CN113702778B - GIL arc discharge fault positioning method and system - Google Patents
GIL arc discharge fault positioning method and system Download PDFInfo
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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
- G01R31/1227—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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- 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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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 GIL arc discharge fault positioning system, wherein the GIL arc discharge fault positioning method comprises the following steps: the first fault area location and the third fault area location are respectively measured through a single-end traveling wave method and a double-end traveling wave method, the second fault area location is calculated through the time difference between the traveling wave and the ultrasonic signal reaching the corresponding detection points, the three location results are analyzed to obtain the comprehensive fault location, the traveling wave velocity propagated in the GIL is reversely deduced according to the comprehensive fault location, and the traveling wave velocity is substituted into the single-end traveling wave method to perform optimization operation so as to accurately and comprehensively locate the fault later. The invention also provides a GIL arc discharge fault positioning system, which comprises an ultrasonic sensor, a traveling wave sensor and a processing circuit with a calculation module, wherein the processing circuit can execute the method. The invention solves the problems of low accuracy and poor reliability of the positioning result of the traveling wave and more sensors required by the ultrasonic method, and realizes accurate and reliable positioning of the arc faults of the GIL equipment. The fault monitoring 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 a GIL arc discharge fault positioning system.
Background
GIL (Gas-insulated Transmission Lines), a Gas insulated transmission line, is a transmission apparatus employing compressed SF6 Gas (or mixed Gas insulation), with a housing coaxially arranged with a conductor. The GIL has the advantages of large transmission capacity, low unit loss, little influence from environment, high operation reliability, land occupation saving and the like, and has been widely used in the electric energy delivery occasions of hydropower stations and nuclear power stations for a long time.
Insulation defects can be generated in the GIL during various links such as manufacturing, transportation and field assembly, and arc breakdown faults are easy to occur in the GIL withstand voltage test or in daily operation. Because the GIL conveying capacity is large, once arc discharge occurs in the interior, if the fault position cannot be rapidly and accurately positioned and timely repaired, the electric energy conveying 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 the positioning method of arc discharge faults for GIS is generally consulted in practice, and mainly includes: manual monitoring, arc light method, ultrasonic method, traveling wave method, etc., wherein ultrasonic method and ultra-high frequency method are applied in engineering sites.
The manual monitoring mainly comprises the steps of pressurizing in a segmented and repeated mode and judging by means of human ear hearing, wherein a worker stands nearby at intervals in the field test process, and once breakdown occurs, the worker nearby can judge the approximate breakdown position through sound. The method is time-consuming and labor-consuming, is extremely easy to be influenced by the field environment and subjective factors of people, has large positioning error, and also needs multiple disassembly and pressurization tests, so that equipment can be damaged.
According to the arc light method, the discharge arc light is monitored, positioning is carried out according to discharge electromagnetic wave pulses, however, holes are formed in a shell, the original structure of the GIL is destroyed, meanwhile, an arc light signal generated by flashover is easily affected by a body structure, and the arc light signal is high in sensitivity but cannot be identified to early partial discharge signals.
The ultrasonic method monitors through ultrasonic signals generated by monitoring discharge, and determines the position of a fault point through monitoring and analyzing the amplitude or time delay of signals received by each microphone during fault, although the positioning reliability is high, and the external arrangement of the sensor does not influence the insulation, sealing performance and internal electric field distribution of the GIL body. But the sensor monitoring distance is short due to the large attenuation of the acoustic wave transmission.
