CN112485596A - Power distribution network ground fault detection device and method - Google Patents
Power distribution network ground fault detection device and method Download PDFInfo
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- CN112485596A CN112485596A CN202011378203.6A CN202011378203A CN112485596A CN 112485596 A CN112485596 A CN 112485596A CN 202011378203 A CN202011378203 A CN 202011378203A CN 112485596 A CN112485596 A CN 112485596A
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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
- G01R31/086—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
- 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
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- 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
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
本申请提供一种配电网接地故障检测装置及方法，其中，所述配电网接地故障检测装置包括三相耦合电容、三相谐振电感和信号发射天线；所述三相耦合电容的输入端分别对应电连接高压母线，所述三相谐振电感输入端分别对应电连接所述三相耦合电容的输出端；所述三相谐振电感的输出端分别接地；所述信号发射天线的输入端电连接所述三相谐振电感输入端。采用上述装置，可提高瞬时故障和故障电流微弱等情况下故障检测的准确度，且本装置结构简单，操作方便，不受线路和空间的限制，有利于故障的快速清除，避免不必要的线路停电，提高供电可靠性。
The present application provides a ground fault detection device and method for a distribution network, wherein the distribution network ground fault detection device includes a three-phase coupling capacitor, a three-phase resonant inductor and a signal transmitting antenna; the input end of the three-phase coupling capacitor They are respectively electrically connected to the high-voltage busbars, and the input ends of the three-phase resonant inductors are respectively electrically connected to the output ends of the three-phase coupling capacitors; the output ends of the three-phase resonant inductors are respectively grounded; the input ends of the signal transmitting antenna are electrically connected Connect to the input end of the three-phase resonant inductor. The above-mentioned device can improve the accuracy of fault detection under the condition of instantaneous fault and weak fault current, and the device has a simple structure, is easy to operate, and is not limited by lines and space, which is conducive to the rapid removal of faults and avoids unnecessary lines. Power outages, improve power supply reliability.
Description
Technical Field
The application relates to the technical field of power distribution network line fault detection, in particular to a power distribution network ground fault detection device and method.
Background
Electric energy is used as a clean and efficient secondary energy, is closely related to national economic construction and daily life of people, and an electric power system for collecting electric energy production, transmission, distribution and consumption is of great importance to various industries as a support industry of the national civilians. With the progress of modern society, the rapid development of economy and the sudden increase of electric loads, higher and higher requirements on the reliability, stability, safety and quality of a power system are put forward.
The medium voltage distribution network below 35kV in China generally adopts a running mode of non-effective grounding of a neutral point. The operation mode has the advantages that after single-phase grounding fault occurs, three-phase load current and line voltage still keep symmetry and cannot be tripped immediately, fault operation can be carried out for a period of time, and particularly when the neutral point is grounded through the arc suppression coil, instantaneous single-phase grounding fault can be automatically eliminated, so that power failure accidents are reduced, and power supply reliability is improved. It should be noted that the non-faulted phase voltage will rise to normal after fault
And in case of long-term fault operation, the system overvoltage can damage the phase-to-phase insulation, so that more serious phase-to-phase fault is caused. Therefore, after the system has a single-phase earth fault, the fault should be detected in time, so that the fault section is cut off, and the condition that the fault is expanded and the power supply of the non-fault section is influenced is avoided.
Usually, a pulling method is adopted to determine a single-phase ground fault line and then manually patrol and search a fault point, even if a transformer substation is provided with a low-current ground line selection device, due to poor reliability of the device, an operator does not completely believe a line selection result, and the fault line is still identified by adopting the manual pulling method most of the time. Therefore, unnecessary short-time power failure of a sound line is caused, the workload of manually patrolling and searching a fault point after a fault line is selected is very heavy, the fault is not easily cleared quickly, the power failure time is prolonged, and the power supply reliability is reduced.
Disclosure of Invention
The application provides a distribution network ground fault detection device and method to solve among the prior art sound circuit unnecessary short-time power failure, it is also very heavy to select the work load that artifical patrolling line looked for the fault point behind the fault line simultaneously, is unfavorable for the quick clearance of trouble, has increased the power off time, has reduced the problem of power supply reliability.
In a first aspect, the present application provides a distribution network ground fault detection device, including: the three-phase coupling capacitor, the three-phase resonance inductor and the signal transmitting antenna;
the input ends of the three-phase coupling capacitors are respectively and correspondingly electrically connected with the high-voltage bus, and the input ends of the three-phase resonance inductors are respectively and correspondingly electrically connected with the output ends of the three-phase coupling capacitors;
the output ends of the three-phase resonant inductors are respectively grounded;
the input end of the signal transmitting antenna is electrically connected with the input end of the three-phase resonant inductor.
Optionally, the capacitance value of the three-phase coupling capacitor is 20pF to 2 nF.
Optionally, the inductance value of the three-phase resonant inductor is 13nH to 0.2 mH.
Optionally, the signal transmitting antenna transmits broadband signals with electromagnetic waves of 10kHz to 20MHz in frequency.
