CN102628727A - Vibration monitoring system for transformer - Google Patents
Vibration monitoring system for transformer Download PDFInfo
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Abstract
The invention provides a vibration monitoring system for a transformer. The vibration monitoring system comprises six vibration sensors which are respectively arranged at six vibration test points of the transformer. An output signal joint of each vibration sensor is connected with an input signal joint of a signal conditioning module; six signal output channels of the signal conditioning module are connected with six signal input channels of a multi-channel A/D (Analogue/Digital) converter; one signal output channel of the signal conditioning module is connected with one signal input channel of a comparer; a signal output channel of the comparer is connected with a control signal input channel of the main control module; a control signal output channel of the main control module is connected with a signal input channel of a D/A (Digital/Analogue) converter in a triggering module; and a data bus of the multi-channel A/D converter is connected with a data bus of the main control module and a data bus of an SRAM (Static Random Access Memory). With the adoption of the vibration monitoring system provided by the invention, the synchronous data collection of the vibration signals of the transformer can be realized by utilizing technology of multiplexing a power supply and a signal wire. The working stability of the vibration sensors can be ensured, and the anti-jamming capability of signals is enhanced, so that the harmonic wave of the transformer at each frequency can be actually reflected by output signals, and the measurement precision of the data is higher.
Description
Technical field
The present invention relates to electrical Equipment On-Line Monitoring System, particularly a kind of transformer vibration monitor system.
Background technology
Transformer receives the influence of external environment factor in the long-time running process, various faults can occur inevitably, thereby influences the transformer operate as normal, as fails in time to find and take suitable reclamation activities, then constantly development of defective, thus accidents caused.Whole measuring system and electric system did not have the characteristics such as safe and reliable that are electrically connected when vibration monitoring was installed simple, sensitive monitoring, on-line monitoring with it; Overcome the deficiency of classic method, on the situation of winding of monitoring transformer and iron core, shown bright development prospect.Therefore, use the reliability that vibratory drilling method monitoring power transformer not only can improve Operation of Electric Systems, and the scientific-technical progress of power industry is had important scientific value.Existing transformer vibration monitoring device can not carry out synchronous data collection to all passages mostly, thereby when analyzing monitor signal, the precise time that fault-signal is arrived each detecting sensor is difficult to confirm, and on-the-spot interference free performance is relatively poor.
This paper adopts the multi-channel synchronous Sampling techniques, avoids above-mentioned defective thereby come that vibration signal is carried out synchronous data collection.Adopt linear optical coupling to isolate the transmission vibration signal simultaneously, improved the interference free performance of system greatly.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned prior art, a kind of transformer vibration monitor system be provided,
Utilize vibration transducer to be transformed into electric signal to the vibration signal on the transformer case, the signal condition module is that vibration transducer provides steady current, makes the vibration transducer operate as normal, simultaneously the DC component in the separating vibration sensor output signal; Trigger module is dynamically set the threshold values of vibration signals collecting according to actual conditions, and trigger module outputs signal to main control module when vibration signal surpasses threshold voltage, and Vibration on Start-up signals collecting flow process.Multi-channel synchronous A/D converter completion transformer vibration monitor system (hereinafter to be referred as: the synchronous digital of each passage vibration signal conversion IED); Main control module is accomplished data acquisition, storage, the analysis of total system, and analysis result is seen off with the IEC61850 standard format; Optical fiber/Ethernet interface is a standard communication interface, accomplishes IED and is connected with the communication of other system.
Technical solution of the present invention is following:
A kind of transformer vibration monitor system, characteristics are that its formation comprises: six vibration transducers, signal condition module, trigger module, multi-channel a/d converter, main control module, outside industrial computer and high speed static cache modules (SRAM); The annexation of above-mentioned parts is following:
Described six vibration transducers are arranged at respectively on six vibration-testing points of transformer to be measured; The output Signal connector of each vibration transducer links to each other with the input signal joint of described signal condition module respectively; Six road signal output channels of this signal condition module and six road signal input channels of described multi-channel a/d converter are connected; One road signal output channels of this signal condition module is connected with one road signal input channel of comparer in the described trigger module; The comparator signal output channel is connected with the control signal input channel of main control module in this trigger module; The control signal output channel of described main control module is connected with the signal input channel of D/A converter in the trigger module; The simulating signal output channel of D/A converter is connected with one road signal input channel of said comparer in the described trigger module; The data bus of described multi-channel a/d converter links to each other with the data bus of the data bus of main control module, SRAM, and the passage control interface of main control module is connected with the passage control interface of SRAM, and the Ethernet interface of main control module is connected with described outside industrial computer or communication apparatus with optical fiber interface.
