WO2023221431A1 - Système et procédé de recherche de défaut dans une ligne de distribution d'énergie - Google Patents

Système et procédé de recherche de défaut dans une ligne de distribution d'énergie Download PDF

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WO2023221431A1
WO2023221431A1 PCT/CN2022/132363 CN2022132363W WO2023221431A1 WO 2023221431 A1 WO2023221431 A1 WO 2023221431A1 CN 2022132363 W CN2022132363 W CN 2022132363W WO 2023221431 A1 WO2023221431 A1 WO 2023221431A1
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WIPO (PCT)
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phase
distribution line
sequence voltage
fault
zero
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PCT/CN2022/132363
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English (en)
Chinese (zh)
Inventor
刘红文
杨金东
陈虓
杨文呈
黄继盛
李凯恩
陈饶
罗文军
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云南电网有限责任公司临沧供电局
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Publication of WO2023221431A1 publication Critical patent/WO2023221431A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
    • 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

Definitions

  • the present application relates to the technical field of distribution network fault detection, and in particular to a distribution line fault finding system and method.
  • the power system can be divided into high current grounding system and small current grounding system according to the grounding treatment method.
  • small current grounding systems single-phase grounding is a common temporary fault, which often occurs in humid and rainy weather.
  • the faulted phase-to-ground voltage decreases and the phase voltages of the non-faulted two phases increase, but the line voltage remains symmetrical. Therefore, a single-phase ground fault does not affect the continuous power supply to users, and the system can operate for 1 to 2 hours.
  • the power system can still continue to provide power to users.
  • the voltage of the non-faulty two phases increases, which may cause the weak link of the insulation to be broken down.
  • a phase-to-phase short circuit develops, causing the accident to expand. It may also damage the equipment and undermine the safe operation of the system.
  • distribution automation and insulation meggers are usually used to locate faults.
  • distribution automation can only isolate faults within a certain distance and cannot give a specific fault point; an insulation megger is used to measure ground insulation, but due to capacity limitations, the fault point is difficult to find. Therefore, maintenance personnel often cannot find the fault point, which prolongs the troubleshooting time, resulting in low efficiency of troubleshooting.
  • This application provides a distribution line fault finding system and method to solve the problem of low efficiency in fault processing due to the failure to find the fault point and prolonging the fault processing time.
  • this application provides a distribution line fault finding system, including: a detection sensor, a robotic arm, a receiving device and a single-phase switch, wherein: the detection sensor is connected to the distribution line, and the detection sensor is used to detect all The zero-sequence voltage of the distribution line; the detection sensor includes a communication module, and the communication module is used to send the zero-sequence voltage; the single-phase switch is arranged on each phase wire of the distribution line, and the single-phase The switch is configured to open the single-phase switch when a fault occurs on the distribution line; the mechanical arm includes a start switch, a first terminal and a second terminal, and the start switch is connected to the first terminal.
  • the first terminal and the second terminal are connected in series, and the first terminal and the second terminal are used to short-circuit the single-phase switch;
  • the mechanical arm is configured to connect the third terminal when a fault occurs on the distribution line.
  • a terminal and the second terminal are short-circuited on both sides of the single-phase switch, and the starting switch is closed to generate the zero-sequence voltage;
  • the receiving device is communicatively connected to the communication module to receive the The zero sequence voltage sent by the communication module.
  • the zero sequence voltage in the line is obtained. By analyzing the zero sequence voltage, it can be determined whether there is a single-phase fault in the line. If there is a single-phase fault, the fault location is determined based on the zero-sequence voltage value, thereby improving the efficiency of fault handling.
  • the detection sensor is a three-phase sensor, each phase of the detection sensor is connected to the communication module, each phase of the detection sensor includes a coupling capacitor, the detection sensor includes a measurement impedance, and the coupling A capacitor is connected in series with the measurement impedance to detect the zero sequence voltage.
  • the zero sequence voltage is more accurately measured based on the measured impedance, improving the accuracy of the system.
  • the communication module is a signal transmitting antenna
  • the receiving device includes a signal receiving antenna.
  • the signal transmitting antenna and the signal receiving antenna are used to transmit the zero sequence voltage in the form of electromagnetic waves.
