CN109633373A - Failure accurate positioning method and device in a kind of power distribution network - Google Patents
Failure accurate positioning method and device in a kind of power distribution network Download PDFInfo
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- CN109633373A CN109633373A CN201811559227.4A CN201811559227A CN109633373A CN 109633373 A CN109633373 A CN 109633373A CN 201811559227 A CN201811559227 A CN 201811559227A CN 109633373 A CN109633373 A CN 109633373A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Emergency Protection Circuit Devices (AREA)
- Locating Faults (AREA)
Abstract
The present invention relates to failure accurate positioning method and devices in a kind of power distribution network, comprising: obtains the monitoring data at fault section both ends on feeder line；Determine current failure away from fault section head end distance according to the monitoring data at fault section both ends.Technical solution provided by the invention realizes the accurate positioning of failure using the electrical quantity recorder data in power distribution network, helps to improve troubleshooting speed, shortens customer outage hours.
Description
Technical field
The present invention relates to electric power system and its automation fields, and in particular to failure accurate positioning method in a kind of power distribution network
And device.
Background technique
Power distribution network can cause to directly affect close to user side, operational reliability to user power utilization, and event occurs in power distribution network
It after barrier, needs to search abort situation as accurately as possible, quickly to carry out respective handling, shortens customer outage hours.It is existing
That is, after the failure occurs distribution network failure location technology, can determine fault section in terms of concentrating on failure selections, and right
Less in the accurate positioning research of failure on fault section, accuracy is not high.
Currently, with the distribution network automated and level of IT application continuous improvement, information abundant is able to real-time or quasi- reality
When be transmitted to control centre, this make comprehensive utilization acquire various information carry out distribution network failure be accurately positioned become can
Energy.Especially intelligent monitoring terminal is universal, so that each collection point recordings such as collected electric current, voltage in real time in power distribution network
Information may be implemented to be locally stored, and real-time recorder data can be uploaded to control centre according to the demand of main control platform, power supply
Analysis of Isolated Net Running judgement uses.
Summary of the invention
In order to solve the problems, such as in power distribution network that failure is accurately positioned, the present invention provides failure in a kind of power distribution network and is accurately positioned
Method and device.By this method, the monitoring data at fault section both ends on feeder line are obtained, and according to fault section both ends
Monitoring data determine current failure away from fault section head end distance, and this method effectively realizes the accurate positioning of failure, is conducive to
Troubleshooting speed is improved, customer outage hours are shortened.
Failure accurate positioning method in a kind of power distribution network provided by the invention, it is improved in that including:
Obtain the monitoring data at fault section both ends on feeder line；
Determine current failure away from fault section head end distance according to the monitoring data at fault section both ends.
Preferably, when the fault section is feeder line outlet the first section of head end, the monitoring at the fault section both ends
Data are the real-time voltage virtual value U of feeder line section head end monitoring point monitoring when current failure occurs0', feeder line segment ends prison
The real-time voltage virtual value U of measuring point monitoring1' and monitoring real-time short circuit current virtual value If'。
Further, the monitoring data according to fault section both ends determine current failure away from fault section head end away from
From, comprising:
According to the monitoring data of historical failure, the scale factor k of historical failure i is calculated as followsi:
In above formula, Ui0The voltage effective value of feeder line section head end monitoring point, U when occurring for historical failure ii1For history event
Hinder the voltage effective value of feeder line segment ends monitoring point when i occurs, IfiShort circuit current virtual value when occurring for historical failure i, li
The distance of positional distance fault section head end monitoring point occurs for historical failure i, i ∈ [1, N], N are the quantity of historical failure；
According to N number of historical failure monitoring data of collection, the average proportions factor k of historical failure is obtaineda；
The current failure is calculated as follows away from fault section head end distance Lf:
Preferably, when the fault section is the later section of feeder line outlet head end the second or the second, in the steps below
Acquire the monitoring data at the fault section both ends:
A. the fault section both ends are enabled and fault feeder head end is monitoring point, acquire the monitoring point in preset period of time
The midpoint that point is preset period of time occurs for voltage and current recorder data, the failure；
If b. the voltage and current recorder data of the monitoring point saves the voltage and current with the markers after clock synchronization
Recorder data, if the voltage and current recorder data of the monitoring point is sent out with the markers after non-clock synchronization with the monitoring point
Electricity before the raw curent change moment on the basis of nearest voltage over zero markers to time point, to the monitoring point acquired in preset period of time
Pressure and current recording data re-start markers mark；
Wherein, the markers of j-th of voltage and current recorder data of the monitoring point acquired after the benchmark is to time point
For tj=t0+ j × Δ t, j-th of voltage and current recorder data of the monitoring point acquired before the benchmark is to time point when
It is designated as tj=t0- j × Δ t, t in above formula0Nearest voltage over zero markers before the curent change moment occurs for the monitoring point,
Δ t is the time interval for acquiring data.
