CN104950164A - Lightning overvoltage monitoring system for substation secondary system - Google Patents
Lightning overvoltage monitoring system for substation secondary system Download PDFInfo
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Abstract
A lightning overvoltage monitoring system for a substation secondary system is characterized in that a low-damping series resistance-capacitance divider acquires a surge overvoltage signal, a parallel resistance-capacitance divider divides voltage of the surge overvoltage signal, voltage amplitude of surge overvoltage is lowered, part of an overvoltage division signal enters a trigger circuit for overvoltage judging, whether overvoltage signal acquisition is required or not is determined, the other part of the overvoltage division signal enters a signal processing circuit for impedance isolation and low-pass filtering, when triggered, a data acquisition card acquires an overvoltage signal output by the signal processing circuit and transmits the overvoltage signal to a background computer for overvoltage waveform statistics and analysis, action reliability of an arrestor is judged according to analysis results, maintenance for the arrestor of the substation secondary system is thus guided, and running safety and normality of the substation secondary system is ensured.
Description
Technical field
The present invention relates to superpotential on-line monitoring technique field, particularly relate to a kind of transformer station secondary system Lightning Over-voltage monitoring system.
Background technology
Under superpotential refers to power frequency, alternating voltage root-mean-square value raises, 10% of overrate, and the long-time variation in voltage phenomenon that the duration is greater than 1 minute.Superpotential divides external overvoltage and the large class of internal overvoltage two, and external overvoltage is lightning surge.In order to prevent lightning surge from destroying the primary equipment of transformer station and secondary device etc., generally zinc oxide surge arresters on the primary system of transformer station, electrical secondary system installs surge arrestor.Because there is numerous Control protection equipment in transformer station, lightning arrester is arranged on power supply or the signal wire porch of these equipment, and mounting points is many and hidden, is difficult to find when operations staff makes an inspection tour, and Lightning Over-voltage on-line monitoring technique just seems particularly important thus.
Current superpotential on-line monitoring technique or system are all for primary system or equipment (transient overvoltage of strong power system).But electrical secondary system is weak electricity system, due to reasons such as over-voltage waveform dispersion are large and the duration is very short, for primary system or equipment superpotential on-line monitoring technique and be not suitable for the over-voltage monitoring of electrical secondary system, and up to now, both at home and abroad also not about the report of the superpotential on-line monitoring pertinent literature of electrical secondary system.
Summary of the invention
Based on this, be necessary for the problems referred to above, a kind of transformer station secondary system Lightning Over-voltage monitoring system be provided, the on-line monitoring of transformer station secondary system Lightning Over-voltage can be realized.
A kind of transformer station secondary system Lightning Over-voltage monitoring system, comprises low resistance capacitance-resistance series voltage divider, capacitance-resistance parallel voltage divider, trigger circuit, signal processing circuit, data collecting card, background computer; Capacitance-resistance parallel voltage divider input end is connected with low resistance capacitance-resistance series voltage divider output terminal, and output terminal is connected with trigger circuit input end, signal processing circuit input end respectively; Data collecting card one end is connected with trigger circuit output terminal, signal processing circuit output terminal respectively, and the other end is connected with background computer;
Low resistance capacitance-resistance series voltage divider obtains the overvoltage surge signal of transformer station secondary system, and is transferred to capacitance-resistance parallel voltage divider; Capacitance-resistance parallel voltage divider carries out dividing potential drop to overvoltage surge signal, obtains superpotential voltage division signal, and superpotential voltage division signal is transferred to trigger circuit and signal processing circuit respectively; Signal processing circuit carries out impedance isolation and low-pass filtering to superpotential voltage division signal, and by the overvoltage signal input data collecting card after low-pass filtering; Superpotential voltage division signal and default threshold voltage compare by trigger circuit, and when superpotential voltage division signal exceedes threshold voltage, trigger data acquisition card gathers the overvoltage signal that signal processing circuit exports; The overvoltage signal of collection is sent to background computer by data collecting card; Background computer is analyzed the overvoltage signal gathered, and judges the Reliability of Microprocessor of lightning arrester according to the result analyzed.
Transformer station secondary system Lightning Over-voltage monitoring system of the present invention, low resistance capacitance-resistance series voltage divider obtains overvoltage surge signal, capacitance-resistance parallel voltage divider is to overvoltage surge signal dividing potential drop, reduce the voltage magnitude of overvoltage surge, superpotential voltage division signal one tunnel enters trigger circuit and carries out superpotential judgement, determine whether to need overvoltage signal collection, another road entering signal treatment circuit carries out impedance isolation and low-pass filtering, data acquisition gathers the overvoltage signal that signal processing circuit exports when being stuck in trigger state, and be transferred to background computer carry out over-voltage waveform statistics with analyze, then the reliability of lightning arrestor movement is judged according to the result analyzed, thus the maintenance of the lightning arrester instructing transformer station secondary system to install, ensure that the safety of transformer station secondary system is normal to run.