  • the zero-sequence voltage is transmitted in the form of electromagnetic waves, which is fast and does not require a medium.
  • the receiving device includes a receiving unit and a processing unit, and the receiving unit is communicatively connected with the communication module.
  • the processing unit is connected to the receiving unit, and the processing unit is configured to analyze the zero-sequence voltage to more conveniently process the zero-sequence voltage.
  • the processing unit is further configured to, if the zero-sequence voltage of one phase in the distribution line is not equal to the other two phases, obtain the position of the minimum value of the zero-sequence voltage in the phase, to Improve the accuracy of finding fault locations.
  • the system further includes an alarm unit, the alarm unit is connected in parallel with the single-phase switch, and the alarm unit is configured to send an alarm signal when a fault occurs on the distribution line. This ensures that when a fault occurs, maintenance personnel can be promptly reminded for maintenance.
  • the detection sensor is provided with an adapted waterproof housing.
  • the waterproof housing can prevent the detection sensor from being eroded by rainwater, thereby extending the service life of the detection sensor.
  • this application provides a distribution line fault finding method, including:
  • the single-phase switch When the distribution line fails, the single-phase switch is disconnected; connect the first terminal and the second terminal of the robotic arm to both sides of the single-phase switch for each phase of the distribution line, and close the starting switch so that
  • the lines of the distribution line generate zero sequence voltage; detect the zero sequence voltage through detection sensors; send the zero sequence voltage through the communication module; receive the zero sequence voltage through the receiving device to determine whether there is a single-phase fault; if there is In the case of a single-phase fault, the fault point location is determined based on the zero sequence voltage.
  • determining whether a single-phase fault exists includes: analyzing the zero-sequence voltage through a zero-sequence voltage function, where the zero-sequence voltage function is Among them, U If each phase in the distribution line If the values of are equal, there is no single-phase fault; if each phase in the distribution line If the values are not equal, there is a single-phase fault.
  • determining the location of the fault point includes: screening the distribution line with the other two phases.
  • the target phase whose values are not equal; obtain the position of the i-th detection sensor when the value of i in the target phase U X0i is the smallest.
  • the present application provides a distribution line fault finding system and method, which controls the opening and closing of the distribution line through the single-phase switch.
  • the single-phase switch is disconnected to protect the line safety.
  • the start switch is closed to generate a zero-sequence voltage in the distribution line.
  • One end of the detection sensor is connected to the distribution line and the other end is grounded. The detection sensor measures the zero sequence voltage and receives the zero sequence voltage through the receiving device. By analyzing the zero-sequence voltage values at different locations and different phases, it is determined whether there is a single-phase fault.
  • This application provides a distribution line fault finding system and method that can determine whether there is a single-phase fault in the line, and can find the location of the single-phase fault more accurately and quickly, thereby reducing fault processing time and improving fault processing efficiency. efficiency.
  • Figure 1 is a schematic structural diagram of a distribution line fault finding system of the present application
  • Figure 2 is a schematic structural diagram of a receiving device in an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of the alarm unit in the embodiment of the present application.
  • Figure 4 is an example diagram of a distribution line fault finding system method provided by an embodiment of the present application.
  • Figure 5 is a flow chart of a distribution line fault finding method in an embodiment of the present application.
  • Small current grounding system refers to a three-phase system in which the neutral point is not grounded or is grounded through an arc suppression coil and high impedance. It is also called a neutral point indirect grounding system. When a ground fault occurs in a certain phase, since a short circuit cannot be formed, the ground fault current is often much smaller than the load current, so this system is called a small current grounding system.
  • Single-phase grounding is a common temporary fault in low-current grounding systems.
  • Single-phase ground fault is the most common fault in power distribution system, which often occurs in humid and rainy weather. It is mainly caused by many factors such as tree obstacles, single-phase breakdown of insulators on distribution lines, single-phase wire breakage, and small animal hazards.
  • Single-phase grounding not only affects the user's normal power supply, but may also produce overvoltage, burn out equipment, or even cause a phase-to-phase short circuit to expand the accident. Therefore, how to quickly find the fault location and handle the fault in a timely manner is crucial.
  • Distribution automation refers to the comprehensive use of computer, information and communication technologies based on the primary grid and equipment of the distribution network, and through information integration with related application systems to achieve monitoring, control and rapid fault isolation of the distribution network. , providing real-time data support for the power distribution management system.