Further, the monitoring data according to fault section both ends determine current failure away from fault section head end away from
From, comprising:
Determine current failure away from fault section head end distance L as the following formulaf:
In above formula, L is the distance between fault section head end monitoring point and fault feeder head end monitoring point, u0tnFor failure
N-th of voltage effective value of feeder line head end monitoring point monitoring, u1tnN-th of the voltage for the monitoring of fault section head end monitoring point has
Valid value, u2tnFor n-th of voltage effective value of fault section end monitoring point monitoring, M is that the voltage that acquires is effective in preset period of time
Value sum.
Failure accurate positioning device in a kind of power distribution network, it is improved in that including:
Module is obtained, for obtaining the monitoring data at fault section both ends on feeder line；
Determining module, for according to the monitoring data at fault section both ends determine current failure away from fault section head end away from
From.
Preferably, the acquisition module, comprising:
When the fault section is feeder line outlet the first section of head end, for obtaining feeder line section when current failure occurs
The real-time voltage virtual value U of head end monitoring point monitoring0', the real-time voltage virtual value U of feeder line segment ends monitoring point monitoring1' and
The real-time short circuit current virtual value I of monitoringf'；
When the fault section is the later section of feeder line outlet head end the second or the second, in the steps below described in acquisition
The monitoring data at fault section both ends:
A. the fault section both ends are enabled and fault feeder head end is monitoring point, acquire the monitoring point in preset period of time
The midpoint that point is preset period of time occurs for voltage and current recorder data, the failure；
If b. the voltage and current recorder data of the monitoring point saves the voltage and current with the markers after clock synchronization
Recorder data, if the voltage and current recorder data of the monitoring point is sent out with the markers after non-clock synchronization with the monitoring point
Electricity before the raw curent change moment on the basis of nearest voltage over zero markers to time point, to the monitoring point acquired in preset period of time
Pressure and current recording data re-start markers mark；
Wherein, the markers of j-th of voltage and current recorder data of the monitoring point acquired after the benchmark is to time point
For tj=t0+ j × Δ t, j-th of voltage and current recorder data of the monitoring point acquired before the benchmark is to time point when
It is designated as tj=t0- j × Δ t, t in above formula0Nearest voltage over zero markers before the curent change moment occurs for the monitoring point,
Δ t is the time interval for acquiring data.
Preferably, the determining module, comprising:
When the fault section is feeder line outlet the first section of head end, according to the monitoring data of historical failure, as the following formula
Calculate the scale factor k of historical failure ii:
In above formula, Ui0The voltage effective value of feeder line section head end monitoring point, U when occurring for historical failure ii1For history event
Hinder the voltage effective value of feeder line segment ends monitoring point when i occurs, IfiShort circuit current virtual value when occurring for historical failure i, li
The distance of positional distance fault section head end monitoring point occurs for historical failure i, i ∈ [1, N], N are the quantity of historical failure；
According to N number of historical failure monitoring data of collection, the average proportions factor k of historical failure is obtaineda；
The current failure is calculated as follows away from fault section head end distance Lf:
When the fault section is the later section of feeder line outlet head end the second or the second, current failure is determined as the following formula
Away from fault section head end distance Lf:
In above formula, L is the distance between fault section head end monitoring point and fault feeder head end monitoring point, u0tnFor failure
N-th of voltage effective value of feeder line head end monitoring point monitoring, u1tnN-th of the voltage for the monitoring of fault section head end monitoring point has
Valid value, u2tnFor n-th of voltage effective value of fault section end monitoring point monitoring, M is that the voltage that acquires is effective in preset period of time
Value sum.
Compared with the latest prior art, technical solution provided by the invention has following excellent effect:
The present invention provides failure accurate positioning method and device in a kind of power distribution network, the mistake monitored according to each monitoring point
Stream situation or the action situation of protection determine fault section, according to voltage wave-record chart collected at monitoring point, realize failure
Accurate positioning, improve troubleshooting speed, shorten customer outage hours.
Detailed description of the invention
Fig. 1 is the flow chart of failure accurate positioning method in power distribution network provided by the invention.
