CN117741344A - Short-circuit fault judging method, system, equipment and storage medium for abrupt current - Google Patents
Short-circuit fault judging method, system, equipment and storage medium for abrupt current Download PDFInfo
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Abstract
The invention belongs to the technical field of power distribution network line fault detection, and discloses a short circuit fault judging method, a short circuit fault judging system, short circuit fault judging equipment and a storage medium for abrupt current, wherein the method comprises the following steps: acquiring a current value or an electric field value of a normal state of a line to be detected, duration time of the normal state, a current value of a fault state, duration time of the fault state, a current value of a power-down state and a falling detection time of the power-down state; comparing the current value or the electric field value and the duration of the normal state with a preset current threshold or electric field threshold and duration threshold; comparing the current value and duration of the fault state with a preset current threshold value and duration threshold interval; comparing the current value and the falling detection time of the power-down state with a preset current threshold value and the falling detection time; and judging whether the abrupt current in the circuit has short circuit fault or not according to the comparison result. The invention can accurately judge whether the abrupt current on the outgoing line has short circuit fault or not.
Description
Technical Field
The invention belongs to the technical field of power distribution network line fault detection, and particularly relates to a short circuit fault judging method, a short circuit fault judging system, short circuit fault judging equipment and a storage medium for abrupt current.
Background
The short-circuit fault on the distribution network line is a common fault, and the judging method for the short-circuit fault on the distribution network line generally comprises the following steps: if a short circuit fault occurs in a normal working line, the current value of fault current is between 200A and 300A, the duration time is between 40ms and 3s, the current value of residual current of the line after the short circuit fault occurs is smaller than 3A, and the current falling time is larger than 3s, so that the short circuit fault occurs in the power distribution network line.
However, if the cable of the power distribution network line is cut off, a huge abrupt current is generated on the line, usually between 3500A and 4000A, and the range of the fault indicator is only 800A, the current value of the abrupt current in the line cannot be tested, and in addition, a long judging time is required for the line to fall to the line without electricity when the line is short-circuited, and the traditional short-circuit fault judging method of the abrupt current cannot judge whether the abrupt current in the line is short-circuited.
Therefore, how to accurately judge whether a short circuit fault occurs on the line under the condition that a huge abrupt change current occurs on the line is a problem to be solved.
Disclosure of Invention
In view of the above technical problems, the present invention provides a method, a system, a device and a storage medium for determining a short circuit fault of a sudden change current, which are used for solving the technical problems.
In a first aspect, the present invention provides a method for judging a short circuit fault of a sudden change current, including:
acquiring a current value or an electric field value of a normal state of a line to be detected, duration time of the normal state, a current value of a fault state, duration time of the fault state, a current value of a power-down state and a falling detection time of the power-down state;
comparing the current value of the normal state with a preset current threshold of the normal state or comparing the electric field value of the normal state with a preset electric field threshold of the normal state, and comparing the duration of the normal state with a preset duration threshold of the normal state to obtain a first comparison result;
comparing the current value of the fault state with a preset current threshold value of the fault state, and comparing the duration time of the fault state with a preset duration time threshold interval of the fault state to obtain a second comparison result;
comparing the current value of the power-down state with a preset current threshold of the power-down state, and comparing the falling detection time of the power-down state with the falling detection time of the preset power-down state to obtain a third comparison result;
and judging whether the abrupt current in the circuit has short circuit fault or not according to the first comparison result, the second comparison result and the third comparison result.
Preferably, determining whether the abrupt current in the line has a short-circuit fault according to the first comparison result, the second comparison result, and the third comparison result includes:
when meeting: the current value of the normal state is larger than the preset current threshold of the normal state or the electric field value of the normal state is larger than the preset electric field threshold of the normal state, and the duration of the normal state is larger than the duration threshold of the preset normal state;
the current value of the fault state is larger than the preset current threshold value of the fault state, and the duration time of the fault state belongs to the preset duration time threshold interval of the fault state;
when the current value of the power-down state is smaller than the current threshold value of the preset power-down state and the falling detection time of the power-down state is longer than the falling detection time threshold value of the preset power-down state, short circuit fault occurs to the abrupt current in the circuit;
otherwise, no short-circuit fault occurs in the abrupt current in the line.
Preferably, the preset current threshold in the normal state is 5A, the electric field threshold in the preset normal state is 500V, and the duration threshold in the preset normal state is 5s.
