CN110426606A - Based on wide area synchronous distribution net work earthing fault localization method and device - Google Patents

Abstract

The invention discloses a distribution network grounding fault location method and device based on wide-area synchronization, and relates to the technical field of power system fault diagnosis. The method includes the following steps: obtaining the zero-sequence voltage change time of the bus side according to the voltage change of the bus side Obtain the zero-sequence voltage change time at the line end according to the voltage change at the line end; determine the fault location according to the zero-sequence voltage change time at the bus side and the zero-sequence voltage change time at the line end. The technical scheme of the present invention can avoid sensor misoperation and refusal to operate, and improve equipment reliability. At the same time, the voltage waveform of the recorded wave can be transmitted back to the edge agent module on the bus side through the zero-sequence voltage monitoring module at the end of each outgoing line. Realize the precise location of the fault point.

Description

Distribution network ground fault location method and device based on wide area synchronization

technical field

The invention relates to the technical field of power system fault diagnosis, in particular to a wide-area synchronization-based distribution network grounding fault location method and device.

Background technique

The 10kV power grid system is a small-current grounding system, especially the arc-suppression coil compensation grounding system. After single-phase grounding, the steady-state fault characteristics are not obvious, and the conventional algorithm cannot be selected accurately. The algorithm that can accurately obtain the transient characteristic quantity is realized. It is difficult to get up. If the ground fault occurs on the distribution line and cannot be cut off for a long time, after the distribution line falls to the ground, it is easy to endanger the passing pedestrians due to step voltage or contact voltage. Moreover, when the grounding current exceeds a certain range, the arc is difficult to extinguish by itself, and it is easy to burn the distribution line, cause a fire, and seriously affect the reliability of power supply. It caused the loss of equipment and load, and also caused serious social impact.

With the rapid development of distribution automation, in order to quickly realize the full coverage of distribution line automation, intelligent terminals such as DTU, FTU, and fault indicators are mainly used. In particular, fault indicators are widely used due to their advantages such as high cost performance, easy installation, and no power outage For overhead line fault indication and judgment. However, due to factors such as the design of the fault indicator itself, the manufacturing quality of the manufacturer, and the on-site environment, there are problems such as indicator misoperation, refusal to operate, inability to capture transient information with high precision, and out-of-synchronization of recorded wave data, which lead to fault location and failure of the fault indicator. Inaccurate research and judgment will bring a lot of inconvenience to fault isolation and emergency repair work.

Contents of the invention

In view of the above-mentioned defects of the prior art, the object of the present invention is to provide a distribution network ground fault location method and device based on wide-area synchronization, to avoid sensor malfunction and refusal, and to improve equipment reliability. At the same time, The zero-sequence voltage monitoring module at the end of each outgoing line can send the recorded voltage waveform back to the edge agent module on the side of the bus to realize the precise location of the fault point.

One of the objects of the present invention is achieved through such a technical solution, a method for locating a ground fault in a distribution network based on wide-area synchronization, the method comprising the following steps:

Obtain the zero-sequence voltage change time on the bus side according to the voltage change on the bus side;

Obtain the zero-sequence voltage change time at the end of the line according to the voltage change at the end of the line;

The fault location is determined according to the zero-sequence voltage variation time at the bus side and the zero-sequence voltage variation time at the end of the line.

Optionally, the zero-sequence voltage change time on the bus side is obtained according to the voltage change on the bus side, including:

When the bus side voltage changes, obtain the voltage change time of the bus side;

Intercepting a specified number of bus-side voltage cycles before and after the time of the bus-side voltage change, and integrating the bus-side voltage cycles into a bus-side zero-sequence voltage waveform;

performing linear fitting on the zero-sequence voltage waveform on the bus side based on the voltage change time on the bus side;

According to the result of linear fitting, the voltage variation time on the bus side is corrected.

Optionally, after obtaining the zero-sequence voltage change time on the bus side according to the voltage change on the bus side, the method further includes: recording waves for each outgoing line, including:

Sensor units are arranged in sections on each outgoing line, and the sensor units of each outgoing line are started to record waves at the moment of the voltage change on the side of the bus;

Intercepting a specified number of current cycles before and after the bus-side voltage change moment, and integrating the current cycles into a zero-sequence current waveform;

Preliminary fault line selection and location are performed based on the zero-sequence current waveform.

