CN114814464A - Three-phase circuit fault finding system and method - Google Patents
Three-phase circuit fault finding system and method Download PDFInfo
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- 230000007935 neutral effect Effects 0.000 claims description 4
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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
- G01R31/50—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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Abstract
The application discloses three-phase circuit fault finding system and method, the system includes: a pulse detection sensor configured to detect a fault pulse signal and transmit the fault pulse signal in the form of an electromagnetic wave. And the switch is configured to control the three-phase circuit to be switched on and off. And the active compensation device is configured to start when a single-phase earth fault occurs in the line, and supply power to the fault phase. And the wiring arm is configured to be automatically connected to two sides of the switch of the fault phase when a single-phase earth fault occurs to the line. A signal receiving device configured to receive the electromagnetic wave signal emitted by the pulse detection sensor. The active compensation device is arranged in the system to simulate the working voltage of the fault phase, so that the fault pulse signal generated by the fault point location is closer to the actual working condition, the fault point location is quickly positioned, and the fault point location accuracy of the single-phase earth fault is improved.
Description
Technical Field
The application relates to the field of power distribution network fault detection, in particular to a three-phase circuit fault searching system and method.
Background
The common neutral point grounding mode in the power distribution network comprises the following steps: a large current grounding mode and a small current grounding mode. In a power distribution network, a single-phase earth fault is a common fault, and a system adopting a low-current earth mode can still operate for 1-2 hours when the single-phase earth fault occurs, so that the continuity of power supply is ensured, and the low-current earth mode is widely applied.
However, the operating environment of the power distribution network is complex, hidden dangers of tree lines and foreign matters are prominent, and a large number of insulation weak points exist, so that if fault troubleshooting is not timely performed on a system adopting a low-current grounding mode, the operating time of the system is too long, and the phase voltage of a non-fault phase is too high, the insulation weak points can be broken down, a single-phase grounding fault is developed to an interphase short-circuit fault, and an electric power safety accident is caused. Therefore, the power distribution network fault technology is researched to quickly locate fault occurrence points, and the power distribution network fault locating method has great significance for safe and reliable operation of the power distribution network.
In order to ensure the safe operation of the power distribution network, common fault finding methods include an impedance method, an alternating current-direct current comprehensive injection method, a traveling wave method, a zero sequence current method and the like. However, the impedance method and the traveling wave method are not suitable for the power distribution network with a complex structure; the AC-DC integrated injection method has the problems of high cost and poor searching capability; the zero sequence current method has instability for transient signal acquisition, resulting in inaccurate fault location. In a word, the problem of low accuracy exists in the fault point positioning of the single-phase earth fault in the low-current earthing mode.
Disclosure of Invention
The application provides a three-phase circuit fault finding system and a three-phase circuit fault finding method, which aim to solve the problem of low accuracy in positioning of a fault point of a single-phase earth fault in a low-current earth mode.
According to a first aspect of embodiments of the present invention, there is provided a three-phase circuit fault finding system, the system comprising: pulse detection sensor, switch, active compensation arrangement, wiring arm and signal receiver, wherein: one end of the pulse detection sensor is connected with the three-phase circuit, and the other end of the pulse detection sensor is grounded; the switch is connected to the initial end of each phase cable of the three-phase circuit and is configured to control the three-phase circuit to be switched on and off; one end of the active compensation device is connected with a neutral point of the three-phase circuit, and the other end of the active compensation device is grounded; the wiring arm is configured to be automatically connected to two sides of the switch of a fault phase when a single-phase earth fault occurs to a line; the signal receiving device is wirelessly connected with the pulse detection sensor and is configured to receive electromagnetic wave signals emitted by the pulse detection sensor. When a single-phase earth fault occurs, the fault phase can be switched on through the short-circuit switch of the wiring arm, and the active compensation device supplies power to the fault phase, so that a pulse signal is generated at a fault point position. And the pulse signals are detected and analyzed, so that the positions of the fault points can be more accurately positioned.
Optionally, the pulse detection sensor includes a resonant circuit and a signal transmitting antenna, wherein: the resonant circuit comprises a coupling capacitor and an inductor, and the coupling capacitor and the inductor are connected in series; the resonant circuit is configured to amplify the fault pulse signal; the signal transmitting antenna is located between the coupling capacitor and the inductor, and the signal transmitting antenna is configured to transmit the fault pulse signal in the form of an electromagnetic wave. The fault pulse signal is amplified, so that the fault pulse signal can be analyzed and processed more easily, and the analysis speed of the fault pulse signal is improved.
