CN114859177A - Fault finding system and method based on split-phase switch - Google Patents
Fault finding system and method based on split-phase switch Download PDFInfo
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- CN114859177A CN114859177A CN202210540745.1A CN202210540745A CN114859177A CN 114859177 A CN114859177 A CN 114859177A CN 202210540745 A CN202210540745 A CN 202210540745A CN 114859177 A CN114859177 A CN 114859177A
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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
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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 invention provides a fault finding system and method based on a split-phase switch, which adopts the split-phase switch to provide a power supply for detecting faults after a power distribution network has faults, solves the problem that an external power supply is required to judge, detect and position the faults after the faults occur, sequentially closes an A phase, a B phase and a C phase of the split-phase switch after the faults occur, utilizes the fact that the fault phase can generate pulse signals, the non-fault phase can not generate pulse signals to position the faults, sequentially closes the zero-sequence voltage change conditions of the A phase, the B phase and the C phase of the split-phase switch to judge the ground fault, and the three-phase synthesized zero-sequence voltage of a fault point is highest. The fault point position when the circuit has a plurality of faults can be judged, the type of the fault point is judged, and the fault point position information and the fault point type information are simultaneously sent to the fault detection device, so that detection personnel can determine the fault point position and the type more quickly and accurately.
Description
Technical Field
The application relates to the field of power distribution network fault detection and positioning, in particular to a fault finding system and method based on a split-phase switch.
Background
The most common fault in the power distribution network is a single-phase earth fault, if the earth fault is not removed in time, the fault state is further expanded due to long-time continuous live operation in a fault state, and the single-phase earth fault is possibly converted into an interphase short-circuit fault, so that an electric power safety accident is caused. Therefore, how to research the power distribution network fault technology to quickly locate fault occurrence points is significant for safe and reliable operation of the power distribution network.
In the prior art, fault location of a power distribution network is generally performed in a power distribution automation mode, and equipment generally adopted when fault finding is performed on the power distribution network is an insulation megger.
However, in practical application of the distribution automation fault location technology, it is required that the root cause of the fault must be found to effectively ensure the reliability and safety of the whole distribution network. The fault can be locked within a certain distance only by adopting a power distribution automation mode, and an accurate fault point cannot be given; meanwhile, the insulation megger is small in capacity and only suitable for lines with short length and small number of distribution transformers, and when the technical scenes of long line length, complex lines and the like are faced, fault points are difficult to be locked quickly and accurately in a short time, so that the power supply reliability is seriously influenced, and great workload is brought to operation and maintenance personnel.
Disclosure of Invention
In order to solve the problem that the existing fault detection and positioning technology is difficult to quickly and accurately lock the position of a fault point in a short time in the technical scene of long line length and complex line, the application provides a fault finding system and method based on a split-phase switch.
In a first aspect, the present application provides a phase-splitting switch based troubleshooting system, the system comprising:
the fault detection device comprises a fault detection sensor, a fault detection device and a fault detection device, wherein one end of the fault detection sensor is connected with a three-phase high-voltage wire, and the other end of the fault detection sensor is grounded and is configured to acquire a pulse signal sent by the three-phase high-voltage wire and send an enhanced signal to the fault detection device; the strengthening signal is the amplified pulse signal; the three-phase high-voltage line includes: a phase high-voltage line, B phase high-voltage line and C phase high-voltage line.
The split-phase switch is connected to the three-phase high-voltage line and is configured to control the on-off of the three-phase high-voltage line; the split-phase switch comprises a first switch, a second switch and a third switch; the first switch controls the on-off of the A-phase high-voltage wire, the second switch controls the on-off of the B-phase high-voltage wire, and the third switch controls the on-off of the C-phase high-voltage wire.
And the fault detection device is configured to receive the reinforced signal, determine the position of a fault point according to the reinforced signal and send out an alarm signal.
By adopting the embodiment, when the split-phase switch is switched on, the three-phase high-voltage line can send out the pulse signal, the fault detection sensor can acquire the pulse signal, amplify the pulse signal and send the amplified pulse signal to the fault detection device, the fault detection device acquires the amplified reinforced signal and judges the position of the fault point according to the reinforced signal, the position of the fault point can be accurately locked in a short time, and the efficiency of detecting personnel for processing faults is accelerated.
Further, the fault detection sensor is a three-phase sensor, and an A-phase connection wire, a B-phase connection wire and a C-phase connection wire of the fault detection sensor are connected in parallel and are connected in series with the measuring impedance; the measuring impedance is configured to measure a zero sequence voltage emitted by a three-phase high voltage line.
Coupling capacitors are respectively arranged on the phase A connection wire, the phase B connection wire and the phase C connection wire of the fault detection sensor; the phase A connection wire is connected with the phase A high-voltage wire, the phase B connection wire is connected with the phase B high-voltage wire, and the phase C connection wire is connected with the phase C high-voltage wire; the fault detection sensor is provided with a signal transmitting antenna; the signal transmitting antenna is configured to transmit the zero sequence voltage to the fault detection device.
