CN112748360A - Power distribution system fault detection method and device - Google Patents
Power distribution system fault detection method and device Download PDFInfo
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- CN112748360A CN112748360A CN202010220249.9A CN202010220249A CN112748360A CN 112748360 A CN112748360 A CN 112748360A CN 202010220249 A CN202010220249 A CN 202010220249A CN 112748360 A CN112748360 A CN 112748360A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention provides a power distribution system fault detection method, which comprises the following steps: determining fault detection points in a distribution line of a power distribution system, wherein the fault detection points are respectively arranged at two ends of the distribution line and at least two fault detection points are arranged; acquiring an electric parameter at the fault detection point of the distribution line according to the determined fault detection point of the distribution line, and generating a detection graph at the fault detection point; and selecting characteristic points in the detection graphs of the at least two fault detection points for comparison, and analyzing to obtain the fault type of the distribution line according to the comparison result. The method can efficiently and safely detect the distribution line with the fault, so that the distribution line is always in the optimal protection state, and the safety and the reliability of a power distribution system are obviously improved.
Description
Technical Field
The invention belongs to the technical field of power protection, and particularly relates to a power distribution system fault detection method and device.
Background
With the development of modern society, high-rise buildings are more and more, various electric equipment is more and more complex, and higher requirements are put forward on the safety of a power distribution system. At present, the fault detection of the existing power distribution system mainly detects whether the current or voltage value in a power distribution line exceeds a set threshold value, if so, the circuit is considered to have a fault, and a circuit breaker is used for cutting off the circuit, so that the safety protection of the power distribution line is realized.
Particularly, the leakage fault, the fault with overlarge contact resistance and the grounding arc fault in the faults of the distribution lines are the faults which are difficult to detect thoroughly in the existing lines. The traditional leakage fault detection method is easily influenced by load, and the leakage fault point is difficult to determine; the fault of overlarge contact resistance can only be measured by a temperature sensor at present, while the traditional point type temperature measuring sensor can only monitor the temperature of one point, so that the detection of a long line has certain limitation, and a line type temperature measuring device is difficult to be generally used due to too high price; existing methods of detecting ground arc faults are also susceptible to load characteristics, and the location of the fault is difficult to determine.
Therefore, a safe and efficient fault detection method suitable for the existing power distribution system and power distribution line is needed to protect the safety of power utilization.
Disclosure of Invention
In order to solve the above problems, an embodiment of the present invention provides a power distribution system fault detection method for detecting a leakage fault, an excessive contact resistance fault, and a ground arc fault of a distribution line and a distribution device in a power distribution system, the method including:
determining fault detection points in a distribution line of a power distribution system, wherein the fault detection points are respectively arranged at two ends of the distribution line and at least two fault detection points are arranged;
acquiring an electric parameter at the fault detection point of the distribution line according to the determined fault detection point of the distribution line, and generating a detection graph at the fault detection point;
and selecting characteristic points in the detection graphs of the at least two fault detection points for comparison, and analyzing to obtain the fault type of the distribution line according to the comparison result. Preferably, the electrical parameters include current, voltage and distribution line status of the distribution line.
Further, in the step of generating the detection pattern at the fault detection point, the detection pattern refers to an electrical parameter waveform pattern and/or an electrical parameter data pattern.
Preferably, the electrical parameters refer to current, voltage and distribution line state of the distribution line.
Further, in the step of selecting and comparing the feature points in the detection graph at the fault detection point, the feature points of the detection graph refer to at least one of frequency, slope, peak value, harmonic component and abrupt change feature.
Further, before the step of obtaining the electrical parameters of the fault detection points of the distribution lines and generating the detection graphs of the fault detection points according to the determined fault detection points of the distribution lines, a learning period is set, and the electrical parameters of the fault monitoring points obtained in the learning period are used for generating the reference detection graphs of the fault detection points.
Further, the method also comprises the step of starting an alarm mode when the fault type of the distribution line is analyzed, wherein the alarm mode comprises at least one of the following steps: sound, light, vibration. .
