CN113484660B - 10kV distribution line single-phase line break and ground crash fault identification method and system based on bus zero sequence voltage information - Google Patents

10kV distribution line single-phase line break and ground crash fault identification method and system based on bus zero sequence voltage information Download PDF

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CN113484660B
CN113484660B CN202110579702.XA CN202110579702A CN113484660B CN 113484660 B CN113484660 B CN 113484660B CN 202110579702 A CN202110579702 A CN 202110579702A CN 113484660 B CN113484660 B CN 113484660B
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bus
sequence voltage
fault
zero
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CN113484660A (en
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郑海涯
周斌
杨程
金贵红
封杰
周立波
吴育腾
周之华
王秀境
薛永瑞
谢松伟
陈梦琦
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Guizhou Power Grid Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

Abstract

The invention discloses a method for identifying a single-phase disconnection and ground falling fault of a 10kV distribution line based on bus zero-sequence voltage information, which is used for a neutral point ungrounded distribution system and mainly solves the problem that the single-phase disconnection and ground falling fault or the ungrounded fault is difficult to judge due to natural disasters such as lightning stroke, severe weather and the like or artificial damages such as construction, vehicle shuttling and the like of the distribution line, and the method comprises the following steps: determining that the single-phase line break fault occurs in the power distribution system and determining a fault phase by using an existing detection algorithm; the amplitude and phase information of the zero sequence voltage of the bus are measured in real time by using a three-phase five-column voltage transformer installed at the bus; the method is characterized in that the fault phase electromotive force is taken as a reference, whether the zero sequence voltage amplitude and the phase of a bus meet the criterion provided by the patent is judged, and therefore the fault is determined to be a single-line broken line and power supply side falling fault or a single-phase broken line and load side falling fault. The fault identification method is based on the power frequency component of the bus zero sequence voltage, has low sampling requirement, does not need to additionally increase a detection instrument, and has wide application range and strong practicability.

