CN113655349A - Power transmission and transformation ultrahigh frequency partial discharge sensor and method thereof - Google Patents
Power transmission and transformation ultrahigh frequency partial discharge sensor and method thereof Download PDFInfo
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- CN113655349A CN113655349A CN202110920193.2A CN202110920193A CN113655349A CN 113655349 A CN113655349 A CN 113655349A CN 202110920193 A CN202110920193 A CN 202110920193A CN 113655349 A CN113655349 A CN 113655349A
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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
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- 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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Abstract
The invention discloses a power transmission and transformation ultrahigh frequency partial discharge sensor and a method thereof, wherein the power transmission and transformation ultrahigh frequency partial discharge sensor comprises a shell, an ultrahigh frequency electromagnetic wave acquisition antenna and a signal sampling microprocessor, wherein the ultrahigh frequency electromagnetic wave acquisition antenna and the signal sampling microprocessor are arranged in the shell; and a package cover for packaging the top of the shell; the ultrahigh frequency partial discharge sensor is high in integration level, reasonable in structure setting, high in sealing performance, various in installation mode, high in ultrahigh frequency signal receiving capacity, high in transmission signal, high in sensitivity and high in anti-interference capacity, meets various intelligent applications through reliable and flexible network transmission, realizes after-overhaul to advance diagnosis and active early warning of power grid side equipment operation and detection, and finally achieves automatic switching of a power supply network by utilizing the technology of internet of things, so that the purpose of self-healing is achieved.
Description
Technical Field
The invention relates to the technical field of power equipment sensors, in particular to a power transmission and transformation ultrahigh frequency partial discharge sensor and a method thereof.
Background
Along with the expansion of the scale of a power grid, the increase of equipment types and the complexity of monitoring, the demand for building sensing equipment of the Internet of things is particularly urgent. The power transformation equipment Internet of things is constructed, systems such as equipment identity recognition, electronic tag perception, environmental information monitoring and remote monitoring are built, the equipment state is mastered more clearly, the state change trend is more clear, and the overhaul management strategy is more scientific, so that defects and faults are found as soon as possible, the time consumed for problem processing is reduced, the safety and the stability of the operation of the power equipment are improved, the working efficiency of operation and maintenance of the power equipment is improved, and the conversion from after-overhaul to early diagnosis and active early warning of power grid side equipment operation and maintenance is realized.
The sensing equipment of the internet of things is an important basic support of the smart power grid, equipment sensing is realized through the power internet of things, the sensing units are miniaturized, the internet of things is decentralized, data transmission is wireless, and application analysis is intelligent, so that the sensing equipment plays an irreplaceable role in the future power grid. At present, the electric power internet of things still has the problems of relatively small coverage area, insufficient equipment coverage rate, high data fragmentation degree and the like, and has great influence on the usability and the data readability of the electric power internet of things. Meanwhile, the existing power internet of things technology has multiple systems, large network protocol difference and non-uniform interface specification. Due to the fact that technical systems are not uniform, an existing power internet of things sensing layer, a communication layer and a service layer cannot be effectively divided, interconnection and intercommunication cannot be achieved among existing internet of things sensing equipment systems, the situation of chimney standing is presented, and large-scale application of the power internet of things in the whole national power grid range cannot be supported.
The traditional operation mode depending on manual inspection has the disadvantages of huge workload, long detection period, low efficiency, incapability of effectively and timely finding defects, and high human input cost, and simple and repeated mechanical work such as meter reading, box opening inspection and the like occupies a large amount of time for operation and maintenance personnel. The construction of the power transmission and transformation on-line monitoring system is developed, the equipment state is known by adopting a remote monitoring means, but the construction is limited to the technology, the mechanism and other reasons, a complete system framework is not formed, the traditional on-line monitoring device has a huge and complicated structure, a heavy volume and huge power consumption, is greatly influenced by the electromagnetic environment, a transmission signal is not strong, a networking mode is not flexible, the maintenance workload is large, especially for +/-800 kV long distance, a large span, changeable climate, complex geology and application scenes with a large monitoring state quantity, the whole practical level of the traditional on-line monitoring system is not high, and the requirement is difficult to meet.
