CN117154649A - Power supply line control method and system - Google Patents
Power supply line control method and system Download PDFInfo
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- CN117154649A CN117154649A CN202311358470.0A CN202311358470A CN117154649A CN 117154649 A CN117154649 A CN 117154649A CN 202311358470 A CN202311358470 A CN 202311358470A CN 117154649 A CN117154649 A CN 117154649A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 153
- 238000002955 isolation Methods 0.000 claims abstract description 34
- 230000009471 action Effects 0.000 claims description 21
- 238000005070 sampling Methods 0.000 claims description 15
- 230000009466 transformation Effects 0.000 claims description 10
- 238000012423 maintenance Methods 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 6
- 230000003334 potential effect Effects 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 claims description 6
- 230000001939 inductive effect Effects 0.000 claims description 5
- 230000000007 visual effect Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 4
- 230000035772 mutation Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/325—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors involving voltage comparison
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- Emergency Protection Circuit Devices (AREA)
Abstract
The application discloses a power supply line control method and a power supply line control system, and relates to the technical field of line control. The method comprises the following steps: node division is carried out on the power supply line; detecting the voltage, current and potential of each node to obtain a detection result; judging the position of a node where electric leakage occurs according to the detection result; and carrying out line control according to the node position, and communicating the leakage phase line with a zero line through an isolation transformer to form a closed loop. According to the application, the power supply line is divided into a plurality of detection nodes, the detection nodes are subjected to comprehensive sectional detection of multiple factors including voltage, current and potential, the generated leakage signal is tracked and positioned to determine the leakage position, and finally, the switching and control of the power supply line are realized through the control switch and the isolation transformer, so that the stable operation of the power supply line is ensured.
Description
Technical Field
The application belongs to the technical field of circuit control, and particularly relates to a power supply circuit control method and system.
Background
In urban power supply systems, a power supply network consisting of power supply lines plays an important role therein. The stability of the operation of the power supply network can be directly influenced by the stability of the whole urban power supply system, and tripping caused by the leakage of the power supply line is one of the important factors influencing the operation of the power supply network. The existing solution to the tripping situation is to replace the power supply cable which causes electric leakage, but a great deal of manpower and material resources are needed to be input for replacing the cable; in addition, the prior art can reduce the voltage in the power supply circuit, so that the safety of people is not affected even if electric leakage occurs, but the voltage is reduced, and the electric equipment in the circuit can also influence the normal operation of the equipment because the rated voltage cannot be supplied. Therefore, how to effectively treat the power supply circuit in the presence of leakage and time, so as to ensure the stable operation of the power supply circuit is a technical problem to be solved.
Disclosure of Invention
The application aims to provide a power supply line control method and a power supply line control system, wherein a power supply line is divided into a plurality of detection nodes, the detection nodes are subjected to comprehensive sectional detection of multiple factors including voltage, current and potential, generated leakage signals are tracked and positioned to determine the leakage position, and finally, a control switch and an isolation transformer are used for realizing switching and control of the power supply line, so that stable operation of the power supply line is ensured.
The aim of the application can be achieved by the following technical scheme:
in a first aspect, an embodiment of the present application provides a power supply line control method, including the following steps:
node division is carried out on the power supply line;
detecting the voltage, current and potential of each node to obtain a detection result;
judging the position of a node where electric leakage occurs according to the detection result;
line control is carried out according to the node position, and a leakage phase line is communicated with a zero line through an isolation transformer to form a closed loop;
the coil ratio in the isolation transformer is 1:1;
wherein the line control includes one or more of communicating the leaky phase line with the neutral line via the isolation transformer, cutting off the leaky phase line, switching non-leaky phase line to communicate with the neutral line, and communicating a leaky alarm device;
the electric leakage alarm device is used for sending out audible and visual alarm information and prompting maintenance personnel to carry out line maintenance.
