CN112763840A - Method and device for positioning and monitoring line fault of power distribution system - Google Patents
Method and device for positioning and monitoring line fault of power distribution system Download PDFInfo
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- CN112763840A CN112763840A CN202010525251.7A CN202010525251A CN112763840A CN 112763840 A CN112763840 A CN 112763840A CN 202010525251 A CN202010525251 A CN 202010525251A CN 112763840 A CN112763840 A CN 112763840A
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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
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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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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- 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
- G01R31/54—Testing for continuity
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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
- G01R31/58—Testing of lines, cables or conductors
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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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- Locating Faults (AREA)
Abstract
The invention provides a method and a device for positioning and monitoring line faults of a power distribution system, wherein the method comprises the following steps: continuously transmitting a first-step signal to a tested line; receiving a second step signal, wherein the second step signal is a reflected signal after the first step signal meets a fault point in the tested line; comparing the characteristics of the first step signal and the second step signal, and judging the fault type of the fault point; and determining the position of a fault point of a preset fault type. The problem of line fault lead to whole distribution system unsafe is solved. The first step signal is continuously transmitted to the tested line, the second step signal reflected after the first step signal meets the fault point in the preset line is analyzed, the fault type of the fault point is obtained, the position of the fault point of the preset fault type is determined, the faults in the line are monitored in real time, the position of the fault point of the preset fault type is determined, the fault point is rapidly overhauled, and the safety factor of the whole power distribution system is improved.
Description
Technical Field
The invention belongs to the technical field of power distribution equipment, and particularly relates to a method and a device for positioning and monitoring line faults of a power distribution system.
Background
The line is the necessary connection transport piece of distribution system, and the safety of line also is one of the main factor of guaranteeing distribution environment safety, and the line may have various faults, also can increase the danger of whole distribution environment because of the line trouble.
For example, an arc in a line is characterized by high temperature, low current and short duration, and once a breakdown point occurs, the arc frequently occurs, and when the arc discharges, a large amount of heat is generated to ignite flammable and explosive substances around, so as to cause a fire or even an explosion.
When fault electric arcs occur in the lines, fire hazard can be caused to the whole power distribution system, so that the lines in the power distribution system need to be subjected to fault monitoring, and the problem that the whole power distribution system is unsafe due to line faults is solved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a method and a device for positioning and monitoring the line fault of a power distribution system, and solves the problem that the whole power distribution system is unsafe due to the existing line fault.
In order to achieve the above purpose, the invention provides a method for positioning and monitoring a line fault of a power distribution system, which comprises the following steps:
continuously transmitting a first-step signal to a tested line;
receiving a second step signal, wherein the second step signal is a reflected signal after the first step signal meets a fault point in the tested line;
comparing the characteristics of the first step signal and the second step signal, and judging the fault type of the fault point;
and determining the position of a fault point of a preset fault type.
Optionally, the first step signal is a square wave or a sine wave, and the square wave or the sine wave has a preset frequency and amplitude.
Optionally, comparing the characteristics of the first step signal and the second step signal means comparing waveform characteristics of the first step signal and the second step signal, and determining a fault type of the fault point according to a waveform change of the second step signal.
Further, the fault types include short circuit, open circuit, and resistance change.
Further, the resistance change includes resistance change caused by fault arc and residual current.
Optionally, the position of the fault point of the preset fault type is determined, and the distance between the transmitting point for transmitting the first-step signal and the fault point is calculated by calculating the time and the transmission speed for transmitting the first-step signal to the fault point.
Further, a first step signal is respectively emitted at one end of L, N phase lines of the tested line, and a reflected second step signal is respectively received at one end of L, N phase lines of the tested line.
Optionally, after comparing the characteristics of the first step signal and the second step signal, and determining that the fault type is a fault arc,
and respectively determining the position of the fault arc monitored by the L, N phase line, and judging whether the fault arc is a series arc or a parallel arc.
The invention provides a power distribution system line fault positioning and monitoring device, which comprises a signal transmitting module, a signal receiving module, a comparison module and a calculation module which are integrated into a whole;
the power distribution system line fault positioning and monitoring device is used for being installed on a line to be tested;
the signal transmitting module is used for continuously transmitting a first-step signal to a line to be detected;
the signal receiving module is used for receiving a first step signal and a second step signal reflected after a fault point in a tested line meets the first step signal;
the comparison module is used for comparing the characteristics of the first step signal and the second step signal;
the calculation module is used for calculating the position of the fault point of the preset fault type.
