CN111060847A - Low-voltage wire leakage position detection system and method - Google Patents
Low-voltage wire leakage position detection system and method Download PDFInfo
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- CN111060847A CN111060847A CN201911369970.8A CN201911369970A CN111060847A CN 111060847 A CN111060847 A CN 111060847A CN 201911369970 A CN201911369970 A CN 201911369970A CN 111060847 A CN111060847 A CN 111060847A
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Abstract
The invention provides a low-voltage wire leakage position detection system, which comprises 4 current transformers, a processor and a display module, wherein the current transformers are used for respectively acquiring current data of a three-phase four-wire, the processor is used for carrying out operation and logic judgment processing on the acquired current data, and the display module is used for displaying a judgment result, and a fault threshold value is preset in the processor; the 4 current transformers are respectively connected with the three-phase four-wire lead, the output ends of the current transformers are connected with the input end of the processor, and the output end of the processor is connected with the input end of the display module. The invention also provides a low-voltage wire leakage position detection method which is applied to the low-voltage wire leakage position detection system. The invention adopts the processor to detect whether the three-phase load power of the three-phase four-wire conductor is balanced or not, combines the position adjustable detection of 4 current transformers, and can effectively detect the position of the leakage or ground fault in the conductor through the fault threshold value preset by the processor, thereby effectively improving the detection operation efficiency.
Description
Technical Field
The invention relates to the technical field of power equipment detection, in particular to a system and a method for detecting a low-voltage wire leakage position.
Background
When the leakage occurs to the 0.4kV low-voltage lead, operation and maintenance personnel of the line need to clamp the A-phase, B-phase, C-phase and N-phase four leads simultaneously through the clamp ammeter, the reading of the clamp ammeter is the sum of the current vectors of the four leads, when the sum of the current vectors is not zero, the leakage fault exists at the rear end of the measuring point, and when the sum of the current vectors is zero, the rear end of the measuring point is proved to have no fault, so that the detection of the leakage position of the low-voltage lead is realized.
However, when the line diameter of the three-phase four-wire low-voltage line at the measuring position is large, the existing clamp ammeter cannot clamp four wires simultaneously for measurement, and in the measuring process, the street code carrying the line needs to be temporarily removed to further detect the wires, so that the problems of low operating efficiency, large workload and certain operation safety risk exist.
Disclosure of Invention
The invention provides a low-voltage wire leakage position detection system and a low-voltage wire leakage position detection method, aiming at overcoming the defects that the clamp-on ammeter in the prior art cannot clamp four wires for measurement at the same time and has low leakage detection efficiency.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a low-voltage wire leakage position detection system comprises 4 current transformers for respectively acquiring current data of a three-phase four-wire, a processor for performing operation and logic judgment processing on the acquired current data, and a display module for displaying a judgment result, wherein a fault threshold value is preset in the processor; the 4 current transformers are respectively connected with the three-phase four-wire lead, the output ends of the current transformers are connected with the input end of the processor, and the output end of the processor is connected with the input end of the display module.
In the technical scheme, 4 current transformers respectively acquire current data of a three-phase four-wire lead and transmit the current data into a processor, and the processor performs summation operation on the acquired current data to obtain a three-phase load current vector sum; the processor judges the vector sum of the three-phase load current: if the vector sum of the three-phase load currents is zero, outputting a judgment result that the three-phase load currents are balanced, and transmitting the judgment result to a display module for displaying; if the sum of the three-phase load current vectors is not zero, outputting a judgment result that the electric leakage exists in the lead, indicating that the electric leakage or the grounding fault exists behind the current measuring point by adjusting the collecting position of the current transformer until the sum of the three-phase load current vectors is larger than a fault threshold value, and then transmitting the judgment result to a display module for displaying.
Preferably, the current transformer comprises a measurement-grade open current transformer.
Preferably, the system further comprises a communication module, an input of which is connected to an output of the processor.
Preferably, the communication module comprises one or more of a 4G module, a GPS module, a WiFi module, and a GSM module.
Preferably, the system further comprises an alarm module, and the input end of the alarm module is connected with the output end of the processor.
Preferably, the alarm module comprises one or more of a buzzer, a warning lamp and an audible and visual alarm.
Preferably, the display module includes a liquid crystal display.