Preferably, the power supply circuit is controlled, and the method specifically further comprises the following steps:
dividing the power supply line into a plurality of detection nodes;
detecting the voltage in the detection node to obtain a voltage detection result;
detecting the current in the detection node to obtain a current detection result;
detecting the potential of two adjacent nodes in the detection nodes to obtain a potential detection result;
analyzing and processing the voltage detection result, the current detection result and the potential detection result to obtain a leakage signal;
tracking the leakage signal, judging the node position of the power supply line where the leakage condition occurs according to the leakage signal, and positioning a leakage phase line;
amplifying the leakage signal to obtain an amplified signal;
and controlling a control switch in the power supply line to perform line control according to the amplified signal.
Preferably, the detecting the voltage in the detection node specifically includes the following steps:
sampling the output voltage of the detection node according to a proportion to obtain a sampling voltage;
acquiring historical voltage data of the power supply line, and generating a reference voltage;
judging the magnitudes of the sampling voltage and the reference voltage through a comparator, and outputting the voltage detection result and a voltage action signal if the sampling voltage is lower than the reference voltage;
the positive electrode input end of the comparator is connected with the sampling voltage, and the negative electrode input end of the comparator is connected with the reference voltage;
the voltage action signal is used for controlling the control switch to conduct line control.
Preferably, the detecting the current in the detection node specifically includes the following steps:
collecting historical current data in the power supply line, and obtaining a current threshold value It;
collecting real-time current data in the detection node, and obtaining the current IA;
comparing the current threshold It with the current IA, and outputting the current detection result if the current IA is greater than the current threshold It.
Preferably, a zero sequence current transformer for inducing leakage faults is sleeved on the power supply line, and a current action signal is output when the current IA is greater than the current threshold value It; the current action signal is used for controlling the control switch to conduct line control.
Preferably, the detecting the potential of two adjacent nodes in the detecting nodes specifically includes the following steps:
collecting historical potential data of the detection node, and generating a potential threshold value;
collecting real-time potential data of the detection node to generate a current potential;
acquiring the real-time potential data of two adjacent detection nodes to generate a real-time potential difference;
acquiring the historical potential data of two adjacent detection nodes, and generating a potential difference threshold;
comparing the current potential with the potential threshold, and outputting the potential detection result if the current potential is smaller than the potential threshold;
comparing the time potential difference with the potential difference threshold, and outputting a potential action signal if the time potential difference is smaller than the potential difference threshold; the potential action signal is used for controlling the control switch to conduct line control.
Preferably, a zero-phase current transformer is arranged on the power supply line, so that an alternating current circuit of the power supply line penetrates through the zero-phase current transformer; the leakage signal is obtained according to the zero-phase current transformer and the voltage detection result, and the method specifically comprises the following steps:
detecting the voltage waveform output by the zero-phase current transformer;
acquiring turning points of the voltage waveform and counting the number of the turning points;
outputting a waveform action signal if the number of turning points reaches a specified number;
and generating the leakage signal according to the waveform action signal and the voltage action signal.
Preferably, the positioning method of wavelet based on the mode maximum value is used for positioning the leakage phase line, and the adopted formula is as follows:
；
wherein,wavelet transformation representing a traveling wave; />Representing a transient signal;
representing a wavelet function; t represents the moment;
s represents a scale factor, whereinZ represents an integer.
Preferably, the isolating transformer is detected at regular time to determine whether it is in overload state, which comprises the following steps:
acquiring a rated load range of the isolation transformer, and setting an overload threshold;
performing timing detection on the isolation transformer to obtain a real-time load value;
and judging the magnitude of the real-time load value and the overload threshold, and if the real-time load value is larger than or equal to the overload threshold, cutting off the closed loop.
