CN114113915B - Low-voltage transformer area electric leakage detection method, system, equipment and storage medium - Google Patents
Low-voltage transformer area electric leakage detection method, system, equipment and storage medium Download PDFInfo
- Publication number
- CN114113915B CN114113915B CN202111503530.4A CN202111503530A CN114113915B CN 114113915 B CN114113915 B CN 114113915B CN 202111503530 A CN202111503530 A CN 202111503530A CN 114113915 B CN114113915 B CN 114113915B
- Authority
- CN
- China
- Prior art keywords
- residual current
- low
- transformer area
- voltage transformer
- early warning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention provides a low-voltage transformer area electric leakage detection method, a system, equipment and a storage medium, and belongs to the technical field of power distribution networks. The method comprises the steps of collecting residual current at a low-voltage user side, comparing the residual current with a set limit value, if the residual current exceeds the set value, considering that an electric leakage condition needs to be alarmed, if the residual current does not exceed the set limit value, drawing a 96-point curve data graph related to the residual current, and further carrying out risk early warning related to the electric leakage according to the graph. The detection method provided by the invention judges the leakage condition through the residual current, a worker can realize real-time detection of the leakage condition only by installing the collector for collecting the residual current once at the low-voltage user side, and the risk early warning can be further carried out according to the existing data, so that the early warning capability of the leakage condition of the low-voltage transformer area is improved.
Description
Technical Field
The invention belongs to the technical field of power distribution networks, and particularly relates to a low-voltage transformer area electric leakage detection method, a system, equipment and a storage medium.
Background
With the advancement of modern construction pace of China, the electric power industry is continuously developed and the low-voltage power distribution and leakage protection system plays an increasingly important role. However, in practical application, because the low-voltage distribution transformer area has more users and complex circuits in the area governed by the low-voltage distribution transformer area, and part of transformer area equipment and circuits have long service life and are not maintained and overhauled timely, the low-voltage leakage fault of the circuit equipment is caused. The faults not only can cause electric quantity loss and waste of the power grid, but also endanger the electricity safety of people in the area.
For detecting low-voltage leakage faults, the existing method is to read the current of a low-voltage transformer area lead by using a clamp digital display ammeter, and determine the current leakage condition of the low-voltage transformer area by combining the current. The method generally requires a plurality of groups of personnel to measure a plurality of wires simultaneously, is inconvenient to operate and high in workload, and cannot realize real-time detection of leakage faults.
Disclosure of Invention
In view of the above, the invention aims to solve the problems that the existing leakage detection method is inconvenient to operate, has large workload and cannot detect the leakage fault in real time.
In order to solve the technical problems, the invention provides the following technical scheme:
a low-voltage transformer area leakage detection method comprises the following steps:
collecting residual current of a low-voltage user side on each line;
judging whether the residual current of each line is larger than a set limit value or not respectively, if so, locating a fault and giving an alarm, and if not, continuing the subsequent steps;
and drawing a 96-point curve data graph based on the residual current, and performing risk early warning according to the 96-point curve data graph.
Further, the collection of the residual current of the low-voltage user side on each line is specifically as follows:
and arranging collectors on the low-voltage user side of each line, and collecting residual current in real time by using the collectors.
Further, the drawing of the 96-point curve data graph based on the residual current is specifically as follows:
the average value of the residual current is obtained every 15 minutes in one day, 96 residual current average values are obtained for each line, and a 96-point curve data graph is drawn based on the 96 residual current average values.
Further, the risk early warning according to the 96-point curve data graph is specifically as follows:
obtaining abrupt change points of curves in a 96-point curve data graph;
judging whether the residual current value corresponding to the abrupt change point is larger than a set limit value, if not, pre-judging the abrupt change point as a fault point and performing risk early warning.
In a second aspect, the present invention provides a low-voltage transformer area leakage detection system, including:
the acquisition unit is used for acquiring the residual current of the low-voltage user side on each line;
the alarm unit is used for judging whether the residual current of each line is larger than a set limit value or not respectively, if so, locating faults and giving an alarm, and if not, continuing the following steps;
and the early warning unit is used for drawing a 96-point curve data diagram based on the residual current and carrying out risk early warning according to the 96-point curve data diagram.
