CN104111392A - 35-kV capacitor bank online monitoring and alarming device - Google Patents
35-kV capacitor bank online monitoring and alarming device Download PDFInfo
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- CN104111392A CN104111392A CN201410338039.4A CN201410338039A CN104111392A CN 104111392 A CN104111392 A CN 104111392A CN 201410338039 A CN201410338039 A CN 201410338039A CN 104111392 A CN104111392 A CN 104111392A
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Abstract
Disclosed is a 35-kV capacitor bank online monitoring and alarming device. The 35-kV capacitor bank online monitoring and alarming device comprises a current in situ signal collecting device and a remote online alarming and monitoring terminal. The current in situ signal collecting device comprises an in situ signal collecting cabinet and a communication cabinet; an ABC three-phase connecting aluminum bar, which is connected at the tail end of the 35-kV capacitor bank online monitoring and alarming device in a star mode, is provided with a current sensor and the like. The 35-kV capacitor bank online monitoring and alarming device omits periodic power-off prerun of monitored programs of a device to be monitored and can effectively diagnose capacitors to fault online and issue alarm to remind operating departments to draw up plans in advance and replace the capacitor to fault, thereby avoiding accidents and losses. By mining historic data, operators can analyze how to improve the service life of the capacitors.
Description
Technical field
The invention belongs to the primary equipment monitoring and protecting in high voltage power transmission technology, particularly a kind of on-line monitoring prior-warning device technical field of structures of each crosstalk container of 35kV power capacitor bank.
Background technology
Power capacitor is of many uses in electric system, is most important operation element in electric system.Power capacitor is in operation except bearing for a long time operating voltage, is also subject to various interior external overvoltage effects and aging gradually.Under service condition, power capacitor directly connects with transmission line of electricity, while adopting conventional sense method to detect power capacitor, must make that whole transmission line of electricity is out of service just can carry out, and has affected production.And every year all once because the difficulty that has a power failure causes the preventative leakage examination of power capacitor, this also leaves hidden danger to the safe operation of power capacitor.Certain capacitor in capacitor group damages while causing whole group of electric capacity tripping operation, and other electric capacity may damage because being hit, and the quick-fried fault of capacitor cohort can occur severe patient, has expanded scope and the impact of accident.Except equipment failure loss, the interim electric capacity breakdown repair increasing has disturbed the schedule work arrangement of operation department, has increased work load.
Power capacitor is as the important device of power system reactive power compensation, harmonic carcellation, the normal operation of capacitor group all plays an important role for the quality and efficiency of electric system electric energy, but the design and operation condition each side due to capacitor itself, causes the spoilage of capacitor higher.Fault common during electric capacitor operation is as follows.
(1) environment temperature: the temperature of capacitor surrounding environment is too high or too low.If environment temperature is too high, the heat producing during electric capacity work is loose not going out just: if environment temperature is too low, the oil in capacitor just may freeze, easily electric breakdown.
(2) working temperature: capacitor when work, the temperature of its interior media should be lower than 65 ℃, the highlyest must not surpass 70 ℃, otherwise can cause thermal breakdown, or causes bulge phenomenon.
(3) operating voltage: capacitor is very responsive to voltage, because the loss of capacitor is directly proportional to voltage squared, superpotential can make capacitor heating serious, capacitor insulation meeting accelerated deterioration, the lost of life, even electric breakdown.
(4) working current and harmonic problem: when capacitor installment work is on the electrical network that contains " harmonic sources " such as saturation core regulator, large-scale rectifier and electric arc furnaces, in alternating current, just there will be higher hamonic wave.For nth harmonic, the 1/n of the reactance of capacitor when being first-harmonic, therefore. harmonic wave is very serious on the impact of electric current.This electric current of harmonic wave is very harmful to capacitor.The as easy as rolling off a log capacitor breakdown that makes causes phase fault.
(5) while cutting capacitor group, because the isolating switch superpotential of restriking causing of restriking causes insulation harm between capacitor pole even to puncture.Some capacitor groups, without any overvoltage protection measure, also without current-limiting reactor, are especially filled with season in agriculture, and operate 1 average every day, just more easily cause its insulation harm.Even set off an explosion.
For grasping in real time the operating condition of power capacitor, need to gather capacitor discharge voltage and branch road offset current, by computational analysis, go out actual capacitance value, electric current and voltage harmonic waves etc. carry out on-line monitoring with parameters such as the closely-related values of electric capacity safe operation, inline diagnosis has soon capacitor the early warning of fault, remind operation department to make a plan in advance to change this to be about to the capacitor of fault, trouble-saving generation, avoids the loss of accident.In addition, remind operation department to formulate measures to rectify and reform, improve capacitance operation environment, extend electric capacity serviceable life.
Summary of the invention
The present invention proposes a kind of 35kV capacitor group string on-line monitoring prior-warning device.Can realize the online early warning and monitoring function to functions such as the capacitance of each crosstalk container of 35kV capacitor group, dielectric loss variation, harmonic voltage and harmonic currents.The present invention adopts radio flow sensor to realize collection and the transmission to each crosstalk condenser current of 35kV capacitor group, has overcome high pressure secondary terminals extension line is discharged and causes the potential potential safety hazard of short circuit; The present invention has realized the synchronous acquisition to each crosstalk condenser voltage of 35kV capacitor group, electric current by capacitor group in-site collecting case, optically-coupled isolation operational amplifier in communication box, monitor signal is converted into light signal, by the interior on-line monitoring screen communication of single-mode fiber and station.Intelligent online monitoring screen is by calculating each crosstalk container variation in capacitance value, active power deviation and harmonic voltage and harmonic current, when deviate higher than set limit value time, send out alarm signal to supervisory control of substation backstage, realize the early warning to capacitor group fault.
The technical solution used in the present invention is, a kind of 35kV capacitor group on-line monitoring prior-warning device, and this 35kV capacitor group on-line monitoring prior-warning device comprises electric current signal pickup assembly and remote online early warning and monitoring terminal on the spot; Electric current on the spot signal pickup assembly also comprises signals collecting case and communication box on the spot; A, B, the C tri-connecting at the end star of this 35kV capacitor group on-line monitoring prior-warning device aluminium row that is connected locates to install current sensor, this current transformer adopts bayonet type, A, B, C tri-are connected aluminium row through its boring place, and the current signal of collection is delivered to corresponding unit signals collecting case by wireless mode after being converted into the little electric current of secondary side; Each cell signal vasculum is collected to after communication box, by optical cable remote transmission to remote online early warning and monitoring terminal.
Electric current of the present invention on the spot signal pickup assembly is arranged on monitored capacitor group safe fence; Signals collecting case comprises electric current, voltage acquisition unit, collection signal processing unit, LED light, power supply unit on the spot; Power supply unit consists of alterating and direct current source interface and switch power module, and power supply is connected with switch power module by alterating and direct current source interface, and switch power module is connected with collection signal processing unit, data transmission unit, LED light respectively; Collection signal processing unit is is sequentially connected and composed by sensor, electric current, voltage changer, optocoupler type isolation operational amplifier, A/D converter; Data transmission unit consists of as PORT COM, analog input interface and digital data transmission interface Ethernet ICP/IP protocol module.
The number of signals collecting case voltage sensor interface of the present invention is 2 * 3+1 totally 7 collection of simulant signal.
The number of signals collecting case digital signal output interface of the present invention is 1.
35kV capacitor group on-line monitoring prior-warning device of the present invention to time signal input, output interface number be 1 pair, adopt B code to time.
The number of 35kV capacitor group on-line monitoring prior-warning device alarm signal interface of the present invention is 2 pairs.