Optionally, the switch is a split-phase switch and is configured to control the single-phase independent on-off of the three-phase circuit. The single-phase circuit of the three-phase circuit can be independently switched on and off, and the fault phase can be switched on again after a single-phase earth fault occurs.
Optionally, the active compensation device includes a voltage source module and a boost module, wherein: the voltage source module is configured to be capable of outputting a voltage signal of a nominal magnitude; the boost module is configured to amplify the output signal magnitude of the voltage source module to the line voltage magnitude of the three-phase circuit. The voltage signal with the same amplitude as that in normal work is provided for a fault phase in the case of single-phase earth fault, so that a fault point generates a pulse signal, and the voltage amplitude is equal to the line voltage in the case of normal work of the fault phase, so that a detection environment closer to the normal work is provided, and the fault point is more accurately positioned.
Optionally, the terminal arm includes a first terminal and a second terminal, wherein: the first terminal and the second terminal are connected in series; the first and second terminals are configured to short circuit the failed phase switch when a single phase ground fault occurs in the three phase circuit.
Optionally, the wiring arm further includes a short-circuit switch, one end of the short-circuit switch is connected to the first terminal, and the other end of the short-circuit switch is connected to the second terminal; the shorting switch is configured to close when the connecting arm is connected to both sides of the switch. The connection arm may short-circuit the switch of a faulted phase, enabling the active compensation device to supply power to the faulted phase.
Optionally, the signal receiving apparatus includes a signal receiving module and a signal screening module, wherein: the signal receiving module is configured to receive a fault pulse signal emitted by the pulse detection sensor and transmit the fault pulse signal to the signal screening module; the signal screening module is configured to receive the fault pulse signals transmitted by the signal receiving module, screen the fault pulse signals according with the preset frequency and acquire the generation position of the fault pulse signals with the maximum frequency. Through screening the pulse fault signals, fault point positions can be more accurately positioned, and the fault positioning accuracy is improved.
According to a second aspect of the embodiments of the present invention, there is provided a three-phase circuit fault detection method, including: when a single-phase earth fault occurs in the three-phase circuit, closing a switch of the fault phase; the active compensation device generates a voltage signal with a preset amplitude value so as to enable a line fault point to generate a pulse signal; amplifying and transmitting the pulse signal by a pulse detection sensor; and receiving the pulse signal through a signal receiving device to acquire the position of the fault point.
Optionally, the step of closing the switch of the failed phase includes: if the switch of the fault phase can be opened and closed in a single phase, closing the switch of the fault phase; and if the switch of the fault phase can not be opened and closed in a single phase, connecting the wiring arm to two sides of the switch of the fault phase.
Optionally, the step of obtaining the location of the fault point includes: screening the pulse signals within a preset frequency range; acquiring the pulse detection sensor position at which the pulse signal of the maximum frequency is detected; and acquiring a fault point position according to the position of the pulse detection sensor.
According to the technical scheme, the application provides a three-phase circuit fault finding system and a method, and the system comprises: a pulse detection sensor configured to detect a malfunction pulse signal and transmit the malfunction pulse signal in the form of an electromagnetic wave. A switch configured to control the three-phase circuit to be switched on and off. And the active compensation device is configured to start when a single-phase earth fault occurs in the line, and supply power to the fault phase. And the wiring arm is configured to be automatically connected to two sides of the switch of the fault phase when the line has a single-phase earth fault. A signal receiving device configured to receive the electromagnetic wave signal emitted by the pulse detection sensor. The active compensation device supplies power to the fault phase, so that the fault point location of the fault phase generates a pulse signal, the pulse detection sensor can detect and transmit the pulse signal, the signal receiving device receives the pulse signal and performs screening analysis to obtain the generation position of the pulse signal, and the fault point location positioning accuracy of the single-phase earth fault is improved.
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 diagram of a three-phase circuit fault finding system of the present application;
FIG. 2 is a schematic diagram of a pulse detection sensor according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of an active compensation apparatus according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a connection arm according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a signal receiving apparatus according to an embodiment of the present application;
FIG. 6 is a diagram illustrating an example of an installation of a three-phase circuit fault finding system in an embodiment of the present application;
fig. 7 is a schematic flowchart of a three-phase circuit fault finding method according to the present application.
