CN109782108A - A kind of single-phase grounded malfunction in grounded system of low current localization method and device - Google Patents
A kind of single-phase grounded malfunction in grounded system of low current localization method and device Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention provides a kind of single-phase grounded malfunction in grounded system of low current localization method and device, when singlephase earth fault occurs for the small current neutral grounding system, obtains the phase current of monitoring point；The amplitude and phase of phase current component are determined based on the phase current；Singlephase earth fault is positioned based on amplitude and phase, position fixing process is simple, and positioning result high reliablity.Technical solution provided by the invention does not depend on electromagnetic potential sensor and capacitive battery pressure sensor, avoids ferromagnetic resonance phenomenon, will not impact to the safe and stable operation of power distribution network primary side；The detection and positioning of the local signal progress singlephase earth fault as much as possible for relying on the electric field induction device installed at monitoring point and current transformer acquisition, avoid a large amount of information communication, the reliability for effectively promoting detection and positioning.
Description
Technical field
The present invention relates to distribution network technology fields, and in particular to a kind of single-phase grounded malfunction in grounded system of low current positioning side
Method and device.
Background technique
Power distribution network mostly uses small current neutral grounding mode, and singlephase earth fault be wherein the highest failure of occurrence frequency it
One.Since neutral point is not directly grounded, the fault paths impedance value that singlephase earth fault is formed is larger, and the fault signature of initiation is not
Obviously, simultaneously because noise interference and power distribution network operation conditions (such as asymmetry) influence the problems such as, existing low current
Although single-phase grounded malfunction in grounded system detection localization method have passed through long-term extensive research, but reliability be generally applicable in
Property aspect there are still deficiencies.
The detection of singlephase earth fault, usually foundation residual voltage are carried out to small current neutral grounding system in the prior art,
There are when obvious and long-term residual voltage, determine occur forever in small current neutral grounding system in small current neutral grounding system
Long property singlephase earth fault.This mode deposits problem both ways: on the one hand, generally existing three-phase imbalance is existing in power distribution network
As can equally cause residual voltage existing for duration, easily mutually obscure with singlephase earth fault；On the other hand, zero in power distribution network
The acquisition of sequence voltage is mostly electromagnetic potential transformer, and after singlephase earth fault occurs, Yi Yinfa ferromagnetic resonance endangers small electricity
Flow the safety of earthed system.
In the prior art single-phase grounded malfunction in grounded system of low current positioning be generally basede on based on characteristic quantity difference,
Specific method can be divided into 3 classes: signal injection method, steady-state quantity positioning mode and transient positioning mode.Wherein, signal injection method needs attached
Plus signal device, position fixing process are complicated；Characteristic signal is faint in steady-state quantity positioning mode, and positioning result reliability is low；And transient
Transient characteristic based on positioning mode is more several times greater than steady-state value or even tens times, and is not influenced by arc suppression coil, therefore have
Higher application value.However, transient since it is shorter there are the time, captures and signal extraction is difficult, furthermore, it is necessary to different
The comparison of place transient carries out fault location, and height relies on the communication technology, and positioning result reliability is low.
Summary of the invention
In order to overcome the shortcomings of that above-mentioned position fixing process in the prior art is complicated and positioning result is low by property, the present invention is provided
A kind of single-phase grounded malfunction in grounded system of low current localization method and device, when single-phase earthing occurs for the small current neutral grounding system
When failure, the phase current of monitoring point is obtained；The amplitude and phase of phase current component are determined based on the phase current；Based on amplitude and
Phase positions singlephase earth fault, and position fixing process is simple, and positioning result high reliablity.
In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme that:
On the one hand, the present invention provides a kind of single-phase grounded malfunction in grounded system of low current localization method, comprising:
When singlephase earth fault occurs for the small current neutral grounding system, the phase current of monitoring point is obtained；
The amplitude and phase of phase current component are determined based on the phase current；
Singlephase earth fault is positioned based on amplitude and phase.