In a second aspect, an embodiment of the present application provides a power supply line control system, including a node dividing module, a voltage detecting module, a current detecting module, a potential detecting module, a leakage positioning module, and a line control module;
the node dividing module and the line control module are respectively in communication connection with the voltage detection module, the current detection module and the potential detection module;
the node dividing module is used for dividing the power supply line into a plurality of detection nodes;
the voltage detection module is used for detecting the voltage in the detection node and obtaining a voltage detection result;
the current detection module is used for detecting the current in the detection node and obtaining a current detection result;
the potential detection module is used for detecting the potentials of two adjacent nodes in the detection nodes to obtain potential detection results;
the electric leakage positioning module is used for generating an electric leakage signal according to the voltage detection result, the current detection result and the potential detection result; determining the node position of the power supply line where the leakage condition occurs by tracking the leakage signal, and positioning a leakage phase line;
the circuit control module is used for amplifying the leakage signal to obtain an amplified signal; and controlling a control switch in the power supply line to perform line control according to the amplified signal.
The beneficial effects of the application are as follows:
(1) According to the application, the power supply line is divided into a plurality of detection nodes, the detection nodes are subjected to comprehensive sectional detection of multiple factors including voltage, current and potential, the generated leakage signal is tracked and positioned to determine the leakage position, and finally, the switching and control of the power supply line are realized through the control switch and the isolation transformer, so that the stable operation of the power supply line is ensured.
(2) The application sets the comparator in the voltage detection to compare the sampled voltage with the reference voltage, can rapidly and accurately compare the signal size and generate corresponding output, thereby improving the real-time performance and accuracy of the power supply line control.
(3) The zero sequence current transformer for inducing the leakage fault is sleeved on the power supply line, and when the current is larger than the current threshold value, a current action signal for controlling the switch to perform line control can be output; the zero-sequence current can be accurately and rapidly detected and measured through the zero-sequence current transformer, so that the protection and detection of the ground fault are realized, and the safety, stability and reliability of the power supply network are improved.
(4) The application sets zero-phase current transformer on the power supply line, which makes the alternating current circuit of the power supply line pass through the zero-phase current transformer, and obtains the leakage signal according to the zero-phase current transformer and the voltage detection result; by utilizing the advantages of the zero-phase current transformer, such as accurate measurement characteristic, low phase difference, wide frequency range, linear output and the like, the accurate measurement of alternating current in a power supply circuit is realized, and corresponding circuit protection and control are realized.
(5) The application adopts a wavelet positioning method based on a mode maximum value to position the leakage phase line, and the mode value representation of wavelet transformation can accurately describe the amplitude value of a signal mutation point; when the power supply line fails, the fault transient waveform can be suddenly changed at the time of the fault, so that the modulus value of the wavelet transformation can reach an extreme value. Therefore, by selecting the modulus maximum of the wavelet transform, the failure moment can be detected. The method has the advantages of high precision, multi-scale analysis, adaptability, real-time performance, high efficiency, noise immunity and the like, so that the method can be used for rapidly and accurately positioning the electric leakage position in the power supply line.
(6) According to the application, the phase line with electric leakage is connected with the zero line by adopting the isolation transformer with the coil ratio of 1:1, and the voltage which is the same as the power supply voltage is provided for subsequent electric equipment by the isolation transformer, so that the subsequent electric equipment can stably operate; and the isolation transformer provides safe, reliable and stable guarantee for the power supply and the electric equipment through the functions of electric isolation, voltage reduction/boosting, voltage regulation and the like.
(7) The application also sets timing detection for the isolation transformer to prevent performance degradation caused by excessive use, thereby influencing the use of electric equipment and endangering surrounding people; the application also provides a leakage alarm device which is used for sending out audible and visual alarm information and prompting an maintainer to timely maintain the leakage phase line, thereby ensuring the safety of the power supply line and the timeliness of leakage treatment.
Drawings
For a better understanding and implementation, the technical solution of the present application is described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of steps of a power supply line control method according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a power supply line control system according to an embodiment of the present application.
Detailed Description
For further explanation of the technical means and effects adopted by the present application for achieving the intended purpose, exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of methods and systems that are consistent with aspects of the application as detailed in the accompanying claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to any or all possible combinations including one or more of the associated listed items.
The following detailed description of specific embodiments, features and effects according to the present application is provided with reference to the accompanying drawings and preferred embodiments.