Preferably, the preset current threshold of the fault state is 800A, and the duration threshold interval of the preset fault state is 40ms-3 s.
Preferably, the current threshold of the preset power-down state is 3A, and the drop detection time threshold of the preset power-down state is 120s.
Preferably, the current threshold of the preset power-down state is 5A, and the drop detection time threshold of the preset power-down state is 60s.
Preferably, the method further comprises:
if the sudden change current in the line is judged to have short circuit fault, determining the short circuit fault position of the sudden change current in the line according to a fault indicator;
judging the risk level of the short circuit fault according to the short circuit fault position of the abrupt current in the line, and taking response measures according to the risk level of the short circuit fault.
In a second aspect, the present invention further provides a short-circuit fault determining system for abrupt current, including:
the acquisition module is used for acquiring a current value or an electric field value of a normal state of a line to be detected, duration time of the normal state, a current value of a fault state, duration time of the fault state, a current value of a power-down state and a falling detection time of the power-down state;
the first comparison module is used for comparing the current value of the normal state with a preset current threshold value of the normal state or comparing the electric field value of the normal state with a preset electric field threshold value of the normal state, and comparing the duration time of the normal state with a preset duration time threshold value of the normal state to obtain a first comparison result;
the second comparison module is used for comparing the current value of the fault state with a preset current threshold value of the fault state, and comparing the duration time of the fault state with a preset duration time threshold interval of the fault state to obtain a second comparison result;
the third comparison module is used for comparing the current value of the power-down state with a preset current threshold value of the power-down state, and comparing the falling detection time of the power-down state with the falling detection time of the preset power-down state to obtain a third comparison result;
and the judging module is used for judging whether the abrupt current in the circuit has short circuit fault or not according to the first comparison result, the second comparison result and the third comparison result.
In a third aspect, the present invention also provides an electronic device comprising a processor, and a memory coupled to the processor, the memory storing program instructions executable by the processor;
the processor, when executing the program instructions stored in the memory, implements the method for determining a short-circuit fault of a sudden current according to any one of the first aspect.
In a fourth aspect, the present invention also provides a storage medium having stored therein program instructions which, when executed by a processor, implement a short circuit fault determination method capable of implementing the abrupt current according to any of the first aspects described above.
Compared with the prior art, the short-circuit fault judging method, system, equipment and storage medium for abrupt current provided by the invention have the advantages that the current value of the fault state is compared with the preset current threshold value of the fault state, and the duration time of the fault state is compared with the preset duration time threshold interval of the fault state; comparing the current value of the power-down state with a preset current threshold of the power-down state, and comparing the falling detection time of the power-down state with the falling detection time of the preset power-down state. According to the invention, by setting the current threshold value of the fault state to 800A and setting the current threshold value of the power-down state to 3A and setting the drop detection time threshold value of the power-down state to 120s, whether the line has a short circuit fault or not can be accurately judged under the condition that a huge abrupt current occurs on the line.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is apparent that the drawings in the following description are only some embodiments of the present invention, but not all embodiments, and other drawings obtained according to these drawings without inventive effort are all within the scope of the present invention.
Fig. 1 is a schematic flow chart of a short-circuit fault judging method for abrupt current according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of line detection performed by a fault indicator according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a short-circuit fault judging system for abrupt current according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
fig. 5 is a schematic diagram of a storage medium according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In order that the manner in which the above recited invention is attained and can be understood in detail, a more particular description of the invention, briefly summarized below, may be had by reference to embodiments thereof which are illustrated in the appended drawings; this is not the only form of practicing or implementing the invention as embodied. The description covers the features of the embodiments and the method steps and sequences for constructing and operating the embodiments. However, other embodiments may be utilized to achieve the same or equivalent functions and sequences of steps. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein.
In the description of the embodiments of the present invention, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; the text "and/or" is merely an association relation describing the associated object, and indicates that three relations may exist, for example, a and/or B may indicate: in addition, in the description of the embodiments of the present invention, "plural" means two or more, and other words and the like, it is to be understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention, and embodiments of the present invention and features in the embodiments may be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a flow chart of a short-circuit fault determining method for abrupt current according to an embodiment of the present invention, where the short-circuit fault determining method for abrupt current may be executed by a software and/or hardware device. For example, referring to fig. 1, the method for determining a short-circuit fault of the abrupt current may include:
s101, acquiring a current value or an electric field value of a normal state of a line to be detected, duration of the normal state, a current value of a fault state, duration of the fault state, a current value of a power-down state and a drop detection time of the power-down state.