Described signal condition module comprises that signal acquisition module and Signal Spacing filtration module two parts constitute:
Said signal acquisition module comprises the adjustable voltage stabilizing integrated chip of three ends; The 3rd port of this integrated chip connects the positive pole of 24V direct supply; The positive pole of this 24V direct supply is through power filtering capacitor ground connection; Connect first resistance between the 1st port of this integrated chip and the 2nd port; The 2nd port of this integrated chip is successively through second electric capacity and second resistance eutral grounding, and the two ends that are connected across the vibration transducer interface after described second electric capacity and the series connection of second resistance constitute to exchange to hold and hinder bleeder circuit, and the node of described second electric capacity and second resistance is the signal output part (SignalOut) of described vibration transducer; The described integrated chip and first resistance are formed constant current source, for described vibration transducer provides stable 24V direct supply;
Described Signal Spacing filtration module: buffer circuit and appearance resistance filtering two parts of mainly being made up of linear optical coupling are formed.
In the adjustable voltage stabilizing integrated chip of described three ends is LM317.
Compared with prior art, technique effect of the present invention is following:
1. select 16 multi-channel synchronous A/D converters of 6 passages for use; Synchronized sampling ability with 6 channel voltage current signals: existing transformer vibration monitoring device can not carry out synchronous data collection to all passages mostly; Thereby when analyzing monitor signal; The precise time that fault-signal is arrived each detecting sensor is difficult to confirm, and the present invention adopts the multi-channel synchronous Sampling techniques, avoids above-mentioned defective thereby come that vibration signal is carried out synchronous data collection.Simultaneously the multi-channel synchronous A/D converter has high SNR, HDR, and the highest speed that can 200kHz is sampled, and under high-precision requirement, can realize over-sampling, has very high resolution, is enough to satisfy the requirement of measuring vibrations signal.
2. in the signal condition module; Signal condition to vibration transducer has adopted power supply and signal wire multiplex technique; Steady current output through constant current source; Guarantee the working stability of vibration transducer, also strengthened the antijamming capability of signal simultaneously greatly, made the output signal can truly reflect the harmonic wave of each frequency of transformer.
3. the measurement data precision is high: adopted aggregate measures such as the method for high-precision vibration transducer, synchronized sampling, high-precision ADC, guaranteed the precision of vibration survey.
4. the data analysis result of whole vibration IED is with the standard format output of IEC61850 agreement; OO thought and advanced technology have been adopted in the communication based on the IEC61850 standard; Not only standard communication process; Even system model also carried out the portrayal of certain depth, make great efforts to make the compatibility between main station system, the transformer vibration monitor system to develop to higher direction.
5.WEB the form distributing data can be realized remote browse.Have Ethernet and optical fiber interface simultaneously, can long-rangely be connected, and can realize that timing automatic collection regularly automatically, interior image data of recording prescribed time, remote manual start measurement with main station system.
Description of drawings
Fig. 1 is the structural representation of depressor vibration monitor system of the present invention.
Fig. 2 is power supply signal multiplex circuit figure in the signal condition module of the present invention.
Fig. 3 is a Signal Spacing filtration module circuit diagram in the signal condition module of the present invention.
Fig. 4 is a trigger module circuit diagram of the present invention.
Fig. 5 is the circuit diagram of comparer in the trigger module of the present invention.
Fig. 6 is a multi-channel synchronous AD converter circuit diagram of the present invention.
Fig. 7 is a main control module circuit diagram of the present invention.