The traveling wave method utilizes the steep wave sensors arranged at the two ends of each phase GIL to transmit signals to the side GPS synchronous unit, and calculates the time difference through the second pulse signals output by the GPS at the two ends, thereby obtaining the fault positioning result. The method is simple in principle, but the traveling wave propagates in the GIL at a speed of nearly light, a positioning deviation of hundreds of meters is caused by a very small time error, and influences caused by chromatic dispersion and the GIL structure exist, so that the reliability of the wave head identification and wave speed determination algorithm 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:
The method comprises the steps that the installed traveling wave sensor receives the sequence of arrival of traveling wave signals representing discharge faults at two ends of the GIL, and first fault area positioning is obtained; locating a fault range by amplitude of ultrasonic signals characterizing a discharge fault by GILs received by the plurality of ultrasonic sensors arranged at intervals along the line;
determining a second fault area to be positioned 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;
According to the travelling wave signal propagation speed empirical value at the GIL, combining the time difference of the same travelling wave signal received twice at one end of the GIL, calculating the travelling wave signal movement path, and determining a third fault area location;
And comparing and analyzing the first fault area positioning, the second fault area positioning and the third fault area positioning, and comprehensively positioning the fault points. The distance calculation of the positioning method is to measure the ultrasonic walking distance through the combination of sound and electricity and compare and analyze the ultrasonic walking distance with the result obtained through the traveling wave method, so that the configuration quantity of the ultrasonic sensor can be reduced by times, the defect that the error is large and unreliable by using the traveling wave method alone is avoided, and the obtained result is substituted into the original model to carry out recursion operation, so that the experience parameter related to measurement is continuously corrected, and the measurement reliability is further improved.
Preferably, the result of multiple comprehensive positioning is substituted into the algorithm of the third fault range to carry out recursive operation, and a new travelling 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 area is acquired and positioned 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, before the second fault region positioning is acquired, the method further comprises: and performing analog/digital conversion on 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 is to provide a GIL arc discharge fault location system, comprising:
the signal acquisition module is composed 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 positioning of the first fault region by representing the sequence of the traveling wave signals of the discharge faults 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 through the sequence of the traveling wave signals representing the discharge faults reaching the two ends of the GIL; positioning a fault range through ultrasonic signals received by ultrasonic sensors which are arranged at intervals along the GIL equipment, and determining a second fault area to position according to the time difference between the ultrasonic signals received by the ultrasonic sensors at the starting point of the positioning fault range and the traveling wave signals received by the traveling wave sensors at one end of the GIL for the first time; according to the travelling wave signal propagation speed empirical value at the GIL, combining the time difference of the same travelling wave signal received twice at one end of the GIL, calculating the travelling wave signal movement path, and determining a third fault area location; and comparing and analyzing the limited ranges of 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 result of the multiple comprehensive positioning into the third fault positioning algorithm to perform recursive operation, and reversely push out a new travelling wave signal propagation velocity empirical value in the GIL for use in comprehensive positioning again.
Preferably, the system further comprises a conversion module for performing an analog/digital conversion of the travelling 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 problem that the manual method needs to consume a large amount of manpower, has low positioning accuracy and cannot be used for long-term online monitoring is solved; the defects that the ultrasonic method is easy to report by mistake, the acoustic-acoustic positioning needs more sensors, the traveling wave method is easy to be subjected to electromagnetic interference, the positioning reliability is poor and the like are overcome; the fault positioning and running process long-term online monitoring method is suitable for short-time withstand voltage test fault positioning and running process long-term online monitoring of GIL equipment; the positioning error is less than 1 meter, so that the field requirement is met; the system is optimized, a single acquisition module array can monitor a plurality of GIL lines, so that the consumption of an ultrasonic sensor is greatly reduced, and the equipment cost and the installation and maintenance difficulty are reduced; the rapid positioning of fault points is realized by monitoring and analyzing ultrasonic and traveling wave signals generated by the arc discharge in the GIL.
Drawings
FIG. 1 is a flow chart of a fault localization algorithm of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a signal acquisition module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a fault area locating module according to an embodiment of the present invention;
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention, where the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are obtained by a person skilled in the art without innovative work, are intended to be within the scope of the invention.