Example 1
Referring to fig. 1, an embodiment of the present application provides a power supply line control method, including the following steps:
s1, carrying out node division on a power supply line;
s2, detecting the voltage, current and potential of each node, and obtaining a detection result;
s3, judging the position of a node where electric leakage occurs according to the detection result;
s4, line control is carried out according to the node position, and the leakage phase line is communicated with a zero line through an isolation transformer to form a closed loop;
the coil ratio in the isolation transformer is 1:1;
wherein the line control includes one or more of communicating the leaky phase line with the neutral line via the isolation transformer, cutting off the leaky phase line, switching non-leaky phase line to communicate with the neutral line, and communicating a leaky alarm device;
the electric leakage alarm device is used for sending out audible and visual alarm information and prompting maintenance personnel to carry out line maintenance.
In one embodiment of the present application, the power supply circuit is controlled, and the method specifically further includes the following steps:
s101, dividing a power supply line into a plurality of detection nodes;
s102, detecting the voltage in the detection node to obtain a voltage detection result;
s103, detecting the current in the detection node to obtain a current detection result;
s104, detecting the potential of two adjacent nodes in the detection nodes to obtain a potential detection result;
s105, analyzing and processing the voltage detection result, the current detection result and the potential detection result to obtain a leakage signal;
s106, tracking the leakage signal, judging the node position of the leakage condition in the power supply line according to the leakage signal, and positioning a leakage phase line;
s107, amplifying the leakage signal to obtain an amplified signal;
s108, controlling a control switch in the power supply line to perform line control according to the amplified signal.
In one embodiment of the present application, the voltage in the detection node is detected, which specifically includes the following steps:
s11, sampling the output voltage of the detection node according to a proportion to obtain a sampling voltage;
s12, acquiring historical voltage data of a power supply line and generating a reference voltage;
s13, judging the magnitudes of the sampling voltage and the reference voltage through a comparator, and outputting a voltage detection result and a voltage action signal if the sampling voltage is lower than the reference voltage;
the positive electrode input end of the comparator is connected with the sampling voltage, and the negative electrode input end of the comparator is connected with the reference voltage; the voltage action signal is used for controlling the control switch to conduct line control.
In one embodiment of the present application, detecting the current in the detection node specifically includes the following steps:
s21, collecting historical current data in a power supply line, and obtaining a current threshold I t ；
S22, collecting real-time current data in the detection node to obtain the current I A ；
S23, the current threshold I t With current I A Comparing if the current I A Greater than the current threshold I t And outputting a current detection result.
Advancing oneThe zero sequence current transformer for inducing leakage fault is sleeved on the power supply line and is used as the current I A Greater than the current threshold I t Outputting a current action signal; the current action signal is used for controlling the switch to conduct line control.
In one embodiment provided by the application, the method for detecting the potential of two adjacent nodes in the detection nodes specifically comprises the following steps:
s31, collecting historical potential data of the detection node, and generating a potential threshold value;
s32, collecting real-time potential data of the detection node, and generating a current potential;
s33, acquiring real-time potential data of two adjacent detection nodes, and generating a real-time potential difference;
s34, acquiring historical potential data of two adjacent detection nodes, and generating a potential difference threshold;
s35, comparing the current potential with a potential threshold, and outputting a potential detection result if the current potential is smaller than the potential threshold;
s36, comparing the time potential difference with a potential difference threshold value, and outputting a potential action signal if the time potential difference is smaller than the potential difference threshold value; the potential action signal is used for controlling the switch to perform line control.
In one embodiment provided by the application, a zero-phase current transformer is arranged on a power supply line, so that an alternating current circuit of the power supply line penetrates through the zero-phase current transformer; the leakage signal is obtained according to the zero-phase current transformer and the voltage detection result, and the method specifically comprises the following steps:
s41, detecting a voltage waveform output by the zero-phase current transformer;
s42, acquiring turning points of the voltage waveform and counting the number of the turning points;
s43, outputting a waveform action signal if the number of turning points reaches a specified number;
s44, generating a leakage signal according to the waveform operation signal and the voltage operation signal.
