CN104777388A - Method for recognizing power supply branch circuit users through zero sequence current sampling method - Google Patents
Method for recognizing power supply branch circuit users through zero sequence current sampling method Download PDFInfo
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- CN104777388A CN104777388A CN201510200895.8A CN201510200895A CN104777388A CN 104777388 A CN104777388 A CN 104777388A CN 201510200895 A CN201510200895 A CN 201510200895A CN 104777388 A CN104777388 A CN 104777388A
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Abstract
The invention belongs to the technical field of electric power zone testing and particularly relates to a method for recognizing power supply branch circuit users through a zero sequence current sampling method. According to the method for recognizing the power supply branch circuit users through the zero sequence current sampling method, on the basis of the principle that a pulse current method, power line carrier communication and harmonic analysis are combined, pulse current is sent to an extension set supply circuit, a measurement host enables an A phase, a B phase and a C phase on a switch to be wound together through a flexible current inductor, pulse current signals are measured, the result is sent to an extension set to be displayed in time through power line carrier communication by means of voltage phase detection and signal harmonica analysis processing, and the measured power supply branch circuit users are distinguished and recognized. The method has the advantage that which power supply branch circuits in zones supply power to the users can be conveniently, fast and accurately detected.
Description
Technical field
The invention belongs to power station area technical field of measurement and test, be specifically related to the method for a kind of zero-sequence current sampling method in power supply branched line user identifies.
Background technology
According to the unified plan of CHINA SOUTHERN POWER company, carry forward vigorously the line loss management in four divisions in electrical network dividing potential drop, subregion, separated time He Fentai district, reduce line loss.Platform district customer power supply data is put in its most basic work of the management become more meticulous exactly in order, and unusual fluctuation normalization.Platform district customer power supply data mainly comprises supply transformer, power supply branch line, phase sequence and user.
Because municipal administration transformation is for many years frequent, change and increased many intelligent transformation station, box-type substation newly, overhead transmission line changes low-voltage cable and also increases thereupon, design intelligence, compact conformation, especially at the power supply branched line putting platform district customer power supply data in order, account for groundwork amount, an instrument installed by each switch, carries out the power supply branched line of platform district customer power supply data, and work on the spot is heavy, wiring is many, inefficiency.
Summary of the invention
The present invention, in order to make up the defect of prior art, provides a kind of method of zero-sequence current sampling method in power supply branched line user identifies that customer power supply branched line is powered that can detect easily and fast, accurately.
The present invention is achieved through the following technical solutions:
The method of zero-sequence current sampling method in power supply branched line user identifies, comprise and measure main frame and measure extension set, adopt pulse current method, the principle that power line carrier communication and frequency analysis combine, pulse current is sent in extension set supply line, measuring main frame uses flexible current mutual inductor the A at switch, B, C three-phase is intertwined, pulsed current measurement signal, detected by voltage-phase and signal harmonic analyzing and processing, extension set is sent to show result by power line carrier communication in time, carry out distinguishing surveyed power supply branched line user to identify.
Further, during described power supply branched line user identifies, comprise measurement main frame, measure extension set and embedded microprocessor, measuring main frame is arranged on substation transformer low-pressure side bus, flexible current mutual inductor is for gathering current impulse sampling, wherein: A phase current mutual inductor is powered substation transformer low-pressure side branched line 1 switch a, b, c phase bus sheath together, output terminal is connected with measurement main frame a phase current end, B phase current mutual inductor is powered substation transformer low-pressure side branched line 2 switch a, b, c phase bus sheath together, output terminal is connected with measurement host B phase current end, C phase current mutual inductor is powered substation transformer low-pressure side branched line 3 switch a, b, c phase bus sheath together, output terminal is connected with measurement host C phase current end, voltage tester line judges and the transmission of carrier communication signal for measuring host supplying power and phase analysis, wherein: A phase voltage p-wire one end is with substation transformer low-pressure side A phase bus and connect, B phase voltage p-wire is with substation transformer low-pressure side B phase bus and connect, C phase voltage p-wire is with substation transformer low-pressure side C phase bus and connect, N phase voltage p-wire is with substation transformer low-pressure side N phase zero line and connect, the voltage tester line other end is connected with Test Host voltage receptacle.
Further, described measurement main frame comprises and the voltage tester line connect is connected with phase measuring circuit, carrier communication circuit, carry out voltage signal sampling, phase identification and carrier signal transmission, current transformer output terminal is connected with pulse current transmission circuit, by after the current pulse signal line attachment plate of acceptance by amplifying circuit carry out signal amplify and integrating circuit carry out inverse operation.