  • distribution automation can only isolate faults within a certain distance and cannot give specific fault points.
  • Insulation megger is a measuring instrument commonly used by electricians. It is mainly used to check the insulation resistance of electrical equipment, household appliances or electrical lines to ground and between phases.
  • the use of insulation meggers for ground insulation measurement is limited by capacity, making it difficult to find fault points. Therefore, maintenance personnel often cannot find the fault point, which prolongs the troubleshooting time, resulting in low efficiency of troubleshooting.
  • this application provides a distribution line fault finding system, see Figure 1 , including: a detection sensor 1, a robotic arm 2, a receiving device 3 and a single-phase switch 4.
  • the single-phase switch 4 is provided on each phase wire of the distribution line, and the single-phase switch 4 is used to control the on/off of the line.
  • One end of the detection sensor 1 is connected to the distribution line, and the other end is grounded, and is used to detect the zero sequence voltage of the distribution line.
  • the detection sensor 1 also includes a communication module 13 , which is communicatively connected with the receiving device 3 .
  • the communication module 13 is used to send zero sequence voltage to the receiving device 3 .
  • the robot arm 2 includes a start switch 23, a first terminal 21 and a second terminal 22.
  • the start switch 23 is connected in series with the first terminal 21 and the second terminal 22.
  • the start switch 23 is used to control the on and off of the robot arm 2 , and the first terminal 21 and the second terminal 22 are used to short-circuit the single-phase switch 4
  • the single-phase switch 4 is configured to open when a fault occurs in the distribution line. After the single-phase switch 4 on the distribution line is disconnected, the circuit of the distribution line is disconnected to protect the line. It should be noted that the distribution lines in the embodiments of this application are all three-phase high-voltage wires.
  • the single-phase switch 4 may be a single-phase sectional protection switch commonly installed on the line. Therefore, when the single-phase switch 4 is open, it means that a ground fault has occurred in the distribution line. At this time, the fault should be dealt with promptly.
  • the first terminal 21 and the second terminal 22 of the robot arm 2 are connected to both sides of the single-phase switch 4 . After confirming that the connection positions of the first terminal 21 and the second terminal 22 are correct, close the start switch 23 of the robot arm 2 . At this time, the robot arm 2 restores the power distribution line to the path state. It is equivalent to using the robotic arm 2 to continue to supply voltage to the line, so that the line of the distribution line generates zero sequence voltage. Since the detection sensor 1 is connected to the distribution line, the detection sensor 1 can detect the zero sequence voltage generated in the line at this time. After detecting the zero sequence voltage, the detection sensor 1 sends the zero sequence voltage to the receiving device 3 through the communication module 13 . Referring to FIG.
  • the receiving device 3 includes a receiving unit 31 and a processing unit 32 , and the receiving unit 31 and the processing unit 32 are connected.
  • the zero-sequence voltage is received through the receiving unit 31, and the zero-sequence voltage is analyzed through the processing unit 32 to determine whether there is a single-phase fault in the line. If there is a single-phase fault, the zero-sequence voltage is analyzed by the processing unit 32 to determine the location of the fault.
  • the communication module 13 uses a signal transmitting antenna
  • the receiving unit 31 uses a signal receiving antenna.
  • Antennas are an indispensable part of wireless transmission.
  • any signal that uses electromagnetic waves to propagate in the air requires various forms of antennas.
  • the signal transmitting antenna and the signal receiving antenna of this application can be selected according to the actual situation.
  • the signal transmitting antenna and the signal receiving antenna transmit zero-sequence voltage in the form of electromagnetic waves, which have the advantages of fast transmission and no need for media.
  • the signal transmitting antenna and the signal receiving antenna are small in size and occupy a small area, making the receiving device more portable.
  • the processing unit 32 is configured to obtain the position of the minimum value of the zero sequence voltage in one phase of the distribution line if the zero sequence voltage is not equal to the other two phases.
  • the three phases of the distribution line are phase A, phase B, and phase C.