In one embodiment of the present application, a wavelet positioning method based on a mode maximum is used to position the leakage phase line, and the formula adopted is as follows:
；
wherein,wavelet transformation representing a traveling wave; />Representing a transient signal;
representing a wavelet function; t represents the moment;
s represents a scale factor, whereinZ represents an integer;
the positioning principle is as follows:
the module value of the wavelet transformation represents the amplitude value used for describing the signal mutation point, when the power supply circuit breaks down, the fault transient waveform is mutated at the fault moment, so that the module value of the wavelet transformation reaches an extreme value; and detecting the fault moment by selecting a mode maximum value of wavelet transformation, and positioning the leakage phase line by the fault moment.
In one embodiment of the present application, the timing detection is performed on the isolation transformer to determine whether the isolation transformer is in an overload state, and the method specifically includes the following steps:
s51, acquiring a rated load range of the isolation transformer, and setting an overload threshold;
s52, carrying out timing detection on the isolation transformer to obtain a real-time load value;
and S53, judging the magnitude of the real-time load value and the overload threshold value, and cutting off the closed loop if the real-time load value is larger than or equal to the overload threshold value.
In summary, the application has the following beneficial effects:
(1) According to the application, the power supply line is divided into a plurality of detection nodes, the detection nodes are subjected to comprehensive sectional detection of multiple factors including voltage, current and potential, the generated leakage signal is tracked and positioned to determine the leakage position, and finally, the switching and control of the power supply line are realized through the control switch and the isolation transformer, so that the stable operation of the power supply line is ensured.
(2) The application sets the comparator in the voltage detection to compare the sampled voltage with the reference voltage, can rapidly and accurately compare the signal size and generate corresponding output, thereby improving the real-time performance and accuracy of the power supply line control.
(3) The zero sequence current transformer for inducing the leakage fault is sleeved on the power supply line, and when the current is larger than the current threshold value, a current action signal for controlling the switch to perform line control can be output; the zero-sequence current can be accurately and rapidly detected and measured through the zero-sequence current transformer, so that the protection and detection of the ground fault are realized, and the safety, stability and reliability of the power supply network are improved.
(4) The application sets zero-phase current transformer on the power supply line, which makes the alternating current circuit of the power supply line pass through the zero-phase current transformer, and obtains the leakage signal according to the zero-phase current transformer and the voltage detection result; by utilizing the advantages of the zero-phase current transformer, such as accurate measurement characteristic, low phase difference, wide frequency range, linear output and the like, the accurate measurement of alternating current in a power supply circuit is realized, and corresponding circuit protection and control are realized.
(5) The application adopts a wavelet positioning method based on a mode maximum value to position the leakage phase line, and the mode value representation of wavelet transformation can accurately describe the amplitude value of a signal mutation point; when the power supply line fails, the fault transient waveform can be suddenly changed at the time of the fault, so that the modulus value of the wavelet transformation can reach an extreme value. Therefore, by selecting the modulus maximum of the wavelet transform, the failure moment can be detected. The method has the advantages of high precision, multi-scale analysis, adaptability, real-time performance, high efficiency, noise immunity and the like, so that the method can be used for rapidly and accurately positioning the electric leakage position in the power supply line.
(6) According to the application, the phase line with electric leakage is connected with the zero line by adopting the isolation transformer with the coil ratio of 1:1, and the voltage which is the same as the power supply voltage is provided for subsequent electric equipment by the isolation transformer, so that the subsequent electric equipment can stably operate; and the isolation transformer provides safe, reliable and stable guarantee for the power supply and the electric equipment through the functions of electric isolation, voltage reduction/boosting, voltage regulation and the like.
(7) The application also sets timing detection for the isolation transformer to prevent performance degradation caused by excessive use, thereby influencing the use of electric equipment and endangering surrounding people; the application also provides a leakage alarm device which is used for sending out audible and visual alarm information and prompting an maintainer to timely maintain the leakage phase line, thereby ensuring the safety of the power supply line and the timeliness of leakage treatment.