Further, described measurement extension set comprises and the voltage tester line connect is connected with carrier communication circuit and pulse current generating circuit, carries out carrier signal and transmits and pulse current transmission.
Further, single-chip microcomputer STC12C5A32S2 and embedded microprocessor AT91SAM7X256 is provided with in described measurement extension set, the phase detecting circuit of single-chip microcomputer STC12C5A32S2 by being made up of accurate amplifier TL084, embedded microprocessor AT91SAM7X256 samples bus current signal by AD converter, and from the voltage phase signal that bus detects, frequency analysis and calculating is carried out by internal digital signal handling procedure, therefrom extract the current impulse coded signal that extension set sends, and show on the liquid crystal display measuring extension set.
Further, described measurement main frame passes through the current waveform situation on the signal deteching circuit real-time analysis circuit of current transformer and inside, detection power bus-bar is measured the current impulse information that extension set sends, current transformer detects signal, enters the signal amplification circuit that instrument internal is made up of high-accuracy amplifier 1NA128U and carries out signal amplification.
The invention has the beneficial effects as follows: the method for a kind of zero-sequence current sampling method of the present invention in power supply branched line user identifies be not when having a power failure, be applied to power distribution station power branched line user identify, three distribution transformings can be detected easily and fast simultaneously, accurately to power branched line, once can only test a distribution transforming than original test to power branched line, efficiency improves three times, and therefore this system has promotional value and application prospect widely.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is the present invention's systematic schematic diagram in the specific implementation;
Fig. 2 is the circuit diagram of the present invention's power line phase metering circuit in the specific implementation;
Fig. 3 is the circuit diagram of the present invention's carrier transmitting-receiving circuit in the specific implementation;
Fig. 4 is the circuit diagram of the present invention's pulse current transmission circuit in the specific implementation;
Fig. 5 is the circuit diagram of the present invention's control module in the specific implementation;
Fig. 6 is the present invention's display screen circuit diagram in the specific implementation;
Fig. 7 is the present invention keyboard circuit figure in the specific implementation.
Embodiment
Accompanying drawing 1-7 is a kind of specific embodiment of the present invention.The method of this invention zero-sequence current sampling method in power supply branched line user identifies, comprise and measure main frame and measure extension set, adopt pulse current method, the principle that power line carrier communication and frequency analysis combine, pulse current is sent in extension set supply line, measuring main frame uses flexible current mutual inductor the A at switch, B, C three-phase is intertwined, pulsed current measurement signal, detected by voltage-phase and signal harmonic analyzing and processing, extension set is sent to show result by power line carrier communication in time, carry out distinguishing surveyed power supply branched line user to identify.
Further, during described power supply branched line user identifies, comprise measurement main frame, measure extension set and embedded microprocessor, measuring main frame is arranged on substation transformer low-pressure side bus, flexible current mutual inductor is for gathering current impulse sampling, wherein: A phase current mutual inductor is powered substation transformer low-pressure side branched line 1 switch a, b, c phase bus sheath together, output terminal is connected with measurement main frame a phase current end, B phase current mutual inductor is powered substation transformer low-pressure side branched line 2 switch a, b, c phase bus sheath together, output terminal is connected with measurement host B phase current end, C phase current mutual inductor is powered substation transformer low-pressure side branched line 3 switch a, b, c phase bus sheath together, output terminal is connected with measurement host C phase current end, voltage tester line judges and the transmission of carrier communication signal for measuring host supplying power and phase analysis, wherein: A phase voltage p-wire one end is with substation transformer low-pressure side A phase bus and connect, B phase voltage p-wire is with substation transformer low-pressure side B phase bus and connect, C phase voltage p-wire is with substation transformer low-pressure side C phase bus and connect, N phase voltage p-wire is with substation transformer low-pressure side N phase zero line and connect, the voltage tester line other end is connected with Test Host voltage receptacle.
Further, described measurement main frame comprises and the voltage tester line connect is connected with phase measuring circuit, carrier communication circuit, carry out voltage signal sampling, phase identification and carrier signal transmission, current transformer output terminal is connected with pulse current transmission circuit, by after the current pulse signal line attachment plate of acceptance by amplifying circuit carry out signal amplify and integrating circuit carry out inverse operation.
Further, described measurement extension set comprises and the voltage tester line connect is connected with carrier communication circuit and pulse current generating circuit, carries out carrier signal and transmits and pulse current transmission.