  • the sum of the zero sequence voltage values measured by all detection sensors 1 on phase A is X
  • the zero sequence voltage measured by all detection sensors 1 on phase B is The sum of the sequence voltage values
  • the sum of the zero sequence voltage values measured by all detection sensors 1 on the C phase is Z
  • the value is the position of sensor 1, which is the position closest to the fault point. This allows the fault location to be determined more accurately during the fault finding process.
  • the system in order to promptly remind maintenance personnel that there is a single-phase fault in the line, the system also includes an alarm unit 5 , and the alarm unit 5 is connected in parallel with the single-phase switch 4 .
  • the alarm unit 5 is configured so that when a fault occurs, the alarm unit 5 can send out an alarm signal in time.
  • the alarm signal can take many forms.
  • the alarm unit 5 can use an acoustic alarm.
  • the acoustic alarm can play voice prompts or music prompts to remind maintenance personnel to deal with the fault in time; or
  • the alarm unit 5 can adopt a magnetic switch alarm, a vibration alarm, an ultrasonic alarm, etc. After receiving the alarm signal from the alarm unit 5, the maintenance personnel turn off the alarm unit 5 and perform troubleshooting work in a timely manner.
  • the detection sensor 1 is a three-phase sensor.
  • Each phase of the three-phase sensor includes a coupling capacitor 11 and a measurement impedance 12 .
  • Coupling capacitance also known as electric field coupling or electrostatic coupling, is a coupling method caused by the existence of distributed capacitance.
  • the coupling capacitor couples and isolates the two systems of strong current and weak current through the capacitor, provides a high-frequency signal path, prevents low-frequency current from entering the weak current system, and ensures personal safety.
  • the measurement impedance 12 can be either a resistance or an inductance. Suppose the impedance of the measured impedance 12 is Z, then Z is usually 0.01 ⁇ 0.0001 times. By measuring the impedance 12, the zero sequence voltage value in the line can be measured more accurately.
  • the detection sensor 1 is provided with an adapted waterproof housing. Since the detection sensor 1 is installed outdoors, it may be contaminated by rain, dew, etc., resulting in oxidation reaction and shortened service life. In order to prevent the detection sensor 1 from being corroded, the detection sensor 1 is provided with a waterproof shell to extend the service life of the detection sensor 1 .
  • a waterproof shell made of polycarbonate can be used, which has good waterproof performance, excellent electrical properties, and strong impact resistance.
  • FIG. 5 is a flow chart of a distribution line fault finding method in an embodiment of the present application.
  • This application also provides a distribution line fault finding method corresponding to the above system, as shown in Figure 5, including the following steps:
  • S200 Connect the first terminal 21 and the second terminal 22 to both sides of the single-phase switch 4 of each phase of the distribution line, and close the starting switch 23 so that the distribution line generates zero sequence voltage;
  • S400 Send the zero sequence voltage through the communication module 13;
  • S500 Receive the zero sequence voltage through the receiving device 3 to determine whether there is a single-phase fault
  • the single-phase switch 4 when a fault occurs in the line, the single-phase switch 4 is turned off to protect the safety of the line.
  • the path state of the line is restored.
  • the power supply will stimulate the fault location to generate zero sequence voltage.
  • the zero sequence voltage is measured by the detection sensor 1 connected to the distribution line, and the zero sequence voltage is sent to the receiving device 3 through the communication module 13 .
  • the receiving device 3 After receiving the zero-sequence voltage, the receiving device 3 can determine whether there is a single-phase ground fault by analyzing the zero-sequence voltages at different locations. If there is a single-phase ground fault, the fault location is determined by analyzing the zero sequence voltage.
  • determining whether a single-phase fault exists includes: analyzing the zero-sequence voltage through a zero-sequence voltage function, where the zero-sequence voltage function is Among them, U If each phase in the distribution line If the values of are equal, there is no single-phase fault; if each phase in the distribution line If the values are not equal, there is a single-phase fault.
  • determining the location of the fault point includes: screening the target phase in the distribution line that is not equal to the value of the other two phases; obtaining the position of the i-th detection sensor when the value of i is the smallest in the target phase .
  • FIG 4 is an example diagram of a distribution line fault finding method provided by an embodiment of the present application.