Disclosure of Invention
The invention provides a power transmission and transformation ultrahigh frequency partial discharge sensor and a method thereof, aiming at overcoming the defects of huge workload, high human operation and maintenance input cost and poor transmission effect in the traditional operation and inspection mode in the prior art. The power transmission and transformation ultrahigh-frequency partial discharge sensor and the method thereof have the characteristics of convenience and rapidness in installation, good transmission effect in a transportation and inspection mode and the like.
In order to achieve the purpose, the invention provides the following technical scheme: a power transmission and transformation ultrahigh frequency partial discharge sensor and a method thereof are provided, wherein the ultrahigh frequency partial discharge sensor comprises a shell, an ultrahigh frequency electromagnetic wave acquisition antenna and a signal sampling microprocessor which are arranged in the shell; and a package cover for packaging the top of the shell;
an ultrahigh frequency partial discharge detection circuit is arranged between the ultrahigh frequency electromagnetic wave acquisition antenna and the signal sampling microprocessor, the output end of the ultrahigh frequency electromagnetic wave acquisition antenna is electrically connected with the input end of the signal sampling microprocessor through the ultrahigh frequency partial discharge detection circuit, and the output end of the signal sampling microprocessor is connected with power transmission and transformation node equipment.
Preferably, the front wall of the shell is provided with a connector, the bottom of the shell is provided with an inwards concave part, and two ends of the concave part are integrally formed with mounting bases;
the mounting base is an insulator, a mounting hole is formed in the mounting base, at least four magnetic suction blocks are arranged below the mounting base, a bonding colloid layer is arranged on a connecting surface of each magnetic suction block, and the magnetic suction blocks are connected with the bottom of the mounting base through the bonding colloid layer;
a horizontal base station is arranged on the wall of the inner cavity of the shell, a partition plate is arranged on the base station, an irrigation cavity is arranged below the partition plate, the ultrahigh frequency electromagnetic wave acquisition antenna is arranged in the irrigation cavity, waterproof epoxy resin is poured into the irrigation cavity for filling, the ultrahigh frequency electromagnetic wave acquisition antenna is fixed in the shell, and a reserved hole is formed in the partition plate;
the top of the inner wall of the shell is annularly closed and annularly provided with a sealing gasket, and the packaging cover is connected with the shell in a sealing manner through the sealing gasket.
Based on the aforesaid, the sensor is put in superfrequency office wholly sets up on the casing, and holistic integrated level is high, and the structure sets up rationally, and the leakproofness is strong, and the mounting means is various, is convenient for install and fortune examine work.
Preferably, the shell and the packaging cover are both made of integrated packaging cast aluminum.
Based on the above, the shell structure has high strength and is little influenced by the environment.
Preferably, the ultrahigh frequency electromagnetic wave collecting antenna mainly comprises an insulator and a wire body, the insulator is arranged in a conical shape, the wire body is spirally wound on the outer wall of the insulator, the end part of the wire body penetrates through a reserved hole reserved on the partition board through a lead to be electrically connected with the interface, the winding distance of the wire body at the tip end of the insulator is smaller than that of the flat end, a positioning insertion block is fixedly installed in the center of the side wall of the flat end of the insulator, and an insertion groove matched with the positioning insertion block is formed in the inner cavity wall of the shell.
Based on the above, the whole structure of the ultrahigh frequency electromagnetic wave collecting antenna is reasonable in arrangement, strong in transmission signal, high in sensitivity, strong in anti-interference capability and stable in mounting structure.
Preferably, the bandwidth of the ultrahigh frequency electromagnetic wave collecting antenna is set to be 300-1500 MHz.
Based on the above, the ultrahigh frequency electromagnetic wave collecting antenna has reasonable bandwidth frequency setting and wide range.
Preferably, the power transmission and transformation node equipment is in signal connection with the power equipment internet of things, a wireless networking protocol of the power transmission and transformation equipment internet of things is adopted, and the power equipment internet of things comprises an access layer sensor system, a node system, an edge computing system and a platform layer background access system.
Based on the above, by adopting the power transmission and transformation equipment internet of things wireless networking protocol, each sensor corresponds to a unique ID number, and the corresponding sensor nodes are required to be added into the access node and the background before use.
Preferably, the ultrahigh frequency partial discharge sensor is connected to the power transmission and transformation node device through LoRa wireless communication.