In a third aspect, the present invention provides a low voltage transformer area leakage detection apparatus, the apparatus comprising a processor and a memory:
the memory is used for storing the computer program and sending the instructions of the computer program to the processor;
the processor executes a low-voltage transformer area leakage detection method according to the first aspect according to instructions of a computer program.
In a fourth aspect, the present invention provides a computer storage medium having a computer program stored thereon, which when executed by a processor implements a low voltage transformer area leakage detection method as in the first aspect.
In summary, the invention provides a low-voltage transformer area leakage detection method, a system, a device and a storage medium, wherein the method comprises the steps of collecting residual current at a low-voltage user side, comparing the residual current with a set limit value, if the residual current exceeds the set value, warning is considered to be needed when the leakage condition occurs, if the residual current does not exceed the set limit value, a 96-point curve data graph related to the residual current is drawn, and further risk early warning related to the leakage is carried out according to the graph. The detection method provided by the invention judges the leakage condition through the residual current, a worker can realize real-time detection of the leakage condition only by installing the collector for collecting the residual current once at the low-voltage user side, and the risk early warning can be further carried out according to the existing data, so that the early warning capability of the leakage condition of the low-voltage transformer area is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic flow chart of a low-voltage transformer area leakage detection method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a low-voltage transformer area leakage detection system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
With the advancement of modern construction pace of China, the electric power industry is continuously developed and the low-voltage power distribution and leakage protection system plays an increasingly important role. However, in practical application, because the low-voltage distribution transformer area has more users and complex circuits in the area governed by the low-voltage distribution transformer area, and part of transformer area equipment and circuits have long service life and are not maintained and overhauled timely, the low-voltage leakage fault of the circuit equipment is caused. The faults not only can cause electric quantity loss and waste of the power grid, but also endanger the electricity safety of people in the area.
For detecting low-voltage leakage faults, the existing method is to read the current of a low-voltage transformer area lead by using a clamp digital display ammeter, and determine the current leakage condition of the low-voltage transformer area by combining the current. The method generally requires a plurality of groups of personnel to measure a plurality of wires simultaneously, is inconvenient to operate and high in workload, and cannot realize real-time detection of leakage faults.
Based on the detection, the invention provides a low-voltage transformer area leakage detection method, a system, equipment and a storage medium.
The following is a detailed description of an embodiment of a low voltage transformer area leakage detection method according to the present invention.
Referring to fig. 1, the embodiment provides a low-voltage transformer area leakage detection method, which includes the following steps:
s100: and collecting residual current at the low-voltage user side on each line.
The residual current refers to the vector sum of the currents of the phases (including the neutral line) in the low-voltage distribution line, which is not zero. In popular terms, when an accident occurs on the electricity utilization side, current flows from the electrified body to the ground through the human body, so that the current in the incoming and outgoing lines of the main circuit is unequal in magnitude, and the instantaneous vector synthesis effective value of the current is called residual current and commonly called electric leakage.
The residual current detection principle is as follows: assuming ia, ib, ic as phase currents, in as neutral line current, id as residual current of the phase line to ground at point a, and s as any closed surface. According to kirchhoff's law, if the sum of the phasors of the effective values of the currents flowing into any of the closed surfaces s is equal to zero, there is an arrangement of ia+ib+ic-in-id=0 to obtain ia+ib+ic-in=id. Under normal conditions, the vector sum of the three-phase currents is equal to the current flowing through the n lines, and the directions of the vector sum are opposite to each other and cancel each other. If the line insulation deteriorates or other causes the a-phase line to generate a current to ground at point a, the induction coil will induce a current proportional to the magnitude of the residual current id, the magnitude of which reflects the leakage of current in the distribution line and electrical equipment.
Therefore, based on the above detection principle, in this embodiment, by arranging collectors on the low-voltage user side on each line, the residual current is collected in real time by using the collectors.