It is described when singlephase earth fault occurs for the small current neutral grounding system, before the phase current for obtaining monitoring point, packet
It includes:
It is real-time based on the electric field induction device and current transformer installed respectively at monitoring point each on electric distribution network overhead wire
The phase electric field and phase current of monitoring point are obtained, and judges whether small current neutral grounding system occurs single-phase earthing based on the phase electric field
Failure.
It is described to judge whether small current neutral grounding system occurs singlephase earth fault based on the phase electric field, comprising:
If the phase electric field fall of certain phase is more than preset first phase electric field threshold value at monitoring point, and the in addition phase of two-phase
Electric field ascensional range is more than preset second phase electric field threshold value, determines that singlephase earth fault, and phase occur for small current neutral grounding system
Electric field fall is more than the first preset threshold mutually for failure phase.
The amplitude and phase that phase current component is determined based on the phase current, comprising:
Phase current component is determined based on the phase current；
The amplitude and phase of phase current component are determined based on the phase current component.
It is described that phase current component is determined based on the phase current, comprising:
Intercept the phase current waveform that at least two cycles before and after the moment occur for singlephase earth fault；
Cyclophysis and frequency characteristic based on phase current, from the phase current waveform of interception removal power frequency load current point
Amount, obtains phase current component.
It is described that singlephase earth fault is positioned based on amplitude and phase, comprising:
If the phase absolute value of the difference of failure phase phase and non-faulting phase phase is more than preset phase threshold, and failure phase
Amplitude be more than or equal to the sum of the amplitudes of two non-faulting phases, determine that singlephase earth fault occurs for the monitoring point downstream；
If failure phase phase and the phase absolute value of the difference of non-faulting phase phase are no more than preset phase threshold or failure
The amplitude of phase determines that singlephase earth fault does not occur for the monitoring point downstream less than the sum of the amplitude of two non-faulting phases.
It is described singlephase earth fault is positioned based on amplitude and phase after, comprising:
Monitor the duration of the singlephase earth fault；
The type of the singlephase earth fault is judged based on the duration.
The type that the singlephase earth fault is judged based on the duration, comprising:
If the duration is more than preset time threshold and the singlephase earth fault is not eliminated, determine described single-phase
Ground fault is permanent singlephase earth fault；
If the duration is no more than preset time threshold, and the singlephase earth fault occurs primary and disappears automatically
It removes, determines that the singlephase earth fault is transient single-phase earth fault.
If the duration is no more than preset time threshold, and the singlephase earth fault repeatedly occurs to disappear automatically again
It removes, determines the singlephase earth fault for intermittent singlephase earth fault.
After the type for judging the singlephase earth fault based on the duration, comprising:
Position and fault type based on the monitoring point determine the manner of execution locally switched at monitoring point.
It is described that the manner of execution locally switched at monitoring point, packet are determined based on the position of the monitoring point and fault type
It includes:
If the monitoring point downstream occurs singlephase earth fault and when the monitoring point is located on branch line, if single-phase earthing
Failure is permanent singlephase earth fault or intermittent singlephase earth fault, then tripping locally switchs, and the monitoring point is sent
Fault location information is to main website；If singlephase earth fault is transient single-phase earth fault, it is alert that the monitoring point sends risk
Show information to main website；
If singlephase earth fault occurs for the monitoring point downstream, list does not occur for the downstream of monitoring point adjacent with the monitoring point
Phase ground fault, and the monitoring point is located on feeder line backbone, if single-line ground failure be permanent singlephase earth fault or
Intermittent singlephase earth fault, then the local at two monitoring points of tripping switchs, and two monitoring points send abort situation respectively
Information is to main website；If singlephase earth fault is transient single-phase earth fault, two monitoring points send risk warning letter respectively
It ceases to main website.
On the other hand, the present invention also provides a kind of single-phase grounded malfunction in grounded system of low current positioning devices, comprising:
Module is obtained, for when singlephase earth fault occurs for the small current neutral grounding system, obtaining the phase electricity of monitoring point
Stream；
Determining module, for determining the amplitude and phase of phase current component based on the phase current；
Locating module, for being positioned based on amplitude and phase to singlephase earth fault.