The invention also provides a power distribution system fault detection device, which is used for detecting the leakage fault, the contact resistance overlarge fault and the grounding arc fault of a power distribution line in the power distribution system, and the device comprises:
the device comprises a determining unit, a judging unit and a judging unit, wherein the determining unit is used for determining fault detection points in a distribution line of a power distribution system, and the fault detection points are respectively arranged at two ends of the distribution line and are at least two;
the acquisition unit is used for acquiring electric parameters at the fault detection point of the distribution line according to the determined fault detection point of the distribution line, wherein the electric parameters comprise the current and the voltage of the distribution line and the state of the distribution line;
the generating unit is used for generating a detection graph at the fault detection point according to the determined electric parameters at the fault detection point of the distribution line, wherein the detection graph comprises an electric parameter oscillogram and/or an electric parameter data graph;
and the analysis unit is used for selecting and comparing the characteristic points in the detection graphs at the at least two fault detection points and analyzing the type of the fault of the distribution line according to the comparison result.
Furthermore, the device also comprises a learning unit, wherein the learning unit is used for setting a learning period and generating a reference detection graph at the fault detection point according to the electric parameters at the fault detection point acquired in the learning period.
Furthermore, the fault detection device also comprises a human-computer interaction device, when the same fault detection device is connected with two fault detection points, or the two fault detection devices are respectively connected with the two fault detection points, one or two fault detection devices are communicated with each other through a bus or a network cable and are communicated with the human-computer interaction device, so that the generation and the comparison of the detection graphs at the fault detection points are realized.
Preferably, the human-computer interaction device can be a display screen, a touch screen, a tablet computer, a mobile phone or a keyboard.
Further, the distribution line fault diagnosis device further comprises an alarm device, and when the fault type of the distribution line is analyzed and obtained, an alarm mode is started, wherein the alarm mode comprises at least one of the following modes: sound, light, vibration.
The invention also provides a computer implemented program comprising a computer executable power distribution system fault detection method.
The method and the device for detecting the power distribution system fault have the advantages that: under the condition of multiple lines of a distribution line in a distribution system, electric parameters of fault detection points are obtained by selecting the fault detection points from two ends of the lines to generate a detection graph, and the type of the distribution line fault, such as a leakage fault, an overlarge contact resistance fault and a grounded arc fault, can be analyzed by comparing characteristic points of the detection graph. By the detection method, faults of the distribution lines can be efficiently and safely detected, the distribution lines are always in the optimal protection state, and the safety and the reliability of a distribution system are obviously improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from these without inventive effort.
Fig. 1 is a flowchart of a method for detecting a fault in a power distribution system according to an embodiment of the present invention;
fig. 2 is a flowchart of a power distribution system fault detection method according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a power distribution system fault detection apparatus according to a third embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Example one
Fig. 1 is a flowchart of a method for detecting a fault in a power distribution system according to an embodiment of the present invention. As shown in fig. 1, a method for detecting a fault of a power distribution system according to an embodiment of the present invention is used for detecting a leakage fault, an excessive contact resistance fault, and a ground arc fault of a distribution line and distribution equipment in the power distribution system, and the method includes:
102, acquiring an electric parameter at a fault detection point of the distribution line according to the determined fault detection point of the distribution line, and generating a detection graph at the fault detection point;
and 103, selecting characteristic points in the detection graphs of the at least two fault detection points for comparison, and analyzing to obtain the fault type of the distribution line according to the comparison result.
Specifically, determining the fault detection point in the distribution line means determining at least two detection points (for example, a and B) as the fault detection points at two ends of a main line or a branch line of the distribution line, generally installing sensors at the two points a and B, simultaneously connecting the sensors at the two points a and B by using one acquisition device, or connecting the sensors at the two points a and B by using two acquisition devices. The electrical parameters of A, B two points are obtained by a sensor and an acquisition device, wherein the electrical parameters refer to the current, the voltage and the distribution line state of the distribution line, one or two of the electrical parameters can be selected for measurement, and a detection graph of A, B two points is generated, wherein the detection graph refers to an electrical parameter waveform graph and/or an electrical parameter data graph. And comparing the characteristic points in the detection graph, wherein the characteristic points refer to at least one of frequency, slope, peak value, harmonic component and mutation characteristic. And finally, analyzing according to the comparison result to obtain the type of the fault of the distribution line, specifically which one of the leakage fault, the fault with overlarge contact resistance and the grounding arc fault of the distribution line occurs.
