CN101769958A - High-voltage capacitor bank branch current monitoring device - Google Patents
High-voltage capacitor bank branch current monitoring device Download PDFInfo
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Abstract
The invention discloses a high-voltage capacitor bank branch current monitoring device, comprising a self-excitation energy obtaining and power converting circuit, a current detection and acquisition circuit, a CPU data acquisition and controlling circuit and a wireless transceiving circuit, the self-excitation energy obtaining and power converting circuit obtains energy from the high-voltage line and converts and outputs direct voltage; and the current detection and acquisition circuit collects current instantaneous value, and outputs to the CPU data acquisition and controlling device, which is used for finishing branch unbalanced current AD alternating current sampling, current harmonic calculation and finishing bidirectional wireless digital transmission via the wireless transceiving circuit. The monitoring device solves the problem of monitoring protection of a capacitor bank under high potential, discloses the damage mechanism of the capacitor bank by taking the branch unbalanced current and harmonic distribution in the fault process of the capacitor bank as the analysis basis, thus reducing fault rate of the capacitor bank and having significant meanings in improving power grid safe operation level and economic efficiency.
Description
Technical field
The present invention relates to the current monitoring technical field, relate in particular to the wireless monitoring device of high-voltage capacitor bank branch current under a kind of high pressure floating potential that is applied in the electric system.
Background technology
Along with China's electrical network is transferred electricity from the west to the east, north and south supplies mutually and on national network implementation, power grid construction is constantly strengthened.For improving stabilization of power grids level, increase the ability to transmit electricity of circuit, strengthen the grid short circuit levels of current, series compensation capacitance device and electrical network dynamic passive compensation technology and short trouble current limiting technique day by day are subjected to the attention of each side, and this class engineering project is being planned and built to some large regional grids all.
Wherein, the capacitor group is mended the primary equipment of device, dynamic reactive compensation device and series resonance-type Fault Current Limiting Device major function as undertaking string, and its performance quality has determined the operational reliability of device, is the critical component that needs most protection.
In the circuit that is equiped with string benefit device, dynamic reactive compensation device and series resonance-type Fault Current Limiting Device, when line failure or adjacent lines breaks down, electric current flows through the capacitor group, produces higher voltage at the capacitor two ends, causes the capacitor group to be damaged easily.In order to prevent under the fault current situation; the superpotential at capacitor group two ends causes the damage of capacitor; general over-voltage protection method is at present: the MOV (metal oxide pressure-limiting device in parallel at the capacitor two ends; for the english abbreviation of Metal Oxide Varistor, hereinafter to be referred as MOV) capacitor is protected.When condenser voltage reached the protection level, the rising of the voltage at MOV limiting capacitance device two ends can not be damaged by protective condenser.Can bear the overload of short time on the capacitor and be not damaged, yet, may cause the aging or insulation damages of capacitor along with the prolongation of overload time.
The capacitor group generally is made up of capacitor unit, and capacitor unit is formed by many capacitor series and parallels.The work of capacitor group should not be subjected to the influence of single capacitor fault, when cell capaciator group internal capacitor element punctures because of superpotential or during fuse failure, this capacitor element is promptly out of service, thereby makes the capacitor bank units equivalent capacitance reduce.This reducing will cause the electric current that flows through this unit to increase, and voltage raises, and non-fault capacitor element is caused adverse effect, even cause vicious cycle.In order to prevent that capacity cell from snowslide occurring and damaging, must the measure of corresponding online monitoring and protecting be set to capacitor group branch road out-of-balance current, avoid the generation of this type of phenomenon.
Yet because the capacitor group that string is mended in device, dynamic reactive compensation device and the series resonance-type Fault Current Limiting Device is in noble potential, it can problem be the insoluble technical barrier of prior art that the power supply of capacitor bank branch current monitoring device is got.In addition, the branch current monitoring device is in noble potential, electromagnetic environment of living in is abominable, the big electric current of transmission line of electricity, high voltage field intensity can cause bigger electromagnetic interference (EMI) to monitoring device, the Anti-interference Design problem of capacitor bank branch current monitoring device, and be in the communication problem of the monitoring device and the uphole equipment of noble potential, all be the insoluble technical matters of prior art.Therefore, there is not the monitoring device that is used for capacitor group branch road out-of-balance current is carried out the on-line monitoring protection in the prior art at present.
