CN112595923A - Positioning method for single-phase disconnection fault section of ungrounded system of power distribution network - Google Patents
Positioning method for single-phase disconnection fault section of ungrounded system of power distribution network Download PDFInfo
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- 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
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- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
本发明公开了一种用于配电网不接地系统单相断线故障区段的定位方法，包括步骤：在电力线路中设置多个检测点；对检测点进行标记，以母线出口至线路末端方向上的检测点，依次标记为第一检测点、第二检测点、第三检测点以及最后一个的第n检测点；将第一检测点标记为k，此时k=1；通过依次分析检测点k处各相电压的幅值差与相位差，逐步缩小故障区域段，以及最终确定故障区域段。对于检测点可利用已有的配电网自动化系统平台实现，适应性强，可靠性高，成本低，能够准确判定故障区段，保障运维人员及时对应进行检修，具有很高的工程应用价值。
The invention discloses a method for locating a single-phase disconnection fault section of an ungrounded system of a power distribution network, comprising the steps of: setting a plurality of detection points in a power line; marking the detection points, and taking the busbar outlet to the end of the line The detection points in the direction are marked as the first detection point, the second detection point, the third detection point and the last nth detection point in turn; the first detection point is marked as k, at this time k=1; through sequential analysis Detect the amplitude difference and phase difference of each phase voltage at point k, gradually reduce the fault area segment, and finally determine the fault area segment. The detection point can be realized by using the existing distribution network automation system platform, which has strong adaptability, high reliability, low cost, can accurately determine the fault section, and ensure that the operation and maintenance personnel can perform corresponding maintenance in a timely manner, which has high engineering application value. .
Description
Technical Field
The invention relates to the technical field of power distribution network relay protection, in particular to a positioning method for a single-phase disconnection fault section of a power distribution network ungrounded system.
Background
In power distribution networks, a line break fault has become one of the common faults. The line break fault is difficult to detect due to unobvious fault current, has little harm to power transmission and transformation equipment, and is far less emphasized in the operation and maintenance of a power grid as compared with a short-circuit fault. Due to the characteristics of the distribution lines, when a single-phase disconnection fault occurs on a feeder line, the changes of the phase voltage and the phase current of the bus line are not obvious, so that the phase voltage and the phase current are not easy to find, but the continuous asymmetric operation can generate adverse effects on users. CN106501668B discloses a traditional method for selecting a single-phase disconnection fault line of a power distribution network, wherein the disconnection fault line is selected according to the magnitude of the variation of the sum of amplitudes, but the method is limited to the condition of single-phase disconnection and grounding; CN106997019A discloses a method for monitoring single-phase disconnection of an ungrounded power system, which can effectively identify disconnection and ungrounded faults but cannot locate faults by monitoring the open-phase circuit at the first time by using a power system automation means.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a method for positioning a single-phase disconnection fault section of a power distribution network ungrounded system, which comprehensively utilizes the change rule of the amplitude and the phase of voltage when the single-phase disconnection ungrounded fault occurs, and has high reliability and strong adaptability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a positioning method for a single-phase disconnection fault section of a non-grounding system of a power distribution network comprises the following steps:
s1, setting a plurality of detection points in the power line;
s2, marking the detection points, and sequentially marking the detection points as a first detection point, a second detection point, a third detection point and a last nth detection point from the bus outlet to the detection point in the direction of the tail end of the line;
s3, marking the first detection point as k, where k is 1;
s4, judging whether the k value is less than or equal to n, and if yes, sequentially calculating the amplitude difference and the phase difference of each phase voltage at the detection point k; defining the phase voltage at the detection point k as
The amplitude difference and the phase difference are respectively
θ1＝||θA|-|θB||，θ2＝||θB|-|θC||，θ3＝||θC|-|θAL; if the k value is not less than or equal to n, determining that the fault area section is a section from the detection point n to the line tail end, and directly switching to S7;
s5, comparing the U at the detection point k respectively1And theta1，U2And theta2，U3And theta3The relationship between; if it satisfies (U)1≤0∩U3≥0)∩(θ1≤90°∪θ3Not more than 90 degrees), the broken line phase can be judged as the A phase; if it satisfies (U)1≥0∩U2≤0)∩(θ1≤90°∪θ2Not more than 90 degrees), the broken line phase can be judged as the B phase; if it satisfies (U)2≥0∩U3≤0)∩(θ2≤90°∪θ3Not more than 90 degrees), the broken line phase can be judged as the C phase; if any of the above three conditions is satisfied, the process proceeds to S6; otherwise k is automatically added with 1, and the step S4 is continuously executed;
s6, judging that the fault section is a section between a detection point k and a detection point k-1;
and S7, finishing judgment and determining a fault section.