Specific embodiment
It elaborates with reference to the accompanying drawing to a specific embodiment of the invention.
Embodiment one
The embodiment of the present invention provides failure accurate positioning method in a kind of power distribution network, and flow chart is as shown in Figure 1, include following
Step:
Obtain the monitoring data at fault section both ends on feeder line；
Determine current failure away from fault section head end distance according to the monitoring data at fault section both ends.
Specifically, when the fault section is feeder line outlet the first section of head end, the monitoring at the fault section both ends
Data are the real-time voltage virtual value U of feeder line section head end monitoring point monitoring when current failure occurs0', feeder line segment ends prison
The real-time voltage virtual value U of measuring point monitoring1' and monitoring real-time short circuit current virtual value If'。
Further, the monitoring data according to fault section both ends determine current failure away from fault section head end away from
From, comprising:
According to the monitoring data of historical failure, the scale factor k of historical failure i is calculated as followsi:
In above formula, Ui0The voltage effective value of feeder line section head end monitoring point, U when occurring for historical failure ii1For history event
Hinder the voltage effective value of feeder line segment ends monitoring point when i occurs, IfiShort circuit current virtual value when occurring for historical failure i, li
The distance of positional distance fault section head end monitoring point occurs for historical failure i, i ∈ [1, N], N are the quantity of historical failure；
According to N number of historical failure monitoring data of collection, the average proportions factor k of historical failure is obtaineda；
The current failure is calculated as follows away from fault section head end distance Lf:
Specifically, when the fault section is the later section of feeder line outlet head end the second or the second, in the steps below
Acquire the monitoring data at the fault section both ends:
A. the fault section both ends are enabled and fault feeder head end is monitoring point, failure can be extracted and occurred 1 before and after the moment
The voltage and current recorder data of monitoring point in minute includes voltage time series corresponding with current instantaneous value；
If b. the voltage and current recorder data of the monitoring point saves the voltage and current with the markers after clock synchronization
Recorder data, if the voltage and current recorder data of the monitoring point is sent out with the markers after non-clock synchronization with the monitoring point
Electricity before the raw curent change moment on the basis of nearest voltage over zero markers to time point, to the monitoring point acquired in preset period of time
Pressure and current recording data re-start markers mark；
Wherein, the markers of j-th of voltage and current recorder data of the monitoring point acquired after the benchmark is to time point
For tj=t0+ j × Δ t, j-th of voltage and current recorder data of the monitoring point acquired before the benchmark is to time point when
It is designated as tj=t0- j × Δ t, t in above formula0Nearest voltage over zero markers before the curent change moment occurs for the monitoring point,
Δ t is the time interval for acquiring data.
Further, the monitoring data according to fault section both ends determine current failure away from fault section head end away from
From, comprising:
For each voltage time sequence, intercept failure occur after short circuit current after the moment is stablized with protection act it
Preceding a period of time sequence.For failure phase, the absolute value and fault section head end of the difference in voltage at fault section first and last end and
Ratio between the absolute value of the difference in voltage of feeder line head end is approximately equal to the distance and failure of fault point and fault section head end
Ratio between section head end and the distance of feeder line head end.Principle accordingly carries out failure accurate positioning.
Determine current failure away from fault section head end distance L as the following formulaf:
In above formula, L is the distance between fault section head end monitoring point and fault feeder head end monitoring point, u0tnFor failure
N-th of voltage effective value of feeder line head end monitoring point monitoring, u1tnN-th of the voltage for the monitoring of fault section head end monitoring point has
Valid value, u2tnFor n-th of voltage effective value of fault section end monitoring point monitoring, M is that the voltage that acquires is effective in preset period of time
Value sum.
Embodiment two
The embodiment of the present invention also provides failure accurate positioning device in a kind of power distribution network, comprising:
Module is obtained, for obtaining the monitoring data at fault section both ends on feeder line；
Determining module, for according to the monitoring data at fault section both ends determine current failure away from fault section head end away from
From.