Accompanying drawing explanation
Fig. 1 is the structural representation of present system embodiment one;
Fig. 2 is the structural representation of trigger circuit embodiment of the present invention;
Fig. 3 is the structural representation of signal processing circuit embodiment of the present invention;
Fig. 4 is the structural representation of present system embodiment two;
Fig. 5 is that present system specifically implements framework schematic diagram.
Embodiment
In order to understand technical matters, the technical scheme taked and the technique effect reached that the present invention solves more clearly, below in conjunction with accompanying drawing, embodiments of systems of the invention are described in detail.
As shown in Figure 1, a kind of transformer station secondary system Lightning Over-voltage monitoring system, comprises low resistance capacitance-resistance series voltage divider 100, capacitance-resistance parallel voltage divider 200, trigger circuit 300, signal processing circuit 400, data collecting card 500, background computer 600; Capacitance-resistance parallel voltage divider 200 input end is connected with low resistance capacitance-resistance series voltage divider 100 output terminal, and output terminal is connected with trigger circuit 300 input end, signal processing circuit 400 input end respectively; Data collecting card 500 one end is connected with trigger circuit 300 output terminal, signal processing circuit 400 output terminal respectively, and the other end is connected with background computer 600;
Low resistance capacitance-resistance series voltage divider 100 obtains the overvoltage surge signal of transformer station secondary system, and is transferred to capacitance-resistance parallel voltage divider 200; Capacitance-resistance parallel voltage divider 200 pairs of overvoltage surge signals carry out dividing potential drop, obtain superpotential voltage division signal, superpotential voltage division signal are transferred to respectively trigger circuit 300 and signal processing circuit 400; Signal processing circuit 400 pairs of superpotential voltage division signal carry out impedance isolation and low-pass filtering, and by the overvoltage signal input data collecting card 500 after low-pass filtering; Superpotential voltage division signal and default threshold voltage compare by trigger circuit 300, and when superpotential voltage division signal exceedes threshold voltage, the overvoltage signal that trigger data acquisition card 500 pairs of signal processing circuits 400 export gathers; The overvoltage signal of collection is sent to background computer 600 by data collecting card 500; Background computer 600 is analyzed the overvoltage signal gathered, and judges the Reliability of Microprocessor of lightning arrester according to the result analyzed.
A very important link to the design of voltage divider.The precision of voltage divider directly affects the precision of whole monitoring system, and the amplitude of overvoltage surge signal is very high and the time is short, so not only need the precision problem considering voltage divider when choosing voltage divider, also needs to consider Frequency Response problem.In addition, voltage divider choose the reliability also needing to consider its long-time running, the problems such as heating, impedance matching.Pure resistance voltage divider not only has amplitude error and phase error, and also has the problem of heating, is not suitable for long-time running.Although pure capacitive divider does not have the problem of generating heat, and only has amplitude error, due to stray inductance, high frequency oscillation can be produced unavoidably.So the present invention adopts low resistance capacitance-resistance series voltage divider 100 to obtain overvoltage surge signal, low resistance capacitance-resistance series voltage divider 100 good frequency response, sampling rate and precision high, meet the testing requirement of overvoltage surge.
Higher from low resistance capacitance-resistance series voltage divider 100 signal amplitude out, exceed the maximum input voltage of electronic component, need to carry out second divided voltage.Second divided voltage will ensure the accuracy of waveform, so capacitance-resistance parallel voltage divider 200 pairs of overvoltage surge signals can be adopted to carry out dividing potential drop, wherein capacitance-resistance parallel voltage divider 200 square-wave response at 10ns (nanosecond) below.
Trigger circuit 300 are for starting the sampling of data collecting card 500, as long as any phase voltage exceedes the threshold voltage preset, A/D (analog/digital) converter with regard to trigger data acquisition card 500 carries out overvoltage signal sampling, otherwise is in waiting status.In addition, impedance and the whole loop of trigger circuit 300 of trigger circuit 300 keep apart, and adopt high speed optoelectronic to isolate, and signal noise is less.