Optionally, the zero-sequence voltage change time at the end of the line is obtained according to the voltage change at the end of the line, including:

When a voltage change at the end of the line is detected at the end of the outgoing line, the time of the voltage change at the end of the line is obtained;

Intercepting a specified number of voltage cycles at the end of the line before and after the voltage change at the end of the line, and integrating the voltage cycles at the end of the line into a zero-sequence voltage waveform at the end of the line;

performing linear fitting on the zero-sequence voltage waveform at the end of the line based on the voltage change moment at the end of the line;

According to the result of linear fitting, the voltage variation moment at the end of the line is corrected.

Optionally, the fault location is determined according to the zero-sequence voltage change time at the bus side and the zero-sequence voltage change time at the line end, including:

Determining the fault line and the fault section according to the preliminary fault line selection and location results;

The location of the fault point is determined according to the fault line and the fault section and based on the corrected voltage change time at the end of the line and the corrected voltage change time at the bus side.

The second object of the present invention is achieved through such a technical solution, a distribution network ground fault location device based on wide-area synchronization, the device includes:

The bus edge agent module is used to obtain the zero-sequence voltage change time on the bus side according to the voltage change on the bus side;

The line zero-sequence voltage monitoring module is used to obtain the zero-sequence voltage change time at the line end according to the voltage change at the line end;

The bus edge agent module is also used to determine the fault location according to the bus side zero-sequence voltage change time and the line end zero-sequence voltage change time.

Optionally, the bus edge agent module is specifically used for:

When the bus side voltage changes, obtain the voltage change time of the bus side;

Intercepting a specified number of bus-side voltage cycles before and after the time of the bus-side voltage change, and integrating the bus-side voltage cycles into a bus-side zero-sequence voltage waveform;

performing linear fitting on the zero-sequence voltage waveform on the bus side based on the voltage change time on the bus side;

According to the result of linear fitting, the voltage variation time on the bus side is corrected.

Optionally, the device also includes a sensor unit;

The sensor units are arranged on each outgoing line in sections, and at the moment of the voltage change on the side of the bus, the bus edge agent module is used to start the sensor units of each outgoing line to record waves;

The bus edge agent module is also used to intercept a specified number of current cycles before and after the voltage change on the bus side, and integrate the current cycles into a zero-sequence current waveform;

Preliminary fault line selection and location are performed based on the zero-sequence current waveform.

Optionally, the line zero-sequence voltage monitoring module is specifically used for

When a voltage change at the end of the line is detected at the end of the outgoing line, the time of the voltage change at the end of the line is obtained;

Intercepting a specified number of voltage cycles at the end of the line before and after the voltage change at the end of the line, and integrating the voltage cycles at the end of the line into a zero-sequence voltage waveform at the end of the line;

performing linear fitting on the zero-sequence voltage waveform at the end of the line based on the voltage change moment at the end of the line;

According to the result of linear fitting, the voltage variation moment at the end of the line is corrected.

Optionally, the bus edge agent module is specifically configured to determine the fault line and the fault section according to the preliminary fault line selection and location results;

The location of the fault point is determined according to the fault line and the fault section and based on the corrected voltage change time at the end of the line and the corrected voltage change time at the bus side.

Due to the adoption of the above technical solution, the present invention has the following advantages: the technical solution of the present invention can avoid sensor misoperation and refusal to improve the reliability of the equipment. The recorded voltage waveform is transmitted back to the edge agent module on the bus side to realize the precise location of the fault point.

Other advantages, objects and features of the present invention will be set forth in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the investigation and research below, or can be obtained from Taught in the practice of the present invention.

Description of drawings

The accompanying drawings of the present invention are as follows:

Fig. 1 is the flowchart of the first embodiment of the present invention;

Fig. 2 is a schematic diagram of connection relationship according to the second embodiment of the present invention.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

The first embodiment of the present invention proposes a distribution network ground fault location method based on wide-area synchronization, the method includes the following steps:

Obtain the zero-sequence voltage change time on the bus side according to the voltage change on the bus side;

Obtain the zero-sequence voltage change time at the end of the line according to the voltage change at the end of the line;

The fault location is determined according to the zero-sequence voltage variation time at the bus side and the zero-sequence voltage variation time at the end of the line.

The method of the present invention avoids sensor misoperation and refusal to operate, and improves equipment reliability. At the same time, the voltage waveform of the recorded wave can be transmitted back to the edge agent module on the side of the bus through the zero-sequence voltage monitoring module at the end of each outgoing line, so as to realize the fault point precise positioning.

