CN115327282B - Power supply system fault diagnosis method - Google Patents
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- CN115327282B CN115327282B CN202211108857.6A CN202211108857A CN115327282B CN 115327282 B CN115327282 B CN 115327282B CN 202211108857 A CN202211108857 A CN 202211108857A CN 115327282 B CN115327282 B CN 115327282B
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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
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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
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
A power supply system fault diagnosis method comprises voltage data acquisition, abnormal equipment extraction and fault root acquisition, and when voltage root finding is carried out, incoming line fault judgment, equipment fault judgment and line fault judgment are carried out. According to the embodiment of the invention, the abnormal equipment is screened out through too low voltage, and then the fault query is respectively carried out on the front end, the abnormal equipment and the line according to the position, the voltage and the state information of the abnormal equipment and the voltage of the adjacent equipment, so that the fault root equipment can be quickly found, the fault point can be quickly found, the alarm storm is reduced, the manual analysis of operation and maintenance personnel is not needed, the dependence on the operation and maintenance personnel is reduced, the operation and maintenance difficulty is reduced, and the operation and maintenance personnel can conveniently carry out fault troubleshooting.
Description
Technical Field
The invention belongs to the technical field of electrical systems, and particularly relates to a power supply system fault diagnosis method.
Background
Most data centers require uninterrupted operation all the year around, and a high-reliability uninterrupted power supply system is a basic condition for the operation of the data centers. At present, data centers with high safety requirements are built according to a level a data center, a power supply system of the level a data center is built according to a fault-tolerant architecture, and the power supply system of the data center includes power supply devices (such as a transformer and a UPS), protection devices (such as a circuit breaker) and power supply lines (such as a cable and a bus).
The data center power supply system designed according to the fault-tolerant architecture can not cause service interruption when events such as equipment failure, misoperation, external mains supply power failure and the like occur; despite the protection on the system, many data center accidents often result from secondary failure events, for example, when a failure occurs, the failure is enlarged due to an operation error caused by misjudgment of the failure cause, thereby causing a downtime of a large area of equipment. Therefore, when a fault occurs, the fault equipment source can be found in time, the fault reason can be quickly determined, and the safety of power supply of the data center can be greatly improved.
A monitoring system adopted by the current data center sets monitoring points for power supply equipment, protection equipment, circuits and the like, and can give an alarm when equipment breaks down. However, the device alarm can only give a fault warning of the device, and cannot give a fault reason, such as: when the UPS alarms that the input power supply fails, the input power supply fails or the input breaker trips. Moreover, often can lead to all downstream equipment to report to the police simultaneously when upstream equipment breaks down, causes the warning storm, can't make fortune dimension personnel to judge trouble equipment and trouble reason fast, for example: when the main incoming line power supply has power failure, all equipment at the rear end can report the power failure fault of the input power supply.
Disclosure of Invention
Aiming at the defects in the related art, the invention provides a power supply system fault diagnosis method to solve the problem that the monitoring system of the current power supply system cannot judge the fault equipment.
The invention provides a power supply system fault diagnosis method, which comprises the following steps:
voltage data acquisition: monitoring input voltage V of each electrical device connected in sequence in power supply system in real time in And an output voltage V out ；
Abnormal equipment extraction: will output a voltage V out An electrical device lower than a set voltage threshold is used as an abnormal device;
acquiring a fault root: voltage root finding is carried out on the abnormal equipment to obtain fault root equipment;
the voltage root finding comprises the following steps:
and (3) incoming line fault judgment: extracting the front-end device ID stored in the abnormal device and the input voltage V of the abnormal device in If the front-end ID is null and the input voltage V is in If the voltage is smaller than the set voltage threshold, the incoming line power supply is used as fault root equipment; if the front-end ID is not null or the input voltage V in If the voltage is greater than or equal to the set voltage threshold, judging equipment failure;
and (3) equipment fault judgment: extracting fault state information of an abnormal device and an input voltage V of the abnormal device in If the fault state information is an abnormal state or an input voltage V in If the voltage is smaller than the set voltage threshold, the abnormal equipment is used as fault root equipment; if the fault status information is normal status and the input voltage V is in If the voltage is greater than or equal to the set voltage threshold, a line fault judgment step is carried out;
and (3) judging line faults: extracting output voltage V of adjacent electrical equipment at front end of abnormal equipment out If the output voltage V is out And if the voltage is smaller than the set voltage threshold, the electric line between the abnormal equipment and the front adjacent electric equipment is used as fault root equipment.