The specific collector can adopt a residual current transformer, and the residual current transformer is distributed in a place convenient to overhaul and is far away from the magnetic field as much as possible. The residual current transformer should separate the phase line, N line and PE line in the power grid before threading. The phase and N wires must pass through the residual current transformer together and the PE wire cannot pass through the transformer. In the system, if the N line does not pass through the mutual inductor together with the phase line, once the three-phase load is unbalanced, current flows through the N line, and the detector detects a current signal, namely misoperation occurs. N lines between different loops are not connected in multiple points or are repeatedly grounded, otherwise, misoperation is caused.
S200: and judging whether the residual current of each line is larger than a set limit value or not respectively. If yes, step S201 is executed, and if no, step S202 is executed.
In addition, a critical point value (generally, mA level) is manually set in the actual monitoring process due to the influence of the measurement error and the measurement environment, and if the residual current exceeds the critical point value, the threshold is considered to be exceeded.
S201: and positioning the fault and giving out early warning.
It should be noted that the out-of-limit line is positioned as the line with electric leakage and gives an alarm, so that the timely treatment of staff can be facilitated.
S202: and drawing a 96-point curve data graph based on the residual current, and performing risk early warning according to the 96-point curve data graph.
The 96-point curve is an average of 96 parts obtained by dividing 24 hours a day into 96 parts, and the average value of the residual current in 15 minutes is stored every 15 minutes, and 96 sets of data are obtained in one day. A 96-point curve data graph is plotted from the 96 sets of data.
By analyzing the 96-point curve data, fault points and risk early warning are pre-judged, for example, the earth current generated at a position of a phase line due to line insulation degradation or other reasons is timely found out. The residual current 96-point data curve of one line should be a straight line in theory, that is, the values of the residual currents are approximately equal for each point, but through analysis of the residual currents at 96 points, if sudden, transient or indirect mutation occurs, the fault point can be predicted and fed back to risk early warning under the condition that the fault point is not reached.
The embodiment provides a low-voltage transformer area leakage detection method, which comprises the steps of collecting residual current at a low-voltage user side, comparing the residual current with a set limit value, if the residual current exceeds the set value, considering that an electric leakage condition needs to be alarmed, if the residual current does not exceed the set limit value, drawing a 96-point curve data graph related to the residual current, and further carrying out risk early warning related to the electric leakage according to the graph. The detection method provided by the invention judges the leakage condition through the residual current, a worker can realize real-time detection of the leakage condition only by installing the collector for collecting the residual current once at the low-voltage user side, and the risk early warning can be further carried out according to the existing data, so that the early warning capability of the leakage condition of the low-voltage transformer area is improved.
The foregoing is a detailed description of an embodiment of a low-voltage transformer area leakage detection method according to the present invention, and the following describes in detail an embodiment of a low-voltage transformer area leakage detection system according to the present invention.
As shown in fig. 2, the present embodiment provides a low-voltage transformer area leakage detection system, which includes: acquisition unit 100, alarm unit 200, and pre-alarm unit 300.
In this embodiment, the collection unit 100 is configured to collect the residual current on the low-voltage user side on each line.
In this embodiment, the alarm unit 200 is configured to determine whether the residual current of each line is greater than a set limit value, if yes, locate a fault and send out an alarm, and if no, continue the following steps.
In this embodiment, the early warning unit 300 is configured to draw a 96-point curve data graph based on the residual current, and perform risk early warning according to the 96-point curve data graph.
It should be noted that, the detection system provided in this embodiment is used to implement the detection method provided in the foregoing embodiment, and specific setting of each unit is based on implementing the method, which is not described herein again.
The foregoing is a detailed description of an embodiment of a low-voltage transformer area leakage detection system according to the present invention, and the following describes in detail an embodiment of a low-voltage transformer area leakage detection apparatus according to the present invention.
The embodiment provides low-voltage transformer area leakage detection equipment, which comprises a processor and a memory:
the memory is used for storing the computer program and sending the instructions of the computer program to the processor;
the processor executes a low-voltage transformer area leakage detection method according to the instructions of the computer program.