Fig. 8 is memory circuitry figure in the main control module of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described further, but should limit protection scope of the present invention with this.
Please consult Fig. 1 earlier; Fig. 1 is the structural representation of depressor vibration monitor system of the present invention; As shown in the figure; Transformer vibration monitor system of the present invention comprises: six vibration transducers 1, signal condition module 2, trigger module 3, multi-channel a/d converter 4, main control module 5, outside industrial computer 6 and high speed static cache modules 7; The annexation of above-mentioned parts is following:
Described six vibration transducers 1 are arranged at respectively on six vibration-testing points of transformer to be measured; The output Signal connector of six vibration transducers 1 links to each other with six input signal joints of described signal condition module 2 respectively; Six road signal output channels of this signal condition module 2 link to each other with six road signal input interfaces of described multi-channel a/d converter 4; One road signal output channels of this signal condition module 2 also is connected with one road signal input channel of comparer 32 in the described trigger module 3; The signal output channels of described comparer 32 is connected with the control signal input channel of described main control module; The control signal output channel of described main control module 5 is connected with the signal input channel of D/A converter 31 in the trigger module 3; The simulating signal output channel of D/A converter 31 is connected with one road signal input channel of said comparer 32 in the described trigger module; The data bus of described multi-channel a/d converter 4 links to each other with the data bus of main control module 5, the data bus of high speed static cache module 7 simultaneously; The passage control interface of described main control module 5 is connected with the passage control interface of high speed static cache module 7, and the Ethernet interface of main control module 5 is connected with described outside industrial computer 6 or communication apparatus with optical fiber interface.
Vibration transducer 1: because transformer vibrational energy frequency spectrum is generally below 1KHz; The vibration transducer of present embodiment is selected the LT0106T of Lanace company for use; Its frequency range is 0.04-1500Hz, and resolution is 0.00002g, and sensitivity is 1000mV/g; Range is 5g, is enough to satisfy the measurement requirement to the transformer vibration signal.
Signal condition module 2: constitute by signal acquisition module and Signal Spacing filtration module two parts.Signal acquisition module is mainly used in to vibration transducer 1 power supply, obtains the output signal of vibration transducer 1 simultaneously; The Signal Spacing filtration module is mainly accomplished the isolation transmission and the filtering of simulating signal, to eliminate under the rugged surroundings electromagnetic signal to the interference of system.
Signal acquisition module: because LT0106T belongs to ICP type sensor, need to adopt constant current source power supply, service cable is exported the Low ESR signal simultaneously as output line.The driving voltage of LT0106T is 24VDC, and required steady current is 2-20mA, and representative value is 4mA; Therefore be required to be constant current source that LT0106T provides a 4mA as excitation; The dc offset voltage of isolating LT0106T output simultaneously, according to above-mentioned requirements, the signal condition modular circuit of design.Fig. 2 is power supply signal multiplex circuit figure in the signal condition module of the present invention; Fig. 3 is a Signal Spacing filtration module circuit diagram in the signal condition module of the present invention; As shown in the figure; Signal acquisition module comprises the adjustable voltage stabilizing integrated chip of three ends U1, and the 3rd port of this integrated chip U1 connects the positive pole of 24V direct supply, and the positive pole of this 24V direct supply is through power filtering capacitor C1, E1 ground connection; Connect first resistance R 1 between the 1st port of this integrated chip U1 and the 2nd port; The 2nd port of this integrated chip U1 is successively through second capacitor C 2 and second resistance R, 2 ground connection, and the two ends that are connected across vibration transducer interface J1 after described second capacitor C 2 and 2 series connection of second resistance R constitute and exchange appearance and hinder bleeder circuit, and the node of described second capacitor C 2 and second resistance R 2 is the signal output part SignalOut of described vibration transducer 1; The described integrated chip U1 and first resistance R 1 are formed constant current source, for described vibration transducer 1 provides stable 24V direct supply; Three ends are adjustable, and voltage stabilizing integrated chip (U1) is LM317.