Further, single-chip microcomputer STC12C5A32S2 and embedded microprocessor AT91SAM7X256 is provided with in described measurement extension set, the phase detecting circuit of single-chip microcomputer STC12C5A32S2 by being made up of accurate amplifier TL084, detect the real-time phase of power-frequency voltage and the equivalent internal resistance of computational scheme, single-chip microcomputer is according to voltage-phase and circuit internal resistance, calculate and can send current impulse at which phase angle of power-frequency voltage, when arriving this phase angle, single-chip microcomputer internally controllable silicon S6070W exports a triggering and conducting signal, controllable silicon is transient switching immediately, the current impulse of a fixed amplitude and width is sent to power circuit, and form a series of current impulse including coded message by several this current impulse, finally be sent on power circuit, embedded microprocessor AT91SAM7X256 samples bus current signal by AD converter, and from the voltage phase signal that bus detects, frequency analysis and calculating is carried out by internal digital signal handling procedure, therefrom extract the current impulse coded signal that extension set sends, if these current pulse signals detected in certain phase, then can judge that customer power supply circuit is just connected in this phase, after measuring main frame identification success, Identification display result on liquid crystal display, then carrier signal is sent by the power carrier communication module included to this phase circuit, recognition result is sent to measurement extension set, after measurement extension set receives the communication of measuring main frame, above-mentioned recognition result is shown on the liquid crystal display measuring extension set, check for line inspection person.
Further, described measurement main frame passes through the current waveform situation on the signal deteching circuit real-time analysis circuit of current transformer and inside, detection power bus-bar is measured the current impulse information that extension set sends, current transformer detects signal, enter the signal amplification circuit that instrument internal is made up of high-accuracy amplifier 1NA128U and carry out signal amplification, because the size of current on bus is not fixed, signal amplification circuit can regulate self signal amplification factor automatically according to bus current amplitude, be convenient to synchronized sampling A/D convertor circuit AD7606 and carry out AD conversion.
The present invention is not limited to above-mentioned embodiment, anyone should learn make under enlightenment of the present invention with the present invention, there is identical or close technical scheme, all fall within protection scope of the present invention.
The technology that the present invention does not describe in detail, shape, structure part are known technology.
Claims (6)
1. the method for zero-sequence current sampling method in power supply branched line user identifies, it is characterized in that, comprise and measure main frame and measure extension set, adopt pulse current method, the principle that power line carrier communication and frequency analysis combine, pulse current is sent in extension set supply line, measuring main frame uses flexible current mutual inductor the A at switch, B, C three-phase is intertwined, pulsed current measurement signal, detected by voltage-phase and signal harmonic analyzing and processing, by power line carrier communication, result is sent to the display of measurement extension set in time, carry out distinguishing surveyed power supply branched line user to identify.
2. the method for zero-sequence current sampling method according to claim 1 in power supply branched line user identifies, it is characterized in that: during described power supply branched line user identifies, measuring main frame is arranged on substation transformer low-pressure side bus, flexible current mutual inductor is for gathering current impulse sampling, wherein: A phase current mutual inductor is powered substation transformer low-pressure side branched line 1 switch a, b, c phase bus sheath together, output terminal is connected with measurement main frame a phase current end, B phase current mutual inductor is powered substation transformer low-pressure side branched line 2 switch a, b, c phase bus sheath together, output terminal is connected with measurement host B phase current end, C phase current mutual inductor is powered substation transformer low-pressure side branched line 3 switch a, b, c phase bus sheath together, output terminal is connected with measurement host C phase current end, voltage tester line judges and the transmission of carrier communication signal for measuring host supplying power and phase analysis, wherein: A phase voltage p-wire one end is with substation transformer low-pressure side A phase bus and connect, B phase voltage p-wire is with substation transformer low-pressure side B phase bus and connect, C phase voltage p-wire is with substation transformer low-pressure side C phase bus and connect, N phase voltage p-wire is with substation transformer low-pressure side N phase zero line and connect, the voltage tester line other end is connected with Test Host voltage receptacle.
3. the method for zero-sequence current sampling method according to claim 1 in power supply branched line user identifies, it is characterized in that: described measurement main frame comprises and the voltage tester line connect is connected with phase measuring circuit, carrier communication circuit, carry out voltage signal sampling, phase identification and carrier signal transmission, current transformer output terminal is connected with pulse current transmission circuit, by after the current pulse signal line attachment plate of acceptance by amplifying circuit carry out signal amplify and integrating circuit carry out inverse operation.