Based on the above, the result of the collected ultrahigh frequency electromagnetic signal detection is compared with the partial discharge characteristic library, the partial discharge type is identified, calculation, analysis and comprehensive judgment are carried out according to the discharge data and the early warning trend, hidden dangers are eliminated before the insulation fault occurs in the power equipment, and the intelligent maintenance of the equipment is realized. The collected data comprises local discharge maximum value, minimum value, average value and power frequency period map data. The node is mainly responsible for simple calculation analysis and display of the edge side, and the data background is mainly used for calculating, storing and displaying big data.
Preferably, the ultrahigh frequency partial discharge detection circuit adopts an AD8313 detector and an OPA2365 operational amplifier, and the bandwidth is set to be 100-2500 MHz.
Based on the above, the multistage demodulation logarithmic amplifier can accurately convert the radio frequency signal into the equivalent decibel scale value at the output of the direct current at the input position, and the sensor signal is adjusted and amplified through the operational amplifier.
Preferably, integrated into one piece has the battery compartment on the casing outer wall lateral wall, it is right to install the inferior battery of lithium in the battery compartment the power supply and the electric quantity that the sensor was put in the superfrequency office detect AD and adopt the processing.
Based on the above, the charge-discharge cycle efficiency is high, the battery loss is small, the continuous work of the battery is ensured, and the battery operation time is improved.
Preferably, the method comprises the following steps:
the method comprises the following steps: carrying out magnetic attraction type or bracket type installation on the ultrahigh frequency partial discharge sensor through an installation base; the magnetic suction type is characterized in that a magnetic suction block with magnetic force is fixedly adhered to the bottom of the mounting base through an adhesive colloid layer and is adsorbed on the surface of the power equipment, the ultrahigh frequency partial discharge sensor is fixed in the switch cabinet through a screw by utilizing a mounting hole in the mounting base, the bracket type is suitable for GIS mounting, a concave part at the bottom of the shell is matched with a convex pipeline, and the ultrahigh frequency partial discharge sensor is fixed on the pipeline through another bracket;
step two: the interface is connected with a cable and is connected with the ultrahigh frequency electromagnetic wave acquisition antenna, and the ultrahigh frequency electromagnetic wave acquisition antenna acquires ultrahigh frequency electromagnetic wave signals;
step three: the ultrahigh frequency electromagnetic wave acquisition antenna transmits the sampled signal to a signal sampling microprocessor, and the signal sampling microprocessor is accessed and transmitted to power transmission and transformation node equipment through LoRa wireless communication;
step four: the power transmission and transformation node equipment compares the detection result of the collected ultrahigh frequency electromagnetic signals with the partial discharge feature library, performs partial discharge type identification, carries out edge calculation, preliminarily judges the state quantity according to a threshold value, realizes autonomous and rapid sensing and early warning of the equipment state, carries out calculation analysis comprehensive judgment through discharge data and early warning trend, and timely pushes early warning information to operators for abnormal equipment.
Based on the above, the result of the collected ultrahigh frequency electromagnetic signal detection is compared with the partial discharge characteristic library, the partial discharge type is identified, calculation, analysis and comprehensive judgment are carried out according to the discharge data and the early warning trend, hidden dangers are eliminated before the insulation fault occurs in the power equipment, and the intelligent maintenance of the equipment is realized. The collected data comprises local discharge maximum value, minimum value, average value and power frequency period map data. The node is mainly responsible for simple calculation analysis and display of the edge side, and the data background is mainly used for calculating, storing and displaying big data.
Compared with the prior art, the invention has the beneficial effects that:
1. the ultrahigh frequency partial discharge sensor is high in integral degree, reasonable in structural arrangement, strong in sealing performance and various in installation modes, is convenient to install and transport and examine in the using process, and can improve the equipment state control force and the transport and examination management penetrating power;
2. the ultrahigh frequency electromagnetic wave acquisition antenna has high sensitivity and high ultrahigh frequency signal receiving capacity, the overall structure of the ultrahigh frequency electromagnetic wave acquisition antenna is reasonable, the transmission signal is high, the sensitivity is high, the anti-interference capacity is high, and the mounting structure is stable.
3. The system has the advantages that various power equipment forms a huge power wide area network which is connected with each other through reliable and flexible network transmission and meets various intelligent applications, a panoramic holographic power internet of things which covers all links of power transmission, power transformation and power distribution and has unified information models, unified communication protocols, unified data services and unified application services is finally formed, the states of the equipment in all the links of a power grid can be measured, visualized and controlled, the equipment on the side of the power grid is examined and repaired from the back to the prior diagnosis and the active early warning, the automatic switching of the power supply network is finally realized by utilizing the technology of the internet of things, and the purpose of self-healing is achieved.