Described device further includes first judgment module, and the first judgment module is specifically used for:
It is real-time based on the electric field induction device and current transformer installed respectively at monitoring point each on electric distribution network overhead wire
The phase electric field and phase current of monitoring point are obtained, and judges whether small current neutral grounding system occurs single-phase earthing based on the phase electric field
Failure.
First judging unit is specifically used for:
If the phase electric field fall of certain phase is more than preset first phase electric field threshold value at monitoring point, and the in addition phase of two-phase
Electric field ascensional range is more than preset second phase electric field threshold value, determines that singlephase earth fault, and phase occur for small current neutral grounding system
Electric field fall is more than the first preset threshold mutually for failure phase.
The determining module includes:
First determination unit, for determining phase current component based on the phase current；
Second determination unit, for determining the amplitude and phase of phase current component based on the phase current component.
First determination unit is specifically used for:
Intercept the phase current waveform that at least two cycles before and after the moment occur for singlephase earth fault；
Cyclophysis and frequency characteristic based on phase current, from the phase current waveform of interception removal power frequency load current point
Amount, obtains phase current component.
The locating module is specifically used for:
If the phase absolute value of the difference of failure phase phase and non-faulting phase phase is more than preset phase threshold, and failure phase
Amplitude be more than or equal to the sum of the amplitudes of two non-faulting phases, determine that singlephase earth fault occurs for the monitoring point downstream；
If failure phase phase and the phase absolute value of the difference of non-faulting phase phase are no more than preset phase threshold or failure
The amplitude of phase determines that singlephase earth fault does not occur for the monitoring point downstream less than the sum of the amplitude of two non-faulting phases.
Described device further includes the second judgment module, and second judgment module includes:
Monitoring unit, for monitoring the duration of the singlephase earth fault；
Second judgment unit, for judging the type of the singlephase earth fault based on the duration.
The second judgment unit is specifically used for:
If the duration is more than preset time threshold and the singlephase earth fault is not eliminated, determine described single-phase
Ground fault is permanent singlephase earth fault；
If the duration is no more than preset time threshold, and the singlephase earth fault occurs primary and disappears automatically
It removes, determines that the singlephase earth fault is transient single-phase earth fault.
If the duration is no more than preset time threshold, and the singlephase earth fault repeatedly occurs to disappear automatically again
It removes, determines the singlephase earth fault for intermittent singlephase earth fault.
Described device further includes execution module, and the execution module is specifically used for:
Position and fault type based on the monitoring point determine the manner of execution locally switched at monitoring point.
The execution module is specifically used for:
If the monitoring point downstream occurs singlephase earth fault and when the monitoring point is located on branch line, if single-phase earthing
Failure is permanent singlephase earth fault or intermittent singlephase earth fault, then tripping locally switchs, and the monitoring point is sent
Fault location information is to main website；If singlephase earth fault is transient single-phase earth fault, it is alert that the monitoring point sends risk
Show information to main website；
If singlephase earth fault occurs for the monitoring point downstream, list does not occur for the downstream of monitoring point adjacent with the monitoring point
Phase ground fault, and the monitoring point is located on feeder line backbone, if single-line ground failure be permanent singlephase earth fault or
Intermittent singlephase earth fault, then the local at two monitoring points of tripping switchs, and two monitoring points send abort situation respectively
Information is to main website；If singlephase earth fault is transient single-phase earth fault, two monitoring points send risk warning letter respectively
It ceases to main website.