Optionally, a plurality of feeder terminals are used to collect information of the phase voltages, the feeder terminals are respectively arranged at the detection points, and the feeder terminals are connected to the master station through a communication system.
Optionally, a plurality of fault indicators are used to collect information of the phase voltages, the fault indicators are respectively arranged on the detection points, and the fault indicators are connected with the master station through a communication system.
Optionally, the step of determining the fault section by ending the judgment includes:
the master station reports the disconnection information to the display terminal;
two adjacent detection point switches of the fault section are disconnected;
the tie switch is closed.
The disconnection type of the power distribution network can be divided into three conditions of fracture suspension, fracture front grounding and fracture rear grounding. There have been many analyses and studies on single-phase disconnection and grounding faults, but there are few methods for analyzing single-phase disconnection and grounding faults and for segment location. For example, the single-phase disconnection fault area judgment method based on the load monitor obtains the minimum disconnection area by defining the possible area and the impossible area where the single-phase disconnection fault occurs and performing difference set operation on the two areas, but the accuracy of the method depends on the wide layout of the feeder load monitoring points. The method for estimating the distribution transformer load change range and calculating the node current by utilizing the trapezoidal fuzzy number and judging the position of the disconnection fault according to the possibility that the node current is zero is greatly influenced by the operation mode of the line and has poor reliability. According to the line breaking fault line selection method based on energy measure, the occurrence of the line breaking fault can be judged by analyzing the general change rule of negative sequence current when the single-phase line breaking fault of the power distribution network occurs, but the fault section cannot be positioned. Therefore, the existing single-phase disconnection ungrounded fault section positioning method has certain limitation and cannot be widely applied to a power distribution system.
The invention has the following positive beneficial effects:
the amplitude and phase data of phase voltages are uploaded by a plurality of detection points arranged between a bus and a load, a main station receives and processes the amplitude and phase data and then carries out fault section positioning judgment, the change rule of the amplitude and phase of the phase voltage when a single-phase disconnection ungrounded fault occurs is analyzed, the fault area range is sequentially reduced, and the main station comprehensively analyzes the relation between the amplitude and the phase of each phase voltage of each detection point to finally judge the occurrence of the fault and determine a fault section. The detection point can be realized by using the existing distribution network automation system platform, the adaptability is strong, the reliability is high, the cost is low, the fault section can be accurately judged, operation and maintenance personnel can be guaranteed to correspondingly overhaul in time, and the method has high engineering application value.
Drawings
Fig. 1 is a schematic flowchart of a positioning method for a single-phase line break fault section of an ungrounded system of a power distribution network according to embodiment 1 of the present invention;
fig. 2 is a schematic distribution diagram of fault line monitoring points of a method for positioning a single-phase line break fault section of an ungrounded system of a power distribution network according to embodiment 1 of the present invention;
fig. 3 is a schematic system structure diagram of a method for positioning a single-phase line break fault section of an ungrounded system of a power distribution network according to embodiment 1 of the present invention;
FIG. 4 is a detection point S in the system shown in FIG. 3 according to embodiment 1 of the present invention4Simulating a waveform diagram of voltages relative to ground;
fig. 5 is a schematic block diagram of a method for determining a fault section according to embodiment 1 of the present invention.
Detailed Description
The invention will be further illustrated with reference to some specific embodiments.
Example 1
As shown in fig. 1 and fig. 2, a method for locating a single-phase line-break fault section of a non-grounded system of a power distribution network includes the steps of:
s1, setting a plurality of detection points in the power line;
s2, marking the detection points, and sequentially marking the detection points as a first detection point, a second detection point, a third detection point and a last nth detection point from the bus outlet to the detection point in the direction of the tail end of the line;
s3, marking the first detection point as k, where k is 1;
s4, judging whether the k value is less than or equal to n, and if yes, sequentially calculating the amplitude difference and the phase difference of each phase voltage at the detection point k; defining the phase voltage at the detection point k as
The amplitude difference and the phase difference are respectively
θ1＝||θA|-|θB||，θ2＝||θB|-|θC||，θ3＝||θC|-|θAL; if the k value is not less than or equal to n, determining that the fault area section is a section from the detection point n to the line tail end, and directly switching to S7;
s5, comparing the U at the detection point k respectively1And theta1，U2And theta2，U3And theta3The relationship between; if it satisfies (U)1≤0∩U3≥0)∩(θ1≤90°∪θ3Not more than 90 degrees), the broken line phase can be judged as the A phase; if it satisfies (U)1≥0∩U2≤0)∩(θ1≤90°∪θ2Not more than 90 degrees), the broken line phase can be judged as the B phase; if it satisfies (U)2≥0∩U3≤0)∩(θ2≤90°∪θ3Not more than 90 degrees), the broken line phase can be judged as the C phase; if any of the above three conditions is satisfied, the process proceeds to S6; otherwise k is automatically added with 1, and the step S4 is continuously executed;
s6, judging that the fault section is a section between a detection point k and a detection point k-1;
and S7, finishing judgment and determining a fault section.