In some of these embodiments, further comprising the steps of:
current data acquisition: monitoring the electrified current I of each electrical device connected in sequence in the power supply system in real time on Input current I in And an output current I out ；
Extracting tracing equipment: obtaining abnormal equipment of fault root equipment when voltage is rooted as tracing equipment;
acquiring a fault source: the tracing device carries out current tracing to obtain fault source equipment;
the current tracing method comprises the following steps:
and (3) overcurrent judgment: extracting fault state information and electrified current I of tracing equipment within set time length before fault occurs on If the maximum value of the current I is applied on If the maximum value of the tracing device is less than or equal to the set current threshold value and the fault state information is in an abnormal state, taking the tracing device as a fault source device; if the current I is on on If the maximum value of the current is larger than the set current threshold value, the rear-end current judgment step is carried out;
judging the rear-end current: extracting output current I of tracing equipment within set time length before fault occurrence out And input current I of all electrical equipment connected with the rear end of the tracing equipment in If the output current I of the tracing device is the sum of out All the electrical devices connected with the rear end of the tracing deviceStandby input current I in If the sums are different, the electric line connected with the rear end of the tracing device is used as fault source equipment; if the output current I of the tracing equipment out Input current I of all electrical equipment connected with rear end of tracing equipment in If the sum is the same, the current variation judging step is carried out;
and (3) judging the current change amount: the method comprises the step of enabling the electrifying current I of the tracing equipment within a set time length before the fault occurs on The time of the maximum value is taken as a first time, the time corresponding to the interval set time length before the first time is taken as a second time, and the energization current I of the tracing device between the first time and the second time is extracted on Change amount Δ I of on And the input current I of the adjacent electrical equipment at the rear end of the tracing equipment between the first moment and the second moment in Change amount Δ I of in If Δ I on ≠ΔI in Taking the tracing device as a fault source device; if Δ I on ＝ΔI in And taking the rear-end adjacent electrical equipment as tracing equipment and carrying out current tracing on the tracing equipment.
In some embodiments, in the overcurrent determination step, the tracing device is used as a fault source device, and fault information with the tracing device alarm information is sent at the same time; in the rear-end current judging step, an electrical circuit connected with the rear end of the tracing device is used as fault source equipment, and fault information with short-circuit faults is sent at the same time; in the current variation judging step, the tracing device is used as a fault source device, and fault information with overload is sent at the same time.
In some of these embodiments, the time at which the abnormal device occurs is the time at which the fault occurs.
In some of these embodiments, the set duration is 10 seconds.
In some embodiments, the set current threshold is X times of a rated current of the tracing device corresponding to the current tracing, where X is greater than 1.
In some of these embodiments, X =1.25.
In some embodiments, in the back-end current determination, if all the back-ends of the tracing device are connected to each otherInput current I of electrical equipment in The sum of the output currents I of the tracing equipment is more than or equal to out Y times, the output current I of the tracing equipment is determined out Input current I of all electrical equipment connected with rear end of tracing equipment in The sum is the same; if all the electrical equipment input currents I connected with the rear end of the tracing equipment in The sum of the current values is less than the output current I of the tracing equipment out Y times, the output current I of the tracing equipment is determined at will out Input current I of all electrical equipment connected with rear end of tracing equipment in The sum is different;
wherein Y is less than 1.
In some of these embodiments, Y =0.95.
In some of these embodiments, the set voltage threshold is 10V.
Based on the technical scheme, the abnormal equipment is screened out through too low voltage, and then the front end, the abnormal equipment and the line of the abnormal equipment are respectively subjected to fault inquiry according to the position, the voltage and the state information of the abnormal equipment and the voltage of adjacent equipment, so that the fault root equipment can be quickly found, the fault point can be quickly found, the alarm storm is reduced, the manual analysis of operation and maintenance personnel is not needed, the dependence on the operation and maintenance personnel is reduced, the operation and maintenance difficulty is reduced, the operation and maintenance personnel can conveniently perform fault troubleshooting, and the problem that the fault equipment cannot be judged by a monitoring system of the current power supply system is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is an operation flowchart of the power supply system fault diagnosis method of the present invention.