Example 2
Referring to fig. 2, an embodiment of the present application provides a power supply line control system, including: the device comprises a node dividing module, a voltage detection module, a current detection module, a potential detection module, a leakage positioning module and a line control module;
the node dividing module and the line control module are respectively in communication connection with the voltage detection module, the current detection module and the potential detection module;
the node dividing module is used for dividing the power supply line into a plurality of detection nodes;
the voltage detection module is used for detecting the voltage in the detection node and obtaining a voltage detection result;
the current detection module is used for detecting the current in the detection node and obtaining a current detection result;
the potential detection module is used for detecting the potentials of two adjacent nodes in the detection nodes to obtain potential detection results;
the electric leakage positioning module is used for generating an electric leakage signal according to the voltage detection result, the current detection result and the potential detection result; determining the node position of the power supply line where the leakage condition occurs by tracking the leakage signal, and positioning a leakage phase line;
the circuit control module is used for amplifying the leakage signal to obtain an amplified signal; and controlling a control switch in the power supply line to perform line control according to the amplified signal.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional modules is illustrated, and in practical application, the above-described functional allocation may be performed by different functional modules according to needs, i.e. the internal structure of the system is divided into different functional modules to perform all or part of the functions described above. The functional modules in the embodiment may be integrated in one processing module, or each module may exist alone physically, or two or more modules may be integrated in one module, where the integrated modules may be implemented in a form of hardware or a form of software functional modules. In addition, the specific names of the functional modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
The present application is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present application.
Claims (10)
1. A power supply line control method is characterized in that: the method comprises the following steps:
node division is carried out on the power supply line;
detecting the voltage, current and potential of each node to obtain a detection result;
judging the position of a node where electric leakage occurs according to the detection result;
line control is carried out according to the node position, and a leakage phase line is communicated with a zero line through an isolation transformer to form a closed loop;
the coil ratio in the isolation transformer is 1:1;
wherein the line control includes one or more of communicating the leaky phase line with the neutral line via the isolation transformer, cutting off the leaky phase line, switching non-leaky phase line to communicate with the neutral line, and communicating a leaky alarm device;
the electric leakage alarm device is used for sending out audible and visual alarm information and prompting maintenance personnel to carry out line maintenance.
2. A power supply line control method according to claim 1, characterized in that: the power supply circuit is controlled, and the method specifically further comprises the following steps:
dividing the power supply line into a plurality of detection nodes;
detecting the voltage in the detection node to obtain a voltage detection result;
detecting the current in the detection node to obtain a current detection result;
detecting the potential of two adjacent nodes in the detection nodes to obtain a potential detection result;
analyzing and processing the voltage detection result, the current detection result and the potential detection result to obtain a leakage signal;
tracking the leakage signal, judging the node position of the power supply line where the leakage condition occurs according to the leakage signal, and positioning a leakage phase line;
amplifying the leakage signal to obtain an amplified signal;
and controlling a control switch in the power supply line to perform line control according to the amplified signal.
3. A power supply line control method according to claim 2, characterized in that: the detecting the voltage in the detection node specifically includes the following steps:
sampling the output voltage of the detection node according to a proportion to obtain a sampling voltage;
acquiring historical voltage data of the power supply line, and generating a reference voltage;
judging the magnitudes of the sampling voltage and the reference voltage through a comparator, and outputting the voltage detection result and a voltage action signal if the sampling voltage is lower than the reference voltage;
the positive electrode input end of the comparator is connected with the sampling voltage, and the negative electrode input end of the comparator is connected with the reference voltage;
the voltage action signal is used for controlling the control switch to conduct line control.
4. A power supply line control method according to claim 2, characterized in that: the detecting the current in the detection node specifically comprises the following steps:
collecting historical current data in the power supply line, and obtaining a current threshold I t ；
Collecting real-time current data in the detection node to obtain the current I A ；
Threshold the current I t And the current I A Comparing if the current I A Greater than the current threshold I t And outputting the current detection result.