The amplitude and phase data of phase voltage are uploaded by a plurality of detection points arranged between a bus and a load, the amplitude and phase data are received and processed by a main station, fault section positioning judgment is carried out, the change rule of the amplitude and phase of the phase voltage when a single-phase disconnection ungrounded fault occurs is analyzed, the fault area range is sequentially reduced, phase voltage information of each detection point is comprehensively analyzed by the main station, and finally the occurrence of the fault is judged and the fault section is determined. The method has the advantages of strong adaptability and high reliability, can accurately judge the fault section, ensures that operation and maintenance personnel can correspondingly overhaul in time, and has high engineering application value.
Specifically, the method can be implemented by using an existing distribution network automation system platform or a fault indicator system, namely phase voltage information is collected by using a Feeder Terminal (FTU) or a Fault Indicator (FI), a plurality of feeder terminals or fault indicators are respectively arranged on each detection point, the feeder terminals or the fault indicators are connected with a main station through a communication system, and after the phase voltage information of each detection point is reported to the main station, the main station comprehensively analyzes the phase voltage information of each detection point to judge the occurrence of a fault and determine a fault section.
As shown in fig. 3, the whole set of detection system consists of three parts: detection devices (here assumed to be feeder terminals) distributed at the respective detection points, a master station, and a communication system for contacting the respective detection devices with the master station. L is1、L2、L3、L 44 outgoing lines of the bus 1, wherein the line lengths are respectively L1＝3km、L2＝8.5km、L3＝12km、L4＝10km。S1、S2、S3、S'1、S'2、S'3Is a section switch and K is a tie switch. Suppose that a phase A of the system is broken and F is set as a broken line point, and the broken line point is positioned in the middle of a fault line (the distance from a bus is 50% of the length of the line). In this system, the relevant positive sequence parameters of the overhead line are: z1＝(0.17+j0.38)Ω/km，b1J3.045) us/km. Zero sequence parameter is Z0＝(0.23+j1.72)Ω/km，b0J1.884 us/km. The loads are connected in a triangular mode, and the equivalent load impedance of each line is uniformly Zl400 Ω. The system is used for verifying the effectiveness of the fault section positioning method. When the system normally operates, the amplitude and the phase variation of the phase voltage are small and do not reach a fixed value, and the feeder line terminal cannot be started. When single-phase disconnection non-grounding fault (such as S)3、S4A phase failure occurs therebetweenLine fault ungrounded fault), each feeder terminal continuously collects phase voltage information and detects that the phase included angle of two groups of phase voltages is smaller than or equal to 90 degrees, and the feeder terminal reports the phase voltage amplitude and the phase information with time labels to the main station. And after the master station collects the fault information of the power transformation line selection device and each feeder line terminal, the master station confirms whether a single-phase disconnection ungrounded fault occurs or not according to the voltage information of the line selection device, and exits from the power transformation line selection device for disturbance. Suppose that 4 detection points are arranged between the bus and the load in total, and suppose that S3And S4The A-phase disconnection fault is not grounded, and the single-phase disconnection fault is positioned by adopting the following steps:
the master station first determines the section upstream of detection point 1, i.e., when k is equal to 1. The main station defines the phase voltages as
And calculating the difference between the two subtracted amplitudes and phase difference of each phase voltage, respectively defining
θ1＝||θA|-|θB||，θ2＝||θB|-|θC||，θ3＝||θC|-θAL; comparison U1And theta1，U2And theta2，U3And theta3The relationship between: does not satisfy (U)1≤0∩U3≥0)∩(θ1≤90°∪θ3≤90°)，(U1≥0∩U2≤0)∩(θ1≤90°∪θ2≤90°)，(U2≥0∩U3≤0)∩(θ2≤90°∪θ3And (3) under any one of three conditions of less than or equal to 90 degrees), the upstream section of the detection point 1 is a sound section.
At this time k<And 4, automatically adding 1 to the value k, wherein k is 2, and the master station enters the next section, namely the section between the detection point 2 and the detection point 1 for judgment. Does not satisfy (U)1≤0∩U3≥0)∩(θ1≤90°∪θ3≤90°)，(U1≥0∩U2≤0)∩(θ1≤90°∪θ2≤90°)，(U2≥0∩U3≤0)∩(θ2≤90°∪θ3And (3) under any one of the three conditions of less than or equal to 90 degrees), the section between the detection point 2 and the detection point 1 is a healthy section.
At this time k<And 4, automatically adding 1 to the value k, wherein k is 3, and the master station enters the next section, namely the section between the detection point 3 and the detection point 2 for judgment. Does not satisfy (U)1≤0∩U3≥0)∩(θ1≤90°∪θ3≤90°)，(U1≥0∩U2≤0)∩(θ1≤90°∪θ2≤90°)，(U2≥0∩U3≤0)∩(θ2≤90°∪θ3The section between the detection point 3 and the detection point 2 is a sound section under any one of the three conditions of less than or equal to 90 degrees.
At this time k<And 4, automatically adding 1 to the value k, wherein k is 4, and the master station enters the next section, namely the section between the detection point 4 and the detection point 3 for judgment. As shown in figure 4 of the drawings,
and is
And
the phase angle of (A) is 120 degrees,
are respectively connected with
The phase angle of the two phases is approximately 60 °; the value can be obtained by sampling
Satisfy (U)1≤0∩U3≥0)∩(θ1≤90°∪θ390 deg.C or less) so that the broken line phase can be judged as phase A and the section between the detection point 4 and the detection point 3 is a fault section.
As shown in fig. 5, determining the faulty section further comprises the steps of:
s71, the master station reports the disconnection information to the display terminal;
s72, two adjacent detection point switches of the fault section are disconnected;
and S73, closing the communication switch.
The main station reports the disconnection information in various forms, for example, the disconnection information is wirelessly or in wired communication and displayed on the display terminal, the display terminal can be mobile communication equipment such as a mobile phone and a tablet, the operation and maintenance personnel can carry the disconnection information with the main station, so that the operation and maintenance personnel can be informed at the first time and can quickly and visually display the fault, and the detection point 3 and the detection point 4 can be automatically or manually instructed to open and close the contact switch at proper time, so that the fault isolation section can be maintained, and the power supply of the health section can not be influenced. When the fault is located in other sections, the fault is located in S3、S4Similar description is omitted.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (4)
1. A positioning method for a single-phase disconnection fault section of a distribution network ungrounded system is characterized by comprising the following steps:
s1, setting a plurality of detection points in the power line;
s2, marking the detection points, and sequentially marking the detection points as a first detection point, a second detection point, a third detection point and a last nth detection point from the bus outlet to the detection point in the direction of the tail end of the line;
s3, marking the first detection point as k, where k is 1;
s4, judging whether the k value is less than or equal to n, and if yes, sequentially calculating the amplitude difference and the phase difference of each phase voltage at the detection point k; defining the phase voltage at the detection point k as
The amplitude difference and the phase difference are respectively
θ1＝||θA|-|θB||，θ2＝||θB|-|θC||，θ3＝||θC|-|θAL; if the k value is not less than or equal to n, determining that the fault area section is a section from the detection point n to the line tail end, and directly switching to S7;
s5, comparing the U at the detection point k respectively1And theta1，U2And theta2，U3And theta3The relationship between; if it satisfies (U)1≤0∩U3≥0)∩(θ1≤90°∪θ3Not more than 90 degrees), the broken line phase can be judged as the A phase; if it satisfies (U)1≥0∩U2≤0)∩(θ1≤90°∪θ2Not more than 90 degrees), the broken line phase can be judged as the B phase; if it satisfies (U)2≥0∩U3≤0)∩(θ2≤90°∪θ3Not more than 90 degrees), the broken line phase can be judged as the C phase; if any of the above three conditions is satisfied, the process proceeds to S6; otherwise k is automatically added with 1, and the step S4 is continuously executed;
s6, judging that the fault section is a section between a detection point k and a detection point k-1;
and S7, finishing judgment and determining a fault section.
2. A method as claimed in claim 1, wherein information about the phase voltages is collected by a plurality of feeder terminals, a plurality of feeder terminals being provided at each of the detection points, the feeder terminals being connected to a main station via a communication system.
3. A method as claimed in claim 1, wherein information about the phase voltages is collected by a plurality of fault indicators, which are respectively arranged at the detection points, and the fault indicators are connected to the main station via a communication system.
4. The method for locating the single-phase disconnection fault section of the ungrounded system of the power distribution network according to claim 1, wherein the judging of the end and the determination of the fault section comprise the steps of:
the master station reports the disconnection information to the display terminal;
two adjacent detection point switches of the fault section are disconnected;
the tie switch is closed.
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| CN113484661A (en) * | 2021-05-26 | 2021-10-08 | 贵州电网有限责任公司 | 10kV distribution line single-phase line break fault direction detection method and system based on line voltage change information |
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| CN113484661A (en) * | 2021-05-26 | 2021-10-08 | 贵州电网有限责任公司 | 10kV distribution line single-phase line break fault direction detection method and system based on line voltage change information |
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Application publication date: 20210402 |