Illustration of the drawings:
wherein, 1-pulse detection sensor; 2-a switch; 3-an active compensation device; 4-a wiring arm; 5-a signal receiving means; 10-a resonant circuit; 11-a coupling capacitance; 12-an inductance; 13-a signal transmitting antenna; 31-a voltage source module; 32-a boost module; 41-a first terminal; 42-a second terminal; 43-short circuit switch; 51-a signal receiving module; 52-Signal screening Module.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of apparatus and methods consistent with certain aspects of the application, as recited in the claims.
The grounding mode of the power distribution network generally comprises a low-current grounding mode and a high-current grounding mode. The difference between the small-current grounding system and the large-current grounding system is the ratio of zero-sequence reactance to positive-sequence reactance in the system, the system with the ratio not greater than 4-5 is the large-current grounding system, and the system with the ratio greater than 4-5 is the small-current grounding system. The single-phase earth fault is a common fault in the power distribution network, and the small-current earth system has the advantages that the power distribution network can be ensured to continuously run for 1-2 hours when the single-phase earth fault occurs, the continuous power supply of a user is not influenced, but if the earth fault is not timely processed, the insulation breakdown is possibly caused due to the fact that the voltage of a non-fault phase line is increased, and further serious accidents such as phase-to-phase short circuit are caused. The large-current grounding system has the advantages that the manufacturing cost is low compared with that of a small-current grounding system, but continuous power supply is influenced when a single-phase grounding fault occurs, and the power supply reliability is reduced. And thus a low current grounding system is widely used.
In order to enable a small-current grounding system to stably operate, a fault point of a single-phase grounding fault needs to be timely positioned, but a common fault positioning means has the problem of low positioning accuracy, for example, an impedance method is used for calculating the distance relationship between the fault point and a measuring point through a measuring point signal and fault loop impedance after the grounding fault occurs, but the method is not suitable for a power distribution network with a complex structure and is not accurate in positioning. Therefore, the application provides a three-phase circuit fault finding system and a three-phase circuit fault finding method to solve the problem that the single-phase earth fault point location is not accurate.
Referring to fig. 1, a schematic structural diagram of a three-phase circuit fault finding system according to the present application is shown. As can be seen from fig. 1, the system is applied in a three-phase circuit, the system comprising: pulse detection sensor 1, switch 2, active compensation device 3, wiring arm 4 and signal receiving device 5. The pulse detection sensor 1, the switch 2 and the active compensation device 3 are all required to be connected with a three-phase circuit, the wiring arms 4 are connected to two sides of the switch 2 only when the three-phase circuit has a single-phase earth fault, and the signal receiving device 5 is in wireless connection with the pulse detection sensor 1.
One end of the pulse detection sensor 1 is connected with the three-phase circuit, and the other end of the pulse detection sensor is grounded and used for detecting and transmitting fault pulses in the three-phase circuit. It should be noted that the number of the pulse detection sensors 1 needs to be installed according to the complexity of the power distribution network, and one pulse detection sensor 1 is connected to only one of the three-phase circuits, and is not limited to the case where one pulse detection sensor 1 is placed in each phase circuit as shown in fig. 1. In some embodiments of the present application, the pulse detection sensor 1 may be arranged and installed at a certain distance on each phase circuit, so as to effectively improve the accuracy of fault point positioning.
In some embodiments of the present application, the pulse detection sensor 1 is also used to amplify a fault pulse signal. As shown in fig. 2, the pulse detection sensor 1 includes a resonant circuit 10 and a signal transmitting antenna 13, wherein the resonant circuit 10 is formed by connecting a coupling capacitor 11 and an inductor 12 in series. The resonant circuit 10 can amplify the fault pulse signal, and the amplified fault pulse signal is transmitted to the signal transmitting antenna 13 and is transmitted. The signal transmitting antenna 13 is connected between the coupling capacitor 11 and the inductor 12, and the signal transmitting antenna 13 can transmit the fault pulse signal in the form of electromagnetic wave.
It should be noted that the signal transmitting antenna 13 can limit the frequency range of the transmitted pulse signals, filter out signals that are not in the frequency range in the pulse signals, for example, the frequency range is 40kHz to 20MHz, filter out the pulse signals that are acquired by the resonance circuit 10 and have frequencies that are not in the frequency range, and transmit only the filtered pulse signals. Without limiting the transmission frequency, all the acquired pulse signals may be transmitted by the signal transmitting antenna 13.
As shown in fig. 1, the switch 2 is provided at the start end of the three-phase circuit. The switch 2 can control the on-off of the three-phase circuit. In some embodiments of the present application, the switch 2 can only control the on/off of the three-phase circuit at the same time, but cannot control the single-phase on/off of the three-phase circuit. Under the condition that the fault phase cannot be independently switched on, the wiring arm 4 is required to short-circuit the switch 2 of the fault phase, so that the fault phase is switched on.
