CN107561405B - Fault line selection positioning method and system based on non-contact sensing device - Google Patents
Fault line selection positioning method and system based on non-contact sensing device Download PDFInfo
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Abstract
The invention discloses a fault line selection positioning method based on a non-contact sensing device, which comprises the following steps: s1) presetting a threshold value of the zero sequence voltage signal; s2) recording the wave of the bus section in the transformer substation and the off-station line corresponding to the bus section; s3) starting fault detection and recording fault recording data with absolute time labels; s4) searching, calculating and determining the maximum amplitude section of the zero sequence current signal, and performing fault line selection in the transformer substation; s5) matching zero sequence voltage and zero sequence current with absolute time labels on corresponding off-station lines on fault lines in the transformer substation and fault recording data before and after a starting fault detection time point; s6) processing the wave recording information on the off-station line to obtain processed data; and judging and determining a fault section according to the processing data. The invention also discloses a system of the fault line selection positioning method based on the non-contact sensing device.
Description
Technical Field
The invention relates to the fields of communication, line fault detection and the like, in particular to a fault line selection positioning method and system based on a non-contact sensing device.
Background
A6-66 kV power distribution network in China widely operates in a neutral point non-effective grounding mode and is a low-current grounding system. In order to improve the power supply reliability, a low-current grounding line selection device is generally installed in a station. The current applied small current grounding line selection device mostly adopts a transient line selection method. The power distribution network adopts a radial network, the line is long, the branches are numerous, the structure is complex, and even if the fault outgoing line is determined, the fault point is difficult to search.
The patent 'a small current earth fault location method based on transient current waveform comparison' proposes a new section location method based on transient zero-mode current comparison, which integrates the similarity relation and polarity characteristics of transient currents between upstream and downstream, and eliminates the location blind zone, and improves the reliability and adaptability of the transient location principle. However, the algorithm is only applicable to the situation of monitoring the trunk line (that is, two adjacent monitoring points are arranged on two sides of each section), and cannot be adapted to the situation of monitoring the branch line (that is, there are sections surrounded by three or more monitoring points).
The patent "small current earth fault location method based on transient reactive power direction" proposes a method for locating faults by using a transient reactive power direction method, but does not mention how to reduce absolute time errors of different sampling points and how to obtain reference zero sequence voltage at each point.
The patent 'a method for locating distributed small current ground fault' proposes that information is transmitted by using mutual transmission information of adjacent power distribution terminals, and a similarity coefficient of adjacent zero-sequence currents is calculated to detect a fault section and/or a suspected fault section, and a main station is not required to participate in the judgment process of the fault section. However, a method for judging the power direction by using zero sequence voltage is not mentioned, and the simultaneity of waveform acquisition of adjacent power distribution terminals cannot be guaranteed because different power distribution terminals do not adopt a GPS time synchronization module.
Disclosure of Invention
The purpose of the invention is: the fault line selection positioning method based on the non-contact sensing device can effectively solve the problem of fault positioning when a small current grounding system for monitoring a branch line has a single-phase grounding fault.
The technical scheme for realizing the purpose is as follows: a fault line selection positioning method based on a non-contact sensing device comprises the following steps: s1) presetting a threshold value of the zero-sequence voltage signal or the zero-sequence current signal; s2) recording waves of a bus section in the transformer substation and an off-station support line corresponding to the bus section, and keeping the recording frequencies in the transformer substation and outside the transformer substation consistent; s3) starting fault detection according to a preset zero sequence voltage threshold value and wave recording information, and recording fault wave recording data with an absolute time tag; s4) searching, calculating and determining the maximum amplitude section of the zero-sequence current signal, and performing fault line selection in the transformer substation by using a transient method according to data in the maximum amplitude section; s5) matching zero sequence voltage and zero sequence current with absolute time labels on corresponding off-station lines on fault lines in the transformer substation and fault recording data before and after a starting fault detection time point; s6) processing wave recording information on the off-station line according to the zero sequence voltage and zero sequence current of the absolute time label and fault wave recording data before and after a starting fault detection time point to obtain processed data; and judging and determining a fault section according to the processing data.
in a preferred embodiment of the present invention, the step S3) includes: when the outgoing line of the monitored bus section has a fault, the low-current ground fault line selection device in the transformer substation is started firstly, and fault recording data with an absolute time tag are recorded, wherein the fault recording data comprise the first 10 cycles of a starting fault detection time point and the last 40 cycles of the starting fault detection time point.
