CN110286297A - A kind of single-phase grounded malfunction in grounded system of low current line selection apparatus and method - Google Patents
A kind of single-phase grounded malfunction in grounded system of low current line selection apparatus and method Download PDFInfo
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- 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
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Abstract
The invention discloses a kind of single-phase ground fault line selecting method of small-electric current grounding system, it include: after the three-phase voltage signal for the bus that intelligent controller is acquired according to voltage transformer judges to determine that singlephase earth fault occurs for small current neutral grounding system, capacitor with constant capacitance and the resistor with fixed resistance value are put into neutral ground branch road preset duration by fling-cut switch respectively；Multiple current transformers acquire current signal of a plurality of route to be measured in the preset duration respectively, and the current signal is transferred to the intelligent controller by the data acquisition device；Intelligent controller analyzes the phase changing capacity amplitude variable quantity of the zero-sequence current of a plurality of route to be measured according to the current signal respectively；The phase changing capacity amplitude variable quantity of the zero-sequence current of the more a plurality of route to be measured of intelligent controller, filters out phase changing capacity and amplitude variable quantity is maximum route, then is faulty line.
Description
Technical field
The present invention relates to relay protections, distribution network technology field, particularly relate to a kind of single-phase earthing of small current earthing system
Fault line selection device and method.
Background technique
In intermediate distribution system, in order to improve power supply reliability using neutral non-effective grounding mode, generally use
Through grounding through arc mode with the electric current of compensated line direct-to-ground capacitance, but bring asking for single-phase earth fault line selection difficulty
Topic.If faulty line cannot be selected in time and be cut off, it is easy to lead to fault pervasion and power outage.
Numerous methods, including function component method, injection method, method of perturbation, Harmonic Method etc. are proposed for failure line selection at present.But
It is due to the efficiency that actual field situation is complicated, control is difficult, these unobvious various reasons of fault signature lead to present route selection
Still not high, the power outage as caused by singlephase earth fault happens occasionally.
Therefore, failure line selection remains the problem in distribution network systems, needs a kind of efficient fault line selection device and side
Method.
Summary of the invention
In view of this, it is an object of the invention to propose that a kind of low current of faulty line that can be improved route selection efficiency connects
Ground system single-phase earth fault route selecting device and method.
Based on above-mentioned purpose single-phase grounded malfunction in grounded system of low current line selection apparatus provided by the invention, comprising:
Intelligent controller, capacitor, resistor, fling-cut switch, data acquisition device, voltage transformer and multiple electric currents
Mutual inductor；
The voltage transformer is used to acquire the three-phase voltage signal of bus, and the data acquisition device and the voltage are mutual
Sensor connection, by the information collection of voltage transformer into data acquisition device；The multiple current transformer is respectively used to adopt
Collect the current signal of a plurality of route to be measured；The data acquisition device is separately connected with the multiple current transformer, will be multiple
The information collection of current transformer is into data acquisition device；The capacitor and the capacitor in parallel；The intelligent control
Device can control the switching device, and the capacitor and the resistor are put into respectively in neutral ground branch；It is described
It is connected between intelligent controller and the data acquisition device by tie line.
The fling-cut switch includes the silicon-controlled of two parallel connections and Opposite direction connection in one of the embodiments, it is described can
The parallel branch branch in series that silicon and the capacitor and the resistor are formed is controlled, the neutral ground branch is parallel to
On the road.
The intelligent controller includes: in one of the embodiments,
Signal receiving unit, for receiving the three-phase voltage signal and current signal of the data acquisition device acquisition；
Signal processing unit, for handling three-phase voltage signal, the multiple electric currents letter that the signal receiving unit receives
Number, the phase changing capacity and amplitude variable quantity of the zero-sequence current of a plurality of route to be measured are analyzed, phase changing capacity and width are screened
Value variable quantity is maximum route；
Control unit selects the switching moment for the processing result of receipt signal processing unit, adjust switching it is default when
It is long, and Continuity signal is exported to the switching device.
