CN108254654B - Method and device for diagnosing fault line in multi-phase circuit - Google Patents
Method and device for diagnosing fault line in multi-phase circuit Download PDFInfo
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- CN108254654B CN108254654B CN201611239217.3A CN201611239217A CN108254654B CN 108254654 B CN108254654 B CN 108254654B CN 201611239217 A CN201611239217 A CN 201611239217A CN 108254654 B CN108254654 B CN 108254654B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- 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
Abstract
The embodiment of the invention discloses a method for diagnosing a fault line in a multi-phase circuit, which comprises the steps of calculating the corresponding voltage unbalance and/or current unbalance of each phase of power transmission line by utilizing current data and/or voltage data of each phase of power transmission line in the multi-phase circuit; and when the voltage unbalance and/or the current unbalance exceed the preset threshold, judging that the corresponding line has a fault. The technical scheme of the application can simply, quickly and accurately judge the line which is likely to have faults, monitor or maintain the line, avoid the line from having faults to a certain extent and ensure the normal operation of each phase of power transmission line; when a fault occurs, the fault line can be quickly positioned, so that the fault line can be quickly maintained, the normal operation of a power distribution system is ensured to a certain extent, and the safety of the power distribution system is improved. In addition, the embodiment of the invention also provides a corresponding implementation device, so that the method has higher practicability and the device has corresponding advantages.
Description
Technical Field
The present invention relates to the field of power monitoring, and in particular, to a method and apparatus for diagnosing a faulty line in a multi-phase circuit.
Background
Due to the rapid development of the power industry, the single-phase circuit and the two-phase circuit cannot meet the market demand, and the multi-phase circuit is produced accordingly. In the multi-phase circuit, in consideration of cost, material and performance, a three-phase circuit (a circuit powered by a three-phase alternating current power supply) is widely applied to a civil power supply system, and more phase circuits are only applied to special fields due to higher cost and complex structure.
At least three-phase power supply is required to generate a rotating magnetic field without using auxiliary equipment; the three-phase generator with the same size has higher power than a single-phase generator, and the torque of the generator is constant under the condition that three-phase loads are the same, so that the work of the generator is facilitated; the three-phase system saves transmission lines compared with a single-phase system, and the three-phase transformer is more economical than the single-phase transformer; the three-phase power easily generates a rotating magnetic field to enable the three-phase motor to stably rotate; the three-phase circuit is also a source of power in the field of power systems due to its high efficiency, low cost, high power, simple construction and good stability.
In a power distribution system of a three-phase circuit and a multi-phase circuit, because the circuit is complex, when a certain circuit fails, the failed circuit is difficult to detect from a plurality of circuits in a short time, and the failed circuit cannot be quickly repaired, so that the normal operation of the power distribution system is influenced; in severe cases, the entire power distribution system may fail, which may cause inconvenience to users.
In the operation process of the multi-phase circuit, each phase circuit is monitored in real time, the line which is possibly faulted in each phase circuit is judged quickly and accurately, then the circuit which is possibly faulted is monitored or maintained in advance if necessary, the line is prevented from being faulted to a certain extent, and the normal operation of each phase of power transmission line is ensured; even if a fault occurs, the fault line can be quickly positioned, so that the fault line can be quickly repaired, the normal operation of the power distribution system is ensured to a certain extent, and the safety of the power distribution system is improved. It can be seen that how to accurately determine a line that may have a fault during the operation of a multi-phase circuit is a problem to be urgently solved by those skilled in the art.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for diagnosing a fault line in a multi-phase circuit, which can accurately judge a line which is possibly faulted in the running process of the multi-phase circuit, ensure the normal running of each phase of power transmission line and the normal running of a power distribution system to a certain extent, and improve the safety of the power distribution system.
In order to solve the above technical problem, the embodiments of the present invention provide the following technical solutions:
an embodiment of the present invention provides a method for diagnosing a faulty line in a multi-phase circuit, including:
acquiring current data and/or voltage data of each phase of power transmission line in a multi-phase circuit;
calculating the corresponding voltage unbalance and/or current unbalance of each phase of power transmission line according to the current data and/or the voltage data;
comparing each of the voltage unbalances and/or the current unbalances with a preset threshold;
and when the voltage unbalance and/or the current unbalance exceed the preset threshold, judging that the corresponding line has a fault.