Furthermore, the fault detection sensor is a three-phase sensor, the phase a connection wire, the phase B connection wire and the phase C connection wire of the fault detection sensor comprise a coupling capacitor connected in parallel and a measurement impedance connected in series with the coupling capacitor connected in parallel, the phase a connection wire is connected with the phase a high-voltage wire, the phase B connection wire is connected with the phase B high-voltage wire, and the phase C connection wire is connected with the phase C high-voltage wire; the fault detection sensor is provided with a signal transmitting antenna configured to transmit the reinforcement signal to the fault detection device; the coupling capacitor and the measuring impedance are configured to amplify the pulsed voltage signal to the enhanced signal and to measure a power frequency zero sequence voltage.
Further, the system further comprises:
the environment detection device is configured to detect environment information of the three-phase high-voltage line in real time, generate a danger level signal according to the environment information and send the danger level signal to the fault detection device; the environmental information includes air humidity information, air temperature information, and line density.
And the alarm device is electrically connected with the fault detection device and is configured to give an alarm according to the alarm signal.
Adopt this embodiment, detection personnel judge the danger level signal of three-phase high-voltage line through the environmental information who acquires the three-phase high-voltage line according to information such as near air humidity, air temperature of three-phase high-voltage line, and detection personnel accessible danger level signal carries out preliminary judgement to the dangerous degree of this trouble, avoids detection personnel to take place safety hazard in the testing process.
Further, an ammeter is arranged on the phase-splitting switch and is configured to monitor the current value of the three-phase high-voltage line in real time.
The ammeter is provided with a fault current measuring device, and the fault current measuring device is configured to acquire a fault current value of the three-phase high-voltage line and send the fault current value to the fault detection device when the current value exceeds a preset range.
Further, the fault detection apparatus further includes:
a frequency measurement module configured to measure a frequency of the emphasis signal.
And the data storage module is configured to store historical fault signal data received by the fault detection device when the three-phase high-voltage line fails.
By adopting the embodiment, when the three-phase high-voltage line has a fault, the historical fault signal data received by the fault detection device can be stored, and the historical fault signal data can be called as a reference at any time, so that the position of a fault point which possibly appears can be judged, and the health condition of the three-phase high-voltage line can be judged.
In a second aspect, the present application provides a split-phase switch-based fault finding method, including:
and acquiring pulse signals of the phase A high-voltage wire, the phase B high-voltage wire and the phase C high-voltage wire in the on state of the split-phase switch to obtain the phase A pulse signal, the phase B pulse signal and the phase C pulse signal.
And amplifying the A-phase pulse signal, the B-phase pulse signal and the C-phase pulse signal to obtain an A-phase enhanced signal, a B-phase enhanced signal and a C-phase enhanced signal.
And screening fault enhancement signals with the frequency within a fault frequency range from the A-phase enhancement signal, the B-phase enhancement signal and the C-phase enhancement signal, and determining the fault distance between a fault point and the fault detection sensor according to the frequency of the fault enhancement signals.
And determining the position of the fault point according to the fault distance to generate fault position information.
Further, the step of determining the location of the fault point according to the fault distance includes:
determining a first virtual fault point and a second virtual fault point which are at the fault distance from the fault detection sensor in the direction of the three-phase high-voltage line; the first and second virtual failure points are located on both sides of the failure detection sensor.
Acquiring a first pulse signal of the first virtual fault point and a second pulse signal of the second virtual fault point.
And comparing the frequencies of the first pulse signal and the second pulse signal, and determining the fault point according to the comparison result.
Further, before the step of amplifying the a-phase pulse signal, the B-phase pulse signal, and the C-phase pulse signal, the method further includes: and acquiring the current value of the three-phase high-voltage wire, and determining the amplification ranges of the A-phase pulse signal, the B-phase pulse signal and the C-phase pulse signal according to the current value.
By adopting the embodiment, the amplification ranges of the A-phase pulse signal, the B-phase pulse signal and the C-phase pulse signal are determined through the current value, and the amplified proportional relation between the A-phase enhanced signal, the B-phase enhanced signal and the C-phase enhanced signal and the current value is amplified, so that the enhanced signal can reflect the signal intensity change of the fault point more accurately.
Still further, the method further comprises:
and searching the fault type which accords with the amplification range to generate fault type information.
Sending fault information to the fault detection device; the fault information includes the fault type information and the fault location information.
Further, before the step of obtaining the pulse signals of the phase a high-voltage line, the phase B high-voltage line and the phase C high-voltage line in the on state of the split-phase switch, the method further includes:
acquiring environmental information of a three-phase high-voltage wire, and generating a danger level signal according to the environmental information; the environmental information includes air humidity information, air temperature information, and line density.
And preliminarily judging the prediction range of the fault point according to the danger level signal.