The present invention also provides a kind of single-phase ground fault line selecting method of small-electric current grounding system, comprising:
Judge to determine small current neutral grounding in the three-phase voltage signal for the bus that intelligent controller is acquired according to voltage transformer
After singlephase earth fault occurs for system, fling-cut switch is by the capacitor with constant capacitance and the resistance with fixed resistance value
Device puts into neutral ground branch road preset duration respectively；
Multiple current transformers acquire current signal of a plurality of route to be measured in the preset duration respectively, and will be described
Current signal is transferred to the intelligent controller by the data acquisition device；
Intelligent controller analyzes the phase changing capacity of the zero-sequence current of a plurality of route to be measured according to the current signal respectively
Amplitude variable quantity；
The phase changing capacity amplitude variable quantity of the zero-sequence current of the more a plurality of route to be measured of intelligent controller, filters out phase
Variable quantity and amplitude variable quantity are maximum route, then are faulty line.
The fling-cut switch by the capacitor with constant capacitance and has fixed resistance in one of the embodiments,
The resistor of value puts into neutral ground branch road preset duration respectively, comprising:
The fling-cut switch is by the capacitor with constant capacitance and the resistor with fixed resistance value, repeatedly respectively
Neutral ground branch road preset duration is put into, the value of each preset duration is all different.
The preset duration is 20 milliseconds to 100 milliseconds in one of the embodiments,.
The phase changing capacity and width of the zero-sequence current for analyzing a plurality of route to be measured respectively in one of the embodiments,
It is worth variable quantity, comprising:
The zero-sequence current for calculating separately a plurality of route to be measured, further according to the variation of the zero-sequence current in preset duration, analysis
The phase change and amplitude of the zero-sequence current of a plurality of route to be measured change.
The three-phase voltage for the bus that the intelligent controller is acquired according to voltage transformer in one of the embodiments, is believed
Number judge determine small current neutral grounding system occur singlephase earth fault include:
Signal receiving unit receives the three-phase voltage value of the bus of voltage transformer acquisition；
Signal processing unit handles three-phase voltage value, compare the sum of three-phase voltage value and preset voltage threshold it
Between size relation, and comparison result is transmitted to control unit by signal feedback unit；If the sum of three-phase voltage value is greater than
Preset voltage threshold then judges that singlephase earth fault occurs for small current neutral grounding system；
After preset time, if control unit still judges that singlephase earth fault occurs for system, it is determined that low current
Singlephase earth fault occurs for earthed system.
The preset voltage threshold is greater than one times of normal voltage value in one of the embodiments, less than three times
Normal voltage value.
From the above it can be seen that single-phase grounded malfunction in grounded system of low current line selection apparatus provided by the invention and side
Method, by fling-cut switch, issues control signal, quickly controls capacitor when intelligent controller determines, and singlephase earth fault occurs
In device and resistor access neutral ground branch, changing neutral ground circuit in short-term occurs the zero-sequence current of faulty line
Phase jump and amplitude mutation, control signal is synchronous with the sampling pulse clock synchronization of multiple current transformers, when being put by acquisition
The current signal for the multiple routes to be measured carved simultaneously analyzes the route that maximum variation occurs with amplitude for zero-sequence current variation phase.It throws
The control signal repeated encoding control closed is cut, it can multiple switching.Have the advantages that (1) haves no need to change a main equipment
Technical requirements, ground integrity requirement.In transient process, each adjustable condenser and adjustable resistor ground connection control loop are thrown
The angle of incidence controls between 20 milliseconds to 100 milliseconds, can generate the Sudden Changing Rate of the phase and amplitude of biggish zero-sequence current simultaneously
Complete sample waveform is obtained, and can guarantee and do not change earthing mode for a long time in order to avoid expanding failure；(2) pass through acquisition tunable capacitor
The first current signal and the second current signal in device and adjustable resistor investment preset duration, simple computation zero-sequence current, fastly
Speed ratio changes compared with phase change and amplitude, and runing time is short；(3) value and switching of adjustable condenser and adjustable resistor is default
Duration may be repeated coding-control, can repeatedly put into neutral ground branch road, can repeatedly carry out select-line analysis, guarantee
Route selection accuracy.
