CN113311360A - Sectional type line grounding fault detection and isolation system and detection and isolation method thereof - Google Patents
Sectional type line grounding fault detection and isolation system and detection and isolation method thereof Download PDFInfo
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- CN113311360A CN113311360A CN202110588201.8A CN202110588201A CN113311360A CN 113311360 A CN113311360 A CN 113311360A CN 202110588201 A CN202110588201 A CN 202110588201A CN 113311360 A CN113311360 A CN 113311360A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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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)
- Automation & Control Theory (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Locating Faults (AREA)
Abstract
The invention relates to a sectional type line ground fault detection and isolation system and a detection and isolation method thereof. And recording the triggering time after the wide area synchronous circuit breaking controller detects that the ground fault of the system occurs. In the fault location detection module, it is determined whether the final output fault is located in a section between itself and an adjacent downstream wide area synchronous disconnect controller. Therefore, when a single-phase earth fault occurs, whether the single-phase earth fault occurs in the area can be quickly and accurately positioned according to the area information, the fault section is quickly switched for the fault in the area, and the more accurate fault section is reported to a superior platform or an end user.
Description
Technical Field
The invention relates to a fault isolation system in an electric power system and a detection isolation method thereof, in particular to a sectional type line ground fault detection isolation system and a detection isolation method thereof.
Background
Regarding the existing power line, the distribution line has many branches, long line and complex topology. When short circuit or ground fault occurs, the fault must be isolated and removed as soon as possible, otherwise the power supply quality and efficiency are seriously affected, and even the problem of power supply safety is brought.
In order to isolate and remove the fault as soon as possible without causing large-area power failure, the fault needs to be accurately positioned. At present, a distribution automation terminal FTU commonly used for a line basically adopts local isolation protection. During implementation, whether the fault line belongs to the fault line and is positioned at the upstream of the fault is judged according to the characteristics of the zero sequence current and the zero sequence voltage acquired by the fault line.
However, in practical application, the accuracy of fault detection is not high according to the data characteristics of single points. Furthermore, an FTU in a certain location cannot know whether it is located upstream of the nearest neighbor of the failure.
In order to solve the problem, the prior art basically adopts a centralized type, namely, the FTU reports a positioning result of a criterion to the master station, the master station completes fault positioning in a unified way, and then the FTU adjacent to and upstream of a fault point is remotely controlled to isolate a fault interval.
In another method, the fault self-healing is realized by detecting that the FTU devices which are at the upstream of the fault point are in a time-delay matching and reclosing principle. During implementation, the line needs to be powered off first, and the requirements on timing matching and reclosing are high. From the field application, a scheme capable of supporting accurate positioning of the ground fault and completing quick isolation in situ is more needed.
In view of the above-mentioned drawbacks, the present designer actively makes research and innovation to create a sectional type line ground fault detection and isolation system and a detection and isolation method thereof, so that the system has industrial application value.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a sectional type line ground fault detection and isolation system and a detection and isolation method thereof.
The invention discloses a sectional type line ground fault detection and isolation system, which comprises: the wide area synchronous circuit breaker controller is arranged at the upstream and the downstream, and if a plurality of branches exist at the downstream, the wide area synchronous circuit breaker controller is also arranged on the branch; the wide area synchronization characteristic is based on time service of a GPS/Beidou satellite system; or based on the time service of the 5G communication system, at least two remote transmission communication modules are arranged in the wide area synchronous circuit breaker controller, and one remote transmission communication module is responsible for communicating with a distribution automation master station or other superior platforms; the other remote communication module is responsible for communicating with the wide area synchronous phase current sensor in the area or the adjacent downstream wide area synchronous circuit breaking controller.
Further, in the system for detecting and isolating a regional ground fault, a low-power-consumption microprocessor is arranged in the wide-area synchronous open circuit controller, and is used for completing the operation of a fault detection and positioning algorithm after collecting the recording data of the region under jurisdiction, judging whether the fault occurs in the region, and if so, sending the positioning section to a superior platform.
Furthermore, in the aforementioned sectional type line ground fault detection and isolation system, the wide area synchronous circuit breaker controller is a fusion circuit breaker provided with a circuit breaker and a controller.