Compared with the immediate prior art, technical solution provided by the invention is had the advantages that
In single-phase grounded malfunction in grounded system of low current localization method provided by the invention, when the small current neutral grounding system
When singlephase earth fault occurs, the phase current of monitoring point is obtained；The amplitude and phase of phase current component are determined based on the phase current
Position；Singlephase earth fault is positioned based on amplitude and phase, position fixing process is simple, and positioning result high reliablity；
Technical solution provided by the invention is based not only on the singlephase earth fault that small current neutral grounding system occurs for phase electric field
It is detected, and singlephase earth fault is positioned by phase current, while further defining broken down fault type,
And provide the manner of execution locally switched at monitoring point；
Technical solution provided by the invention does not depend on electromagnetic potential sensor and capacitive battery pressure sensor, avoids iron
Magnetic resonance phenomenon will not impact the safe and stable operation of power distribution network primary side；
Technical solution provided by the invention is as much as possible to rely on the electric field induction device and Current Mutual Inductance installed at monitoring point
The local signal of device acquisition carries out the detection and positioning of singlephase earth fault, avoids a large amount of information communication, effectively promotes inspection
The reliability surveyed and positioned；
Technical solution provided by the invention rationally utilizes phase electric field and phase current, and the fault signature of use is prominent obvious, real
Accurate, reliable, the quick detection and positioning of singlephase earth fault are showed.
Detailed description of the invention
Fig. 1 is small current single-phase grounded malfunction in grounded system localization method flow chart of the present invention；
Fig. 2 is that singlephase earth fault schematic diagram occurs for small current earthed system of the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Embodiment 1
The embodiment of the present invention 1 provides a kind of single-phase grounded malfunction in grounded system of low current localization method, specific flow chart
As shown in Figure 1, detailed process is as follows:
S101: when singlephase earth fault occurs for small current neutral grounding system, the phase current of monitoring point is obtained；
S102: the amplitude and phase of phase current component are determined based on phase current；
S103: singlephase earth fault is positioned based on amplitude and phase.
Above-mentioned S101 when singlephase earth fault occurs for small current neutral grounding system, before the phase current for obtaining monitoring point,
Carry out phase-to-ground fault detection, comprising:
It is real-time based on the electric field induction device and current transformer installed respectively at monitoring point each on electric distribution network overhead wire
The phase electric field and phase current of monitoring point are obtained, and judges whether small current neutral grounding system occurs single-phase earthing event based on phase electric field
Barrier.
Singlephase earth fault schematic diagram occurs for small current neutral grounding system as shown in Fig. 2, in Fig. 2, and F is abort situation, monitoring
The equipping rules of point are as follows: 1) one (at M1, M4 of such as Fig. 2) is configured at outlet switch；2) extend with route, at each block switch
A monitoring point (at M2, M3, M5 and M6 of such as Fig. 2) is configured, the density of configuration determines the accuracy of fault diagnosis；
Judge whether small current neutral grounding system occurs singlephase earth fault, detailed process based on phase electric field are as follows:
If at monitoring point the phase electric field fall of certain phase be more than preset first phase electric field threshold value (such as certain phase phase electricity
Fall is more than that 50%), and in addition the phase electric field ascensional range of two-phase is more than that preset second phase electric field threshold value is (such as another
The phase electric field ascensional range of outer two-phase is more than 50%), to determine that singlephase earth fault occurs for small current neutral grounding system, and under phase electric field
Range of decrease degree is more than the first preset threshold mutually for failure phase, and in addition the phase electric field ascensional range of two-phase is more than preset two phase electricity
Field threshold value is mutually non-faulting phase.
In above-mentioned S102, the amplitude and phase of phase current component are determined based on phase current, comprising:
Phase current component is determined based on phase current；
The amplitude and phase of phase current component are determined based on phase current component, detailed process is as follows:
It intercepts singlephase earth fault and moment at least two cycles of front and back occurs (as front and back intercepts three cycles, i.e. 3*
0.02s=0.06s time span) phase current waveform；
Cyclophysis and frequency characteristic based on phase current remove power frequency load current component from the phase current waveform of interception
(such as three collected numerical value in each collection point of cycle after the moment occur for failure, synchronize and subtract first three week at failure generation moment
Wave corresponds to the collected numerical value in collection point, or filters out power frequency current signal using bandpass filter), obtain phase current component.
