CN202903892U - A transformer station capacitance on-line monitoring device based on a wireless mode - Google Patents
A transformer station capacitance on-line monitoring device based on a wireless mode Download PDFInfo
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- CN202903892U CN202903892U CN 201220216683 CN201220216683U CN202903892U CN 202903892 U CN202903892 U CN 202903892U CN 201220216683 CN201220216683 CN 201220216683 CN 201220216683 U CN201220216683 U CN 201220216683U CN 202903892 U CN202903892 U CN 202903892U
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The utility model belongs to the technical field of electric power equipment on-line monitoring and specifically relates to a transformer station capacitance on-line monitoring device based on a wireless mode. The on-line monitoring device mainly comprises following steps. Self-powered current measuring units are mounted on the high voltage sides of capacitors. Self-powered voltage measuring units are mounted on the secondary side output ends of discharging PTs of shunt capacitor groups. A computer and a wireless module disposed inside a monitoring base station send a capacitor voltage and current synchronous sampling start conversion command, receive, store, and manage measured data, calculate capacitance and dielectric loss of the capacitors by using spectral analysis, and transmit a calculated result to a monitoring host machine in a remote monitoring center to perform comprehensive assessment and analysis. A fault alarm is given if capacitance variation of a capacitor is more that a certain value.
Description
Technical field
The utility model belongs to the electrical equipment online supervision technical field, is specifically related to a kind of transformer station's electric capacity on-Line Monitor Device based on wireless mode.
Background technology
Shnt capacitor is widely used in the reactive power compensation of electric system, generally is installed in to adopt centralized compensation in the transformer station, and the capacitor group structure of certain 500KV transformer station as shown in Figure 1.Along with the continuous increase of expanding day and the workload demand of electrical network scale, system is more and more frequent to its voltage and idle adjusting, and the safe operation of Shunt Capacitor Unit plays very important effect for stable, the normal power supply of whole electric system.When certain capacitor damage in the frame type capacitive device group caused whole group of electric capacity tripping operation, other electric capacity may damage because being hit, and the quick-fried fault of capacitor cohort can occur severe patient, thereby has enlarged scope and the impact of accident.
Because the direct loss that electrical equipment fault causes are huge, and can't be estimated especially by the indirect loss that power failure causes.Traditional is that periodic maintenance is finished to electric power apparatus examination by preventive trial, but preventive trial is off-line to carry out, the test of namely under power down mode, carrying out, the characteristics that cycle is long, voltage is low are arranged usually, and equipment state (such as trial voltage, temperature etc.) and state in service are inconsistent after having a power failure, and test findings can not reflect the fault state of equipment very truly.And repair based on condition of component can in time reflect the running status of power equipment, thereby in time finds defective, improves the whole system power supply reliability, thereby becomes the trend of power system device maintenance development.
The precondition that realizes equipment state overhauling is the research and development application of Electric Power Equipment Insulation on-line monitoring and fault diagnosis technology.For the on-line monitoring of electric power compensation capacitor group, it mainly is the monitoring to its electric capacity and dielectric loss parameter.The bad meeting of capacitive insulation causes condenser capacitance value generation significant change, and electric capacity is the direct parameter of capacitor faults early warning; The monitoring dielectric loss can be found the whole deteriorated of capacitor insulation equally delicately.Although the fast development along with the electrical equipment online supervision technology, the on-line monitoring system that can be applicable to the capacitive character power equipment begins to obtain research and development and uses, and become the useful of preventive trial method and replenished, but literature search shows that the research and development for converting station electric power compensation condenser group on-line monitoring still are in the blank stage specially.
Dec 21 2005 day for announcing, notification number is that the Chinese invention patent (patent No. 200410026133.2) of CN 1232831C discloses a kind of " capacitive character power equipment dielectric loss on-line monitoring method and device ", key step has: (1) gathers equipment leakage current signal on the ground wire, after being transferred to the first signal conditioner that is positioned at Control Room and processing through signal cable, send into the data collecting card first passage and gather; (2) gather the output of transformer substation voltage mutual inductor low pressure and obtain reference voltage signal, after being transferred to the secondary signal conditioner that is positioned at Control Room and processing through signal cable, send into the data collecting card second channel and gather; Trigger first passage by the second channel signal during collection, gather simultaneously to guarantee two passages; (3) computing machine two paths of signals that data collecting card is collected carries out spectrum analysis and obtains their angular difference and angular difference tangent value (dielectric loss); (4) in the computing machine database is set, Monitoring Data is carried out data management and inquiry, realize remote monitoring by Web server.This invention is converted into first digital signal by gathering system voltage and the earth leakage electric current of capacitive character power equipment, and equipment dielectric loss is asked in recycling spectrum analysis (Fourier transform).This invention realized the on-line monitoring of capacitive character power equipment dielectric loss, to the digitized processing of collection signal and utilize the management of computer realization data and historical data analysis, inquiry.There is subject matter in the method: (1) conceptual design is taked wired mode: namely all signals all transmit by signal cable.In the middle of reality, a voltage transformer (VT) (PT) and some s' capacitive equipment is installed on the same bus in the transformer station usually, therefore in order to carry out on-line monitoring to the insulation parameter of all capacitive equipments, need to lay numerous signal cables the secondary side voltage signal of this PT is guided to respectively process accordingly in the harvester of each capacitive equipment after, again capture card output is introduced the computing machine that computational analysis is used by many cables respectively, do like this and can bring a lot of drawbacks.At first, transformer station for 110KV and above, because the distance between the distinct device is distant, as being easy to distorted in the long-distance transmissions of reference voltage signal under transformer station's complex electromagnetic environment of calculating usefulness, thereby affect measuring accuracy, cause the erroneous judgement of fault.Secondly, length also can increase the probability that produces cable earth fault apart from cabling, affects the security of system reliability service.Moreover transformer station's capacitive equipment is numerous, need lay a large amount of cables, and the site operation amount is large.In addition, if the transforming plant primary equipment main electrical scheme changes, can produce all that transmission signal cable lays or the dismounting problem; (2) for the Reactive Compensation Capacitor in Substation group, measured capacitance is in the electrification in high voltage state all the time, consider based on insulation safety, do not allow PT secondary side voltage signal is received on the capacitance current collecting unit that is in high pressure conditions with wired mode yet, thereby this technical scheme and be not suitable for the on-line monitoring of substation compensation capacitor group.