Drawings
Fig. 1 is an exploded view of the overall structure of the uhf partial discharge sensor according to the present invention;
fig. 2 is a schematic view of a modular structure of the uhf partial discharge sensor according to the present invention;
FIG. 3 is a block diagram of an edge calculation analysis system of the UHF partial discharge sensor according to the present invention;
FIG. 4 is a flow chart of the operation of the UHF partial discharge sensor according to the present invention;
fig. 5 is a block diagram of an entire system of a power transmission and transformation node device of the ultrahigh frequency partial discharge sensor according to the present invention;
FIG. 6 is a schematic structural diagram of an UHF electromagnetic wave collecting antenna according to the present invention;
fig. 7 is a schematic diagram of an external structure of the uhf partial discharge sensor according to the present invention;
fig. 8 is a structural composition diagram of the internet of things of the power equipment of the invention;
reference numbers in the figures: 1. a housing; 1a, a recess; 101. installing a base; 102. a magnetic block; 1021. bonding a colloid layer; 103. a battery compartment; 104. an interface; 105. a base station; 106. a gasket; 107. a watering chamber; 2. an ultrahigh frequency electromagnetic wave collecting antenna; 201. an insulator; 202. a wire body; 203. positioning the insert block; 3. a package cover; 4. a partition plate; 401. reserving a hole; 5. a signal sampling microprocessor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The current situation is as follows: the traditional operation mode depending on manual inspection has huge workload, long detection period and low efficiency; defects cannot be found effectively and timely; the human input cost is high, and a large amount of time is occupied by operation and maintenance personnel through simple and repeated mechanical work such as meter reading, box opening inspection and the like; the traditional online monitoring device has a complex structure, a heavy volume and huge power consumption; the method is greatly influenced by electromagnetic environment, the networking mode is inflexible, and the maintenance workload is large.
Referring to fig. 1-8, the present invention provides a technical solution: the ultrahigh frequency partial discharge sensor comprises a shell 1, an ultrahigh frequency electromagnetic wave acquisition antenna 2 and a signal sampling microprocessor 5, wherein the ultrahigh frequency electromagnetic wave acquisition antenna 2 and the signal sampling microprocessor 5 are arranged in the shell 1; and a packing cover 3 packing the top of the case 1; the shell 1 and the packaging cover 3 are both made of integrated packaging cast aluminum materials, and the shell 1 is high in structural strength and small in environmental influence; an ultrahigh frequency partial discharge detection circuit is arranged between the ultrahigh frequency electromagnetic wave acquisition antenna 2 and the signal sampling microprocessor 5, the output end of the ultrahigh frequency electromagnetic wave acquisition antenna 2 is electrically connected with the input end of the signal sampling microprocessor 5 through the ultrahigh frequency partial discharge detection circuit, and the output end of the signal sampling microprocessor 5 is connected with power transmission and transformation node equipment. The battery compartment 103 is integrally formed on the side wall of the outer wall of the shell 1, the lithium rechargeable battery is installed in the battery compartment 103 to supply power to the ultrahigh frequency partial discharge sensor and detect the electric quantity AD, the processing is adopted, the charge-discharge cycle efficiency is high, the battery loss is small, the long-time continuous work of the battery is guaranteed, and the service life is prolonged.
Preferably, the ultrahigh frequency partial discharge detection circuit adopts an AD8313 detector and an OPA2365 operational amplifier, the bandwidth is set to be 100-2500 MHz, the multistage demodulation logarithmic amplifier can accurately convert a radio frequency signal into an equivalent decibel scale value at a direct current output at an input position, and the sensor signal is adjusted and amplified through the operational amplifier.
Preferably, the signal sampling microprocessor 5 performs signal sampling processing, and the industrial-grade wide temperature chip can normally operate in a severe environment of-40 to 85 ℃, adopts ARM Cortex-M4, detects the ultrahigh frequency electromagnetic signal according to a set sampling period, and uploads data including ultrahigh frequency amplitude data, a time domain waveform diagram, a PRPS (pulse repetition phase diagram) and a PRPD (pulse repetition phase diagram). And then transmitting by using the LoRa wireless communication technology. And transmitting data to the terminal power transmission and transformation node equipment through a 470MHz wireless receiving and transmitting SX1268 chip.