Specifically, the acquisition module, comprising:
When the fault section is feeder line outlet the first section of head end, for obtaining feeder line section when current failure occurs
The real-time voltage virtual value U of head end monitoring point monitoring0', the real-time voltage virtual value U of feeder line segment ends monitoring point monitoring1' and
The real-time short circuit current virtual value I of monitoringf'；
When the fault section is the later section of feeder line outlet head end the second or the second, in the steps below described in acquisition
The monitoring data at fault section both ends:
A. the fault section both ends are enabled and fault feeder head end is monitoring point, acquire the monitoring point in preset period of time
The midpoint that point is preset period of time occurs for voltage and current recorder data, the failure；
If b. the voltage and current recorder data of the monitoring point saves the voltage and current with the markers after clock synchronization
Recorder data, if the voltage and current recorder data of the monitoring point is sent out with the markers after non-clock synchronization with the monitoring point
Electricity before the raw curent change moment on the basis of nearest voltage over zero markers to time point, to the monitoring point acquired in preset period of time
Pressure and current recording data re-start markers mark；
Wherein, the markers of j-th of voltage and current recorder data of the monitoring point acquired after the benchmark is to time point
For tj=t0+ j × Δ t, j-th of voltage and current recorder data of the monitoring point acquired before the benchmark is to time point when
It is designated as tj=t0- j × Δ t, t in above formula0Nearest voltage over zero markers before the curent change moment occurs for the monitoring point,
Δ t is the time interval for acquiring data.
Specifically, the determining module, comprising:
When the fault section is feeder line outlet the first section of head end, according to the monitoring data of historical failure, as the following formula
Calculate the scale factor k of historical failure ii:
In above formula, Ui0The voltage effective value of feeder line section head end monitoring point, U when occurring for historical failure ii1For history event
Hinder the voltage effective value of feeder line segment ends monitoring point when i occurs, IfiShort circuit current virtual value when occurring for historical failure i, li
The distance of positional distance fault section head end monitoring point occurs for historical failure i, i ∈ [1, N], N are the quantity of historical failure；
According to N number of historical failure monitoring data of collection, the average proportions factor k of historical failure is obtaineda；
The current failure is calculated as follows away from fault section head end distance Lf:
When the fault section is the later section of feeder line outlet head end the second or the second, current failure is determined as the following formula
Away from fault section head end distance Lf:
In above formula, L is the distance between fault section head end monitoring point and fault feeder head end monitoring point, u0tnFor failure
N-th of voltage effective value of feeder line head end monitoring point monitoring, u1tnN-th of the voltage for the monitoring of fault section head end monitoring point has
Valid value, u2tnFor n-th of voltage effective value of fault section end monitoring point monitoring, M is that the voltage that acquires is effective in preset period of time
Value sum.
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.
The above is only the embodiment of the present invention, are not intended to restrict the invention, all in the spirit and principles in the present invention
Within, any modification, equivalent substitution, improvement and etc. done, be all contained in apply pending scope of the presently claimed invention it
It is interior.
Claims (8)
1. failure accurate positioning method in a kind of power distribution network, which is characterized in that the described method includes:
Obtain the monitoring data at fault section both ends on feeder line；
Determine current failure away from fault section head end distance according to the monitoring data at fault section both ends.
2. failure accurate positioning method in power distribution network as described in claim 1, which is characterized in that when the fault section is feedback
When line outlet the first section of head end, the monitoring data at the fault section both ends are that feeder line section head end is supervised when current failure occurs
The real-time voltage virtual value U of measuring point monitoring0', the real-time voltage virtual value U of feeder line segment ends monitoring point monitoring1' and monitoring
Real-time short circuit current virtual value If'。
3. failure accurate positioning method in power distribution network as claimed in claim 2, which is characterized in that described according to fault section two
The monitoring data at end determine current failure away from fault section head end distance, comprising:
According to the monitoring data of historical failure, the scale factor k of historical failure i is calculated as followsi:
In above formula, Ui0The voltage effective value of feeder line section head end monitoring point, U when occurring for historical failure ii1For historical failure i hair
The voltage effective value of feeder line segment ends monitoring point, I when rawfiShort circuit current virtual value when occurring for historical failure i, liFor history
The distance of positional distance fault section head end monitoring point occurs for failure i, and i ∈ [1, N], N are the quantity of historical failure；
According to N number of historical failure monitoring data of collection, the average proportions factor k of historical failure is obtaineda；
The current failure is calculated as follows away from fault section head end distance Lf:
4. failure accurate positioning method in power distribution network as described in claim 1, which is characterized in that when the fault section is feedback
When the later section of line outlet head end the second or the second, the monitoring data at the fault section both ends are acquired in the steps below:
A. the fault section both ends are enabled and fault feeder head end is monitoring point, acquire the voltage of the monitoring point in preset period of time
With current recording data, the midpoint that point is preset period of time occurs for the failure；
If b. the voltage and current recorder data of the monitoring point saves the voltage and current recording with the markers after clock synchronization
Data, if with the markers after non-clock synchronization, with the monitoring point electricity occurs for the voltage and current recorder data of the monitoring point
To time point on the basis of nearest voltage over zero markers before the rheology moment, voltage to the monitoring point acquired in preset period of time and
Current recording data re-start markers mark；
Wherein, the monitoring point acquired after the benchmark is to time point j-th of voltage and current recorder data when be designated as tj=
t0+ j × Δ t, j-th of voltage and current recorder data of the monitoring point acquired before the benchmark is to time point when be designated as tj
=t0- j × Δ t, t in above formula0For voltage over zero markers nearest before the generation curent change moment of the monitoring point, Δ t is to adopt
Collect the time interval of data.
