CN104377676A - PT intelligent resonance elimination device for power distribution network - Google Patents
PT intelligent resonance elimination device for power distribution network Download PDFInfo
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- CN104377676A CN104377676A CN201410601689.3A CN201410601689A CN104377676A CN 104377676 A CN104377676 A CN 104377676A CN 201410601689 A CN201410601689 A CN 201410601689A CN 104377676 A CN104377676 A CN 104377676A
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Abstract
The invention discloses a PT intelligent resonance elimination device for a power distribution network. The PT intelligent resonance elimination device comprises a signal conditioning module, a data collecting module, a central processing unit, a sound-light alarming module, a resonance elimination device triggering module and a resonance elimination device body. The signal conditioning module collects a voltage signal and carries out lowpass filtering on the signal to eliminate the frequency aliasing phenomenon possibly caused by a signal with over-high frequency during spectral analysis; the data collecting module carries out A/D conversion on the voltage signal processed by the signal conditioning module; the central processing unit carries out data analysis on the voltage signal and sends the signal to the sound-light alarming module and the resonance elimination device triggering module; the sound-light alarming module can give out a sound-light alarm when a system has faults; the resonance elimination device triggering module sends out a trigger signal to control switching on and off of a thyristor of the resonance elimination device body; the resonance elimination device body comprises a damper electric reactor and an antiparallel silicon-controlled thyristor. By means of the PT intelligent resonance elimination device for the power distribution network, the ferromagnetic resonance fault can be effectively eliminated, a single-phase grounding fault and the ferromagnetic resonance fault can be effectively distinguished, and the sound-light alarm is given out.
Description
Technical field
The invention belongs to power system security analysis field, relate to a kind of power distribution network PT Intelligent resonance suppression device.
Background technology
In the power distribution network of 6 ~ 35KV, system neutral generally adopts earth-free mode.System busbar is connected to the electromagnetic potential transformer (PT) measured and monitor insulation against ground, when there is bus-tie circuit breaker closing operation, the single-phase arc grounding of circuit automatically disappear or the situation such as system loading acute variation time, the transient state impact process produced may excite ferro resonance phenomenon between PT and three-phase conducting wire direct-to-ground capacitance, cause the overcurrent in system overvoltage and PT, make weak insulator arrangement in system that the high-voltage wire iron-melting fusing of flashover, PT over the ground occur, even burn PT.The ferro resonance of PT be occur in power distribution network the most frequent, cause the accident maximum a kind of Past Voltage within Power System.
At present, limit PT ferro resonance and mainly adopt following methods:
1.PT open delta connects damping resistance, and weak point is when selecting resistance, as resistance is too large, does not have harmonic elimination effect, as resistance is too little, then requires that PT has the capacity of enough large heat;
2. PT primary side neutral point be connected in series nonlinear resistance resonance eliminator between ground, its limitation is only effective to this PT, invalid to other PT, therefore all nonlinear resistance resonance eliminator to be installed to each PT, and the voltage-current characteristic of PT itself is inconsistent, the signalizing activity of influential system insulation monitoring and warning device;
3. adopt the mode of connection of 4PT, shortcoming is likely occur very large circulation at open delta and cause a winding overheated with residue winding.
Summary of the invention
In order to solve problems of the prior art, the invention provides one and can effectively eliminate ferro resonance fault, simultaneously effective differentiation single-phase earthing and ferro resonance fault, and send the power distribution network PT Intelligent resonance suppression device of sound and light alarm.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of power distribution network PT Intelligent resonance suppression device, comprises with lower part:
Signal-regulated kinase, is converted to the voltage signal of-5V ~+5V of applicable capture card sampling, and carries out low-pass filtering to signal by the voltage signal sent from PT open-triangular winding;
Data acquisition module, gather the voltage signal through Signal-regulated kinase process, sample frequency is set to 1KHz, and carries out A/D conversion;
CPU, carrying out data analysis to gathering the voltage signal of coming, preserving analysis result and transmitting a signal to sound and light alarm module and harmonic elimination apparatus trigger module;
Sound and light alarm module, comprises buzzer, can send sound and light alarm during the system failure;
Harmonic elimination apparatus trigger module, sends the turn-on and turn-off that triggering signal controls harmonic elimination apparatus thyristor;
Harmonic elimination apparatus, comprises damping reactor and inverse parallel silicon controlled crystal brake pipe.