Summary of the invention
At the defective of prior art, the invention provides a kind of high-voltage capacitor bank branch current monitoring device, with solve the monitoring device power supply that exists in the prior art get can, anti-interference, and and problems such as uphole equipment communication.
For addressing the above problem, the invention provides following technical scheme:
A kind of high-voltage capacitor bank branch current monitoring device, described monitoring device comprise encouraging oneself gets energy and power-switching circuit, current detecting Acquisition Circuit, cpu data acquisition control circuit and wireless transceiver circuit.
Energy is got in described self-excitation and power-switching circuit is obtained power supply and changed output dc voltage supplying electric current detection Acquisition Circuit and cpu data acquisition control circuit from high-tension line; The current detecting Acquisition Circuit is used for gathering, handling the branch current instantaneous value, and export the cpu data acquisition control circuit to, described cpu data acquisition control circuit is used to finish branch road out-of-balance current AD (analog digital conversion, hereinafter to be referred as AD) AC sampling, current harmonics calculate, and finish the double-direction radio digital transmission through wireless transceiver circuit.
Energy is got in described self-excitation and power-switching circuit comprises that current transformer, due to voltage spikes absorb circuit, output voltage feedback and mu balanced circuit, power filter and anti-jamming circuit and power-switching circuit.
Described self-excitation is got and can be absorbed circuit and bidirectional triode thyristor by circuit mutual inductor output terminal shunt voltage spike, the electric energy that the circuit mutual inductor is obtained is input to power filter and anti-jamming circuit through bridge rectifier, its voltage is exported to output voltage feedback and mu balanced circuit, and through power-switching circuit output burning voltage.
Described output voltage negative feedback and mu balanced circuit comprise bidirectional triode thyristor and trigger circuit.
Described power filter and anti-jamming circuit output burning voltage are 10V, and power-switching circuit output burning voltage is 3.3V.
Described current detecting Acquisition Circuit comprises current transformer, measuring resistance, capacitance, low-pass filter and is used for diode, the stabilivolt of input protection.
Described cpu data acquisition control circuit is used to finish the AD interchange collection of electric current, and carries out effective value and calculate and the current harmonics analysis.
Described wireless transceiver circuit is the low-power consumption transceiving device, is used for the double-direction radio data transmission, and its transmitting-receiving frequency is 433MHz.
Adopt high-voltage capacitor bank branch current wireless monitoring device of the present invention well to solve the monitoring and protecting problem of capacitor group under the noble potential; with branch road out-of-balance current, Harmonic Distribution in the capacitor group failure process serves as to analyze foundation; disclose capacitor group damage mechanism; to reduce the failure rate of capacitor group, significant to improving electric power netting safe running level and economic benefit.Simultaneously, possess following beneficial effect:
1, energy and power source conversion are got in the self-excitation of noble potential line current, have improved the security and the reliability of device;
2, adopt the wireless short-distance digital transmission, solved the communication problem of noble potential;
3, the low-power consumption chip design is adopted in the device circuit design, and the line current self-excitation is got and can be satisfied power requirement by circuit;
4, adopt multinomial electromagnetism interference protection measure, satisfied the requirement of reliably working under big electric current, high voltage electromagnetic interference environment;
5, circuit is realized simply, cost is low, device is easy to choose.
Description of drawings
Fig. 1 is a high-voltage capacitor bank branch current monitoring device general structure synoptic diagram of the present invention;
Fig. 2 is a high-voltage capacitor bank branch current monitoring device workflow diagram of the present invention;
Fig. 3 gets the theory diagram of energy and power-switching circuit for the present invention's self-excitation;
Fig. 4 is the theory diagram of current detecting Acquisition Circuit of the present invention;
Fig. 5 is the theory diagram of cpu data acquisition control circuit of the present invention and wireless transceiver circuit.
Embodiment
The invention provides a kind of high-voltage capacitor bank branch current monitoring device.The specific embodiment of the present invention is as follows:
The capacitor group is mended the primary equipment of device, dynamic reactive compensation device and series resonance-type Fault Current Limiting Device major function as undertaking string, and its performance quality has determined the operational reliability of device, is the critical component that needs most protection.
