CN113702778A - GIL arc discharge fault positioning method and system - Google Patents
GIL arc discharge fault positioning method and system Download PDFInfo
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- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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Abstract
The invention belongs to the technical field of power transmission and transformation monitoring, and discloses a GIL arc discharge fault positioning method and a system, wherein the method comprises the following steps: and respectively measuring and calculating the first fault area location and the third fault area location by a single-end traveling wave method and a double-end traveling wave method, calculating the second fault area location by the time difference of the traveling wave and the ultrasonic signal reaching the corresponding detection point, analyzing the three location results to obtain the fault comprehensive location, reversely deducing the traveling wave speed transmitted in the GIL according to the three location results, and substituting the traveling wave speed into the single-end traveling wave method to perform optimization operation so as to more accurately and comprehensively locate the fault in the following process. The invention also provides a GIL arc discharge fault positioning system which comprises an ultrasonic sensor, a traveling wave sensor and a processing circuit containing a calculation module, wherein the processing circuit can execute the method. The method solves the problems that the positioning result of the traveling wave method is low in precision and poor in reliability, and the ultrasonic method needs more sensors, and realizes accurate and reliable positioning of the electric arc fault of the GIL equipment. The method is suitable for fault monitoring of the GIL equipment.
Description
Technical Field
The invention belongs to the technical field of power transmission and transformation monitoring, and particularly discloses a GIL arc discharge fault positioning method and system.
Background
A Gas-insulated Transmission line (GIL), is a power Transmission apparatus in which a compressed SF6 Gas (or mixed Gas insulation) is used, and a housing and a conductor are coaxially arranged. The GIL has the advantages of large transmission capacity, low unit loss, small environmental influence, high operation reliability, land occupation saving and the like, and is widely applied to electric energy sending occasions of hydropower stations and nuclear power stations for a long time.
Insulation defects can be generated in the GIL in all links such as manufacturing, transportation and field assembly of the GIL, and arc breakdown faults are easily caused in a GIL withstand voltage test or daily operation. Because the GIL has large transmission capacity, once the arc discharge occurs in the GIL, if the fault position can not be quickly and accurately positioned and repaired in time, the electric energy transmission of the whole transmission line is seriously influenced, and the economic loss and the social influence are great.
Currently, GIL engineering applications are not yet widespread, so that a method for positioning an arc discharge fault of a GIS is generally used for reference in practice, and mainly comprises the following steps: the method comprises the following steps of manual monitoring, an arc light method, an ultrasonic method, a traveling wave method and the like, wherein the ultrasonic method and the ultrahigh frequency method are more applied to engineering sites.
The manual monitoring method mainly comprises the steps of pressurizing repeatedly in a segmented mode and judging according to the auditory sense of human ears, wherein a worker is arranged at a certain distance in the field test process and stands nearby, and once breakdown occurs, the nearby worker can judge the approximate breakdown position through sound. The method is time-consuming and labor-consuming, is very easily influenced by field environment and human subjective factors, has large positioning error, and can cause damage to equipment due to repeated disassembly and pressurization tests.
The arc method is to monitor the discharge arc light and to position the discharge arc light according to the discharge electromagnetic wave pulse, however, a hole needs to be formed in the case, the original structure of the GIL is destroyed, and an arc signal generated by flashover is easily affected by the body structure, and although the sensitivity is high, the arc signal cannot be recognized in the early stage of partial discharge.
The ultrasonic method monitors by monitoring ultrasonic signals generated by discharge, and determines the position of a fault point by monitoring and analyzing the amplitude or time delay of signals received by each microphone during fault, although the positioning reliability is high, and the insulation, sealing performance and internal electric field distribution of the GIL body are not influenced by the external arrangement of the sensor. However, the sensor monitoring distance is short due to large attenuation of the acoustic wave transmission.
And in the traveling wave method, steep wave sensors arranged at two ends of each phase GIL are utilized to transmit signals to the GPS synchronization unit at the side, and the time difference is calculated through second pulse signals output by the GPS at the two ends, so that a fault positioning result is obtained. The principle of the method is simple, but the travelling wave propagates in the GIL at a speed close to the speed of light, so that a positioning deviation of hundreds of meters can be caused by a very small time error, and the influence caused by dispersion and a GIL structure exists, so that the reliability of wave head identification and wave speed determination algorithms is not high.
