CN114034982A - Floating system direct current system ground fault point positioning method and system - Google Patents
Floating system direct current system ground fault point positioning method and system Download PDFInfo
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- CN114034982A CN114034982A CN202111356077.9A CN202111356077A CN114034982A CN 114034982 A CN114034982 A CN 114034982A CN 202111356077 A CN202111356077 A CN 202111356077A CN 114034982 A CN114034982 A CN 114034982A
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- 238000004891 communication Methods 0.000 claims description 50
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- 238000012806 monitoring device Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
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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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- 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
Abstract
The invention discloses a method and a system for positioning a ground fault point of a floating system direct current system, which are characterized in that according to the principle that after a power supply end of a Hall element is connected with working voltage, current is introduced into a control current loop of the Hall element, current carriers can deflect, and a potential can be generated in the direction vertical to the current and a magnetic field, and the potential is in direct proportion to the vector sum of the current introduced into the control loop, the output voltages of a plurality of Hall elements connected to the same feeder branch are collected, and are compared pairwise to judge whether the output voltages are consistent, so that whether the ground fault occurs between lower computers to which two Hall elements belong in the floating system direct current system is judged, and the ground fault point in the floating system direct current system is positioned. According to the method, the floating system direct current system does not need to be checked one by one after the ground fault is found, and the ground fault point can be found in the floating system direct current system only by detecting the output voltage of the Hall element and locking the corresponding lower computer, so that the ground fault point can be quickly positioned.
Description
Technical Field
The invention relates to the technical field of positioning of a ground fault point of a direct current system, in particular to a method and a system for positioning a ground fault point of a floating system direct current system.
Background
The direct current system is mainly applied to power plants and substations and is used for energy supply of work of a protection device and opening and closing operations of a breaker. Once a dc system ground fault occurs and is not solved for a long time, the dc system ground fault develops into multipoint grounding, which may cause fuse blowing, relay contact burning, and circuit breaker malfunction or failure, thereby threatening the safe and stable operation of the power system.
At present, a direct current system grounding monitoring device or a direct current grounding searching instrument has a function of screening out a direct current grounding fault feeder branch. However, because the dc system branch is huge and complex, even if the feeder branch with the ground fault is screened out, it is difficult to quickly locate the specific position with the dc ground fault, which increases the risk of the operation of the protection devices and the power grid in the power plant and the substation.
In view of this, the present application is specifically made.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing direct current system grounding monitoring device cannot be quickly positioned to a specific position where a direct current grounding fault occurs, and the purpose is to provide a floating system direct current system grounding fault point positioning method and system, which can realize quick positioning of a floating system direct current system grounding fault point.
The invention is realized by the following technical scheme:
in one aspect, the invention provides a method for positioning a ground fault point of a floating system direct current system, which comprises the following steps:
simultaneously connecting a plurality of lower computers connected to the same feeder branch into working voltage;
pairing the lower computers pairwise to obtain a plurality of lower units;
respectively acquiring output voltages of Hall elements of two lower computers in each lower computer unit, and respectively labeling corresponding output voltage values for the two lower computers;
and aiming at each lower computer set, judging whether a ground fault occurs between the two lower computers in the set according to the output voltage value, if so, finding out the positions of the two lower computers in the floating system direct current system, marking the positions of the fault points, and finishing the positioning of the fault points.
Compared with the prior art, according to the principle that after the power supply end of the Hall element is connected with working voltage, current is introduced into a control current loop of the Hall element, current carriers can deflect and generate a potential in the direction perpendicular to the current and the magnetic field, the potential is in direct proportion to the vector sum of the current introduced into the control loop, and whether output voltages of a plurality of Hall elements connected to the same feeder branch are consistent or not is judged by collecting the output voltages of the Hall elements, and the output voltages are compared pairwise so as to judge whether a ground fault occurs between lower computers to which the two Hall elements belong in a floating system direct current system, so that a ground fault point in the floating system direct current system is positioned. According to the method, the floating system direct current system does not need to be checked one by one after the ground fault is found, and the ground fault point can be found in the floating system direct current system only by detecting the output voltage of the Hall element and locking the corresponding lower computer, so that the ground fault point can be quickly positioned.
As a further description of the present invention, the method for determining the ground fault includes: comparing whether the output voltage values of the two lower computers are consistent or not; if the two lower computers are consistent, judging that no ground fault occurs between the two lower computers; otherwise, judging that the two lower computers have ground faults.