Due to the randomness of overvoltage surge, cannot determine in advance superpotential polarity occurs, so as shown in Figure 2, described trigger circuit 300 comprise the first voltage comparator 3001, second voltage comparator 3002, phase inverter 3004, photoelectrical coupler 3005 and logical and not gate 3006.It should be noted that, first, second does not do to limit to the order of voltage comparator and quantity, triggering is compared for positive polarity voltage just to distinguishing a voltage comparator, another voltage comparator is used for reverse voltage and compares triggering, voltage comparator can be CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor (CMOS)) voltage comparator.
First voltage comparator 3,001 one input end is connected with capacitance-resistance parallel voltage divider 200 output terminal, and another input end is connected with providing the reference voltage source 3003 of threshold voltage, and output terminal is connected with photoelectrical coupler 3005 input end; Second voltage comparator 3,002 one input end is connected with capacitance-resistance parallel voltage divider 200 output terminal, and another input end is connected with reference voltage source 3003 by phase inverter 3004, and output terminal is connected with photoelectrical coupler 3005 input end; Photoelectrical coupler 3005 output terminal is connected with data collecting card 500 by logical and not gate 3006.
The superpotential voltage division signal that capacitance-resistance parallel voltage divider 200 exports divides two-way to enter trigger circuit 300, and trigger circuit 300 adopt dual comparator to form windows detecting circuit, realizes positive and negative polarity voltage compare and triggers.Voltage comparator 3001 datum for positive polarity is provided by reference voltage source 3003, to be exported by same reference voltage source 3003 for voltage comparator 3002 datum of negative polarity and provide through phase inverter 3004, realize positive and negative datum adjusted in concert thus.The signal that two voltage comparators export carries out light-coupled isolation through photoelectrical coupler 3005, wherein photoelectrical coupler have that volume is little, long service life, operating temperature range are wide, strong anti-interference performance, the contactless and constrained input feature such as completely isolated on electrically.Signal after light-coupled isolation is delivered to logical and not gate 3006 and is formed Trigger Logic level by photoelectrical coupler 3005, thus enters the external trigger passage of data collecting card 500, the data acquisition of control data capture card 500.
Signal processing circuit 400 mainly carries out impedance isolation and low-pass filtering to superpotential voltage division signal.As shown in Figure 3, described signal processing circuit 400 comprises and is connected to voltage follower 4001 between capacitance-resistance parallel voltage divider 200 and data collecting card 500 and active low-pass filter circuit 4002, and wherein voltage follower 4001 and active low-pass filter circuit 4002 are realized by operational amplifier.Operational amplifier can be selected high-speed low-power-consumption, drive the operational amplifier that load capacity is strong, the such as operational amplifier of AD817 model, even if the integrality etc. outputed signal still can be ensured when a driving bulky capacitor load, thus meets the requirement of over-voltage monitoring.
Voltage follower 4001 has very high input impedance and lower output impedance, and carrying load ability is strong, and superpotential voltage division signal enters active low-pass filter circuit 4002 after carrying out impedance isolation by voltage follower 4001.Desirable filtering circuit has the amplitude-frequency response of zero attenuation and linear phase response passband planted agent, and has infinitely-great amplitude fading stopband planted agent.The application's active low-pass filter circuit 4002 adopts Sallen-Key circuit, i.e. second order voltage controlled voltage source low-pass filter circuit, this filtering circuit passes through the low frequency signal from zero to a certain cutoff frequency ω H, to all frequencies being greater than ω H then significantly or complete attenuation, for ensureing the accuracy of waveform, general cutoff frequency gets high value.The overvoltage signal that active low-pass filter circuit 4002 exports is through signal cable input data collecting card 500.
Sampling thheorem describes will reappear original signal, and sampling rate must be greater than the twice of signal bandwidth, i.e. fs>2BW, and wherein fs is sampling rate, and BW is the bandwidth of signal.Above-mentioned relation ensures that sine wave that frequency is in bandwidth limit needs weekly to carry out the sampling of more than twice, determines theoretic minimum sample rate.In practical engineering application, higher sampling rate is needed accurately to present original signal.Electrical secondary system Lightning Over-voltage signal contains abundant radio-frequency component, and its frequency band reaches as high as tens of megahertz, so data collecting card 500 needs the equipment adopting sampling rate higher.