The capacitor group generally is made up of capacitor unit, and capacitor unit is formed by many capacitor series and parallels.The work of capacitor group should not be subjected to the influence of single capacitor fault, when cell capaciator group internal capacitor element punctures because of superpotential or during fuse failure, this capacitor element is promptly out of service, thereby makes the capacitor bank units equivalent capacitance reduce.This reducing will cause the electric current that flows through this unit to increase, and voltage raises, and non-fault capacitor element is caused adverse effect, even cause vicious cycle.In order to prevent that capacity cell from snowslide occurring and damaging, the present invention is provided with the measure of corresponding online monitoring and protecting to capacitor group branch road out-of-balance current, avoids the generation of this type of phenomenon.
The out-of-balance current monitoring and protecting is under running status, connects the size of the electric current (out-of-balance current) of branch road by monitoring capacitor group brachium pontis mid point, judges and the ruuning situation of weighing cell capaciator group internal capacitor element.When the cell capaciator group was inner intact, when not considering capacitor element parameter difference, measuring system error, the theoretical value that its center connects the out-of-balance current on the branch road should be 0.When inside had capacitor element out of service, bridge arm balance was destroyed, and out-of-balance current occurs thereupon, and this out-of-balance current will be with the number of internal capacitor component wear, i.e. the increase of degree of unbalancedness and strengthening.Under the situation that the damage of individual capacitors unit or capacitor group occurs, capacitor group branch road out-of-balance current monitoring and protecting can guarantee to comprise capacitor primary equipment safety.
High-voltage capacitor bank branch current monitoring device of the present invention has solved the monitoring and protecting problem of capacitor group under the noble potential; with branch road out-of-balance current, Harmonic Distribution in the capacitor group failure process serves as to analyze foundation; disclose capacitor group damage mechanism, to reduce the failure rate of capacitor group.According to different requirements, Verification of Measuring Current Transformer (hereinafter to be referred as CT) primary side is measured can refine to each capacitor branch road, thereby by monitoring branch road out-of-balance current effective value being calculated and frequency analysis, can drawing specifically is which electric capacity of that branch road of capacitor group is damaged.
The invention will be further described below in conjunction with accompanying drawing and specific embodiment.
As shown in Figure 1, the present invention is for adopting the novel high-pressure capacitor bank branch current wireless monitoring device of self-excitation power supply, and it mainly comprises encouraging oneself gets energy and power-switching circuit, current detecting Acquisition Circuit, cpu data acquisition control circuit and wireless transceiver circuit.
The present invention need not to adopt the power supply mode of additional power source, but get energy and power-switching circuit by self-excitation, get energy CT (current transformer by line current, hereinafter to be referred as CT) directly obtain power supply from the high-tension line that is positioned at noble potential, pass through the power-switching circuit output dc voltage again, offer current detecting Acquisition Circuit and cpu data acquisition control circuit, realize the power supply of monitoring device.The current detecting Acquisition Circuit is measured CT by out-of-balance current and is detected the instantaneous value that capacitor group brachium pontis mid point connects branch current (out-of-balance current), exports the cpu data acquisition control circuit to after detection signal is handled.The cpu data acquisition control circuit is finished branch road out-of-balance current AD AC sampling, and current harmonics calculates, and finishes the double-direction radio digital transmission through wireless transceiver circuit.
As shown in Figure 2, the workflow of high-voltage capacitor bank branch current monitoring device of the present invention, concrete steps are as follows:
1, gets and to obtain energy from high-tension line by CT, through the power-switching circuit output dc voltage, for package unit provides direct supply;
2, capacitive branch current measurement CT detection branch out-of-balance current instantaneous value;
3, the current monitoring Acquisition Circuit transfers to cpu control circuit after acquired signal is handled;
4, cpu control circuit is finished electric current AD AC sampling;
5, cpu control circuit carries out current effective value, frequency analysis is calculated;
6, cpu control circuit by wireless transceiver circuit, is finished the double-direction radio digital transmission of signal with result of calculation.
Fig. 3 to Fig. 5 is the schematic diagram of each circuit ingredient of monitoring device of the present invention, elaborates the principle of work of each built-up circuit below in conjunction with accompanying drawing.
