CN110703039A - Rapid positioning method for distribution network line fault - Google Patents
Rapid positioning method for distribution network line fault Download PDFInfo
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- CN110703039A CN110703039A CN201910994362.XA CN201910994362A CN110703039A CN 110703039 A CN110703039 A CN 110703039A CN 201910994362 A CN201910994362 A CN 201910994362A CN 110703039 A CN110703039 A CN 110703039A
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Engineering & Computer Science (AREA)
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- Theoretical Computer Science (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Locating Faults (AREA)
Abstract
The method for rapidly positioning the distribution network line fault comprises the steps of determining the position of a substation node in a distribution network line and determining a branch structure based on the extension of the substation; acquiring sampling values at each terminal in a branch structure when any transformer substation supplies power; selecting at least two types of values from the sampled values; and determining the specific position of the fault based on the selected numerical value and the position of the transformer substation node currently supplied with power in the power distribution network line and the branch structure. The online fault location monitoring system of the distribution network guides workers to quickly and accurately find fault points, so that the working efficiency can be improved, and the labor intensity of the workers can be reduced.
Description
Technical Field
The invention belongs to the field of power distribution network management and control, and particularly relates to a rapid positioning method for distribution network line faults.
Background
The distribution network is directly related to users, and the operation stability and the power supply quality of the distribution network are directly reflected by the economic benefits of power enterprises and have immeasurable social benefits. Because the distribution network directly faces users and most of the distribution networks are open-air lines, the distribution network is easily influenced by external environment and uncertain factors, the distribution network system becomes one of the systems which are most prone to faults, and once the distribution network fails, a large-area user power failure phenomenon is directly caused, so that adverse social influence and huge economic loss are caused.
Under the current situation, once a distribution network fails, the position of the failure must be found by manually patrolling the line, and the time spent on finding the failure point far exceeds the time spent on repairing the failure, so that the power failure loss is increased.
Disclosure of Invention
In order to solve the defects and shortcomings in the prior art, the invention provides a rapid positioning method for the faults of the distribution network lines, which judges whether the faults occur or not by means of the sampling values of all terminals in the distribution network lines, and further determines the specific positions of the faults by means of the terminal position data with abnormal sampling values, so that the fault positioning time can be shortened, and the loss can be reduced.
Specifically, the method for quickly locating the fault of the distribution network line provided by the embodiment of the application comprises the following steps:
determining the position of a substation node in a power distribution network line and a branch structure extending from the substation;
acquiring sampling values at each terminal in a branch structure when any transformer substation supplies power;
selecting at least two types of values from the sampled values;
and determining the specific position of the fault based on the selected numerical value and the position of the transformer substation node currently supplied with power in the power distribution network line and the branch structure.
Optionally, the determining the position of the substation node in the distribution network line and the branch structure extending from the substation include:
screening out the node positions of the transformer substations in the current area according to the power planning diagram;
selecting terminals one by one along an output circuit of the transformer substation by taking the node position of the transformer substation as a center, and recording the equipment model and the geographic position data of the terminals;
and drawing a branch structure schematic diagram of the transformer substation based on the equipment model and the geographic position data of the terminal.
Optionally, when power is supplied to any substation, the obtaining of the sampling value at each terminal in the branch structure includes:
sampling voltage of a power distribution network line, and judging whether a transformer substation in a working state exists at present;
if so, sample values including voltage, current, voltage drop at each terminal in the known branched structure are obtained.
Optionally, the specific location of the fault is determined based on the selected numerical value in combination with the current power supply substation node location and the branch structure in the power distribution network line, and the determining includes:
acquiring a current sampling value of each terminal in a power distribution network line;
arranging the terminals in the power distribution network from near to far away from the transformer substation node positions, and counting sampling values at the terminals one by one;
the specific location of the fault occurrence in the branch structure is determined based on the statistical results.
Optionally, the determining a specific location of a fault occurring in the branch structure based on the statistical result includes:
if the short-circuit fault or the ground fault is judged to occur based on the statistical result, selecting the terminal with the fault from the sampling value;
the specific location of the fault occurrence is determined based on the address location data of the terminal.
The technical scheme provided by the invention has the beneficial effects that:
the online fault location monitoring system of the distribution network guides workers to quickly and accurately find fault points, so that the working efficiency can be improved, and the labor intensity of the workers can be reduced.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for rapidly locating a fault of a distribution network line according to an embodiment of the present disclosure;
fig. 2 is a first fault location diagram of a trunk line F1 according to an embodiment of the present invention;
fig. 3 is a diagram of a fault location of a main trunk line Fl according to an embodiment of the present application.
Detailed Description
To make the structure and advantages of the present invention clearer, the structure of the present invention will be further described with reference to the accompanying drawings.