Description

10kV distribution line single-phase line break and ground crash fault identification method and system based on bus zero sequence voltage information
Technical Field
The invention relates to the technical field of power distribution network relay protection, in particular to a method and a system for identifying a single-phase broken line and ground falling fault of a 10kV power distribution line based on bus zero-sequence voltage information, which are suitable for a 10kV power distribution network with ungrounded neutral points and capable of measuring bus zero-sequence voltage amplitude and phase information in real time.
Background
In recent years, the distribution network structure is increasingly complex, the insulated wires of the distribution lines are more and more widely applied, and due to the fact that the insulated wires cannot dissipate heat in time, electric arcs generated after the wires encounter natural disasters such as lightning strike are difficult to extinguish automatically, the electric arcs can be continuously burnt at a certain point until the wires are fused, the wires are suspended in the air or fall to the ground, and disconnection and ground falling faults are generated. After the fault of wire breaking and falling to the ground occurs, people or livestock are close to the falling point, and potential safety hazards are easily caused by the step voltage. In summary, when a disconnection fault occurs in the system, in order to reduce potential safety hazards, it is very necessary to research a disconnection and ground crash fault identification method.
Generally, the single-phase wire breakage fault of the wire can be divided into three types, namely, a suspended type at a fracture, a power source side single-side falling type and a load side single-side falling type. In the field, for a single-phase line break and a ground fault thereof, the current mainstream protection method uses line voltage, phase voltage and zero sequence voltage information on the upstream and downstream of a fault position to perform fault phase selection and section positioning, but the methods cannot accurately identify the line break and ground fault or the line break and ground fault.
Disclosure of Invention
In view of the above, the first aspect of the present invention is to provide a method for identifying a single-phase disconnection and ground-drop fault of a 10kV distribution line based on bus zero-sequence voltage information, which is used to solve the problem that the prior art cannot determine whether a wire ground-drop fault occurs after the single-phase disconnection fault occurs in the distribution line.
The large purpose of the first aspect of the invention is realized by the following technical scheme:
a10 kV distribution line single-phase line breakage and ground falling fault identification method based on bus zero-sequence voltage information is used for a neutral point ungrounded distribution system, the method includes the steps of detecting bus zero-sequence voltage in real time, obtaining the amplitude and the phase of the bus steady-state zero-sequence voltage by taking the line breakage phase electromotive force as a reference, and then judging according to the amplitude and the phase of the bus steady-state zero-sequence voltage and combining detection criteria, so that whether a single-phase line breakage and power supply side ground falling fault or a single-phase line breakage and load side ground falling fault occurs is determined.
Further, the method comprises the steps of:
step S1: detecting the zero sequence voltage of the bus in real time, and obtaining the amplitude value of the steady-state zero sequence voltage of the bus as | U | and the phase as theta by taking the line-break phase electromotive force as a reference;
step S2: if the amplitude and the phase of the steady-state zero-sequence voltage of the bus meet the detection criterion 1, the single-phase line break and the power supply side ground crash fault are considered to occur, and the detection criterion 1 is as follows:
Figure BDA0003085589300000021
step S3: if the amplitude and the phase of the steady-state zero-sequence voltage of the bus meet the detection criterion 2, the single-phase line break and the load side ground crash fault are considered to occur, and the detection criterion 2 is as follows:
Figure BDA0003085589300000022
the invention aims at providing a 10kV distribution line single-phase line-breaking and ground-falling fault identification system based on bus zero-sequence voltage information, which comprises
The real-time detection unit is used for detecting the zero sequence voltage of the bus in real time and obtaining the amplitude and the phase of the steady-state zero sequence voltage of the bus by taking the line break phase electromotive force as a reference;
and the judging unit is used for comparing the obtained amplitude and phase of the bus steady-state zero sequence voltage with the detection criterion to determine whether the single-phase line break and power supply side falling fault or the single-phase line break and load side falling fault occurs.
Further, the amplitude of the steady-state zero-sequence voltage of the bus is | U |, and the phase is theta.
Further, the judging unit comprises a first judging module and a second judging module, the first judging module takes the detection criterion 1 as an embedded software module, if the amplitude and the phase of the bus steady-state zero-sequence voltage meet the detection criterion 1, the single-phase line break and the power supply side ground crash fault are considered to occur, and the formula of the detection criterion 1 is as follows:
Figure BDA0003085589300000023
further, the second judgment module takes the detection criterion 2 as an embedded software module, if the amplitude and the phase of the bus steady-state zero-sequence voltage meet the detection criterion 2, the single-phase line break and load side ground crash fault is considered to occur, and the formula of the detection criterion 2 is as follows:
Figure BDA0003085589300000024
it is an object of a third aspect of the present invention to provide a computer apparatus comprising a memory, a processor and a computer program stored on the memory and capable of running on the processor, the processor implementing the method as described above when executing the computer program: and judging by combining a built-in detection criterion according to the amplitude and the phase of the input bus steady-state zero sequence voltage to determine whether the single-phase line break and power supply side falling fault or the single-phase line break and load side falling fault occurs.
It is a further object of the present invention to provide a computer readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, is adapted to carry out the method of: and judging by combining a built-in detection criterion according to the amplitude and the phase of the input bus steady-state zero sequence voltage to determine whether the single-phase line break and power supply side falling fault or the single-phase line break and load side falling fault occurs.
The beneficial effects of the invention are:
when a single-phase line break fault occurs in a distribution line, the existing detection technology cannot judge whether a ground fault occurs, the zero-sequence voltage amplitude and the phase information of a bus are compared with preset criteria, so that whether a line break power supply side ground fault or a line break load side ground fault occurs is judged, no additional detection instrument is needed, the sampling requirement is low, the application range is wide, and the practicability is high.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the present invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 shows a zero-sequence voltage deviation range of a single-phase line break and power source side-falling ground fault bus;
FIG. 2 is a zero sequence voltage deviation range of a single-phase line break and load side-falling fault bus;
FIG. 3 is a flow chart of a single-phase disconnection and ground fall fault identification method;
fig. 4 is a schematic diagram of a single-phase disconnection and ground falling fault of a distribution network line provided by an embodiment of the invention;
FIG. 5 is a waveform diagram of the zero sequence voltage and the A-phase electromotive force of the bus when K1 is closed and K2 is opened according to the embodiment of the present invention;
FIG. 6 is a waveform diagram of the zero sequence voltage and the A-phase electromotive force of the bus when K1 is opened and K2 is closed according to the embodiment of the present invention;
fig. 7 is a waveform diagram of the bus zero sequence voltage and the a-phase electromotive force when the K1 is disconnected and the K2 is disconnected according to the embodiment of the present invention.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