The invention also provides a low-voltage wire electric leakage position detection method, which is applied to the low-voltage wire electric leakage position detection system and comprises the following steps:
s1: respectively acquiring current data of the three-phase four-wire lead by adopting 4 current transformers, and transmitting the current data into a processor;
s2: the processor performs addition operation on the acquired current data to obtain a three-phase load current vector sum;
s3: the processor judges the vector sum of the three-phase load current: if the sum of the three-phase load current vectors is zero, outputting a judgment result that the three-phase load current is balanced, and then jumping to execute the step S5; if the sum of the three-phase load current vectors is not zero, outputting a judgment result that the electric leakage exists in the lead, and then executing the step S4;
s4: the processor judges whether the sum of the three-phase load current vectors is greater than a preset fault threshold value, if so, the processor indicates that electric leakage or ground fault exists behind the current measuring point, and the step S5 is executed; if not, adjusting the acquisition positions of the 4 current transformers until the sum of the three-phase load current vectors is greater than a fault threshold value, and then executing the step S5;
s5: the processor transmits the current data and the judgment result to the display module for displaying.
Preferably, the S4 step further includes the steps of: if the processor judges that the sum of the three-phase load current vectors is larger than the fault threshold value, the processor sends an alarm signal to a communication module connected with the processor, and the communication module sends the alarm signal to a control server or a terminal of operation and maintenance personnel according to a preset communication address.
Preferably, the S4 step further includes the steps of: if the processor judges that the sum of the three-phase load current vectors is larger than the fault threshold value, the processor sends an electric signal to an alarm module connected with the processor, and the alarm module is conducted and sends an alarm signal.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that: the 4 current transformers are adopted to respectively collect current data of the three-phase four-wire lead to replace the existing pincerlike ammeter, the street codes are not required to be dismantled, and the current data of the lead can be directly collected, so that the detection operation efficiency of the electric leakage or the ground fault of the lead is effectively improved; whether the three-phase load power of the three-phase four-wire conductor is balanced or not is detected by the processor, the position of the leakage or the ground fault in the conductor can be effectively detected by combining the position adjustable detection of the 4 current transformers and the fault threshold value preset by the processor.
Drawings
Fig. 1 is a schematic structural diagram of a low-voltage wire leakage position detection system according to embodiment 1.
Fig. 2 is an installation schematic diagram of the current transformer of embodiment 2.
Fig. 3 is a flowchart of a low-voltage wire leakage position detection method according to embodiment 2.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
The present embodiment provides a system for detecting a leakage position of a low-voltage wire, as shown in fig. 1, which is a schematic structural diagram of the system for detecting a leakage position of a low-voltage wire of the present embodiment.
The system for detecting the leakage position of the low-voltage conductor comprises 4 current transformers 1, a processor 2, a display module 3, a communication module 4 and an alarm module 5, wherein a fault threshold value is preset in the processor 3; 4 current transformer are connected with three-phase four-wire conductor respectively, and the output of current transformer 1 is connected with the input of treater 2, and the output of treater 2 is connected with display module 3's input, communication module 4's input, alarm module 5's input respectively.
Fig. 2 is a schematic diagram showing the installation of the current transformer of the present embodiment.
In this embodiment, the current transformer 1 is a measurement-level open current transformer.
In this embodiment, the display module 3 is a liquid crystal display; the communication module 4 adopts a GSM module; the alarm module 5 adopts an audible and visual alarm.
In the specific implementation process, the 4 current transformers 1 respectively acquire current data of the three-phase four-wire lead and transmit the current data into the processor 2, and the processor 2 performs addition operation on the acquired current data to obtain a three-phase load current vector sum; the processor 2 judges the vector sum of the three-phase load currents: if the sum of the three-phase load current vectors is zero, outputting a judgment result that the three-phase load current is balanced, and transmitting the judgment result to the display module 3 for displaying; if the sum of the three-phase load current vectors is not zero, the judgment result is output to indicate that the electric leakage exists in the wire, at the moment, the operation and maintenance personnel adjust the collection position of the current transformer 1 to the processor 2 to judge that the sum of the current three-phase load current vectors is larger than the fault threshold value, the fact that the electric leakage or the ground fault exists behind the measurement point of the current transformer 1 is indicated, the processor 2 transmits the judgment result and the collected current data to the display module 3 to be displayed, and meanwhile, the judgment result and the collected current data are uploaded to a control server or a terminal of the operation and maintenance personnel through the communication module 4. In addition, the processor 2 sends an electric signal to the alarm module 5 to enable the alarm module to be conducted, and the alarm module 5 works and warns operation and maintenance personnel.