The overvoltage signal that data collecting card 500 gathers needs to be transferred to background computer 600 and carries out data analysis.As shown in Figure 4, present system can also comprise the communicator 700 be connected between data collecting card 500, background computer 600, and the overvoltage signal that data collecting card 500 gathers is transferred to background computer 600 by described communicator 700.Consider the factors such as the comparatively near and Overvoltage of on-line monitoring system communication distance can not frequently occur, communicator 700 can adopt ZigBee technology (ZigBee Technology) to carry out data transmission.ZigBee technology be a kind of closely, the high two-way wireless communication technology of low complex degree, low-power consumption, low rate, low cost, short time-delay, security, mainly being applicable to automatically control and remote control field, being Wireless Networking in order to meet small inexpensive equipment and control and the standard formulated.ZigBee technology communication distance from 75 meters of standard to hundreds of rice, several kilometers, and support infinite expanding, data transmission rate only has 20-250kb/s (kilobits per second) (2.4Grasshopper), meets the application requirement of lower rate transmissions data.Under low power consumption standby mode, 2 joints No. 5 dry cells can support 1 node work 6 ~ 24 months, and even longer, this is the outstanding advantage of ZigBee.It should be noted that, not concrete to communicator 700 transmission mode of the present invention is done to limit.
Superpotential data after background computer 600 is gathered by wave form analysis software analysis, analyze content and comprise waveform display, parameter measurement, spectrum analysis, Waveform storage, waveform printing, time measurement, superpotential generation moment record etc., the Reliability of Microprocessor of lightning arrester is judged according to the result analyzed, thus the tour of the lightning arrester instructing transformer station secondary system to install, maintenance, whether the design proposal assessing existing secondary lightning-protection system is reasonable, and provide Promotion Strategy etc., effectively ensure the safe operation of transformer station secondary system.
In order to ensure the normal operation of each equipment of present system, present system can also comprise power supply, thus provides the electric power needed for work for each equipment of system.Because each equipment operating voltage of monitoring system of the present invention is all ± 10v (volt) left and right substantially, working current is all milliampere level in addition, and power consumption is relatively low.And communicator 700 is according to ZigBee technology, power consumption is also lower, and power consumption when can estimate whole system work is very low.So the application uses lithium battery and DC/DC (DC-DC power supply) converter to combine the power supply built.This power supply structure is simple, can meet the proper device operation of each operating voltage, convenient mobile, dismounting.
As shown in Figure 5, for present system specifically implements framework schematic diagram.Monitoring terminal 510 obtains the surge over voltage signal of each lightning arrester of transformer station secondary system and carries out dividing potential drop, then two-way is divided to be transferred to trigger circuit and signal processing circuit, carry out superpotential judgement and signal transacting respectively, data acquisition is stuck in trigger circuit when being judged as superpotential, gathers the signal that signal processing circuit exports.The data that corresponding monitoring terminal 510 gathers by each data concentrator 520 are transferred to control center 540 by GPRS (general packet radio service technology), Internet (the Internet), fire wall 530.Data center 540 carries out the process such as waveform display, Waveform storage, parameter measurement, spectrum analysis, superpotential generation moment record to the superpotential data gathered, when monitoring surge arrester failure, can give the alarm, to make maintenance personal overhaul etc. corresponding lightning arrester as early as possible, ensure the safe operation of transformer station secondary system.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (9)
1. a transformer station secondary system Lightning Over-voltage monitoring system, is characterized in that, comprises low resistance capacitance-resistance series voltage divider, capacitance-resistance parallel voltage divider, trigger circuit, signal processing circuit, data collecting card, background computer; Capacitance-resistance parallel voltage divider input end is connected with low resistance capacitance-resistance series voltage divider output terminal, and output terminal is connected with trigger circuit input end, signal processing circuit input end respectively; Data collecting card one end is connected with trigger circuit output terminal, signal processing circuit output terminal respectively, and the other end is connected with background computer;
Low resistance capacitance-resistance series voltage divider obtains the overvoltage surge signal of transformer station secondary system, and is transferred to capacitance-resistance parallel voltage divider; Capacitance-resistance parallel voltage divider carries out dividing potential drop to overvoltage surge signal, obtains superpotential voltage division signal, and superpotential voltage division signal is transferred to trigger circuit and signal processing circuit respectively; Signal processing circuit carries out impedance isolation and low-pass filtering to superpotential voltage division signal, and by the overvoltage signal input data collecting card after low-pass filtering; Superpotential voltage division signal and default threshold voltage compare by trigger circuit, and when superpotential voltage division signal exceedes threshold voltage, trigger data acquisition card gathers the overvoltage signal that signal processing circuit exports; The overvoltage signal of collection is sent to background computer by data collecting card; Background computer is analyzed the overvoltage signal gathered, and judges the Reliability of Microprocessor of lightning arrester according to the result analyzed.