The foregoing is a detailed description of an embodiment of a low-voltage transformer area leakage detection apparatus of the present invention, and the following describes in detail an embodiment of a computer storage medium of the present invention.
The present embodiment provides a computer storage medium, on which a computer program is stored, which when executed by a processor implements a low-voltage transformer area leakage detection method as in the foregoing embodiment.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. The low-voltage transformer area leakage detection method is characterized by comprising the following steps of:
collecting residual current of a low-voltage user side on each line;
judging whether the residual current of each line is larger than a set limit value or not respectively, if so, locating a fault and giving an alarm, and if not, continuing the subsequent steps;
drawing a 96-point curve data graph based on the residual current, and performing risk early warning according to the 96-point curve data graph;
the risk early warning according to the 96-point curve data graph specifically comprises the following steps:
obtaining abrupt change points of curves in the 96-point curve data graph;
judging whether the residual current value corresponding to the abrupt change point is larger than the set limit value, if not, pre-judging the abrupt change point as a fault point and performing risk early warning.
2. The method for detecting leakage of low-voltage transformer area according to claim 1, wherein the step of collecting the residual current on the low-voltage user side on each line is specifically:
and arranging collectors on the low-voltage user side of each line, and collecting the residual current in real time by using the collectors.
3. The low-voltage transformer area leakage detection method according to claim 1, wherein the drawing of the 96-point curve data graph based on the residual current is specifically:
and obtaining the residual current average value every 15 minutes in one day, obtaining 96 residual current average values for each line, and drawing a 96-point curve data graph based on the 96 residual current average values.
4. A low voltage transformer area leakage detection system, comprising:
the acquisition unit is used for acquiring the residual current of the low-voltage user side on each line;
the alarm unit is used for judging whether the residual current of each line is larger than a set limit value or not respectively, if so, locating faults and giving an alarm, and if not, continuing the follow-up steps;
the early warning unit is used for drawing a 96-point curve data diagram based on the residual current and carrying out risk early warning according to the 96-point curve data diagram;
the early warning unit is specifically further used for:
obtaining abrupt change points of curves in the 96-point curve data graph;
judging whether the residual current value corresponding to the abrupt change point is larger than the set limit value, if not, pre-judging the abrupt change point as a fault point and performing risk early warning.
5. A low voltage transformer area leakage detection apparatus, the apparatus comprising a processor and a memory:
the memory is used for storing a computer program and sending instructions of the computer program to the processor;
the processor executes a low-voltage transformer area leakage detection method according to instructions of the computer program.
6. A computer storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements a low voltage transformer area leakage detection method according to any of claims 1-3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111503530.4A CN114113915B (en) | 2021-12-09 | 2021-12-09 | Low-voltage transformer area electric leakage detection method, system, equipment and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111503530.4A CN114113915B (en) | 2021-12-09 | 2021-12-09 | Low-voltage transformer area electric leakage detection method, system, equipment and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114113915A CN114113915A (en) | 2022-03-01 |
| CN114113915B true CN114113915B (en) | 2023-06-13 |
Family
ID=80364026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111503530.4A Active CN114113915B (en) | 2021-12-09 | 2021-12-09 | Low-voltage transformer area electric leakage detection method, system, equipment and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114113915B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116994417B (en) * | 2023-09-27 | 2024-01-23 | 广东电网有限责任公司云浮供电局 | Near electricity alarm method and system based on wearable near electricity alarm device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111665401A (en) * | 2020-06-13 | 2020-09-15 | 义乌市德义物联网科技有限公司 | Assembled low-voltage Internet of things intelligent monitoring system |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202948040U (en) * | 2012-08-23 | 2013-05-22 | 王金泽 | Intelligent electric energy meter having power failure monitoring and protection functions |