In this embodiment, the default threshold value preset in the processor 2 is 1A.
In this embodiment, the current transformer 1 is used for respectively collecting current data of a three-phase four-wire conductor, the processor 2 is used for performing operation and logic judgment processing on the collected current data, the display module 3 is used for displaying a judgment result and current data information, the communication module 4 is used for uploading the judgment result and the current data information to a management and control server or an operation and maintenance personnel terminal, and the alarm module 5 is used for sending out a conductor leakage alarm. When the processor judges that the current three-phase load power is unbalanced, the position of the current transformer is adjusted until the processor judges that the sum of the current vectors of the current three-phase load is greater than a preset fault threshold value, and the current transformer rear position is the position of low-voltage wire leakage or ground fault, so that the position detection of the wire leakage or ground fault is realized. In addition, this embodiment adopts 4 current transformer to carry out current data acquisition to three-phase four-wire respectively, need not demolish the street sign indicating number, can effectively improve wire electric leakage or earth fault's detection operating efficiency.
Example 2
The present embodiment provides a method for detecting a leakage position of a low-voltage wire, as shown in fig. 3, which is a flowchart of the method for detecting a leakage position of a low-voltage wire according to the present embodiment.
The method for detecting the leakage position of the low-voltage wire provided by the embodiment is applied to the system for detecting the leakage position of the low-voltage wire provided by the embodiment 1, and specifically comprises the following steps:
s1: the method comprises the following steps that 4 current transformers 1 are adopted to respectively acquire current data of a three-phase four-wire lead and transmit the current data into a processor 2;
s2: the processor 2 performs addition operation on the acquired current data to obtain a three-phase load current vector sum;
s3: the processor 2 judges the vector sum of the three-phase load currents: if the sum of the three-phase load current vectors is zero, outputting a judgment result that the three-phase load current is balanced, and then jumping to execute the step S5; if the sum of the three-phase load current vectors is not zero, outputting a judgment result that the electric leakage exists in the lead, and then executing the step S4;
s4: the processor 2 judges whether the sum of the three-phase load current vectors is greater than a preset fault threshold value, if so, the processor indicates that an electric leakage or ground fault exists behind the current measuring point, and executes the step S5; if not, adjusting the acquisition positions of the 4 current transformers 1 until the sum of the three-phase load current vectors is greater than the fault threshold value, and then executing the step S5;
s5: the processor 2 transmits the current data and the judgment result to the display module 3 for displaying.
In this embodiment, if the processor 2 determines that the sum of the three-phase load current vectors is greater than the fault threshold, the processor 2 sends an alarm signal to the communication module 4 connected to the processor, and the communication module 4 sends the alarm signal to the management and control server or the terminal of the operation and maintenance staff according to the preset communication address.
In this embodiment, if the processor 2 determines that the sum of the three-phase load current vectors is greater than the fault threshold, the processor 2 sends an electrical signal to the alarm module 5 connected thereto, and the alarm module is turned on and sends an alarm signal.
In this embodiment, the default threshold value preset in the processor 2 is 1A.
In this embodiment, current transformer 1 is used for gathering the current data of three-phase four-wire respectively, and processor 2 is used for calculating and logic judgment processing to the current data of gathering, and display module 3 is used for showing judgement result and current data information, and communication module 4 is used for uploading judgement result and current data information to management and control server or operation and maintenance personnel terminal, and alarm module 5 is used for sending the wire electric leakage warning and warns operation and maintenance personnel wire and has electric leakage or ground fault.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A low-voltage wire leakage position detection system is characterized by comprising 4 current transformers for respectively acquiring current data of a three-phase four-wire, a processor for performing operation and logic judgment processing on the acquired current data, and a display module for displaying a judgment result, wherein a fault threshold value is preset in the processor; the 4 current transformers are respectively connected with a three-phase four-wire lead, the output ends of the current transformers are connected with the input end of the processor, and the output end of the processor is connected with the input end of the display module;
the 4 current transformers respectively acquire current data of the three-phase four-wire lead and transmit the current data into the processor, and the processor performs summation operation on the acquired current data to obtain a three-phase load current vector sum; the processor judges the vector sum of the three-phase load currents: if the vector sum of the three-phase load currents is zero, outputting a judgment result that the three-phase load currents are balanced, and transmitting the judgment result to a display module for displaying; if the sum of the three-phase load current vectors is not zero, outputting a judgment result that the electric leakage exists in the wire, indicating that the electric leakage or the grounding fault exists behind the current measuring point by adjusting the collecting position of the current transformer to the condition that the sum of the three-phase load current vectors is larger than a fault threshold value, and then transmitting the judgment result to a display module for displaying.