Disclosure of Invention
In order to overcome the defects of the prior art in the aspects of monitoring data transmission and processing, the invention provides a GIL arc discharge fault positioning method, which comprises the following steps:
acquiring the sequence of the arrival of traveling wave signals representing the discharge fault at the two ends of the GIL through the installed traveling wave sensor to obtain the first fault area location; locating a fault range by the amplitude of the ultrasonic signal representing the discharge fault received by the plurality of ultrasonic sensors arranged at intervals along the line;
determining second fault area positioning according to the time difference between the ultrasonic signal received by the ultrasonic sensor at the starting point of the positioning fault range for the first time and the traveling wave signal received by the traveling wave sensor at one end of the GIL for the first time;
calculating the moving path of the traveling wave signal according to the propagation velocity empirical value of the traveling wave signal in the GIL and by combining the time difference of twice receiving the same traveling wave signal at one end of the GIL, and determining the location of a third fault area;
and comparing and analyzing the first fault area location, the second fault area location and the third fault area location, and comprehensively locating fault points. The distance calculation of the positioning method is to determine the ultrasonic walking distance through sound-electricity combination and then compare and analyze the distance with the result obtained through a traveling wave method, so that the configuration number of the ultrasonic sensors can be reduced by times, the defects of larger error and unreliability of the traveling wave method are avoided, the obtained result is substituted into an original model to carry out recursive operation, the empirical parameters related to measurement are continuously corrected, and the measurement reliability is further improved.
Preferably, the results of multiple times of comprehensive positioning are substituted into an algorithm of a third fault range to perform recursive operation, and a new traveling wave signal propagation speed empirical value in the GIL is reversely deduced for subsequent comprehensive positioning.
Preferably, the method further comprises the step of performing analog/digital conversion on the traveling wave signal before the first fault region is located after the installed traveling wave sensor receives the traveling wave signal representing the discharge fault; after the installed ultrasonic sensor receives the ultrasonic signal representing the discharge fault and before the second fault area is located, the method further comprises the following steps: and a step of analog/digital converting the ultrasonic signal.
Therefore, various analog parameters of the traveling wave signals can be converted into data variables which can be received and processed by the calculation module, and information collection, transmission and processing are facilitated.
Another aspect of the present invention provides a GIL arc discharge fault location system, comprising:
and the signal acquisition module consists of a traveling wave sensor, an ultrasonic sensor and a transmission device and is used for receiving traveling wave signals and ultrasonic signals of power generation faults. And acquiring the first fault area location by representing the sequence of the traveling wave signals of the discharge fault reaching the two ends of the GIL.
The fault area positioning module is composed of a timer, a memory, a processor and a circuit and is used for acquiring first fault area positioning according to the sequence of traveling wave signals representing discharge faults reaching two ends of the GIL; positioning a fault range through ultrasonic signals received by ultrasonic sensors arranged at intervals along the GIL equipment, and determining second fault area positioning according to the time difference between the ultrasonic signals received by the ultrasonic sensors at the starting point of the fault range and the traveling wave signals received by the traveling wave sensor at one end of the GIL for the first time; calculating the moving path of the traveling wave signal according to the propagation velocity empirical value of the traveling wave signal in the GIL and by combining the time difference of twice receiving the same traveling wave signal at one end of the GIL, and determining the location of a third fault area; and comparing and analyzing the ranges limited by the first fault area positioning, the second fault area positioning and the third fault area positioning to determine the comprehensive positioning of the fault point.
Preferably, the fault area positioning module is further configured to substitute the multiple results of the comprehensive positioning into the third fault positioning algorithm to perform a recursive operation, and inversely deduce an empirical value of propagation speed of a new traveling wave signal in the GIL for use in the comprehensive positioning again.
Preferably, the system further comprises a conversion module for performing analog/digital conversion on the traveling wave signal.
Preferably, the system further comprises a conversion module for performing analog/digital conversion on the ultrasonic signal.