Example one
In order to improve the operation stability of a 10kV power distribution network, improve the speed of searching fault points, reduce the power failure range and shorten the power failure time, a solid foundation is laid for the overall target of safe and stable operation of a power grid.
Meanwhile, the monitoring of distribution network faults is different at home and abroad, and at present, a power transmission line mainly comprises devices such as a power transmission line, a telegraph pole, an insulating material, a lightning arrester and the like, but because the devices are in the external environment for a long time, the devices are easily interfered by the external environment, so that the faults occur. Therefore, from the perspective of power transmission line equipment, distribution network fault monitoring systems at home and abroad are various, but there are the following types: line insulation monitoring system, insulator pollution condition monitoring system.
Most of the current line insulation monitoring systems are powered by three-phase alternating current, and the monitoring method is also applied to the situation. The principle is that insulation conditions of different low-voltage systems are continuously monitored by using a grounding neutral point, although one point of grounding may not have a big problem, if another point of grounding is provided, the low-voltage system can be greatly damaged. In order to ensure the stable operation of a low-voltage system, the system needs to solve the problem that when a certain point has a ground fault, alarm information can be sent out quickly and the fault position can be displayed. The line insulation monitoring system mainly has the following modes such as a pulse current method, an insulation resistance detection method and the like. The pulse current method only needs to be operated under a telegraph pole, the test object is subjected to local power generation after being pressurized, the instantaneous voltage change at two ends of the object is measured, the pulse current is measured by using related equipment, and finally the current and the voltage are calculated to see whether the object has problems. The insulation resistance rule is to divide the detected object into a plurality of minute resistances by direct calculation and then calculate the minute resistances by an integration method, but the method also needs to solve the problem that the probability distribution of the insulated object is inaccurate.
The method is mainly applied to the situation that the insulator leaks electricity under the high-voltage condition, the current and voltage data of the insulator are sent to a relevant monitoring center by a mobile network, and when the insulator is abnormal, alarm information is sent out and relevant workers are prompted to take corresponding measures.
The method for rapidly positioning the fault of the distribution network line, which is provided by the embodiment of the application, as shown in fig. 1, includes:
11. determining the position of a substation node in a power distribution network line and a branch structure extending from the substation;
12. acquiring sampling values at each terminal in a branch structure when any transformer substation supplies power;
13. selecting at least two types of values from the sampled values;
14. and determining the specific position of the fault based on the selected numerical value and the position of the transformer substation node currently supplied with power in the power distribution network line and the branch structure.
In implementation, the embodiment of the application designs a set of distribution network fault positioning method, and realizes basic functions required by monitoring master station software. The method realizes the integration of data transmitted by the communication host, displays the current and voltage values of each terminal in a circuit diagram, approximately calculates the position of a fault point, and has the functions of fault warning, line operation parameter display and the like. By using the method, the economic loss can be reduced, the economic benefit can be improved, and a basis is provided for the stable operation of the distribution network.
Optionally, the step of determining the branch structure provided in step 11 includes:
111. screening out the node positions of the transformer substations in the current area according to the power planning diagram;
112. selecting terminals one by one along an output circuit of the transformer substation by taking the node position of the transformer substation as a center, and recording the equipment model and the geographic position data of the terminals;
113. and drawing a branch structure schematic diagram of the transformer substation based on the equipment model and the geographic position data of the terminal.
The dual power supply line is taken as an example, and how to locate the fault position after the branch line has a fault is mainly described.
Fig. 2 is a schematic diagram of the location of a fault between L3 and L4 when the substation 1 is powered. If the branch of the L3 and the L4 has a fault, the terminals hung on the L1, the L2 and the L3 can test the current and the voltage which are different from normal values, and then the L1, the L2 and the L3 can transmit related messages to the system main station. The fault point is judged to be positioned between L3 and L4 according to the line position relation diagram and the hanging position of the detection terminal, and the software system alarms in a dialog box mode.
Fig. 3 is a schematic diagram of the location of a fault between L3 and L4 when the substation 2 is powered. If the branch of the L3 and the L4 has a fault, the terminals hung on the L4, the L5 and the L6 can detect the current and the voltage which are different from normal values, and then the L4, the L5 and the L6 can transmit related messages to the system main station. The fault point is judged to be positioned between L3 and L4 according to the line position relation diagram and the hanging position of the detection terminal, and the software system alarms in a dialog box mode.
Optionally, the obtaining of the sample value at the terminal in step 12 includes:
121. sampling voltage of a power distribution network line, and judging whether a transformer substation in a working state exists at present;
122. if so, sample values including voltage, current, voltage drop at each terminal in the known branched structure are obtained.
In implementation, the more kinds of sampling values, the higher the accuracy of locating a fault.