In some embodiments of the present application, the switch 2 is a split-phase switch, which can be used to control the on/off of each phase in a three-phase circuit. When a single-phase earth fault occurs in the power distribution network, the fault phase can be switched on by closing the switch 2 of the fault phase, and the wiring arm 4 is not needed to be in short circuit with the switch 2, so that time is saved, and the efficiency of fault finding is improved.
As shown in fig. 1, one end of the active compensation device 3 is connected to a neutral point of a three-phase circuit, and the other end is grounded. The active compensation device 3 is used for supplying power to a fault phase when a single-phase earth fault occurs, so that a fault point position of the fault phase generates a pulse signal which is detected by the pulse detection sensor 1. In some embodiments of the present application, as shown in fig. 3, the active compensation device 3 includes a voltage source module 31 and a boost module 32. The voltage source module 31 can provide a voltage signal with a fixed voltage amplitude, and the voltage boost module 32 can amplify the signal with the fixed voltage amplitude sent by the voltage source module 31 to the line voltage of the three-phase circuit, for example, the line voltage of the three-phase circuit in the conventional medium voltage distribution network is the line voltage of the three-phase circuit
At this time, the voltage boosting module 32 is required to amplify the voltage signal from the voltage source module 31 to
The requirement of the voltage source module 31 can be reduced by the boost module 32, and the cost of the voltage source module 31 can be reduced.
As shown in fig. 1, the terminal arm 4 is placed near the three-phase circuit when a fault does not occur. When a three-phase circuit has a single-phase earth fault, the wiring arm 4 can be connected to two sides of the switch 2 to short-circuit the switch 2. The wiring arm 4 can short-circuit the switch 2 when the switch 2 can not be closed in a single phase, and a circuit of a fault phase is switched on, so that the active compensation device 3 can smoothly supply power for the fault phase. In some embodiments of the present application, as shown in fig. 4, the connection arm 4 includes a first terminal 41 and a second terminal 42, and the first terminal 41 is connected in series with the second terminal 42. When a single-phase ground fault occurs, the first terminal 41 is connected to one side of the switch 2 of the fault phase, and the second terminal 42 is connected to the other side of the switch 2 of the fault phase, because the first terminal 41 and the second terminal 42 are connected in series, no other component exists between the two terminals, the resistance value is small, and the switch 2 of the fault phase can be short-circuited. By mounting the wiring arm 4 through the first terminal 41 and the second terminal 42, the wiring arm 4 can be more conveniently mounted to both sides of the switch 2 of the failed phase.
It should be noted that, in some embodiments of the present application, terminals corresponding to the first terminal 41 and the second terminal 42 may be disposed on two sides of the switch 2 of the three-phase circuit, so that when the connection arm 4 needs to short-circuit the switch 2, the connection process is simplified, and the trouble shooting time is prevented from being lengthened.
As shown in fig. 1, the signal receiving device 5 receives a signal in the form of an electromagnetic wave emitted by the pulse detection sensor 1 through a wireless connection. In some embodiments of the present application, the wireless connection between the signal receiving device 5 and the pulse detection sensor 1 can be realized by receiving and transmitting electromagnetic wave signals through a receiving and transmitting antenna. The wired receiving means of contrast need not additionally set up the medium, avoids the circuit winding, avoids high voltage transmission lines electric leakage to cause check out test set to damage simultaneously. The signal receiving device 5 is not wired to other parts of the system, but is only wirelessly connected to the pulse detection sensors 1, and the same signal receiving device 5 can receive pulse signals transmitted from a plurality of pulse detection sensors 1. However, since the power of the pulse signal transmitted by the pulse detection sensor 1 is limited, in a scene where a three-phase circuit is complicated, the number of the signal receiving devices 5 may be plural, and thus the pulse signal transmitted by the pulse detection sensor 1 cannot be received.
In some embodiments of the present application, as shown in fig. 5, the signal receiving apparatus 5 includes a signal receiving module 51 and a signal filtering module 52. The signal receiving module 51 may be configured as a signal receiving antenna, or other device capable of receiving pulse signals in the form of electromagnetic waves. The signal receiving module 51 can simultaneously receive the pulse signals transmitted by the signal transmitting antennas 13 of the plurality of pulse detection sensors 1, and send the received pulse signals to the signal screening module 52. After receiving the pulse signal, the signal screening module 52 screens out the pulse signal that meets a preset frequency range, obtains the position of the pulse detection sensor 1 that detects the pulse signal with the maximum frequency, and obtains the accurate position of the fault point according to the position.