C1, E1 are power filtering capacitor, and for the input of LM317 provides stable 24V voltage, U1 and R1 form constant current source, and its continuous current determines by R1, establish the constant current source output current and be I then its value suc as formula shown in 1.
I＝1.2/R1 (1)
When the R1 value was 300 ohm, its constant current source was output as 4mA.C2 and R2 series connection back cross-over connection constitutes in J1 (vibration transducer interface) two ends to exchange holds the resistance bleeder circuit, and the DC component of J1 two ends output is isolated, because therefore the R2 impedance, can think that the R2 voltage is the AC compounent that sensor is exported much larger than C1.
The Signal Spacing filtration module: buffer circuit and appearance resistance filtering two parts of mainly being made up of linear optical coupling are formed, and Fig. 3 is a Signal Spacing filtration module circuit diagram in the signal condition module of the present invention.U10 is current drive-type optocoupler HCNR201 among the figure; Its principle of work is; The LED externally driving of electric current is launched the light of certain light intensity down; When photodiode PD1, PD2 received the exciting light that same LED sends, the last electric current of PD1, PD2 was identical, can accomplish the isolation transmission of signal according to above-mentioned characteristic.U12A is operational amplifier LM358, and it is output as, and LED provides exciting current among the U10, R12, PD1 ,+6V4DCI and-6V4DCI constitutes negative-feedback circuit, makes U12A inverting input voltage follow input voltage SignalOut.When input voltage SignalOut changed, U12A changed and to output to the electric current in the LED, equal input voltage SignalOut to inverting input voltage till.+ 5VDC, PD2, R13 and C10 form the Signal Spacing acquisition cuicuit jointly, because the last electric current of PD1, PD2 is identical, R13 chooses the isolation transmission that suitable resistance value can be accomplished signal.U11, R14, R15 constitute in-phase amplifier, and enlargement factor is 2 times, and R11 and C11 constitute low-pass filter, the signal beyond the filtering useful band.
Trigger module 3: comprise D/A converter 31 and comparer 32.Trigger module is accomplished the transfinite function of triggering collection of the dynamic setting of vibration signal threshold values and threshold values.Fig. 4 is a trigger module circuit diagram of the present invention; As shown in the figure; U20 is a SPI interface DA converter, and wherein: 1 pin is that digital input port, 2 pin are that input end of clock mouth, 3 pin are the reference voltage input mouth for selecting pin, 6 pin for use, is connected with C22 with filter capacitor E20.5 pin are the analog output mouth that power port, 4 pin and 7 pin are respectively DA for ground, 8 pin, and its output is behind the low-pass filter that voltage follower and R25, C24, R20, the C21 of U21A and U21B composition form, as the threshold voltage of trigger pip.
Fig. 5 is the circuit diagram of comparer in the trigger module of the present invention.Threshold values transfinites and triggers function and mainly accomplished by U22ALM393; Its 3 pin meets threshold value setting signal VrefChl0; Vibration signal AccAnaInput0 delivers to 2 pin of U22A after isolating transmission, filtering; As AccAnaInput0 during greater than VrefChl0, it is low level that U22 makes ARM_TrgCh0, thereby triggers HSDA.
Fig. 6 is a multi-channel synchronous AD converter circuit diagram of the present invention, and 3,4, No. 5 pins are the over-sampling selecting side among the figure, respectively with main control module in the corresponding over-sampling of LPC2292 select output pin to link to each other, carry out over-sampling and select; No. 6 pin is selected for the AD7606-6 interface mode, selects the parallel way of output when connecing low level, connects high level and selects serial output mode, connects low level among the present invention and selects parallel mode; Whether No. 7 pins are hung up by master control module controls AD7606-6 for hanging up pin, and low level is effective; No. 8 pins are that RANGE selects input end, connect 100K resistance R 500 ground connection, link to each other with the AD_RangeSel pin of main control module LPC2292 simultaneously; When the RANGE input end is low level; Sample range is ± 5V that when the RANGE input end was high level, sample range was ± 10V; No. 23 pins are V
DRIEPin adopts 3.3V; 9, No. 10 pins are first three road, back three tunnel SF input pins; No. 11 pin are the RST pin, before the AD7606-6 operate as normal, need carry out reset operation to it, are controlled by main control module; 12,13 pin are respectively read signal input pin and the chip selection signal input pin of AD7606-6 when reading control data; No. 14 pin are for interrupting output pin, and each sampling is accomplished, and AD7606-6 will export look-at-me notice LPC2292 sampling and finish; No. 15 pin is a FirstData sign pin, is used for serial output mode and plays the mark effect; 44,45 pin are respectively first three road, back three road reference capacitance pins, meet pin AGND No. 46 after connecing 10uF capacitor C 504, guarantee reference voltage waveform stabilization in the sampling process.