Open day on June 28th, 2006, notification number is that the Chinese invention patent application (application number 200510022748.2) of CN 1793990A discloses a kind of " capacitive equipment dielectric loss on-line monitoring system ", comprises tester, central computer and current sampling circuit.This invention takes central computer to pass through a plurality of relatively independent testers of GPRS Wireless remote control, by the GPS module of installing on the tester, realize the synchronous acquisition in strange land, after receiving the image data of tester passback, the data that gather are carried out Fourier analysis, try to achieve the fundamental phase of the sample rate current of each capacitive equipment, try to achieve each other dielectric loss angular difference by phase place again.This application scheme emphasis has solved the strange land synchronous acquisition problem between a plurality of relative distances decentralized capacitance equipment far away, can make tester access sampling nearby, thereby utilize the GPRS wireless network can satisfy the characteristics of telecommunication instruction, monitor simultaneously the dielectric loss angular difference between a plurality of capacitive equipments.But in the face of common tens situations that install concentratedly in the same place of power capacitor of monitoring target frame-type Shunt Capacitor Unit of the present invention, then have series of problems: (1) this application scheme can only be utilized the end shield current signal of a plurality of capacitive equipments of current sampling circuit synchronous acquisition of its design, obtain its phase differential after the calculating, utilize the dielectric loss angular difference of its sign indirectly to judge the dielectric loss of equipment under test (with the less capacitive equipment of dielectric loss as benchmark), can not obtain and the real medium loss value of store electricity capacitive equipment and capacitance value and with history value relatively, assessment adopts benchmark (self can change) pairing comparision to be difficult to guarantee the accuracy that detects; (2) current sampling circuit of this application scheme can only be worked as short circuit grounding disconnecting link with it in parallel and pulled open Shi Caike and carry out and finish live testing, and when capacitive equipment end shield current earthing, grounding switch K is closed, can't realize the continuous on-line sampling of equipment; (3) this application scheme is to overcome the poor problem of GPRS network real-time communication, GPRS module and GPS module are installed on each tester and adopt storage battery power supply, because its tester and current sampling circuit can be placed on capacitive equipment end shield ground connection place, needn't too consider volume, output power and repair and replacement problem, but in the face of concentrating a large amount of Reactive Compensation Capacitor in Substation groups of installing, the one, it is high to install a large amount of GPRS modules and GPS module cost additional, investment is large, the more important thing is because the restriction of operation high pressure and installing space, the measuring equipment volume is installed in requirement additional must be enough little and long-term continuous powered operation as much as possible, therefore must reduce device volume, power consumption, reduce as far as possible the maintenance that may affect the equipment operation and change, this application scheme obviously can't satisfy this point.
April 6 2011 day for announcing, notification number is that the Chinese invention patent (application number 200910021454.6) of CN 101493485B also discloses a kind of " on-line monitoring system for capacitive equipment dielectric loss angle ", comprise microprocessor, the leakage current signal acquisition module, the GPS synchronization module, wireless communication module, the A/D sampling module, the frequency measurement sampling unit, it adopts the mode of layered distribution type structure centralized management, according to functional requirement system is divided into monitor layer, key-course and Information Level are finished the strange land synchronous acquisition to a plurality of different capacitive equipments in strange land by a monitoring main frame (key-course) a plurality of field monitoring extension sets of control (comprising collecting unit SU and intelligent processing unit IPU); Its existing problems are: select one group of capacitive equipment to make reference standard on (1) monitoring principle, extract and use behind its end shield electric current relatively method to carry out fault to judge, thereby can not obtain detection data and the history value thereof of capacitive equipment electric capacity and dielectric loss value are assessed contrast to its variation tendency; (2) its field monitoring extension set (comprising microprocessor, leakage current signal acquisition module, A/D sampling module, frequency measurement sampling unit, wireless communication module, GPS module) has installed network service and GPS module additional for realizing the strange land synchronous acquisition, supply not only that electrical power consumed is large, operating cost is high, be difficult to the continuous powerup issue of solution equipment, if a large amount of concentrate that to install obvious investment additional huge, be not suitable for the concentrated monitoring of a large amount of electric capacity of substation compensation capacitor group; (3) for the monitoring of transformer station's building-out capacitor, require tested voltage and tested electric current to carry out grab sampling at same position, otherwise will cause the unstable of Fourier's result of calculation, GPS in this scheme to the time obviously can not satisfy, GPS to the time can only guarantee tested current sample between a plurality of field apparatuss mutually constantly synchronously, but can not solve the problem that the tested voltage of building-out capacitor and tested electric current must carry out at same position grab sampling, and how this scheme does not provide and is measuring the design proposal of equipment voltage with electric current same position fixed point as far as possible, thereby is only applicable to use relatively method to measure capacitive equipment end shield electric current to carry out the scheme that fault is judged.
Summary of the invention
The technical problems to be solved in the utility model is: realize continuous, real time on-line monitoring to electric capacity and the dielectric loss parameter of all electric capacity of converting station electric power compensation condenser group; Solve compensation condenser and operate in high pressure conditions, its working current sampling must be satisfied the problem of electric power insulation safety that rules require; Install in a large number that the investment that network communication module and GPS module may bring is large, the high problem of cost is paid dues in operation additional if solve compensation condenser electric current, voltage detection unit, solve its low-power consumption and long-term, continuous powerup issue; Solve the tested voltage of building-out capacitor and tested electric current palpus co-located fixed point, synchronized sampling problem; A kind of transformer station's electric capacity on-Line Monitor Device of the compensation condenser group that is applicable to install concentratedly in a large number in the transformer station is provided.
Design proposal of the present utility model is:
A kind of transformer station's electric capacity on-Line Monitor Device based on wireless mode is characterized in that, comprising:
Current measuring unit: comprise at least the little electric current CT of punching, with microprocessor, supply module and the wireless module of A/D conversion; The little electric current CT of described punching is socketed on and is used for the coupling capacitance working current on the capacitor high voltage side wire, its two-way is exported one the tunnel and is connected to microprocessor A/D conversion input end for current sample, another road is connected to supply module carries out exporting the electric energy power supply after the rectifying and wave-filtering voltage stabilizing, and described microprocessor connects wireless module;
Voltage measurement unit: be installed in the secondary side output terminal of capacitor set discharge PT, comprise at least microprocessor, power module and wireless module with the A/D conversion; The secondary side output terminal one tunnel of discharge PT is connected to microprocessor A/D conversion input end and is used for voltage sample, and another road is connected to power module carries out exporting the electric energy power supply after the rectifying and wave-filtering voltage stabilizing, and described microprocessor connects wireless module;
Monitoring base station: arrange on the spot in transformer station, comprise at least computing machine and wireless module, computing machine sends order and receives measurement data to current measuring unit and voltage measurement unit by connected wireless module; And result of calculation is sent to remote monitoring center;
Remote monitoring center: comprise monitoring host computer, receive the electrical substation monitoring base station data.
Preferably, described monitoring base station also includes a fixed phase module and an interface module; Described fixed phase module reads in the transformer station in the three-phase alternating voltage any one and carries out input computer CPU after the frequency measurement sampling as ac reference voltage; Described interface module disposes wired RS485 interface, optical fiber interface or wireless GPRS mixed-media network modules mixed-media, is used for computer CPU output is sent to remote monitoring center by wired or wireless mode.
Transformer station's electric capacity on-Line Monitor Device based on wireless mode of the present utility model, can realize the electric capacity of converting station electric power compensation condenser group electric capacity and the on-line monitoring of dielectric loss, the working current of co-located, each electric capacity of synchronized sampling and operating voltage, adopt wireless mode to realize synchronized sampling control and transmission measurement data, utilize computing machine to finish data and process and the fault analysis alarm; May further comprise the steps:
1) installs the self powered current measuring unit additional in the design of the high-pressure side of every electric capacity, obtain the working current of each electric capacity and be wirelessly transmitted to the monitoring base station that is positioned at transformer station;
2) be chosen in each secondary side output terminal of organizing the discharge PT of shunt capacitance and install self-powered voltage measurement unit additional, obtain the fixed point operating voltage of respectively organizing electric capacity and be wirelessly transmitted to the monitoring base station that is positioned at transformer station;
3) each voltage, current measuring unit start synchronized sampling after receiving the Collect conversion order that base station radio sends immediately;
4) monitoring base station is set in transformer station, built-in computer and wireless module: 1. send capacitance voltage, electric current synchronized sampling startup conversion command, 2. receive measurement data and storage administration, 3. utilize spectrum analysis to calculate electric capacity and the dielectric loss of every electric capacity, 4. result of calculation is sent to the remote monitoring center monitoring host computer; Preferably, described monitoring base station also is built-in with a fixed phase module, and the moment that the base station sends capacitance voltage, electric current synchronized sampling startup conversion command is the zero crossing of industrial frequency AC signal in the fixed phase module;
5) the remote monitoring center monitoring host computer receives the electrical substation monitoring base station data, to same capacitance data carry out historical comparison, capacitance data laterally reaches respectively vertical contrast on the same group, behind the variable quantity of comprehensive assessment capacitive insulation parameter, to the capacitor proposition fault warning of variable quantity greater than certain value.
Compared with prior art, the utlity model has following technical characterictic:
1, the utility model is by detecting the continuous, online of substation capacitors group electric capacity operating voltage, current parameters, calculate electric capacity and the dielectric loss value of capacitance apparatus, real-time measurement, data query, historical comparison and fault diagnosis to the main insulation parameter of capacitance apparatus have been realized, for the repair based on condition of component of realizing power equipment provides the practical technique scheme.
2, employing is installed the position concentratedly in the substation compensation capacitor group and is installed monitoring base station additional in the scene on the spot, utilize short distance between base station and the tested a plurality of electric capacity, low-power, wireless communication module is (such as bluetooth module or the use 433MHz that uses the 2.4GHz frequency range, the wireless module of the free frequency range such as 866MHz) finishes capacitance voltage, the design proposal of the collection of current signal wireless synchronization and data transmission, avoided cable to lay, solve capacitor group in centralized arrangement and installed in a large number the investment that network communication module and GPS module may be brought additional, expense and powerup issue, realized image data between measuring unit and the base station continuously, safety, the isolation transmission, greatly reduce system cost, simultaneously owing to adopt digital transmission, anti-electromagnetic interference capability is strong, improved the reliability of the data, experiment results proved, the stability of sampling measurement result after data filtering repeatedly is better than the GPS scheme that adopts in the utility model scheme.
3, with respect to the end shield ground connection place of selecting current measuring unit is placed on the capacitive character power equipment in the prior art, its current measuring unit is unrestricted, needn't too consider volume, insulation and power supply mode problem, and the compensation condenser group that transformer station installs concentratedly work the time is to be in all the time (to see in accompanying drawing 1 circuit in the high pressure conditions, A phase high-pressure side 35KV, A, 2 of B all are in high pressure over the ground), consider insulating requirements and each other safe distance problem, the current measuring unit volume that directly is attached on the capacitance apparatus should be enough little, low-power consumption and energy are long-term, continuously, the self-powered operation, the utility model is by installing the little electric current CT of punching additional from the design proposal of equipment under test sampling and acquisition working power, the ingenious self-powered problem that has solved current measuring unit at capacitor high voltage side wire.Because punching CT volume is very little, its power supply capacity is also very little, and if installed the GPS module additional its output energy can not meet the demands.
4, must co-located fix a point for solving the tested voltage of building-out capacitor and tested electric current, the synchronized sampling problem, the effect of high-voltage capacitor discharge PT has been expanded and utilized to the utility model, because it is the necessary technology safety practice of shnt capacitor in the transformer station that discharge PT is installed, and the operating voltage of discharge PT and capacitor is identical, therefore the utility model installs technical scheme that voltage measurement unit gathers this group electric capacity operating voltage additional by the secondary output terminal at every group capacitor discharge PT and has solved very dexterously capacitance voltage on the same group, electric current co-located grab sampling problem, and the output of usually selecting bus PT in the prior art obviously can not realize and the equipment under test electric current of remote multiple spot distribution and the same position grab sampling of its operating voltage.
5, the utility model utilizes wireless mode that the measurement data of power capacitor is transmitted, and avoids to the full extent other multioutlet on high-voltage capacitance equipment, does not affect the insulating property of equipment under test because of increase checking equipment.
Description of drawings
Fig. 1 is the compensation condenser group structural representation of certain 500KV transformer station.
Fig. 2 is embodiment of the present utility model, utilize the base station to A among Fig. 1, between 2 of the B 5 on the same group shnt capacitor carry out the system architecture synoptic diagram (wherein I1, I2, I3, I4, I5 are respectively the current measuring unit that installs additional in capacitor C 1, C11, C12, C13, C14 high-pressure side correspondence, the voltage measurement unit of V1 for installing additional at this group capacitor discharge PT secondary side output terminal) of on-line monitoring.
Fig. 3 be embodiment of the present utility model to A among Fig. 1, between 2 of the B 5 on the same group shnt capacitor carry out the workflow diagram of on-line monitoring.
Fig. 4 is the schematic block circuit diagram of embodiment current measuring unit of the present utility model.
Fig. 5 is the schematic block circuit diagram of embodiment voltage measurement unit of the present utility model.
Fig. 6 is the schematic block circuit diagram of embodiment monitoring base station of the present utility model.
Fig. 7 is the workflow diagram of monitoring base station computing machine in the utility model.
Embodiment
Fig. 1 is the compensation condenser group structural representation of certain 500KV transformer station.Only draw A phase building-out capacitor among the figure, B phase, C phase compensation capacitance structure are mutually identical with A, 40 of A phase electric capacity, so totally 120 of three-phase building-out capacitors.A phase high side voltage is 35KV, there are 5 column capacitances in the left side, classify example as with right several first, because power capacitor directly connects with transmission line of electricity, be in A, 2 measured capacitance of B all are in high pressure conditions (except the E point) over the ground, consideration based on insulation safety, we can not receive voltage signal on the current measuring unit that is in high pressure conditions with wired mode, and be to guarantee that the measurement result that draws after FFT (Fast Fourier Transform (FFT)) calculates is stable, each sampling must satisfied be carried out the co-located grab sampling from the electric capacity position to its operating voltage and working current, for addressing the above problem, the utility model discloses a kind of transformer station's electric capacity on-line monitoring method based on wireless mode, can realize the electric capacity of converting station electric power compensation condenser group electric capacity and the on-line monitoring of dielectric loss, its core is: co-located, the working current of each electric capacity of synchronized sampling and operating voltage, adopt wireless mode to realize synchronized sampling control and transmission measurement data, utilize computing machine to finish data and process and the fault analysis alarm; Mainly may further comprise the steps:
1) installs the self powered current measuring unit additional in the design of the high-pressure side of every electric capacity, obtain the working current of each electric capacity and be wirelessly transmitted to the monitoring base station that is positioned at transformer station;
2) be chosen in each secondary side output terminal of organizing the discharge PT of shunt capacitance and install self-powered voltage measurement unit additional, obtain the fixed point operating voltage of respectively organizing electric capacity and be wirelessly transmitted to the monitoring base station that is positioned at transformer station;
3) each voltage, current measuring unit start synchronized sampling after receiving the Collect conversion order that base station radio sends immediately;
4) monitoring base station is set in transformer station, built-in computer and wireless module: 1. send capacitance voltage, electric current synchronized sampling startup conversion command, 2. receive measurement data and storage administration, 3. utilize spectrum analysis to calculate electric capacity and the dielectric loss of every electric capacity, 4. result of calculation is sent to the remote monitoring center monitoring host computer;
5) the remote monitoring center monitoring host computer receives the electrical substation monitoring base station data, to same capacitance data carry out historical comparison, capacitance data laterally reaches respectively vertical contrast on the same group, behind the variable quantity of comprehensive assessment capacitive insulation parameter, to the capacitor proposition fault warning of variable quantity greater than certain value.
For the online detection of power capacitor, it mainly is the measurement of capacity and dielectric loss.It is that FFT (fast fourier transform) algorithm calculates first-harmonic and the harmonic component that decomposites in voltage, the electric current that the technical solution of the utility model is utilized Spectral Analysis Method of the prior art, on the basis that calculates voltage fundamental, current first harmonics and phase differential thereof, carry out the calculating of each condenser capacity and dielectric loss value.
Fig. 2 realizes A among Fig. 1 for adopting said method, between 2 of the B 5 on the same group shnt capacitor carry out the system architecture synoptic diagram of the embodiment of the present utility model of on-line monitoring.Wherein I1, I2, I3, I4, I5 are respectively the current measuring unit that installs additional in capacitor C 1, C11, C12, C13, C14 high-pressure side correspondence, the voltage measurement unit of V1 for installing additional at this group capacitor discharge PT secondary side output terminal.Wherein:
1) current measuring unit I1, I2, I3, I4, I5: comprise respectively the little electric current CT of punching, with microprocessor, supply module and the wireless module of A/D conversion; The little electric current CT of described punching is socketed on respectively and is used for the coupling capacitance working current on capacitor C 1, C11, C12, C13, the C14 high-pressure side wire, its two-way is exported one the tunnel and is connected to microprocessor A/D conversion input end for current sample, another road is connected to supply module and carries out exporting the electric energy power supply after the rectifying and wave-filtering voltage stabilizing, immediately starting current sampling input end A/D changed after described microprocessor received synchronized sampling startup conversion command by connected wireless module, and the current data of obtaining is sent to monitoring base station by wireless module;
2) voltage measurement unit V1: be installed in the secondary side output terminal of capacitor set discharge PT1, comprise microprocessor, power module and wireless module with the A/D conversion; The secondary side output terminal one tunnel of discharge PT1 is connected to microprocessor A/D conversion input end and is used for voltage sample, another road is connected to power module and carries out exporting the electric energy power supply after the rectifying and wave-filtering voltage stabilizing, immediately trigger voltage sampling input end A/D changed after described microprocessor received synchronized sampling startup conversion command by connected wireless module, and the voltage data that obtains is sent to monitoring base station by wireless module;
3) monitoring base station: in transformer station, arrange on the spot, built-in computing machine and the wireless module of comprising at least, computing machine sends voltage, electric current synchronized sampling startup conversion command and reception, store and management measurement data by wireless module to current measuring unit and voltage measurement unit; Based on institute's image data, computer CPU utilizes spectrum analysis to calculate the electric capacity of every electric capacity and dielectric loss and result of calculation is sent to remote monitoring center; In embodiment of the present utility model, monitoring base station also includes a fixed phase module, the fixed phase module reads in the transformer station in the three-phase alternating voltage any one and carries out input computer CPU after the frequency measurement sampling as ac reference voltage, and the zero crossing that reads simultaneously the industrial frequency AC signal sends the moment that voltage, electric current synchronized sampling start conversion command as the base station; Further, the monitoring base station computing machine also comprises an interface module, comprise the wired RS485 interface of configuration, optical fiber interface or configuration wireless GPRS mixed-media network modules mixed-media, be used for that computer CPU is exported result of calculation and be sent to remote monitoring center by wired or wireless mode.
4) remote monitoring center (not shown in FIG.): comprise monitoring host computer, receive the electrical substation monitoring base station data and utilize ORACLE database software archive management by the built-in GPRS network module of RS485 interface twisted-pair feeder, optical fiber or monitoring host computer, utilize B/S (Browser/Server) pattern to realize that long-range historical data and fault diagnosis result are inquired about, warning function.The diagnosis of capacitor group fault adopt to same capacitance data carry out historical comparison, capacitance data laterally reaches respectively vertical contrast on the same group, behind the variable quantity of comprehensive assessment capacitive insulation parameter, variable quantity is proposed fault warning greater than the capacitor of certain value.
With reference to figure 3 embodiment of the present utility model to A among Fig. 1, between 2 of the B 5 on the same group shnt capacitor carry out the workflow of on-line monitoring, mainly may further comprise the steps:
Step 101: the monitoring base station computing machine sends capacitance voltage, electric current synchronized sampling startup conversion command by wireless module;
Step 102: the self-powered current measuring unit that the capacitor high voltage side installs additional starts synchronized sampling after receiving the Collect conversion order that base station radio sends immediately, obtains the working current of each electric capacity and is wirelessly transmitted to monitoring base station;
Step 103: the self-powered voltage measurement unit that capacitor discharge PT secondary side output terminal installs additional starts synchronized sampling after receiving the Collect conversion order that base station radio sends immediately, obtains the fixed point operating voltage of respectively organizing electric capacity and is wirelessly transmitted to monitoring base station;
Step 104: the monitoring base station computing machine is by wireless module receiver voltage, current measurement data and storage administration;
Step 105: the monitoring base station computing machine utilizes spectrum analysis to calculate the electric capacity of every electric capacity and dielectric loss and result of calculation is sent to the remote monitoring center monitoring host computer;
Step 106: the remote monitoring center monitoring host computer receives the electrical substation monitoring base station data, to same capacitance data carry out historical comparison, capacitance data laterally reaches respectively vertical contrast on the same group, behind the variable quantity of comprehensive assessment capacitive insulation parameter, to the capacitor proposition fault warning of variable quantity greater than certain value.
With reference to the schematic block circuit diagram of figure 4 the utility model embodiment current measuring units, current measuring unit comprises the little electric current CT of punching, with microprocessor, supply module and the wireless module of A/D conversion; The little electric current CT of punching is socketed on and is used for the coupling capacitance working current on the capacitor high voltage side wire, its two-way is exported one the tunnel and is connected to microprocessor A/D conversion input end after utilizing prior art to amplify to process with filtering and is used for current sample, another road is connected to supply module carry out rectification, filtering, voltage stabilizing and process after the output electric energy be the current measuring unit power supply.In actual the use, the A/D conversion chip can adopt AD976CN, and chip speed 100KHz has high acquisition rate and high-resolution, can satisfy the requirement of picking rate and acquisition precision.Cpu chip can adopt the 89C51 chip, link to each other with RAM, the synchronized sampling that initially at first receives in each sampling period starts conversion command and sampling rate, then immediately starting current sampling input end A/D conversion, according to the given sampling rate of CPU finish one in the cycle sampling number and the A/D chip obtained sampled value deposit RAM in, after the data that gathered a power frequency period, data communication device in the RAM is crossed wireless module send monitoring base station, wireless module can be selected the bluetooth module of commercially available 2.4GHz frequency range.
In the present embodiment, the little electric current CT of punching is socketed on and is used for the coupling capacitance working current on the capacitor high voltage side wire and exports supplying electric flux all to adopt prior art.Wherein but the little electric current CT of punching can adopt sieve Paderewski sensing coil, being made into as required a winding is that core-theaded type can be born tested electric current and corresponding requirements, the iron core good by the wide load characteristic of high sensitivity adapts to the little current signal of mA grade standard of measuring needs in secondary output, the magnetic core of micro electric flow sensor is selected adaptation according to the characteristic of measured signal material is highly sensitive when guaranteeing little electric current, exceed and have saturation characteristic when measuring range of current, fault enlarges when avoiding excess current, its secondary output formation geometric ratio is input to microprocessor A/D conversion input end in the secondary current i of measured current I and carries out signal processing and A/D conversion, and the ratio of I/i is set in the cpu chip of microprocessor.Described supply module is finished the rear continuous working that the electric energy that needs satisfies microprocessor and wireless module of taking out is processed in the rectification of the little electric current CT of punching output current, filtering, voltage stabilizing.In the Practical Project, because power capacitor directly connects with transmission line of electricity, for reducing the quantities of installing in the work progress, the little electric current CT of punching also can adopt Open Type Electric Current Mutual Inductor (for example split core type current transformer).
With reference to the schematic block circuit diagram of figure 5 the utility model embodiment voltage measurement units, voltage measurement unit V1 is installed in the secondary side output terminal of capacitor set discharge PT1, comprises microprocessor, power module and wireless module with the A/D conversion; The secondary side output terminal output signal one tunnel of discharge PT1 utilizes that prior art is isolated, amplification, filtering are connected to microprocessor A/D conversion input end after processing and are used for voltage sample, another road is connected to power module carry out overvoltage protection and voltage stabilizing and process after the power supply of output electric energy; The secondary side output end voltage v of discharge PT1 and the no-load voltage ratio V/v of tested voltage V set in the cpu chip of microprocessor, in actual the use, the A/D conversion chip can adopt AD976CN, chip speed 100KHz, have high acquisition rate and high-resolution, can satisfy the requirement of picking rate and acquisition precision; Cpu chip can adopt the 89C51 chip, link to each other with RAM, the synchronized sampling that initially at first receives in each sampling period starts conversion command and sampling rate, then immediately trigger voltage sampling input end A/D conversion, the sampling rate of setting according to CPU finish one in the cycle sampling number and the A/D chip obtained sampled value deposit RAM in, after the data of the complete power frequency period of every collection, data communication device in the RAM is crossed wireless module send monitoring base station, wireless module can be selected the bluetooth module of commercially available 2.4GHz frequency range; Described power module is finished the overvoltage protection of the secondary side output voltage of discharge PT1 and voltage stabilizing is processed the rear continuous working that the electric energy that needs satisfies microprocessor and wireless module of taking out, and adopts prior art.
Schematic block circuit diagram with reference to figure 6 embodiment monitoring base stations of the present utility model, monitoring base station comprises computing machine and wireless module, and computing machine sends voltage, electric current synchronized sampling startup conversion command and reception, store and management measurement data by wireless module to current measuring unit and voltage measurement unit; Based on institute's image data, computing machine utilizes spectrum analysis to calculate the electric capacity of every electric capacity and dielectric loss and result of calculation is sent to remote monitoring center.In the present embodiment, the computing machine of monitoring base station adopts FPGA (Field Programmable Gate Array) FPGA development board (integrated CPU, peripheral hardware, storer and I/O interface) as the main hardware carrier, with microprocessor as system's control core, the work frequency of finishing ac reference voltage in the transformer station detects and realization high-speed synchronous controlling of sampling, and the data receiver communication is controlled and finished to the base station workflow.Specifically comprise: the fixed phase module, select the EP1C6Q240C8 of Altera company chip, utilize FPGA plate design phase-locking frequency multiplication circuit, read in the transformer station in the three-phase alternating voltage any one and carry out the frequency measurement sampling and calculate sampling rate (prior art) in cycle of output as ac reference voltage, with guarantee that capacitance voltage, current signal satisfy that FFT (Fast Fourier Transform (FFT)) requires 2
nSampling number, actual zero crossing with the industrial frequency AC signal be as the triggering sign of one-period power frequency sampling starting point, and namely the base station sends the moment that voltage, electric current synchronized sampling start conversion command; Further, the monitoring base station computing machine also comprises an interface module, comprises the wired RS485 interface of configuration, optical fiber interface or configuration wireless GPRS mixed-media network modules mixed-media, is used for result of calculation is sent to remote monitoring center by wired or wireless mode.
Present embodiment adopts to be installed the position concentratedly in the substation compensation capacitor group and installs monitoring base station additional in the scene on the spot, utilize short distance between base station and the tested a plurality of electric capacity, low-power, 2.4GHz the bluetooth module of frequency range (also can use 433MHz, the wireless module of the free frequency range such as 866MHz) finishes capacitance voltage, the design proposal of the collection of current signal wireless synchronization and data transmission, utilize image data between measuring unit and base station continuously, safety, the isolation transmission, avoid cable to lay, both satisfied the insulation safety requirement of building-out capacitor high-voltage operation, simultaneously as capacitance voltage, the relay reception repeater station of current signal, by adopting the short distance digital transmission, greatly improved the reliability of the data, experiment results proved, the stability of the utility model scheme measurement result are better than the GPS scheme that adopts.
Fig. 7 is the workflow diagram of monitoring base station computing machine in the utility model.
After system's power-up initializing, self check are passed through, at first read transformer station's base station numbering and capacitor group sequence number, be used for the packing management of sampled data; Then read fixed phase module frequency measurement signal and calculating sampling speed, after the industrial frequency AC signal zero crossing arrives, trigger and send sampling rate and voltage by wireless module, the electric current synchronized sampling starts conversion command, voltage, current measuring unit starts sampling input end A/D conversion after receiving and starting conversion command, also will obtain sampled value deposits RAM in to finish a sampling number in the cycle according to the sampling rate that receives, after the data of the complete power frequency period of every collection, data communication device in the RAM is crossed wireless module send monitoring base station, monitoring base station is by the wireless module receiver voltage, current measurement data also deposits database in, continue the reading out data database data, calculate electric capacity and the dielectric loss of every electric capacity and preserve database, last reading out data database data also is sent to the remote monitoring center monitoring host computer with result of calculation, thereby finishes once complete sampling process.
About remote monitoring center: comprise monitoring host computer, by wired mode such as optical fiber or RS485 interface twisted-pair feeder, wireless mode such as built-in GPRS network module receive the electrical substation monitoring base station data and utilize ORACLE database software archive management, utilize B/S (Browser/Server) pattern to realize that long-range historical data and fault diagnosis result are inquired about, warning function, all adopt prior art, do not give unnecessary details.
The remote monitoring center monitoring host computer is to the fault diagnosis of electrical substation monitoring data: to same capacitance data carry out historical comparison, capacitance data laterally reaches respectively vertical contrast on the same group, behind the variable quantity of comprehensive assessment capacitive insulation parameter, to the capacitor proposition fault warning of variable quantity greater than certain value.
Be defined as example with Southern Power Grid Company " power equipment preventive trial rules ", capacitance fault warning condition is set is:
1) sends out off-limit alarm when Cl≤0.95Cn timer.
2) send out off-limit alarm when Cl 〉=1.1Cn timer.
3) 95%Cn＜Cl＜1.1Cn timer is not sent out off-limit alarm.
(wherein Cn is the capacitance factory-said value, and Cl is the capacitor sample value).
The utility model adopts short distance first, low-power, wireless communication technology is finished the compensation condenser group capacitance voltage that transformer station is installed concentratedly, control and data transfer that the current signal wireless synchronization gathers, avoided cable to lay, greatly reduce difficulty and system's installation cost of construction, solve capacitor group in centralized arrangement and installed in a large number the investment that network communication module and GPS module may be brought additional, expense and powerup issue, realized image data between measuring unit and the base station continuously, safety, the isolation transmission, can continuous monitoring capacitor operating condition, and to unusual electric capacity proposition fault warning, guaranteed the security of operation of converting station electric power system.
Claims (2)
1. the transformer station's electric capacity on-Line Monitor Device based on wireless mode is characterized in that, comprising:
Current measuring unit: comprise at least the little electric current CT of punching, with microprocessor, supply module and the wireless module of A/D conversion; The little electric current CT of described punching is socketed on and is used for the coupling capacitance working current on the capacitor high voltage side wire, its two-way is exported one the tunnel and is connected to microprocessor A/D conversion input end for current sample, another road is connected to supply module carries out exporting the electric energy power supply after the rectifying and wave-filtering voltage stabilizing, and described microprocessor connects wireless module;
Voltage measurement unit: be installed in the secondary side output terminal of capacitor set discharge PT, comprise at least microprocessor, power module and wireless module with the A/D conversion; The secondary side output terminal one tunnel of discharge PT is connected to microprocessor A/D conversion input end and is used for voltage sample, and another road is connected to power module carries out exporting the electric energy power supply after the rectifying and wave-filtering voltage stabilizing, and described microprocessor connects wireless module;
Monitoring base station: arrange on the spot in transformer station, comprise at least computing machine and wireless module, computing machine sends order and receives measurement data to current measuring unit and voltage measurement unit by connected wireless module; And result of calculation is sent to remote monitoring center;
Remote monitoring center: comprise monitoring host computer, receive the electrical substation monitoring base station data.
2. the transformer station's electric capacity on-Line Monitor Device based on wireless mode as claimed in claim 1, described monitoring base station also includes a fixed phase module and an interface module; Described fixed phase module input computer CPU; Described interface module disposes wired RS485 interface, optical fiber interface or wireless GPRS mixed-media network modules mixed-media, is used for computer CPU output is sent to remote monitoring center by wired or wireless mode.
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| CN 201220216683 CN202903892U (en) | 2012-05-15 | 2012-05-15 | A transformer station capacitance on-line monitoring device based on a wireless mode |
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| CN 201220216683 CN202903892U (en) | 2012-05-15 | 2012-05-15 | A transformer station capacitance on-line monitoring device based on a wireless mode |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103698584A (en) * | 2014-01-08 | 2014-04-02 | 广州思泰信息技术有限公司 | Power distribution network overhead line three-phase current sampling synchronization method |
| CN104730343A (en) * | 2015-03-18 | 2015-06-24 | 中电科技电子信息系统有限公司 | High voltage electricity capacitive equipment dielectric loss on-line monitoring method and monitoring system |
| CN110244109A (en) * | 2019-07-05 | 2019-09-17 | 杭州西湖电子研究所 | A kind of wide area end shield earth current three-dimensional figure spectrum expression |
| CN110244107A (en) * | 2019-07-05 | 2019-09-17 | 杭州西湖电子研究所 | A kind of wide area end shield earth current two-dimensional map expression |
| CN112345865A (en) * | 2020-11-10 | 2021-02-09 | 内蒙古科技大学 | Power capacitor running state online evaluation early warning device and method |
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2012
- 2012-05-15 CN CN 201220216683 patent/CN202903892U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698584A (en) * | 2014-01-08 | 2014-04-02 | 广州思泰信息技术有限公司 | Power distribution network overhead line three-phase current sampling synchronization method |
| CN103698584B (en) * | 2014-01-08 | 2016-02-24 | 广州思泰信息技术有限公司 | A kind of distribution network overhead line three-phase current sampling synchronization method |
| CN104730343A (en) * | 2015-03-18 | 2015-06-24 | 中电科技电子信息系统有限公司 | High voltage electricity capacitive equipment dielectric loss on-line monitoring method and monitoring system |
| CN110244109A (en) * | 2019-07-05 | 2019-09-17 | 杭州西湖电子研究所 | A kind of wide area end shield earth current three-dimensional figure spectrum expression |
| CN110244107A (en) * | 2019-07-05 | 2019-09-17 | 杭州西湖电子研究所 | A kind of wide area end shield earth current two-dimensional map expression |
| CN110244107B (en) * | 2019-07-05 | 2021-12-07 | 杭州西湖电子研究所 | Wide-area end screen grounding current two-dimensional map expression method |
| CN112345865A (en) * | 2020-11-10 | 2021-02-09 | 内蒙古科技大学 | Power capacitor running state online evaluation early warning device and method |
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