CN109709111B - Composite insulator ultra-wideband radio frequency sensing intelligent hardware and use method thereof - Google Patents
Composite insulator ultra-wideband radio frequency sensing intelligent hardware and use method thereof Download PDFInfo
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- CN109709111B CN109709111B CN201910143899.5A CN201910143899A CN109709111B CN 109709111 B CN109709111 B CN 109709111B CN 201910143899 A CN201910143899 A CN 201910143899A CN 109709111 B CN109709111 B CN 109709111B
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Abstract
The invention provides a composite insulator ultra-wideband radio frequency sensing intelligent hardware fitting and a using method thereof. The using method comprises the following steps: providing a first hardware fitting and a second hardware fitting which are respectively arranged at two ends of the composite insulator, wherein an ultra-wideband signal transmitter and four first radio frequency probes are arranged in the first hardware fitting, and an ultra-wideband signal receiver and four second radio frequency probes are arranged in the second hardware fitting; feeding the first RF probe by the UWB signal transmitter to excite HE11A mode radio frequency microwave; and finally, carrying out background analysis on the processed radio frequency microwave signal by the remote server to determine whether defects exist in the composite insulator. By adopting the using method provided by the invention, whether the defects exist in the composite insulator can be accurately diagnosed.
Description
Technical Field
The invention relates to the field of maintenance of operation states of power equipment, in particular to a composite insulator ultra wide band radio frequency sensing intelligent hardware fitting and a using method thereof.
Background
The composite insulator overcomes the defects of porcelain and glass insulators due to the advantages of light weight, high strength, strong pollution flashover resistance, convenience in manufacturing and maintenance and the like, and is more and more widely applied to power grids. Currently, the number of composite insulators used in national electrical networks is as high as several million, with the longest operating time exceeding twenty years. The main component of the composite insulator sheath is silicon rubber, when the composite insulator sheath is exposed to outdoor environment for a long time, the silicon rubber is subjected to physical and chemical actions such as sun, rain, high temperature, severe cold, sand erosion, acid erosion, strong electric field and the like, polymer chains of the silicon rubber are gradually decomposed, volatilized and the like, the performance of the silicon rubber is gradually reduced, and the composite insulator has the characteristics of pulverization, hardening, cracking, electric erosion damage, hydrophobic loss and the like, so that the pollution flashover resistance of the composite insulator is reduced and the insulation reliability is reduced along with the increase of the service life. Meanwhile, the composite insulator has the problems of reduced mechanical strength, looseness of hardware fittings, invasion of acid gas and the like in the process of non-standard operation or long-term operation, so that the core rod of the composite insulator falls off or is brittle. Therefore, in actual use, the composite insulator needs to be detected so as to ensure the safety and reliability of the use of the composite insulator.
At present, researchers at home and abroad carry out a great deal of research on the composite insulator detection technology, and the detection operation mode can be divided into a contact type and a non-contact type. The former includes a short circuit fork method or a spark gap method, a photoelectric detection rod method, an electric field measurement method, a pulse current method, a leakage current method, and the like; the latter includes ultraviolet imaging, infrared thermography, acoustic pulse method, laser doppler method, etc. The contact type detection operation needs to be carried out on site one by one, even the operation of climbing poles and towers has high labor intensity, low efficiency and high danger. The cracked composite insulator can be detected by a non-contact detection method such as a laser Doppler method, but the cracked composite insulator does not work, and the equipment is large in size and is not suitable for field operation; the acoustic pulse method has no major breakthrough in remote telemetry due to the problems of coupling, attenuation and performance of an ultrasonic transducer at present, is not suitable for operation field detection, and is mainly used for enterprise production online detection and laboratory identification; when the ultraviolet imaging method is used for detection, partial discharge of the insulator is required to occur, the detection is required to be performed in a normal temperature and high humidity environment, detection equipment is expensive, the function is single, and the detection result is easily influenced by an observation angle. The non-contact detection technology which is widely applied at present is a thermal infrared image detection method which can detect the local temperature rise of the insulator caused by local discharge, dielectric loss or resistance loss when leakage current flows through an insulating substance and the like, but the temperature is easily influenced by sunlight, strong wind, moisture, ambient temperature and some factors which can cause the surface temperature of the insulator to change rapidly; and the infrared thermography detection method has obvious effect on detecting the hidden defects of the composite insulator such as interface air gaps, internal cracks and the like, which is not the same as the effect on detecting the conductivity defects. The microwave in the radio frequency interval has strong penetrating power, and can effectively detect the internal fine cracks of the composite insulator, so that the research on the ultra-wideband radio frequency sensing intelligent hardware of the composite insulator is necessary.