Detailed description of the invention
Fig. 1 is the circuit diagram of the single-phase grounded malfunction in grounded system of low current line selection apparatus of the embodiment of the present invention；
Fig. 2 is the signal flow signal of the single-phase grounded malfunction in grounded system of low current line selection apparatus of the embodiment of the present invention
Figure；
Fig. 3 is the flow chart of single-phase ground fault line selecting method of small-electric current grounding system of the embodiment of the present invention；
Fig. 4 is that the intelligent controller of the embodiment of the present invention adjusts the stream of predetermined capacitance, predetermined resistance value and preset duration
Cheng Tu.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
Referring to Fig. 1, the present invention provides a kind of single-phase grounded malfunction in grounded system of low current line selection apparatus, comprising:
Intelligent controller DO, capacitor L0, resistor R0, switching device, data acquisition device, voltage transformer pt0And
Multiple Current Transmits1,CT2,…….CTn；
The voltage transformer is used to acquire the three-phase voltage signal of bus, and the data acquisition device and the voltage are mutual
Sensor connection, by the information collection of voltage transformer into data acquisition device；The multiple current transformer is respectively used to adopt
Collect the current signal of a plurality of route to be measured；The data acquisition device is separately connected with the multiple current transformer, will be multiple
The information collection of current transformer is into data acquisition device；The capacitor and the capacitor in parallel；The intelligent control
Device can control the switching device, and the capacitor and institute's resistor are put into respectively in neutral ground branch；The intelligence
It can control and connected between device and the data acquisition device by tie line.
It should be noted that in small current neutral grounding system grounding transformer through grounding through arc, a plurality of route to be measured from
Bus is drawn.Neutral ground branch is connect with grounding transformer.
Neutral ground branch can be specifically grounded in a manner of arc suppression coil L.It is multiple when single-phase fault ground connection occurs
The capacitive earth current of route non-faulting phase to be measured can constitute circuit by grounding point and flow back to bus, cause grounding point fault current
Excessively high, the arc suppression coil compensates the capacitive earth current of each route non-faulting phase using overcompensation mode, this is generally to adopt
Compensation way, this application repeat no more concrete principle.
Intelligent controller is used to detect the three-phase voltage signal of bus and the current signal of multiple routes to be measured, to detection
Voltage, current signal handled and analyzed, to determine whether power grid occurs singlephase earth fault, based on the analysis results, fit
When control switching device put into, cut off adjustable condenser with predetermined capacitance or with the adjustable of predetermined resistance value
Resistor, and the route that is out of order is analyzed and determined further according to the processing of the current signal of each route to be measured of detection.Specifically, described
Intelligent controller includes signal receiving unit, signal processing unit and control unit.
Wherein, signal receiving unit, for receiving the signal of the data acquisition device communication, signal is specially three-phase electricity
Press signal and current signal；
Signal processing unit, for handling three-phase voltage signal, the multiple electric currents letter that the signal receiving unit receives
Number, the phase changing capacity amplitude variable quantity of the zero-sequence current of a plurality of route to be measured is analyzed, phase changing capacity and amplitude are screened
Variable quantity is maximum route；
Control unit selects the switching moment for the processing result of receipt signal processing unit, adjusts preset duration, and
Continuity signal is exported to the switching device.
Switching device can be mechanical high-speed switch.It may be electronic power switch, such as two parallel connections and reversed
What is connected is silicon-controlled.
Specifically, switching device is the silicon-controlled of two parallel connections and Opposite direction connection, the mechanical high-speed switch with it is described
The parallel branch branch in series that capacitor and the resistor are formed, is parallel to the neutral ground branch.