Preferably, the preset threshold is 5%.
Preferably, after the calculating the corresponding voltage imbalance and/or current imbalance of each phase of the power transmission line according to each piece of the current data and/or the voltage data, the method further includes:
and displaying the calculated voltage unbalance degree and/or current unbalance degree of each phase of power transmission line.
Preferably, after determining that the corresponding line has a fault when the voltage imbalance degree and/or the current imbalance degree exceeds the preset threshold, the method further includes:
and prompting the fault line according to the judgment result.
Preferably, when acquiring voltage data of each phase of power transmission line in the multi-phase circuit, the calculating a corresponding voltage imbalance and/or current imbalance of each phase of power transmission line according to each current data and/or the voltage data includes:
calculating an average voltage of the multi-phase circuit:
calculating the voltage balance degree corresponding to each phase of power transmission line according to the average voltage and the voltage data of each phase of power transmission line:
wherein Δ U is an average voltage of the multi-phase circuit; delta epsilonUiFor voltage levelling of transmission lines of each phaseWeighing; u shapeiAnd the voltage value of each phase of power transmission line.
Preferably, when obtaining current data of each phase of power transmission line in the multi-phase circuit, the calculating a corresponding voltage imbalance and/or current imbalance of each phase of power transmission line according to each current data and/or the voltage data includes:
calculating an average current of the multi-phase circuit:
calculating the current balance degree corresponding to each phase of power transmission line according to the average current and the current data of each phase of power transmission line:
wherein Δ I is an average current of the multi-phase circuit; delta epsilonIiThe current balance degree of each phase of power transmission line is obtained; i isiThe current value of each phase of power transmission line.
Preferably, after determining that the corresponding line has a fault when the voltage imbalance and/or the current imbalance exceed the preset threshold, the method further includes:
and alarming the line with the fault.
Another aspect of the present invention provides an apparatus for diagnosing a faulty line in a multi-phase circuit, including:
the data acquisition module is used for acquiring current data and/or voltage data of each phase of power transmission line in the multi-phase circuit;
the calculation module is used for calculating the corresponding voltage unbalance and/or current unbalance of each phase of power transmission line according to the current data and/or the voltage data;
the fault diagnosis module is used for comparing each voltage unbalance degree and/or each current unbalance degree with a preset threshold value; and when the voltage unbalance and/or the current unbalance exceed the preset threshold, judging that the corresponding line has a fault.
Preferably, the method further comprises the following steps:
and the display module is used for displaying the calculated voltage unbalance and/or current unbalance of each phase of power transmission line.
Preferably, the method further comprises the following steps:
and the prompting module is used for prompting the fault line according to the judgment result.
The embodiment of the invention provides a method for diagnosing a fault line in a multi-phase circuit, which comprises the steps of calculating the corresponding voltage unbalance and/or current unbalance of each phase of power transmission line by utilizing current data and/or voltage data of each phase of power transmission line in the multi-phase circuit; and when the voltage unbalance and/or the current unbalance exceed the preset threshold, judging that the corresponding line has a fault.
The technical scheme provided by the application adopts the unbalance degree of each phase of power transmission line as a factor for measuring the line which is likely to have a fault in the operation process of the multi-phase circuit. In the operation process of a multi-phase circuit power distribution system, the phenomenon of unbalance of single-phase power transmission lines occurs due to voltage fluctuation, different loads of the single-phase power transmission lines and different power utilization time. When the voltage or current of each phase of power transmission line is too different, the power consumption is increased, and even a phase line is failed, so that the safety of the whole equipment is endangered. Therefore, when the unbalance degree of each phase of power transmission line exceeds a preset threshold value, the power transmission line can be judged to possibly have faults. By adopting the method, the power transmission line which is likely to have faults can be simply, quickly and accurately judged. When the multi-phase circuit is not in fault, the circuit which is likely to be in fault is monitored or maintained in advance if necessary, so that the circuit can be prevented from being in fault to a certain extent, and the normal operation of each phase of power transmission line is ensured; even if a fault occurs, the fault line can be quickly positioned, so that the fault line can be quickly repaired, the normal operation of a power distribution system is ensured to a certain extent, and the safety of the power distribution system is improved; when the multi-phase circuit breaks down, the method can be used for quickly positioning the range of the fault line, so that the time for searching the fault line is greatly shortened, the efficiency for maintaining the fault line is improved, and the safety of the whole power distribution system is improved.