Based on the aforesaid, the sensor is put in superfrequency office wholly integrated to be set up on casing 1, holistic integrated level is high, and the structure sets up rationally, and the leakproofness is strong, and the mounting means is various, is convenient for install and fortune examine work. The state control force and the operation and inspection management penetrating power of the equipment can be improved, the sensing equipment of the internet of things takes the intelligent power grid as the comprehensive application field of the power internet of things technology, the pattern of innovation drive, application lead and collaborative development is constructed, the comprehensive on-line collection of power production site, operation and control data is realized,
further, referring to fig. 1 and 7, a connector 104 is disposed on the front wall of the housing 1, a concave recess 1a is disposed at the bottom of the housing 1, and mounting bases 101 are integrally formed at two ends of the concave recess 1 a; the installation base 101 is an insulator, an installation hole is formed in the installation base 101, at least four magnetic suction blocks 102 are arranged below the installation base 101, an adhesive colloid layer 1021 is arranged on a connection surface of each magnetic suction block 102, and the magnetic suction blocks 102 are connected with the bottom of the installation base 101 through the adhesive colloid layer 1021; and then can realize that the ultrahigh frequency partial discharge sensor's magnetism inhales two kinds of mounting means of formula or posture, can be applicable to the installation of GIS and cubical switchboard. The first magnetic type is characterized in that the base with magnetic force is adsorbed on the surface of the power equipment, the ultrahigh frequency partial discharge sensor is fixed on the base through screws, and the mounting mode is suitable for a switch cabinet. The support is fixed on the pipeline, the ultrahigh frequency partial discharge sensor is fixed on the support by using screws, and the mounting mode is suitable for the GIS.
Referring to fig. 1 and 6, a horizontal base 105 is arranged on the inner cavity wall of the housing 1, a partition plate 4 is mounted on the base 105, a pouring cavity 107 is arranged below the partition plate 4, the ultrahigh frequency electromagnetic wave collecting antenna 2 is arranged in the pouring cavity 107, waterproof epoxy resin is poured into the pouring cavity 107 for filling, the ultrahigh frequency electromagnetic wave collecting antenna 2 is fixed in the housing 1, and a reserved hole 401 is formed in the partition plate 4; a sealing gasket 106 is annularly and closely arranged on the top of the inner wall of the shell 1, and the packaging cover 3 is hermetically connected with the shell 1 through the sealing gasket 106.
Specifically, the ultrahigh frequency electromagnetic wave collecting antenna 2 mainly comprises an insulator 201 and a wire body 202, the insulator 201 is arranged in a conical shape, the wire body 202 is spirally wound on the outer wall of the insulator 201, the end part of the wire body passes through a reserved hole 401 reserved on the partition plate 4 through a lead and is electrically connected with the interface 104, the winding distance of the wire body 202 at the tip end of the insulator 201 is smaller than the distance of the flat end, a positioning insertion block 203 is fixedly mounted in the center of the side wall of the flat end of the insulator 201, an insertion groove matched with the positioning insertion block 203 is formed in the inner cavity wall of the shell 1, preferably, the bandwidth of the ultrahigh frequency electromagnetic wave collecting antenna 2 is set to be 300-1500 MHz, the bandwidth frequency of the ultrahigh frequency electromagnetic wave collecting antenna 2 is reasonably set, and the range is wide. The ultrahigh frequency electromagnetic wave collecting antenna 2 is used for receiving partial discharge signals inside the GIS, the positioning plug block 203 fixes the ultrahigh frequency electromagnetic wave collecting antenna 2 in the pouring cavity 107 in the shell 1, and waterproof epoxy resin is poured in the pouring cavity 107 for filling so as to fix the ultrahigh frequency electromagnetic wave collecting antenna 2 in the metal shell 1. The installation and positioning are convenient, the whole structure is stable, the strength is high, the conical insulator 201 and the wire body 202 are spirally wound, the signal receiving strength can be improved, and the anti-interference capability is high.
It should be noted that the diameter of the wire body 202 and the number of the metal coils wound on the insulator 201 both affect the signal receiving capability of the signal coupling antenna, and therefore, the diameter of the metal wire and the number of the metal coils wound on the insulator 201 can be set according to specific situations.