In this embodiment, the current at A, B two points in the distribution line is obtained, a current waveform diagram at A, B two points is generated, and the current waveform diagrams at A, B two points are compared to determine whether the current waveforms are the same. Specifically, whether the current waveforms are consistent or not is judged through at least one characteristic value of the frequency, the slope, the peak value, the harmonic component and the abrupt change characteristic of the current waveforms. Generally, when no fault occurs between A, B points, the current waveforms and waveform changes generated by A, B points should be the same or similar, when a fault occurs between A, B points, the resistance is increased, and the current waveforms and waveform changes generated by a point a or a point B are greatly different, so that the fault of the distribution line between A, B points can be directly reflected, and the specific types of the leakage fault, the fault with excessive contact resistance and the grounding arc fault can be analyzed according to the shapes of the waveforms. In general, when a leakage fault occurs, the current change of two detection points can be rapidly increased, so that a wave crest in a wave pattern is very prominent; when the contact resistance is overlarge and the fault occurs, the current waveform of the tail end detection point is smaller than the normal waveform of the front end detection point; when the earth arc fault occurs, the current waveforms of the two detection points are not sinusoidal waveforms and have fluctuation changes at the peak value.
When the waveform diagram of the current is selected and analyzed in this embodiment, it is needless to say that the waveform diagram of the voltage and the waveform diagram formed by the distribution line states can also be compared, and the type of the fault occurring in the distribution line can be analyzed and obtained.
By adopting the power distribution system fault detection method provided by the embodiment of the invention, under the condition of multiple lines of a power distribution line in the power distribution system, the electrical parameters of the fault detection points are obtained by selecting the fault detection points from the two ends of the lines, the detection graph is generated, and the type of the power distribution line fault, such as the leakage fault, the fault with overlarge contact resistance and the grounding arc fault, can be analyzed by comparing the characteristic points of the detection graph. By the detection method, faults of the distribution lines can be efficiently and safely detected, the distribution lines are always in the optimal protection state, and the safety and the reliability of a distribution system are obviously improved.
For simplicity of explanation, the method embodiments are described as a series of acts or combinations, but those skilled in the art will appreciate that the embodiments are not limited by the order of acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the embodiments of the invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Example two
Fig. 2 is a flowchart of a power distribution system fault detection method according to a second embodiment of the present invention. As shown in fig. 2, a power distribution system fault detection method according to a second embodiment of the present invention is used for detecting a leakage fault, a contact resistance excessive fault, and a ground arc fault of a distribution line in a power distribution system, and the method includes:
and 204, selecting characteristic points in the detection graphs of the at least two fault detection points for comparison, and analyzing to obtain the fault type of the distribution line according to the comparison result.
Compared with the implementation method of the first embodiment, the implementation method of the second embodiment adds step 202 before step 203, sets a learning period, and generates a reference detection pattern at the fault detection point according to the electrical parameters at the fault detection point acquired in the learning period.
Specifically, the learning process may be to select at least two fault detection points (a, B) on a main line or a branch line in a distribution line of the distribution system. Setting a learning period T, wherein the time of the general T does not exceed 10s, acquiring A, B two-point current, and generating A, B two-point current waveform. And generating a reference current waveform, which is generally a standard sine waveform and is used for representing no fault at the fault detection point through current waveform correction of A, B points in one period T. When the current waveforms of the A, B points acquired in the subsequent step are different from the reference current waveform, the type of the fault of the distribution line can be judged. By setting the learning period to generate the detection graph at the detection point, the fault type of the distribution line can be determined more accurately and more efficiently. When the fault detection point is analyzed to have a fault, starting an alarm mode, wherein the alarm mode can be at least one of the following modes: sound, light, vibration. In order to facilitate related personnel to quickly know that the distribution line has faults, the distribution line can be reminded in a sound, light or vibration mode.
Specifically, the current waveform diagrams generated at A, B are used to compare whether the current waveform sizes at A, B are consistent, and the method may be to determine whether the current waveform sizes are consistent according to at least one characteristic value of the frequency, the slope and the peak of the current waveform, so as to directly reflect the type of fault occurring in the distribution line between A, B two points. And when A, B two points have faults, a Time Domain Reflectometer (TDR) function is started, and the specific fault position of the fault distribution line can be measured.
According to the embodiment, the learning function is utilized, the fault type of the power distribution line can be judged more accurately, accurate information is provided for related personnel, timely repair is guaranteed, and the safety of the power distribution line is guaranteed.