In addition, the embodiment of the invention also provides a corresponding implementation device for the method for diagnosing the fault line in the multi-phase circuit, so that the method has higher practicability and the device has corresponding advantages.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a block diagram of an exemplary application scenario provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first embodiment of a method for diagnosing a faulty line in a multi-phase circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second embodiment of a method for diagnosing a faulty line in a multi-phase circuit according to the present invention;
FIG. 4 is a schematic diagram illustrating voltage imbalance and current imbalance according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a third embodiment of a method for diagnosing a faulty line in a multi-phase circuit according to the present invention;
FIG. 6 is a schematic diagram of a fourth embodiment of a method for diagnosing a faulty line in a multi-phase circuit according to the present invention;
FIG. 7 is a block diagram of one embodiment of an apparatus for diagnosing a faulted line in a multi-phase circuit, according to an embodiment of the present invention;
fig. 8 is a block diagram of another embodiment of a device for diagnosing a faulty line in a multi-phase circuit according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
The terms "first," "second," "third," "fourth," and the like in the description and claims of this application and in the foregoing drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may include other steps or elements not expressly listed.
In the prior art, generally, when a fault line exists in a power distribution system, the fault line is detected, positioned, repaired and maintained; because the circuit in the power distribution system of the multiphase circuit is complex, the fault circuit is difficult to position and maintain in a short time, and the normal operation of the power distribution system is influenced; in severe cases, the entire power distribution system may fail, which may cause inconvenience to users.
In view of the above, the inventor of the present application has found that, during the operation of a three-phase circuit or a multi-phase circuit power distribution system, the single-phase power transmission lines are unbalanced due to voltage fluctuation, different loads of the single-phase power transmission lines, and different power consumption times. When the voltage or current of each phase of power transmission line is too different, the power consumption is increased, and even a phase line is failed, so that the safety of the whole equipment is endangered. Therefore, the unbalance of each phase of power transmission line can be used as a factor for measuring the line which is possibly faulted in the operation process of the multi-phase circuit, and when the unbalance of each phase of power transmission line exceeds a preset threshold value, the power transmission line can be judged to be faulted, so that the faulted power transmission line can be judged simply, quickly and accurately, the line is prevented from being faulted to a certain extent, and the normal operation of each phase of power transmission line is ensured; the normal operation of the power distribution system is ensured, and the safety of the power distribution system is improved.
Based on the above technical solutions of the embodiments of the present invention, some possible application scenarios related to the technical solutions of the embodiments of the present invention are first described with reference to fig. 1, and the following explains the principle of the present application by taking diagnosis of a faulty line in a three-phase four-wire system power distribution system as an example with reference to fig. 1.
As shown in fig. 1, voltage data and current data of each phase of power transmission line in the three-phase circuit are collected through a voltmeter and an ammeter in a data collection module; sending the acquired data to an IFIX data analysis module for calculating the voltage unbalance and the current unbalance of each phase of power transmission line; and comparing the calculated values of the unbalance degrees with a preset threshold value, and judging that the corresponding line is possible to have faults when at least one unbalance degree in each line exceeds the preset threshold value. The method and the device have the advantages that the faulted line can be simply, quickly and accurately judged, the normal operation of each phase circuit is guaranteed, the normal operation of a power distribution system is guaranteed, and the safety of the power distribution system is improved.
It should be noted that the above application scenarios are only shown for facilitating understanding of the ideas and principles of the present application, and the embodiments of the present application are not limited in any way in this respect. Rather, embodiments of the present application may be applied to any scenario where applicable.
Having described the technical solutions of the embodiments of the present invention, various non-limiting embodiments of the present application are described in detail below.
Referring first to fig. 2, fig. 2 is a schematic diagram of a first embodiment of a method for diagnosing a faulty line in a multi-phase circuit according to the first embodiment of the present invention, where the first embodiment of the present invention may include the following:
s201: and acquiring current data and/or voltage data of each phase of power transmission line in the multi-phase circuit.
The current data and the voltage data can be collected through corresponding measuring instruments, such as an ammeter and a voltmeter; oscilloscopes may also be used; of course, any instrumentation capable of collecting current data or voltage data is possible, and the present invention is not limited thereto.