In conclusion, it can be seen that the ultrahigh frequency electromagnetic wave collecting antenna 2 has high sensitivity and strong ultrahigh frequency signal receiving capability, and the ultrahigh frequency electromagnetic wave collecting antenna 2 has reasonable overall structure setting, strong transmission signal, high sensitivity, strong anti-interference capability and stable installation structure.
Referring to fig. 1-5, the power transmission and transformation node device is in signal connection with the power equipment internet of things, the signal connection adopts a power transmission and transformation equipment internet of things wireless networking protocol, the power equipment internet of things comprises an access layer sensor system, a node system, an edge computing system and a platform layer background access system, the power transmission and transformation equipment internet of things wireless networking protocol is adopted, each sensor corresponds to a unique ID number, and the corresponding sensor node needs to be added into the access node and the background before use.
The overall architecture of the power equipment internet of things of the power transmission and transformation node equipment comprises the following components: the system comprises an access layer sensor system, a node system, an edge computing system and a platform layer background access system. The access layer sensor system consists of a sensor and node (including edge proxy) equipment, wherein the sensor is arranged by a wireless low-power consumption sensor and a wireless micropower sensor, is a core level of an Internet of things architecture and is a key for realizing equipment state acquisition. The system covers various aspects of wireless communication, data transmission, sensors and the like, and is the basis for realizing interconnection of the Internet of things system. The node system is provided with node equipment, the node equipment transfers data to the edge agent, the edge frame or the side APP converts the sensor data format into JSON format data meeting the requirement of the pipe platform, and then the MQTT protocol or the UDP protocol is adopted to realize the data interaction between the edge Internet of things agent and the background access system.
When the power transmission and transformation node equipment is used, the detection result of the collected ultrahigh frequency electromagnetic signals is compared with the partial discharge characteristic library, partial discharge type identification is carried out, calculation analysis comprehensive judgment is carried out according to discharge data and early warning trend, hidden dangers are eliminated before insulation faults occur to the power equipment, and intelligent maintenance of the equipment is achieved. The collected data comprises local discharge maximum value, minimum value, average value and power frequency period map data. The node is mainly responsible for simple calculation analysis and display of the edge side, and the data background is mainly used for calculating, storing and displaying big data.
Meanwhile, when the system is applied, the application scene is used for sensing the state of the substation main equipment. Uploading equipment operation information such as current and voltage and equipment abnormal alarm signals in a station, and monitoring sensors such as an ultrahigh frequency partial discharge sensor, a high frequency current sensor, an ultrasonic partial discharge sensor, a lightning arrester leakage current sensor, an SF6 micro-water sensor and a temperature sensor on line to realize the omnibearing real-time sensing of the state of the power transformation equipment; application scenarios are also state-aware of e.g. the substation operating environment. The method has the advantages that the data of the sensors of the transformer substation, such as microclimate, noise, smoke, temperature and humidity, cable trench water level water immersion, SF6 gas and the like, are collected and analyzed, the sensing of the operating environment state of the transformer substation is realized, and the early warning of the safety operation risk in the substation is pushed in time.
When the ultrahigh frequency partial discharge sensor is used for installation, the ultrahigh frequency partial discharge sensor is installed in a magnetic absorption type or bracket type mode through the installation base 101; magnetism is inhaled the formula, will have magnetic force magnetism inhale piece 102 and fix the bottom at installation base 101 and adsorb in the power equipment surface through bonding colloid layer 1021 bonding, recycle the mounting hole on the installation base 101 and put the sensor with the superfrequency office and pass through the fix with screw in cubical switchboard, the posture is applicable to the GIS installation, with the depressed part 1a and the convex pipeline cooperation of casing 1 bottom, another will support the superfrequency office and put the sensor and be fixed in on the pipeline with the rethread.