It should be noted that, in some embodiments of the present application, the signal receiving module 51 may perform primary screening on the collected fault pulse signal together with the signal transmitting antenna 13 in the pulse detection sensor 1, so as to reduce the data amount received and screened by the signal screening module 52, and improve the efficiency of troubleshooting.
As shown in fig. 6, which is an installation example of a three-phase circuit fault finding system, the switch 2 of a fault phase in a three-phase circuit with a single-phase ground fault cannot independently perform on-off operation on the fault phase, and the connection arm 4 is connected to two sides of the switch 2 of the fault phase to short-circuit the communication circuit of the switch 2. The active compensation device 3 is started to supply power to the fault phase, so that the fault phase generates a fault pulse signal, and the pulse detection sensor 1 detects the fault pulse signal and sends the fault pulse signal to the signal receiving device 5. The signal receiving means 5 are placed at a distance from the three-phase circuit to avoid interference. Through the frequency of the fault pulse signal and the position of the pulse detection sensor 1 for acquiring the fault pulse signal, the signal receiving device 5 can position a fault point, and the accuracy of troubleshooting is improved.
Based on the three-phase circuit fault finding system, as shown in fig. 7, the present application further provides a three-phase circuit fault finding method, including the following steps:
s1: when a single-phase earth fault occurs in the three-phase circuit, the switch 2 of the faulted phase is closed.
Wherein the three-phase circuit is a common structure of a power distribution network. When a single-phase earth fault occurs, the voltage of the fault phase is reduced or no voltage is generated, under the condition, the closed state of the switch 2 of the fault phase needs to be confirmed, and if the switch 2 is in the non-closed state, the switch 2 needs to be closed to be communicated with the fault phase.
In some embodiments of the present application, if the switch 2 cannot be opened or closed in a single phase, the switch 2 in the fault phase needs to be shorted through the connection arm 4, so that the fault phase remains connected.
S2: the active compensation device 3 generates a voltage signal with a preset amplitude value so as to enable a line fault point to generate a pulse signal.
After the fault is connected, the active compensation device 3 is started and generates a voltage signal with a preset voltage amplitude to serve as a voltage source of the fault phase. The preset voltage amplitude is the line voltage when the fault phase normally works, and pulse signals generated by the fault point of the fault phase are closer to the actual working condition by simulating the working voltage of the fault phase, so that the fault point is conveniently positioned.
S3: the pulse signal is amplified and transmitted by the pulse detection sensor 1.
The pulse signal is amplified by the resonance circuit 10 in the pulse detection sensor 1 and is transmitted in the form of electromagnetic waves by the signal transmitting antenna 13.
S4: and receiving the pulse signal through a signal receiving device 5 to acquire the position of the fault point.
The signal receiving device 5 receives the pulse signal in the form of the electromagnetic wave, obtains the position of the pulse detection sensor 1 that detects the pulse signal of the maximum frequency by screening the pulse signal within a preset frequency range, and then obtains the position of a fault point according to the position of the pulse detection sensor 1.
According to the technical scheme, the system and the method for searching the three-phase circuit fault are characterized in that the system detects the fault pulse signal of the fault phase when the single-phase earth fault occurs through the pulse detection sensor 1 and transmits the fault pulse signal in the form of electromagnetic waves. The faults are communicated through the switch 2 or the wiring arm 4, and the active compensation device 3 is convenient to supply power. The signal receiving device 5 receives the fault pulse signal transmitted by the pulse detection sensor 1, screens the fault pulse signal within a preset frequency range, and obtains the position of the pulse detection sensor 1, where the pulse signal with the maximum frequency is detected, so as to obtain a fault point location. The system simulates the working voltage of a fault phase by arranging the active compensation device 3, so that a fault pulse signal generated by a fault point location is closer to the actual working condition, the fault point location is quickly positioned, and the fault point location accuracy of the single-phase earth fault is improved.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (10)
1. A three-phase circuit fault finding system, the system comprising: pulse detection sensor (1), switch (2), active compensation device (3), wiring arm (4) and signal receiver (5), wherein:
one end of the pulse detection sensor (1) is connected with a three-phase circuit, and the other end of the pulse detection sensor is grounded, and the pulse detection sensor (1) is configured to detect a fault pulse signal and transmit the fault pulse signal in the form of electromagnetic waves;
the switch (2) is connected to the initial end of each phase cable of the three-phase circuit, and the switch (2) is configured to control the three-phase circuit to be switched on and off;
one end of the active compensation device (3) is connected with a neutral point of a three-phase circuit, and the other end of the active compensation device is grounded, and the active compensation device (3) is configured to be started when a single-phase ground fault occurs in a circuit and supply power to a fault phase;
the wiring arm (4) is configured to be automatically connected to two sides of the switch (2) in a fault phase when a single-phase earth fault occurs in a line;
the signal receiving device (5) is wirelessly connected with the pulse detection sensor (1), and the signal receiving device (5) is configured to receive the electromagnetic wave signal emitted by the pulse detection sensor (1).