Specifically, in the embodiment of the invention, whether the sudden change current in the power distribution network line has a short circuit fault or not is judged by adopting the fault indicator, the fault indicator can read the current values of the power distribution network to-be-detected line in each state, and whether the line has a fault or not is judged according to the current values and the duration time obtained in each state.
It should be further noted that, the detection point of the line to be detected may be preset in the power distribution network line, that is, the current value of the current signal of a certain position preset in the power distribution network line is collected, the position of the fault indicator may be directly used as the detection point of the line to be detected, or may be specifically determined according to the actual situation, which is not specifically limited in the embodiment of the present invention.
S102, comparing the current value of the normal state with a preset current threshold of the normal state or comparing the electric field value of the normal state with a preset electric field threshold of the normal state, and comparing the duration of the normal state with a preset duration threshold of the normal state to obtain a first comparison result. In the embodiment of the invention, whether the sudden change current in the power distribution network line has short circuit fault is judged, and the primary condition is that the power exists in the power distribution network line to be detected and the power distribution network line is in a normal state.
S103, comparing the current value of the fault state with a preset current threshold value of the fault state, and comparing the duration time of the fault state with a preset duration time threshold interval of the fault state to obtain a second comparison result. In the embodiment of the invention, when the power is detected in the to-be-detected line of the power distribution network, after the line is in a normal state, whether the to-be-detected line of the power distribution network has fault current or not and the duration of the fault current in the line are detected.
S104, comparing the current value of the power-down state with a preset current threshold value of the power-down state, and comparing the falling detection time of the power-down state with the falling detection time of the preset power-down state to obtain a third comparison result. In the embodiment of the invention, the power failure state is a state after the current fails, and after the fault current in the line to be detected of the power distribution network is detected, the current value of the residual current after the fault of the line to be detected of the power distribution network is detected, and the falling detection time when the current falls to the power failure state is detected.
S105, judging whether the sudden change current in the circuit has a short circuit fault or not according to the first comparison result, the second comparison result and the third comparison result.
As one embodiment, determining whether a short-circuit fault occurs in the abrupt current in the line according to the first comparison result, the second comparison result, and the third comparison result includes: when meeting: the first condition is: the current value of the normal state is larger than the preset current threshold of the normal state or the electric field value of the normal state is larger than the preset electric field threshold of the normal state, and the duration of the normal state is larger than the duration threshold of the preset normal state; the second condition is: the current value of the fault state is larger than the preset current threshold value of the fault state, and the duration time of the fault state belongs to the preset duration time threshold interval of the fault state; third condition: when the current value of the power-down state is smaller than the current threshold value of the preset power-down state and the falling detection time of the power-down state is longer than the falling detection time threshold value of the preset power-down state, short circuit fault occurs to the abrupt current in the circuit; otherwise, no short-circuit fault occurs in the abrupt current in the line. In the embodiment of the invention, the three conditions are met, and if special conditions such as cable cutting-off and the like occur, the fault indicator can accurately judge whether the detection point of the power distribution network line has a short circuit fault or not through the circuit fault judging method of the abrupt current, so that the working efficiency of power grid staff is greatly improved.
As an embodiment, the preset current threshold in the normal state is 5A, the electric field threshold in the preset normal state is 500V, and the duration threshold in the preset normal state is 5s. Specifically, a current threshold value or an electric field threshold value in a normal state and a duration threshold value in the normal state may be preset first, in this embodiment of the present invention, the preset current threshold value in the normal state is greater than 5A, the electric field threshold value is greater than 500V, and the duration of the normal state is greater than 5s, and for example, when the fault indicator reads that the current value of the detection point on the power distribution network line for 6s is greater than 5A, or the electric field value of the detection point on the power distribution network line for 6s is greater than 500V, the line of the detection point is in a normal state. In the embodiment of the invention, the rated current in the power distribution network line is 5A, when the current in the power distribution network line is less than 5A or the electric field is less than 500V, the power distribution network line is likely to be in a power-down state, and only part of residual current exists in the power distribution network line, so that the preset current threshold value in the normal state is more than 5A, the electric field threshold value is more than 500V, and the duration of the normal state is more than 5s, and whether the line is in the normal state can be accurately judged.