5. The power supply line control method according to claim 4, characterized in that: the power supply line is sleeved with zero sequence current mutual for inducing leakage faultsA sensor for detecting the current I A Greater than the current threshold I t Outputting a current action signal; the current action signal is used for controlling the control switch to conduct line control.
6. A power supply line control method according to claim 2, characterized in that: the detecting the potential of two adjacent nodes in the detecting nodes specifically comprises the following steps:
collecting historical potential data of the detection node, and generating a potential threshold value;
collecting real-time potential data of the detection node to generate a current potential;
acquiring the real-time potential data of two adjacent detection nodes to generate a real-time potential difference;
acquiring the historical potential data of two adjacent detection nodes, and generating a potential difference threshold;
comparing the current potential with the potential threshold, and outputting the potential detection result if the current potential is smaller than the potential threshold;
comparing the time potential difference with the potential difference threshold, and outputting a potential action signal if the time potential difference is smaller than the potential difference threshold; the potential action signal is used for controlling the control switch to conduct line control.
7. A power supply line control method according to claim 3, characterized in that: a zero-phase current transformer is arranged on the power supply line, so that an alternating current circuit of the power supply line penetrates through the zero-phase current transformer; the leakage signal is obtained according to the zero-phase current transformer and the voltage detection result, and the method specifically comprises the following steps:
detecting the voltage waveform output by the zero-phase current transformer;
acquiring turning points of the voltage waveform and counting the number of the turning points;
outputting a waveform action signal if the number of turning points reaches a specified number;
and generating the leakage signal according to the waveform action signal and the voltage action signal.
8. A power supply line control method according to claim 2, characterized in that: and positioning the leakage phase line by adopting a wavelet positioning method based on a mode maximum value, wherein the adopted formula is as follows:
；
wherein,wavelet transformation representing a traveling wave; />Representing a transient signal;
representing a wavelet function; t represents the moment;
s represents a scale factor, whereinZ represents an integer.
9. A power supply line control method according to claim 1, characterized in that: the method comprises the following steps of detecting the isolation transformer at fixed time and judging whether the isolation transformer is in an overload state or not:
acquiring a rated load range of the isolation transformer, and setting an overload threshold;
performing timing detection on the isolation transformer to obtain a real-time load value;
and judging the magnitude of the real-time load value and the overload threshold, and if the real-time load value is larger than or equal to the overload threshold, cutting off the closed loop.
10. A power line control system, characterized in that: the device comprises a node dividing module, a voltage detection module, a current detection module, a potential detection module, a leakage positioning module and a line control module;
the node dividing module and the line control module are respectively in communication connection with the voltage detection module, the current detection module and the potential detection module;
the node dividing module is used for dividing the power supply line into a plurality of detection nodes;
the voltage detection module is used for detecting the voltage in the detection node and obtaining a voltage detection result;
the current detection module is used for detecting the current in the detection node and obtaining a current detection result;
the potential detection module is used for detecting the potentials of two adjacent nodes in the detection nodes to obtain potential detection results;
the electric leakage positioning module is used for generating an electric leakage signal according to the voltage detection result, the current detection result and the potential detection result; determining the node position of the power supply line where the leakage condition occurs by tracking the leakage signal, and positioning a leakage phase line;
the circuit control module is used for amplifying the leakage signal to obtain an amplified signal; and controlling a control switch in the power supply line to perform line control according to the amplified signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117387603A (en) * | 2023-12-13 | 2024-01-12 | 西安新视空间信息科技有限公司 | Power inspection map navigation method and device, medium and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117387603A (en) * | 2023-12-13 | 2024-01-12 | 西安新视空间信息科技有限公司 | Power inspection map navigation method and device, medium and electronic equipment |
| CN117387603B (en) * | 2023-12-13 | 2024-02-23 | 西安新视空间信息科技有限公司 | Power inspection map navigation method and device, medium and electronic equipment |
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