CN112564034A - Fault judgment method and system for diversified grounding mode of distribution network line - Google Patents
Fault judgment method and system for diversified grounding mode of distribution network line Download PDFInfo
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- 238000004088 simulation Methods 0.000 claims abstract description 69
- 238000003745 diagnosis Methods 0.000 claims abstract description 12
- 238000004891 communication Methods 0.000 claims description 17
- 230000003993 interaction Effects 0.000 claims description 8
- 230000007935 neutral effect Effects 0.000 claims description 8
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- 230000002159 abnormal effect Effects 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000010891 electric arc Methods 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
- H02H3/162—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass for ac systems
- H02H3/165—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass for ac systems for three-phase systems
Abstract
The invention belongs to the technical field of power grid fault diagnosis, and particularly relates to a fault judgment method for a diversified grounding mode of a distribution network line. According to the invention, the A-phase fault recorder, the B-phase fault recorder and the C-phase fault recorder are respectively installed in the A-phase line, the B-phase line and the C-phase line, so that the current values of the A-phase line, the B-phase line and the C-phase line can be respectively obtained, then the current values respectively obtained by the A-phase line, the B-phase line and the C-phase line are compared and analyzed with the current value preset by the real-time simulation device, and the faults of the A-phase line, the B-phase line and the C-phase line can be rapidly judged, so that the technical problems of insufficient accuracy and low efficiency of fault diagnosis in a traditional distribution network line diversified grounding mode are effectively solved.
Description
Technical Field
The invention relates to the technical field of power grid fault diagnosis, in particular to a fault judgment method and a fault judgment system for a diversified grounding mode of a distribution network line.
Background
In the initial stage of China, a 10-66 kV distribution network basically imitates the former Soviet Union mode, namely, a non-grounding or arc suppression coil grounding mode is adopted. However, in the later 90 s, with the development of power distribution networks, many cities in China began to adopt a mode that a neutral point is grounded through a small resistor. At present, the modes of ungrounded, grounded through an arc suppression coil and grounded through a small resistor coexist in a power distribution network system in China.
Neutral point ungrounded mode: the method is mainly applied to a power distribution network with an overhead line as a line type, and is suitable for the condition that the single-phase earth fault capacitance current is less than 10A. The methodSimple and economic, easy to find out fault line, when single-phase short circuit occurs, the operation condition of ungrounded power grid will change greatly, and the voltage to earth of sound phase rises to original value
The voltages among the three phases are still basically in an equilibrium state, and the symmetry of the system is not damaged. The method has the disadvantages that the method has the problem of easy occurrence of resonance overvoltage, when the short-circuit current reaches more than 30A, the power grid generates stable electric arc at the fault position, the arc grounding is further caused, the arc can be kept continuously, the strong electric arc can cause the damage of equipment, and two-phase short circuit or three-phase short circuit can be caused.
The neutral point is grounded through an arc suppression coil (also called as a resonance grounding mode): the mode is simple to operate and manage, the occurrence probability of intermittent arc grounding overvoltage can be reduced, overvoltage generated due to saturation of the iron core of the voltage transformer is eliminated, the occurrence and the expansion of cable faults are limited, fault lines are easy to find, the capacitance current is changed along with the system with large or frequent operation mode change, and automatic tracking compensation can be realized by automatically changing the inductance value. The method has the disadvantages that the price of the arc suppression coil is higher, the capacitance current is continuously increased along with the construction of a power grid and the increase of circuits, the arc suppression coil equipment needs to be continuously updated, and the investment is larger; for a power distribution network with large capacitance current, a lot of inadaptability appears in engineering practice, and the method is worthy of study.
The neutral point is grounded through a small resistor: the neutral point grounded through the resistor is divided into high-resistance, medium-resistance and low-resistance grounds according to the difference of limiting the magnitude of the ground fault current, wherein the low-resistance ground is the most common ground and is generally called as small-resistance ground. The mode is suitable for medium-voltage power grids with the line type mainly including cables and rarely having transient single-phase earth faults, and meanwhile, the system is high in capacitance and current, strong and reasonable in grid structure and high in automation level. Can reduce power frequency overvoltage, effectively restrict arc light ground connection overvoltage, and the security is high. The fault current is very large when single-phase earth fault occurs, the interference to communication and electronic equipment is large, and the comprehensive investment is relatively high.