Optionally, the number of the power distribution system line fault positioning and monitoring devices is two;
and the two power distribution system line fault positioning and monitoring devices are respectively arranged on L, N phase lines of a line to be tested.
The invention provides a method and a device for positioning and monitoring line faults of a power distribution system, which have the beneficial effects that: firstly, continuously transmitting a first step signal to a tested line, and receiving a reflected second step signal after the first step signal meets a fault point in the tested line; judging the fault type of the fault point by comparing the characteristics of the first step signal and the second step signal; finally, determining the position of a fault point of a preset fault type; the fault in the circuit can be monitored in real time, the preset fault type can be known according to the judged fault type, the position of the fault point of the preset fault type is accurately positioned, the fault point of the preset fault type is quickly overhauled, the danger of the fault point of the preset fault type on the circuit is avoided, and the safety factor of the whole power distribution system is improved.
Drawings
Fig. 1 is a flowchart of a method for locating and monitoring a line fault of a power distribution system according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a method for locating and monitoring a line fault of a power distribution system according to a first embodiment and a second embodiment of the present invention;
fig. 3 is a circuit diagram of a method for locating and monitoring a line fault of a power distribution system according to a third embodiment of the present invention;
fig. 4 is a circuit diagram of a line fault location monitoring device of a power distribution system according to a fourth embodiment of the present invention.
The reference numbers illustrate:
1. a power distribution system line fault positioning and monitoring device; 2. a line under test; 11. a signal transmitting module; 12. a signal receiving module; 13. a comparison module; 14. a calculation module; 21. a fault point; 22. and (4) loading.
Detailed Description
The invention discloses a method and a device for positioning and monitoring line faults of a power distribution system.
Example one
Fig. 1 is a flowchart of a method for locating and monitoring a line fault of a power distribution system according to an embodiment of the present invention; fig. 2 is a circuit diagram for providing a method for locating and monitoring a line fault of a power distribution system according to an embodiment of the present invention.
As shown in fig. 1 and fig. 2, a method for locating and monitoring a line fault of a power distribution system according to a first embodiment of the present invention includes the following steps:
s101, continuously transmitting a first step signal to a tested line 2;
s102 receiving a second step signal, wherein the second step signal is a reflected signal after the first step signal meets a fault point 21 in the tested line 2;
s103, comparing the characteristics of the first step signal and the second step signal, and judging the fault type of the fault point 21;
s104 determines the position of the failure point 21 of the preset failure type.
Through step S101, the first step signal is continuously transmitted to the line under test 2: namely, continuously transmitting a first step signal with known characteristics to the tested line 2 at the position of a selected transmitting point on the tested line 2, wherein the known characteristics comprise the waveform, the frequency, the amplitude and the like of the first step signal; the fault point 21 in the line is monitored in real time through the continuously transmitted first step signal, and the real-time safety of the power distribution system is ensured.
In step S102, since the first step signal encounters the fault point 21 in the tested line 2 and the fault point 21 generates an impedance change in the line, a part of the second step signal in the first step signal is reflected at the fault occurrence point, and another part of the first step signal is still transmitted along the tested line 2, the second step signal is a signal obtained by superimposing the characteristic reflection of the fault point 21 on the first step signal, and the second step signals reflected by the fault points 21 of different fault types are different, so that the fault type can be determined by analyzing the second step signal.
In step S103, by comparing and analyzing the characteristics of the reflected second step signal and the emitted first step signal, it can be analyzed which fault type of fault point 21 the second step signal belongs to after the first step signal overlaps the characteristics of the fault point 21, so as to realize rapid fault type determination.
The characteristic comparison analysis of the first step signal and the second step signal can be displayed through a display screen of the signal processor, so that the characteristic analysis is visualized fully, and the research on the determination of the position of the fault point 21 of the experimental property is facilitated.