Disclosure of Invention
In view of the above situation, the invention provides a composite insulator ultra-wideband radio frequency sensing intelligent hardware and a use method thereof, which can quickly diagnose whether defects exist in the composite insulator.
In order to achieve the purpose, the invention discloses a use method of a composite insulator ultra wide band radio frequency sensing intelligent hardware fitting, which comprises the following steps:
providing a first hardware fitting and a second hardware fitting which are respectively arranged at two ends of a composite insulator, wherein an ultra-wideband signal transmitter and four first radio frequency probes are arranged in the first hardware fitting, and an ultra-wideband signal receiver and four second radio frequency probes are arranged in the second hardware fitting;
feeding and exciting HE through different feeding modes of the ultra-wideband signal transmitter to the four first radio frequency probes11Mode radio frequency microwave, the HE11The radio frequency microwave of the mode is transmitted along the inside of the composite insulator;
collecting radio frequency microwave signals transmitted from the interior of the composite insulator through the four second radio frequency probes, and carrying out amplification, frequency mixing, detection and filtering processing on the radio frequency microwave signals by using the ultra-wideband signal receiver;
transmitting the processed radio frequency microwave signal to a far-end server through a communication module in the ultra-wideband signal receiver;
background analysis is carried out on the processed radio frequency microwave signals through the far-end server, and data post-processing algorithm is used for generating data corresponding to HE11TM of modal radio frequency microwaves01Mode microwave level, and according to TM01And (4) diagnosing whether the composite insulator has defects or not by the mode microwave level.
The invention has the beneficial effects that: the remote online detection of the composite insulator is realized; using HE11The penetrating power of the mode radio frequency microwave can effectively detect the defects of fine cracks and the like in the composite insulator, and the safe use of the composite insulator is ensured; compared with the contact detection in the prior art, the method greatly reduces the detection cost and difficulty and has better adaptability. Meanwhile, compared with non-contact detection methods such as an ultraviolet imaging method, an infrared thermal imaging method, an acoustic pulse method, a laser Doppler method and the like, the method has the advantages of high detection accuracy and low detection cost, and is not influenced by external environment factors.
The composite insulator ultra-wideband radio frequency sensing intelligent hardware tool is further improved in that in the step of collecting radio frequency microwave signals transmitted through the interior of the composite insulator through the four second radio frequency probes, time domain and frequency domain characteristic parameters of the radio frequency microwave signals are collected through the four second radio frequency probes. By collecting the time domain and frequency domain signals, the time domain and frequency domain signals are comprehensively analyzed, and the accuracy of the detection result is further ensured.
The invention further improves the ultra-wideband radio frequency sensing intelligent hardware fitting of the composite insulator, in the step of carrying out background analysis on the processed radio frequency microwave signal through the remote server, the influence of the structure and material factors of the composite insulator on radio frequency microwave transmission is corrected through a correction algorithm, and TM is obtained through processing01And (5) mode microwave signals are obtained, and diagnosis results are output by integrating the information of the defect database. The influence of the structure and material factors of the composite insulator on radio frequency microwave transmission is comprehensively considered, and the accuracy of a diagnosis result is better ensured.