As a further description of the present invention, after the fault point is located, the position of the fault point in the floating system dc system is displayed in a graphical interface.
As a further description of the present invention, after the fault point is located, the locating result is sent to the background server, and the locating result is associated to other devices or systems through the background server.
In another aspect, the present invention provides a system for locating a ground fault point of a floating system dc system, comprising: a plurality of lower computers and upper computers; the lower computers are connected to the same feeder line branch circuit and comprise Hall elements and a microprocessor which are connected with each other, and power supply ends of the Hall elements are connected to working voltage; the upper computer comprises a central processing unit; the microprocessor is connected with the central processing unit.
As a further description of the present invention, the lower computer includes a first wireless communication device, the first wireless communication device being connected with the microprocessor; the upper computer comprises second wireless communication equipment which is in signal connection with the first wireless communication equipment.
As a further description of the present invention, the floating dc system ground fault point positioning system further includes a management background, where the management background includes a fourth wireless communication device and a server, and the fourth wireless communication device is connected to the server through a USB structure; the upper computer comprises a third wireless communication device; the third wireless communication device is connected with the central processing unit, and the third wireless communication device is in signal connection with the fourth wireless communication device.
As a further description of the present invention, the upper computer includes a display, and the display is connected to the central processing unit.
As a further description of the present invention, the upper computer includes a removable power supply, and the removable power supply is connected to the central processing unit.
As a further description of the present invention, the upper computer is a portable device.
Compared with the prior art, the invention has the following advantages and beneficial effects: the direct-current grounding fault point locating and fast moving device can improve the action of ground fault point locating and fast moving and improve the defect eliminating efficiency, can solve the problems that in the prior art, a direct-current system grounding monitoring device or a direct-current grounding searching instrument can only screen out a feeder line branch circuit with a ground fault and is difficult to fast locate to a specific position with the direct-current grounding fault, and has positive significance for improving the ground fault point locating and fast moving and improving the defect eliminating efficiency and guaranteeing the safe and stable operation of a protection device and a power grid in a power plant and a transformer substation.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a floating system dc system ground fault point positioning system framework provided in embodiment 2 of the present invention.
Reference numbers and corresponding part names in the drawings:
1-a lower computer, 2-an upper computer, 3-a management background, 11-a Hall element, 12-a microprocessor, 13-a first wireless communication device, 21-a central processing unit, 22-a second wireless communication device, 23-a third wireless communication device, 24-a display, 25-a movable power supply, 31-a fourth wireless communication device and 32-a server.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
Example 1
The embodiment provides a method for positioning a ground fault point of a floating system direct current system aiming at the problem that the existing direct current system ground monitoring device cannot quickly position a specific position where a direct current ground fault occurs. Therefore, the method does not need to check the floating system DC system one by one after the ground fault is found, and can find the ground fault point in the floating system DC system only by detecting the output voltage of the Hall element and locking the corresponding lower computer, thereby realizing the quick positioning of the ground fault point. The method specifically comprises the following steps:
step 1: and simultaneously, a plurality of lower computers connected to the same feeder line branch are connected to working voltage, so that the control current loop of the Hall element in the lower computer is connected with current with the magnitude within the range of the measurement range. When a current is applied to the control current loop, the carriers will deflect, creating a potential in a direction perpendicular to the current and magnetic field that is proportional to the vector sum of the current applied to the control current loop.
According to this principle, the following steps are carried out:
step 2: and pairwise pairing the plurality of lower computers to obtain a plurality of lower units.
Because a plurality of pairwise matching relations may occur between a plurality of lower computers connected to the same feeder line branch, for example, the lower computer a, the lower computer B and the lower computer C connected to the same feeder line branch may occur: the lower computer a is matched with the lower computer B, the lower computer a is matched with the lower computer C, and the lower computer B is matched with the lower computer C, so that ground faults can occur between the lower computers a and B, between the lower computers a and C, and between the lower computers B and C. In the floating system dc system with more lower computers, the relationship between the lower computers in pairs is more complicated. Therefore, all pairwise matching relations which possibly exist between all the lower computers are listed, and preparation is made for carrying out pairwise comparison on output voltages in the groups and further locking the ground fault point.