As preferred embodiment of the present invention, Signal-regulated kinase also comprises second order active low pass filter, and arranging cut-off frequency is 500Hz, crosses the frequency alias phenomenon that high-frequency signal may cause when eliminating spectrum analysis.
As preferred embodiment of the present invention, adopting the pattern of real-time continuous sampling when data acquisition module carries out data sampling, when reading sampled data, then adopting the mode according to needing selectivity to read.
As preferred embodiment of the present invention, CPU adopts the voltage sampling signal reading two cycles continuously to judge that whether voltage is out-of-limit, if what voltage effective value that namely continuous two ondometes calculate all had exceeded setting closes value, just regard as system jam, next step fault handling operation will be performed, otherwise will be judged to be that system mode is normal, the sampled data continuing to read ensuing two continuous cycles will be judged.
As preferred embodiment of the present invention, after CPU judges system jam, will send harmonic elimination pulse signal immediately, harmonic elimination apparatus trigger module receives signal enabling harmonic elimination apparatus, using 20ms as the time interval, control inverse parallel silicon controlled crystal brake pipe break-make three times repeatedly.
As preferred embodiment of the present invention, after CPU judges system jam, also send failure alarm signal simultaneously, send sound and light alarm by sound and light alarm module.
As preferred embodiment of the present invention, thyristor is repeatedly after break-make 3 times, if detect that below the threshold value that residual voltage threshold value drops to setting even disappears, then judges that system there occurs ferro resonance fault, otherwise is judged as earth fault.
In sum, power distribution network PT Intelligent resonance suppression device provided by the present invention, is had after CPU judges system jam, also sends failure alarm signal simultaneously, sent the function of sound and light alarm by sound and light alarm module; And relative to prior art, have the following advantages:
1. after collecting the voltage signal exceeding setting threshold, first carry out harmonic elimination process, thyristor break-make three times repeatedly, gather the voltage signal of continuous two cycles again, if still exceed the threshold value of setting, then judge that system there occurs earth fault, otherwise be judged as ferro resonance fault, therefore effectively can distinguish single-phase earthing and ferro resonance fault.
2., after CPU judges system jam, also send failure alarm signal simultaneously, send sound and light alarm by sound and light alarm module, the very first time allows staff understand system running state.
Accompanying drawing explanation
Fig. 1 is power distribution network PT Intelligent resonance suppression apparatus structure schematic diagram of the present invention;
Fig. 2 is power distribution network PT Intelligent resonance suppression device workflow diagram of the present invention.
Embodiment
In order to more specifically describe the present invention, below in conjunction with the drawings and the specific embodiments, power distribution network PT Intelligent resonance suppression device of the present invention is described in detail.
With reference to shown in Fig. 1, this power distribution network PT Intelligent resonance suppression device, comprises with lower part:
Signal-regulated kinase, is converted to the voltage signal of-5V ~+5V of applicable capture card sampling, and carries out low-pass filtering to signal by the voltage signal sent from PT open-triangular winding;
Data acquisition module, gather the voltage signal through Signal-regulated kinase process, sample frequency is set to 1KHz, and carries out A/D conversion;
CPU, carrying out data analysis to gathering the voltage signal of coming, preserving analysis result and transmitting a signal to sound and light alarm module and harmonic elimination apparatus trigger module;
Sound and light alarm module, comprises buzzer, can send sound and light alarm during the system failure;
Harmonic elimination apparatus trigger module, sends the turn-on and turn-off that triggering signal controls harmonic elimination apparatus thyristor;
Harmonic elimination apparatus, comprises damping reactor and inverse parallel silicon controlled crystal brake pipe.