Compared with the prior art, the invention has the following beneficial effects: the problems that a manual method consumes a large amount of manpower, the positioning accuracy is low, and the method cannot be used for long-term online monitoring are solved; the defects that an ultrasonic wave method is easy to misreport, more sensors are needed for sound-sound positioning, a traveling wave method is easy to be interfered by electromagnetic waves, the positioning reliability is poor and the like are overcome; the method is suitable for fault location and long-term online monitoring of the operation process of the short-time withstand voltage test of the GIL equipment; the positioning error is less than 1 meter, and the field requirement is met; the system composition is optimized, a single acquisition module array can monitor a plurality of GIL circuits, the using amount of ultrasonic sensors is greatly reduced, and the equipment cost and the installation and maintenance difficulty are reduced; the fault point can be quickly positioned by monitoring and analyzing the ultrasonic wave and the traveling wave signals generated by the arc discharge in the GIL.
Drawings
FIG. 1 is a flow chart of a fault location algorithm of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a signal acquisition module according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a fault area locating module according to an embodiment of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any new work, are within the scope of the present invention.
In the embodiment, a short-time strong arc discharge fault in the GIL is focused, a system comprising a signal acquisition module and a fault area positioning module is established, and a program implanted into the system is operated to implement the GIL arc discharge fault positioning method. The method comprises the following steps:
acquiring the sequence of the arrival of traveling wave signals representing the discharge fault at the two ends of the GIL through the installed traveling wave sensor to obtain the first fault area location; locating a fault range by the amplitude of the ultrasonic signal representing the discharge fault received by the plurality of ultrasonic sensors arranged at intervals along the line;
determining second fault area positioning according to the time difference between the ultrasonic signal received by the ultrasonic sensor at the starting point of the positioning fault range for the first time and the traveling wave signal received by the traveling wave sensor at one end of the GIL for the first time;
calculating the moving path of the traveling wave signal according to the propagation velocity empirical value of the traveling wave signal in the GIL and by combining the time difference of twice receiving the same traveling wave signal at one end of the GIL, and determining the location of a third fault area;
and comparing and analyzing the first fault area location, the second fault area location and the third fault area location, and comprehensively locating fault points.
The details are as follows:
the GIL arc discharge fault positioning method is suitable for devices with two structures of 10 kV-1100 kV voltage class GIL, three-phase common-cylinder and three-phase split-cylinder.
The traveling wave sensor and the ultrasonic sensor detect ultrasonic waves and traveling wave signals when the GIL has an arc fault;
the system also comprises an analog/digital conversion module which converts the ultrasonic wave signal and the traveling wave signal into digital signals;
according to fault recording information of the GIL or phase and fault time information of the arc discharge fault of the switch telemechanical;
filtering data signals received by the traveling wave sensor and the N ultrasonic sensors;
a broadband electromagnetic wave sensor and a broadband ultrasonic sensor are arranged in the direction of a field interference source, and environmental background noise is monitored;
the interference of environmental background noise on the traveling wave sensor and the ultrasonic sensor is filtered, and the detection precision of the signal waveform of the sensor is effectively improved;
acquiring the sequence of the arrival of traveling wave signals representing the discharge fault at the two ends of the GIL through the installed traveling wave sensor to obtain the first fault area location; positioning a fault range through the amplitude of an ultrasonic signal of a GIL representation discharge fault received by N ultrasonic sensors (N is determined according to the GIL equipment structure, and N is more than 2) which are arranged at intervals along the line;
if the traveling wave sensor does not detect the fault information, the failure of the single-end positioning of the traveling wave is indicated; otherwise, determining the first fault area location according to the sequence of the discharging traveling wave signals reaching the two ends of the GIL;
substituting the GIL propagation speed empirical value to perform traveling wave single-end positioning, and giving a positioning result b as third fault area positioning;
determining second fault area positioning according to the time difference between the ultrasonic signal received by the ultrasonic sensor at the starting point of the positioning fault range for the first time and the traveling wave signal received by the traveling wave sensor at one end of the GIL for the first time;
if M ultrasonic sensors detect the fault signal, if M is 0, the ultrasonic positioning is failed;
if M is 1, the fault area is preliminarily determined to be within P meters around the sensor (the length of P is determined according to the structure of the sensor accessory GIL, and usually P does not exceed 20);
if M is larger than 1, a plurality of arc discharge fault points are possible;
removing abnormal data through criteria such as amplitude variation trend, waveform analysis and the like, and arranging the remaining Q sensors from large to small according to the amplitude;
the left and right P m areas of the first 5 sensors are primary positioning areas;
and finally, according to the TOA of the triggering time of the arc fault discharge signal transmitted to the traveling wave sensor and the ultrasonic sensor, giving a positioning result a through sound-electricity positioning to be used as second fault area positioning.