The method is used for a neutral point ungrounded power distribution system, detects the zero sequence voltage of the bus in real time, obtains the amplitude and the phase of the steady zero sequence voltage of the bus by taking the line break phase electromotive force as the reference, and then judges according to the amplitude and the phase of the steady zero sequence voltage of the bus and by combining detection criteria, thereby determining whether the single-phase line break and power supply side falling fault or the single-phase line break and load side falling fault occurs.
Specifically, the method comprises the following steps:
step S1: detecting the zero sequence voltage of the bus in real time, and obtaining the amplitude value of the steady-state zero sequence voltage of the bus as | U | and the phase as theta by taking the line-break phase electromotive force as a reference;
step S2: if the amplitude and the phase of the steady-state zero-sequence voltage of the bus meet the detection criterion 1, the single-phase line break and the power supply side ground crash fault are considered to occur, and the detection criterion 1 is as follows:
Figure BDA0003085589300000041
step S3: if the amplitude and the phase of the steady-state zero-sequence voltage of the bus meet the detection criterion 2, the single-phase line break and the load side ground crash fault are considered to occur, and the detection criterion 2 is as follows:
Figure BDA0003085589300000042
based on the design idea of the method, the invention also discloses a 10kV distribution line single-phase line break and ground crash fault identification system based on the bus zero sequence voltage information, and the system comprises
A real-time detection unit: the system is used for detecting the zero sequence voltage of the bus in real time and obtaining the amplitude and the phase of the steady-state zero sequence voltage of the bus by taking the line-break phase electromotive force as a reference; in this embodiment, the amplitude of the bus steady-state zero-sequence voltage is | U |, and the phase is θ.
A judging unit: and comparing the amplitude and the phase of the obtained bus steady-state zero-sequence voltage with a detection criterion to determine whether a single-phase line break and power supply side falling fault or a single-phase line break and load side falling fault occurs.
Specifically, the judging unit comprises a first judging module and a second judging module, the first judging module takes a detection criterion 1 as an embedded software module, if the amplitude and the phase of the steady-state zero-sequence voltage of the bus meet the detection criterion 1, the single-phase disconnection and power supply side ground crash fault is considered to occur, and the formula of the detection criterion 1 is as follows:
Figure BDA0003085589300000043
the second judgment module takes the detection criterion 2 as an embedded software module, if the amplitude and the phase of the steady-state zero-sequence voltage of the bus meet the detection criterion 2, the single-phase line break and load side-falling fault is considered to occur, and the formula of the detection criterion 2 is as follows:
Figure BDA0003085589300000044
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Fig. 3 to 7 are drawings of examples of the present invention, and the present invention will be further described with reference to fig. 3 to 7: fig. 4 shows a 10kV distribution and disconnection and ground falling fault detection system matched with the present invention, the detection system comprises: the system comprises zero sequence voltage detection equipment (in the embodiment, a three-phase five-column voltage transformer), a main station and a communication system, wherein the zero sequence voltage detection equipment is arranged at a bus. The detection equipment is in communication with the main station through a communication system, the voltage transformer transmits the detected zero sequence voltage information to the main station for processing, and the main station judges.
The switches K1 and K2 control fault types, the faults that K1 and K2 are both disconnected are disconnection and non-grounding faults, K1 is closed, K2 is disconnection power supply side falling fault, K1 is disconnected, K2 is disconnected is disconnection load side falling fault, the system has 6 outgoing lines which are L1-L6, the outgoing line lengths are 3km, 6km, 9km, 12km, 15km, 18km and A phase disconnection, a fault point F is arranged on an L6 line, and the fault position is 10km away from a bus. The relevant parameters of the overhead line of the system are set as follows: z1＝(0.17+j0.38)Ω/km，b1＝(j3.045)us/km，Z0＝(0.23+j1.72)Ω/km，b0J1.884 us/km. The load of the fault line adopts a triangular connection mode, the load impedance unbalance degree is about 10 percent, and is set as | ZAB|＝220Ω，|ZAC|＝200Ω，|ZBCThe system is utilized to verify the effectiveness of the method of the invention, namely 200 omega.
The process of the embodiment of the invention is explained by combining the attached drawings 3-4, and assuming that K1 is closed and K2 is open in the system of the attached drawing 3, the fault type is a side-falling ground fault of a disconnection power supply, and the ground resistance is 100 Ω, taking this as an example, the specific implementation steps are as follows:
step S1: when the process begins, a main station of the detection system collects amplitude and phase information of bus zero-sequence voltage detected by a detection point, records that the peak value of the bus zero-sequence voltage is | U |, and the phase is theta;
step S2: the main station of the detection system judges the fault type according to the collected information, if the | U | and the theta satisfy a detection criterion 1, the single-phase disconnection and power supply side falling fault is considered to occur, if the | U | and the theta satisfy a detection criterion 2, the single-phase disconnection and load side falling fault is considered to occur, and the detection criterion 1 is as follows:
Figure BDA0003085589300000051
the detection criterion 2 is:
Figure BDA0003085589300000052
if the detection criteria 1 and 2 are not met, the step 1 is returned to for circular detection, in the example, through system simulation sampling, the bus zero-sequence voltage amplitude value | U | ═ 8415V, and θ ═ 178.38 °, and through judgment, the system is considered to have a single-phase line break and power supply side falling fault.
Changing the switching state in the system shown in fig. 3, opening K1 and closing K2, wherein the fault type is a line-breaking load side falling fault, and through system simulation sampling, the bus zero-sequence voltage amplitude | U | ═ 6065V, θ ═ 57.24 °, and after the judgment that the detection criterion 2 is met, the system is considered to have a single-phase line-breaking and load side falling fault.
Changing the switching state in the system shown in fig. 3, switching off K1 and switching off K2, wherein the fault type is a disconnection-grounding fault, and through system simulation sampling, the bus zero-sequence voltage amplitude | U | ═ 552V, θ ═ 21.42 °, and through judgment, the single-phase disconnection-grounding fault is not generated in the system if the detection criteria 1 and 2 are not met, the main station of the detection system circularly collects the bus zero-sequence voltage amplitude and phase information, and the detection criteria are repeatedly determined;
the method is used for identifying the single-phase disconnection and ground falling fault by utilizing the zero-sequence voltage amplitude and the phase information of the bus after the single-phase disconnection fault occurs. The method mainly solves the problem that whether the wire falls down to the ground or not can not be judged after the single-phase wire break fault occurs in the distribution line, the existing bus zero-sequence voltage measuring device of the transformer substation is utilized to detect the amplitude value and the phase information of the bus zero-sequence voltage in real time, the existing protection method is utilized to judge that the single-phase wire break fault occurs in the distribution line and the fault phase is correctly identified, and the method is suitable for a neutral point ungrounded distribution system, does not need to additionally increase a detecting instrument, has low sampling requirement, wide application range and strong practicability, and is a good supplement to the existing protection method.
It should be recognized that embodiments of the present invention can be realized and implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, according to the methods and figures described in the detailed description. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, the operations of processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or combinations thereof. The computer program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable interface, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the storage medium or device, is operative to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described herein includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (5)

1. A10 kV distribution line single-phase line break and ground fall fault identification method based on bus zero sequence voltage information is characterized by comprising the following steps: the method is used for a neutral point ungrounded distribution system, the method comprises the steps of detecting bus zero-sequence voltage in real time, obtaining the amplitude and the phase of the bus steady-state zero-sequence voltage by taking the line break phase electromotive force as a reference, and then judging by combining detection criteria according to the amplitude and the phase of the bus steady-state zero-sequence voltage so as to determine whether a single-phase line break and power supply side falling fault or a single-phase line break and load side falling fault occurs;
the method comprises the following steps:
step S1: detecting the zero sequence voltage of the bus in real time, and obtaining the amplitude value of the steady-state zero sequence voltage of the bus as | U | and the phase as theta by taking the line-break phase electromotive force as a reference;
step S2: if the amplitude and the phase of the steady-state zero-sequence voltage of the bus meet the detection criterion 1, the single-phase line break and the power supply side ground crash fault are considered to occur, and the detection criterion 1 is as follows:
Figure FDA0003572865360000011
step S3: if the amplitude and the phase of the steady-state zero-sequence voltage of the bus meet the detection criterion 2, the single-phase line break and the load side ground crash fault are considered to occur, and the detection criterion 2 is as follows:
Figure FDA0003572865360000012
2. the utility model provides a 10kV distribution lines single-phase broken string crash fault identification system based on generating line zero sequence voltage information which characterized in that: the system comprises
The real-time detection unit is used for detecting the zero sequence voltage of the bus in real time and obtaining the amplitude and the phase of the steady-state zero sequence voltage of the bus by taking the line break phase electromotive force as a reference;
the judging unit is used for comparing the obtained amplitude and phase of the bus steady-state zero-sequence voltage with a detection criterion to determine whether a single-phase line break and power supply side falling fault or a single-phase line break and load side falling fault occurs;
the judging unit comprises a first judging module and a second judging module, the first judging module takes a detection criterion 1 as an embedded software module, if the amplitude and the phase of the steady-state zero-sequence voltage of the bus meet the detection criterion 1, the single-phase disconnection and power supply side ground crash fault is considered to occur, and the formula of the detection criterion 1 is as follows:
Figure FDA0003572865360000013
the second judgment module takes the detection criterion 2 as an embedded software module, if the amplitude and the phase of the steady-state zero-sequence voltage of the bus meet the detection criterion 2, the single-phase line break and load side-falling fault is considered to occur, and the formula of the detection criterion 2 is as follows:
Figure FDA0003572865360000021
3. the system for identifying the single-phase disconnection and ground crash fault of the 10kV distribution line based on the bus zero-sequence voltage information according to claim 2, is characterized in that: the amplitude of the zero sequence voltage at the stable state of the bus is | U |, and the phase is theta.
4. A computer apparatus comprising a memory, a processor, and a computer program stored on the memory and capable of running on the processor, wherein: the processor implements the method for identifying the single-phase disconnection and ground crash fault of the 10kV distribution line based on the zero-sequence voltage information of the bus as claimed in claim 1 when executing the computer program.
5. A computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program is executed by a processor to realize the single-phase broken line and ground crash fault identification method of the 10kV distribution line based on the bus zero-sequence voltage information as claimed in claim 1.
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