EXAMPLE III
Fig. 3 is a distribution system fault detection apparatus 300 according to a third embodiment of the present invention, configured to detect a leakage fault, a contact resistance excessive fault, and a ground arc fault of a distribution line in a distribution system, where the fault detection apparatus 300 includes:
the device comprises a determining unit 301, wherein the determining unit 301 is used for determining fault detection points in a distribution line of a power distribution system, and the fault detection points are respectively arranged at two ends of the distribution line and are at least two;
the obtaining unit 302 is configured to obtain an electrical parameter at a fault detection point of the distribution line according to the determined fault detection point of the distribution line, where the electrical parameter includes current and voltage of the distribution line and a state of the distribution line;
the generating unit 303 is used for generating a detection graph at the fault detection point according to the determined electric parameters at the fault detection point of the distribution line, wherein the detection graph comprises an electric parameter oscillogram and/or an electric parameter data graph;
and the analysis unit 304 is used for selecting and comparing the feature points in the detection graphs at the at least two fault detection points, and analyzing the fault type of the distribution line according to the comparison result.
Further, the fault detection apparatus 300 further includes a learning unit 305, where the learning unit 305 is configured to set a learning period, and generate a reference detection pattern at the fault detection point according to the electrical parameter at the fault detection point acquired in the learning period.
Further, the fault detection device 300 further includes a human-computer interaction device 306, in the power distribution system, two fault detection points may be connected to the same fault detection device 300, or two fault detection devices 300 are respectively connected to two fault detection points, wherein the one or two fault detection devices 300 communicate with each other through a bus or a network cable and communicate with the human-computer interaction device 306, so as to realize generation and comparison of detection patterns at the fault detection points. The human-computer interaction device can be a display screen, a touch screen, a tablet computer, a mobile phone or a keyboard. The human-computer interaction device 306 may be a server, an upper computer, a tablet computer, a mobile phone or a keyboard. In this embodiment, human-computer interaction device 306 is the host computer, and through the host computer, the user can the fault type that takes place in the direct observation distribution lines, can also report to the police through the host computer when the distribution lines breaks down.
By adopting the power distribution system fault detection device in the third embodiment of the invention, under the condition of multiple lines of a power distribution line in the power distribution system, the electrical parameters of the fault detection points are obtained by selecting the fault detection points from the two ends of the lines, a detection graph is generated, and the type of the power distribution line fault, such as a leakage fault, an overlarge contact resistance fault and a grounded arc fault, can be analyzed by comparing the characteristic points of the detection graph. By the detection method, faults of the distribution lines can be efficiently and safely detected, the distribution lines are always in the optimal protection state, and the safety and the reliability of a distribution system are obviously improved.
It should be noted that, in the respective components of the apparatus of the present invention, the components therein are logically divided according to the functions to be implemented, but the present invention is not limited thereto, and the respective components may be re-divided or combined as needed, for example, some components may be combined into a single component, or some components may be further decomposed into more sub-components.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components in a system according to embodiments of the present invention.
Example four
The invention may also be a computer implemented program comprising computer executable instructions for performing the method of detecting a fault in a power distribution system according to the first and second embodiments. May be embodied as an apparatus or device program and program product for performing a portion or all of the methods described herein.
Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
The method for detecting the fault of the power distribution system provided by the first embodiment and the second embodiment can be independently adapted to a computer software program and can be installed and used in a terminal server, an upper computer or power distribution equipment of any power distribution system.
It should be noted that any of the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second, previous, next, etc. does not indicate any ordering. These words may be interpreted as names.
The above embodiments are only suitable for illustrating the present invention and not limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so that all equivalent technical solutions also belong to the scope of the present invention, and the scope of the present invention should be defined by the claims.
Claims (12)
1. A method for detecting faults in a power distribution system, the method for detecting leakage faults, contact resistance faults, and ground arc faults in distribution lines and distribution equipment in the power distribution system, the method comprising:
determining fault detection points in a distribution line of a power distribution system, wherein the fault detection points are respectively arranged at two ends of the distribution line and at least two fault detection points are arranged;
acquiring an electric parameter at the fault detection point of the distribution line according to the determined fault detection point of the distribution line, and generating a detection graph at the fault detection point;
and selecting characteristic points in the detection graphs of the at least two fault detection points for comparison, and analyzing to obtain the fault type of the distribution line according to the comparison result.
2. The power distribution system fault detection method of claim 1, wherein in the step of generating a detection pattern at the fault detection point, the detection pattern is an electrical parameter oscillogram and/or an electrical parameter data graph.
3. The power distribution system fault detection method of claim 1 or 2, wherein: the electric parameters refer to the current, the voltage and the state of the distribution line.