5. failure accurate positioning method in power distribution network as claimed in claim 4, which is characterized in that described according to fault section two
The monitoring data at end determine current failure away from fault section head end distance, comprising:
Determine current failure away from fault section head end distance L as the following formulaf:
In above formula, L is the distance between fault section head end monitoring point and fault feeder head end monitoring point, u0tnFor fault feeder
N-th of voltage effective value of head end monitoring point monitoring, u1tnFor fault section head end monitoring point monitoring n-th of voltage effective value,
u2tnFor n-th of voltage effective value of fault section end monitoring point monitoring, M is that the voltage effective value that acquires is total in preset period of time
Number.
6. failure accurate positioning device in a kind of power distribution network, which is characterized in that described device includes:
Module is obtained, for obtaining the monitoring data at fault section both ends on feeder line；
Determining module, for determining current failure away from fault section head end distance according to the monitoring data at fault section both ends.
7. failure accurate positioning device in power distribution network as claimed in claim 6, which is characterized in that the acquisition module is used for:
When the fault section is feeder line outlet the first section of head end, for obtaining feeder line section head end when current failure occurs
The real-time voltage virtual value U of monitoring point monitoring0', the real-time voltage virtual value U of feeder line segment ends monitoring point monitoring1' and monitoring
Real-time short circuit current virtual value If'；
When the fault section is the later section of feeder line outlet head end the second or the second, the failure is acquired in the steps below
The monitoring data at section both ends:
A. the fault section both ends are enabled and fault feeder head end is monitoring point, acquire the voltage of the monitoring point in preset period of time
With current recording data, the midpoint that point is preset period of time occurs for the failure；
If b. the voltage and current recorder data of the monitoring point saves the voltage and current recording with the markers after clock synchronization
Data, if with the markers after non-clock synchronization, with the monitoring point electricity occurs for the voltage and current recorder data of the monitoring point
To time point on the basis of nearest voltage over zero markers before the rheology moment, voltage to the monitoring point acquired in preset period of time and
Current recording data re-start markers mark；
Wherein, the monitoring point acquired after the benchmark is to time point j-th of voltage and current recorder data when be designated as tj=
t0+ j × Δ t, j-th of voltage and current recorder data of the monitoring point acquired before the benchmark is to time point when be designated as tj
=t0- j × Δ t, t in above formula0For voltage over zero markers nearest before the generation curent change moment of the monitoring point, Δ t is to adopt
Collect the time interval of data.
8. failure accurate positioning device in power distribution network as claimed in claim 6, which is characterized in that the determining module is used for:
When the fault section is feeder line outlet the first section of head end, according to the monitoring data of historical failure, it is calculated as follows
The scale factor k of historical failure ii:
In above formula, Ui0The voltage effective value of feeder line section head end monitoring point, U when occurring for historical failure ii1For historical failure i hair
The voltage effective value of feeder line segment ends monitoring point, I when rawfiShort circuit current virtual value when occurring for historical failure i, liFor history
The distance of positional distance fault section head end monitoring point occurs for failure i, and i ∈ [1, N], N are the quantity of historical failure；
According to N number of historical failure monitoring data of collection, the average proportions factor k of historical failure is obtaineda；
The current failure is calculated as follows away from fault section head end distance Lf:
When the fault section is the later section of feeder line outlet head end the second or the second, determine current failure away from event as the following formula
Hinder section head end distance Lf:
In above formula, L is the distance between fault section head end monitoring point and fault feeder head end monitoring point, u0tnFor fault feeder
N-th of voltage effective value of head end monitoring point monitoring, u1tnFor fault section head end monitoring point monitoring n-th of voltage effective value,
u2tnFor n-th of voltage effective value of fault section end monitoring point monitoring, M is that the voltage effective value that acquires is total in preset period of time
Number.
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