The data collected by the collecting device can be manually input, or can be input through an external storage device (such as a flash disk, an optical disk and the like), or can be input through third-party software, or can be automatically input through recognition (such as voice), or can be transmitted in a short distance (near field communication (NFC), Radio Frequency Identification (RFID), Bluetooth and the like), and of course, other modes can be adopted to transmit the data to the system, so that the implementation of the technical scheme of the application is not influenced.
The multi-phase circuit may be any phase circuit such as two-phase, three-phase, four-phase, etc.
Only the current data or the voltage data of each phase of power transmission line in the multi-phase circuit can be acquired; or both may be obtained; of course, other data, such as power, may be acquired.
S202: and calculating the corresponding voltage unbalance degree and/or current unbalance degree of each phase of power transmission line according to the current data and/or the voltage data.
The unbalance degree reflects the unbalance degree of the current corresponding power transmission line in the whole power distribution system. The voltage unbalance degree reflects the unbalance degree from the voltage perspective; and the current imbalance reflects the imbalance degree of the line from the current perspective.
When the voltage data of each phase of power transmission line in the multi-phase circuit is obtained, calculating the corresponding voltage unbalance degree of each phase of power transmission line according to each voltage data comprises the following steps:
calculating the average voltage of the multi-phase circuit:
calculating the voltage balance degree corresponding to each phase of power transmission line according to the average voltage and the voltage data of each phase of power transmission line:
wherein Δ U is an average voltage of the multi-phase circuit; delta epsilonUiThe voltage balance degree of each phase of power transmission line is obtained; u shapeiAnd the voltage value of each phase of power transmission line.
When the current data of each phase of power transmission line in the multi-phase circuit is obtained, calculating the corresponding current unbalance degree of each phase of power transmission line according to each current data comprises the following steps:
calculating the average current of the multi-phase circuit:
calculating the current balance degree corresponding to each phase of power transmission line according to the average current and the current data of each phase of power transmission line:
wherein Δ I is an average current of the multi-phase circuit; delta epsilonIiThe current balance degree of each phase of power transmission line is obtained; i isiThe current value of each phase of power transmission line.
When acquiring voltage data and current data of each phase of power transmission line in the multi-phase circuit, calculating the corresponding voltage unbalance and current unbalance of each phase of power transmission line according to each current data and each voltage data comprises:
calculating the average voltage of the multi-phase circuit:
calculating the voltage balance degree corresponding to each phase of power transmission line according to the average voltage and the voltage data of each phase of power transmission line:
calculating the average current of the multi-phase circuit:
calculating the current balance degree corresponding to each phase of power transmission line according to the average current and the current data of each phase of power transmission line:
wherein Δ U is an average voltage of the multi-phase circuit; delta epsilonUiThe voltage balance degree of each phase of power transmission line is obtained; u shapeiThe voltage value of each phase of power transmission line is obtained; Δ I is the average current of the multi-phase circuit; delta epsilonIiThe current balance degree of each phase of power transmission line is obtained; i isiThe current value of each phase of power transmission line.
S203: comparing each of the voltage unbalance and/or the current unbalance with a preset threshold.
The preset threshold value can be obtained according to a large amount of experimental data. Specifically, when a line fails, values of voltage unbalance and current unbalance corresponding to the line are recorded, and key parameters (such as power supply power, temperature and line connection mode) of the failed circuit, the voltage unbalance value and the current unbalance value are used as a group of records; and then changing experimental conditions, such as connection modes of lines, such as different generators and different generated power, testing for multiple times, establishing a mapping relation between parameters and the imbalance values corresponding to the faulty lines under each condition, and finally determining the threshold values under different conditions through multiple groups of mapping relations. Of course, the determination can be made based on experience of those skilled in the art, which does not affect the implementation of the present application.
Preferably, the preset threshold may be 5%. Of course, the skilled person can set the settings according to the specific situation, as the case may be.
S204: and when the voltage unbalance and/or the current unbalance exceed the preset threshold, judging that the corresponding line has a fault.
The preset threshold value is calculated according to the unbalance degree of the corresponding parameters when the line fails in multiple tests, so that when the unbalance degree of the current parameters exceeds the threshold value, the line can be judged to possibly fail, the circuit which is possibly failed can be monitored or maintained in advance if necessary, the line can be prevented from being failed to a certain extent, and the normal operation of each phase of power transmission line is ensured.