As one embodiment, the preset fault state current threshold is 800A, and the preset fault state duration threshold interval is 40ms-3 s. Specifically, a current threshold value of a fault state and a duration threshold value interval of the fault state may be preset first, in this embodiment of the present invention, the preset current threshold value of the fault state is greater than a range of the fault indicator, and the duration threshold value interval of the fault state is 40ms-3s, and for example, when the fault indicator reads that a current value of a detection point on a power distribution network line lasting for 2s is greater than a maximum range of the fault indicator, the line of the detection point is in the fault state. In the embodiment of the invention, considering that a power distribution network line may be excavated to generate a huge abrupt current, usually between 3500A and 4000A, the range of the fault indicator is only 800A, and the current value of the abrupt current in the line cannot be tested, so that the current threshold of the fault state can be preset to 800A. In addition, the short circuit fault of the power distribution network line is cut off by the circuit breaker, when the short circuit fault time is 40ms to 3s, the voltage can disappear after the fault is cut off, and according to the characteristics, when the current value of the fault state is more than 800A and the duration time of the fault state is 40ms to 3s, whether the power distribution network line has the fault state or not can be accurately judged when huge abrupt current is generated in the line.
As an implementation manner, the current threshold of the preset power-down state is 3A, and the drop detection time threshold of the preset power-down state is 120s. Specifically, a minimum threshold value of a current in a power-down state and a drop detection time threshold value of the power-down state may be preset first, and in the embodiment of the present invention, a method is as follows: the preset current threshold value of the power-down state is smaller than 3A, the drop detection time threshold value of the power-down state is larger than 120s, and when the fault indicator reads that the current value of the continuous 130s of the detection point on the power distribution network line is smaller than 3A and the current value is not 0, the line of the detection point is in the power-down state. In the embodiment of the invention, considering that a power distribution network line may be excavated to generate huge abrupt current, and long judging time is required for the line to be short-circuited and fault down to the line without electricity, the traditional abrupt current short-circuit fault judging method cannot judge whether the abrupt current in the line is short-circuited, so that when the current in the power-down state is less than 3A and the descending detection time threshold value of the power-down state is 120s, whether the power distribution network line has short-circuit fault or not can be accurately judged according to the detection result of the power-down state when the huge abrupt current is generated in the line.
As an implementation manner, the current threshold of the preset power-down state is 5A, and the drop detection time threshold of the preset power-down state is 60s. Specifically, a minimum threshold value of a current in a power-down state and a drop detection time threshold value of the power-down state may be preset first, and in the embodiment of the present invention, another method is as follows: the preset current threshold value of the power-down state is smaller than 5A, the drop detection time threshold value of the power-down state is larger than 60s, and when the fault indicator reads that the current value of the continuous 70s of the detection point on the power distribution network line is smaller than 5A and the current value is not 0, the line of the detection point is in the power-down state. In the embodiment of the invention, after the power distribution network line is in a fault state, the current value of the line is smaller than the rated current 5A, and is usually in a power-down state, so that when the current in the power-down state is smaller than 5A and the drop detection time threshold value of the power-down state is 60s, whether the power distribution network line has a short circuit fault or not can be accurately judged according to the detection result of the power-down state when a huge abrupt current is generated in the line.
As an embodiment, the method further comprises: if the sudden change current in the line is judged to have short circuit fault, determining the short circuit fault position of the sudden change current in the line according to a fault indicator; judging the risk level of the short circuit fault according to the short circuit fault position of the abrupt current in the line, and taking response measures according to the risk level of the short circuit fault. In the embodiment of the invention, when the abrupt current in the line has short-circuit fault, the short-circuit fault in the line can be post-processed, and the short-circuit fault position of the abrupt current in the line and the risk level of the short-circuit fault can be determined according to the fault indicator, and the response measures can be taken for the line with the short-circuit fault subsequently.