In a preferred embodiment of the present invention, the S4) includes: calculating the 50 periodic wave data in the step S3) in a time window of 5ms, finding a maximum amplitude section of the zero sequence current signal, and performing fault line selection in the transformer substation by using a transient method according to data in the maximum amplitude section.
The maximum amplitude section takes the maximum section of the average value of the actual values of all sampling points within 5ms as the maximum amplitude section.
In a preferred embodiment of the present invention, the step S6) includes the following steps: s61) determining a fault line; s62) the out-of-station legs of each faulty line are segmented in sequence and marked as ai(ii) a S63) in each segment aiConfiguring j non-contact sensing devices, each segment AiThe corresponding processing data of the transient power direction of (1) is Dnj(ii) a S64) based on the processing data DnjThe formed array determines and identifies the faulty section.
In a preferred embodiment of the present invention, the step S64) includes that if all the values in the array are positive, the failure point is in the segment anThe endmost downstream; if all values in the array are negative, the failure point is in segment A1between the initial end and the bus bar; if D in the arraynjIf the values in (1) are not consistent and the processing data of other arrays are consistent, the fault section is in the section Ai(ii) a If the value in Dni in the array is consistent, the processing data of other arrays are consistent, if D is consistentnjIs downstream of the fault, the fault section is between the mounting positions of said non-contact sensing means of the last and first stations of the section Ai and downstream of the fault; if and DnjThe section in which the processing data has the same value in (A) is the failure upstream section, the failure section is the section AiBetween the first station and the mounting location of the non-contact sensing device of the last station upstream of the fault.
Another object of the invention is: a fault line selection positioning method system based on a non-contact sensing device.
The technical scheme for realizing the purpose is as follows: a fault line selection positioning method system based on a non-contact sensing device comprises a low-current grounding fault line selection device, the non-contact sensing device, a GPS time synchronization module and a communication module; the low-current ground fault line selection device is assembled in a transformer substation, and the non-contact sensing device is assembled on a line outside the transformer substation; the communication module is respectively configured on the low-current ground fault line selection device and the non-contact sensing device, and the GPS time synchronization module is respectively connected with the low-current ground fault line selection device and the non-contact sensing device; the small current ground fault line selection device is used for presetting a threshold value of a zero sequence voltage signal or a zero sequence current signal, recording waves of a bus section in a transformer substation, starting fault detection, searching, calculating and determining a maximum amplitude section of the zero sequence current signal according to the preset threshold value of the zero sequence voltage and recording information, performing fault line selection in the transformer substation according to data in the maximum amplitude section by using a transient method, and sending data information to the non-contact sensing device, wherein the data information comprises zero sequence voltage with an absolute time label, zero sequence current and fault recording data before and after a starting fault detection time point; the non-contact sensing device is used for recording waves of an off-station support line corresponding to a bus section in a transformer substation and processing detected wave recording information according to data information sent by the low-current ground fault line selection device to obtain processing data, and sending the processing data to the low-current ground fault line selection device; the low-current ground fault line selection device judges and determines a fault section according to the processing data; and the wave recording frequencies inside and outside the transformer substation are consistent.
In a preferred embodiment of the present invention, each of the off-station supporting lines has a plurality of segments, and each segment has a plurality of the non-contact sensing devices.
In a preferred embodiment of the present invention, the non-contact sensing device includes a sensing coil, a processing unit; the sensing coil is connected to the processing unit and used for sensing a zero sequence transient current signal.
In a preferred embodiment of the present invention, the communication module is a 4G communication module.
The invention has the advantages that: according to the fault line selection positioning method and system based on the non-contact sensing device, a fault line is selected through the in-station line selection device, and the fault section is found out by utilizing the waveform sent by the non-contact sensing device.
Drawings
the invention is further explained below with reference to the figures and examples.
FIG. 1 is a schematic diagram of a monitoring system based on a non-contact transient signal sensing device;
FIG. 2 is a schematic view of a non-contact transient signal sensor installation;
FIG. 3 is a schematic diagram of fault section determination;
FIG. 4 is a flow chart illustrating the steps of a fault line selection and location method based on a non-contact sensing device;
Fig. 5 is a flowchart of the detailed steps of step S6) in fig. 4.