The invention further improves the composite insulator ultra-wideband radio frequency sensing intelligent hardware fitting, wherein the first hardware fitting is arranged at the high-voltage end of the composite insulator, and the second hardware fitting is arranged at the grounding end of the composite insulator.
The invention also discloses an ultra-wideband radio frequency sensing intelligent hardware fitting of the composite insulator, which comprises a first hardware fitting and a second hardware fitting which are respectively arranged at two ends of the composite insulator, wherein a first cavity is formed at one end, close to a core rod of the composite insulator, in the first hardware fitting, a second cavity is formed at one end, close to the core rod of the composite insulator, in the second hardware fitting, four first radio frequency probes are fixedly arranged at one end, close to the core rod, of the first cavity, an ultra-wideband signal transmitter is embedded at one end, far away from the core rod, of the first cavity, four second radio frequency probes are fixedly arranged at one end, close to the core rod, of the second cavity, an ultra-wideband signal receiver is embedded at one end, far away from the core rod, of the second cavity, the ultra-wideband signal transmitter is connected to the first radio frequency probes through a first transmission cable, and the ultra-wideband signal receiver is connected to the second radio frequency probes through a, the ultra-wideband signal receiver comprises an amplification module, a frequency mixing module, a detection module, a filtering module and a communication module connected to a far-end server, wherein the four first radio-frequency probes and the four second radio-frequency probes are distributed in an array mode along the circumferential direction of the axis of the insulator mandrel respectively.
The composite insulator ultra-wideband radio frequency sensing intelligent hardware fitting is further improved in that the four first radio frequency probes comprise a first fixed end integrally connected to the first hardware fitting and a first exposed end arranged in the first cavity, the four second radio frequency probes comprise a second fixed end integrally connected to the second hardware fitting and a second exposed end arranged in the second cavity, the first transmission cable is embedded in the first hardware fitting, and the second transmission cable is embedded in the second hardware fitting.
The invention further improves the composite insulator ultra-wideband radio frequency sensing intelligent hardware fitting, wherein the first hardware fitting is installed at the high-voltage end of the composite insulator, and the second hardware fitting is installed at the grounding end of the composite insulator.
Drawings
Fig. 1 is a flow chart of a using method of the composite insulator ultra-wideband radio frequency sensing intelligent fitting.
Fig. 2 is a schematic structural diagram of the composite insulator ultra-wideband radio frequency sensing intelligent hardware fitting.
Detailed Description
To facilitate an understanding of the present invention, the following description is made in conjunction with the accompanying drawings and examples.
Referring to fig. 1, the invention discloses a use method of a composite insulator ultra-wideband radio frequency sensing intelligent hardware, which comprises the following steps:
step 101: providing a first hardware fitting 1 and a second hardware fitting 2 which are respectively arranged at two ends of the composite insulator, wherein an ultra-wideband signal transmitter 12 and four first radio frequency probes 13 are arranged in the first hardware fitting 1, and an ultra-wideband signal receiver 22 and four second radio frequency probes 23 are arranged in the second hardware fitting 2;
step 102: the HE is excited by different feeding modes of the ultra-wideband signal transmitter 12 to the four first radio frequency probes 1311Mode radio frequency microwave, HE11The radio frequency microwave of the mode is transmitted along the inside of the composite insulator;
step 103: radio frequency microwave signals transmitted from the inside of the composite insulator are collected through four second radio frequency probes 23, and the radio frequency microwave signals are amplified, mixed, detected and filtered by an ultra-wideband signal receiver 22;
step 104: transmitting the processed radio frequency microwave signal to a remote server through a communication module in the ultra-wideband signal receiver 22;
step 105: background analysis is carried out on the processed radio frequency microwave signal through a far-end server, and a data post-processing algorithm is used for generating a signal corresponding to HE11TM of modal radio frequency microwaves01Mode microwave level, and according to TM01And (4) diagnosing whether the composite insulator has defects or not by the mode microwave level.