Optionally, the zero-sequence voltage change time on the bus side is obtained according to the voltage change on the bus side, including:

When the bus side voltage changes, obtain the voltage change time of the bus side;

Intercepting a specified number of bus-side voltage cycles before and after the time of the bus-side voltage change, and integrating the bus-side voltage cycles into a bus-side zero-sequence voltage waveform;

performing linear fitting on the zero-sequence voltage waveform on the bus side based on the voltage change time on the bus side;

According to the result of linear fitting, the voltage variation time on the bus side is corrected.

Specifically, step S1: when the edge proxy module on the bus side detects a voltage change, record the zero-sequence voltage change time;

When the bus edge agent module detects a bus voltage change, according to the detected change time t01, it intercepts the voltage waveforms of the first 4 cycles and the last 8 cycles at this time, and the sampling frequency is 256 points per cycle, and then the three-phase voltage waveform Merge them into zero-sequence voltage waveforms, and then perform straight line fitting on the first 5 sampling data and the last 5 sampling data of t01 in the zero-sequence voltage waveform sampling data, respectively calculate the zero-sequence voltage and zero axis crossing time as t02 and t03, take The average value of t02 and t03 is T01 (when there is no unbalanced voltage before the fault, take T01=t03), and the time to correct the zero-sequence voltage change is T01.

Optionally, after obtaining the zero-sequence voltage change time on the bus side according to the voltage change on the bus side, the method further includes: recording waves for each outgoing line, including:

Sensor units are arranged in sections on each outgoing line, and the sensor units of each outgoing line are started to record waves at the moment of the voltage change on the side of the bus;

Intercepting a specified number of current cycles before and after the bus-side voltage change moment, and integrating the current cycles into a zero-sequence current waveform;

Preliminary fault line selection and location are performed based on the zero-sequence current waveform.

Step S2: The bus measuring edge agent module starts the wave recording of the sensor units installed in each outgoing line;

Specifically, the edge proxy module on the side of the bus starts the wave recording of the sensor units installed on each outgoing line, and the starting time is t1, intercepting the current waveforms of the first 4 cycles and the last 8 cycles at this time, and the sampling frequency is 256 points per cycle, and Combined into the zero-sequence current waveform, take the sampling data of the second half cycle of t1, which can avoid the influence of the arc suppressing coil, and calculate the sudden change direction of the zero-sequence current. According to the opposite direction of the zero-sequence current before and after the fault point of the fault line, the first The zero-sequence current mutation direction at the terminal is opposite, and the preliminary line selection and positioning are carried out, and the zero-sequence current mutation time is recorded at the same time. The upstream and downstream mutation times of the fault point are respectively recorded as Txm and Txn.

Optionally, the zero-sequence voltage change time at the end of the line is obtained according to the voltage change at the end of the line, including:

When a voltage change at the end of the line is detected at the end of the outgoing line, the time of the voltage change at the end of the line is obtained;

Intercepting a specified number of voltage cycles at the end of the line before and after the voltage change at the end of the line, and integrating the voltage cycles at the end of the line into a zero-sequence voltage waveform at the end of the line;

performing linear fitting on the zero-sequence voltage waveform at the end of the line based on the voltage change moment at the end of the line;

According to the result of linear fitting, the voltage variation moment at the end of the line is corrected.

Specifically, step S3: install a zero-sequence voltage monitoring module at each outlet end, and record the zero-sequence voltage change time;

When the zero-sequence voltage monitoring module at the end of each outgoing line detects a voltage change, according to the detected change time tx1, intercept the voltage waveform of the first 4 cycles and the last 8 cycles at this time (the sampling frequency is 256 points per cycle), and The three-phase voltage waveforms are combined into a zero-sequence voltage waveform, and the first 5 sampling data and the last 5 sampling data of tx2 in the zero-sequence voltage waveform sampling data are respectively fitted with a straight line, and the zero-sequence voltage and the zero-axis crossing time are respectively calculated as tx2 and For tx3, take the average value of tx2 and tx3 as Tx1 (when there is no unbalanced voltage before the fault, take Tx1=tx3), and correct the moment of zero-sequence voltage change as Tx1.

Optionally, the fault location is determined according to the zero-sequence voltage change time at the bus side and the zero-sequence voltage change time at the line end, including:

Determining the fault line and the fault section according to the preliminary fault line selection and location results;

The location of the fault point is determined according to the fault line and the fault section and based on the corrected voltage change time at the end of the line and the corrected voltage change time at the bus side.