| CN107703416A (en) * | 2017-08-29 | 2018-02-16 | 珠海许继电气有限公司 | Small current neutral grounding system Secondary cases singlephase earth fault Section Location and system |
| CN207336674U (en) * | 2017-09-11 | 2018-05-08 | 湖南一二三智能科技有限公司 | One kind electric leakage monitoring system |
| CN108226623B (en) * | 2017-12-29 | 2020-06-30 | 国网浙江省电力公司湖州供电公司 | Residual current dynamic tracking analysis recording curve triggering short message system and method |
| US10761129B2 (en) * | 2018-04-03 | 2020-09-01 | Shimi Nakash | Electrical power supply panel with increased safety through monitoring and control |
| CN210225061U (en) * | 2019-05-20 | 2020-03-31 | 国网河南省电力公司漯河供电公司 | Low-voltage electric leakage online checking system |
| CN110880225B (en) * | 2019-10-29 | 2022-04-26 | 中铁第四勘察设计院集团有限公司 | Residual current type electric fire intelligent monitoring analysis method and device |
| CN110988592A (en) * | 2019-11-27 | 2020-04-10 | 云南电力技术有限责任公司 | Electric leakage safety monitoring device and method |
| CN111398740A (en) * | 2020-04-29 | 2020-07-10 | 国网湖南省电力有限公司 | Low-voltage power distribution network electricity stealing leakage detection device, monitoring system and monitoring method |
| CN112305458B (en) * | 2020-12-30 | 2021-04-16 | 南京斯泰恩智慧能源技术有限公司 | Wave recording type platform area residual current detection terminal and early warning system |
-
2021
- 2021-12-09 CN CN202111503530.4A patent/CN114113915B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111665401A (en) * | 2020-06-13 | 2020-09-15 | 义乌市德义物联网科技有限公司 | Assembled low-voltage Internet of things intelligent monitoring system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114113915A (en) | 2022-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109254226B (en) | System and method for detecting long-distance interphase grounding short circuit fault | |
| AU2012203278B2 (en) | Directional detection of a resistive earth fault and of breaking of a medium-voltage conductor | |
| CN109655713B (en) | Single-phase earth fault positioning method and system | |
| CN106501668B (en) | A kind of conventional electrical distribution net single-phase wire break fault-line selecting method | |
| CN108649532B (en) | Injection type transformer line open-phase protection method and device | |
| CN103606909A (en) | Protecting system and method for power distribution network circuit | |
| US11977105B2 (en) | Current and voltage measuring unit | |
| CN114113915B (en) | Low-voltage transformer area electric leakage detection method, system, equipment and storage medium | |
| CN103777077A (en) | Wireless pincerlike phase detection device | |
| CN104215867A (en) | Online recognition method for single-phase ground faults of low-voltage side of exciting transformer | |
| Tajani et al. | A novel differential protection scheme for AC microgrids based on discrete wavelet transform | |
| CN103823160A (en) | Self-adaption ground fault line selection method and device for power distribution network | |
| CN107797023B (en) | Three-phase voltage unbalance source positioning method, device and system | |
| CN108171960B (en) | Self-diagnosis method and system for abnormity of metering device of integrated energy management platform | |
| CN109950893A (en) | The active arc-extinguishing system of singlephase earth fault based on variable voltage source | |
| JP4110747B2 (en) | Harmonic monitoring system in power system | |
| CN112200998A (en) | Early fire early warning method and system applied to power equipment and storage medium thereof | |
| CN111610358A (en) | Method for calculating residual current by collecting three-phase and zero-sequence currents under three-phase four-wire system | |
| CN106019063A (en) | Fault indicator and fault detecting method | |
| CN103675569A (en) | Earth fault detection device and system for overhead line | |
| CN115327445A (en) | Method and system for judging abnormity of grounding currents of iron core and clamping piece of converter transformer | |
| WO2014192021A1 (en) | 4-wire 3-phase power grid sensor for monitoring minute load unbalance and harmonic noise | |
| CN110261713B (en) | Method for diagnosing AC side ground fault of converter of flexible DC power grid | |
| CN203772958U (en) | Wireless clamp-shaped phase detection device | |
| CN202929145U (en) | Device and system for aerial line grounding fault detection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |