CN102288879A - Ultrasonic detection device for partial discharge of switchgear based on wireless network - Google Patents
Ultrasonic detection device for partial discharge of switchgear based on wireless network Download PDFInfo
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Abstract
The invention relates to ultrasonic detection for partial discharge, and provides a device capable of monitoring changing states of the partial discharge level at any time so as to describe characteristics of partial discharge from a plurality of perspectives. In the technical scheme, a sensor node on the switchgear and a coordinator node form a monitoring network of a tree-type topologic structure through a relay router arranged outside the switchgear; wherein the sensor node comprises an ultrasonic senor, an analog front-end filtration and amplification circuit, an A/D (analog-digital) converter, a sensor node microcontroller MCU module and a sensor node wireless radio-frequency module connected sequentially; and the coordinator node comprises a coordinator wireless radio-frequency module, a coordinator microcontroller MCU module and a coordinator GPRS (general packet radio service) module connected sequentially, wherein the coordinator GPRS module communicates with a GPRS module of a remote monitoring center. The device is mainly applied in ultrasonic detection of discharge.
Description
Technical field
The present invention relates to the shelf depreciation Ultrasonic Detection, specifically relate to switch cubicle shelf depreciation supersonic detection device based on wireless network.
Background technology
Electric power is the most important technical foundation of production development and social change, along with China's rapid development of economy, power industry, power supply and electricity consumption enterprise automation are built and transform in continuous development perfect, the electric pressure of power equipment is also improving constantly, and people have proposed harsh more requirement to the power equipment operational reliability.
Switch cubicle is a very important electrical equipment in the electric system, and modern power systems is more and more higher to the requirement of the quality of power supply, correspondingly the reliability of switch cubicle is also had higher requirement.The running status of switch cubicle has significant impact to the reliability of electric system.Switch cubicle breaks down, and it is impaired directly to endanger circuit, the equipment protected by electric equipment, electric quantity loss; Indirect harm then is to cause user's large-area power-cuts.Be the reliability of guaranteeing to power, power department takes the way of routine test and maintenance to guarantee that switch cubicle normally moves.Yet prophylactic repair has increased the operating cost and the power off time of power equipment, has increased breakdown rate even, and still has fault to take place at the interval of maintenance.Therefore, press for switch cubicle is carried out repair based on condition of component, equipment operation condition is carried out in real time and on-line monitoring regularly, degradation according to equipment running status and insulation, determine repair time and measure, reduce the generation of power off time and accident, improve the safe reliability and the automaticity of Operation of Electric Systems.Simultaneously,, make the running status of switch cubicle carried out on-line monitoring that in time finding potential faults and accumulative total property fault made prediction becomes possibility along with the development of sensor technology, signal processing technology, computer technology, artificial intelligence technology.
Carry out repair based on condition of component equipment is carried out online detection, must analyze the type characteristic of fault, thus the project of definite monitoring.Because switch cubicle is the combination of a plurality of electrical equipments, its inside relates to multiple physical phenomenons such as electricity, magnetic, temperature, the form of expression and the mechanism of production of fault vary, therefore to carry out on-line monitoring and make fault judgement and even failure prediction more accurately switch cubicle, must understand the operating characteristic and the fault characteristic of switch cubicle.Switch cubicle has the diversity of element, state and the randomness and the ambiguity of fault.The diversity of element has caused the diversity of failure mode, has a plurality of electrical equipments in the switch cubicle, and different elements has different fault performances.For example, for bus, it is excessive that its fault shows as the contact resistance of junction, thereby cause unusual intensification; For insulated tension pole, its fault shows as decreasing insulating.The diversity of failure mode has brought difficulty for the selection of sensor, and selected type of sensor, performance, quantity and installation position will be directly connected to the confidence level of diagnosis.The diversity of switch cabinet state is meant that in different application scenarios, the duty of switch cubicle has very big difference.For example for isolating switch wherein, some isolating switch needs frequent the connection and disjunction, the then action hardly after putting into operation of some isolating switch; Some will repeatedly cut-off short-circuit current in life span, what have then once all need not cut-off.Otherness on this duty has brought difficulty for the on-line monitoring and the fault diagnosis of isolating switch.For example,, can know the ruuning situation of breaker operation mechanism by the stroke curve of moving contact of breaker, if but after isolating switch puts into operation, do not carry out disjunction for a long time and close and close action, then can't obtain stroke curve.Exist between the state variable that randomness that the switch cubicle fault takes place and ambiguity are reflected in switch cubicle and the fault signature variable and become Nonlinear Mapping when complicated and concern: the fault of electrical equipment not only depends on the current state of equipment, also the historic state with it has relation, promptly may cause by incoherent multiple reason, and may cause different faults with a kind of reason with a kind of fault; For same state parameter, fault may take place also may not take place, and the order of severity of fault also has difference.
Take all factors into consideration the above-mentioned operating characteristic and the fault characteristic of switch cubicle, the project of the main monitoring of switch cabinet state maintenance has temperature monitoring, electric quantity monitoring, vibration monitoring, shelf depreciation (PD-Partial Discgarge) monitoring etc.Temperature monitoring wherein, electric weight detect and vibration monitoring has application to develop into, the more comprehensive stage of function ratio.Since the fifties, launched number of research projects around the partial discharge monitoring technology abroad, successfully multiple technologies have been applied in the Partial Discharge Detection of transformer, they are neutral point coupling monitoring, rf monitoring, PDA monitoring etc.And the domestic research that is placed on aspect the line monitoring in office starts late, and develops also slower.Though much more existing up till now cover partial discharge monitoring systems come into operation, theory is very imperfection, a difficult problem that much needs to be resolved hurrily in addition still.
The loose contact that the defective of switch cubicle built-in electrical insulation part or deterioration, conductive connection part divide all can make safe operation be on the hazard.According to national electric system 6～10kV switch cubicle accident statistics in the period of 1989～1992, the fault that insulation and current-carrying cause accounts for 40.2% of sum, and wherein the accident that causes owing to the flashover of insulated part accounts for 79.0% of insulation fault sum.And because the accident that the stab contact loose contact causes accounts for 71.1% of current-carrying total number of accident.As seen, the shared ratio of fault that is caused by insulation and loose contact is very high, should take suitable method to monitor.In these cases, a lot of insulation defects are in progressively development, the final dielectric breakdown that forms, the phenomenon that latent period all can occur continuous development of shelf depreciation and enhancing in accident, so by on-line monitoring to switch cubicle PD signal, carry out fault diagnosis, significant to the generation and the realization repair based on condition of component that prevent accident.Say that technically the partial discharge monitoring system of present domestic development can be divided into arrowband and broadband system.Narrowband systems is only played a game, and to put serious spark discharge of later stage relatively more responsive, and can not distinguish the source of discharge signal.It is abundant more that information is put in the office of the wide more collection of broadband system, bandwidth, but also high more to the requirement of system: require to have higher sampling rate and digital place ability on the one hand, the discriminating of Gan Raoing also is a key on the other hand.Monitoring system is put in existing office, no matter adopts any method, can not realize that all office accurately locatees in the source of putting in the switch cubicle.Existing measurement of partial discharge and evaluation criteria be just to the net assessment of electrical equipment, and it is very big that the position influence of source in equipment put in its measured value office of being subjected to.Only put under the condition of position in known office, apparatus insulated net assessment just has higher confidence level and actual value, thus office to put the accurate location in source extremely important, the research of partial discharge positioning method is had important scientific meaning and practical value.
At present, office's localization method of putting the source mainly contains electrical Location method, ultrasonic locating method and rf ultrasound's ripple co-located method.These methods all have certain advantage, but in theory still can't solve the multipoint positioning problem.
In addition, localization method is put in existing office, no matter is the electrical Location method, or ultrasonic locating method and rf ultrasound's ripple co-located method, and the signal that all needs each sensor is provided transfers to data processing centre (DPC) by corresponding wire cable.Use this wired sensor to have many shortcomings: 1. because the monitoring that needs to locate in the switch cubicle is counted more, a plurality of sensors need be installed in switch cubicle, a large amount of cables are drawn very difficulty, have not only increased wiring cost, also might cause the switch cubicle insulation damages; 2. As time goes on, the operative sensor in the switch cubicle inevitably can take place aging or break down, and this can cause the loss of monitoring parameter; 3. after general monitoring system has designed, increase, adjust relatively difficulty of sensor, the change of sensor configuration might need to revise the system software source program.These drawbacks limit of wired sensor the development of switch cabinet state monitoring.
Summary of the invention
For overcoming the deficiencies in the prior art, a kind of switch cubicle shelf depreciation supersonic detection device based on wireless network is provided, it is by online ultrasound wave Partial Discharge Detection, can monitor the variable condition of the interior local discharging level of switch cubicle of operation at any time, and by wireless network transmissions to host computer, and then the device of switch cubicle local discharge characteristic is described from a plurality of angles.For reaching above-mentioned purpose, the technical scheme that the present invention takes is, based on the switch cubicle shelf depreciation supersonic detection device of wireless network, structure is: relay router and the coordinator node of sensor node outside being placed on switch cubicle that is installed on the switch cubicle constitutes monitoring network with the tree topology structure; Sensor node is made of sonac, AFE (analog front end) filter amplification circuit, A/D converter, sensor node micro controller MCU module and sensor node wireless radio frequency modules, sonac is gathered the ultrasonic signal that generates when in the switch cubicle shelf depreciation taking place and is sent to sensor node micro controller MCU module through AFE (analog front end) filter amplification circuit, A/D converter, and sensor node micro controller MCU module and sensor node wireless radio frequency modules constitute sensor node ZigBee module; Coordinator node is made of the telegon wireless radio frequency modules, telegon micro controller MCU module and the telegon GPRS module that link to each other successively, and telegon wireless radio frequency modules and telegon micro controller MCU module constitute coordinator node ZigBee module; Telegon GPRS module intercoms mutually with remote monitoring center GPRS module, and remote monitoring center GPRS module links to each other with the remote monitoring center computing machine by serial ports.
The AFE (analog front end) filter amplification circuit is by being that the three grades of filter amplification circuit of core and the multiplication of voltage current stabilization circuit of diode are formed with the operational amplifier, the output that three grades of filter amplification circuit are every grade is connected to the inverting input of next stage operational amplifier, inverting input from first order operational amplifier is imported, and the afterbody filter amplification circuit is exported through the multiplication of voltage current stabilization circuit.
The present invention has following technique effect
(1) sonac directly is placed on the switch board housing of ground connection, solves that used transducer sensitivity in the present partial discharge monitoring is low, the shortcoming of serious interference; Can settle numerous sensor on switch board housing, and these sensors are formed network, each sensor node cooperates with each other and finishes multipoint data acquisition task jointly, realizes the partial discharge monitoring and the locating information acquisition of multi-section position in the switch cubicle.
(2) adopt wireless transmission method between sonac and the processing terminal, and good isolation is arranged between the high voltage installation, the safety of equipment and survey crew can be guaranteed; Simultaneously, do not exist in toe-in fruit and off-line result's equivalence problem.
(3) wireless sensor network node allows certain failure rate, in case sensor failure is arranged, network is networking again automatically, thereby monitoring system can be worked incessantly.
(4) network node has certain computing power and storage capacity.Can carry out pre-service to data, this is that the traditional sensors network can't be realized.Can reduce data quantity transmitted on the one hand, save node energy, prolong network life; On the other hand, the data volume that is transferred to data processing centre (DPC) significantly reduces.
(5) part of nodes of network can move, and topological structure has dynamic.Because sensor node switches between work and sleep state, perhaps the operative sensor node moves, and sensor node may lose efficacy owing to a variety of causes breaks down at any time, these make that all the topologies change of wireless sensor network is very fast, and wireless sensor network can adapt to this dynamic of network topology structure by agreement.
(6) upper computer analyzing software of independent research is powerful, comprises database and analysis module, can consult historical information and analyze local discharge characteristic from all angles, the row mode of going forward side by side identification.
(7) fully digitalization shows that the interface is more directly perceived, succinct, complete function.
Description of drawings
Fig. 1 is AFE (analog front end) filter amplification circuit figure of the present invention.
Fig. 2 is a schematic diagram of the present invention.
Embodiment
In order to overcome the above-mentioned shortcoming of existing switch cubicle Partial Discharge Detecting Technology, the invention provides a kind of switch cubicle shelf depreciation ultrasonic testing system based on wireless network, promptly utilize sonac and wireless sensor network technology thereof, shelf depreciation in the switch cubicle is carried out on-line monitoring and location.The technical problem to be solved in the present invention and target are as follows:
Can produce ultrasound wave when (1) shelf depreciation takes place, because ultrasound examination has highly sensitive and the strong characteristics of antijamming capability, research to supersonic testing method is quite popular, but all be that sonac is placed the position of device external away from Partial Discharge Sources generally, ultrasound wave is decayed, distorts serious in the route of transmission, makes it actually to use.Therefore, at first must study the feature of shelf depreciation ultrasonic signal and the propagation characteristic in switch cubicle thereof, determine the characteristic quantity of shelf depreciation ultrasonic Detection Method, to determine placement location and the transport property and the performance parameter of sonac.
(2) separation, filtering method and the hardware configuration thereof of the shelf depreciation information that collects of research realize monitoring node information pre-service and Characteristic Extraction.
(3) in the wireless sensor network, obtaining of node distribution and network topology is the effective way that improves network performance, and be significant for the perception and the viability that improve network.Therefore, need set up wireless sensor network node distribution optimization algorithm model, the network topology that acquired character is good.
(4) where sensor node must clear and definite self-position just can be described in detail in or particular event has taken place in the zone, therefore to study the recognition methods of wireless sensor network node, and node and mapping of locus, monitoring point or alignment methods, realize switch cubicle shelf depreciation source location.
The technical solution adopted for the present invention to solve the technical problems is: a kind of switch cubicle shelf depreciation ultrasonic testing system based on wireless network, be that detection system is put in a kind of wireless office based on emerging ZigBee technology, and utilize ripe GPRS network to realize real-time, the dynamic monitoring of switch cubicle shelf depreciation.The invention is characterized in that it is made up of ZigBee wireless sensor network, GPRS network and Surveillance center's three parts.
ZigBee be one group emerging that develop based on IEEE 802.15.4 wireless standard, about the technology of networking, safety and application software aspect.In ZigBee agreement 5 layer architectures, be positioned at the group of task definition of the Physical layer of bottom and MAC layer by IEEE802.15.4; ZigBee alliance has defined the data of network layer, safe floor, application layer and various application products.Compare with other wireless communication technologys, that ZigBee has is reliable, low in energy consumption, time delay is short, cost is low, network capacity is big, safety, working frequency range flexibly and exempt from advantage such as license.The ZigBee technology had closely, the characteristics of low complex degree, low-power consumption, low data rate, be particularly suitable for control and remote control field automatically, can be embedded into easily in the various device, support geographic positioning functionality simultaneously.The equipment that has defined two types in the ZigBee network be full-function device (Full Function Device, FFD) and simplify function device (Reduced Function Device, RFD).RFD equipment can only send and received signal, does not transmit and routing function.And FFD equipment has forwarding and routing function.According to different application demands, ZigBee can provide point-to-point connection, star network, tree network, 4 kinds of wireless network topology structures of mesh network.Wherein, point-to-point (Point-To-Point) connects and many times is called as wireless bridge, and a point-to-point connection can be replaced a communication cable.(Star Network) is simple in structure for star network, each ZigBee star network all is made up of a plurality of nodes, have a server (FDF/coordinator) and several client (RFD) in numerous nodes at least, client has the function of the different division of labor: Client with server in network be to send request, receives then and reply; The function of server is to accept request, and sends a reply then.Tree network (Cluster-Tree Network) has just appearred in further expanding of star network, because the increase of number of nodes, an independent star network possibly can't cover all nodes, so the common situation about existing of several star networks occurred, connect by router (Router) node between each star network, several star networks that are connected have constituted tree network.In ZigBee tree topology structure, three kinds of network topology nodes are arranged, they are respectively: sensor node RFD, router node Router, coordinator node Coordinator.Compare with star network, the tree structure network has more a Router node.Some sensor node owing to too far away apart from coordinator node, has exceeded the wireless coverage of coordinator node, and these sensor nodes of reason owing to distance can't be connected with coordinator node like this.The function of router node solves above-mentioned these problems exactly, router node is between sensor node and coordinator node, play the effect of relaying, can join indirectly in the telegon network by the mode that adds router node from the remote sensor node that can't add the telegon network of coordinator node distance.With respect to star network, the physical extent that tree network covers is bigger, and the network child node quantity of holding is more.In the network topology structure of wireless sensor network, complicated topological structure also is that final goal is mesh network (Mesh Network), in this structure, structure between node and the node is " point-to-point-to-point " structure, perhaps is called as the peer-to-peer system.
GPRS is the abbreviation of general packet radio service (General Packet Radio Service), be a kind of packet-switched data carrying and the transmission mode that on GSM global system for mobile communications network foundation, grows up, in embedded system, use very extensive.Along with reaching its maturity of China Mobile's GPRS network construction, the coverage rate in area surpasses 90%, and the GPRS signal has reached the non-blind area covering basically.GPRS belongs to packet-switch technology, has real-time online, charges by flow, fast lands, the transfer rate height, supports IP agreement and characteristics such as agreement X.25.
Among the present invention, the ZigBee wireless sensor network is to be installed in sensor node on the switch cubicle, to be placed on the outer router node of switch cubicle and coordinator node constitutes monitoring network with the tree topology structure.Wherein, sensor node is made up of sonac, AFE (analog front end) filter amplification circuit, micro controller (MCU) module and wireless radio frequency modules etc., and whole node does not have other energy recharges by battery-powered in whole work period; Coordinator node comprises less radio-frequency, micro controller and GPRS module, and power supply is a mains-supplied.
Sonac and AFE (analog front end) filter amplification circuit constitute the ultrasonic measurement module.Wherein, sonac is chosen the piezoelectric type water proof type sonac 40RS/UT180 that centre frequency is 40kHz, utilizes the selecting frequency characteristic of sensor itself can reduce the complexity of circuit.AFE (analog front end) filtering amplification module is that the three grades of filter amplification circuit of core and the multiplication of voltage current stabilization circuit of diode etc. are formed by the MC3403 operational amplifier of producing with TI company, signal is amplified and Filtering Processing, to reduce because the error that exists the air borne medium to cause serious interface decay to be brought, and the interference of resisting various neighbourhood noises.
Micro controller (MCU) module and wireless radio frequency modules constitute the ZigBee module.Take all factors into consideration factors such as volume, power consumption, cost, hardware and software development be simple and convenient, the ZigBee module adopts the system-level radio transceiver chip nRF9E5 that Nordic VLSI company released in 2004 in sensor node and the coordinator node, and its composition mainly contains built-in 8051 compatible microcontrollers (MCU), nRF905 433/868/915MHz radio-frequency (RF) transceiver and a four-way A/D converter.8051 compatible in nRF9E5 chip micro controller are enough deposited the protocol stack of ZigBee and are moved simple application program, can support the wireless radio frequency modules of high real-time well; It can be connected with a plurality of ultrasonic measurement modules by A/D converter, and the switch cubicle that the scene is moved carries out the data acquisition of multiple spot ultrasonic signal, improves data accuracy.NRF9E5 uses the ShockBurst technology, carries out high-speed data transmission, and the agreement relevant with rf data handled automatically by the nRF905 transceiver in the sheet.NRF9E5 utilizes SPI interface and nRF905 transceiver to carry out data transmission, and the power of data transmission, speed etc. can be by the configurations of SPI interface programming, and its wireless data transmission speed can reach 100kbps, maximum communication distance 500m.That nRF9E5 has is low in energy consumption, communication distance far away, compatible good, data transmission stability advantages of higher.
The present invention utilizes sonac 40RS/UT180 to be attached on the switch board housing of ground connection and detects, in when, in the switch cubicle shelf depreciation taking place when, sonac is gathered the ultrasonic signal in the environment, and being translated into electric signal, the echoed signal of handling well through the AFE (analog front end) filter amplification circuit is delivered to substation nRF9E5 again.In the nRF9E5 of substation, the electric signal that receives at first carries out the analog to digital conversion sampling via A/D converter, thereby obtains the ultrasonic signal amount in the detected environment; Discern processing by the MCU module again, and be converted into corresponding digital signal, and with its with test in the signal numerical value of actual measurement compare, to demarcate the actual strength of the ultrasonic signal that collects in the environment; Afterwards, nRF905 433/868/915MHz radio-frequency (RF) transceiver is wirelessly transmitted to relay router with the digital signal that collects.Substation nRF9E5 mainly is responsible for control and gathers ultrasonic shelf depreciation data, and carries out the control command that radio communication is uploaded data or received main website by relay router and the nRF9E5 of main website.Relay router is sent to the nRF9E5 of main website with data wireless.In the nRF9E5 of main website, at first receive the ultrasonic shelf depreciation data of switch cubicle of substation nRF9E5 timing acquiring by the nRF905 radio-frequency (RF) transceiver, discern processing by the MCU module again.The nRF9E5 of main website links to each other with the GPRS module by the RS-232 serial ports, be responsible for switch cubicle in ultrasonic shelf depreciation system set up data transmission channel, generally receive the ultrasonic shelf depreciation data of switch cubicle of substation nRF9E5 timing acquiring and transfer to the GPRS module, the GPRS module links to each other with Surveillance center by the RS-232 serial ports, by GPRS network data is sent to remote monitoring center; Surveillance center also can use active mode to send ultrasonic shelf depreciation acquisition to the GPRS module on the other hand, passes to the substation nRF9E5 of ultrasonic shelf depreciation acquisition system then under the nRF9E5 of main website.Surveillance center provides the ultrasonic partial discharge monitoring of switch cubicle, the analysis software based on the VB exploitation, software is integrated data configuration, data acquisition, data monitoring and back-stage management function.Data transmission is to Surveillance center, by analysis, statistical computation goes out the characteristic quantity of shelf depreciation, distinguish the characteristic of shelf depreciation: the PHASE DISTRIBUTION figure that draws the partial discharge quantity of the different local discharge characteristics of multiple expression respectively, the discharge capacity distribution plan, the PHASE DISTRIBUTION figure of discharge time and their temporal variations, the row mode of going forward side by side identification.
Further describe the present invention below in conjunction with accompanying drawing.
As shown in Figure 2, fundamental purpose of the present invention is by online ultrasound wave Partial Discharge Detection, realize detecting in real time the state variation of local discharging level in the switch cubicle that moves, describe the switch cubicle local discharge characteristic, the dielectric properties of research switch cubicle built-in electrical insulation part from a plurality of angles.Purpose of the present invention can reach by following measure: a kind of switch cubicle shelf depreciation ultrasonic testing system based on wireless network is provided, be that detection system is put in a kind of wireless office based on emerging ZigBee technology, and utilize ripe GPRS network to realize real-time, the dynamic monitoring of switch cubicle shelf depreciation.The invention is characterized in that it is made up of ZigBee wireless sensor network, GPRS network and Surveillance center's three parts.
The ZigBee wireless sensor network is to be installed in sensor node on the switch cubicle, to be placed on the outer router node of switch cubicle and coordinator node constitutes monitoring network with the tree topology structure.Wherein, sensor node is made up of sonac, AFE (analog front end) filter amplification circuit, micro controller (MCU) module and wireless radio frequency modules etc., and whole node does not have other energy recharges by battery-powered in whole work period; Coordinator node comprises less radio-frequency, micro controller and GPRS module, and power supply is a mains-supplied.
Sonac and AFE (analog front end) filter amplification circuit constitute the ultrasonic measurement module.Wherein, sonac is chosen the piezoelectric type water proof type sonac 40RS/UT180 that centre frequency is 40kHz, utilizes the selecting frequency characteristic of sensor itself can reduce the complexity of circuit.The AFE (analog front end) filter amplification circuit is that the three grades of filter amplification circuit of core and the multiplication of voltage current stabilization circuit of diode etc. are formed by the MC3403 operational amplifier of producing with TI company, signal is amplified and Filtering Processing, to reduce owing to the error that exists the air borne medium to cause serious interface decay to be brought, and the interference of resisting various neighbourhood noises, as shown in Figure 1.
Micro controller (MCU) module and wireless radio frequency modules constitute the ZigBee module.Take all factors into consideration factors such as volume, power consumption, cost, hardware and software development be simple and convenient, the ZigBee module adopts the system-level radio transceiver chip nRF9E5 that Nordic VLSI company released in 2004 in sensor node and the coordinator node, and its composition mainly contains built-in 8051 compatible microcontrollers (MCU), nRF905 433/868/915MHz radio-frequency (RF) transceiver and a four-way A/D converter.8051 compatible in nRF9E5 chip micro controller are enough deposited the protocol stack of ZigBee and are moved simple application program, can support the wireless radio frequency modules of high real-time well; It can be connected with a plurality of ultrasonic measurement modules by A/D converter, and the switch cubicle that the scene is moved carries out the data acquisition of multiple spot ultrasonic signal, improves data accuracy.NRF9E5 uses the ShockBurst technology, carries out high-speed data transmission, and the agreement relevant with rf data handled automatically by the nRF905 transceiver in the sheet.NRF9E5 utilizes SPI interface and nRF905 transceiver to carry out data transmission, and the power of data transmission, speed etc. can be by the configurations of SPI interface programming, and its wireless data transmission speed can reach 100kbps, maximum communication distance 500m.That nRF9E5 has is low in energy consumption, communication distance far away, compatible good, data transmission stability advantages of higher.
The present invention utilizes sonac 40RS/UT180 to be attached on the switch board housing of ground connection and detects, in when, in the switch cubicle shelf depreciation taking place when, sonac is gathered the ultrasonic signal in the environment, and being translated into electric signal, the echoed signal of handling well through the AFE (analog front end) filter amplification circuit is delivered to substation nRF9E5 again.In the nRF9E5 of substation, the electric signal that receives at first carries out the analog to digital conversion sampling via A/D converter, thereby obtains the ultrasonic signal amount in the detected environment; Discern processing by the MCU module again, and be converted into corresponding digital signal, and with its with test in the signal numerical value of actual measurement compare, to demarcate the actual strength of the ultrasonic signal that collects in the environment; Afterwards, nRF905 433/868/915MHz radio-frequency (RF) transceiver is wirelessly transmitted to relay router with the digital signal that collects.Substation nRF9E5 mainly is responsible for control and gathers ultrasonic shelf depreciation data, and carries out the control command that radio communication is uploaded data or received main website by relay router and the nRF9E5 of main website.Relay router is sent to the nRF9E5 of main website with data wireless.In the nRF9E5 of main website, at first receive the ultrasonic shelf depreciation data of switch cubicle of substation nRF9E5 timing acquiring by the nRF905 radio-frequency (RF) transceiver, discern processing by the MCU module again.The nRF9E5 of main website links to each other with the GPRS module by the RS-232 serial ports, be responsible for switch cubicle in ultrasonic shelf depreciation system set up data transmission channel, generally receive the ultrasonic shelf depreciation data of switch cubicle of substation nRF9E5 timing acquiring and transfer to the GPRS module, data are sent to remote monitoring center by GPRS network; Surveillance center also can use active mode to send ultrasonic shelf depreciation acquisition to the GPRS module on the other hand, passes to the substation nRF9E5 of ultrasonic shelf depreciation acquisition system then under the nRF9E5 of main website.Surveillance center provides the ultrasonic partial discharge monitoring of switch cubicle, the analysis software based on the VB exploitation, software is integrated data configuration, data acquisition, data monitoring and back-stage management function.Data transmission is to Surveillance center, by analysis, statistical computation goes out the characteristic quantity of shelf depreciation, distinguish the characteristic of shelf depreciation: the PHASE DISTRIBUTION figure that draws the partial discharge quantity of the different local discharge characteristics of multiple expression respectively, the discharge capacity distribution plan, the PHASE DISTRIBUTION figure of discharge time and their temporal variations, the row mode of going forward side by side identification.
Claims (2)
1. switch cubicle shelf depreciation supersonic detection device based on wireless network is characterized in that structure is: relay router and the coordinator node of sensor node outside being placed on switch cubicle that is installed on the switch cubicle constitutes monitoring network with the tree topology structure; Sensor node is made of sonac, AFE (analog front end) filter amplification circuit, A/D converter, sensor node micro controller MCU module and sensor node wireless radio frequency modules, sonac is gathered the ultrasonic signal that generates when in the switch cubicle shelf depreciation taking place and is sent to sensor node micro controller MCU module through AFE (analog front end) filter amplification circuit, A/D converter, and sensor node micro controller MCU module and sensor node wireless radio frequency modules constitute sensor node ZigBee module; Coordinator node is made of the telegon wireless radio frequency modules, telegon micro controller MCU module and the telegon GPRS module that link to each other successively, and telegon wireless radio frequency modules and telegon micro controller MCU module constitute coordinator node ZigBee module; Telegon GPRS module intercoms mutually with remote monitoring center GPRS module, and remote monitoring center GPRS module links to each other with the remote monitoring center computing machine by serial ports.
2. device as claimed in claim 1, it is characterized in that, the AFE (analog front end) filter amplification circuit is that the three grades of filter amplification circuit of core and the multiplication of voltage current stabilization circuit of diode are formed by operational amplifier, the output that three grades of filter amplification circuit are every grade is connected to the inverting input of next stage operational amplifier, inverting input from first order operational amplifier is imported, and the afterbody filter amplification circuit is exported through the multiplication of voltage current stabilization circuit.
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| CN 201110104114 CN102288879B (en) | 2011-04-25 | 2011-04-25 | Ultrasonic detection device for partial discharge of switchgear based on wireless network |
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| CN 201110104114 CN102288879B (en) | 2011-04-25 | 2011-04-25 | Ultrasonic detection device for partial discharge of switchgear based on wireless network |
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| CN 201110104114 Expired - Fee Related CN102288879B (en) | 2011-04-25 | 2011-04-25 | Ultrasonic detection device for partial discharge of switchgear based on wireless network |
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Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543422A (en) * | 2012-01-05 | 2012-07-04 | 江苏宏安变压器有限公司 | Technology for improving insulation resistance of dry transformer iron core and online monitoring system for partial discharge |
| CN103063906A (en) * | 2012-12-15 | 2013-04-24 | 安徽工程大学 | Electric power switch cabinet wireless monitoring system |
| CN103149516A (en) * | 2013-03-07 | 2013-06-12 | 江苏省电力公司电力科学研究院 | Multi-channel ultrasonic detection-based gas insulated switchgear fault source location method |
| CN103245898A (en) * | 2013-05-20 | 2013-08-14 | 国家电网公司 | Switch cabinet local discharging real-time monitoring system based on oxygen sensor |
| CN103824434A (en) * | 2013-07-12 | 2014-05-28 | 苏州科易特自动化科技有限公司 | Universal wireless data acquisition device and method |
| CN104049185A (en) * | 2014-05-22 | 2014-09-17 | 西安富邦科技实业有限公司 | Portable partial discharge detecting system and method |
| CN104698351A (en) * | 2015-02-12 | 2015-06-10 | 国家电网公司 | Local discharge monitoring device of switch cabinet |
| CN104730440A (en) * | 2015-04-03 | 2015-06-24 | 国家电网公司 | TEV-based switch cabinet partial discharge detection system |
| CN104808106A (en) * | 2015-04-02 | 2015-07-29 | 广州供电局有限公司 | Electrical equipment local discharge positioning method and system |
| CN105842594A (en) * | 2016-05-20 | 2016-08-10 | 国网河南省电力公司电力科学研究院 | Intelligent supersonic wave partial discharge on-line monitoring system and monitoring method |
| CN105913631A (en) * | 2016-04-11 | 2016-08-31 | 国网上海市电力公司 | Wireless data transmission method of partial discharge wireless monitoring system |
| CN105911436A (en) * | 2016-04-11 | 2016-08-31 | 国网上海市电力公司 | Supersonic wave-based partial discharge wireless monitoring system |
| CN105911435A (en) * | 2016-04-11 | 2016-08-31 | 国网上海市电力公司 | Ultrasonic wave wireless sensor |
| CN106124943A (en) * | 2016-07-01 | 2016-11-16 | 河北箱变电器有限公司 | A kind of power system partial discharge monitoring device |
| CN106154129A (en) * | 2016-07-22 | 2016-11-23 | 中国石油化工股份有限公司 | Wireless superfrequency GIS partial discharge detection method |
| CN106291270A (en) * | 2016-07-22 | 2017-01-04 | 中国石油化工股份有限公司 | GIS partial discharge supersonic detection method based on radio communication |
| CN106324448A (en) * | 2015-07-01 | 2017-01-11 | 云南电网有限责任公司昆明供电局 | Signal transmitter for online monitoring of partial discharge of high-voltage switch cabinet |
| CN106443389A (en) * | 2016-11-03 | 2017-02-22 | 合肥华义电气科技有限公司 | Partial discharge monitoring device of switch cabinet |
| CN109377744A (en) * | 2018-12-19 | 2019-02-22 | 国网新疆电力有限公司电力科学研究院 | A kind of partial discharge of switchgear data collection system based on FUSION WITH MULTISENSOR DETECTION |
| CN109507549A (en) * | 2018-11-16 | 2019-03-22 | 天津大学 | Partial discharge of switchgear based on wireless network monitors system |
| CN110687410A (en) * | 2019-10-15 | 2020-01-14 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Ultrasonic partial discharge test wireless transmission module |
| CN111754748A (en) * | 2020-05-28 | 2020-10-09 | 中山市惠丰达电气设备有限公司 | Ultrasonic wave partial discharge breakdown positioning system |
| CN113791176A (en) * | 2021-08-12 | 2021-12-14 | 深圳供电局有限公司 | Method and system for monitoring gas in switch cabinet |
| CN114113745A (en) * | 2021-11-12 | 2022-03-01 | 天津航空机电有限公司 | High-precision circuit capable of acquiring large current and small current |
| CN114280435A (en) * | 2021-12-24 | 2022-04-05 | 重庆科技学院 | Partial discharge management system of power system switch cabinet |
| CN115453288A (en) * | 2022-09-15 | 2022-12-09 | 惟精环境科技有限公司 | High tension switchgear partial discharge monitoring system |
| US11699561B2 (en) | 2020-11-24 | 2023-07-11 | Abb Schweiz Ag | System for monitoring a circuit breaker |
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Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543422A (en) * | 2012-01-05 | 2012-07-04 | 江苏宏安变压器有限公司 | Technology for improving insulation resistance of dry transformer iron core and online monitoring system for partial discharge |
| CN103063906A (en) * | 2012-12-15 | 2013-04-24 | 安徽工程大学 | Electric power switch cabinet wireless monitoring system |
| CN103149516A (en) * | 2013-03-07 | 2013-06-12 | 江苏省电力公司电力科学研究院 | Multi-channel ultrasonic detection-based gas insulated switchgear fault source location method |
| CN103245898A (en) * | 2013-05-20 | 2013-08-14 | 国家电网公司 | Switch cabinet local discharging real-time monitoring system based on oxygen sensor |
| CN103824434A (en) * | 2013-07-12 | 2014-05-28 | 苏州科易特自动化科技有限公司 | Universal wireless data acquisition device and method |
| CN104049185A (en) * | 2014-05-22 | 2014-09-17 | 西安富邦科技实业有限公司 | Portable partial discharge detecting system and method |
| CN104698351A (en) * | 2015-02-12 | 2015-06-10 | 国家电网公司 | Local discharge monitoring device of switch cabinet |
| CN104808106A (en) * | 2015-04-02 | 2015-07-29 | 广州供电局有限公司 | Electrical equipment local discharge positioning method and system |
| CN104730440A (en) * | 2015-04-03 | 2015-06-24 | 国家电网公司 | TEV-based switch cabinet partial discharge detection system |
| CN106324448A (en) * | 2015-07-01 | 2017-01-11 | 云南电网有限责任公司昆明供电局 | Signal transmitter for online monitoring of partial discharge of high-voltage switch cabinet |
| CN105913631A (en) * | 2016-04-11 | 2016-08-31 | 国网上海市电力公司 | Wireless data transmission method of partial discharge wireless monitoring system |
| CN105911436A (en) * | 2016-04-11 | 2016-08-31 | 国网上海市电力公司 | Supersonic wave-based partial discharge wireless monitoring system |
| CN105911435A (en) * | 2016-04-11 | 2016-08-31 | 国网上海市电力公司 | Ultrasonic wave wireless sensor |
| CN105842594A (en) * | 2016-05-20 | 2016-08-10 | 国网河南省电力公司电力科学研究院 | Intelligent supersonic wave partial discharge on-line monitoring system and monitoring method |
| CN106124943A (en) * | 2016-07-01 | 2016-11-16 | 河北箱变电器有限公司 | A kind of power system partial discharge monitoring device |
| CN106154129A (en) * | 2016-07-22 | 2016-11-23 | 中国石油化工股份有限公司 | Wireless superfrequency GIS partial discharge detection method |
| CN106291270A (en) * | 2016-07-22 | 2017-01-04 | 中国石油化工股份有限公司 | GIS partial discharge supersonic detection method based on radio communication |
| CN106443389A (en) * | 2016-11-03 | 2017-02-22 | 合肥华义电气科技有限公司 | Partial discharge monitoring device of switch cabinet |
| CN109507549A (en) * | 2018-11-16 | 2019-03-22 | 天津大学 | Partial discharge of switchgear based on wireless network monitors system |
| CN109377744A (en) * | 2018-12-19 | 2019-02-22 | 国网新疆电力有限公司电力科学研究院 | A kind of partial discharge of switchgear data collection system based on FUSION WITH MULTISENSOR DETECTION |
| CN110687410A (en) * | 2019-10-15 | 2020-01-14 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Ultrasonic partial discharge test wireless transmission module |
| CN111754748A (en) * | 2020-05-28 | 2020-10-09 | 中山市惠丰达电气设备有限公司 | Ultrasonic wave partial discharge breakdown positioning system |
| US11699561B2 (en) | 2020-11-24 | 2023-07-11 | Abb Schweiz Ag | System for monitoring a circuit breaker |
| CN113791176A (en) * | 2021-08-12 | 2021-12-14 | 深圳供电局有限公司 | Method and system for monitoring gas in switch cabinet |
| CN114113745A (en) * | 2021-11-12 | 2022-03-01 | 天津航空机电有限公司 | High-precision circuit capable of acquiring large current and small current |
| CN114280435A (en) * | 2021-12-24 | 2022-04-05 | 重庆科技学院 | Partial discharge management system of power system switch cabinet |
| CN115453288A (en) * | 2022-09-15 | 2022-12-09 | 惟精环境科技有限公司 | High tension switchgear partial discharge monitoring system |
| CN115453288B (en) * | 2022-09-15 | 2024-03-08 | 惟精环境科技有限公司 | Partial discharge monitoring system of high-voltage switch cabinet |
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