And step 3: and aiming at each lower computer set, respectively acquiring the output voltages of the Hall elements of the two lower computers in the set, and respectively labeling the corresponding output voltage values for the two lower computers.
During the operation of the floating system dc system, the positive or negative feeder branch of the same dc loop is usually passed through the control current loop of the hall element separately. When the feeder line is not grounded, the currents flowing through the head end and the tail end of the positive feeder line branch or the negative feeder line branch are equal, so that the potentials output by the output ends of the Hall elements of the same lower unit are equal. When the feeder is grounded, the positive feeder branch or the negative feeder branch generates a branch current, and the magnitudes of the currents flowing through the head end and the tail end of the positive feeder branch or the negative feeder branch are unequal, so that the potentials output by the output ends of the Hall elements of the same lower unit are unequal. Therefore, a plurality of lower computers are installed on the same branch, and as long as the voltage output by the Hall elements of different lower computers on the same branch is inconsistent, a ground fault exists between the installation positions of the two lower computers.
And 4, step 4: and aiming at each lower computer set, judging whether a ground fault occurs between the two lower computers in the set according to the output voltage value, if so, finding out the positions of the two lower computers in the floating system direct current system, marking the positions of the fault points, and finishing the positioning of the fault points.
According to the working principle of the step 3, the method for judging the ground fault comprises the following steps: comparing whether the output voltage values of the two lower computers are consistent or not; if the two lower computers are consistent, judging that no ground fault occurs between the two lower computers; otherwise, judging that the two lower computers have ground faults.
In order to clearly and visually reflect the ground fault point in the floating system direct current system, the position of the fault point in the floating system direct current system can be displayed in a graphical interface mode, and therefore workers can more accurately and quickly locate the ground fault point.
In addition, as an extension of the method for positioning the ground fault point of the floating system dc system provided in this embodiment, this embodiment further provides that after the positioning of the fault point is completed, the positioning result is sent to the background server, and the background server associates the positioning result with other devices or systems, so as to facilitate interaction and utilization of the positioning result.
The method for positioning the ground fault point of the floating system direct current system can improve the positioning and quick movement of the ground fault point and improve the defect eliminating efficiency, can solve the problem that a traditional direct current system ground monitoring device or a direct current ground searching instrument can only screen out a feeder line branch circuit with the ground fault and is difficult to quickly position to a specific position with the direct current ground fault, and has positive significance for improving the positioning and quick movement of the ground fault point, improving the defect eliminating efficiency and ensuring the safe and stable operation of a protection device and a power grid in a power plant and a transformer substation.
Example 2
In order to create an execution condition for the floating system dc system ground fault location method of embodiment 1, this embodiment correspondingly provides a floating system dc system ground fault location system, a system framework of which is shown in fig. 1, and includes: 3 lower computer 1, 1 host computer 2 and 1 management backstage 3, 3 lower computer 1 connect on same feeder branch road. Each lower computer 1 comprises 1 Hall element 11, 1 microprocessor 12 and 1 first wireless communication device 13 which are connected in sequence; the upper computer 2 comprises 1 central processor 21, 1 secondary wireless communication device 22, 1 tertiary wireless communication device 23, 1 display 24 and 1 movable power supply 25, and the secondary wireless communication device, the tertiary wireless communication device, the display 24 and the movable power supply 25 are all connected with the central processor 21; the management background 3 comprises 1 four-stage wireless communication device and 1 server 32, and the four-stage wireless communication device is connected with the server 32 through a USB interface.
In the communication mode between each level, the lower computer 1 and the upper computer 2 are realized by signal transmission through the first wireless communication device 13 and the second wireless communication device 22, and the upper computer 2 and the management background 3 are realized by signal transmission through the third wireless communication device 23 and the fourth wireless communication device 31.
In each lower computer 1, the microprocessor 12 collects the output voltage of the hall element 11 in real time, transmits the output voltage value to the first wireless communication device 13 after processing, and transmits the output voltage value to the upper computer 2 by the first wireless communication device 13 in a wireless signal mode. The upper computer 2 receives the wireless signals transmitted by the lower computers 1 through the second wireless communication equipment 22, sends the wireless signals to the central processing unit 21 for analysis and processing, judges whether a ground fault exists between every two lower computers 1, generates a final result, and sends the final result to the display 24 and the third wireless communication equipment 23 respectively. The display 24 displays the final result in an image mode under the control of the central processing unit 21, and intuitively reflects which lower computer 1 the ground fault occurs between in the floating system direct current system; the third wireless communication device 23 transmits the final result to the fourth wireless communication device 31 in a wireless signal manner, and the fourth wireless communication device 31 transmits the received final result to the server 32 for other devices or systems to collect relevant information.