At present, when the traditional diversified grounding mode of the distribution network line is diagnosed, a breaker at an outlet of a distribution network feeder line is tripped basically through manual line patrol, namely after relay protection action of the distribution network line, power line patrol personnel is informed to try to find the position of a fault along the tripped distribution line manually, the diagnosis mode is low in efficiency and insufficient in fault diagnosis accuracy, and in order to solve the problems, the invention provides a fault judgment method and a fault judgment system for the diversified grounding mode of the distribution network line.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a fault judgment method and a fault judgment system aiming at a diversified grounding mode of a distribution network line, and solves the problems of low efficiency and insufficient fault diagnosis accuracy of the traditional diversified grounding mode of the distribution network line during diagnosis.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a fault judgment method aiming at a diversified grounding mode of a distribution network line is characterized by comprising the following steps: the method comprises the following steps:
s1, firstly, establishing a working state of a real-time simulation device for simulating a distribution network line ground fault, wherein the distribution network line comprises an A-phase line, a B-phase line and a C-phase line;
s2, respectively acquiring current values of the A-phase line, the B-phase line and the C-phase line through the A-fault wave recorder, the B-fault wave recorder and the C-fault wave recorder;
s3, respectively sending the current values obtained by the phase A line, the phase B line and the phase C line to a real-time simulation device through a communication module according to the step S2;
and S4, finally, performing numerical analysis by the real-time simulation device according to the current values sent in the step S3, and performing fault judgment on the A-phase line, the B-phase line and the C-phase line respectively.
As a preferred embodiment of the present invention, in step S1, the a-phase line is grounded through a neutral point, the B-phase line is grounded through an arc suppression coil, and the C-phase line is grounded through a small resistor.
As a preferred technical solution of the present invention, the real-time simulation device in step S1 includes a simulation workstation, the simulation workstation constructs the real-time simulation device for simulating the distribution network line, and the simulation workstation presets the fault parameters of the wiring of the phase a line, the phase B line, and the phase C line, respectively.
As a preferred technical scheme of the invention, the simulation workstation is provided with a human-computer interaction display interface which can display the running state, waveform and the like of the ground fault of the simulation power grid in the grounding of the distribution network line, and specifically, the real-time simulation device sends the running parameters (such as current and voltage), waveform and other information of the simulated power grid which is simulated and simulated when the fault occurs to the simulation workstation, and the information is displayed through the simulation workstation, thereby being beneficial to the human-computer interaction step.
As a preferred technical scheme of the invention, the fault parameter is a preset current value, and can be compared with current values in an A-phase line, a B-phase line and a C-phase line respectively, so that the fault of the power distribution network line can be conveniently judged.
As a preferred technical solution of the present invention, the performing a numerical analysis on the current values collected by the a-phase line, the B-phase line, and the C-phase line respectively through a real-time simulation device in step S4 to perform a fault determination includes: and judging whether current abnormal data sent by the online communication module is received or not by the real-time simulation device, if so, judging the magnitude of a current value in the current abnormal data to be compared with a preset current value, and if the current value is larger than the preset current value, determining the current power distribution network line ground fault.
The invention also provides a fault judgment system aiming at the diversified grounding mode of the distribution network line, which comprises a simulation workstation, a real-time simulation device, a communication module, an A fault recorder, a B fault recorder, a C fault recorder, an A phase line, a B phase line and a C phase line, wherein the output end of the simulation workstation is electrically connected with the input end of the real-time simulation device, the output end of the real-time simulation device is electrically connected with the input end of the communication module, the input end of the communication module is respectively and electrically connected with the output ends of the A fault recorder, the B fault recorder and the C fault recorder, and the input ends of the A phase line, the B phase line and the C phase line are electrically connected with the output end of the real-time simulation device.
As a preferred technical scheme of the invention, the A fault oscillograph, the B fault oscillograph and the C fault oscillograph are respectively installed in the A phase line, the B phase line and the C phase line, so that the current values of the A phase line, the B phase line and the C phase line can be conveniently obtained.