As shown in Figure 3, get in energy and the power-switching circuit in self-excitation, open-type is got and can be enclosed within on the high-tension line by CT, and open-type is got and can be adopted the low-voltage power Current Transformer by CT, because the employing wireless transmission, its current potential is suspend " virtual potential ".This design is being saved a large amount of expenses, and is being easy to install and fix aspect the body insulating Design.Getting can CT secondary output terminal shunt voltage spike absorb circuit and bidirectional triode thyristor Q1, by getting the electric energy that can CT be obtained from the high-tension line through bridge rectifier (four commutation diode D
1～4The formation bridge rectifier circuit) is input to power filter and anti-jamming circuit, its voltage is exported to the output voltage negative feedback and the mu balanced circuit of bidirectional triode thyristor and trigger circuit formation, adjust with line current by the ON time of automatic control bidirectional triode thyristor and to change, the energy conversion ratio changes thereupon, export at 10V to realize that power filter and anti-jamming circuit voltage are stable, and through power-switching circuit output burning voltage 3.3V.
This partial circuit is mainly finished from a high-tension line and is obtained certain energy, and converts the needed voltage of monitoring device to, satisfies the circuit power requirement.
In this current detecting Acquisition Circuit, the measurement in the present embodiment is adopted low-voltage power Current Transformer, precision 0.2 level capacity 5VA with CT, owing to adopt wireless transmission, its current potential is being saved a large amount of expenses, and is being easy to install and fix for suspending " virtual potential " aspect the body insulating Design.According to different requirements, the CT primary side is measured can refine to each capacitor branch road.As shown in Figure 4, the capacitive branch out-of-balance current is flowed through to measure and is used the CT primary side, series connection canonical measure resistance R 1 on the secondary side loop of current transformer, electric current is converted to voltage output through R1, C1 is a capacitance, add a direct current bias supply at C1 and R2 junction, finish conversion two, unipolar signal.Resistance R 2, R3, capacitor C 2, C3 and single supply rail-to-rail operation amplifier constitute second-order low-pass filter.Diode D1, stabilivolt D2 plays the input protection effect, and the signal of the AD module of assurance input CPU is in 0-3V, and R4, C4 form the low pass filter filters out circuit noise, and the high frequency interference of avoiding sealing in reduces sampling precision.
In cpu data acquisition control circuit and wireless transceiver circuit, as shown in Figure 5, the AD that electric current is finished in cpu data acquisition controlling unit exchanges collection, and carries out effective value and calculate and the current harmonics analysis.Adopt the low-consumption wireless Transmit-Receive Unit, realize the double-direction radio data transmission.Transmitting-receiving frequency is 433MHz, and communication distance is not less than 15 meters.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (9)
1. high-voltage capacitor bank branch current monitoring device is characterized in that: described monitoring device comprise self-excitation gets can and power-switching circuit, current detecting Acquisition Circuit, cpu data acquisition control circuit and wireless transceiver circuit.
2. device as claimed in claim 1 is characterized in that: energy is got in described self-excitation and power-switching circuit is obtained power supply and changed output dc voltage supplying electric current detection Acquisition Circuit and cpu data acquisition control circuit from high-tension line; The current detecting Acquisition Circuit is used for gathering, handling the branch current instantaneous value, and export the cpu data acquisition control circuit to, described cpu data acquisition control circuit is used to finish branch road out-of-balance current AD AC sampling, current harmonics calculates, and finishes the double-direction radio digital transmission through wireless transceiver circuit.
3. device as claimed in claim 1 is characterized in that: energy is got in described self-excitation and power-switching circuit comprises that current transformer, due to voltage spikes absorb circuit, output voltage feedback and mu balanced circuit, power filter and anti-jamming circuit and power-switching circuit.
4. device as claimed in claim 3, it is characterized in that: described self-excitation is got and can be absorbed circuit and bidirectional triode thyristor by circuit mutual inductor output terminal shunt voltage spike, the electric energy that the circuit mutual inductor is obtained is input to power filter and anti-jamming circuit through bridge rectifier, its voltage is exported to output voltage feedback and mu balanced circuit, and through power-switching circuit output burning voltage.
5. device as claimed in claim 4 is characterized in that: described output voltage negative feedback and mu balanced circuit comprise bidirectional triode thyristor and trigger circuit.
6. device as claimed in claim 4 is characterized in that: described power filter and anti-jamming circuit output burning voltage are 10V, and power-switching circuit output burning voltage is 3.3V.
7. device as claimed in claim 1 is characterized in that: described current detecting Acquisition Circuit comprises current transformer, measuring resistance, capacitance, low-pass filter and is used for diode, the stabilivolt of input protection.
8. device as claimed in claim 1 is characterized in that: described cpu data acquisition control circuit is used to finish the AD interchange collection of electric current, and carries out effective value and calculate and the current harmonics analysis.