Specifically, step S4: the edge agent module fuses the zero-sequence voltage monitoring modules of each end and the wave recording data of sensors on the line to accurately complete line selection and positioning.

According to the result of the line selection in step S2, the edge proxy module on the bus side locates the fault of the outgoing line of x, and initially completes the positioning of the section as between the xm sensor and the xn sensor; The recorded waveform returned by the zero-sequence voltage monitoring module at the end of the outgoing line and the zero-sequence voltage change time Tx1, according to the distance L of the installation position of the zero-sequence voltage monitoring module on the bus in the system model, and the upstream and downstream zero-sequence current mutation time of the fault point respectively Recorded as Txm and Txn, the location of the fault point can be accurately calculated.

According to the wide-area synchronization-based distribution network grounding fault location method of the present invention, the sensor unit on the line is started after the edge proxy terminal on the busbar side detects the zero-sequence voltage abnormality, which avoids sensor misoperation and refusal to operate, and improves The reliability of the equipment is improved; the bus side edge proxy terminal, the sensor unit and the zero-sequence voltage detection device at the end of the line are all equipped with a GPS time synchronization module, and the sampling frequency reaches 256 points per cycle. The sampling accuracy is high, and the transient process can be accurately captured. Complete the line selection and section positioning before the arc suppression coil interference; adopt the principle that the zero-sequence voltage and zero-sequence current have different conduction times on the line, and integrate the line sensor and the zero-sequence voltage detection device at the end of the line to detect the zero-sequence voltage and zero-sequence current. , Accurately calculate the location of the fault point; greatly reduce the operation and maintenance cost, and have a wide range of application and promotion.

The second embodiment of the present invention proposes a distribution network ground fault location device based on wide-area synchronization, as shown in Figure 2, the device includes:

The bus edge agent module is used to obtain the zero-sequence voltage change time on the bus side according to the voltage change on the bus side;

The line zero-sequence voltage monitoring module is used to obtain the zero-sequence voltage change time at the line end according to the voltage change at the line end;

The bus edge agent module is also used to determine the fault location according to the bus side zero-sequence voltage change time and the line end zero-sequence voltage change time.

The method of the present invention avoids sensor misoperation and refusal to operate, and improves equipment reliability. At the same time, the voltage waveform of the recorded wave can be transmitted back to the edge agent module on the side of the bus through the zero-sequence voltage monitoring module at the end of each outgoing line, so as to realize the fault point precise positioning.

Optionally, in an optional embodiment of the present invention, the bus edge agent module is specifically used for:

When the bus side voltage changes, obtain the voltage change time of the bus side;

Intercepting a specified number of bus-side voltage cycles before and after the time of the bus-side voltage change, and integrating the bus-side voltage cycles into a bus-side zero-sequence voltage waveform;

performing linear fitting on the zero-sequence voltage waveform on the bus side based on the voltage change time on the bus side;

According to the result of linear fitting, the voltage variation time on the bus side is corrected.

When the bus edge agent module detects a bus voltage change, according to the detected change time t01, it intercepts the voltage waveforms of the first 4 cycles and the last 8 cycles at this time, and the sampling frequency is 256 points per cycle, and then the three-phase voltage waveform Merge them into zero-sequence voltage waveforms, and then perform straight line fitting on the first 5 sampling data and the last 5 sampling data of t01 in the zero-sequence voltage waveform sampling data, respectively calculate the zero-sequence voltage and zero axis crossing time as t02 and t03, take The average value of t02 and t03 is T01 (when there is no unbalanced voltage before the fault, take T01=t03), and the time to correct the zero-sequence voltage change is T01.

Optionally, in an optional embodiment of the present invention, the device further includes a sensor unit;

The sensor units are arranged on each outgoing line in sections, and at the moment of the voltage change on the side of the bus, the bus edge agent module is used to start the sensor units of each outgoing line to record waves;

The bus edge agent module is also used to intercept a specified number of current cycles before and after the voltage change on the bus side, and integrate the current cycles into a zero-sequence current waveform;

Preliminary fault line selection and location are performed based on the zero-sequence current waveform.

Specifically, the edge proxy module on the side of the bus starts the wave recording of the sensor units installed on each outgoing line, and the starting time is t1, intercepting the current waveforms of the first 4 cycles and the last 8 cycles at this time, and the sampling frequency is 256 points per cycle, and Combined into the zero-sequence current waveform, take the sampling data of the second half cycle of t1, which can avoid the influence of the arc suppressing coil, and calculate the sudden change direction of the zero-sequence current. According to the opposite direction of the zero-sequence current before and after the fault point of the fault line, the first The zero-sequence current mutation direction at the terminal is opposite, and the preliminary line selection and positioning are carried out, and the zero-sequence current mutation time is recorded at the same time. The upstream and downstream mutation times of the fault point are respectively recorded as Txm and Txn.