Signal-regulated kinase also comprises second order active low pass filter, and arranging cut-off frequency is 500Hz, crosses the frequency alias phenomenon that high-frequency signal may cause when eliminating spectrum analysis.
Data acquisition module adopts the pattern of real-time continuous sampling when carrying out data sampling, then adopt the mode according to needing selectivity to read when reading sampled data.
With reference to shown in Fig. 2, this CPU reads the voltage sampling signal of two cycles continuously, when system generation single-phase earthing or ferro-resonance over-voltage, PT open-triangular winding two ends will induce the residual voltage of about 100V, therefore, the running status of system is judged by the mode setting a residual voltage threshold value (this device is set to 60V, can revise at any time according to real system operating experience).When the voltage effective value that continuous two ondometes calculate all has exceeded the threshold value of setting, just regard as system jam, to next step fault handling operation be performed, otherwise be then judged to be that system mode is normal, the sampled data continuing to read ensuing two continuous cycles is judged.
After CPU judges system jam, harmonic elimination pulse signal will be sent immediately, harmonic elimination apparatus trigger module receives signal enabling harmonic elimination apparatus, using 20ms as the time interval, control inverse parallel silicon controlled crystal brake pipe break-make three times repeatedly, namely trigger impulse makes turn on thyristors, cutoff thyristor again after 20ms, turn off after 20ms, again allow turn on thyristors 20ms, 3 times so repeatedly; If the residual voltage of short circuit PT open-triangular winding 3 after-opening triangles still exceedes the threshold value of setting so repeatedly, then be judged as earth fault, and send grounding alarm signal, if even disappeared below the threshold value that the residual voltage of open delta drops to setting, then be judged as ferro resonance fault, and send resonance alarm signal.
Claims (7)
1. a power distribution network PT Intelligent resonance suppression device, is characterized in that, comprises with lower part:
Signal-regulated kinase, is converted to the voltage signal of-5V ~+5V of applicable capture card sampling, and carries out low-pass filtering to signal by the voltage signal sent from PT open-triangular winding;
Data acquisition module, gather the voltage signal through Signal-regulated kinase process, sample frequency is set to 1KHz, and carries out A/D conversion;
CPU, carrying out data analysis to gathering the voltage signal of coming, preserving analysis result and transmitting a signal to sound and light alarm module and harmonic elimination apparatus trigger module;
Sound and light alarm module, comprises buzzer, can send sound and light alarm during the system failure;
Harmonic elimination apparatus trigger module, sends the turn-on and turn-off that triggering signal controls harmonic elimination apparatus thyristor;
Harmonic elimination apparatus, comprises damping reactor and inverse parallel silicon controlled crystal brake pipe.
2. power distribution network PT Intelligent resonance suppression device according to claim 1, it is characterized in that, Signal-regulated kinase also comprises second order active low pass filter, and arranging cut-off frequency is 500Hz, crosses the frequency alias phenomenon that high-frequency signal may cause when eliminating spectrum analysis.
3. power distribution network PT Intelligent resonance suppression device according to claim 1, is characterized in that, adopting the pattern of real-time continuous sampling, then adopting the mode according to needing selectivity to read when reading sampled data when data acquisition module carrying out data sampling.
4. power distribution network PT Intelligent resonance suppression device according to claim 1, it is characterized in that, CPU adopts the voltage sampling signal reading two cycles continuously to judge that whether voltage is out-of-limit, if what voltage effective value that namely continuous two ondometes calculate all had exceeded setting closes value, just regard as system jam, to next step fault handling operation be performed, otherwise will be judged to be that system mode is normal, the sampled data continuing to read ensuing two continuous cycles is judged.
5. power distribution network PT Intelligent resonance suppression device according to claim 1, it is characterized in that, after CPU judges system jam, harmonic elimination pulse signal will be sent immediately, harmonic elimination apparatus trigger module receives signal enabling harmonic elimination apparatus, using 20ms as the time interval, control inverse parallel silicon controlled crystal brake pipe break-make three times repeatedly.