4. The power distribution system fault detection method of claim 1, wherein: and in the step of selecting and comparing the characteristic points in the detection graph at the fault detection point, the characteristic points of the detection graph refer to at least one of frequency, slope, peak value, harmonic component and abrupt change characteristic.
5. The method according to claim 1, wherein before the steps of obtaining the electrical parameters at the fault detection point of the distribution line according to the determined fault detection point of the distribution line and generating the detection pattern at the fault detection point, the method further comprises: and setting a learning period, and generating a reference detection graph at the fault detection point according to the electric parameters at the fault detection point acquired in the learning period.
6. The method of claim 1, further comprising activating an alarm mode upon analyzing the type of fault occurring on the distribution line, wherein the alarm mode includes at least one of: sound, light, vibration.
7. A distribution system fault detection device for detecting leakage faults, contact resistance excess faults and earth arc faults of distribution lines in a distribution system, the device comprising:
the device comprises a determining unit, a judging unit and a judging unit, wherein the determining unit is used for determining fault detection points in a distribution line of a power distribution system, and the fault detection points are respectively arranged at two ends of the distribution line and are at least two;
the acquisition unit is used for acquiring electric parameters at the fault detection point of the distribution line according to the determined fault detection point of the distribution line, wherein the electric parameters comprise the current and the voltage of the distribution line and the state of the distribution line;
the generating unit is used for generating a detection graph at the fault detection point according to the determined electric parameters at the fault detection point of the distribution line, wherein the detection graph comprises an electric parameter oscillogram and/or an electric parameter data graph;
and the analysis unit is used for selecting and comparing the characteristic points in the detection graphs at the at least two fault detection points and analyzing the type of the fault of the distribution line according to the comparison result.
8. The power distribution system fault detection device of claim 7, further comprising a learning unit configured to set a learning period, and generate a reference detection pattern at the fault detection point from the electrical parameter at the fault detection point acquired in the learning period.
9. The power distribution system fault detection device of claim 7, wherein the fault detection device further comprises a human-computer interaction device, and when the same fault detection device is connected with two fault detection points, or two fault detection devices are respectively connected with two fault detection points, one or two fault detection devices communicate with each other through a bus or a network cable and communicate with the human-computer interaction device, so as to generate and compare detection graphs at the fault detection points.
10. The power distribution system fault detection device of claim 9, wherein the human-computer interaction device is a display screen, a touch screen, a tablet computer, a mobile phone or a keyboard.
11. The distribution system fault detection device of claim 7, further comprising an alarm device configured to initiate an alarm mode upon analyzing a type of fault occurring on the distribution line, wherein the alarm mode includes at least one of: sound, light, vibration.
12. A computer implemented program comprising computer executable power distribution system fault detection methods as claimed in claims 1 to 6.
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| CN101813740A (en) * | 2010-05-13 | 2010-08-25 | 天津市翔晟远电力设备实业有限公司 | System and method for detecting high voltage transmission line faults |
| CN204464976U (en) * | 2015-03-13 | 2015-07-08 | 珠海兴业绿色建筑科技有限公司 | A kind of DC bus protective device |
| CN204992785U (en) * | 2015-10-12 | 2016-01-20 | 南京捷泰电力设备有限公司 | Take low voltage network monitored control system of trouble early warning and diagnostic function |
| CN107370124A (en) * | 2016-05-13 | 2017-11-21 | 上海电科电器科技有限公司 | Method for detecting arc |
| CN110098591A (en) * | 2018-01-27 | 2019-08-06 | 天津市中力神盾电子科技有限公司 | Self-adaptive protection method and device |
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- 2020-03-25 CN CN202010220249.9A patent/CN112748360A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101813740A (en) * | 2010-05-13 | 2010-08-25 | 天津市翔晟远电力设备实业有限公司 | System and method for detecting high voltage transmission line faults |
| CN204464976U (en) * | 2015-03-13 | 2015-07-08 | 珠海兴业绿色建筑科技有限公司 | A kind of DC bus protective device |
| CN204992785U (en) * | 2015-10-12 | 2016-01-20 | 南京捷泰电力设备有限公司 | Take low voltage network monitored control system of trouble early warning and diagnostic function |
| CN107370124A (en) * | 2016-05-13 | 2017-11-21 | 上海电科电器科技有限公司 | Method for detecting arc |
| CN110098591A (en) * | 2018-01-27 | 2019-08-06 | 天津市中力神盾电子科技有限公司 | Self-adaptive protection method and device |
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