  • the single-phase switch 4 of the distribution line When the single-phase switch 4 of the distribution line is disconnected, connect the first terminal 21 and the second terminal 22 of the robot arm 2 in parallel to both ends of the A-phase single-phase switch 4, start the switch 23, and detect the sensor 1 to obtain the A-phase Zero-sequence voltage distribution U A0 ; then connect the first terminal 21 and the second terminal 22 of the robot arm 2 in parallel to both ends of the B-phase single-phase switch 4, start the switch 23, and detect the sensor 1 to obtain the B-phase zero-sequence voltage distribution U B0 ; then when the first terminal 21 and the second terminal 22 of the robot arm 2 are connected in parallel to both ends of the C-phase single-phase switch 4, the switch 23 is started, and the detection sensor 1 obtains the B-phase zero sequence voltage distribution U C0 .
  • the zero sequence voltage of each detection sensor 1 is U A0i , i is 1 to n; if there are n detection sensors 1 in phase B, the zero sequence voltage of each detection sensor 1 is U B0i , i ranges from 1 to n; if C phase U C0 has n detection sensors 1, the zero sequence voltage of each detection sensor 1 is U C0i , i ranges from 1 to n. but,
  • phase A zero sequence voltage sum function is
  • phase A, B, and C are all equal, that is then there is no single-phase ground fault on the line; if two of them are not equal Then phase B fails. At this time, the B-phase zero sequence voltage is analyzed.
  • U B0i is the minimum value
  • the value of i is used to obtain the position of the i-th sensor, that is, the position of the i-th sensor is the position closest to the fault point.
  • the present application provides a distribution line fault finding system and method, which controls the opening and closing of the distribution line through the single-phase switch 4 .
  • the single-phase switch 4 is turned off, and the alarm unit 5 simultaneously sends out an alarm signal.
  • the maintenance personnel connect the first terminal 21 and the second terminal 22 of the robot arm 2 to both sides of the single-phase switch 4 of each phase of the distribution line, and close the start switch 23 .
  • the robot arm 2 restores the path state of the line, causing the line to generate zero sequence voltage.
  • the detection sensor 1 measures the zero sequence voltage by connecting to the distribution line, and sends the zero sequence voltage to the receiving device 3 through the communication module 13 .
  • the receiving device 3 After receiving the zero-sequence voltage, the receiving device 3 determines whether a single-phase fault occurs by analyzing the magnitude of the zero-sequence voltage at different locations. If a single-phase fault occurs, the location of the fault can be determined based on the zero-sequence voltage value.
  • This application provides a distribution line fault finding system and method that can more accurately and quickly find the location of a single-phase fault, thereby reducing fault processing time and improving fault processing efficiency.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
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  • Theoretical Computer Science (AREA)
  • Locating Faults (AREA)

Abstract

La présente demande concerne un système et un procédé pour trouver un défaut dans une ligne de distribution d'énergie. Le système comprend un capteur de détection, un bras mécanique, un appareil de réception et un commutateur monophasé. Le commutateur monophasé est disposé sur chaque phase de fil électrique d'une ligne de distribution d'énergie, de façon à commander la mise en marche et l'arrêt de chaque phase de ligne de la ligne de distribution d'énergie. Lorsqu'un défaut se produit, le commutateur monophasé est éteint ; une première extrémité de câblage et une seconde extrémité de câblage du bras mécanique sont connectées à deux côtés du commutateur monophasé et un commutateur de démarrage du bras mécanique est allumé, de telle sorte que la ligne de la ligne de distribution d'énergie génère une tension de séquence nulle. Le capteur de détection est connecté à la ligne de distribution d'énergie, la tension de séquence nulle est mesurée au moyen du capteur de détection et la tension de séquence nulle est reçue au moyen de l'appareil de réception. Au moyen de l'analyse de tensions de séquence nulle à différentes positions, il est déterminé si un défaut de phase unique se produit et la position où se produit le défaut. Au moyen du système et du procédé pour trouver un défaut dans une ligne de distribution d'énergie, lesdits système et procédé étant fournis dans la présente invention, la position dans laquelle un défaut monophasé se produit peut être trouvée avec précision et rapidement, ce qui permet d'améliorer l'efficacité de traitement de défaut.
PCT/CN2022/132363 2022-05-17 2022-11-16 Système et procédé de recherche de défaut dans une ligne de distribution d'énergie WO2023221431A1 (fr)

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