Described control unit can control to adjust the triggering controlled silicon conducting.
Optionally, the data acquisition device may include current signal sensor and voltage signal sensor.
Referring to Fig. 2, the single-phase grounded malfunction in grounded system of low current line selection apparatus of the embodiment of the present invention is when in use, letter
Number process of circulation includes the voltage signal of voltage transformer acquisition and the current signal of multiple current transformers acquisition, flows into intelligence
Controller, successively after the processing of signal receiving unit, signal processing unit and control unit, intelligent controller output conducting letter
Number, Continuity signal flows into electronic power switch, so far completes control signal circulation.
Fig. 3 is please referred to, the present invention also provides a kind of single-phase ground fault line selecting method of small-electric current grounding system, comprising:
S100 judges to determine low current in the three-phase voltage signal for the bus that intelligent controller is acquired according to voltage transformer
After singlephase earth fault occurs for earthed system, fling-cut switch is by the capacitor with constant capacitance and with fixed resistance value
Resistor puts into neutral ground branch road preset duration respectively；
S200, multiple current transformers acquire a plurality of route to be measured current signal in the preset duration respectively, and will
The current signal is transferred to the intelligent controller by the data acquisition device；
S300, intelligent controller calculate separately the zero-sequence current of a plurality of route to be measured according to the current signal, further according to
The phase changing capacity of the first zero-sequence current of a plurality of route to be measured is analyzed in the variation of zero-sequence current in the preset duration respectively
Amplitude variable quantity；
S400, the phase changing capacity of the first zero-sequence current of the more a plurality of route to be measured of intelligent controller and the second zero sequence electricity
The amplitude variable quantity of stream, filters out phase changing capacity and amplitude variable quantity is maximum route, then is faulty line.
In step S100, intelligent controller is small according to the three-phase voltage signal judgement determination for the bus that voltage transformer acquires
Singlephase earth fault, which occurs, for current grounding system can specifically include:
Signal receiving unit receives the three-phase voltage value of the bus of voltage transformer acquisition；
Signal processing unit handles three-phase voltage value, compare the sum of three-phase voltage value and preset voltage threshold it
Between size relation, and comparison result is transmitted to control unit by signal feedback unit；If the sum of three-phase voltage value is greater than
Preset voltage threshold then judges that singlephase earth fault occurs for small current neutral grounding system；
After preset time, if control unit still judges that singlephase earth fault occurs for system, it is determined that low current
Singlephase earth fault occurs for earthed system.
It should be noted that the sum of three-phase voltage value is zero under normal circumstances, the sum of three-phase voltage value is risen to when failure
The normal voltage value of three times, therefore voltage threshold is set between one times and three times normal voltage value.
Preferably, in step S100, the fling-cut switch is by the capacitor with constant capacitance and has fixed resistance
The resistor of value puts into neutral ground branch road preset duration respectively, may include: that the fling-cut switch will have fixed electricity
The capacitor of capacitance and resistor with fixed resistance value repeatedly put into neutral ground branch road preset duration respectively, can
With the mutation of the preferably phase and amplitude of the zero-sequence current of manufacturing fault route, and multiple interpretation of result route selection is integrated, into one
Step improves route selection accuracy.
Specifically, the predetermined capacitance is greater than the capacitance of arc suppression coil overcompensation.The tunable capacitor C0It is default
The adjustment of capacitance, need to be in view of balancing out the part of arc suppression coil overcompensation while also to balance out the non-faulting of faulty line
The earthing capacitance current of phase, so that the zero-sequence current direction of faulty line is to flow to route from bus, mutation is flowed to from route
Bus causes faulty line and the phase of the zero-sequence current of non-faulting line significantly different.In the case where unknown failure route,
It need to be on the basis of balancing out arc suppression coil overcompensation part to C0Predetermined capacitance to big adjustment.