4. the method for zero-sequence current sampling method according to claim 1 in power supply branched line user identifies, it is characterized in that: described measurement extension set comprises and the voltage tester line connect is connected with carrier communication circuit and pulse current generating circuit, carry out carrier signal and transmit and pulse current transmission.
5. the method for the zero-sequence current sampling method according to claim 1 or 4 in power supply branched line user identifies, it is characterized in that: in described measurement extension set, be provided with single-chip microcomputer STC12C5A32S2 and embedded microprocessor AT91SAM7X256, the phase detecting circuit of single-chip microcomputer STC12C5A32S2 by being made up of accurate amplifier TL084, embedded microprocessor AT91SAM7X256 samples bus current signal by AD converter, and from the voltage phase signal that bus detects, frequency analysis and calculating is carried out by internal digital signal handling procedure, therefrom extract the current impulse coded signal that extension set sends, and show on the liquid crystal display measuring extension set.
6. the method for zero-sequence current sampling method according to claim 1 and 2 in power supply branched line user identifies, it is characterized in that: described measurement main frame passes through the current waveform situation on the signal deteching circuit real-time analysis circuit of current transformer and inside, detection power bus-bar is measured the current impulse information that extension set sends, current transformer detects signal, enters the signal amplification circuit that instrument internal is made up of high-accuracy amplifier 1NA128U and carries out signal amplification.
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| CN106370914A (en) * | 2016-09-26 | 2017-02-01 | 武汉科技大学 | Zero sequence current carrier signal generating device and signal transmission method |
| CN106781414A (en) * | 2017-01-04 | 2017-05-31 | 深圳市中创电测技术有限公司 | A kind of platform area network topology dynamic self-adapting method based on bandwidth carrier |
| CN107782949A (en) * | 2016-08-25 | 2018-03-09 | 浙江万胜智能科技股份有限公司 | A kind of zero sequence current measurement device of distribution line |
| CN109038669A (en) * | 2018-08-23 | 2018-12-18 | 嘉兴爱索乐信息技术有限公司 | Realize the photovoltaic system that component level is automatically shut down |
| CN110082587A (en) * | 2019-04-23 | 2019-08-02 | 深圳供电局有限公司 | Detection circuit and multi-branch identification device |
| CN110187232A (en) * | 2019-05-08 | 2019-08-30 | 国网江苏省电力有限公司泰州供电分公司 | A kind of intelligent monitoring device for matching electricity consumption synchronous data sampling suitable for low-voltage platform area |
| CN111007315A (en) * | 2019-11-26 | 2020-04-14 | 武汉大学 | Circuit branch identification method based on current harmonic spectrum |
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| CN110082587A (en) * | 2019-04-23 | 2019-08-02 | 深圳供电局有限公司 | Detection circuit and multi-branch identification device |
| CN110187232A (en) * | 2019-05-08 | 2019-08-30 | 国网江苏省电力有限公司泰州供电分公司 | A kind of intelligent monitoring device for matching electricity consumption synchronous data sampling suitable for low-voltage platform area |
| CN110187232B (en) * | 2019-05-08 | 2021-09-03 | 国网江苏省电力有限公司泰州供电分公司 | Intelligent monitoring device suitable for synchronous acquisition of power distribution and utilization data of low-voltage transformer area |
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Address after: 530000 Nanning, Jiangnan District, the Guangxi Zhuang Autonomous Region Avenue, No. 43 Applicant after: NANNING POWER SUPPLYING BUREAU OF GUANGXI POWER GRID CORPORTAION Applicant after: Shandong reaches along Electronic Science and Technology Co., Ltd. Address before: 250000, room 1, building 2218, Baihua Road, 1-2401 Hualong Road, Ji'nan hi tech Zone, Shandong Applicant before: Shandong reaches along Electronic Science and Technology Co., Ltd. Applicant before: NANNING POWER SUPPLYING BUREAU OF GUANGXI POWER GRID CORPORTAION |
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Inventor after: Lan Guoliang Inventor after: Wang Deao Inventor after: Wu Binji Inventor after: Wang Peng Inventor after: Lin Quan Inventor before: Lan Guoliang Inventor before: Wang Deao Inventor before: Wu Binji Inventor before: Wang Peng Inventor before: Lin Quan Inventor before: Luo Jun Inventor before: Xu Xuegang Inventor before: Yang Mei |
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