In above-mentioned S103, singlephase earth fault is positioned based on amplitude and phase, is specifically divided into following 2 kinds of situations:
If the phase absolute value of the difference of failure phase phase and non-faulting phase phase is more than preset phase threshold, and failure phase
Amplitude be more than or equal to two non-faulting phases the sum of amplitude, determine monitoring point downstream occur singlephase earth fault；
If failure phase phase and the phase absolute value of the difference of non-faulting phase phase are no more than preset phase threshold or failure
The amplitude of phase determines that singlephase earth fault does not occur for monitoring point downstream less than the sum of the amplitude of two non-faulting phases.
After being positioned based on amplitude and phase to singlephase earth fault of above-mentioned S103, comprising:
Monitor the duration of singlephase earth fault；
The type that singlephase earth fault is judged based on the duration is specifically divided into following 3 kinds of situations:
If the duration is more than preset time threshold and singlephase earth fault is not eliminated, determine that singlephase earth fault is forever
Long property singlephase earth fault；
If the duration is no more than preset time threshold, and primary and automatic elimination occurs for singlephase earth fault, determines
Singlephase earth fault is transient single-phase earth fault.
If the duration is no more than preset time threshold, and automatic elimination repeatedly occurs again for singlephase earth fault, determines
Singlephase earth fault is intermittent singlephase earth fault.
After the above-mentioned type for judging singlephase earth fault based on the duration, position and fault type based on monitoring point
Determine the manner of execution locally switched at monitoring point.
Position and fault type based on monitoring point determine local switch (block switch or outlet switch) at monitoring point
Manner of execution, specific process are as follows:
If singlephase earth fault and monitoring point occur for monitoring point downstream when being located on branch line, if singlephase earth fault is forever
Long property singlephase earth fault or intermittent singlephase earth fault, then tripping locally switchs, and monitoring point sends fault location information
To main website；If singlephase earth fault is transient single-phase earth fault, monitoring point sends risk information warning to main website；
If singlephase earth fault occurs for monitoring point downstream, single-phase earthing event does not occur for the downstream of monitoring point adjacent with monitoring point
Barrier (i.e. singlephase earth fault occur in certain monitoring point and positioned at the monitoring point downstream and the monitoring point adjacent with the monitoring point it
Between), and monitoring point is located on feeder line backbone, if single-line ground failure is permanent singlephase earth fault or intermittent single-phase connects
Earth fault, then the local at two monitoring points of tripping switchs, and two monitoring points send fault location information to main website respectively；If
Singlephase earth fault is transient single-phase earth fault, then two monitoring points send risk information warning to main website respectively.
Embodiment 2
Based on the same inventive concept, it is fixed also to provide a kind of single-phase grounded malfunction in grounded system of low current for the embodiment of the present invention 2
Position device, including module, determining module and locating module are obtained, the function of above-mentioned several modules is described in detail below:
Module is obtained, for obtaining the phase current of monitoring point when singlephase earth fault occurs for small current neutral grounding system；
Determining module, for determining the amplitude and phase of phase current component based on phase current；
Locating module, for being positioned based on amplitude and phase to singlephase earth fault.
The device that the embodiment of the present invention 2 provides further includes first judgment module, and first judgment module is specifically used for:
It is real-time based on the electric field induction device and current transformer installed respectively at monitoring point each on electric distribution network overhead wire
The phase electric field and phase current of monitoring point are obtained, and judges whether small current neutral grounding system occurs single-phase earthing based on the phase electric field
Failure.
Above-mentioned first judging unit is specifically used for:
If the phase electric field fall of certain phase is more than preset first phase electric field threshold value at monitoring point, and the in addition phase of two-phase
Electric field ascensional range is more than preset second phase electric field threshold value, determines that singlephase earth fault, and phase occur for small current neutral grounding system
Electric field fall is more than the first preset threshold mutually for failure phase.
Above-mentioned determining module includes:
First determination unit, for determining phase current component based on phase current；
Second determination unit, for determining the amplitude and phase of phase current component based on phase current component.
First determination unit is specifically used for:
Intercept the phase current waveform that at least two cycles before and after the moment occur for singlephase earth fault；
Cyclophysis and frequency characteristic based on phase current, from the phase current waveform of interception removal power frequency load current point
Amount, obtains phase current component.