The calculation formula of the single-end positioning by the traveling wave method is as follows:
wherein L represents the distance from the fault position to the end of the traveling wave sensor, and Tre1Denotes the time, T, at which the traveling wave signal is detected for the 1 st timere3And V represents the propagation speed of the GIL arc discharge fault traveling wave signal in the GIL equipment loop.
The calculation formula of the acoustic-electric positioning of the traveling wave sensor and the ultrasonic sensor is as follows:
L＝(TAE-Tre1)*VAEwherein L represents a distance T from a fault position to a position of the ultrasonic sensorAEDenotes the time when the ultrasonic signal is detected for the 1 st time, Tre1 denotes the time when the traveling wave signal is detected for the 1 st time, VAERepresenting the propagation velocity of the GIL arcing fault ultrasound in the GIL device loop.
And analyzing the first, second and third fault area positioning to comprehensively position the fault areas.
And the fault area positioning module is also used for reversely deducing the traveling wave signal propagation speed in the GIL according to the previous reliable positioning results of the loops of the GIL equipment, replacing the original propagation speed empirical value, obtaining the mutual verification of the optimized traveling wave method single-end positioning and the acoustic-electric positioning after the operation, and comprehensively positioning the fault area again, thereby further improving the reliability and the accuracy of the positioning.
Each set of signal acquisition module is communicated with the fault area positioning module through optical fibers or wireless signals.
The acquisition module is connected with mains supply through the isolation protection module and is provided with a lithium battery as a hot standby power supply.
The system can be used as a charged detection instrument for a short time and can also be used as an online monitoring system for a long time;
the isolation protection module comprises: the double-isolation transformer and the voltage-limiting and overcurrent protection circuit ensure that the system is not influenced by electromagnetic interference and ground potential counterattack at the moment of GIL arc discharge fault and works normally.
The signal acquisition module receives synchronous clock signals through a GPS, optical fibers or radio waves to realize synchronous acquisition of sensor signals.
The fault area positioning module has the functions of time-frequency analysis, waveform pattern recognition and the like, and effectively improves the recognition accuracy of fault positioning information.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computers, usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. 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 (8)
1. A GIL arc discharge fault locating method is characterized by comprising the following steps:
acquiring the sequence of the arrival of traveling wave signals representing the discharge fault at the two ends of the GIL through the installed traveling wave sensor to obtain the first fault area location; locating a fault range by the amplitude of the ultrasonic signal representing the discharge fault received by the plurality of ultrasonic sensors arranged at intervals along the line;
determining second fault area positioning according to the time difference between the ultrasonic signal received by the ultrasonic sensor at the starting point of the positioning fault range for the first time and the traveling wave signal received by the traveling wave sensor at one end of the GIL for the first time;
calculating the moving path of the traveling wave signal according to the propagation velocity empirical value of the traveling wave signal in the GIL and by combining the time difference of twice receiving the same traveling wave signal at one end of the GIL, and determining the location of a third fault area;
and comparing and analyzing the first fault area location, the second fault area location and the third fault area location, and comprehensively locating fault points.
2. The GIL arc discharge fault location method of claim 1, wherein after comprehensively locating the fault point, further comprising:
and substituting the results of the multiple times of comprehensive positioning into the third fault positioning algorithm to perform recursive operation, and reversely deducing a new traveling wave signal propagation speed empirical value in the GIL for the use of the comprehensive positioning again.
3. The GIL arc discharge fault location method of claim 1, wherein after the installed traveling wave sensor receives the traveling wave signal characterizing the discharge fault, and before obtaining the first fault region location, further comprising: and performing analog-to-digital conversion on the traveling wave signal.