In this embodiment, the hall element 11 is a medium-hall CHDC-EA-0.01P5O5 high-precision direct current leakage current sensor; microprocessor 12 employs an STM32F429BIT6 core board; the first wireless communication device 13 employs an nRF24L01P wireless communication module of E01-ML01DP5 type; the second wireless communication device 22 and the third wireless communication device 23 employ nRF24L01P wireless communication modules of E01-ML01DP5 type; the central processing unit 21 adopts a TMS320C28346 core board; the display 24 adopts a 7-inch RGB liquid crystal screen; the movable power supply 25 is a rechargeable lithium battery and is formed by connecting 2 sections of 5V lithium batteries in series, and the capacity of a single lithium battery is 1000 mA; the fourth wireless communication device 31 adopts an nRF24L01 wireless USB serial port module; the server 32 may be a computer host. .
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for positioning a ground fault point of a floating system direct current system is characterized by comprising the following steps:
simultaneously connecting a plurality of lower computers connected to the same feeder branch into working voltage;
pairing the lower computers pairwise to obtain a plurality of lower units;
respectively acquiring output voltages of Hall elements of two lower computers in each lower computer unit, and respectively labeling corresponding output voltage values for the two lower computers;
and aiming at each lower computer set, judging whether a ground fault occurs between the two lower computers in the set according to the output voltage value, if so, finding out the positions of the two lower computers in the floating system direct current system, marking the positions of the fault points, and finishing the positioning of the fault points.
2. The method for locating the ground fault point of the floating brake direct-current system according to claim 1, wherein the method for determining the ground fault is as follows: comparing whether the output voltage values of the two lower computers are consistent or not; if the two lower computers are consistent, judging that no ground fault occurs between the two lower computers; otherwise, judging that the two lower computers have ground faults.
3. The method for locating the ground fault point of the floating air system according to claim 1 or 2, wherein after the fault point is located, the position of the fault point in the floating air system is displayed in a graphical interface mode.
4. The method for positioning the ground fault point of the floating system direct current system according to claim 1 or 2, wherein after the fault point is positioned, the positioning result is sent to a background server, and the positioning result is associated with other devices or systems through the background server.
5. A floating system DC system ground fault point positioning system is characterized by comprising: a plurality of lower computers (1) and upper computers (2); the lower computers (1) are connected to the same feeder line branch circuit, each lower computer (1) comprises a Hall element (11) and a microprocessor (12), the Hall elements (11) are connected with each other, and a power supply end of each Hall element (11) is connected with a working voltage; the upper computer (2) comprises a central processing unit (21); the microprocessor (12) is connected with the central processing unit (21).
6. A floating DC system ground fault point locating system according to claim 5, characterized in that the lower computer (1) comprises a first wireless communication device (13), the first wireless communication device (13) is connected with the microprocessor (12); the upper computer (2) comprises a second wireless communication device (22), and the second wireless communication device (22) is in signal connection with the first wireless communication device (13).
7. The floating direct current system ground fault point positioning system according to claim 5, characterized by comprising a management background (3), wherein the management background (3) comprises a fourth wireless communication device (31) and a server (32), and the fourth wireless communication device (31) is connected with the server (32) through a USB structure; the upper computer (2) comprises a third wireless communication device (23); the third wireless communication device (23) is connected with the central processing unit (21), and the third wireless communication device (23) is in signal connection with the fourth wireless communication device (31).
8. The floating system direct current system ground fault point positioning system according to claim 5, wherein the upper computer (2) comprises a display (24), and the display (24) is connected with the central processing unit (22).
9. The floating system direct current system ground fault point positioning system according to claim 5, wherein the upper computer (2) comprises a movable power supply (25), and the movable power supply (25) is connected with the central processing unit (22).
10. The floating system direct current system ground fault point positioning system according to claim 5, wherein the upper computer (2) is a portable device.
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| CN202111356077.9A CN114034982A (en) | 2021-11-16 | 2021-11-16 | Floating system direct current system ground fault point positioning method and system |
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