In this example, (1) HE11The radio frequency microwave of the mode has stronger penetrability; (2) the composite insulator ultra-wideband radio frequency sensing intelligent hardware has the characteristics of an ultra-wideband antenna system and high sensitivity; (3) the radio frequency microwave signal is amplified through the amplifying module, so that the input impedance and the sensitivity are improved, and the problems of scale nonlinearity caused by the working of the detection circuit on small signals and zero drift of the amplifying module are avoided; detecting through a detection module to restore the amplitude of the received radio frequency microwave signal; filtering the detected signal through a filtering module, filtering out signals of non-detection frequency bands, and reducing the amount of transmitted information; the preliminarily processed radio frequency microwave signal is transmitted to a remote server through a communication module, so that the limitation of the application condition of wired transmission is avoided, the remote detection and analysis are realized, and the adaptability is better; (4) and (4) diagnosing specific defects of the composite insulator by integrating the information of the defect database, wherein the defects mainly comprise microcracks, air gaps, corrosion marks and the like in the composite insulator and at the interface. (5) When HE11When the mode radio frequency microwave penetrates through the early defect or microcrack, the mode radio frequency microwave can be considered to be transmitted in the material with non-uniform dielectric property distribution, and the mode radio frequency microwave generates refraction and reflection to enable the HE11Coupling of mode RF microwave and reception of corresponding TM01The mode microwave level rises, so that the defects such as microcracks in the composite insulator can be detected according to the principle, and the use safety of the composite insulator is further ensured. Specifically, the communication module is a 3G/4G communication module.
Further, in step 103, time domain and frequency domain characteristic parameters of the rf microwave signal are collected by four second rf probes 23. In this embodiment, the time domain and frequency domain signals are collected by the four second rf probes 23, so that the two parameters can be conveniently combined and analyzed in the later stage, and the accuracy of the diagnosis structure can be further ensured.
Further, in step 105, the influence of the structure and material factors of the composite insulator on the radio frequency microwave transmission is corrected through a correction algorithm, and the TM is obtained through processing01And (5) mode microwave signals are obtained, and diagnosis results are output by integrating the information of the defect database. In this embodiment, the factors such as the structure and material of the composite insulator are comprehensively consideredThe influence of elements on the transmission of radio-frequency microwaves ensures the TM produced01And (3) accurately detecting whether the composite insulator has defects and the specific types of the defects by the accuracy of the mode microwave level.
Further, the first hardware fitting 1 is installed at a high-voltage end of the composite insulator, and the second hardware fitting 2 is installed at a grounding end of the composite insulator. In this embodiment, the first hardware fitting 1 is installed at the high-voltage end of the composite insulator, so that power is supplied to the ultra-wideband signal transmitter 12, the length of a power supply line is reduced, and the use cost is reduced.
In the invention, a core rod 3 is arranged between a first hardware 1 and a second hardware 2, a first cavity 11 for installing an ultra-wideband signal transmitter 12 and four first radio frequency probes 13 is formed between the inside of the first hardware 1 and the end part of the core rod 3, and a second cavity 21 for installing an ultra-wideband signal receiver 22 and four second radio frequency probes 23 is formed between the inside of the second hardware 2 and the end part of the core rod 3. Specifically, the connection form between the core rod 3 and the first fitting 1 and the connection form between the core rod 3 and the second fitting 2 refer to the prior art, and detailed description is omitted in the present invention.
