrage for the circuit Li, and P (A | Li) if representing circuit Li
The probability breaking down in the fault statistics that dry year occurs, utilizes above-mentioned Bayesian formula to be predicted fault, and event is occurring
When barrier is reported to the police, malfunction elimination can be carried out according to the line fault probability of actual alarm path and prediction, improve failture evacuation effect
Rate.Thus, this ground fault detection method, by the statistics breaking down in the employing principle of capacitive divider distribution line several years
Data carry out big data analysis, efficiently solve singlephase earth fault warning problem, and earth fault warning is timely, accuracy rate is high.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Although
With reference to previous embodiment, the present invention is described in detail, it will be understood by those within the art that: it still may be used
Modify with the technical scheme described in foregoing embodiments, or equivalent is carried out to wherein portion of techniques feature；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
1. the ground fault detection device based on capacitance partial pressure and big data analysis, including sample processing unit and sampling are single
Unit, it is characterised in that described sampling unit includes the voltage sample module for gathering distribution line voltage-to-ground, described voltage
Sampling module includes the input for being connected with distribution line, and described input is connected with the first diode, the second electricity in turn
Resistance and the 3rd resistance, described 3rd resistance eutral grounding, it is also associated with the first electric capacity between described input and described first diode,
One end of described first electric capacity is connected with described input, the other end ground connection of described first electric capacity, the two of described first electric capacity
End is also connected in parallel to the first resistance, has and described sample processing unit phase between described second resistance with described 3rd resistance
The first exit even, described sample processing unit gathers sampled voltage at described first exit.
2. ground fault detection device according to claim 1, it is characterised in that described sampling unit also includes for adopting
The current sample module of collection distribution line current information, described current sample module includes for gathering distribution line current information
The first mutual inductor, the two ends of described first mutual inductor are connected in series with the 4th resistance being serially connected and the 5th resistance,
The two ends of described first mutual inductor are also connected in parallel to the first Zener diode, one end ground connection of described first mutual inductor,
There is between described 4th resistance and described 5th resistance the second exit being connected with described sample processing unit, described sampling
Processing unit gathers sample rate current at described second exit, also connects between described second exit and described sample processing unit
Being connected to the 3rd electric capacity, described 3rd electric capacity one end is connected with described second exit, described 3rd electric capacity other end ground connection, described
The two ends of the 3rd electric capacity are also connected in parallel to the second Zener diode.
3. ground fault detection device according to claim 1 and 2, it is characterised in that the two ends of described 3rd resistance are also
It is connected in parallel to the second electric capacity.
4. ground fault detection device according to claim 1 and 2, it is characterised in that described sample processing unit also connects
It is connected to the height sensor for gathering distribution line height and for gathering the humidity sensor of ambient humidity near distribution line
Device.
5. ground fault detection device according to claim 1 and 2, it is characterised in that described sample processing unit also connects
Connect communication module.
6. the ground fault detection method based on capacitance partial pressure and big data analysis, it is characterised in that the method include with
Lower step:
S10: use above-mentioned ground fault detection device to gather the sampled voltage of the uniline in distribution line；
S20: described sampled voltage and first predeterminated voltage of the uniline collecting are compared, if described sampled voltage is little
In the first predeterminated voltage, it is determined that this uniline is in power down mode；If described sampled voltage is preset more than or equal to first
Voltage, the then size of more described sampled voltage and the second predeterminated voltage, described second predeterminated voltage is preset more than described first
Voltage；
S30: described sampled voltage is more than or equal to the second predeterminated voltage, then more described sampled voltage and the 3rd predeterminated voltage
Size, if described sampled voltage is more than the 3rd predeterminated voltage, then judges that this uniline is working properly, and the described 3rd presets electricity
Pressure is more than described second predeterminated voltage；If described sampled voltage is less than the second predeterminated voltage, then judge that this uniline occurs
Earth fault.
7. ground fault detection method according to claim 6, it is characterised in that
Described step S10 also includes, the sample rate current of the uniline in collection distribution line；
Described step S20 is, if described sampled voltage is less than the first predeterminated voltage and described sample rate current is equal to zero, it is determined that should
Uniline is in power down mode；If described sampled voltage is more than or equal to the first predeterminated voltage and described sample rate current
In zero, then the size of more described sampled voltage and the second predeterminated voltage；
Described step S30 is, described sampled voltage is more than or equal to the second predeterminated voltage and described sample rate current is not equal to zero, then
Relatively more described sampled voltage and the size of the 3rd predeterminated voltage, if described sampled voltage is more than the 3rd predeterminated voltage, then judge
This uniline is working properly；If described sampled voltage is less than the second predeterminated voltage and described sample rate current is not equal to zero, then
Judge this uniline generation earth fault.
8. the ground fault detection method according to claim 6 or 7, it is characterised in that described step S30 also includes: as
Really described sampled voltage is more than the 3rd predeterminated voltage, the height according to this uniline, the described sampled voltage of ambient humidity correction,
After correction, described sampled voltage is more than the 3rd predeterminated voltage, then judge that this uniline is working properly.
9. the ground fault detection method according to claim 6 or 7, it is characterised in that described step S30 also includes S31:
If described sampled voltage is less than the second predeterminated voltage, calculate sampled voltage and other two-phase unilines of this uniline
The percent value of the sampled voltage of the difference of sampled voltage and described difference and other two-phase unilines, if described percentage
Value is more than the first predetermined threshold value, then judge this uniline generation earth fault.
10. ground fault detection method according to claim 9, it is characterised in that described step S30 also includes step
S32: according to power supply branch road each in distribution network occur in history the frequency of earth fault, each power supply branch road length with entirely join
Electric network total line length ratio, utilizes Bayesian formula to calculate occur earth fault A from each power supply branch road Li general
Rate.
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