Detailed Description
The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting.
The terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, in an exemplary embodiment of the power supply system fault diagnosis method of the present invention, the power supply system fault diagnosis method includes voltage data acquisition, abnormal device extraction, and fault root acquisition.
The power supply system is provided with a plurality of electrical devices which are connected in sequence, the electrical device at the front end is connected with the incoming line power supply, the electrical device at the rear end is connected with the electrical device, the incoming line power supply supplies power for the electrical device through the electrical device of the power supply system, the electrical device comprises a power supply device and a protection device, the electrical device has the function of monitoring the working state of the electrical device and can store data, the power supply device comprises a transformer and a UPS, and the protection device comprises a circuit breaker. Each electrical equipment stores a front-end equipment ID, the front-end equipment ID is the ID of the other electrical equipment adjacent to the front end, if the front end is not connected with other electrical equipment, the front-end equipment ID is a null value, and the upper computer is connected with each electrical equipment, so that the working state of the electrical equipment can be acquired.
Voltage data acquisition, real-time monitoring of input voltage V of each electrical equipment by upper computer through electric meter in And an output voltage V out . When the output voltage V of any electrical equipment out When the voltage is lower than the set voltage threshold value, a fault occurs, abnormal equipment is extracted, and the upper computer outputs the voltage V out The electrical device below the set voltage threshold is regarded as an abnormal device. And acquiring a fault root, and carrying out voltage root finding on the abnormal equipment by the upper computer to acquire fault root equipment, wherein the fault root equipment is equipment at a fault position.
When the voltage is rooted, the incoming line fault is judged, and the front-end equipment ID stored in the abnormal equipment and the input voltage V of the abnormal equipment are extracted in If the front-end ID is null and the input voltage V is in If the voltage is smaller than the set voltage threshold, the incoming line power supply is used as fault root equipment; if the front-end ID is not null or the input voltage V in If the voltage is greater than or equal to the set voltage threshold, judging equipment failure; performing equipment fault judgment, extracting the state information of the abnormal equipment and the input voltage V of the abnormal equipment in If the state information is abnormal state or input voltage V in If the voltage is smaller than the set voltage threshold, the abnormal equipment is used as fault root equipment; if the state information is normal state and the input voltage V is in If the voltage is greater than or equal to the set voltage threshold, a line fault judgment step is carried out; judging line fault, and extracting output voltage V of adjacent electrical equipment at front end of abnormal equipment out If the output voltage V is out And if the voltage is smaller than the set voltage threshold, the electric line between the abnormal equipment and the front adjacent electric equipment is used as fault root equipment.
In the equipment fault judging step, when the abnormal equipment is protection equipment, the abnormal state is that the protection equipment is in an open state, and the normal state is that the protection equipment is in a closed state; when the abnormal device is a power supply device, the abnormal state is that the power supply device is in a fault state, and the normal state is that the power supply device is in a normal state. When the incoming line fault is judged, if the output voltage is smaller than the threshold value and no other electrical equipment exists at the front end, the fault root of the current abnormal equipment can be determined to be located in the incoming line power supply; when equipment failure is judged, if the input voltage is higher than the threshold value and the state information is in an abnormal state, the current abnormal equipment front-end line can be determined to be good and power can be supplied, and the failure root is located in the equipment failure judgment; when the line fault is judged, the front-end equipment has voltage output but the input voltage of the front-end equipment is smaller than the threshold value, and then the fault root can be determined to be positioned on the line between the two equipment. And (4) fault troubleshooting is respectively carried out on the front end, the equipment and the line of the abnormal equipment by incoming line fault judgment, equipment fault judgment and line fault judgment, and the fault position is found.
In the above exemplary embodiment, the occurrence of a fault is found by outputting a voltage lower than a threshold, the abnormal device is marked, and then the fault query of voltage root finding is performed on the front end, the abnormal device itself and the line of the abnormal device according to the position, the voltage and the state information of the abnormal device and the voltage of the adjacent device, so that the fault root device can be quickly found, the fault point can be quickly found, the alarm storm is reduced, the manual analysis of operation and maintenance personnel is not needed, the dependence on the operation and maintenance personnel is reduced, the operation and maintenance difficulty is reduced, and the operation and maintenance personnel can conveniently perform fault troubleshooting; and when each abnormal device carries out voltage root finding, the fault root device can be output, so that all fault points found by the power supply system can be found out, the difficulty of troubleshooting of operation and maintenance personnel is further reduced, and the problem that the fault device cannot be judged by a monitoring system of the current power supply system is solved.