2. transformer station secondary system Lightning Over-voltage monitoring system according to claim 1, is characterized in that, described trigger circuit comprise the first voltage comparator, the second voltage comparator, phase inverter, photoelectrical coupler and logical and not gate;
First voltage comparator one input end is connected with capacitance-resistance parallel voltage divider output terminal, and another input end is connected with providing the reference voltage source of threshold voltage, and output terminal is connected with photoelectrical coupler input end; Second voltage comparator one input end is connected with capacitance-resistance parallel voltage divider output terminal, and another input end is connected with reference voltage source by phase inverter, and output terminal is connected with photoelectrical coupler input end; Photoelectric coupler output end is connected with data collecting card by logical and not gate.
3. transformer station secondary system Lightning Over-voltage monitoring system according to claim 1, is characterized in that, described signal processing circuit comprises and is connected to voltage follower between capacitance-resistance parallel voltage divider and data collecting card and active low-pass filter circuit.
4. transformer station secondary system Lightning Over-voltage monitoring system according to claim 3, is characterized in that, described active low-pass filter circuit adopts Sallen-Key circuit.
5. transformer station secondary system Lightning Over-voltage monitoring system according to claim 1, it is characterized in that, also comprise the communicator be connected between data collecting card, background computer, the overvoltage signal of data collecting card collection is transferred to background computer by described communicator.
6. transformer station secondary system Lightning Over-voltage monitoring system according to claim 5, is characterized in that, described communicator adopts ZigBee technology to carry out data transmission.
7. transformer station secondary system Lightning Over-voltage monitoring system according to claim 1, it is characterized in that, background computer comprises the content that the overvoltage signal gathered is analyzed: moment record occurs for waveform display, parameter measurement, spectrum analysis, Waveform storage, time measurement, superpotential.
8. the transformer station secondary system Lightning Over-voltage monitoring system according to claim 1 to 7 any one, is characterized in that, also comprise power supply.
9. transformer station secondary system Lightning Over-voltage monitoring system according to claim 8, is characterized in that, described power supply comprises lithium battery and DC/DC converter.
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| CN106597147A (en) * | 2016-11-24 | 2017-04-26 | 云南电网有限责任公司电力科学研究院 | State monitoring system and method of lightning arrester with series gap based on residual voltage monitoring |
| CN108414845A (en) * | 2018-03-08 | 2018-08-17 | 南方电网科学研究院有限责任公司 | Lightning energy frequency domain distribution statistical method based on optical integrated electric field sensor |
| CN110514913A (en) * | 2018-05-21 | 2019-11-29 | 南京南瑞继保电气有限公司 | A kind of substation's lightning stroke on-line monitoring method |
| CN110988444A (en) * | 2019-11-21 | 2020-04-10 | 深圳供电局有限公司 | Zinc oxide lightning arrester voltage divider, overvoltage detection lightning arrester and detection method |
| CN111722061A (en) * | 2020-07-01 | 2020-09-29 | 上海恒敬电力科技有限公司 | But early warning device of remote monitoring power distribution station overvoltage operation |
| CN111812391A (en) * | 2020-06-05 | 2020-10-23 | 深圳供电局有限公司 | Overvoltage monitoring device and method for power transmission line |
| CN112362956A (en) * | 2020-11-23 | 2021-02-12 | 云南电网有限责任公司临沧供电局 | Overvoltage detection method and system for metal oxide arrester based on three-level voltage division |
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| CN108414845A (en) * | 2018-03-08 | 2018-08-17 | 南方电网科学研究院有限责任公司 | Lightning energy frequency domain distribution statistical method based on optical integrated electric field sensor |
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| CN110988444A (en) * | 2019-11-21 | 2020-04-10 | 深圳供电局有限公司 | Zinc oxide lightning arrester voltage divider, overvoltage detection lightning arrester and detection method |
| CN111812391A (en) * | 2020-06-05 | 2020-10-23 | 深圳供电局有限公司 | Overvoltage monitoring device and method for power transmission line |
| CN111722061A (en) * | 2020-07-01 | 2020-09-29 | 上海恒敬电力科技有限公司 | But early warning device of remote monitoring power distribution station overvoltage operation |
| CN112362956A (en) * | 2020-11-23 | 2021-02-12 | 云南电网有限责任公司临沧供电局 | Overvoltage detection method and system for metal oxide arrester based on three-level voltage division |
| CN112362956B (en) * | 2020-11-23 | 2024-07-16 | 云南电网有限责任公司临沧供电局 | Overvoltage detection method and system for metal oxide arrester based on three-level partial pressure |
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Application publication date: 20150930 |