Optionally, the signal transmitted by the signal transmitting antenna is an active signal.
In a second aspect, the present application provides a method for detecting a ground fault of a power distribution network, including:
acquiring single-phase earth fault signal frequency;
calculating the capacitance value of the single-phase coupling capacitor;
and calculating the inductance value of the single-phase resonance inductor according to the single-phase earth fault signal frequency and the capacitance value of the single-phase coupling capacitor.
Optionally, the calculating the capacitance value of the single-phase coupling capacitor includes:
calculating the capacitance value of the single-phase coupling capacitor according to the following formula:
c is the capacitance value of the single-phase coupling capacitor, I is the human body free current, f is the power frequency of the circuit, and U is the rated line voltage of the circuit.
Optionally, the calculating an inductance value of the single-phase resonant inductor according to the single-phase ground fault signal frequency and the capacitance value of the single-phase coupling capacitor includes:
the inductance value of the single-phase resonance inductor is calculated according to the following formula:
wherein L is the inductance of the single-phase resonance inductor, f1The single-phase earth fault signal frequency is represented by C, and the capacitance value of the single-phase coupling capacitor is represented by C.
The application provides a distribution network ground fault detection device and a method, wherein the distribution network ground fault detection device comprises a three-phase coupling capacitor, a three-phase resonance inductor and a signal transmitting antenna; the input ends of the three-phase coupling capacitors are respectively and correspondingly electrically connected with the high-voltage bus, and the input ends of the three-phase resonance inductors are respectively and correspondingly electrically connected with the output ends of the three-phase coupling capacitors; the output ends of the three-phase resonant inductors are respectively grounded; the input end of the signal transmitting antenna is electrically connected with the input end of the three-phase resonant inductor. By adopting the device, the accuracy of fault detection under the conditions of instantaneous fault, weak fault current and the like can be improved, and the device is simple in structure, convenient to operate, free of limitation of lines and spaces, beneficial to quick clearing of faults, capable of avoiding unnecessary line power failure and capable of improving power supply reliability.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power distribution network ground fault detection apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a power distribution network ground fault detection apparatus according to an embodiment of the present disclosure;
fig. 3 is a schematic flow chart of a power distribution network ground fault detection method according to an embodiment of the present application.
The antenna comprises a 1-three-phase coupling capacitor, a 2-three-phase resonance inductor and a 3-signal transmitting antenna.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In a first aspect of the present application, referring to fig. 1, fig. 1 is a schematic structural diagram of a power distribution network ground fault detection apparatus provided in an embodiment of the present application, where the present application provides a power distribution network ground fault detection apparatus, where the power distribution network ground fault detection apparatus includes: three-phase coupling capacitor 1, three-phase resonance inductance 2 and signal transmitting antenna 3.
The input ends of the three-phase coupling capacitors 1 are respectively and correspondingly electrically connected with the high-voltage bus, and the input ends of the three-phase resonance inductors 2 are respectively and correspondingly electrically connected with the output ends of the three-phase coupling capacitors 1.
And the output ends of the three-phase resonant inductors 2 are respectively grounded.
The input end of the signal transmitting antenna 3 is electrically connected with the input end of the three-phase resonant inductor 2.
The three-phase coupling capacitor 1 comprises a first coupling capacitor C1A second coupling capacitor C2A third coupling capacitor C3Said first coupling capacitor C1A second coupling capacitor C2A third coupling capacitor C3The input ends of the high-voltage bus are respectively and correspondingly electrically connected with the high-voltage bus; the three-phase resonant inductor 2 comprises a first resonant inductor L1A second resonant inductor L2A third resonant inductor L3Said first resonant inductor L1A second resonant inductor L2A third resonant inductor L3Are respectively and correspondingly electrically connected with the first coupling capacitor C1A second coupling capacitor C2A third coupling capacitor C3An output terminal of (a); the above-mentioned devices form a series resonant circuit for amplifying a fault pulse signal. The first resonant inductor L1A second resonant inductor L2A third resonant inductor L3The output ends of the two-way valve are all grounded; the signal transmitting antenna 3 is respectively connected with the first resonant inductors L1A second resonant inductor L2A third resonant inductor L3The input ends of the two-way transmission line are connected in series and are arranged outside the protective box body and used for transmitting fault pulse signals in an electromagnetic wave mode.
The capacitance value of the three-phase coupling capacitor 1 is 20 pF-2 nF. The inductance value of the three-phase resonance inductor 2 is 13 nH-0.2 mH.
The inductance value of the three-phase resonant inductor 2 is calculated by the series resonance of the three-phase coupling capacitor 1 and the three-phase resonant inductor 2, referring to fig. 2, fig. 2 is another schematic structural diagram of a power distribution network ground fault detection apparatus provided in this embodiment of the present application, and the three-phase resonant inductor 2 may be combined into an inductor, and its inductance value is 1/3 of the three-phase resonant inductance value, that is, the inductance value is 1/3
Wherein L is an inductor obtained by combining the three-phase resonant inductors 2.