And after the fault point position is determined, judging whether the fault point position is located in the prediction range.
The application provides a fault finding system and method based on a split-phase switch, and in a first aspect, the fault finding system based on the split-phase switch comprises: fault detection sensor, split-phase switch, fault detection device. The fault detection sensor acquires a pulse signal sent by a three-phase high-voltage line, amplifies a weak pulse signal into a reinforced signal and sends the reinforced signal to the fault detection device, and the fault detection device determines the position of a fault point according to the reinforced signal after receiving the reinforced signal; the split-phase switch controls the on-off of the three-phase high-voltage line. In a second aspect, a fault finding method based on a split-phase switch obtains pulse signals of an A-phase high-voltage line, a B-phase high-voltage line and a C-phase high-voltage line in the on state of the split-phase switch, amplifies the A-phase pulse signals, the B-phase pulse signals and the C-phase pulse signals to obtain A-phase enhanced signals, B-phase enhanced signals and C-phase enhanced signals, screens out fault enhanced signals meeting a fault frequency range, determines a fault distance between a fault point and a fault sensor according to the frequency of the fault enhanced signals, and further determines the position of the fault point. This application is through the weak pulse signal amplification who sends when breaking down the three-phase high-voltage line, obtains strengthening the signal and sends to failure detection device, catches the pulse signal when the three-phase high-voltage line breaks down more easily. According to the frequency of the screening reinforcing signals, the fault high-voltage line and the fault distance are determined, the position of a fault point can be accurately and quickly positioned, and a detector can conveniently and timely solve the fault point.
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 first embodiment of a split-phase switch-based troubleshooting system;
FIG. 2 is a schematic diagram of a second embodiment of a split-phase switch-based troubleshooting system;
FIG. 3 is a schematic diagram of a phase A high-voltage line and a phase C high-voltage line which are detected by a phase-splitting switch-based fault finding system and have faults;
FIG. 4 is a schematic diagram of a third embodiment of a split-phase switch-based troubleshooting system;
FIG. 5 is a schematic diagram of a first embodiment of a split-phase switch-based troubleshooting method;
FIG. 6 is a schematic diagram of a second embodiment of a split-phase switch-based fault finding method;
FIG. 7 is a schematic diagram of a third embodiment of a split-phase switch-based fault finding method.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
In order to solve the problem that the existing fault detection and positioning technology is difficult to quickly and accurately lock the position of a fault point in a short time when the line length is long and the line is complex, the first aspect provides a fault finding system based on a split-phase switch.
Referring to fig. 1, the system comprises:
the fault detection device comprises a fault detection sensor 1, wherein one end of the fault detection sensor 1 is connected with a three-phase high-voltage wire, the other end of the fault detection sensor is grounded, and the fault detection sensor 1 is configured to acquire a pulse signal sent by the three-phase high-voltage wire and send an enhanced signal to a fault detection device 3; the strengthening signal is the amplified pulse signal; the three-phase high-voltage line includes: a phase high-voltage line, B phase high-voltage line and C phase high-voltage line. The method for acquiring the pulse signals sent by the three-phase high-voltage line comprises the steps of acquiring an A-phase pulse signal, acquiring a B-phase pulse signal and acquiring a C-phase pulse signal.
The split-phase switch 2 is connected to the three-phase high-voltage line and is configured to control the on-off of the three-phase high-voltage line; the split-phase switch 2 comprises a first switch, a second switch and a third switch; the first switch controls the on-off of the A-phase high-voltage wire, the second switch controls the on-off of the B-phase high-voltage wire, and the third switch controls the on-off of the C-phase high-voltage wire.
And the fault detection device 3 is configured to receive the reinforced signal, determine the position of a fault point according to the reinforced signal and send out an alarm signal.
Further, the fault detection sensor 1 is a three-phase sensor, and an a-phase connection wire, a B-phase connection wire and a C-phase connection wire of the fault detection sensor 1 are connected in parallel and are connected in series with the measurement impedance 12; the measuring impedance 12 is configured to measure a zero sequence voltage emitted by the three-phase high voltage line.
When the three-phase high-voltage line has a fault in the on state of the phase-splitting switch 2, a weak pulse signal is generated instantaneously at the fault point of the three-phase high-voltage line. The fault detection sensor 1 is connected on the three-phase high-voltage line, continuously monitors the three-phase high-voltage line, catches the pulse signal that the three-phase high-voltage line sent at any time, once the pulse signal is caught to the fault detection sensor 1, will enlarge the pulse signal through the resonant circuit that coupling capacitance 11 and measurement impedance 12 establish ties and constitute, obtain and strengthen the signal, signal emission antenna 13 in the rethread fault detection sensor 1 will strengthen the signal and launch with the form of electromagnetic wave, the fault detection device 3 of being more convenient for catches and receives and strengthens the signal.