Main control module 7: mainly form by master cpu LPC2292, memory I S61WV102416BLL and 61850 stipulations modular converters.Fig. 7 is a main control module circuit diagram of the present invention, and Fig. 8 is memory circuitry figure in the main control module of the present invention.Can know that by figure J40, R40, R41, R41, R45 and C40 form program download interface and the system power-on reset circuit of U40 jointly.42 and 49 pin are the serial communication port, mainly communicate by letter with 61850 stipulations modular converters.33 pin and 99 pin are the trigger pip input port, and when trigger pip, by LPC2292 log-on data sampling routine, 59,61,68 and 12 pin constitute the SPI COM1, and master cpu is mainly set threshold values through the SPI port to the output of DA converter.100 pin are AD conversion finishing signal, when it is low level, show the AD EOC, and master cpu sequential according to the rules reads the AD conversion value.C43, C44, JT40 and R45 constitute the running clock of master cpu, for system provides stabilizing clock.Exi_DATA0-15 system data line, AD_RangeSel, AD_RST, AD_nSTBY, AD_OverSmpl0-2 and AD_FstData are in AD converter part by the agency of.Xi_ADD0-23 is the system address line.Exi_nRD, Exi_nWR are respectively read-write control signal.CS_SRAM and AD_CS are respectively the select lines of storer and AD converter.61850 stipulations modular converters are mainly accomplished the generation of 61850 standard signals with OK6410 embedded development plate, and through network interface Information Monitoring are sent.
The concrete course of work of transformer vibration monitor system of the present invention is following:
The timing automatic measurement regularly automatically of transformer vibration monitor system also can manually boot measurement at any time, starts the vibration signal of six vibration-testing points of back synchro measure transformer.Start and measure back main control module output control signal to multi-channel a/d converter, multi-channel a/d converter is 6 signal sampling channels of gating simultaneously.Simultaneously main control module is exported the voltage control signal of certain amplitude according to predefined threshold values, is delivered to trigger module and generates threshold voltage.The signal condition module is that vibration transducer provides steady current, makes normal operation of sensor, is delivered to 6 signal sampling channels of multi-channel a/d converter after the voltage signal process signal condition module of No. 6 vibration transducers.When vibration transducer gets into trigger module 3 through one tunnel output signal of signal condition module; Compare through described comparer and described threshold voltage; When surpassing threshold voltage, trigger module output acquisition controlling signal is to described main control module, this main control module Vibration on Start-up signals collecting flow process.
During the Vibration on Start-up signals collecting, the digital signal that described multi-channel a/d converter collects deposits in earlier among the SRAM7, after gathering end, by main control module data is read.After main control module adopts overall treatments such as digital filtering, first-harmonic extraction, phase place discriminating to the vibration voltage signal data that collects, data such as the 50Hz fundamental vibration frequency component of 6 vibration-testing points of calculating transformer, 100Hz oscillating component, 200Hz oscillating component, 300Hz oscillating component, 400Hz oscillating component.Preserve the gained data, regularly upload data through 61850 stipulations with the WEB form simultaneously, realize the remote data transmission of transformer vibration monitor system monitoring transformer of the present invention vibration, can long-rangely check checking and analyzing of data to main station system.