In some embodiments, in order to accurately find the fault cause, the power supply system fault diagnosis method further comprises current data acquisition, source tracing equipment extraction and fault source acquisition.
The current data is collected, and the upper computer monitors each electricity in real time through the electric meterInput current I of gas plant in And an output current I out Because the working state of the electrical equipment has the electrifying current data, the upper computer directly obtains the electrifying current I of each electrical equipment on . And extracting tracing equipment, and taking abnormal equipment obtained by voltage root finding as the tracing equipment. And obtaining a fault source, wherein the upper computer conducts current tracing on the tracing equipment to obtain the fault source equipment, and the fault source equipment is directly related to the fault source.
When the current is traced, overcurrent judgment is carried out, and state information and electrified current I of tracing equipment within a set time length before a fault occurs are extracted on If the maximum value of the current I is applied on If the maximum value of the tracing device is less than or equal to the set current threshold value and the state information is in an abnormal state, the tracing device is used as a fault source device; if the current I is energized on If the maximum value of the current is larger than the set current threshold value, performing a rear-end current judgment step; judging the rear-end current, and extracting the output current I of the tracing equipment within a set time before the fault occurs out And input current I of all electrical equipment connected with the rear end of the tracing equipment in If the output current I of the tracing device is the sum of out Input current I of all electrical equipment connected with rear end of tracing equipment in If the sums are different, the electric line connected with the rear end of the tracing device is used as fault source equipment; if the output current I of the tracing equipment out Input current I of all electrical equipment connected with rear end of tracing equipment in If the sum is the same, the step of judging the current variation is carried out; judging the current variation, and judging the electrified current I of the tracing equipment within the set time length before the fault occurs on The time of the maximum value is taken as a first time, the time corresponding to the interval set time length before the first time is taken as a second time, and the energization current I of the tracing device between the first time and the second time is extracted on Change amount Δ I of on And the input current I of the adjacent electrical equipment at the rear end of the tracing equipment between the first moment and the second moment in Change amount Δ I of in If Δ I on ≠ΔI in Taking the tracing device as a fault source device; if Δ I on ＝ΔI in And taking the rear-end adjacent electrical equipment as tracing equipment and carrying out current tracing on the tracing equipment.
Judging whether the maximum current exceeds a threshold value before passing through the fault by overcurrent, if not, not generating the overcurrent condition, and sending alarm information by the equipment, so that the fault source can be determined as the equipment, and if the maximum current exceeds the threshold value, generating the overcurrent condition, and analyzing the current conditions and current relations of other equipment; the rear-end current judges whether the fault source is a circuit at the rear end of the equipment or not through the relationship between the current of the rear-end current and the sum of the rear-end current; the current change amount is judged through the change amount of the one-end time current before the maximum current before the fault, so that whether the fault source is the rear end of the equipment can be determined. The overcurrent judgment, the end current judgment and the current change judgment can respectively find whether the fault source is located in the back-end circuit or the back-end equipment, and compared with the method for finding the fault root equipment, the method can reduce the range and find the fault position more accurately.
The current tracing is carried out on the abnormal equipment for finding out the fault root equipment, and the current tracing judges the fault reason according to the current condition before the fault, so that the range is further narrowed under the condition of finding out the fault root equipment, operation and maintenance personnel are assisted to carry out fault finding quickly, and the position of the fault is found out more accurately.
In some embodiments, in order to further clarify the cause of the fault, in the overcurrent determination step, the tracing device is used as a fault source device, and fault information with alarm information in an abnormal state is sent at the same time; in the rear-end current judging step, an electrical line connected with the rear end of the tracing equipment is used as fault source equipment, and fault information with short-circuit faults is sent at the same time; in the current variation judging step, the tracing device is used as a fault source device, and fault information with overload is sent at the same time.