Optionally, in an optional embodiment of the present invention, the line zero-sequence voltage monitoring module is specifically used for

When a voltage change at the end of the line is detected at the end of the outgoing line, the time of the voltage change at the end of the line is obtained;

Intercepting a specified number of voltage cycles at the end of the line before and after the voltage change at the end of the line, and integrating the voltage cycles at the end of the line into a zero-sequence voltage waveform at the end of the line;

performing linear fitting on the zero-sequence voltage waveform at the end of the line based on the voltage change moment at the end of the line;

According to the result of linear fitting, the voltage variation moment at the end of the line is corrected.

When the zero-sequence voltage monitoring module at the end of each outgoing line detects a voltage change, according to the detected change time tx1, intercept the voltage waveform of the first 4 cycles and the last 8 cycles at this time (the sampling frequency is 256 points per cycle), and The three-phase voltage waveforms are combined into a zero-sequence voltage waveform, and the first 5 sampling data and the last 5 sampling data of tx2 in the zero-sequence voltage waveform sampling data are respectively fitted with a straight line, and the zero-sequence voltage and the zero-axis crossing time are respectively calculated as tx2 and For tx3, take the average value of tx2 and tx3 as Tx1 (when there is no unbalanced voltage before the fault, take Tx1=tx3), and correct the moment of zero-sequence voltage change as Tx1.

Optionally, in an optional embodiment of the present invention, the bus edge agent module is specifically configured to determine a faulty line and a faulty section according to the preliminary faulty line selection and location results;

The location of the fault point is determined according to the fault line and the fault section and based on the corrected voltage change time at the end of the line and the corrected voltage change time at the bus side.

According to the result of the line selection in step S2, the edge proxy module on the bus side locates the fault of the outgoing line of x, and initially completes the positioning of the section as between the xm sensor and the xn sensor; The recorded waveform returned by the zero-sequence voltage monitoring module at the end of the outgoing line and the zero-sequence voltage change time Tx1, according to the distance L of the installation position of the zero-sequence voltage monitoring module on the bus in the system model, and the upstream and downstream zero-sequence current mutation time of the fault point respectively Recorded as Txm and Txn, the location of the fault point can be accurately calculated.

Owing to adopting above-mentioned technical scheme, the present invention has following advantage:

(1) The sensor unit on the line is started after detecting the zero-sequence voltage abnormality by the edge proxy terminal on the bus side, which avoids sensor misoperation and refusal to operate, and improves equipment reliability;

(2) The proxy terminal at the edge of the busbar, the sensor unit and the zero-sequence voltage detection device at the end of the line are all equipped with a GPS time synchronization module. The sampling frequency reaches 256 points per cycle. The sampling accuracy is high, and the transient process can be accurately captured. Complete line selection and section positioning before coil interference;

(3) Using the principle that zero-sequence voltage and zero-sequence current have different conduction times on the line, the line sensor and the zero-sequence voltage detection device at the end of the line are used to accurately calculate the time of zero-sequence voltage and zero-sequence current change to obtain the location of the fault point.

(4) The cost of operation and maintenance is greatly reduced, and the scope of application and promotion is wide.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall fall within the protection scope of the present invention.

Claims (8)

1. a kind of distribution net work earthing fault localization method synchronous based on wide area, which is characterized in that the method includes following step It is rapid:

The bus bar side residual voltage unusual fluctuation time is obtained according to the voltage unusual fluctuation of bus bar side；

The line end residual voltage unusual fluctuation time is obtained according to the voltage unusual fluctuation of line end；

Abort situation is determined according to the bus bar side residual voltage unusual fluctuation time and line end residual voltage unusual fluctuation time；

According to the voltage unusual fluctuation of bus bar side obtain the bus bar side residual voltage unusual fluctuation time after, further include, to each outlet route into Row recording:

Sectional is arranged sensor unit and starts each outlet at the voltage unusual fluctuation moment of the bus bar side on each outlet route The sensor unit of route carries out recording；

The electric current cycle of bus bar side voltage unusual fluctuation moment front and back specified quantity is intercepted, and the electric current cycle is integrated into zero Sequence current waveform；

Preliminary fault line selection and fault locating is carried out based on the zero-sequence current waveform.