(III) advantageous effects
Compared with the prior art, the invention provides a fault judgment method and a fault judgment system aiming at a diversified grounding mode of a distribution network line, and the fault judgment method and the fault judgment system have the following beneficial effects:
according to the fault judgment method and system for the diversified grounding mode of the distribution network line, the A fault recorder, the B fault recorder and the C fault recorder are respectively installed in the A phase line, the B phase line and the C phase line, the current values of the A phase line, the B phase line and the C phase line can be respectively obtained, then the current values respectively obtained by the A phase line, the B phase line and the C phase line are compared and analyzed with the current value preset by the real-time simulation device, and the faults of the A phase line, the B phase line and the C phase line can be quickly judged, so that the technical problems that the fault diagnosis accuracy is insufficient and the efficiency is low in the diversified grounding mode of the traditional distribution network line are effectively solved, a more accurate fault diagnosis method is provided, and accurate fault judgment and equipment cost reduction are further achieved.
Drawings
Fig. 1 is a schematic flowchart of a fault determination method for a diversified grounding manner of a distribution network line according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a fault determination system for a diversified grounding manner of a distribution network line according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the 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.
Examples
Referring to fig. 1-2, the present invention provides the following technical solutions: a fault judgment method for a diversified grounding mode of a distribution network line comprises the following steps:
s1, firstly, establishing a working state of a real-time simulation device for simulating a distribution network line ground fault, wherein the distribution network line comprises an A-phase line, a B-phase line and a C-phase line;
s2, respectively acquiring current values of the A-phase line, the B-phase line and the C-phase line through the A-fault wave recorder, the B-fault wave recorder and the C-fault wave recorder;
s3, respectively sending the current values obtained by the phase A line, the phase B line and the phase C line to a real-time simulation device through a communication module according to the step S2;
and S4, finally, performing numerical analysis by the real-time simulation device according to the current values sent in the step S3, and performing fault judgment on the A-phase line, the B-phase line and the C-phase line respectively.
Specifically, in step S1, the phase a circuit is grounded through an arc suppression coil, the phase B circuit is grounded through a neutral point, and the phase C circuit is grounded through a small resistor.
Specifically, the real-time simulation device in step S1 includes a simulation workstation, the simulation workstation constructs the real-time simulation device for simulating the distribution network line, and the simulation workstation presets the fault parameters of the a-phase line, the B-phase line, and the C-phase line connection.
Specifically, the simulation workstation is provided with a human-computer interaction display interface, the human-computer interaction display interface can display the running state, the waveform and the like of the ground fault of the simulation power grid in the grounding of the distribution network line, specifically, the real-time simulation device sends the running parameters (such as current and voltage), the waveform and other information of the simulation power grid simulated by simulation to the simulation workstation, and the information is displayed through the simulation workstation, so that the human-computer interaction step is facilitated.
Specifically, the fault parameter is a preset current value, and can be compared with current values in the phase-A line, the phase-B line and the phase-C line respectively, so that the fault of the power distribution network line can be conveniently judged.
Specifically, in step S4, the current values collected by the a-phase line, the B-phase line, and the C-phase line are subjected to numerical analysis by the real-time simulation device, and fault determination is performed, including: and judging whether current abnormal data sent by the online communication module is received or not by the real-time simulation device, if so, judging the magnitude of a current value in the current abnormal data to be compared with a preset current value, and if the current value is larger than the preset current value, determining the current power distribution network line ground fault.
The invention also provides a fault judgment system aiming at the diversified grounding mode of the distribution network line, which comprises a simulation workstation, a real-time simulation device, a communication module, an A fault recorder, a B fault recorder, a C fault recorder, an A phase line, a B phase line and a C phase line, wherein the output end of the simulation workstation is electrically connected with the input end of the real-time simulation device, the output end of the real-time simulation device is electrically connected with the input end of the communication module, the input end of the communication module is respectively and electrically connected with the output ends of the A fault recorder, the B fault recorder and the C fault recorder, and the input ends of the A phase line, the B phase line and the C phase line are electrically connected with the output end of the real-time simulation device.
Specifically, the A fault oscillograph, the B fault oscillograph and the C fault oscillograph are respectively installed in the A phase line, the B phase line and the C phase line, so that current values of the A phase line, the B phase line and the C phase line can be conveniently obtained.