The sectional type line ground fault detection and isolation method comprises the following steps:
after detecting the occurrence of a ground fault of a system, a wide area synchronous circuit breaking controller records a trigger moment, sends a test calling instruction to a wide area synchronous circuit breaking controller adjacent to the downstream wide area synchronous circuit breaking controller and acquires a test calling waveform;
step two, after receiving the calling waveform, the wide area synchronous circuit breaking controller arranged at the upstream judges whether the final output fault is positioned in a section between the wide area synchronous circuit breaking controller and the adjacent downstream wide area synchronous circuit breaking controller in a fault positioning detection module;
and step three, after the wide area synchronous circuit breaking controller at the upstream position confirms that the ground fault occurs between the device and the adjacent wide area synchronous circuit breaking controller at the downstream, monitoring the duration of the zero sequence voltage abnormity, starting a tripping process and controlling the circuit breaker to be disconnected.
Further, in the method for detecting and isolating a segment-type line ground fault, the acquisition mode of the recalled waveform in the first step is to acquire a three-phase current recording waveform of the wide area synchronous type phase current sensor between the downstream wide area synchronous open-circuit controller and the adjacent downstream wide area synchronous open-circuit controller at the same time, and recall the three-phase current recording waveform of the downstream wide area synchronous type phase current sensor if the wide area synchronous type open-circuit controller has no other wide area synchronous type open-circuit controllers at the downstream.
Furthermore, in the above-mentioned method for detecting and isolating a sectional type line ground fault, in the second step, fault detection and location are completed by an algorithm based on comparison of multipoint zero-sequence currents.
Furthermore, in the method for detecting and isolating the sectional type line ground fault, a preset threshold T1 and a time delay parameter T2 are set; when the duration time exceeds a set threshold T1, starting a tripping process, controlling the breaker to be disconnected and realizing the isolation of a fault section; after tripping, if the time delay meets T2, the breaker is switched on, after switching on, if the zero sequence voltage is abnormal again, the tripping process is restarted immediately, otherwise, the tripping process is not started again; the T1 ranges from 5 seconds to 90 seconds, and the T2 ranges from 0 second to 180 seconds.
By the scheme, the invention at least has the following advantages:
1. when single-phase earth faults occur, whether the faults occur in the area can be quickly and accurately positioned according to the area information, the fault sections are quickly switched for the faults in the area, and more accurate fault sections are reported to a superior platform or an end user.
2. Compared with the existing centralized master station scheme, the method has higher efficiency and quicker fault removal, also avoids the series of problems caused by possible remote control switching-on and switching-off failure, and reduces the communication requirements and the algorithm requirements on the master station.
3. Compared with single-point zero-sequence overcurrent protection, the fault location is more accurate, the power supply reliability is higher, and the method is an optimization scheme for rapidly and accurately isolating the fault interval.
4. The layout is simpler, and the layout is easy to implement.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic layout of a segmented line-to-ground fault detection isolation system.
Fig. 2 is a flow chart of a segmented line-to-ground fault detection isolation method.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The sectional line ground fault detection isolation system as shown in fig. 1 to 2 is distinguished by: the wide-area synchronous circuit breaker comprises a plurality of sets of wide-area synchronous circuit breaker controllers with wide-area synchronous characteristics and wide-area synchronous phase current sensors. During the implementation, the wide area synchronous circuit breaking controllers are installed at the upstream and the downstream, and if a plurality of branches exist at the downstream, the wide area synchronous circuit breaking controllers are also installed at the branches. In order to find faults at the first time and guarantee effective time service communication, the wide area synchronization characteristic adopted by the invention is based on GPS/Beidou satellite system time service. Of course, time transfer may be performed based on the 5G communication system. And, the wide area synchronous type circuit breaking controller is internally provided with at least two remote transmission communication modules. Specifically, a remote transmission communication module is responsible for communicating with a distribution automation master station or other superior platforms; the other remote communication module is responsible for communicating with the wide area synchronous phase current sensor in the area or the adjacent downstream wide area synchronous circuit breaking controller.
In combination with a preferred embodiment of the present invention, in order to implement convenient and fast autonomous data processing, corresponding detection calculation can be performed for different recording data, and a low-power-consumption microprocessor is disposed in the wide-area synchronous circuit breaker controller. During implementation, the method is used for completing the operation of the fault detection positioning algorithm after collecting the recording data of the administered area. Meanwhile, the low-power microprocessor can be used for judging whether the fault occurs in the area, and if the fault occurs in the area, the positioning section is sent to a superior platform.