2. The low voltage wire leakage position detection system of claim 1, wherein: the current transformer comprises a measurement-grade open current transformer.
3. The low voltage wire leakage position detection system of claim 1, wherein: the system further comprises a communication module, wherein the input end of the communication module is connected with the output end of the processor.
4. The low voltage wire leakage position detection system of claim 3, wherein: the communication module comprises one or more of a 4G module, a GPS module, a WiFi module and a GSM module.
5. The low voltage wire leakage position detection system of claim 1, wherein: the system also comprises an alarm module, wherein the input end of the alarm module is connected with the output end of the processor.
6. The low voltage wire leakage position detection system of claim 5, wherein: the alarm module comprises one or more of a buzzer, a warning lamp and an audible and visual alarm.
7. The low voltage wire leakage position detection system of claim 1, wherein: the display module comprises a liquid crystal display screen.
8. A low-voltage wire leakage position detection method is applied to the low-voltage wire leakage position detection system of any one of claims 1 to 7, and is characterized by comprising the following steps:
s1: respectively acquiring current data of the three-phase four-wire lead by adopting 4 current transformers, and transmitting the current data into a processor;
s2: the processor performs addition operation on the acquired current data to obtain a three-phase load current vector sum;
s3: the processor judges the vector sum of the three-phase load currents: if the sum of the three-phase load current vectors is zero, outputting a judgment result that the three-phase load current is balanced, and then jumping to execute the step S5; if the sum of the three-phase load current vectors is not zero, outputting a judgment result that the electric leakage exists in the lead, and then executing the step S4;
s4: the processor judges whether the sum of the three-phase load current vectors is greater than a preset fault threshold value, if so, the processor indicates that electric leakage or ground fault exists behind the current measuring point, and the step S5 is executed; if not, adjusting the acquisition positions of the 4 current transformers until the sum of the three-phase load current vectors is greater than a fault threshold value, and then executing the step S5;
s5: and the processor transmits the current data and the judgment result to a display module for displaying.
9. The low-voltage wire leakage position detection method according to claim 8, characterized in that: the step of S4 further includes the steps of: and if the processor judges that the sum of the three-phase load current vectors is greater than the fault threshold value, the processor sends an alarm signal to a communication module connected with the processor, and the communication module sends the alarm signal to a control server or a terminal of an operation and maintenance worker according to a preset communication address.
10. The low-voltage wire leakage position detection method according to claim 8, characterized in that: the step of S4 further includes the steps of: and if the processor judges that the sum of the three-phase load current vectors is greater than the fault threshold value, the processor sends an electric signal to an alarm module connected with the processor, and the alarm module is switched on and sends an alarm signal.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111580010A (en) * | 2020-05-29 | 2020-08-25 | 广东电网有限责任公司 | 0.4kV electric leakage measuring method |
| CN112505584A (en) * | 2020-11-27 | 2021-03-16 | 重庆龙煜精密铜管有限公司 | Grounding leakage fault point positioning system for heating pipe of annealing furnace |
| CN113391168A (en) * | 2021-07-23 | 2021-09-14 | 广东电网有限责任公司 | Low-voltage line electricity stealing and leakage detection device and detection method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580010A (en) * | 2020-05-29 | 2020-08-25 | 广东电网有限责任公司 | 0.4kV electric leakage measuring method |
| CN112505584A (en) * | 2020-11-27 | 2021-03-16 | 重庆龙煜精密铜管有限公司 | Grounding leakage fault point positioning system for heating pipe of annealing furnace |
| CN112505584B (en) * | 2020-11-27 | 2024-01-12 | 重庆龙煜精密铜管有限公司 | Positioning system for earth leakage fault point of heating tube of annealing furnace |
| CN113391168A (en) * | 2021-07-23 | 2021-09-14 | 广东电网有限责任公司 | Low-voltage line electricity stealing and leakage detection device and detection method thereof |
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Application publication date: 20200424 |