Referring to fig. 2, the invention also discloses a composite insulator ultra wide band radio frequency sensing intelligent hardware, which comprises a first hardware 1 and a second hardware 2 respectively arranged at two ends of the composite insulator, wherein a first cavity 11 is formed at one end of the first hardware 1 close to a core rod 3 of the composite insulator, a second cavity 21 is formed at one end of the second hardware 2 close to the core rod 3 of the composite insulator, four first radio frequency probes 13 are fixedly arranged at one end of the first cavity 11 close to the core rod 3, an ultra wide band signal transmitter 12 is embedded at one end of the first cavity 11 far away from the core rod 3, four second radio frequency probes 23 are fixedly arranged at one end of the second cavity 21 close to the core rod 3, an ultra wide band signal receiver 22 is embedded at one end of the second cavity 21 far away from the core rod 3, the ultra wide band signal transmitter 12 is connected to the four first radio frequency probes 13 through a first transmission cable 14, the ultra-wideband signal receiver 22 is connected to the four second rf probes 23 through a second transmission cable 24, and the ultra-wideband signal receiver 22 includes an amplifying module, a frequency mixing module, a detecting module, a filtering module, and an on-line connection to a far endAnd the communication module of the server, four first radio frequency probes 13 and four second radio frequency probes 23 are respectively distributed along the circumferential array of the axis of the insulator core rod. In this embodiment, the four first rf probes 13 are fed by the ultra-wideband signal transmitter 12 to excite rf microwaves (with the power being HE)11Mode rf microwave) that propagates along the inside of the composite insulator, and then the rf microwave signal propagating through the inside of the composite insulator is detected by four second rf probes 23. In the embodiment, a first hardware fitting 1 is installed at the high-voltage end of the composite insulator, and a second hardware fitting 2 is installed at the grounding end of the composite insulator; by adopting the intelligent hardware fitting in the embodiment, whether the composite insulator has defects or not can be rapidly and accurately detected. Specifically, (1) extension lines of four first radio frequency probes 13 intersect at a first point, extension lines of four second radio frequency probes 23 intersect at a second point, and a connecting line of the first point and the second point is collinear with an axis of the core rod 3; (2) the first cavity 11 comprises two first cavity units which are arranged at intervals and are respectively provided with an ultra-wideband signal transmitter 12 and four first radio frequency probes 13, and the second cavity 21 comprises two second cavity units which are arranged at intervals and are respectively provided with an ultra-wideband signal receiver 22 and four second radio frequency probes 23.
Further, the four first rf probes 13 include a first fixed end integrally connected to the first fitting 1 and a first exposed end disposed in the first cavity 11, the four second rf probes 23 include a second fixed end integrally connected to the second fitting 2 and a second exposed end disposed in the second cavity 21, the first transmission cable 14 is embedded in the first fitting 1, and the second transmission cable 24 is embedded in the second fitting 2. In this embodiment, the length of the first exposed end is smaller than the inner diameter of the first cavity 11, and the length of the second exposed end is smaller than the inner diameter of the second cavity 21; a first mounting hole for embedding the first transmission cable 14 is integrally formed in the first fitting 1, and a second mounting hole for embedding the second transmission cable 24 is integrally formed in the second fitting 2.
In the invention, the four first radio frequency probes 13 and the four second radio frequency probes 23 play the role of ultra-wideband antenna; the detailed structure and circuit connection relationship of the ultra-wideband signal transmitter 12 and the ultra-wideband signal receiver 22 are not described in detail in the present invention, and reference is made to the prior art.
The composite insulator ultra-wideband radio frequency sensing intelligent hardware fitting and the use method thereof have the beneficial effects that:
1. by adopting the intelligent hardware (comprising the first hardware and the second hardware) in the invention, small defects such as microcracks, air gaps, corrosion marks and the like in the composite insulator and at the interface can be quickly, accurately and remotely detected on line, and the problems of non-ideal detection effect and incomplete detection defect type of the composite insulator for a long time are solved.
2. The working strength and the safety risk coefficient of detection personnel are obviously reduced, the detection rate of the deteriorated composite insulator under the online monitoring condition is improved, and powerful guarantee is provided for the safe operation of a power grid.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
It should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the range covered by the technical contents disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.