Therefore, the unbalanced degree of each phase of power transmission line is used as a factor for measuring the line which is possibly faulted in the operation process of the multi-phase circuit, and the faulted power transmission line can be judged simply, quickly and accurately. When the multi-phase circuit is not in fault, the circuit which is likely to be in fault is monitored or maintained in advance if necessary, so that the circuit is prevented from being in fault to a certain extent, and the normal operation of each phase of power transmission line is ensured; even if a fault occurs, the fault line can be quickly positioned, so that the fault line can be quickly repaired, the normal operation of a power distribution system is ensured to a certain extent, and the safety of the power distribution system is improved; when the multi-phase circuit breaks down, the method can be used for quickly positioning the range of the fault line, so that the time for searching the fault line is greatly shortened, the efficiency for maintaining the fault line is improved, and the safety of the whole power distribution system is improved.
In some specific implementations of the technical solution of the present application, referring to fig. 3, after step S202 (calculating the voltage imbalance and/or the current imbalance corresponding to each phase of the power transmission line according to each of the current data and/or the voltage data) in the first embodiment, for example, the second embodiment may include:
and displaying the calculated voltage unbalance and/or current unbalance of each phase of power transmission line.
The voltage imbalance and the current imbalance of the transmission lines of each phase can be displayed on a screen in the form of information in a certain format (for example, a liquid crystal screen). The information in a certain format can be text information, such as display failure; can also be in the form of pictures; the numerical expression can also be in a digital form, and the meaning of the specific numerical expression can be preset; or, the calculation result may be represented by information in any other format, which does not affect the implementation of the embodiment. Preferably, referring to fig. 4, specific values of the voltage unbalance and the current unbalance of each phase of the power transmission line in the multi-phase circuit can be displayed.
By displaying the voltage unbalance and/or the current unbalance of each phase of power transmission line, the parameter indexes of each phase of circuit in the current multi-phase circuit can be displayed to current users or working personnel more definitely, so that the running state of each phase of power transmission line is clarified. When the system judges that the fault occurs, according to the displayed content, a user or a worker can also judge the fault line, so that the safety risk brought by the fault line is avoided, the normal operation of each phase of power transmission line and the safety of the whole power distribution system are further ensured, and the efficiency of maintaining the fault line is improved.
Optionally, referring to fig. 5, in a third embodiment, based on the step S204 (when the voltage imbalance and/or the current imbalance exceed the preset threshold, it is determined that the corresponding line fails) in the first embodiment, the method further includes:
and prompting the fault line according to the judgment result.
And after fault diagnosis is carried out on the multiphase circuit, a judgment result is obtained, and a line with a fault can be further prompted according to the result, namely the judgment result is prompted.
The prompting judgment result can be displayed on a screen in a form of information in a certain format (for example, a liquid crystal display). The certain format information can be text information, such as that a display fails; can also be in the form of pictures; the numerical expression can also be in a digital form, and the meaning of the specific numerical expression can be preset; or, the determination result may be represented by information in any other format, which does not affect the implementation of the embodiment.
The prompt judgment result can also be output in a voice form, and specifically, the prompt can be made through voice, for example, the voice output is "all is normal" or "a certain line may be failed".
The prompting judgment result can also be provided with a fault indicator lamp for prompting, an LED can be used as the fault indicator lamp, of course, any other lamp form can be adopted, such as a diode, and preferably, a lamp with high brightness and low power is selected. For example, if a failure occurs, the result of the determination may be a failure by lighting a failure indicator lamp.
Of course, the prompt determination result is not limited to the three forms, and the determination result may be prompted to the user so that the user can understand the determination result.
Of course, the display, voice prompt and fault lamp setting can be performed simultaneously, which does not affect the realization of the invention.
The technical scheme of the application has higher practicability by prompting the judgment result, is convenient for a user to determine the working state of each current phase circuit, and can enable the user to immediately acquire specific fault information when the system judges that the fault occurs, so that the user is prevented from delaying the time for finding the fault line due to special reasons and causing unnecessary loss for the user.