In step S104, the location of the fault point 21 of the preset fault type is determined by determining the fault type of the fault point 21 in step S103, which is beneficial to quickly overhaul and troubleshoot the fault point 21 of the preset fault type, and ensures the safety of the power distribution environment. Specifically, since the fault type of the fault point 21 is already determined in step S103, the fault type threatening the line safety, that is, the preset fault type is discriminated, and the position of the fault point 21 is accurately determined by calculating the distance between the preset fault type fault point 21 and the first-step signal transmission point.
It is worth mentioning that the preset fault type is a fault which affects the safety of the line, for example, a fault arc, a residual current and the like can directly cause the fire hazard and other dangers of the line, so that the preset fault type is convenient for rapidly checking and repairing the preset fault type, and the safety of the line is ensured.
It is worth mentioning that a plurality of fault points 21 existing in the line to be tested all reflect the transmitted first step signals, some of the fault points 21 threaten the safety of the line, and some of the fault points do not threaten the line, and the part is also inherent faults existing in the line and does not need to be overhauled, so that a plurality of reflected second step signals exist, and the second step signals do not need to position the fault points 21 each, and only the fault points 21 existing in the line to be tested and threatening the safety of the line to be tested need to be examined and overhauled, so that the analyzed second step signals are the characteristics of fault waveform signals which are superimposed and harmful to the line, and the positions of the fault points 21 which judge the preset fault types need to be accurately positioned so as to be further overhauled. Moreover, the resistance change of the fault point 21 which does not threaten the safety in the line is basically very small, so that the reflected second step signal has very small change compared with the first step signal and is easy to judge; and the fault point 21 which threatens the safety of the line in the line has basically large resistance change, so that the transmitted second step signal has large change compared with the first step signal, and is easy to judge.
Optionally, the first step signal may be a square wave or a sine wave, and has a preset frequency and amplitude; the first step signal is selected to be a square wave or a sine wave, the frequency and the amplitude of the first step signal are known, the waveform characteristics of which fault type the second step signal of the first step signal superposed fault point 21 belongs to can be rapidly judged, the position of the fault point 21 of the preset fault type is rapidly and accurately calculated, the fault point 21 is overhauled and maintained, and the safety factor of a power distribution system is improved.
The square wave and the sine wave selected by the first step signal have waveforms with good regularity, and after meeting the fault point 21, the second step signal overlapping the characteristics of the fault point 21 can also have waveforms with good regularity, so that the analysis of the characteristics of the second step signal is facilitated, and the fault type of the waveform characteristics of the fault overlapped by the second step signal is accurately and quickly judged.
It should be noted that, when the first-step signal propagates through a homogeneous medium, the propagation speed is not changed, and the relationship between the propagation speed V, the distance L from the fault point 21 to the first-step signal transmission point, and the time T taken for transmitting the first-step signal until the reflected second-step signal returns to the transmission point is V2L/T, and when the propagation speed of the step signal is known, the distance from the fault point to the transmission point is calculated based on the recorded times for transmitting the first-step signal and reflecting the second-step signal.
Optionally, comparing the characteristics of the first step signal and the second step signal means that the fault type of the fault point 21 is determined according to the waveform change of the second step signal by comparing the waveform characteristics of the first step signal and the second step signal.
Specifically, it is possible to quickly determine what type of fault waveform characteristic is superimposed on the waveform of the second step signal based on the waveform characteristics of the first step signal and the second step signal, thereby realizing accurate determination of the fault type at the fault point 21.
The waveform characteristics comprise time domain characteristics, frequency domain characteristics, amplitude characteristics and the like, and accurate judgment of the fault type of the fault point 21 is realized by judging a plurality of characteristics of the waveform.
The method comprises the steps that through a large number of experiments, under the condition that fault types are known, the waveform characteristics of first step signals with preset frequency characteristics are stored, and preset second step signals with different fault types are superposed; that is, after the second step signal is received, the stored waveform of the preset second step signal can be directly compared with the received second step signal, so that the fault type of the fault point 21 can be judged.
Optionally, the fault types include short circuit, open circuit and resistance change.
The common dangerous fault types in the lines such as short circuit, open circuit and resistance change are set as preset fault types, and when the second step signal is judged to be the first step signal superposed with the waveform characteristics of the preset fault types by comparing the waveforms of the first step signal and the second step signal, the position of the second step signal is determined, the fault point 21 is further overhauled, and the safety of the power distribution environment is ensured.