2. the method as described in claim 1, it is characterised in that: obtain bus bar side residual voltage according to the voltage unusual fluctuation of bus bar side The unusual fluctuation time, comprising:

In bus bar side voltage unusual fluctuation, the voltage unusual fluctuation moment of bus bar side is obtained；

Intercept the bus bar side voltage cycle of specified quantity before and after bus bar side voltage unusual fluctuation moment, and by the bus bar side voltage Cycle is integrated into bus bar side residual voltage waveform；

The voltage unusual fluctuation moment based on the bus bar side carries out linear fit to the bus bar side residual voltage waveform；

It is modified according to voltage unusual fluctuation moment of the result of linear fit to bus bar side.

3. method according to claim 2, it is characterised in that: obtain line end zero sequence according to the voltage unusual fluctuation of line end The voltage unusual fluctuation time, comprising:

When line end detects line end voltage unusual fluctuation, the voltage unusual fluctuation moment of line end is obtained；

Intercept the line end voltage cycle of specified quantity before and after voltage unusual fluctuation moment of the line end, and by the route Terminal voltage cycle is integrated into line end residual voltage waveform；

The voltage unusual fluctuation moment based on the line end carries out linear fit to the line end residual voltage waveform；

It is modified according to voltage unusual fluctuation moment of the result of linear fit to line end.

4. method as claimed in claim 3, it is characterised in that: according to the bus bar side residual voltage unusual fluctuation time and route The end residual voltage unusual fluctuation time determines abort situation, comprising:

Faulty line and fault section are determined according to the preliminary fault line selection and fault locating result；

According to the faulty line and fault section and the voltage unusual fluctuation moment based on the revised line end and repair The voltage unusual fluctuation moment of bus bar side after just determines position of failure point.

5. a kind of distribution net work earthing fault positioning device synchronous based on wide area, which is characterized in that described device includes:

Bus bar edges proxy module, for obtaining the bus bar side residual voltage unusual fluctuation time according to the voltage unusual fluctuation of bus bar side；

Route residual voltage monitoring modular, when for obtaining the unusual fluctuation of line end residual voltage according to the voltage unusual fluctuation of line end Between；

Bus bar edges proxy module is also used to according to the bus bar side residual voltage unusual fluctuation time and line end residual voltage The unusual fluctuation time determines abort situation；

Described device further includes sensor unit；

The sensor unit sectional is arranged on each outlet route, at the voltage unusual fluctuation moment of the bus bar side, the mother The sensor unit that line edge proxies module is used to start each outlet route carries out recording；

The bus bar edges proxy module is also used to intercept the electric current week of specified quantity before and after the bus bar side voltage unusual fluctuation moment Wave, and the electric current cycle is integrated into zero-sequence current waveform；

Preliminary fault line selection and fault locating is carried out based on the zero-sequence current waveform.

6. device as claimed in claim 5, which is characterized in that the bus bar edges proxy module is specifically used for:

In bus bar side voltage unusual fluctuation, the voltage unusual fluctuation moment of bus bar side is obtained；

Intercept the bus bar side voltage cycle of specified quantity before and after bus bar side voltage unusual fluctuation moment, and by the bus bar side voltage Cycle is integrated into bus bar side residual voltage waveform；

The voltage unusual fluctuation moment based on the bus bar side carries out linear fit to the bus bar side residual voltage waveform；

It is modified according to voltage unusual fluctuation moment of the result of linear fit to bus bar side.

7. device as claimed in claim 6, which is characterized in that the route residual voltage monitoring modular is specifically used for

When line end detects line end voltage unusual fluctuation, the voltage unusual fluctuation moment of line end is obtained；

Intercept the line end voltage cycle of specified quantity before and after voltage unusual fluctuation moment of the line end, and by the route Terminal voltage cycle is integrated into line end residual voltage waveform；

The voltage unusual fluctuation moment based on the line end carries out linear fit to the line end residual voltage waveform；

It is modified according to voltage unusual fluctuation moment of the result of linear fit to line end.

8. device as claimed in claim 7, which is characterized in that the bus bar edges proxy module is specifically used for according to Preliminary fault line selection and fault locating result determines faulty line and fault section；

According to the faulty line and fault section and the voltage unusual fluctuation moment based on the revised line end and repair The voltage unusual fluctuation moment of bus bar side after just determines position of failure point.