Specifically, the value of the resistance value can be determined according to the fault point earth current size of required control.
The investment adjustable resistance R with predetermined resistance value0Period, fault point earth current flow through active component, make faulty line
The amplitude of zero-sequence current mutate, the amplitude of the zero-sequence current of non-fault line is unaffected.In this, as judging failure
One of foundation of route.Meanwhile the active component in the earth current of fault point can also generate centainly the phase of zero-sequence current
Change.Adjustable resistor R0Predetermined resistance value need to be greater than minimum resistance Rmin,Wherein UpkFor neutral point voltage
Peak value, IpkFor fault point earth current peak value.
Preferably, in step S100, the fling-cut switch is by the capacitor with constant capacitance and has fixed resistance
The resistor of value puts into neutral ground branch road preset duration respectively, comprising:
The fling-cut switch by the capacitor with constant capacitance and with fixed resistance value=resistor, repeatedly point
Not Tou Ru neutral ground branch road preset duration, the value of each preset duration is all different.Preset duration is repeatedly adjusted,
The value of each preset duration is not identical, can the preferably phase and amplitude of the zero-sequence current of manufacturing fault route mutation, and
Comprehensive multiple interpretation of result route selection, further increases route selection accuracy.Referring to Fig. 4, adjusting predetermined capacitive for intelligent controller
The flow chart of value, predetermined resistance value and preset duration.Specifically, after putting into adjustable condenser and adjustable resistor, according to neutrality
Point voltage adjustment is closed a floodgate (cutting out) moment, so that inrush phenomenon Sudden Changing Rate increases.Preferably, selection is in neutral point voltage waveform
In, stage of voltage value peak value closes a floodgate, and preset duration is 20 milliseconds to 100 milliseconds.Larger Sudden Changing Rate can be generated and obtained
Complete sample waveform, and can guarantee and do not change earthing mode for a long time in order to avoid expanding failure.
In step S200, the intelligent controller considers the delay time of acquisition signal and conversion signal, in capacitor
The voltage and current signals Sudden Changing Rate generated after the moment, which is put into, with resistor carries out centralized processing analysis.
In step S100, the switching moment is repeatedly adjusted and/or when preset duration, step S200~step S400, also phase
It repeatedly successively carries out with answering, according to multiple analysis as a result, being comprehensively compared, maximum line is mutated to zero-sequence current in route
Road is determined as faulty line.
When in use, voltage transformer acquires a kind of single-phase grounded malfunction in grounded system of low current line selection apparatus of the invention
The three-phase voltage value of bus, and voltage signal is transmitted to data acquisition device, it send through data communication to signal receiving unit, then
Compare the size relation between the sum of three-phase voltage value and voltage threshold by signal processing unit, and comparison result is transmitted to
Control unit.When control unit persistently connects within a preset time judge that singlephase earth fault occurs, then starts to carry out failure choosing
Line.When route selection, the value of investment preset duration is varied multiple times, and exports Continuity signal to fling-cut switch, controls capacitor and resistance
Device preset duration.Multiple current transformers acquire multiple routes to be measured respectively, and each adjustable condenser and adjustable resistor are certainly
The moment is put into the current signal cut out in the moment.Acquisition gained signal is transmitted to signal processing list by signal receiving unit
Member, in signal processing unit, the phase changing capacity and amplitude of the corresponding each zero-sequence current for calculating multiple routes to be measured become
Change amount, and be comprehensively compared multiple as a result, filtering out phase changing capacity and amplitude variable quantity is maximum route, as failure
Route.