It is worth mentioning that the resistance change includes resistance changes caused by fault arcs and residual currents. The relatively common resistance arc of circuit fault is mainly caused by fault arc and residual current, also is the common fault with great harm in the existing circuit, therefore the resistance change that fault arc and residual current cause sets up to preset fault type, also needs to confirm the position to this fault type, overhauls and maintains.
Alternatively, the position of the fault point 21 of the preset fault type is determined, and the distance between the transmitting point of the first-step signal and the fault point 21 is calculated by calculating the time and the transmission speed for transmitting the first-step signal to the fault point 21.
Example two
Fig. 2 is a circuit diagram of a second embodiment of the present invention, which provides a method for locating and monitoring a line fault of a power distribution system.
As shown in fig. 2, a line fault location monitoring method of a power distribution system provided in the second embodiment of the present invention is different from the first embodiment in that: the tested line 2 comprises L, N phase terminals, and the first step signals are respectively emitted at the L, N phase terminals of the tested line 2, and the reflected second step signals are respectively received at the L, N phase terminals of the tested line 2.
The L, N phase terminals of the tested line 2 respectively emit first step signals, the L, N phase terminals of the tested line 2 respectively receive reflected second step signals, and the first step signals and the second step signals at the L, N phase terminals are analyzed and compared, so that the position of the fault point 21 can be more accurately judged, and the interference caused by factors such as the load 22 existing in the tested line 2 on the judgment of the position of the fault point 21 is avoided.
Specifically, the L-phase end of the line 2 under test continuously sends out a first step signal, and the second step signal is reflected at the fault reflection point in the line 2 under test, and the second step signal does not pass through the load 22; a first step signal continuously emitted from the N-phase end of the line 2 under test, a second step signal reflected at a fault reflection point in the line 2 under test, and the second step signal passes through the load 22; the L, N phase lines of the tested line 2 are respectively measured at the fault point 21, and the interference of the load 22 existing in the tested line 2 on the monitoring is avoided.
Wherein, because the fault point 21 may be on the L line or N line, if only one group is used to receive the signaling, the signal will pass through the load 22 end and will be affected by the change of the load 22, so that the two ends of the L line or N line are measured separately, and the interference from the load 22 is avoided.
EXAMPLE III
Fig. 3 is a circuit diagram of a method for locating and monitoring a line fault of a power distribution system according to a third embodiment of the present invention.
As shown in fig. 3, a line fault location monitoring method of a power distribution system provided in the third embodiment of the present invention is different from the first embodiment in that: comparing the characteristics of the first step signal and the second step signal, determining the position of the fault arc monitored by the phase line L, N after judging the fault type to be the fault arc, and judging the fault arc to be a series arc or a parallel arc.
Specifically, a first step signal is respectively transmitted at one end of L, N phase lines of the tested line 2, and a reflected second step signal is respectively received at one end of L, N phase lines of the tested line 2; respectively judging the fault type of the fault point 21 by comparing the waveform characteristics of the second step signal reflected after the first step signal is superposed on the fault point 21, determining that the fault type of the fault point 21 is a fault arc, and then calculating the distances from the fault point 21 to the emission points at one end of L, N phase lines, wherein if the distances from the fault point 21 to the emission points at one end of L, N phase lines are equal, the fault point 21 is a parallel fault arc, and if the distances from the fault point 21 to the emission points at one end of L, N phase lines are unequal, the fault point 21 is a series fault arc.
Specifically, because the positions of the occurrence point of the parallel fault arc and the end points of the two transmission points of the L, N phase line are symmetrical, the monitored distance between the fault point 21 and the two transmission points of the L, N phase line is basically the same; since the point of occurrence of the series fault arc is asymmetric with respect to the two transmission points of the L, N phase line, the monitored fault point 21 is at a different distance from the two transmission points of the L, N phase line.
Example four
Fig. 4 is a circuit diagram of a line fault location monitoring device 1 of a power distribution system according to a fourth embodiment of the present invention.