Above-mentioned locating module is specifically used for:
If the phase absolute value of the difference of failure phase phase and non-faulting phase phase is more than preset phase threshold, and failure phase
Amplitude be more than or equal to two non-faulting phases the sum of amplitude, determine monitoring point downstream occur singlephase earth fault；
If failure phase phase and the phase absolute value of the difference of non-faulting phase phase are no more than preset phase threshold or failure
The amplitude of phase determines that singlephase earth fault does not occur for monitoring point downstream less than the sum of the amplitude of two non-faulting phases.
The device that the embodiment of the present invention 2 provides further includes the second judgment module, and the second judgment module includes:
Monitoring unit, for monitoring the duration of singlephase earth fault；
Second judgment unit, for judging the type of singlephase earth fault based on the duration.
Second judgment unit is specifically used for:
If the duration is more than preset time threshold and singlephase earth fault is not eliminated, determine that singlephase earth fault is forever
Long property singlephase earth fault；
If the duration is no more than preset time threshold, and primary and automatic elimination occurs for singlephase earth fault, determines
Singlephase earth fault is transient single-phase earth fault.
If the duration is no more than preset time threshold, and automatic elimination repeatedly occurs again for singlephase earth fault, determines
Singlephase earth fault is intermittent singlephase earth fault.
The device that the embodiment of the present invention 2 provides further includes execution module, position and failure of the execution module based on monitoring point
Type determines the manner of execution locally switched at monitoring point, and detailed process is as follows:
If singlephase earth fault and monitoring point occur for monitoring point downstream when being located on branch line, if singlephase earth fault is forever
Long property singlephase earth fault or intermittent singlephase earth fault, then tripping locally switchs, and monitoring point sends fault location information
To main website；If singlephase earth fault is transient single-phase earth fault, monitoring point sends risk information warning to main website；
If singlephase earth fault occurs for monitoring point downstream, single-phase earthing event does not occur for the downstream of monitoring point adjacent with monitoring point
Barrier, and monitoring point is located on feeder line backbone, if single-line ground failure is permanent singlephase earth fault or intermittence is single-phase connects
Earth fault, then the local at two monitoring points of tripping switchs, and two monitoring points send fault location information to main website respectively；If
Singlephase earth fault is transient single-phase earth fault, then two monitoring points send risk information warning to main website respectively.
For convenience of description, each section of apparatus described above is divided into various modules with function or unit describes respectively.
Certainly, each module or the function of unit can be realized in same or multiple softwares or hardware when implementing the application.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field can still modify to a specific embodiment of the invention referring to above-described embodiment or
Equivalent replacement, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent replacement
Within bright claims.
Claims (20)
1. a kind of single-phase grounded malfunction in grounded system of low current localization method characterized by comprising
When singlephase earth fault occurs for the small current neutral grounding system, the phase current of monitoring point is obtained；
The amplitude and phase of phase current component are determined based on the phase current；
Singlephase earth fault is positioned based on amplitude and phase.
2. single-phase grounded malfunction in grounded system of low current localization method according to claim 1, which is characterized in that described to work as
When singlephase earth fault occurs for the small current neutral grounding system, before the phase current for obtaining monitoring point, comprising:
It is obtained in real time based on the electric field induction device and current transformer installed respectively at monitoring point each on electric distribution network overhead wire
The phase electric field and phase current of monitoring point, and judge whether small current neutral grounding system occurs single-phase earthing event based on the phase electric field
Barrier.
3. single-phase grounded malfunction in grounded system of low current localization method according to claim 2, which is characterized in that the base
Judge whether small current neutral grounding system occurs singlephase earth fault in the phase electric field, comprising:
If the phase electric field fall of certain phase is more than preset first phase electric field threshold value at monitoring point, and the in addition phase electric field of two-phase
Ascensional range is more than preset second phase electric field threshold value, determines that singlephase earth fault, and phase electric field occur for small current neutral grounding system
Fall is more than the first preset threshold mutually for failure phase.
4. single-phase grounded malfunction in grounded system of low current localization method according to claim 2, which is characterized in that the base
The amplitude and phase of phase current component are determined in the phase current, comprising:
Phase current component is determined based on the phase current；
The amplitude and phase of phase current component are determined based on the phase current component.