Optionally, the step 14 of locating the fault includes:
141. acquiring a current sampling value of each terminal in a power distribution network line;
142. arranging the terminals in the power distribution network from near to far away from the transformer substation node positions, and counting sampling values at the terminals one by one;
143. the specific location of the fault occurrence in the branch structure is determined based on the statistical results.
In practice, it is necessary to arrange the terminals in a manner from near to far in step 142, so as to find the nearest fault to the substation as soon as possible, so as to repair and reduce the loss caused by the fault as soon as possible.
Wherein the step of locating the fault set forth in step 143 comprises:
1431. if the short-circuit fault or the ground fault is judged to occur based on the statistical result, selecting the terminal with the fault from the sampling value;
1432. the specific location of the fault occurrence is determined based on the address location data of the terminal.
In the implementation of the method, the first step of the method,
the short-circuit fault judgment logic can judge the short-circuit fault only when the three conditions are met,
one is that the current value at a certain moment is larger than the starting value set by us (generally about 5A) to indicate that the current is on the line.
And two indicates that the fault current time is generally between O.02S and 3S.
And the third indicates that the current and the voltage on the substation are both 0.
A short-circuit fault is determined only when the above three conditions are satisfied.
The judgment logic of the ground fault can judge the ground fault only when the three conditions are met,
one is that the transient capacitance current is greater than the start value that we set to indicate that there is current on the line.
Two of them means that the voltage variation on the line must generally be greater than 30%.
And third, the current and voltage on the line are greater than 0.
The ground fault is determined only when the above three conditions are satisfied.
The fault positioning method can rapidly and accurately detect the ground fault and the short-circuit fault on line and send the collected characteristic information to the system main station. The online fault location monitoring system of the distribution network guides workers to quickly and accurately find fault points, and provides a powerful means for improving the working efficiency and reducing the labor intensity of the workers. By developing and utilizing the online fault location monitoring platform of the distribution network, the level of fault management of the distribution network is improved, the fault point is quickly searched, manpower and material resources are saved, the safety and the stability of operation of the distribution network are comprehensively improved, and finally the high-efficiency management of the distribution network is realized. And the reliability of power supply of the distribution network is improved by using an automatic and informatization means. The method is closely combined with the requirements of provincial and electric power companies, establishes a corresponding distribution network fault management method, and provides a convenient, standard and efficient management means. The service and the operation level of distribution network management are improved by using automatic and informatization management, and meanwhile, the load data of a real-time online monitoring line is provided, so that related workers can comprehensively know the operation state of the line.
The sequence numbers in the above embodiments are merely for description, and do not represent the sequence of the assembly or the use of the components.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The quick positioning method for the distribution network line fault is characterized by comprising the following steps:
determining the position of a substation node in a power distribution network line and a branch structure extending from the substation;
acquiring sampling values at each terminal in a branch structure when any transformer substation supplies power;
selecting at least two types of values from the sampled values;
and determining the specific position of the fault based on the selected numerical value and the position of the transformer substation node currently supplied with power in the power distribution network line and the branch structure.
2. The method of claim 1, wherein the determining of the substation node location in the distribution network line and the substation-extended branch structure based thereon comprises:
screening out the node positions of the transformer substations in the current area according to the power planning diagram;
selecting terminals one by one along an output circuit of the transformer substation by taking the node position of the transformer substation as a center, and recording the equipment model and the geographic position data of the terminals;
and drawing a branch structure schematic diagram of the transformer substation based on the equipment model and the geographic position data of the terminal.
3. The method for rapidly positioning the fault of the distribution network line according to claim 1, wherein the obtaining the sampling value at each terminal in the branch structure when any substation supplies power comprises:
sampling voltage of a power distribution network line, and judging whether a transformer substation in a working state exists at present;
if so, sample values including voltage, current, voltage drop at each terminal in the known branched structure are obtained.
4. The method for rapidly positioning the distribution network line fault according to claim 1, wherein the specific position of the fault is determined based on the selected numerical value in combination with the position of the substation node currently supplying power to the distribution network line and the branch structure, and the method comprises the following steps:
acquiring a current sampling value of each terminal in a power distribution network line;
arranging the terminals in the power distribution network from near to far away from the transformer substation node positions, and counting sampling values at the terminals one by one;
the specific location of the fault occurrence in the branch structure is determined based on the statistical results.
5. The method of claim 4, wherein the determining the specific location of the fault in the branch structure based on the statistical result comprises:
if the short-circuit fault or the ground fault is judged to occur based on the statistical result, selecting the terminal with the fault from the sampling value;
the specific location of the fault occurrence is determined based on the address location data of the terminal.
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Cited By (2)
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| CN114125825A (en) * | 2021-03-05 | 2022-03-01 | 珠海市鸿瑞信息技术股份有限公司 | Distribution network wireless network defense intelligent analysis platform based on trusted computing |
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Application publication date: 20200117 |