As shown in fig. 4, the present invention provides a line fault location monitoring device 1 of a power distribution system, which includes an integrated signal transmitting module 11, a signal receiving module 12, a comparing module 13 and a calculating module 14;
the power distribution system line fault positioning and monitoring device 1 is used for being installed on a line to be tested;
the signal transmitting module 11 is configured to continuously transmit a first step signal to a line to be tested;
the signal receiving module 12 is configured to receive a second step signal reflected after the first step signal meets a fault point 21 in the tested line 2;
the comparison module 13 is configured to compare characteristics of the first step signal and the second step signal;
the calculation module 14 is configured to calculate a position of the fault point 21 of a preset fault type.
Specifically, a first step signal is continuously transmitted to the line to be tested through the integrated signal transmitting module 11, a second step signal reflected after the first step signal meets the fault point 21 is received through the signal receiving module 12, the type of the fault point 21 is judged through the comparison module 13 for comparing and analyzing the characteristics of the first step signal and the second step signal, and finally the position of the fault point 21 with the preset fault type is calculated through the calculating module 14, so that the fault point 21 existing in the line to be tested is accurately positioned.
The fault locating and monitoring device comprises a power distribution system line fault locating and monitoring device 1, a fault detecting device and a fault analyzing device, wherein the power distribution system line fault locating and monitoring device 1 is installed on a line to be detected, so that faults existing in the line to be detected are monitored in real time, and the real-time safety of the line to be detected is guaranteed; the power distribution system line fault positioning and monitoring device 1 is composed of a signal transmitting module 11, a signal receiving module 12, a comparison module 13 and a calculation module 14 which are integrated into a whole, the power distribution system line fault positioning and monitoring device 1 is directly installed on a line to be detected, real-time monitoring is guaranteed, a first step signal is transmitted and a second step signal is received at the same position, and analysis of the position of a fault point 21 is facilitated.
It should be mentioned that the first-step signal transmitted by the signal transmitting module 11 can select the parameter information of the continuously transmitted first-step signal through the power distribution system line fault positioning monitoring device, and can select the parameters such as the time interval for transmitting the first-step signal, so as to ensure the best monitoring effect on the fault point 21 in the line to be detected, and facilitate the subsequent analysis and comparison operation.
In summary, the method and the device for locating and monitoring the line fault of the power distribution system provided by the invention have the beneficial effects that: firstly, a first step signal is transmitted to a tested line 2, and because the first step signal meets a fault arc in the tested line 2, the fault arc generates impedance change in the line, so that part of a second step signal is reflected at a fault point 21, and the time parameter is calculated by comparing the characteristics of the reflected second step signal and the transmitted first step signal, the position of the fault point 21 is calculated by the time parameter and the transmission speed, the fault point 21 is accurately and quickly positioned, and the fault arc monitoring technology is improved.
The above description is only an example of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and the present invention shall be covered thereby. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for positioning and monitoring line faults of a power distribution system is characterized by comprising the following steps:
continuously transmitting a first-step signal to a tested line;
receiving a second step signal, wherein the second step signal is a reflected signal after the first step signal meets a fault point in the tested line;
comparing the characteristics of the first step signal and the second step signal, and judging the fault type of the fault point;
and determining the position of a fault point of a preset fault type.
2. The electrical distribution system line fault location monitoring method of claim 1, wherein the first step signal is a square wave or a sine wave, and the square wave or the sine wave has a predetermined frequency and amplitude.
3. The electrical distribution system line fault location monitoring method of claim 1, wherein comparing the characteristics of the first step signal and the second step signal means comparing the waveform characteristics of the first step signal and the second step signal and determining the fault type of the fault point according to the waveform change of the second step signal.
4. The electrical distribution system line fault location monitoring method of claim 1, wherein the fault types include short circuits, open circuits, and changes in resistance.
5. The electrical distribution system line fault location monitoring method of claim 4, wherein the change in resistance comprises a change in resistance caused by a fault arc and a residual current.
6. The electrical distribution system line fault location monitoring method of claim 1, wherein the location of the fault point of the predetermined fault type is determined, and the distance between the transmission point transmitting the first step signal and the fault point is calculated by calculating the time and transmission speed of transmitting the first step signal to the fault point.
7. The electrical distribution system line fault location monitoring method of claim 1, wherein a first step signal is transmitted at one end of L, N phase lines of the line under test, and a reflected second step signal is received at one end of L, N phase lines of the line under test.
8. The electrical distribution system line fault location monitoring method of claim 7, wherein after comparing the characteristics of the first step signal and the second step signal to determine the fault type as a fault arc,
and respectively determining the position of the fault arc monitored by the L, N phase line, and judging whether the fault arc is a series arc or a parallel arc.
9. A power distribution system line fault positioning and monitoring device is characterized by comprising a signal transmitting module, a signal receiving module, a comparison module and a calculation module which are integrated into a whole;
the power distribution system line fault positioning and monitoring device is used for being installed on a line to be tested;
the signal transmitting module is used for continuously transmitting a first-step signal to a line to be detected;
the signal receiving module is used for receiving a first step signal and a second step signal reflected after a fault point in a tested line meets the first step signal;
the comparison module is used for comparing the characteristics of the first step signal and the second step signal;
the calculation module is used for calculating the position of the fault point of the preset fault type.
10. The electrical distribution system line fault location monitoring device of claim 9, wherein the number of electrical distribution system line fault location monitoring devices is two;
and the two power distribution system line fault positioning and monitoring devices are respectively arranged on L, N phase lines of a line to be tested.
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| CN202010525251.7A CN112763840B (en) | 2020-06-10 | 2020-06-10 | Method and device for positioning and monitoring line fault of power distribution system |
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| CN202010525251.7A CN112763840B (en) | 2020-06-10 | 2020-06-10 | Method and device for positioning and monitoring line fault of power distribution system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0072882A1 (en) * | 1981-08-20 | 1983-03-02 | Maxwell Laboratories, Inc. | Fault locating system for electric cables and the like |
| WO2005038473A1 (en) * | 2003-10-20 | 2005-04-28 | Orton Harry E | Method and system for diagnosing degradation in vehicle wiring |
| US20110169498A1 (en) * | 2008-09-22 | 2011-07-14 | Adrian Shipley | Arc fault location detection for aircraft wiring |
| CN103592550A (en) * | 2013-11-26 | 2014-02-19 | 华侨大学 | Arc fault detection method and protection device |
| CN105334425A (en) * | 2014-06-13 | 2016-02-17 | 益而益(集团)有限公司 | Arc fault detection apparatus |
| CN105553422A (en) * | 2015-12-31 | 2016-05-04 | 西安交通大学 | Photovoltaic system fault arc detection method combining multiple detection signals |
-
2020
- 2020-06-10 CN CN202010525251.7A patent/CN112763840B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0072882A1 (en) * | 1981-08-20 | 1983-03-02 | Maxwell Laboratories, Inc. | Fault locating system for electric cables and the like |
| WO2005038473A1 (en) * | 2003-10-20 | 2005-04-28 | Orton Harry E | Method and system for diagnosing degradation in vehicle wiring |
| US20110169498A1 (en) * | 2008-09-22 | 2011-07-14 | Adrian Shipley | Arc fault location detection for aircraft wiring |
| CN102159956A (en) * | 2008-09-22 | 2011-08-17 | 通用电气航空系统有限公司 | Arc fault location detection for aircraft wiring |
| CN103592550A (en) * | 2013-11-26 | 2014-02-19 | 华侨大学 | Arc fault detection method and protection device |
| CN105334425A (en) * | 2014-06-13 | 2016-02-17 | 益而益(集团)有限公司 | Arc fault detection apparatus |
| CN105553422A (en) * | 2015-12-31 | 2016-05-04 | 西安交通大学 | Photovoltaic system fault arc detection method combining multiple detection signals |
Non-Patent Citations (3)
| Title |
|---|
| EDWIN CALDERON-MENDOZA等: "《A double ended AC series arc fault location algorithm for a low-voltage indoor power line using impedance parameters and a neural network》", 《ELECTRIC POWER SYSTEMS RESEARCH》 * |
| 吴春华等: "《基于SSTDR的光伏系统直流母线电弧故障在线检测与定位》", 《中国电机工程学报》 * |
| 王一闻等: "《基于TDR的故障电弧定位技术研究》", 《电器与能效管理技术》 * |
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