Wherein the content of the first and second substances,
1, a low-current ground fault line selection device; 2 a non-contact sensing device; and 3, a communication module.
Detailed Description
The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. The directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc., refer to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention.
in the embodiment, as shown in fig. 1-2, a system of a fault line selection positioning method based on a non-contact sensing device is applied to line selection and fault section positioning of a low-current ground fault of a transformer substation of 110kV and below. The system of the fault line selection positioning method based on the non-contact sensing device 2 comprises a low-current grounding fault line selection device 1, the non-contact sensing device 2, a GPS time synchronization module and a communication module 4; the low-current ground fault line selection device 1 is assembled in a transformer substation, and the non-contact sensing device 2 is assembled on a line outside the transformer substation; the communication module 4 is respectively configured on the low-current ground fault line selection device 1 and the non-contact sensing device 2, and in this embodiment, the GPS time synchronization module is respectively connected to the low-current ground fault line selection device 1 and the non-contact sensing device 2.
Each of the off-station support lines is provided with a plurality of segments, and each segment is provided with a plurality of the non-contact sensing devices 2. The non-contact sensing device 2 comprises a sensing coil and a processing unit; the sensing coil is connected to the processing unit and used for sensing a zero sequence transient current signal. The communication module 4 is a 4G communication module 4. In this embodiment, the communication module 4 and the GPS time setting module may be configured in the non-contact sensing device 2 one to one. The communication module 4 is a 4G communication module 4.
The small current ground fault line selection device 1 is used for presetting a threshold value of a zero sequence voltage signal or a zero sequence current signal, recording a wave of a bus section in a transformer substation, starting fault detection and searching, calculating and determining a maximum amplitude section of the zero sequence current signal according to the preset threshold value of the zero sequence voltage and recording information, performing fault line selection in the transformer substation according to data in the maximum amplitude section by using a transient method, and sending data information to the non-contact sensing device 2, wherein the data information comprises zero sequence voltage with an absolute time label, zero sequence current and fault recording data before and after a starting fault detection time point; the non-contact sensing device 2 is used for recording waves of an off-station line corresponding to a bus section in a transformer substation and processing detected wave recording information according to data information sent by the low-current ground fault line selection device 1 to obtain processing data, and sending the processing data to the low-current ground fault line selection device 1; the low-current ground fault line selection device 1 judges and determines a fault section according to the processing data; and the wave recording frequencies inside and outside the transformer substation are consistent.
As shown in fig. 3 to 5, the positioning method implemented based on the fault line selection positioning system based on the non-contact sensing device specifically includes the following steps.
s1) the threshold value of the zero sequence voltage signal or the zero sequence current signal of the small current ground fault line selection device 1 is preset.
s2) recording the wave of the bus section in the transformer substation and the corresponding out-of-station line of the bus section, and keeping the wave recording frequency in the transformer substation consistent with that outside the transformer substation.
in the step, after normal debugging and commissioning are finished, the low-current ground fault line selection device 1 in the transformer substation normally records waves and starts detection according to a set zero sequence voltage starting threshold value, and the non-contact type sensing device on the off-station line normally records waves and receives fault starting information of the low-current ground fault line selection device 1 in the station in real time. The recording frequency is at least 6.4KHz and above.
S3) starting fault detection according to the preset zero sequence voltage threshold value and the recording information, and recording fault recording data with absolute time labels.
The step S3) includes: when the outgoing line of the monitored bus section has a fault, the low-current ground fault line selection device 1 in the transformer substation is firstly started, and fault recording data with an absolute time tag are recorded, wherein the fault recording data comprise the first 10 cycles of a starting fault detection time point and the last 40 cycles of the starting fault detection time point: that is, in this step, when the outgoing line of the monitored bus section has a fault, the in-station low-current ground fault line selection device 1 is firstly started, and records fault recording data with absolute time labels, including 10 cycles before starting and 40 cycles after starting.
S4) searching, calculating and determining the maximum amplitude section of the zero sequence current signal, and performing fault line selection in the transformer substation according to data in the maximum amplitude section by using a transient method.
The S4) includes: calculating the 50 periodic wave data in the step S3) in a time window of 5ms, finding a maximum amplitude section of the zero sequence current signal, and performing fault line selection in the transformer substation by using a transient method according to data in the maximum amplitude section. The maximum amplitude section takes the average maximum section of actual values of all sampling points within 5ms as the maximum amplitude section: in this step, after the start, 50 cycles of data are calculated in a time window of 5ms, a maximum amplitude section of the zero sequence current signal is found, and fault line selection is performed by using a transient method according to the data in the section.