Claims (7)
1. The utility model provides a use method of composite insulator ultra wide band radio frequency sensing intelligence gold utensil, provides first gold utensil and the second gold utensil of laying respectively at composite insulator both ends, its characterized in that includes following step:
an ultra-wideband signal transmitter and four first radio frequency probes are arranged in the first hardware fitting, and an ultra-wideband signal receiver and four second radio frequency probes are arranged in the second hardware fitting;
the HE is excited in different feeding modes of the ultra-wideband signal transmitter to the four first radio frequency probes11Mode radio frequency microwave, the HE11The radio frequency microwave of the mode is transmitted along the inside of the composite insulator;
collecting radio frequency microwave signals transmitted from the interior of the composite insulator through the four second radio frequency probes, and carrying out amplification, frequency mixing, detection and filtering processing on the radio frequency microwave signals by using the ultra-wideband signal receiver;
transmitting the processed radio frequency microwave signal to a far-end server through a communication module in the ultra-wideband signal receiver;
background analysis is carried out on the processed radio frequency microwave signals through the far-end server, and data post-processing algorithm is used for generating data corresponding to HE11TM of modal radio frequency microwaves01Mode microwave level, and according to TM01And (4) diagnosing whether the composite insulator has defects or not by the mode microwave level.
2. The use method of the composite insulator ultra-wideband radio frequency sensing intelligent fitting according to claim 1, characterized in that: in the step of collecting the radio frequency microwave signals transmitted from the inside of the composite insulator through the four second radio frequency probes, time domain and frequency domain characteristic parameters in the radio frequency microwave signals are collected through the four second radio frequency probes.
3. The use method of the composite insulator ultra-wideband radio frequency sensing intelligent fitting according to claim 1, characterized in that: in the step of carrying out background analysis on the processed radio frequency microwave signal through the remote server, the composite insulator is corrected through a correction algorithmThe influence of the structural and material factors on the radio frequency microwave transmission is processed to obtain the TM01And (5) mode microwave signals are obtained, and diagnosis results are output by integrating the information of the defect database.
4. The use method of the composite insulator ultra-wideband radio frequency sensing intelligent fitting according to claim 1, characterized in that: the first hardware fitting is installed at the high-voltage end of the composite insulator, and the second hardware fitting is installed at the grounding end of the composite insulator.
5. The intelligent hardware fitting adopting the use method of the composite insulator ultra-wideband radio frequency sensing intelligent hardware fitting according to claim 1 is respectively arranged on a first hardware fitting and a second hardware fitting at two ends of the composite insulator, and is characterized by comprising the following steps of: the ultra-wideband signal receiver is characterized in that a first cavity is formed in one end, close to a composite insulator, of a first hardware fitting, a second cavity is formed in one end, close to the composite insulator, of a second hardware fitting, four first radio frequency probes are fixedly arranged at one end, close to the composite insulator, of the first hardware fitting, an ultra-wideband signal transmitter is embedded in one end, close to the core rod, of the first cavity, four second radio frequency probes are fixedly arranged at one end, close to the core rod, of the second cavity, an ultra-wideband signal receiver is embedded in one end, far away from the core rod, of the second cavity and connected to the first radio frequency probes through a first transmission cable, and the ultra-wideband signal receiver is connected to the second radio frequency probes through a second transmission cable and comprises an amplification module, a frequency mixing module, a detection module, a frequency mixing module and a detection module, The four first radio frequency probes and the four second radio frequency probes are distributed in an array along the circumferential direction of the axis of the insulator mandrel respectively.
6. The smart fitting of claim 5, wherein: the four first radio frequency probes comprise a first fixed end and a first exposed end, the first fixed end is connected with the first exposed end in the first cavity, the four second radio frequency probes comprise a second fixed end and a second exposed end, the second fixed end is connected with the second exposed end in the second cavity, the first transmission cable is embedded in the first hardware, and the second transmission cable is embedded in the second hardware.
7. The smart fitting of claim 5, wherein: the high-voltage end of the composite insulator is provided with the first hardware fitting, and the grounding end of the composite insulator is provided with the second hardware fitting.
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