When the ultrahigh frequency electromagnetic wave signal acquisition device is used, the interface 104 is connected with a cable and is connected with the ultrahigh frequency electromagnetic wave acquisition antenna 2, and the ultrahigh frequency electromagnetic wave acquisition antenna 2 acquires ultrahigh frequency electromagnetic wave signals; the ultrahigh frequency electromagnetic wave acquisition antenna 2 transmits the sampled signals to the signal sampling microprocessor 5, and the signal sampling microprocessor 5 is accessed and transmitted to the power transmission and transformation node equipment through LoRa wireless communication; as shown in fig. 3, the power transmission and transformation node device compares the detection result of the collected ultrahigh frequency electromagnetic signal with the partial discharge feature library, performs partial discharge type identification, performs edge calculation, preliminarily judges the state quantity according to a threshold value, realizes autonomous and rapid sensing and early warning of the device state, performs calculation, analysis and comprehensive judgment according to the discharge data and the early warning trend, and timely pushes early warning information to an operator for abnormal devices.
The collected ultrahigh frequency electromagnetic signal detection result is compared with the partial discharge characteristic library, partial discharge type identification is carried out, calculation analysis comprehensive judgment is carried out through discharge data and early warning trend, hidden danger is eliminated before insulation faults occur to power equipment, and intelligent maintenance of the equipment is achieved. The collected data comprises local discharge maximum value, minimum value, average value and power frequency period map data. The node is mainly responsible for simple calculation analysis and display of the edge side, and the data background is mainly used for calculating, storing and displaying big data.
The ultrahigh frequency partial discharge sensor is high in integral degree, reasonable in structural arrangement, strong in sealing performance, various in installation mode, convenient to install and transport and examine in the using process, capable of improving the equipment state control force and the transport and examination management penetrating power, high in sensitivity of the ultrahigh frequency electromagnetic wave acquisition antenna, strong in ultrahigh frequency signal receiving capacity, reasonable in integral structural arrangement of the ultrahigh frequency electromagnetic wave acquisition antenna, strong in transmission signal, high in sensitivity, strong in anti-interference capacity and stable in installation structure. The system has the advantages that various power equipment forms a huge power wide area network which is connected with each other through reliable and flexible network transmission and meets various intelligent applications, a panoramic holographic power internet of things which covers all links of power transmission, power transformation and power distribution and has unified information models, unified communication protocols, unified data services and unified application services is finally formed, the states of the equipment in all the links of a power grid can be measured, visualized and controlled, the equipment on the side of the power grid is examined and repaired from the back to the early diagnosis and the active early warning, the automatic switching of the power supply network is finally realized by utilizing the technology of the internet of things, and the purpose of self-healing is achieved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a sensor is put in transmission and transformation superfrequency office which characterized in that:
the ultrahigh frequency partial discharge sensor comprises a shell (1), an ultrahigh frequency electromagnetic wave collecting antenna (2) and a signal sampling microprocessor (5), wherein the ultrahigh frequency electromagnetic wave collecting antenna is arranged in the shell (1); and a packaging cover (3) for packaging the top of the shell (1);
an ultrahigh frequency partial discharge detection circuit is arranged between the ultrahigh frequency electromagnetic wave acquisition antenna (2) and the signal sampling microprocessor (5), the output end of the ultrahigh frequency electromagnetic wave acquisition antenna (2) is electrically connected with the input end of the signal sampling microprocessor (5) through the ultrahigh frequency partial discharge detection circuit, and the output end of the signal sampling microprocessor (5) is connected with power transmission and transformation node equipment.
2. The electric transmission and transformation ultrahigh frequency partial discharge sensor according to claim 1, characterized in that: an interface (104) is formed in the front wall of the shell (1), an inwards concave part (1 a) is formed in the bottom of the shell (1), and mounting bases (101) are integrally formed at two ends of the concave part (1 a);
the mounting base (101) is an insulator, a mounting hole is formed in the mounting base (101), at least four magnetic suction blocks (102) are arranged below the mounting base (101), a bonding colloid layer (1021) is arranged on the connecting surface of each magnetic suction block (102), and the magnetic suction blocks (102) are connected with the bottom of the mounting base (101) through the bonding colloid layer (1021);
a horizontal base station (105) is arranged on the wall of an inner cavity of the shell (1), a partition plate (4) is mounted on the base station (105), a pouring cavity (107) is arranged below the partition plate (4), the ultrahigh frequency electromagnetic wave collecting antenna (2) is arranged in the pouring cavity (107), waterproof epoxy resin is poured in the pouring cavity (107) for filling, the ultrahigh frequency electromagnetic wave collecting antenna (2) is fixed in the shell (1), and a reserved hole (401) is formed in the partition plate (4);
the top of the inner wall of the shell (1) is annularly closed and annularly provided with a sealing gasket (106), and the packaging cover (3) is hermetically connected with the shell (1) through the sealing gasket (106).