The electrical equipment has an alarm function and can send alarm information, the state information of the electrical equipment has abnormal state information, the abnormal state information has alarm information, and the overcurrent judgment step can not only find whether a fault source is the fault source, but also directly acquire the alarm information sent by the fault source according to the fault information; the rear-end current judging step can not only find whether the fault source is a rear-end circuit, but also directly know that the fault reason is a short-circuit fault according to the fault information; the current variation judging step can find whether the fault source is the back-end equipment or not, and directly learn that the fault reason is the overload fault according to the fault information.
When the fault source equipment is determined, fault information is sent out, so that operation and maintenance personnel can determine the fault reason clearly, and the fault troubleshooting is quicker and more accurate.
In some embodiments, the time when the fault occurs is the time when the abnormal device occurs, when the output voltage V of any electrical device is out When the voltage is lower than the set voltage threshold, the time is determined as the fault occurrence time, and the electric equipment lower than the set voltage threshold is simultaneously defined as abnormal equipment.
In some embodiments, the set time duration is 10 seconds, so that a sufficient time range is provided before a fault occurs, the maximum current capable of causing impact damage to the electrical equipment and the magnitude relation between the sum of the current of the tracing equipment and the current of the back-end equipment when the system is normal can be accurately found, and the accuracy of fault source searching and fault reason confirmation is ensured.
In some embodiments, the current threshold is set to be X times of a rated current of the tracing device corresponding to the current tracing, and X is greater than 1. The device rated current is used as a base number to serve as a set current threshold, whether the device has an overcurrent condition or not can be determined, and alarm information sent by the device is further referred to, so that whether a fault source is in the device or not is determined.
In order to moderate the degree to which the set current threshold is higher than the rated current, X is 1.25.
In some embodiments, when the back-end current is determined, if all the electrical devices connected to the back end of the tracing device input the current I in The sum of the output currents I of the tracing equipment is more than or equal to out Y times, the output current I of the tracing equipment is determined out Input current I of all electrical equipment connected with rear end of tracing equipment in The sum is the same; if it isInput current I of all electrical equipment connected with rear end of tracing equipment in The sum of the current values is less than the output current I of the tracing equipment out Y times, the output current I of the tracing equipment is determined out All electrical equipment input currents I connected with the rear end of the tracing equipment in The sum is different; wherein Y is less than 1.
Because the current fluctuates in a certain range in the operation process of the power supply system, the sum of the output current of the tracing equipment and the input current of the rear-end equipment is not necessarily completely coincident, and the magnitude relation between the output current of the tracing equipment and the input current of the rear-end equipment is compared to determine whether the current relation is the same or not after the multiple smaller than 1 is adopted, so that the fault analysis can be smoothly carried out downwards, and the fault source of the rear-end line can be accurately determined.
In some embodiments, Y is 0.95, and the sum of the input currents multiplied by the coefficient Y is not reduced too much, so that the fault source judgment is accurate.
In some embodiments, the voltage threshold is set to 10V, so that the occurrence of the fault can be found earlier and more accurately.
Finally, it should be noted that: in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (10)
1. A power supply system fault diagnosis method is characterized by comprising the following steps:
voltage data acquisition: monitoring input voltage V of each electrical device connected in sequence in power supply system in real time in And an output voltage V out ；
Abnormal equipment extraction: will output a voltage V out An electrical device lower than a set voltage threshold is used as an abnormal device;
acquiring a fault root: the abnormal equipment carries out voltage root searching to obtain fault root equipment;
the voltage root finding comprises the following steps:
and (3) judging incoming line faults: extracting the front-end device ID stored in the abnormal device and the input voltage V of the abnormal device in If the front-end ID is null and the input voltage V is in If the voltage is smaller than the set voltage threshold, the incoming line power supply is used as fault root equipment; if the front-end ID is not null or the input voltage V in If the voltage is greater than or equal to the set voltage threshold, judging equipment failure;
and (3) equipment fault judgment: extracting status information of an abnormal device and an input voltage V of the abnormal device in If the state information is abnormal state or input voltage V in If the voltage is smaller than the set voltage threshold, the abnormal equipment is used as fault root equipment; if the state information is normal state and the input voltage V is in If the voltage is greater than or equal to the set voltage threshold, a line fault judgment step is carried out;
and (3) judging line faults: extracting output voltage V of adjacent electrical equipment at front end of abnormal equipment out If the output voltage V is out And if the voltage is smaller than the set voltage threshold, the electric line between the abnormal equipment and the front adjacent electric equipment is used as fault root equipment.