5. single-phase grounded malfunction in grounded system of low current localization method according to claim 4, which is characterized in that the base
Phase current component is determined in the phase current, comprising:
Intercept the phase current waveform that at least two cycles before and after the moment occur for singlephase earth fault；
Cyclophysis and frequency characteristic based on phase current remove power frequency load current component from the phase current waveform of interception, obtain
To phase current component.
6. single-phase grounded malfunction in grounded system of low current localization method according to claim 1, which is characterized in that the base
Singlephase earth fault is positioned in amplitude and phase, comprising:
If the phase absolute value of the difference of failure phase phase and non-faulting phase phase is more than preset phase threshold, and the width of failure phase
Value is more than or equal to the sum of the amplitude of two non-faulting phases, determines that singlephase earth fault occurs for the monitoring point downstream；
If the phase absolute value of the difference of failure phase phase and non-faulting phase phase is no more than preset phase threshold or failure phase
Amplitude determines that singlephase earth fault does not occur for the monitoring point downstream less than the sum of the amplitude of two non-faulting phases.
7. single-phase grounded malfunction in grounded system of low current localization method according to claim 6, which is characterized in that the base
After amplitude and phase position singlephase earth fault, comprising:
Monitor the duration of the singlephase earth fault；
The type of the singlephase earth fault is judged based on the duration.
8. single-phase grounded malfunction in grounded system of low current localization method according to claim 7, which is characterized in that the base
The type of the singlephase earth fault is judged in the duration, comprising:
If the duration is more than preset time threshold and the singlephase earth fault is not eliminated, the single-phase earthing is determined
Failure is permanent singlephase earth fault；
If the duration is no more than preset time threshold, and primary and automatic elimination occurs for the singlephase earth fault,
Determine that the singlephase earth fault is transient single-phase earth fault.
If the duration is no more than preset time threshold, and automatic elimination repeatedly occurs again for the singlephase earth fault,
Determine the singlephase earth fault for intermittent singlephase earth fault.
9. single-phase grounded malfunction in grounded system of low current localization method according to claim 8, which is characterized in that the base
After the type that the duration judges the singlephase earth fault, comprising:
Position and fault type based on the monitoring point determine the manner of execution locally switched at monitoring point.
10. single-phase grounded malfunction in grounded system of low current localization method according to claim 9, which is characterized in that described
Position and fault type based on the monitoring point determine the manner of execution locally switched at monitoring point, comprising:
If the monitoring point downstream occurs singlephase earth fault and when the monitoring point is located on branch line, if singlephase earth fault
For permanent singlephase earth fault or intermittent singlephase earth fault, then tripping locally switchs, and the monitoring point sends failure
Location information is to main website；If singlephase earth fault is transient single-phase earth fault, the monitoring point sends risk warning letter
It ceases to main website；
If singlephase earth fault occurs for the monitoring point downstream, single-phase connect does not occur for the downstream of monitoring point adjacent with the monitoring point
Earth fault, and the monitoring point is located on feeder line backbone, if single-line ground failure is permanent singlephase earth fault or interval
Property singlephase earth fault, then the local switch at two monitoring points of tripping, and two monitoring points send fault location information respectively
To main website；If singlephase earth fault be transient single-phase earth fault, two monitoring points send respectively risk information warning to
Main website.
11. a kind of single-phase grounded malfunction in grounded system of low current positioning device characterized by comprising
Module is obtained, for obtaining the phase current of monitoring point when singlephase earth fault occurs for the small current neutral grounding system；
Determining module, for determining the amplitude and phase of phase current component based on the phase current；
Locating module, for being positioned based on amplitude and phase to singlephase earth fault.
12. single-phase grounded malfunction in grounded system of low current positioning device according to claim 11, which is characterized in that described
Device further includes first judgment module, and the first judgment module is specifically used for:
It is obtained in real time based on the electric field induction device and current transformer installed respectively at monitoring point each on electric distribution network overhead wire
The phase electric field and phase current of monitoring point, and judge whether small current neutral grounding system occurs single-phase earthing event based on the phase electric field
Barrier.