2. A three-phase circuit fault finding system according to claim 1, characterized in that the pulse detection sensor (1) comprises a resonant circuit (10) and a signal transmitting antenna (13), wherein:
the resonance circuit (10) comprises a coupling capacitor (11) and an inductor (12), and the coupling capacitor (11) and the inductor (12) are connected in series; the resonance circuit (10) is configured to amplify the fault pulse signal;
the signal transmitting antenna (13) is located between the coupling capacitor (11) and the inductor (12), and the signal transmitting antenna (13) is configured to transmit the fault pulse signal in the form of electromagnetic waves.
3. A three-phase circuit fault finding system according to claim 1, characterized in that the switch (2) is a split-phase switch configured to control the independent switching of the three-phase circuit in a single phase.
4. A three-phase circuit fault finding system according to claim 1, characterized in that the active compensation means (3) comprises a voltage source module (31) and a voltage boost module (32), wherein:
the voltage source module (31) is configured to be able to output a voltage signal of nominal amplitude;
the boost module (32) is configured to amplify an output signal magnitude of the voltage source module (32) to a line voltage magnitude of the three-phase circuit.
5. A three-phase circuit fault finding system according to claim 1, characterized in that the connection arm (4) comprises a first terminal (41) and a second terminal (42), wherein:
the first terminal (41) and the second terminal (42) are connected in series;
the first terminal (41) and the second terminal (42) are configured to short-circuit the switch (2) in the faulted phase when a single-phase earth fault occurs in the three-phase circuit.
6. A three-phase circuit fault finding system according to claim 5, characterized in that the connection arm (4) further comprises a shorting switch (43), one end of the shorting switch (43) being connected to the first terminal (41) and the other end being connected to the second terminal (42); the shorting switch (43) is configured to close when the connecting arm (4) is connected to both sides of the switch (2).
7. A three-phase circuit fault finding system according to claim 1, characterized in that the signal receiving means (5) comprises a signal receiving module (51) and a signal screening module (52), wherein:
the signal receiving module (51) is configured to receive a fault pulse signal emitted by the pulse detection sensor (1) and transmit the fault pulse signal to the signal screening module (52);
the signal screening module (52) is configured to receive the fault pulse signal transmitted by the signal receiving module (51), screen the fault pulse signal conforming to a preset frequency and acquire a generation position of the fault pulse signal with a maximum frequency.
8. A three-phase circuit fault finding method is characterized by comprising the following steps:
when a single-phase earth fault occurs in the three-phase circuit, closing a switch (2) of the fault phase;
the active compensation device (3) generates a voltage signal with a preset amplitude value so as to enable a line fault point to generate a pulse signal;
amplifying and transmitting the pulse signal by a pulse detection sensor (1);
and receiving the pulse signal through a signal receiving device (5) to acquire the position of the fault point.
9. A three-phase circuit fault finding method according to claim 8, characterized in that the step of closing the switch (2) of the faulted phase comprises:
if the switch (2) of the fault phase can be opened and closed in a single phase, closing the switch (2) of the fault phase;
and if the switch (2) of the fault phase can not be opened and closed in a single phase, connecting the wiring arm (4) to two sides of the switch (2) of the fault phase.
10. The three-phase circuit fault finding method of claim 8, wherein the step of obtaining the fault point location comprises:
screening the pulse signals within a preset frequency range;
-acquiring the pulse detection sensor (1) position where the pulse signal of maximum frequency is detected;
and acquiring a fault point position according to the position of the pulse detection sensor (1).
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| PCT/CN2022/132371 WO2023221432A1 (en) | 2022-05-17 | 2022-11-16 | Fault finding system and method for three-phase circuit |
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| 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 |
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| CN114814464B (en) | 2024-06-14 |
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