In other embodiments of the present application, referring to fig. 6, a fourth embodiment may further include, after the first embodiment S204 (when the voltage imbalance and/or the current imbalance exceeds the preset threshold, it is determined that a corresponding line fails), for example:
and alarming the line with the fault.
The alarm device can send an alarm instruction to the alarm device, and the alarm device gives an alarm according to the alarm instruction. The alarm can be given by long-time ringing of the buzzer, of course, the alarm can be given in other ringing modes, and any other alarm mode can be adopted, which does not influence the implementation of the embodiment of the invention. Preferably, the sound of the alarm device should have strong penetrating power, large volume and obvious alarm information, so that related personnel can acquire the alarm information in time.
The setting is made in order to enable a client or a worker to know the working state of each phase of power transmission line in the current power distribution system more intuitively, and other reminding devices (such as a fault indicator lamp) can be replaced, but the setting can not be made. The technical scheme of the application is more visual and visual by setting the alarm, is convenient for workers to use, and improves the use experience of users.
The embodiment of the invention also provides a corresponding implementation device for the method for diagnosing the fault line in the multi-phase circuit, so that the method has higher practicability. The following describes an apparatus for diagnosing a faulty wire in a multi-phase circuit according to an embodiment of the present invention, and the apparatus for diagnosing a faulty wire in a multi-phase circuit described below and the method for diagnosing a faulty wire in a multi-phase circuit described above can be referred to correspondingly.
Referring to fig. 7, fig. 7 is a block diagram of an apparatus for diagnosing a fault line in a multi-phase circuit according to an embodiment of the present invention, where the apparatus may include:
the data obtaining module 701 is configured to obtain current data and/or voltage data of each phase of power transmission line in the multi-phase circuit.
A calculating module 702, configured to calculate a voltage imbalance and/or a current imbalance corresponding to each phase of the power transmission line according to each current data and/or the voltage data.
A fault diagnosis module 703, configured to compare each of the voltage imbalance degrees and/or the current imbalance degrees with a preset threshold; and when the voltage unbalance and/or the current unbalance exceed the threshold value, judging that the corresponding line has a fault.
Optionally, in some embodiments of this embodiment, referring to fig. 8, the apparatus may further include:
and the display module 704 is configured to display the calculated voltage imbalance and/or current imbalance of each phase of the power transmission line.
Optionally, in other embodiments of this embodiment, referring to fig. 8, the apparatus may further include:
and an alarm module 705, configured to send an alarm instruction.
Optionally, in other embodiments of this embodiment, referring to fig. 8, the apparatus may further include:
and a prompt result module 706, configured to send an instruction for prompting the faulty line according to the determination result.
The functions of each functional module of the device for diagnosing a faulty line in a multi-phase circuit according to the embodiments of the present invention may be specifically implemented according to the method in the embodiments of the present invention, and the specific implementation process may refer to the description related to the embodiments of the method described above, and will not be described herein again.
Therefore, the unbalanced degree of each phase of power transmission line is used as a factor for measuring the line which is possibly faulted in the operation process of the multi-phase circuit, and the faulted power transmission line can be judged simply, quickly and accurately. When the multi-phase circuit is not in fault, the circuit which is likely to be in fault is monitored or maintained in advance if necessary, so that the circuit is prevented from being in fault to a certain extent, and the normal operation of each phase of power transmission line is ensured; even if a fault occurs, the fault line can be quickly positioned, so that the fault line can be quickly repaired, the normal operation of a power distribution system is ensured to a certain extent, and the safety of the power distribution system is improved; when the multi-phase circuit breaks down, the method can be used for quickly positioning the range of the fault line, so that the time for searching the fault line is greatly shortened, the efficiency for maintaining the fault line is improved, and the safety of the whole power distribution system is improved.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The present invention provides a method and apparatus for diagnosing a faulty line in a multi-phase circuit. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A method of diagnosing a faulty wire in a multi-phase circuit, comprising:
acquiring current data and/or voltage data of each phase of power transmission line in a multi-phase circuit;
calculating the corresponding voltage unbalance and/or current unbalance of each phase of power transmission line according to the current data and/or the voltage data;
comparing each of the voltage unbalances and/or the current unbalances with a preset threshold; the preset threshold is obtained by calculating the unbalance degree of the corresponding parameters when the line fails in multiple tests;
when the voltage unbalance and/or the current unbalance exceed the preset threshold, judging that a corresponding line has a fault or has a fault risk;
when voltage data of each phase of power transmission line in the multi-phase circuit is obtained, the calculating of the corresponding voltage unbalance and/or current unbalance of each phase of power transmission line according to each current data and/or the voltage data includes:
calculating an average voltage of the multi-phase circuit:
calculating the voltage unbalance degree corresponding to each phase of power transmission line according to the average voltage and the voltage data of each phase of power transmission line:
wherein Δ U is an average voltage of the multi-phase circuit; delta epsilonUiThe voltage balance degree of each phase of power transmission line is obtained; u shapeiAnd the voltage value of each phase of power transmission line.