Moreover, the wide-area synchronous circuit breaker controller can be a fusion circuit breaker provided with a circuit breaker and a controller in consideration of the requirements of certain special applications.
In view of the actual layout, as shown in fig. 1, QFA, QFB, QFC, and QFD are wide area synchronous breaker controllers (which can be regarded as wide area synchronous phase current sensors because they have a synchronous measurement function). A1, a2, A3, a5, a6, a9, a10, and a11 are wide-area synchronous phase current sensors.
Meanwhile, QFA, A1, A2, A3 and QFB form an area, and the QFA and the A1, A2, A3 and the QFB are in communication, and A1, A2, A3 and the QFB do not need to be in communication with each other. QFB, A5, A6, QFC and QFD form an area, the QFB communicates with A5, A6, QFC and QFD, and A5, A6, the QFC and the QFD do not need to communicate with each other.
In order to better use the system provided by the invention, a sectional type line ground fault detection and isolation method is provided, which comprises the following steps:
step one, after a wide area synchronous open circuit controller detects that a ground fault of a system occurs, recording a trigger moment, sending a test calling instruction to a wide area synchronous open circuit controller adjacent to the downstream wide area synchronous open circuit controller, and acquiring a test calling waveform. The ground fault to which the present invention relates may include zero sequence voltage or zero sequence current over-limit. Meanwhile, other conventional ground faults can be included, and are not described in detail herein.
In view of practical implementation, the adopted calling-measuring waveform acquisition mode is to acquire the three-phase current recording waveform of the wide-area synchronous phase current sensor between the downstream wide-area synchronous open-circuit controller and the adjacent downstream wide-area synchronous open-circuit controller at the same time (the absolute time service time scale is acquired by adopting a GPS/Beidou based or 5G communication system, and the precision is 1 microsecond). If the wide area synchronous type circuit breaking controller has no other wide area synchronous type circuit breaking controller at the downstream, the three-phase current recording waveform of the wide area synchronous type phase current sensor at the downstream is called up to be measured.
And step two, after receiving the calling waveform, the wide area synchronous circuit breaking controller arranged at the upstream judges whether the final output fault is positioned in a section between the wide area synchronous circuit breaking controller and the adjacent downstream wide area synchronous circuit breaking controller in a fault positioning detection module. Therefore, fault detection and positioning can be completed through an algorithm based on comparison of multipoint zero-sequence currents and by combining various comprehensive algorithms such as a zero-sequence power direction and the like.
And step three, after the wide area synchronous circuit breaking controller at the upstream position confirms that the ground fault occurs between the device and the adjacent wide area synchronous circuit breaking controller at the downstream, monitoring the duration of the zero sequence voltage abnormity, starting a tripping process and controlling the circuit breaker to be disconnected.
Specifically, the preset threshold T1 and the delay parameter T2 may be set in consideration of different time requirements of different grounding systems and lines for ground fault isolation. And when the duration time exceeds a set threshold T1, starting a tripping process, controlling the breaker to be disconnected and realizing the isolation of the fault section. Meanwhile, the T1 time limit may be set to be short in order to avoid transient faults. The specific T1 time limit setting may be 15 seconds, and the setting range is preferably 5 seconds to 90 seconds
After tripping, if the time delay meets T2, the breaker is switched on, after switching on, if the zero sequence voltage is abnormal again, the tripping process is restarted immediately, otherwise, the breaker is not switched off. Thus, the automatic reclosing mechanism based on the zero sequence voltage is added. The default value of T2 may take 30 seconds, and the setting range is preferably 15 seconds to 180 seconds.
T1 ranges from 5 seconds to 90 seconds, and T2 ranges from 0 to 180 seconds. The whole process is described in fig. 2.
The invention has the following advantages by the aid of the character expression and the accompanying drawings:
1. when single-phase earth faults occur, whether the faults occur in the area can be quickly and accurately positioned according to the area information, the fault sections are quickly switched for the faults in the area, and more accurate fault sections are reported to a superior platform or an end user.
2. Compared with the existing centralized master station scheme, the method has higher efficiency and quicker fault removal, also avoids the series of problems caused by possible remote control switching-on and switching-off failure, and reduces the communication requirements and the algorithm requirements on the master station.