Single-phase grounded malfunction in grounded system of low current line selection apparatus of the invention and method occur when intelligent controller determines
When singlephase earth fault, control signal is issued, by fling-cut switch, capacitor is quickly controlled and resistor accesses neutral ground
In branch, changing neutral ground circuit in short-term makes the zero-sequence current of faulty line that phase jump and amplitude mutation, control occur
Signal is synchronous with the sampling pulse clock synchronization of multiple current transformers, is believed by the electric current of multiple routes to be measured at acquisition investment moment
Number and analyze zero-sequence current variation phase and the maximum route changed occurs for amplitude.The control signal repeated encoding of fling-cut switch
Control, can multiple switching.Have the advantages that (1) haves no need to change the technical requirements of a main equipment, ground integrity is wanted
It asks.In transient process, each adjustable condenser and adjustable resistor ground connection control loop making time control are at 20 milliseconds to 100
Between millisecond, the Sudden Changing Rate of the phase and amplitude of biggish zero-sequence current can be generated and obtain complete sample waveform and protect
Card does not change earthing mode for a long time in order to avoid expanding failure；(2) it is put into preset duration by acquisition capacitor and resistor
Current signal, simple computation zero-sequence current, quickly relatively phase change and amplitude variation, runing time is short；(3) capacitor and electricity
The value of device and the preset duration of switching are hindered, may be repeated coding-control, can repeatedly be put into neutral ground branch road, it can be more
Secondary carry out select-line analysis guarantees route selection accuracy.
It should be noted that all statements for using " first " and " second " are for differentiation two in the embodiment of the present invention
The non-equal entity of a same names or non-equal parameter, it is seen that " first " " second " only for the convenience of statement, does not answer
It is interpreted as the restriction to the embodiment of the present invention, subsequent embodiment no longer illustrates this one by one.
It should be understood by those ordinary skilled in the art that: the discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples；Under thinking of the invention, above embodiments
Or can also be combined between the technical characteristic in different embodiments, step can be realized with random order, and be existed such as
Many other variations of the upper different aspect of the invention, for simplicity, they are not provided in details.
In addition, to simplify explanation and discussing, and in order not to obscure the invention, it can in provided attached drawing
To show or can not show the well known power ground connection of other components.Furthermore, it is possible to show dress in block diagram form
It sets, to avoid obscuring the invention, and this has also contemplated following facts, i.e., about the embodiment party of these block diagram arrangements
The details of formula be height depend on will implement platform of the invention (that is, these details should be completely in art technology
Within the scope of the understanding of personnel).In the case where elaborating detail to describe exemplary embodiment of the present invention, to this field
It is readily apparent that it can without these specific details or these details change for technical staff
In the case where implement the present invention.Therefore, these descriptions should be considered as illustrative rather than restrictive.
Although having been incorporated with specific embodiments of the present invention, invention has been described, according to retouching for front
It states, many replacements of these embodiments, modifications and variations will be apparent for those of ordinary skills.
The embodiment of the present invention be intended to cover fall into all such replacements within the broad range of appended claims,
Modifications and variations.Therefore, all within the spirits and principles of the present invention, any omission, modification, equivalent replacement, the improvement made
Deng should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of single-phase grounded malfunction in grounded system of low current line selection apparatus characterized by comprising
Intelligent controller, capacitor, resistor, fling-cut switch, data acquisition device, voltage transformer and multiple Current Mutual Inductances
Device；
The voltage transformer is used to acquire the three-phase voltage signal of bus, the data acquisition device and the voltage transformer
Connection, by the information collection of voltage transformer into data acquisition device；It is more that the multiple current transformer is respectively used to acquisition
The current signal of item route to be measured；The data acquisition device is separately connected with the multiple current transformer, by multiple electric currents
The information collection of mutual inductor is into data acquisition device；The capacitor and the capacitor in parallel；The intelligent controller energy
The switching device is enough controlled, the capacitor and the resistor are put into respectively in neutral ground branch；The intelligence
It is connected between controller and the data acquisition device by tie line.
2. single-phase grounded malfunction in grounded system of low current line selection apparatus according to claim 1, which is characterized in that the throwing
Cut that close include the silicon-controlled of two parallel connections and Opposite direction connection, it is described silicon-controlled to be formed with the capacitor and the resistor
Parallel branch branch in series is parallel to the neutral ground branch road.
3. single-phase grounded malfunction in grounded system of low current line selection apparatus according to claim 1, which is characterized in that the intelligence
Can control device includes:
Signal receiving unit, for receiving the three-phase voltage signal and current signal of the data acquisition device acquisition；
Signal processing unit, for handling three-phase voltage signal, the multiple current signals that the signal receiving unit receives, point
The phase changing capacity and amplitude variable quantity of the zero-sequence current of a plurality of route to be measured are analysed, phase changing capacity and amplitude variation are screened
Amount is maximum route；
Control unit selects the switching moment, adjusts the preset duration of switching for the processing result of receipt signal processing unit,
And Continuity signal is exported to the switching device.
4. a kind of single-phase ground fault line selecting method of small-electric current grounding system characterized by comprising
Judge to determine small current neutral grounding system in the three-phase voltage signal for the bus that intelligent controller is acquired according to voltage transformer
After singlephase earth fault occurs, fling-cut switch by the capacitor with constant capacitance and the resistor with fixed resistance value,
Neutral ground branch road preset duration is put into respectively；
Multiple current transformers acquire current signal of a plurality of route to be measured in the preset duration respectively, and by the electric current
Signal is transferred to the intelligent controller by data acquisition device；
Intelligent controller analyzes the phase changing capacity amplitude of the zero-sequence current of a plurality of route to be measured according to the current signal respectively
Variable quantity；
The phase changing capacity amplitude variable quantity of the zero-sequence current of the more a plurality of route to be measured of intelligent controller, filters out phase change
Amount and amplitude variable quantity are maximum route, then are faulty line.
5. single-phase ground fault line selecting method of small-electric current grounding system according to claim 4, which is characterized in that the throwing
It cuts and closes the capacitor with constant capacitance and the resistor with fixed resistance value, put into neutral ground branch respectively
Upper preset duration, comprising:
The fling-cut switch repeatedly puts into the capacitor with constant capacitance and the resistor with fixed resistance value respectively
The value of neutral ground branch road preset duration, each preset duration is all different.
6. single-phase ground fault line selecting method of small-electric current grounding system according to claim 4, which is characterized in that described pre-
If when it is 20 milliseconds to 100 milliseconds a length of.
7. single-phase ground fault line selecting method of small-electric current grounding system according to claim 4, which is characterized in that described point
The phase changing capacity and amplitude variable quantity of the zero-sequence current of a plurality of route to be measured are not analyzed, comprising:
The zero-sequence current for calculating separately a plurality of route to be measured is analyzed a plurality of further according to the variation of the zero-sequence current in preset duration
The phase change and amplitude of the zero-sequence current of route to be measured change.
8. single-phase ground fault line selecting method of small-electric current grounding system according to claim 4, which is characterized in that the intelligence
The three-phase voltage signal that can control the bus that device is acquired according to voltage transformer judges to determine that small current neutral grounding system generation is single-phase
Ground fault includes:
Signal receiving unit receives the three-phase voltage value of the bus of voltage transformer acquisition；
Signal processing unit handles three-phase voltage value, compares between the sum of three-phase voltage value and preset voltage threshold
Size relation, and comparison result is transmitted to control unit by signal feedback unit；If the sum of three-phase voltage value is greater than default
Voltage threshold, then judge small current neutral grounding system occur singlephase earth fault；
After preset time, if control unit still judges that singlephase earth fault occurs for system, it is determined that small current neutral grounding
Singlephase earth fault occurs for system.
9. single-phase ground fault line selecting method of small-electric current grounding system according to claim 4, which is characterized in that described pre-
If voltage threshold be greater than one times of normal voltage value, less than the normal voltage value of three times.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910507769.5A CN110286297A (en) | 2019-06-12 | 2019-06-12 | A kind of single-phase grounded malfunction in grounded system of low current line selection apparatus and method |
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| CN201910507769.5A CN110286297A (en) | 2019-06-12 | 2019-06-12 | A kind of single-phase grounded malfunction in grounded system of low current line selection apparatus and method |
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| CN111243226A (en) * | 2020-02-24 | 2020-06-05 | 云南电网有限责任公司 | Personal safety assessment method and system under single-phase broken line tower grounding fault |
| CN111257691A (en) * | 2020-02-25 | 2020-06-09 | 杭州柯林电气股份有限公司 | Single-phase high-resistance earth fault detection method and device for distribution network line |
| CN111693890A (en) * | 2020-04-26 | 2020-09-22 | 国网浙江省电力有限公司 | System and method for processing single-phase earth fault of power distribution network |
| CN111766534A (en) * | 2020-06-07 | 2020-10-13 | 中车永济电机有限公司 | Traction converter ground fault detection method and device |
| CN112684288A (en) * | 2020-12-10 | 2021-04-20 | 国网陕西省电力公司西咸新区供电公司 | Method for realizing small-current single-phase grounding line selection by utilizing three-phase fault signal current |
| CN113484665A (en) * | 2021-06-09 | 2021-10-08 | 广西电网有限责任公司河池供电局 | Fault point positioning method in single-phase earth fault |
| CN114089093A (en) * | 2021-10-13 | 2022-02-25 | 国电南瑞科技股份有限公司 | Single-phase earth fault starting judging method, system, storage medium and computing equipment |
| CN114268085A (en) * | 2021-12-06 | 2022-04-01 | 国网四川省电力公司电力科学研究院 | Power distribution network single-phase earth fault arc extinction method based on capacitance bisection switching |
| WO2022099795A1 (en) * | 2020-11-16 | 2022-05-19 | 贵州电网有限责任公司 | Detection method for detecting small-current single-phase ground fault in 10 kv distribution network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111243226A (en) * | 2020-02-24 | 2020-06-05 | 云南电网有限责任公司 | Personal safety assessment method and system under single-phase broken line tower grounding fault |
| CN111257691A (en) * | 2020-02-25 | 2020-06-09 | 杭州柯林电气股份有限公司 | Single-phase high-resistance earth fault detection method and device for distribution network line |
| CN111693890A (en) * | 2020-04-26 | 2020-09-22 | 国网浙江省电力有限公司 | System and method for processing single-phase earth fault of power distribution network |
| CN111766534A (en) * | 2020-06-07 | 2020-10-13 | 中车永济电机有限公司 | Traction converter ground fault detection method and device |
| WO2022099795A1 (en) * | 2020-11-16 | 2022-05-19 | 贵州电网有限责任公司 | Detection method for detecting small-current single-phase ground fault in 10 kv distribution network |
| CN112684288A (en) * | 2020-12-10 | 2021-04-20 | 国网陕西省电力公司西咸新区供电公司 | Method for realizing small-current single-phase grounding line selection by utilizing three-phase fault signal current |
| CN113484665A (en) * | 2021-06-09 | 2021-10-08 | 广西电网有限责任公司河池供电局 | Fault point positioning method in single-phase earth fault |
| CN113484665B (en) * | 2021-06-09 | 2023-03-14 | 广西电网有限责任公司河池供电局 | Fault point positioning method in single-phase earth fault |
| CN114089093A (en) * | 2021-10-13 | 2022-02-25 | 国电南瑞科技股份有限公司 | Single-phase earth fault starting judging method, system, storage medium and computing equipment |
| CN114268085A (en) * | 2021-12-06 | 2022-04-01 | 国网四川省电力公司电力科学研究院 | Power distribution network single-phase earth fault arc extinction method based on capacitance bisection switching |
| CN114268085B (en) * | 2021-12-06 | 2023-09-26 | 国网四川省电力公司电力科学研究院 | Single-phase earth fault arc extinction method for power distribution network based on capacitive dichotomy switching |
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