3. The power transmission and transformation ultrahigh frequency partial discharge sensor according to claim 2, characterized in that: the shell (1) and the packaging cover (3) are both made of integrated packaging cast aluminum materials.
4. The electric transmission and transformation ultrahigh frequency partial discharge sensor according to claim 1, characterized in that: the ultrahigh frequency electromagnetic wave collecting antenna (2) mainly comprises an insulator (201) and a wire body (202), wherein the insulator (201) is arranged in a conical shape, the wire body (202) is wound on the outer wall of the insulator (201) in a spiral shape, the end part of the wire body passes through a preformed hole (401) reserved on the partition plate (4) through a lead to be electrically connected with the interface (104), the winding distance of the wire body (202) at the tip end of the insulator (201) is smaller than that of a flat end, a positioning plug block (203) is fixedly installed in the center of the side wall of the flat end of the insulator (201), and a slot matched with the positioning plug block (203) is formed in the wall of an inner cavity of the shell (1).
5. The power transmission and transformation ultrahigh frequency partial discharge sensor according to claim 4, characterized in that: the bandwidth of the ultrahigh frequency electromagnetic wave collecting antenna (2) is set to be 300-1500 MHz.
6. The electric transmission and transformation ultrahigh frequency partial discharge sensor according to claim 1, characterized in that: the power transmission and transformation node equipment is in signal connection with the power equipment Internet of things, a wireless networking protocol of the power transmission and transformation equipment Internet of things is adopted, and the power equipment Internet of things comprises an access layer sensor system, a node system, an edge computing system and a platform layer background access system.
7. The power transmission and transformation ultrahigh frequency partial discharge sensor according to claim 6, characterized in that: the ultrahigh frequency partial discharge sensor is accessed to the power transmission and transformation node equipment through LoRa wireless communication.
8. The electric transmission and transformation ultrahigh frequency partial discharge sensor according to claim 1, characterized in that: the ultrahigh frequency partial discharge detection circuit adopts an AD8313 detector and an OPA2365 operational amplifier, and the bandwidth is set to be 100-2500 MHz.
9. The electric transmission and transformation ultrahigh frequency partial discharge sensor according to claim 1 or 2, characterized in that: integrated into one piece has battery compartment (103) on casing (1) outer wall lateral wall, it is right to install the inferior battery of lithium in battery compartment (103) the power supply and the electric quantity that sensor was put in superfrequency office detect AD and adopt the processing.
10. The use method of the power transmission and transformation ultrahigh frequency partial discharge sensor according to any one of claims 1 to 8, characterized by comprising the following steps:
the method comprises the following steps: carrying out magnetic attraction type or bracket type installation on the ultrahigh frequency partial discharge sensor through an installation base (101); the magnetic suction type is characterized in that a magnetic suction block (102) with magnetic force is fixedly bonded at the bottom of an installation base (101) through a bonding colloid layer (1021) and is adsorbed on the surface of power equipment, an ultrahigh frequency partial discharge sensor is fixed in a switch cabinet through screws by utilizing an installation hole in the installation base (101), a bracket type is suitable for GIS installation, a concave part (1 a) at the bottom of a shell (1) is matched with a convex pipeline, and the ultrahigh frequency partial discharge sensor is fixed on the pipeline through another bracket;
step two: the interface (104) is connected with a cable and is connected with the ultrahigh frequency electromagnetic wave acquisition antenna (2), and the ultrahigh frequency electromagnetic wave acquisition antenna (2) acquires ultrahigh frequency electromagnetic wave signals;
step three: the ultrahigh frequency electromagnetic wave acquisition antenna (2) transmits the sampled signals to the signal sampling microprocessor (5), and the signal sampling microprocessor (5) is accessed and transmitted to the power transmission and transformation node equipment through LoRa wireless communication;
step four: the power transmission and transformation node equipment compares the detection result of the collected ultrahigh frequency electromagnetic signals with the partial discharge feature library, performs partial discharge type identification, carries out edge calculation, preliminarily judges the state quantity according to a threshold value, realizes autonomous and rapid sensing and early warning of the equipment state, carries out calculation analysis comprehensive judgment through discharge data and early warning trend, and timely pushes early warning information to operators for abnormal equipment.
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