The invention can respectively acquire the current values of the A-phase line, the B-phase line and the C-phase line by respectively installing the A-phase fault recorder, the B-phase fault recorder and the C-phase fault recorder in the A-phase line, the B-phase line and the C-phase line, can upload the acquired current values of the A-phase line, the B-phase line and the C-phase line to a real-time simulation device under the use of a communication module, and the real-time simulation device respectively compares and analyzes the current values acquired by the A-phase line, the B-phase line and the C-phase line through preset current values, can quickly judge the faults of the A-phase line, the B-phase line and the C-phase line, improves the efficiency of the diversified grounding mode of the distribution network line in fault judgment, and further effectively solves the technical problems of insufficient fault diagnosis accuracy and low efficiency of the diversified grounding mode of the traditional distribution network line, therefore, a more accurate fault diagnosis method is provided, and further accurate fault judgment is achieved and equipment cost is reduced.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A fault judgment method aiming at a diversified grounding mode of a distribution network line is characterized by comprising the following steps: the method comprises the following steps:
s1, firstly, establishing a working state of a real-time simulation device for simulating a distribution network line ground fault, wherein the distribution network line comprises an A-phase line, a B-phase line and a C-phase line;
s2, respectively acquiring current values of the A-phase line, the B-phase line and the C-phase line through the A-fault wave recorder, the B-fault wave recorder and the C-fault wave recorder;
s3, respectively sending the current values obtained by the phase A line, the phase B line and the phase C line to a real-time simulation device through a communication module according to the step S2;
and S4, finally, performing numerical analysis by the real-time simulation device according to the current values sent in the step S3, and performing fault judgment on the A-phase line, the B-phase line and the C-phase line respectively.
2. The fault judgment method for the diversified grounding mode of the distribution network line according to claim 1, characterized in that: in step S1, the phase a circuit is grounded through an arc suppression coil, the phase B circuit is grounded through a neutral point, and the phase C circuit is grounded through a small resistor.
3. The fault judgment method for the diversified grounding mode of the distribution network line according to claim 1, characterized in that: the real-time simulation device in the step S1 includes a simulation workstation, the simulation workstation constructs the real-time simulation device for simulating the distribution network line, and the simulation workstation presets the fault parameters of the a-phase line, the B-phase line, and the C-phase line connection, respectively.
4. The fault judgment method for the diversified grounding mode of the distribution network line according to claim 2, characterized in that: the simulation workstation is provided with a human-computer interaction display interface, the human-computer interaction display interface can display the running state, the waveform and the like of the ground fault of the simulation power grid in the grounding of the distribution network line, specifically, the real-time simulation device sends the running parameters (such as current and voltage), the waveform and other information of the simulation power grid simulated by simulation to the simulation workstation, and the information is displayed through the simulation workstation, so that the human-computer interaction step is facilitated.
5. The fault judgment method for the diversified grounding mode of the distribution network line according to claim 3, characterized in that: the fault parameters are preset current values, and can be compared with current values in the A-phase line, the B-phase line and the C-phase line respectively, so that the fault of the power distribution network line can be conveniently judged.
6. The fault judgment method for the diversified grounding mode of the distribution network line according to claim 1, characterized in that: in step S4, the current values collected by the phase a line, the phase B line, and the phase C line are subjected to numerical analysis by the real-time simulation device, and fault determination is performed, including: and judging whether current abnormal data sent by the online communication module is received or not by the real-time simulation device, if so, judging the magnitude of a current value in the current abnormal data to be compared with a preset current value, and if the current value is larger than the preset current value, determining the current power distribution network line ground fault.
7. The utility model provides a fault diagnosis system to distribution network line pluralism ground connection mode which characterized in that: including the emulation workstation, real-time simulation device, communication module, A trouble oscillograph, B trouble oscillograph, C trouble oscillograph, A looks circuit, B looks circuit and C looks circuit, the output of emulation workstation and real-time simulation device's input electric connection, real-time simulation device's output and communication module's input electric connection, communication module's input respectively all with A trouble oscillograph, the output electric connection of B trouble oscillograph and C trouble oscillograph, A looks circuit, the input of B looks circuit and C looks circuit all with real-time simulation device's output electric connection.
8. The system according to claim 7, wherein the system comprises: the A fault oscillograph, the B fault oscillograph and the C fault oscillograph are respectively installed in the A phase line, the B phase line and the C phase line, and current values of the A phase line, the B phase line and the C phase line are conveniently obtained.
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2020
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Application publication date: 20210326 |