The signal transmitting antenna 3 transmits broadband signals with the frequency of electromagnetic waves of 10 kHz-20 MHz. The signal transmitted by the signal transmitting antenna 3 is an active signal.
The signal transmitting antenna 3 should be installed in an unobstructed open space, and the signal transmitting antenna 3 can amplify signals in an active manner, thereby increasing the signal transmission distance.
In a second aspect of the present application, referring to fig. 3, fig. 3 is a schematic flowchart of a method for detecting a ground fault of a power distribution network according to an embodiment of the present application. The application provides a power distribution network ground fault detection method, which comprises the following steps:
step S10, a single-phase ground fault signal frequency is acquired.
In step S20, the capacitance value of the single-phase coupling capacitor is calculated.
And step S30, calculating the inductance value of the single-phase resonance inductor according to the single-phase ground fault signal frequency and the capacitance value of the single-phase coupling capacitor.
Optionally, the calculating the capacitance value of the single-phase coupling capacitor includes:
calculating the capacitance value of the single-phase coupling capacitor according to the following formula:
c is the capacitance value of the single-phase coupling capacitor, I is the human body free current, f is the power frequency of the circuit, and U is the rated line voltage of the circuit. The power frequency in China is 50Hz, U is the rated line voltage of the line of 10kV, the maximum value of the leakage current of the line does not exceed the free current I of the human body to 10mA, and C is calculated to be 5 nF.
Optionally, the calculating an inductance value of the single-phase resonant inductor according to the single-phase ground fault signal frequency and the capacitance value of the single-phase coupling capacitor includes:
the inductance value of the single-phase resonance inductor is calculated according to the following formula:
wherein L is single-phase harmonicInductance value of the vibrating inductor, f1The single-phase earth fault signal frequency is represented by C, and the capacitance value of the single-phase coupling capacitor is represented by C. If the center frequency f of the fault pulse signal11MHz, according to the center frequency f of fault pulse signal1And a capacitance value C of the coupling capacitor, determining an inductance value
The application provides a distribution network ground fault detection device and a method, wherein the distribution network ground fault detection device comprises a three-phase coupling capacitor 1, a three-phase resonant inductor 2 and a signal transmitting antenna 3; the input ends of the three-phase coupling capacitors 1 are respectively and correspondingly electrically connected with a high-voltage bus, and the input ends of the three-phase resonance inductors 2 are respectively and correspondingly electrically connected with the output ends of the three-phase coupling capacitors 1; the output ends of the three-phase resonant inductors 2 are respectively grounded; the input end of the signal transmitting antenna 3 is electrically connected with the input end of the three-phase resonant inductor 2. By adopting the device, the accuracy of fault detection under the conditions of instantaneous fault, weak fault current and the like can be improved, and the device is simple in structure, convenient to operate, free of limitation of lines and spaces, beneficial to quick clearing of faults, capable of avoiding unnecessary line power failure and capable of improving power supply reliability.
This application utilizes the series resonance circuit that three-phase coupling capacitance and three-phase resonance inductance constitute to enlarge trouble pulse signal, then utilizes the signal transmission antenna to launch the trouble pulse signal after will enlargiing with the electromagnetic wave mode, can be outside hectometer or distance detection equipment trouble in a few centimeters, very big increase detection distance need not the detection personnel and closely detect, improves the rate of accuracy of line fault detection efficiency and fault location.
The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.
Claims (8)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114814465A (en) * | 2022-05-17 | 2022-07-29 | 云南电网有限责任公司临沧供电局 | Distribution line fault finding system and method |
| CN114814464A (en) * | 2022-05-17 | 2022-07-29 | 云南电网有限责任公司临沧供电局 | Three-phase circuit fault finding system and method |
| CN114859177A (en) * | 2022-05-17 | 2022-08-05 | 云南电网有限责任公司临沧供电局 | A kind of fault finding system and method based on split-phase switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114814465A (en) * | 2022-05-17 | 2022-07-29 | 云南电网有限责任公司临沧供电局 | Distribution line fault finding system and method |
| CN114814464A (en) * | 2022-05-17 | 2022-07-29 | 云南电网有限责任公司临沧供电局 | Three-phase circuit fault finding system and method |
| CN114859177A (en) * | 2022-05-17 | 2022-08-05 | 云南电网有限责任公司临沧供电局 | A kind of fault finding system and method based on split-phase switch |
| WO2023221432A1 (en) * | 2022-05-17 | 2023-11-23 | 云南电网有限责任公司临沧供电局 | Fault finding system and method for three-phase circuit |
| CN114814465B (en) * | 2022-05-17 | 2024-02-13 | 云南电网有限责任公司临沧供电局 | Distribution line fault finding system and method |
| CN114814464B (en) * | 2022-05-17 | 2024-06-14 | 云南电网有限责任公司临沧供电局 | Three-phase circuit fault finding system and method |
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| CN112485596B (en) | 2022-06-07 |
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