In the embodiment of the invention, a fault indicator is used to determine whether a short circuit fault occurs in a line, and fig. 2 is a schematic flow diagram of line detection by the fault indicator provided in the embodiment of the invention, specifically, in the embodiment of the invention, first, whether a monitoring point of a line to be detected is in a normal state is detected by using the fault indicator, if the electric field value of the detecting point on the power distribution network line read by the fault indicator is greater than 500V or the current value is greater than 5A, and the duration of the normal state exceeds 5s, the monitoring point of the line to be detected is in a normal state; secondly, detecting whether a monitoring point of the circuit to be detected has fault current by using a fault indicator, if the current value of a detection point of the circuit to be detected, which is read by the fault indicator, is larger than the maximum range of the fault indicator, and the duration time of the fault current is between 40ms and 3s, the monitoring point of the circuit to be detected has fault current, otherwise, the monitoring point of the circuit to be detected has no fault current, and the fault indicator detection is finished; thirdly, detecting whether the power failure state of residual current in the monitoring point of the line to be detected is normal or not by using a fault indicator, if the current value of the detection point of the line to be detected, which is read by the fault indicator, is smaller than 3A and the residual current drop detection time is longer than 120s, or if the current value of the detection point of the line to be detected, which is read by the fault indicator, is smaller than 5A and the residual current drop detection time is longer than 60s, then the monitoring point of the line to be detected has a short circuit fault, otherwise, the monitoring point of the line to be detected has no short circuit fault, and the fault indicator detection is ended; and finally, if the abrupt current in the line is judged to have short-circuit fault, the fault indicator makes a short-circuit fault indication action to indicate that the abrupt current in the line has short-circuit fault.
On the other hand, the present invention further provides a short-circuit fault determination system for abrupt current, please refer to fig. 3, fig. 3 is a schematic structural diagram of a short-circuit fault determination system for abrupt current provided by the embodiment of the present invention, the system includes: an obtaining module 31, configured to obtain a current value or an electric field value of a normal state of a line to be detected, a duration of the normal state, a current value of a fault state, a duration of the fault state, a current value of a power-down state, and a time for detecting a drop of the power-down state; a first comparing module 32, configured to compare the current value in the normal state with a preset current threshold in the normal state or compare the electric field value in the normal state with a preset electric field threshold in the normal state, and compare the duration of the normal state with a preset duration threshold in the normal state, so as to obtain a first comparison result; a second comparing module 33, configured to compare the current value of the fault state with a preset current threshold value of the fault state, and compare the duration of the fault state with the preset duration threshold interval of the fault state, so as to obtain a second comparison result; a third comparing module 34, configured to compare the current value of the power-down state with a preset current threshold of the power-down state, and compare the drop detection time of the power-down state with the drop detection time of the preset power-down state, so as to obtain a third comparison result; and the judging module 35 is configured to judge whether a short circuit fault occurs in the abrupt current in the line according to the first comparison result, the second comparison result, and the third comparison result.
The short-circuit fault judging system 30 for abrupt current provided in the embodiment of the present invention may execute the technical scheme of the short-circuit fault judging method for abrupt current in any of the above embodiments, and its implementation principle and beneficial effects are similar to those of the short-circuit fault judging method for abrupt current, and may refer to the implementation principle and beneficial effects of the short-circuit fault judging method for abrupt current, and will not be described herein.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure. As shown in fig. 4, the electronic device 40 includes a processor 41 and a memory 42 coupled to the processor 41. The memory 42 stores program instructions for implementing the short-circuit fault determination method of the abrupt current according to any of the above embodiments. The processor 41 is configured to execute program instructions stored in the memory 42 to perform short-circuit fault determination of the abrupt current. The processor 41 may also be referred to as a CPU (Central Processing Unit ). The processor 41 may be an integrated circuit chip with signal processing capabilities. Processor 41 may also be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
Referring to fig. 5, fig. 5 is a schematic diagram of a storage medium according to an embodiment of the invention. The storage medium 50 of the embodiment of the present invention stores the program instructions 51 capable of implementing the method for determining a short-circuit fault of a sudden-change current, where the program instructions 51 may be stored in the storage medium in the form of a software product, and include several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, an optical disk, or other various media capable of storing program codes, or a terminal device such as a computer, a server, a mobile phone, a tablet, or the like.
In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units. The foregoing is only the embodiments of the present invention, and the patent scope of the invention is not limited thereto, but is also covered by the patent protection scope of the invention, as long as the equivalent structures or equivalent processes of the present invention and the contents of the accompanying drawings are changed, or the present invention is directly or indirectly applied to other related technical fields.
Although the present invention has been described in terms of the preferred embodiments, it should be understood that the present invention is not limited to the specific embodiments, but is capable of numerous modifications and equivalents, and alternative embodiments and modifications of the embodiments described above, without departing from the spirit and scope of the present invention.