S5) matching zero sequence voltage and zero sequence current with absolute time labels on the corresponding off-station branch on the fault line in the substation and fault recording data before and after the starting fault detection time point.
In this step, after a faulty line is selected in the substation, messages are sent to all non-contact sensing devices on the faulty line, and data are retrieved. The transmitted message content includes a starting time point with an absolute time tag, a zero sequence voltage and a zero sequence current. The data of the zero sequence voltage and the zero sequence current are data in the largest fault section of line selection by using a transient method.
s6) processing wave recording information on the off-station line according to the zero sequence voltage and zero sequence current of the absolute time label and fault wave recording data before and after a starting fault detection time point to obtain processed data; and judging and determining a fault section according to the processing data. And calculating the zero sequence voltage and the zero sequence current with the absolute time labels and data before and after the self starting point according to the requirements, and sending the calculated values to the in-station device. The calculation method comprises the methods of comparing the zero sequence power direction, the zero sequence current and the wave recording waveform of the non-contact sensing device and the like. The station device, here the low current ground fault line selection device 1, determines the fault section by comparing and judging the received data.
specifically, the step S6) includes the following steps.
s61) determining a faulty line.
S62) the out-of-station legs of each faulty line are segmented in sequence and marked as ai. If a fault line A, numbering is carried out according to the installation position of the non-contact type sensing device of the fault line A on the line, and the number is decomposed into A1、A2、A3、A4And A5And 5 sections are waited. Suppose that each segment has n1, n2, n3,n4 and n5 non-contact sensing devices, the transient power direction arrays received from all the sensing devices in the station are respectively Dn1、D n2、D n3、D n4And D n5。
S63) in each segment aiConfiguring j non-contact sensing devices, each segment AiThe corresponding processing data of the transient power direction of (1) is Dnj。
S64) based on the processing data DnjThe formed array determines and identifies the faulty section. Said step S64) includes that if the values in all the arrays are positive, the failure point is in segment anThe endmost downstream; if all values in the array are negative, the failure point is in segment A1between the initial end and the bus bar; if D in the arraynjIf the values in (1) are not consistent and the processing data of other arrays are consistent, the fault section is in the section Ai(ii) a If the value in Dni in the array is consistent, the processing data of other arrays are consistent, if D is consistentnjIs downstream of the fault, the fault section is between the mounting positions of said non-contact sensing means of the last and first stations of the section Ai and downstream of the fault; if and DnjThe section in which the processing data has the same value in (A) is the failure upstream section, the failure section is the section AiBetween the first station and the mounting location of the non-contact sensing device of the last station upstream of the fault.
the present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A fault line selection positioning method based on a non-contact sensing device is characterized by comprising the following steps:
s1) presetting a threshold value of the zero-sequence voltage signal or the zero-sequence current signal;
S2) recording waves of a bus section in the transformer substation and an off-station support line corresponding to the bus section, and keeping the recording frequencies in the transformer substation and outside the transformer substation consistent;
S3) starting fault detection according to a preset zero sequence voltage threshold value and wave recording information, and recording fault wave recording data with an absolute time tag;
S4) searching, calculating and determining the maximum amplitude section of the zero-sequence current signal, and performing fault line selection in the transformer substation by using a transient method according to data in the maximum amplitude section;
S5) matching zero sequence voltage and zero sequence current with absolute time labels on corresponding off-station lines on fault lines in the transformer substation and fault recording data before and after a starting fault detection time point;
s6) processing wave recording information on the off-station line according to the zero sequence voltage and zero sequence current of the absolute time label and fault wave recording data before and after a starting fault detection time point to obtain processed data; judging and determining a fault section according to the processing data;
The step S6) includes the steps of:
S61) determining a fault line;
s62) the out-of-station legs of each faulty line are segmented in sequence and marked as ai；
S63) in each segment aiconfiguring j non-contact sensing devices, each segment AiThe corresponding processing data of the transient power direction of (1) is Dnj；
S64) based on the processing data DnjJudging and determining a fault section by the formed array; said step S64) includes
If all values in the array are positive, the failure point is in segment AnThe endmost downstream;
If all values in the array are negative, the failure point is in segment A1Between the initial end and the bus bar;
If D in the arraynjIf the values in (1) are not consistent and the processing data of other arrays are consistent, the fault section is in the section Ai；
If D in the arraynjThe value in (1) is consistent with the value in (D), and the processing data of other arrays are consistent with the value in (D)njIs a fault downstream, the faulty section is in section aiBetween the last station of (a) and the mounting location of the non-contact sensing device of the first station downstream of the fault; if and DnjThe section in which the processing data has the same value in (A) is the failure upstream section, the failure section is the section AiBetween the first station and the mounting location of the non-contact sensing device of the last station upstream of the fault.