The signal transmitting antenna 13 is connected to the a-phase connection, the B-phase connection, and the C-phase connection of the fault detection sensor 1, and the fault detection sensor 1 acquires an a-phase pulse signal through the a-phase interface, a B-phase pulse signal through the B-phase interface, and a C-phase pulse signal through the C-phase interface. The amplified a-phase enhanced signal, B-phase enhanced signal and C-phase enhanced signal of the a-phase pulse signal, B-phase pulse signal and C-phase pulse signal are transmitted through the signal transmitting antenna 13.
Coupling capacitors 11 are respectively arranged on the phase A connection wire, the phase B connection wire and the phase C connection wire of the fault detection sensor 1; the phase A connection wire is connected with the phase A high-voltage wire, the phase B connection wire is connected with the phase B high-voltage wire, and the phase C connection wire is connected with the phase C high-voltage wire; the failure detection sensor 1 is provided with a signal transmitting antenna 13. The signal transmitting antenna 13 is configured to transmit the zero sequence voltage to the fault detection device 3. The zero sequence voltage may be a pulse signal.
When the first switch is turned on and the second switch and the third switch are turned off, the failure detection sensor 1 acquires an a-phase zero-sequence voltage distribution U A0 (ii) a When the second switch is turned on and the first switch and the third switch are turned off, the failure detection sensor 1 acquires a B-phase zero-sequence voltage distribution U B0 (ii) a When the third switch is turned on, and the first switch and the second switch are turned off, the failure detection sensor 1 acquires an a-phase zero-sequence voltage distribution U C0 。
In some embodiments, a plurality of fault detection sensors 1 may be connected to the three-phase high-voltage line. If n fault detection sensors 1 are distributed on the A-phase high-voltage line, the zero sequence voltage of each fault detection sensor 1 is U A0i (ii) a If n fault detection sensors 1 are distributed on the B-phase high-voltage line, the zero sequence voltage of each fault detection sensor 1 is U B0i (ii) a If n fault detection sensors 1 are distributed on the C-phase high-voltage line, the zero sequence voltage of each fault detection sensor 1 is U C0i And i is 1 to n.
A. B, C phase sensor zero sequence voltage sum function of
When in use
When the voltage is equal to zero, the circuit has no ground fault; when in use
And when the zero-sequence current is not zero, judging the fault phase according to the acquisition condition of the zero-sequence current. For example, when the measured impedance 12 can obtain the zero sequence voltage U of the a phase A0 When the fault occurs, the grounding fault occurs in the A-phase high-voltage line, and then the zero sequence voltage of each fault detection sensor 1 of the A-phase high-voltage line is set to be U A0i Bringing in
In, when
And when the voltage is maximum, the grounding fault is generated beside the ith sensor of the A-phase high-voltage line, and the position of the fault point is further determined.
Further, if the impedance 12 is measured, the zero sequence voltage U of the a-phase high-voltage line can be obtained A0 In time, the zero sequence voltage of the B-phase high-voltage line can be acquired as U B0i When the phase-a high-voltage line and the phase-B high-voltage line have ground faults at the same time, the method for judging the positions of the corresponding fault points is the same as the steps, and repeated explanation is not provided here. A. B, C when the three-phase high-voltage line has a fault, the measuring impedance 12 can obtain the zero sequence voltage U of the A-phase high-voltage line at the same time A0 Zero sequence voltage U of B-phase high-voltage line B0i Zero sequence voltage U of C-phase high-voltage line C0i The method for judging the position of the corresponding fault point is the same as the steps, and will not be repeated.
In some embodiments, as in fig. 2, the system further comprises:
the environment detection device 4 is configured to detect environment information of the three-phase high-voltage line in real time, generate a danger level signal according to the environment information, and send the danger level signal to the fault detection device 3; the environmental information includes air humidity information, air temperature information, and line density.
And an alarm device 5 electrically connected to the failure detection device 3 and configured to issue an alarm according to the alarm signal. After the fault point position is determined, the alarm device 5 gives an alarm to prompt detection personnel that the fault point position is determined, so that the detection personnel can maintain or perform other processing on the fault point of the three-phase high-voltage line conveniently.
Referring to fig. 2, the environment detection device 4 is externally connected to the three-phase high-voltage line, and detects environment information, such as air humidity information, air temperature information, and line density, in the vicinity of the three-phase high-voltage line. When the air is humid and the air humidity is high, the three-phase high-voltage line is more prone to faults, such as electric leakage, electric conduction and the like, in a section with high air humidity. When the air temperature is too high, the inside of the three-phase high-voltage line may be fused, which may cause problems such as circuit breaking. When the lines between or outside the three-phase high-voltage lines are dense, faults such as open circuit and the like caused by conduction and heating of the lines may occur. And great difficulty is caused to subsequent detection, maintenance and other work.
The environmental information of measurement personnel through acquireing the three-phase high-voltage line, according to information such as near air humidity, air temperature of three-phase high-voltage line, judges the danger level signal of three-phase high-voltage line to with danger signal transmission to fault detection device 3, measurement personnel accessible danger level signal carries out preliminary judgement to the dangerous degree of this trouble, avoids measurement personnel to take place safe danger.
In some embodiments, an ammeter is disposed on the phase-splitting switch 2 and configured to monitor the current value of the three-phase high-voltage line in real time.
The ammeter is provided with a fault current measuring device, and the fault current measuring device is configured to acquire a fault current value of the three-phase high-voltage line and send the fault current value to the fault detection device 3 when the current value exceeds a preset range.
The ammeter on the phase-splitting switch 2 can monitor the current change of the three-phase high-voltage line in real time, and when the current change of the three-phase high-voltage line exceeds a preset range, the fault of one or more lines in the three-phase high-voltage line is shown. The fault current measuring device can obtain the fault current value of the three-phase high-voltage wire at the moment and send the fault current value to the fault detection device 3, so that detection personnel can conveniently check the fault current value, and compare the fault current value with the current value of the three-phase high-voltage wire in a normal working state to preliminarily judge the possible fault type.
In one embodiment, the fault detection device 3 further comprises:
a frequency measurement module configured to measure a frequency of the emphasis signal. According to the strengthening signal obtained by the fault detection device 3, the frequency of the corresponding strengthening signal is measured, and a detection person can judge the high-voltage line with a fault in the A-phase high-voltage line, the B-phase high-voltage line and the C-phase high-voltage line according to the frequency of the strengthening signal.
As shown in fig. 3, at this time, the failure detection device 3 receives the a-phase enhanced signal, the B-phase enhanced signal, and the C-phase enhanced signal. In the case of a fault in the phase a high-voltage line and the phase C high-voltage line, the frequency of the phase a enhanced signal and the phase C enhanced signal is within the fault frequency range, and the frequency of the phase B enhanced signal is not within the fault frequency range. The detection personnel can clearly judge that the A-phase high-voltage wire and the C-phase high-voltage wire have faults through the frequencies of the A-phase enhanced signal, the B-phase enhanced signal and the C-phase enhanced signal in the fault detection device 3. By adopting the embodiment, when at least two high-voltage lines in the three-phase high-voltage line have faults, the high-voltage line with the faults can be clearly judged, and the fault point is further searched and locked according to the judged high-voltage line with the faults.
And the data storage module is configured to store historical fault signal data received by the fault detection device 3 when the three-phase high-voltage line fails. When a fault occurs in the three-phase high-voltage line, the detection personnel can store the historical fault signal data received by the fault detection device 3, and can call the historical fault signal data at any time as a reference to judge the position of a fault point and judge the health condition of the three-phase high-voltage line.
In one embodiment, a plurality of fault detection sensors 1 may be connected to the three-phase high-voltage line. Referring to fig. 4, three fault detection sensors 1, namely, a first fault detection sensor, a second fault detection sensor and a third fault detection sensor, are connected to the three-phase high-voltage line. Because the fault point is located on the C-phase high-voltage line and close to the second fault detection sensor, when the first fault detection sensor, the second fault detection sensor and the third fault detection sensor send corresponding first C-phase intensified signal, second C-phase intensified signal and third C-phase intensified signal, the frequency of the second C-phase intensified signal is obviously greater than that of the first C-phase intensified signal and the third C-phase intensified signal, which indicates that the position of the fault point close to the second fault detection sensor, and a detector can further determine the position of the fault point near the second fault detection sensor through the above information. Through above embodiment, through setting up a plurality of fault detection sensors 1, detect the segmentation of three-phase high-voltage line, when confirming trouble high-voltage line, can confirm faster that the fault point is located the trouble district section on trouble high-voltage line, the progressive locking fault point position of layer by layer.
In a second aspect, the present application provides a split-phase switch-based fault finding method, as shown in fig. 5, the method comprising:
s1: pulse signals of the phase A high-voltage wire, the phase B high-voltage wire and the phase C high-voltage wire in the on state of the split-phase switch 2 are obtained to obtain the phase A pulse signal, the phase B pulse signal and the phase C pulse signal. When the phase-splitting switch 2 is switched on, the phase-A high-voltage line, the phase-B high-voltage line and the phase-C high-voltage line in the three-phase high-voltage line respectively send out pulse signals, wherein the phase-A pulse signal, the phase-B pulse signal and the phase-C pulse signal are acquired by the fault detection sensor 1.
S2: and amplifying the A-phase pulse signal, the B-phase pulse signal and the C-phase pulse signal to obtain an A-phase enhanced signal, a B-phase enhanced signal and a C-phase enhanced signal. The step S2 is performed by the failure detection sensor 1, and the a-phase pulse signal, the B-phase pulse signal, and the C-phase pulse signal are amplified in equal proportion.
S3: and screening fault enhancement signals with the frequency within a fault frequency range from the A-phase enhancement signal, the B-phase enhancement signal and the C-phase enhancement signal, and determining the fault distance between a fault point and the fault detection sensor 1 according to the frequency of the fault enhancement signals. When a fault occurs in the three-phase high-voltage line, a fault strengthening signal with the signal frequency within the fault frequency range exists in the A-phase strengthening signal, the B-phase strengthening signal and the C-phase strengthening signal, and the high-voltage line corresponding to the fault strengthening signal is the fault high-voltage line with the fault point.
For example, in some embodiments, the fault frequency range is 40kHz-20 MHz. When the A-phase enhanced signal, the B-phase enhanced signal and the C-phase enhanced signal are screened, only the frequency of the A-phase enhanced signal is within the range of 40kHz-20MHz, and then a detector can judge that a fault point exists in the A-phase high-voltage line through the information, can perform further detection and maintenance on the A-phase high-voltage line only, does not need to detect the B-phase high-voltage line and the C-phase high-voltage line any more, reduces the time for the detector to determine the fault high-voltage line, and improves the working efficiency.
In step S3, the failure distance between the failure point and the failure detection sensor 1 may be determined based on the frequency of the failure enhancement signal, and the greater the frequency of the failure enhancement signal, the closer the failure distance between the failure point and the failure detection sensor 1 is.
S4: and determining the position of the fault point according to the fault distance to generate fault position information.
As shown in fig. 6, in some embodiments, the step of determining the location of the fault point based on the fault distance includes:
s401: determining a first virtual fault point and a second virtual fault point which are at a distance from the fault detection sensor 1 in the direction of the three-phase high-voltage line as the fault distance; the first and second virtual failure points are located on both sides of the failure detection sensor 1. When the fault distance is determined, since the fault detection sensor 1 is connected to the three-phase high-voltage line, a first virtual fault point and a second virtual fault point exist at positions distant by the fault distance on both sides of the fault detection sensor 1. In the first virtual failure point and the second virtual failure point, one of the virtual failure points may fail, or both of the virtual failure points may fail at the same time.
S402: acquiring a first pulse signal of the first virtual fault point and a second pulse signal of the second virtual fault point. The fault detection device 3 acquires a first pulse signal and a second pulse signal emitted in the form of electromagnetic waves.
S403: and comparing the frequencies of the first pulse signal and the second pulse signal, and determining the fault point according to the comparison result. And judging whether the frequency of the first pulse signal and the frequency of the second pulse signal are in the fault frequency range, if so, indicating that the corresponding virtual fault point has a fault, and determining the fault point. And if the frequency of the first pulse signal and the frequency of the second pulse signal are both in the fault frequency range, namely, the two virtual fault points are explained to be in fault, and the two fault points are determined. If the first pulse signal and the second pulse signal are not in the fault frequency range, the first pulse signal and the second pulse signal can be amplified in equal proportion to obtain a first enhanced signal and a second enhanced signal, and then the first enhanced signal and the second enhanced signal are compared with the fault frequency range again.
Further, in some embodiments, between the steps of S1 and S2, the method further comprises:
s501, acquiring a current value of the three-phase high-voltage wire, and determining the amplification ranges of the A-phase pulse signal, the B-phase pulse signal and the C-phase pulse signal according to the current value.
The amplification ranges of the A-phase pulse signal, the B-phase pulse signal and the C-phase pulse signal are determined according to the current values of the three-phase high-voltage wire. When the current value is small and the amplification degree of the pulse signal of the three-phase high-voltage wire is also small, the frequency of the reinforcing signal of the three-phase high-voltage wire received by the fault detection device 3 may not be within the fault frequency range, and a detection person may judge that the three-phase high-voltage wire has no fault according to the detection result, but the actual three-phase high-voltage wire has a fault, and the fault is not removed in time, so that potential safety hazards are easily caused.
The amplification ranges of the A-phase pulse signal, the B-phase pulse signal and the C-phase pulse signal are determined through the current value, and the amplified A-phase enhanced signal, B-phase enhanced signal and C-phase enhanced signal are amplified in an equal proportion relation with the current value, so that the enhanced signal can reflect the signal intensity change of a fault point more accurately.
Further, after the step of S501, the method further includes:
s502: and searching the fault type which accords with the amplification range to generate fault type information.
When a fault occurs, the pulse signal sent by the three-phase high-voltage line is weak. Therefore, it is possible to find a fault type conforming to the corresponding range by determining the amplification range of the pulse signal.
For example, when the voltage of the faulty high-voltage line temporarily rises, the frequency of the pulse signal emitted is large, and therefore the faulty high-voltage line can be detected by amplifying a small range. And according to the enlarged range, judging that the three-phase high-voltage line possibly has incomplete earth faults, and generating fault type information of the incomplete earth faults.
S503: sending fault information to the fault detection device 3; the fault information includes the fault type information and the fault location information. The fault detection device 3 determines the position and the type of the fault according to the fault type information and the fault position information, reduces the range of the possible fault types by enlarging the range of the three-phase high-voltage line, reduces the time for judging the fault types and improves the detection efficiency.
In some embodiments, as shown in fig. 7, before the step of obtaining the pulse signals of the phase a high-voltage line, the phase B high-voltage line and the phase C high-voltage line in the on state of the split-phase switch, the method further includes:
s601: acquiring environmental information of a three-phase high-voltage wire, and generating a danger level signal according to the environmental information; the environmental information includes air humidity information, air temperature information, and line density. The danger level signal of the three-phase high-voltage line is high, which indicates that the possibility of the three-phase high-voltage line being out of order is high.
In some embodiments, the environmental information of the phase a high-voltage line, the phase B high-voltage line and the phase C high-voltage line may be acquired to obtain a phase a high-voltage line danger level signal, a phase B high-voltage line danger level signal and a phase C high-voltage line danger level signal, and the possibility of a fault occurring in the phase a high-voltage line, the phase B high-voltage line and the phase C high-voltage line may be determined according to the corresponding danger level signals.
In some embodiments, environmental information of a line section of one of the three-phase high-voltage lines can be further judged, and a corresponding danger level signal is generated. For example, the phase a high-voltage line is divided into X, Y two sections, the environmental information of the section X is obtained, and the danger level signal of the section X is generated; and acquiring environmental information of the Y section, generating a dangerous grade signal of the Y section, and comparing the dangerous grade signal of the X section with the dangerous grade signal of the Y section to obtain a line section with high possibility of fault in the A-phase high-voltage line.
S602: and preliminarily judging the prediction range of the fault point according to the danger level signal. The prediction range is a range in which the risk level signal is high, and the higher the risk level is, the higher the possibility of failure of the corresponding range is.
S603: and after the fault point position is determined, judging whether the fault point position is located in the prediction range. After the fault point position is determined, it is checked whether the fault point position is within the prediction range of the fault point in step S602, if so, the fault type and position of the fault point are recorded, and when a similar fault occurs again, the high-voltage line of the prediction range of the fault point is preferentially detected.
According to the technical scheme, in the first aspect, the application provides a fault finding system based on the split-phase switch, the fault detection sensor acquires pulse signals of the three-phase high-voltage line in the on state, amplifies the pulse signals into strengthening signals, the strengthening signals are transmitted in the form of electromagnetic waves through the fault detection sensor, and after the strengthening signals are received by the fault detection device, the position of a fault point in the three-phase high-voltage line is determined according to the strengthening signals. Through the mode of amplifying the pulse signal, the pulse signal sent by the fault point can be detected more easily, the fault point is locked simply and quickly, the fault type is judged, the detection time is greatly shortened, and the working efficiency is improved. In a second aspect, the application provides a fault finding method based on a split-phase switch, pulse signals of an A-phase high-voltage wire, a B-phase high-voltage wire and a C-phase high-voltage wire in a three-phase high-voltage wire are obtained and amplified to obtain an A-phase enhanced signal, a B-phase enhanced signal and a C-phase enhanced signal, a fault enhanced signal with the frequency within a fault frequency range is screened to determine a fault high-voltage line, and the position of a fault point is further determined. The method can judge the fault point position when a plurality of lines have faults and judge the type of the fault point, and simultaneously send the fault point position information and the fault point type information to the fault detection device, so that detection personnel can determine the fault point position and the type more quickly and accurately, and the detection time is shortened.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A phase-splitting switch based troubleshooting system, the system comprising:
the fault detection device comprises a fault detection sensor (1), wherein one end of the fault detection sensor (1) is connected with a three-phase high-voltage wire, the other end of the fault detection sensor is grounded, and the fault detection sensor is configured to acquire a pulse signal sent by the three-phase high-voltage wire and send a strengthening signal to a fault detection device (3); the strengthening signal is the amplified pulse signal; the three-phase high-voltage line includes: the phase A high-voltage line, the phase B high-voltage line and the phase C high-voltage line;
the split-phase switch (2) is connected to the three-phase high-voltage line and is configured to control the on-off of the three-phase high-voltage line; the split-phase switch (2) comprises a first switch, a second switch and a third switch; the first switch controls the on-off of the phase A high-voltage wire, the second switch controls the on-off of the phase B high-voltage wire, and the third switch controls the on-off of the phase C high-voltage wire;
and the fault detection device (3) is configured to receive the reinforced signal, determine the position of a fault point according to the reinforced signal and send out an alarm signal.
2. The phase-splitting switch-based fault finding system according to claim 1, wherein the fault detection sensor (1) is a three-phase sensor, and the a-phase connection, the B-phase connection and the C-phase connection of the fault detection sensor (1) are connected in parallel and are connected in series with the measuring impedance (12); the measuring impedance (12) is configured to measure a pulsed zero-sequence voltage and a power frequency zero-sequence voltage emitted by the three-phase high-voltage line;
coupling capacitors (11) are respectively arranged on an A-phase connection wire, a B-phase connection wire and a C-phase connection wire of the fault detection sensor (1); the phase A connection wire is connected with the phase A high-voltage wire, the phase B connection wire is connected with the phase B high-voltage wire, and the phase C connection wire is connected with the phase C high-voltage wire; the fault detection sensor (1) is provided with a signal transmitting antenna (13); the signal transmitting antenna (13) is configured to transmit the pulsed zero sequence voltage and the power frequency zero sequence voltage to the fault detection device (3).
3. The split-phase switch based fault finding system as claimed in claim 1, further comprising:
the environment detection device (4) is configured to detect environment information of the three-phase high-voltage line in real time, generate a danger level signal according to the environment information and send the danger level signal to the fault detection device (3); the environment information comprises air humidity information, air temperature information and line density;
an alarm device (5), electrically connected to the failure detection device (3), configured to issue an alarm in accordance with the alarm signal.
4. The split-phase switch based fault finding system according to claim 1, characterized in that an ammeter is arranged on the split-phase switch (2) and is configured to monitor the current value of the three-phase high-voltage line in real time;
the ammeter is provided with a fault current measuring device, and the fault current measuring device is configured to acquire a fault current value of the three-phase high-voltage wire and send the fault current value to the fault detection device (3) when the current value exceeds a preset range.
5. The split-phase switch based fault finding system as claimed in claim 1, wherein said fault detection means (3) further comprises:
a frequency measurement module configured to measure a frequency of the emphasis signal;
a data storage module configured to store historical fault signal data received by the fault detection device (3) when the three-phase high-voltage line fails.
6. A fault finding method based on a split-phase switch is characterized by comprising the following steps:
acquiring pulse signals of an A-phase high-voltage wire, a B-phase high-voltage wire and a C-phase high-voltage wire in the on state of the split-phase switch (2) to obtain an A-phase pulse signal, a B-phase pulse signal and a C-phase pulse signal;
amplifying the A-phase pulse signal, the B-phase pulse signal and the C-phase pulse signal to obtain an A-phase enhanced signal, a B-phase enhanced signal and a C-phase enhanced signal;
screening fault enhancement signals with the frequency within a fault frequency range from the A-phase enhancement signal, the B-phase enhancement signal and the C-phase enhancement signal, and determining the fault distance between a fault point and a fault detection sensor (1) according to the frequency of the fault enhancement signals;
and determining the position of the fault point according to the fault distance to generate fault position information.
7. The phase-splitting switch based fault finding method according to claim 6, wherein the step of determining the position of the fault point according to the fault distance comprises:
determining a first and a second imaginary fault point in the direction of the three-phase high-voltage line at a distance from the fault detection sensor (1) as the fault distance; the first and second virtual failure points are located on both sides of the failure detection sensor (1);
acquiring a first pulse signal of the first virtual fault point and a second pulse signal of the second virtual fault point;
and comparing the frequencies of the first pulse signal and the second pulse signal, and determining the fault point according to the comparison result.
8. The phase-splitting switch based fault finding method according to claim 6, wherein before the step of amplifying the A-phase pulse signal, the B-phase pulse signal and the C-phase pulse signal, the method further comprises: and acquiring the current value of the three-phase high-voltage wire, and determining the amplification ranges of the A-phase pulse signal, the B-phase pulse signal and the C-phase pulse signal according to the current value.
9. The split-phase switch-based troubleshooting method of claim 8 further comprising:
searching the fault type which accords with the amplification range to generate fault type information;
sending fault information to a fault detection device (3); the fault information includes the fault type information and the fault location information.
10. The split-phase switch-based troubleshooting method of claim 6 wherein prior to said step of obtaining pulse signals for a-phase high voltage line, B-phase high voltage line and C-phase high voltage line in a switch-on state of the split-phase switch (2), said method further comprises:
acquiring environmental information of a three-phase high-voltage wire, and generating a danger level signal according to the environmental information; the environment information comprises air humidity information, air temperature information and line density;
preliminarily judging the prediction range of the fault point according to the danger level signal;
and after the fault point position is determined, judging whether the fault point position is located in the prediction range.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210540745.1A CN114859177A (en) | 2022-05-17 | 2022-05-17 | Fault finding system and method based on split-phase switch |
| PCT/CN2022/131942 WO2023221428A1 (en) | 2022-05-17 | 2022-11-15 | Split-phase switch-based fault search system and method |
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| CN202210540745.1A CN114859177A (en) | 2022-05-17 | 2022-05-17 | Fault finding system and method based on split-phase switch |
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| CN202210540745.1A Pending CN114859177A (en) | 2022-05-17 | 2022-05-17 | Fault finding system and method based on split-phase switch |
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| WO2023221428A1 (en) * | 2022-05-17 | 2023-11-23 | 云南电网有限责任公司临沧供电局 | Split-phase switch-based fault search system and method |
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| WO2023221428A1 (en) | 2023-11-23 |
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