6. power distribution network PT Intelligent resonance suppression device according to claim 5, is characterized in that, after CPU judges system jam, also send failure alarm signal simultaneously, send sound and light alarm by sound and light alarm module.
7. power distribution network PT Intelligent resonance suppression device according to claim 5, it is characterized in that, thyristor is repeatedly after break-make 3 times, if detect that below the threshold value that residual voltage threshold value drops to setting even disappears, then judge that system there occurs ferro resonance fault, otherwise be judged as earth fault.
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| CN201410601689.3A CN104377676A (en) | 2014-10-31 | 2014-10-31 | PT intelligent resonance elimination device for power distribution network |
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| CN105552867A (en) * | 2015-12-21 | 2016-05-04 | 中国西电电气股份有限公司 | Device and method for inhibiting ferromagnetic resonance in high-voltage grid GIS |
| CN105913190A (en) * | 2016-04-15 | 2016-08-31 | 国网江苏省电力公司盐城供电公司 | Calculation method for alarm accuracy of ferromagnetic resonance fault |
| CN106207970A (en) * | 2016-08-17 | 2016-12-07 | 云南电网有限责任公司电力科学研究院 | The ferromagnetic resonance harmonic elimination method of detection zero-sequence current pulse number |
| CN106328361A (en) * | 2016-08-30 | 2017-01-11 | 合肥智博电气有限公司 | Resonation elimination mechanism used in arc-resonation elimination device |
| CN107276029A (en) * | 2017-06-20 | 2017-10-20 | 安徽南瑞继远电网技术有限公司 | Anti- personal electrical shock circuit breaker control method and system based on Waveform Identification Technology |
| CN112564042A (en) * | 2020-11-17 | 2021-03-26 | 国网天津市电力公司 | Resonance elimination method for power grid |
| CN113097986A (en) * | 2021-03-31 | 2021-07-09 | 国网内蒙古东部电力有限公司电力科学研究院 | Protection method, device and system for primary harmonic elimination device of distribution network voltage transformer |
| CN116131214A (en) * | 2023-04-18 | 2023-05-16 | 山东计保电气有限公司 | Network management system of digital harmonic elimination device and use method thereof |
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| CN105913190A (en) * | 2016-04-15 | 2016-08-31 | 国网江苏省电力公司盐城供电公司 | Calculation method for alarm accuracy of ferromagnetic resonance fault |
| CN106207970A (en) * | 2016-08-17 | 2016-12-07 | 云南电网有限责任公司电力科学研究院 | The ferromagnetic resonance harmonic elimination method of detection zero-sequence current pulse number |
| CN106328361A (en) * | 2016-08-30 | 2017-01-11 | 合肥智博电气有限公司 | Resonation elimination mechanism used in arc-resonation elimination device |
| CN107276029A (en) * | 2017-06-20 | 2017-10-20 | 安徽南瑞继远电网技术有限公司 | Anti- personal electrical shock circuit breaker control method and system based on Waveform Identification Technology |
| CN107276029B (en) * | 2017-06-20 | 2019-04-16 | 安徽南瑞继远电网技术有限公司 | Anti- personal electrical shock circuit breaker control method and system based on Waveform Identification Technology |
| CN112564042A (en) * | 2020-11-17 | 2021-03-26 | 国网天津市电力公司 | Resonance elimination method for power grid |
| CN113097986A (en) * | 2021-03-31 | 2021-07-09 | 国网内蒙古东部电力有限公司电力科学研究院 | Protection method, device and system for primary harmonic elimination device of distribution network voltage transformer |
| CN113097986B (en) * | 2021-03-31 | 2022-10-18 | 国网内蒙古东部电力有限公司电力科学研究院 | Protection method, device and system for primary harmonic elimination device of distribution network voltage transformer |
| CN116131214A (en) * | 2023-04-18 | 2023-05-16 | 山东计保电气有限公司 | Network management system of digital harmonic elimination device and use method thereof |
| CN116131214B (en) * | 2023-04-18 | 2023-07-11 | 山东计保电气有限公司 | Network management system of digital harmonic elimination device and use method thereof |
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