2. The fault line selection and positioning method based on the non-contact sensing device according to claim 1, wherein the step S3) comprises: when the outgoing line of the monitored bus section has a fault, the low-current ground fault line selection device in the transformer substation is started firstly, and fault recording data with an absolute time tag are recorded, wherein the fault recording data comprise the first 10 cycles of a starting fault detection time point and the last 40 cycles of the starting fault detection time point.
3. The fault line selection and positioning method based on the non-contact sensing device according to claim 2, wherein the S4) comprises: calculating the 50 periodic wave data in the step S3) in a time window of 5ms, finding a maximum amplitude section of the zero sequence current signal, and performing fault line selection in the transformer substation by using a transient method according to data in the maximum amplitude section.
4. The fault line selection and positioning method based on the non-contact sensing device as claimed in claim 3, wherein the maximum amplitude section is the maximum amplitude section which is the average value of the actual values of all sampling points within 5 ms.
5. The fault line selection positioning system based on the non-contact sensing device of the fault line selection positioning method based on the non-contact sensing device according to claim 1 is characterized by comprising a low-current ground fault line selection device, the non-contact sensing device, a GPS time synchronization module and a communication module; the low-current ground fault line selection device is assembled in a transformer substation, and the non-contact sensing device is assembled on a line outside the transformer substation; the communication module is respectively configured on the low-current ground fault line selection device and the non-contact sensing device, and the GPS time synchronization module is respectively connected with the low-current ground fault line selection device and the non-contact sensing device;
The small current ground fault line selection device is used for presetting a threshold value of a zero sequence voltage signal or a zero sequence current signal, recording waves of a bus section in a transformer substation, starting fault detection, searching, calculating and determining a maximum amplitude section of the zero sequence current signal according to the preset threshold value of the zero sequence voltage and recording information, performing fault line selection in the transformer substation according to data in the maximum amplitude section by using a transient method, and sending data information to the non-contact sensing device, wherein the data information comprises zero sequence voltage with an absolute time label, zero sequence current and fault recording data before and after a starting fault detection time point;
The non-contact sensing device is used for recording waves of an off-station support line corresponding to a bus section in a transformer substation and processing detected wave recording information according to data information sent by the low-current ground fault line selection device to obtain processing data, and sending the processing data to the low-current ground fault line selection device; the low-current ground fault line selection device judges and determines a fault section according to the processing data; and the wave recording frequencies inside and outside the transformer substation are consistent.
6. The system according to claim 5, wherein a plurality of segments are provided on each of the offsite support lines, and a plurality of the non-contact sensing devices are provided on each segment.
7. The fault line selection and positioning system based on the non-contact sensing device as claimed in claim 5, wherein the non-contact sensing device comprises a sensing coil, a processing unit; the sensing coil is connected to the processing unit and used for sensing a zero sequence transient current signal.
8. The system according to claim 5, wherein the communication module is a 4G communication module.
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| CN110596526A (en) * | 2019-07-09 | 2019-12-20 | 国网江苏省电力有限公司徐州供电分公司 | Distribution line fault detection positioning system and method based on zero sequence current |
| CN110426593A (en) * | 2019-08-22 | 2019-11-08 | 苏州银蕨电力科技有限公司 | A kind of method for locating single-phase ground fault based on residual voltage starting |
| CN110865279A (en) * | 2019-12-10 | 2020-03-06 | 苏州银蕨电力科技有限公司 | Single-phase earth fault positioning method based on neutral point earth current starting |
| CN112485713B (en) * | 2020-11-30 | 2022-08-16 | 云南电网有限责任公司电力科学研究院 | Line selection device and method based on zero-break characteristic of ground fault current |
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