9. device as claimed in claim 1 is characterized in that: described wireless transceiver circuit is the low-power consumption transceiving device, is used for the double-direction radio data transmission, and its transmitting-receiving frequency is 433MHz.
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Cited By (15)
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| CN102231515A (en) * | 2011-07-11 | 2011-11-02 | 中电普瑞科技有限公司 | Control protection method, device and system for series capacitor device |
| CN102928709A (en) * | 2012-10-31 | 2013-02-13 | 广东电网公司东莞供电局 | Three-phase harmonic wave-based method and system for detecting reactive compensation capacitor faults |
| CN103682988A (en) * | 2013-11-30 | 2014-03-26 | 中国西电电气股份有限公司 | Spark discharge gap triggering device and method for series compensation |
| WO2014086088A1 (en) * | 2012-12-06 | 2014-06-12 | 国家电网公司 | Device for measuring unbalanced current of common-tower double-circuit power transmission line |
| CN104076197A (en) * | 2014-07-14 | 2014-10-01 | 国家电网公司 | Unbalanced current testing device and method for capacitor bank |
| CN104253419A (en) * | 2014-09-11 | 2014-12-31 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Anti-disturbance tripping method for unbalance protection of high-voltage capacitor with inner fuse |
| CN104600682A (en) * | 2015-02-05 | 2015-05-06 | 湖北工业大学 | Active power filter current protection circuit and method |
| CN104635086A (en) * | 2015-02-06 | 2015-05-20 | 海盐凌云威电子有限公司 | Power grid line fault indicator control circuit |
| CN105717352A (en) * | 2016-02-04 | 2016-06-29 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Voltage detection unit of capacitor tower capacitance |
| CN105785109A (en) * | 2016-04-21 | 2016-07-20 | 国网辽宁省电力有限公司电力科学研究院 | Integrated device for current measurement, acquisition and energy obtaining for parallelly connected capacitors |
| CN105870934A (en) * | 2016-01-14 | 2016-08-17 | 国家电网公司 | Metal oxide varistor (MOV) based series compensation device |
| CN106546810A (en) * | 2017-01-23 | 2017-03-29 | 国网河南省电力公司检修公司 | A kind of alternating current filter capacitor bank out-of-balance current test device |
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| CN102231515A (en) * | 2011-07-11 | 2011-11-02 | 中电普瑞科技有限公司 | Control protection method, device and system for series capacitor device |
| CN102928709A (en) * | 2012-10-31 | 2013-02-13 | 广东电网公司东莞供电局 | Three-phase harmonic wave-based method and system for detecting reactive compensation capacitor faults |
| WO2014086088A1 (en) * | 2012-12-06 | 2014-06-12 | 国家电网公司 | Device for measuring unbalanced current of common-tower double-circuit power transmission line |
| CN103682988A (en) * | 2013-11-30 | 2014-03-26 | 中国西电电气股份有限公司 | Spark discharge gap triggering device and method for series compensation |
| CN104076197A (en) * | 2014-07-14 | 2014-10-01 | 国家电网公司 | Unbalanced current testing device and method for capacitor bank |
| CN104253419A (en) * | 2014-09-11 | 2014-12-31 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Anti-disturbance tripping method for unbalance protection of high-voltage capacitor with inner fuse |
| CN104600682B (en) * | 2015-02-05 | 2017-05-24 | 湖北工业大学 | Active power filter current protection circuit and method |
| CN104600682A (en) * | 2015-02-05 | 2015-05-06 | 湖北工业大学 | Active power filter current protection circuit and method |
| CN104635086A (en) * | 2015-02-06 | 2015-05-20 | 海盐凌云威电子有限公司 | Power grid line fault indicator control circuit |
| CN105870934A (en) * | 2016-01-14 | 2016-08-17 | 国家电网公司 | Metal oxide varistor (MOV) based series compensation device |
| CN105870934B (en) * | 2016-01-14 | 2018-07-31 | 国家电网公司 | A kind of series compensation device based on MOV |
| CN105717352A (en) * | 2016-02-04 | 2016-06-29 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Voltage detection unit of capacitor tower capacitance |
| CN105785109A (en) * | 2016-04-21 | 2016-07-20 | 国网辽宁省电力有限公司电力科学研究院 | Integrated device for current measurement, acquisition and energy obtaining for parallelly connected capacitors |
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