2. The method of claim 1, wherein the predetermined threshold is 5%.
3. The method according to claim 1, further comprising, after the calculating the voltage imbalance and/or the current imbalance of each phase transmission line according to each of the current data and/or the voltage data:
and displaying the calculated voltage unbalance and/or current unbalance of each phase of power transmission line.
4. The method according to claim 1, wherein after determining that the corresponding line has failed when the voltage imbalance and/or the current imbalance exceeds the preset threshold, the method further comprises:
and prompting the fault line according to the judgment result.
5. The method according to any one of claims 1 to 4, wherein when acquiring current data of each phase transmission line in a multi-phase circuit, the calculating the corresponding voltage imbalance and/or current imbalance of each phase transmission line according to each current data and/or voltage data comprises:
calculating an average current of the multi-phase circuit:
calculating the current unbalance degree corresponding to each phase of power transmission line according to the average current and the current data of each phase of power transmission line:
wherein Δ I is an average current of the multi-phase circuit; delta epsilonIiThe current balance degree of each phase of power transmission line is obtained; I.C. AiThe current value of each phase of power transmission line.
6. The method according to any one of claims 1 to 4, wherein after determining that the corresponding line has failed when the voltage imbalance and/or the current imbalance exceeds the preset threshold, the method further comprises:
and alarming the line with the fault.
7. An apparatus for diagnosing a faulty line in a multi-phase circuit, comprising:
the data acquisition module is used for acquiring current data and/or voltage data of each phase of power transmission line in the multi-phase circuit;
the calculation module is used for calculating the corresponding voltage unbalance and/or current unbalance of each phase of power transmission line according to the current data and/or the voltage data;
the fault diagnosis module is used for comparing each voltage unbalance degree and/or each current unbalance degree with a preset threshold value; the preset threshold is obtained by calculating the unbalance degree of the corresponding parameters when the line fails in multiple tests; when the voltage unbalance degree and/or the current unbalance degree exceed the preset threshold value, judging that the corresponding line has a fault or has a fault risk;
when voltage data of each phase of power transmission line in the multi-phase circuit is obtained, the calculating of the corresponding voltage unbalance and/or current unbalance of each phase of power transmission line according to each current data and/or the voltage data includes:
calculating an average voltage of the multi-phase circuit:
calculating the voltage unbalance degree corresponding to each phase of power transmission line according to the average voltage and the voltage data of each phase of power transmission line:
wherein Δ U is an average voltage of the multi-phase circuit; delta epsilonUiThe voltage balance degree of each phase of power transmission line is obtained; u shapeiAnd the voltage value of each phase of power transmission line.
8. The apparatus of claim 7, further comprising:
and the display module is used for displaying the calculated voltage unbalance and/or current unbalance of each phase of power transmission line.
9. The apparatus of claim 8, further comprising:
and the prompting module is used for prompting the fault line according to the judgment result.
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| CN110531178B (en) * | 2019-09-24 | 2021-11-12 | 深圳市英威腾电动汽车驱动技术有限公司 | Three-phase unbalance detection method and system for electric vehicle driving motor coil |
| CN112946421B (en) * | 2021-02-01 | 2022-08-30 | 易事特集团股份有限公司 | Three-phase power grid fault diagnosis method and device, computer equipment and storage medium |
| CN113281608B (en) * | 2021-03-05 | 2023-09-26 | 国网江苏省电力有限公司盐城供电分公司 | Cable fault identification method based on current analysis |
| CN113970684A (en) * | 2021-10-20 | 2022-01-25 | 国网天津市电力公司 | Distribution line open-phase fault fast searching method and device |
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