13. single-phase grounded malfunction in grounded system of low current positioning device according to claim 12, which is characterized in that described
First judging unit is specifically used for:
If the phase electric field fall of certain phase is more than preset first phase electric field threshold value at monitoring point, and the in addition phase electric field of two-phase
Ascensional range is more than preset second phase electric field threshold value, determines that singlephase earth fault, and phase electric field occur for small current neutral grounding system
Fall is more than the first preset threshold mutually for failure phase.
14. single-phase grounded malfunction in grounded system of low current positioning device according to claim 12, which is characterized in that described
Determining module includes:
First determination unit, for determining phase current component based on the phase current；
Second determination unit, for determining the amplitude and phase of phase current component based on the phase current component.
15. single-phase grounded malfunction in grounded system of low current positioning device according to claim 14, which is characterized in that described
First determination unit is specifically used for:
Intercept the phase current waveform that at least two cycles before and after the moment occur for singlephase earth fault；
Cyclophysis and frequency characteristic based on phase current remove power frequency load current component from the phase current waveform of interception, obtain
To phase current component.
16. single-phase grounded malfunction in grounded system of low current positioning device according to claim 11, which is characterized in that described
Locating module is specifically used for:
If the phase absolute value of the difference of failure phase phase and non-faulting phase phase is more than preset phase threshold, and the width of failure phase
Value is more than or equal to the sum of the amplitude of two non-faulting phases, determines that singlephase earth fault occurs for the monitoring point downstream；
If the phase absolute value of the difference of failure phase phase and non-faulting phase phase is no more than preset phase threshold or failure phase
Amplitude determines that singlephase earth fault does not occur for the monitoring point downstream less than the sum of the amplitude of two non-faulting phases.
17. single-phase grounded malfunction in grounded system of low current positioning device according to claim 16, which is characterized in that described
Device further includes the second judgment module, and second judgment module includes:
Monitoring unit, for monitoring the duration of the singlephase earth fault；
Second judgment unit, for judging the type of the singlephase earth fault based on the duration.
18. single-phase grounded malfunction in grounded system of low current positioning device according to claim 17, which is characterized in that described
Second judgment unit is specifically used for:
If the duration is more than preset time threshold and the singlephase earth fault is not eliminated, the single-phase earthing is determined
Failure is permanent singlephase earth fault；
If the duration is no more than preset time threshold, and primary and automatic elimination occurs for the singlephase earth fault,
Determine that the singlephase earth fault is transient single-phase earth fault.
If the duration is no more than preset time threshold, and automatic elimination repeatedly occurs again for the singlephase earth fault,
Determine the singlephase earth fault for intermittent singlephase earth fault.
19. single-phase grounded malfunction in grounded system of low current positioning device according to claim 18, which is characterized in that described
Device further includes execution module, and the execution module is specifically used for:
Position and fault type based on the monitoring point determine the manner of execution locally switched at monitoring point.
20. single-phase grounded malfunction in grounded system of low current positioning device according to claim 19, which is characterized in that described
Execution module is specifically used for:
If the monitoring point downstream occurs singlephase earth fault and when the monitoring point is located on branch line, if singlephase earth fault
For permanent singlephase earth fault or intermittent singlephase earth fault, then tripping locally switchs, and the monitoring point sends failure
Location information is to main website；If singlephase earth fault is transient single-phase earth fault, the monitoring point sends risk warning letter
It ceases to main website；
If singlephase earth fault occurs for the monitoring point downstream, single-phase connect does not occur for the downstream of monitoring point adjacent with the monitoring point
Earth fault, and the monitoring point is located on feeder line backbone, if single-line ground failure is permanent singlephase earth fault or interval
Property singlephase earth fault, then the local switch at two monitoring points of tripping, and two monitoring points send fault location information respectively
To main website；If singlephase earth fault be transient single-phase earth fault, two monitoring points send respectively risk information warning to
Main website.
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