Claims (10)
1. A short-circuit fault judging method of abrupt current is characterized by comprising the following steps:
acquiring a current value or an electric field value of a normal state of a line to be detected, duration time of the normal state, a current value of a fault state, duration time of the fault state, a current value of a power-down state and a falling detection time of the power-down state;
comparing the current value of the normal state with a preset current threshold of the normal state or comparing the electric field value of the normal state with a preset electric field threshold of the normal state, and comparing the duration of the normal state with a preset duration threshold of the normal state to obtain a first comparison result;
comparing the current value of the fault state with a preset current threshold value of the fault state, and comparing the duration time of the fault state with a preset duration time threshold interval of the fault state to obtain a second comparison result;
comparing the current value of the power-down state with a preset current threshold of the power-down state, and comparing the falling detection time of the power-down state with the falling detection time of the preset power-down state to obtain a third comparison result;
and judging whether the abrupt current in the circuit has short circuit fault or not according to the first comparison result, the second comparison result and the third comparison result.
2. The method for determining a short-circuit fault of a sudden change current according to claim 1, wherein determining whether a sudden change current in a line has a short-circuit fault according to the first comparison result, the second comparison result, and the third comparison result comprises:
when meeting: the current value of the normal state is larger than the preset current threshold of the normal state or the electric field value of the normal state is larger than the preset electric field threshold of the normal state, and the duration of the normal state is larger than the duration threshold of the preset normal state;
the current value of the fault state is larger than the preset current threshold value of the fault state, and the duration time of the fault state belongs to the preset duration time threshold interval of the fault state;
when the current value of the power-down state is smaller than the current threshold value of the preset power-down state and the falling detection time of the power-down state is longer than the falling detection time threshold value of the preset power-down state, short circuit fault occurs to the abrupt current in the circuit;
otherwise, no short-circuit fault occurs in the abrupt current in the line.
3. The short-circuit fault determination method of abrupt current according to claim 2, wherein the preset current threshold in the normal state is 5A, the electric field threshold in the preset normal state is 500V, and the duration threshold in the preset normal state is 5s.
4. The method according to claim 3, wherein the current threshold of the preset fault state is 800A, and the duration threshold interval of the preset fault state is 40ms to 3s.
5. The method according to claim 4, wherein the current threshold of the preset power-down state is 3A, and the drop detection time threshold of the preset power-down state is 120s.
6. The method according to claim 4, wherein the current threshold of the preset power-down state is 5A, and the drop detection time threshold of the preset power-down state is 60s.
7. The short-circuit fault determination method of a sudden change of current according to claim 6, further comprising:
if the sudden change current in the line is judged to have short circuit fault, determining the short circuit fault position of the sudden change current in the line according to a fault indicator;
judging the risk level of the short circuit fault according to the short circuit fault position of the abrupt current in the line, and taking response measures according to the risk level of the short circuit fault.
8. A short-circuit fault determination system for abrupt current, comprising:
the acquisition module is used for acquiring a current value or an electric field value of a normal state of a line to be detected, duration time of the normal state, a current value of a fault state, duration time of the fault state, a current value of a power-down state and a falling detection time of the power-down state;
a first comparison module for comparing the current value of the normal state with a preset current threshold of the normal state or comparing the electric field value of the normal state with a preset electric field threshold of the normal state, and comparing the duration of the normal state with a preset duration threshold of the normal state to obtain
A first comparison result;
the second comparison module is used for comparing the current value of the fault state with a preset current threshold value of the fault state, and comparing the duration time of the fault state with a preset duration time threshold interval of the fault state to obtain a second comparison result;
the third comparison module is used for comparing the current value of the power-down state with a preset current threshold value of the power-down state, and comparing the falling detection time of the power-down state with the falling detection time of the preset power-down state to obtain a third comparison result;
and the judging module is used for judging whether the abrupt current in the circuit has short circuit fault or not according to the first comparison result, the second comparison result and the third comparison result.
9. An electronic device comprising a processor, and a memory coupled to the processor, the memory storing program instructions executable by the processor;
the processor, when executing the program instructions stored in the memory, implements the short-circuit fault determination method for abrupt current according to any one of claims 1 to 7.
10. A storage medium having stored therein program instructions which, when executed by a processor, implement a short circuit fault determination method capable of implementing the abrupt current according to any of claims 1 to 7.
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| CN202311768648.9A CN117741344A (en) | 2023-12-21 | 2023-12-21 | Short-circuit fault judging method, system, equipment and storage medium for abrupt current |
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