2. The power supply system fault diagnosis method according to claim 1, characterized by further comprising the steps of:
current data acquisition: monitoring the electrified current I of each electrical device connected in sequence in the power supply system in real time on Input current I in And an output current I out ；
Extracting tracing equipment: obtaining abnormal equipment of fault root equipment when voltage is rooted as tracing equipment;
acquiring a fault source: the tracing device carries out current tracing to obtain fault source equipment;
the current tracing method comprises the following steps:
and (3) overcurrent judgment: extracting state information and electrified current I of tracing equipment in set time length before fault occurs on If the maximum value of the current I is applied on If the maximum value of the tracing device is less than or equal to the set current threshold value and the state information is in an abnormal state, the tracing device is used as a fault source device; if the current I is on on If the maximum value of the current is larger than the set current threshold value, performing a rear-end current judgment step;
judging the rear-end current: extracting output current I of tracing equipment within set time length before fault occurs out And input current I of all electrical equipment connected with the rear end of the tracing equipment in If the output current I of the tracing device is the sum of out Input current I of all electrical equipment connected with rear end of tracing equipment in If the sums are different, the electric line connected with the rear end of the tracing device is used as fault source equipment; if the output current I of the tracing equipment out Input current I of all electrical equipment connected with rear end of tracing equipment in If the sum is the same, the step of judging the current variation is carried out;
and (3) judging the current change amount: the method comprises the step of enabling the electrifying current I of the tracing equipment within a set time length before the fault occurs on The time of the maximum value is taken as a first time, the time corresponding to the interval set time length before the first time is taken as a second time, and the energization current I of the tracing device between the first time and the second time is extracted on Change amount Δ I of on And the input current I of the adjacent electrical equipment at the rear end of the tracing equipment between the first moment and the second moment in Change amount Δ I of in If Δ I on ≠ΔI in Taking the tracing device as a fault source device; if Δ I on ＝ΔI in And taking the rear-end adjacent electrical equipment as tracing equipment and carrying out current tracing on the tracing equipment.
3. The power supply system fault diagnosis method according to claim 2, characterized in that in the overcurrent judgment step, the tracing device is used as a fault source device, and fault information with alarm information in an abnormal state is sent at the same time; in the rear-end current judging step, an electrical circuit connected with the rear end of the tracing device is used as fault source equipment, and fault information with short-circuit faults is sent at the same time; in the current variation judging step, the tracing device is used as a fault source device, and fault information with overload is sent at the same time.
4. The power supply system fault diagnosis method according to claim 2, characterized in that the timing at which the abnormal device occurs is the timing at which the fault occurs.
5. The power supply system fault diagnosis method according to claim 2, characterized in that the set time period is 10 seconds.
6. The power supply system fault diagnosis method according to claim 2, wherein the set current threshold is X times of a rated current of a tracing device corresponding to the current tracing, and X is greater than 1.
7. The power supply system fault diagnosis method according to claim 6, characterized in that X =1.25.
8. The power supply system fault diagnosis method according to claim 2, characterized in that in the back-end current judgment, if all the electrical equipment input currents I connected to the back end of the tracing equipment are I in The sum of the output currents I of the tracing equipment is more than or equal to out Y times, the output current I of the tracing equipment is determined out Input current I of all electrical equipment connected with rear end of tracing equipment in The sum is the same; if all the electrical equipment input currents I connected with the rear end of the tracing equipment in The sum of the current values is less than the output current I of the tracing equipment out Y times, the output current I of the tracing equipment is determined out All electrical equipment input currents I connected with the rear end of the tracing equipment in The sum is different; wherein Y is less than 1.
9. The power supply system fault diagnosis method according to claim 8, characterized in that Y =0.95.
10. The power supply system fault diagnosis method according to claim 1, characterized in that the set voltage threshold is 10V.
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| CN202211108857.6A CN115327282B (en) | 2022-09-13 | 2022-09-13 | Power supply system fault diagnosis method |
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| CN202211108857.6A CN115327282B (en) | 2022-09-13 | 2022-09-13 | Power supply system fault diagnosis method |
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| CN115327282A CN115327282A (en) | 2022-11-11 |
| CN115327282B true CN115327282B (en) | 2023-03-10 |
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