The present embodiment focuses on the short-time intense arcing faults inside the GIL, and implements a GIL arcing fault locating method by creating a set of systems including a signal acquisition module and a fault area locating module, and by running a program implanted in the systems. The method comprises the following steps:
The method comprises the steps that the installed traveling wave sensor receives the sequence of arrival of traveling wave signals representing discharge faults at two ends of the GIL, and first fault area positioning is obtained; locating a fault range by amplitude of ultrasonic signals characterizing a discharge fault by GILs received by the plurality of ultrasonic sensors arranged at intervals along the line;
determining a second fault area to be positioned 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;
According to the travelling wave signal propagation speed empirical value at the GIL, combining the time difference of the same travelling wave signal received twice at one end of the GIL, calculating the travelling wave signal movement path, and determining a third fault area location;
and comparing and analyzing the first fault area positioning, the second fault area positioning and the third fault area positioning, and comprehensively positioning the fault points.
The details are as follows:
The GIL arc discharge fault positioning method is suitable for equipment with two structures of 10 kV-1100 kV voltage class GIL, three-phase common cylinder and three-phase split cylinder.
The travelling wave sensor and the ultrasonic wave sensor detect ultrasonic waves and travelling wave signals when the GIL has arc faults;
the system also comprises an analog/digital conversion module which converts the ultrasonic signal and the traveling wave signal into digital signals;
according to fault wave recording information of GIL or phase and fault time information of arc discharge fault of switch tele-motion;
Filtering data signals received by the traveling wave sensor and the N ultrasonic sensors;
A broadband electromagnetic wave sensor and a broadband ultrasonic wave sensor are arranged in the direction of the field interference source, and environmental background noise is monitored;
interference of environmental background noise to the traveling wave sensor and the ultrasonic sensor is filtered, and the detection precision of the sensor signal waveform is effectively improved;
The method comprises the steps that the installed traveling wave sensor receives the sequence of arrival of traveling wave signals representing discharge faults at two ends of the GIL, and first fault area positioning is obtained; locating a fault range by the amplitude of ultrasonic signals of the GIL characterization discharge fault received by N ultrasonic sensors (N is determined according to the GIL equipment structure and N is more than 2) arranged at intervals along the line;
if the traveling wave sensor does not detect the fault information, indicating that the traveling wave single-end positioning fails; otherwise, determining the first fault area positioning according to the sequence of the discharge traveling wave signals reaching the two ends of the GIL;
substituting GIL propagation velocity empirical values, performing traveling wave single-end positioning, and giving a positioning result b as a third fault area positioning;
determining a second fault area to be positioned 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, M=0 indicates that ultrasonic positioning fails;
If m=1, primarily determining the fault area to be within P meters of the sensor (P is a length determined according to the sensor accessory GIL structure, and typically P is not more than 20);
if M is greater than 1, a plurality of arc discharge fault points are possible;
Abnormal data is removed through criteria such as amplitude change trend, waveform analysis and the like, and the rest Q sensors are arranged from large to small according to the amplitude;
The left and right P meter areas of the first 5 sensors are preliminary positioning areas;
Finally, according to the TOA of the trigger time of the arc fault discharge signal transmitted to the traveling wave sensor and the ultrasonic sensor, a positioning result a is given out through sound-electricity positioning and is used as a 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 location to the end of the traveling wave sensor, T re1 represents the time when the traveling wave signal is detected 1 st time, T re3 represents the time when the traveling wave signal is detected 2 nd time, and V represents the propagation speed of the GIL arc discharge fault traveling wave signal in the GIL equipment loop.
The calculation formula of acoustic-electric positioning of the travelling wave sensor and the ultrasonic sensor is as follows:
L= (T AE-Tre1)*VAE, where L represents the distance T AE from the fault location to the location of the ultrasonic sensor, represents the 1 st time when the ultrasonic signal is detected, tre1 represents the 1 st time when the traveling wave signal is detected, and V AE represents the propagation speed of the GIL arc discharge fault ultrasonic wave in the GIL device loop.
And analyzing the first, second and third fault areas to locate, and comprehensively locating the fault areas.