3. Compared with single-point zero-sequence overcurrent protection, the fault location is more accurate, the power supply reliability is higher, and the method is an optimization scheme for rapidly and accurately isolating the fault interval.
4. The layout is simpler, and the layout is easy to implement.
Furthermore, the indication of the orientation or the positional relationship described in the present invention is based on the orientation or the positional relationship shown in the drawings, and is only for convenience of describing the present invention and simplifying the description, but does not indicate or imply that the indicated device or configuration must have a specific orientation or be operated in a specific orientation configuration, and thus, should not be construed as limiting the present invention.
The terms "primary" and "secondary" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "primary" or "secondary" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Also, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "disposed" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other or mutually interacted. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. And it may be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings, which are used for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. Sectional type line ground fault detection isolated system, its characterized in that: the wide area synchronous circuit breaker controller is arranged at the upstream and the downstream, and if a plurality of branches exist at the downstream, the wide area synchronous circuit breaker controller is also arranged on the branch; the wide area synchronization characteristic is based on time service of a GPS/Beidou satellite system; or based on the time service of the 5G communication system, at least two remote transmission communication modules are arranged in the wide area synchronous circuit breaker controller, and one remote transmission communication module is responsible for communicating with a distribution automation master station or other superior platforms; the other remote communication module is responsible for communicating with the wide area synchronous phase current sensor in the area or the adjacent downstream wide area synchronous circuit breaking controller.
2. The segmented line-to-ground fault detection isolation system of claim 1, wherein: the wide area synchronous type circuit breaking controller is internally provided with a low power consumption microprocessor which is used for completing the operation of a fault detection positioning algorithm after collecting the recording data of the region under jurisdiction, judging whether a fault occurs in the region, and if so, sending the positioning section to a superior platform.
3. The segmented line-to-ground fault detection isolation system of claim 1, wherein: the wide-area synchronous circuit breaker controller is a fusion circuit breaker provided with a circuit breaker and a controller.
4. The sectional type line ground fault detection and isolation method is characterized by comprising the following steps:
after detecting the occurrence of a ground fault of a system, a wide area synchronous circuit breaking controller records a trigger moment, sends a test calling instruction to a wide area synchronous circuit breaking controller adjacent to the downstream wide area synchronous circuit breaking controller and acquires a test calling waveform;
step two, after receiving the calling waveform, the wide area synchronous circuit breaking controller arranged at the upstream judges whether the final output fault is positioned in a section between the wide area synchronous circuit breaking controller and the adjacent downstream wide area synchronous circuit breaking controller in a fault positioning detection module;
and step three, after the wide area synchronous circuit breaking controller at the upstream position confirms that the ground fault occurs between the device and the adjacent wide area synchronous circuit breaking controller at the downstream, monitoring the duration of the zero sequence voltage abnormity, starting a tripping process and controlling the circuit breaker to be disconnected.
5. The segmented line-to-ground fault detection isolation method of claim 4, wherein: the first step of calling up the waveform acquisition mode is that the three-phase current recording waveform of the wide area synchronous type phase current sensor between the downstream wide area synchronous open circuit controller and the adjacent downstream wide area synchronous open circuit controller at the same moment is acquired, and if the wide area synchronous open circuit controller does not have other wide area synchronous open circuit controllers at the downstream, the three-phase current recording waveform of the downstream wide area synchronous type phase current sensor is called up and measured.
6. The segmented line-to-ground fault detection isolation method of claim 4, wherein: and in the second step, fault detection and positioning are completed through an algorithm based on comparison of the zero sequence currents of multiple points.
7. The segmented line-to-ground fault detection isolation method of claim 4, wherein: in the third step, a preset threshold T1 and a time delay parameter T2 are set,
when the duration time exceeds a set threshold T1, starting a tripping process, controlling the breaker to be disconnected and realizing the isolation of a fault section;
after tripping, if the time delay meets T2, the breaker is switched on, after switching on, if the zero sequence voltage is abnormal again, the tripping process is restarted immediately, otherwise, the tripping process is not started again;
the T1 ranges from 5 seconds to 90 seconds, and the T2 ranges from 0 second to 180 seconds.
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| CN114019872A (en) * | 2021-11-05 | 2022-02-08 | 中冶赛迪电气技术有限公司 | Circuit breaker opening and closing time sequence and fault judgment logic control system thereof |
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| CN113311360B (en) | 2022-09-13 |
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