Claims (4)
1. a transformer vibration monitor system is characterised in that its formation comprises: six vibration transducers (1), signal condition module (2), trigger module (3), multi-channel synchronous A/D converter (4), main control module (5), outside industrial computer (6) and high speed static cache module (7); The annexation of above-mentioned parts is following:
Described trigger module (3) is made up of D/A converter (31) and comparer (32); Described six vibration transducers (1) are arranged at respectively on six vibration-testing points of transformer to be measured; The signal output connector of six vibration transducers (1) links to each other with six signal input connectors of described signal condition module (2) respectively; Six road signal output channels of this signal condition module (2) are connected with six road signal input channels of described multi-channel synchronous A/D converter (4), and one road signal output channels of this signal condition module (2) is connected with one road signal input channel of described comparer (32);
The signal output channels of comparer (32) is connected with the control signal input channel of main control module in this trigger module (3); The control signal output channel of described main control module (5) is connected with the signal input channel of described D/A converter (31); The simulating signal output channel of described D/A converter (31) is connected with one road signal input channel of said comparer (32); First data bus of described multi-channel a/d converter (4) links to each other with the data bus of main control module (5), second data bus of this multi-channel a/d converter (4) links to each other with the data bus of high speed static cache module (7); The passage control interface of described main control module (5) is connected with the passage control interface of high speed static cache module (7), and the Ethernet interface of described main control module (5) is connected with described outside industrial computer (6) or communication apparatus with optical fiber interface.
2. transformer vibration monitor system according to claim 1 is characterized in that described signal condition module (2) comprises that signal acquisition module and Signal Spacing filtration module two parts constitute:
Said signal acquisition module comprises the adjustable voltage stabilizing integrated chips of three ends (U1); The 3rd port of this integrated chip (U1) connects the positive pole of 24V direct supply; The positive pole of this 24V direct supply is through power filtering capacitor (C1, E1) ground connection; Connect first resistance (R1) between the 1st port of this integrated chip (U1) and the 2nd port; The 2nd port of this integrated chip (U1) is successively through second electric capacity (C2) and second resistance (R2) ground connection; The two ends that are connected across vibration transducer interface (J1) after the series connection of described second electric capacity (C2) and second resistance (R2) constitute to exchange to hold and hinder bleeder circuit; The node of described second electric capacity (C2) and second resistance (R2) is the signal output part (SignalOut) of described vibration transducer (1), and described integrated chip (U1) and first resistance (R1) are formed constant current source, for described vibration transducer (1) provides stable 24V direct supply;
Described Signal Spacing filtration module: buffer circuit and appearance resistance filtering two parts of mainly being made up of linear optical coupling are formed.
3. transformer vibration monitor system according to claim 2 is characterized in that the adjustable voltage stabilizing integrated chips of described three ends (U1) are LM317.
4. transformer vibration monitor system according to claim 1, the frequency range that it is characterized in that described vibration transducer (1) is 0.04-1500Hz, and resolution is 0.00002g, and sensitivity is 1000mV/g, and range is 5g.
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| CN104125016A (en) * | 2014-07-23 | 2014-10-29 | 南车株洲电力机车研究所有限公司 | Ethernet fiber interface circuit |
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| CN109448971A (en) * | 2018-12-11 | 2019-03-08 | 国网山西省电力公司临汾供电公司 | Distribution transforming connector is quickly disconnected for distribution transformer |
| CN109448971B (en) * | 2018-12-11 | 2024-02-06 | 国网山西省电力公司临汾供电公司 | Quick-dismantling and assembling transformer joint for distribution transformer |
| CN110763964A (en) * | 2019-11-12 | 2020-02-07 | 保定天威新域科技发展有限公司 | Operating voltage phase triggering wireless device based on transformer vibration |
| CN110763964B (en) * | 2019-11-12 | 2022-04-12 | 国网新疆电力有限公司乌鲁木齐供电公司 | Operating voltage phase triggering wireless device based on transformer vibration |
| CN110837241A (en) * | 2019-11-22 | 2020-02-25 | 中国电子科技集团公司第五十八研究所 | SIP-based sampling processing system |
| CN110837241B (en) * | 2019-11-22 | 2021-03-30 | 中国电子科技集团公司第五十八研究所 | SIP-based sampling processing system |
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Application publication date: 20120808 |