The fault area positioning module is also used for reversely pushing the propagation speed of the traveling wave signal in the GIL according to the reliable positioning results of the former times of the GIL equipment loop, replacing the original propagation speed empirical value, obtaining the mutual verification of optimized traveling wave method single-end positioning and acoustic-electric positioning after operation, comprehensively positioning the fault area again, and further improving the reliability and accuracy of positioning.
Each set of signal acquisition module and the fault area positioning module are communicated through optical fibers or wireless signals.
The acquisition module is connected with a 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 an electrified detection instrument for short time and also can be used as an online monitoring system for long time;
the isolation protection module comprises: the double-isolation transformer, 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 faults and works normally.
The signal acquisition module receives the synchronous clock signal through GPS, optical fiber or radio wave, and realizes synchronous acquisition of sensor signals.
The fault area positioning module has the functions of time-frequency analysis, waveform mode recognition and the like, and the recognition accuracy of fault positioning information is effectively improved.
It will be appreciated by those skilled in the art that 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 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, and the like) 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. 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 positioning method is characterized by comprising the following steps:
The method comprises the steps that the installed traveling wave sensor receives the sequence of arrival of traveling wave signals representing discharge faults at two ends of the GIL, and first fault area positioning is obtained; locating a fault range by the amplitude of ultrasonic signals representing the discharge fault through GILs received by a plurality of ultrasonic sensors arranged at intervals along the line;
determining a second fault area to be positioned 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;
According to the travelling wave signal propagation speed empirical value at the GIL, combining the time difference of the same travelling wave signal received twice at one end of the GIL, calculating the travelling wave signal movement path, and determining a third fault area location;
and comparing and analyzing the first fault area positioning, the second fault area positioning and the third fault area positioning, and comprehensively positioning the fault points.
2. The GIL arc discharge fault location method of claim 1, further comprising, after comprehensively locating the fault point:
Substituting the result of the comprehensive positioning for a third fault positioning algorithm to carry out recursive operation, and reversely pushing out the empirical value of the propagation speed of the new traveling wave signal 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 indicative of the discharge fault, before acquiring the first fault region location, further comprising: and performing analog/digital conversion on the traveling wave signal.
4. The GIL arc discharge fault location method of claim 1, further comprising, after the installed ultrasonic sensor receives the ultrasonic signal indicative of the discharge fault, prior to locating the fault range: and performing analog/digital conversion on 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 installed traveling wave sensors and ultrasonic signals representing the discharge faults through GIL (gas insulated switchgear) received through a plurality of ultrasonic sensors arranged at intervals along the line;
The fault region positioning module is used for acquiring a first fault region positioning through the sequence of the traveling wave signals representing the discharge faults reaching the two ends of the GIL; positioning a fault range through ultrasonic amplitude signals received by ultrasonic sensors which are arranged at intervals along the GIL equipment, and determining a second fault area for positioning according to the time difference between the ultrasonic signals received by the ultrasonic sensors at the starting point of the positioning fault range and the traveling wave signals received by the traveling wave sensors at one end of the GIL for the first time; according to the travelling wave signal propagation speed empirical value at the GIL, combining the time difference of the same travelling wave signal received twice at one end of the GIL, calculating the travelling wave signal movement path, and determining a third fault area location; and comparing and analyzing the limited ranges of the first fault area positioning, the second fault area positioning and the third fault area positioning, and comprehensively positioning the fault points.
6. The GIL arc discharge fault location system of claim 5, wherein the fault region location module is further configured to apply the result of the integrated location to a third fault location algorithm to perform a recursive operation, and to reversely derive a new travelling wave signal propagation velocity empirical value in the GIL for use in the integrated location again.
7. The GIL arc discharge fault location system of claim 5, further comprising a conversion module for analog-to-digital conversion of the traveling wave signal.
8. The GIL arc discharge fault location system of claim 5, further comprising a conversion module to analog to digital convert the ultrasonic signal.
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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 |
| 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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