4. The GIL arc discharge fault locating method of claim 1, wherein after the ultrasonic sensor is mounted to receive the ultrasonic signal indicative of the discharge fault and before locating the fault range, further comprising: and a step of analog/digital converting the ultrasonic signal.
5. A GIL arc discharge fault location system, comprising:
the acquisition module is used for receiving traveling wave signals representing the discharge faults through the installed traveling wave sensors and receiving ultrasonic signals representing the discharge faults through GILs (general information acquisition) received by the plurality of ultrasonic sensors arranged at intervals along the line;
the fault area positioning module is used for acquiring first fault area positioning according to the sequence of the traveling wave signals representing the discharge fault reaching the two ends of the GIL; positioning a fault range through ultrasonic amplitude signals received by ultrasonic sensors arranged at intervals along the GIL equipment, and determining second fault area positioning according to the time difference between the ultrasonic signals received by the ultrasonic sensors at the starting point of the positioned fault range for the first time and the traveling wave signals received by the traveling wave sensor at one end of the GIL for the first time; calculating the moving path of the traveling wave signal according to the propagation velocity empirical value of the traveling wave signal in the GIL and by combining the time difference of twice receiving the same traveling wave signal at one end of the GIL, and determining the location of a third fault area; and carrying out comparative analysis on the ranges limited by the first fault area positioning, the second fault area positioning and the third fault area positioning, and carrying out comprehensive positioning on fault points.
6. The GIL arc discharge fault location system of claim 5, wherein the fault region location module is further configured to substitute a result of the multiple times of comprehensive location into the third fault location algorithm for recursive operation, and inversely derive an empirical value of propagation velocity of a new traveling wave signal in the GIL for further comprehensive location.
7. The GIL arcing fault locating system of claim 5, further comprising a conversion module for analog-to-digital converting said traveling wave signal.
8. The GIL arc discharge fault location system of claim 5, further comprising a conversion module to analog/digital convert said ultrasonic signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114217189A (en) * | 2021-12-30 | 2022-03-22 | 国网江苏省电力有限公司南通供电分公司 | GIL equipment fault positioning method adopting ultrahigh frequency transient current measurement |
| CN116699339A (en) * | 2023-08-04 | 2023-09-05 | 武汉朗德电气有限公司 | GIL arc fault positioning method based on bimodal acoustic guided wave |
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| CN101702000A (en) * | 2009-11-26 | 2010-05-05 | 华北电力大学（保定） | Phased ultrasound locating method and system of partial discharge of transformer |
| US20130096854A1 (en) * | 2011-10-12 | 2013-04-18 | Schweitzer Engineering Laboratories, Inc. | Fault Location Using Traveling Waves |
| CN106443353A (en) * | 2016-10-26 | 2017-02-22 | 中国电力科学研究院 | Traveling wave based GIL discharge fault locating method and device |
| CN110716113A (en) * | 2019-11-21 | 2020-01-21 | 上海昌鹭智能技术有限公司 | GIL fault positioning system based on ultrasonic wave and earth electric wave technology |
| CN111426922A (en) * | 2020-04-29 | 2020-07-17 | 云南电网有限责任公司电力科学研究院 | GI L discharge fault positioning system and method based on steep slope |
| CN112904139A (en) * | 2020-10-10 | 2021-06-04 | 国网山东省电力公司枣庄供电公司 | High-voltage switch cabinet partial discharge positioning method and system considering temperature field change |
| CN113075519A (en) * | 2021-05-18 | 2021-07-06 | 武汉朗德电气有限公司 | Device for GIL partial discharge monitoring and arc fault positioning |
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| CN114217189A (en) * | 2021-12-30 | 2022-03-22 | 国网江苏省电力有限公司南通供电分公司 | GIL equipment fault positioning method adopting ultrahigh frequency transient current measurement |
| CN116699339A (en) * | 2023-08-04 | 2023-09-05 | 武汉朗德电气有限公司 | GIL arc fault positioning method based on bimodal acoustic guided wave |
| CN116699339B (en) * | 2023-08-04 | 2023-11-17 | 武汉朗德电气有限公司 | GIL arc fault positioning method based on bimodal acoustic guided wave |
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