Current sensor of the present invention is radio flow sensor, and signals collecting case can be realized the synchronous acquisition to wireless current signal and wired voltage signal.
The invention has the beneficial effects as follows:
1. communicator provides 4 input interfaces 1 output interface, and by fiber optic cable communications, separate unit remote online monitoring prior-warning device can complete the on-line monitoring early warning of 4 group capacitor groups simultaneously, cost-saving, saves installing space;
2. the power module of this device offers 220V ± 40V and exchanges access way power supply, and scope is wide, and width is large, is convenient to choose;
3. remote monitoring prior-warning device provides 2 tunnel transmission channels, warning information can be delivered to transformer station backstage by analog channel, also can be passed through internet access technology superintendent office background server, facilitate technician's monitoring in real time and analyze and save data;
4. analog signal channel directly accesses the public measurement and control unit of transformer station, and the transmission and the processing that through it, complete data, utilized existing device in transformer station to a great extent, economizes on resources;
5. monitor signal adopts the isolation of photoelectricity coupling type on the spot, has improved device anti-electromagnetic interference capability;
After 6.35kV capacitor group On-line Fault monitoring warning device puts into operation, the monitoring project of monitored equipment is not needed to arrange the prerun that periodically has a power failure, effectively inline diagnosis has soon capacitor the early warning of fault, remind operation department to make a plan in advance to change this and be about to the capacitor of fault, trouble-saving generation, avoids the loss of accident.By the excavation to historical data, can analyze the serviceable life of how to improve capacitor.
The present invention carries out on-line monitoring early warning to parameters such as the electric capacity actual value of 35kV power capacitor, electric current and voltage harmonic waves, and on-line monitoring system need be realized following technical indicator:
1) realize 0.5 grade of requirement of current sample precision;
2) realize 0.5 grade of requirement of voltage sample precision;
3) realize hard contact and report and submit scheduling station function;
4) realize teledata inquiry and warning query function;
5) realize each crosstalk capacity on-line monitoring of 35kV capacitor group, off-limit alarm function;
6) realize 35kV capacitor group and respectively go here and there harmonic voltage and harmonic current on-line monitoring, off-limit alarm function.
Accompanying drawing explanation
Fig. 1 is the technical scheme structural drawing of capacitor group on-line monitoring prior-warning device;
Fig. 2 is the structural drawing of signals collecting case;
Fig. 3 is the structural drawing of on-line monitoring screen.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further elaborated.
Capacitor group on-line monitoring prior-warning device is by 4 signals collecting casees, and 1 communication box and 1 on-line monitoring screen form, as shown in Figure 1.
Monitoring device gathers capacitances in series group electric discharge PT voltage and compensation branch current, by computational analysis, go out actual capacitance value, electric current and voltage harmonic wave etc. and the closely-related value of electric capacity safe operation, by isolation optical fiber, send the capacitor on-line monitoring in master-control room in station back to and shield, monitoring screen can store, and calculates, set, show all data, and can pass through as required USB mouth derived data, and complete local alarm and telemechanical alarm according to setting threshold values.According to transformer station to time requirement, monitoring screen can complete clock by IRIG interface and proofread.
(1) signals collecting case
Signals collecting case is comprised of 2 NEMU-IP-4001 electricity information acquisition units and peripheral cell thereof, and Fig. 2 is shown in by structural drawing.Electricity information acquisition unit gathers respectively upper and lower two serial capacitors group voltages, and the electric current input of two collecting units adopts series system.Collecting unit is used RS485 as PORT COM, need to carry out shielding.220VAC or direct current in station are used in power supply, and in case, electric power incoming line installs surge protector additional.
Signals collecting case is installed on the safe fence of outdoor each electric capacity chamber, gathers respectively three-phase voltage and capacitance group branch road three-phase current from each chamber capacitor discharge PT.35kV capacitor discharge PT has two groups of secondary winding, u1, and u2, u3 is the secondary output of terminal voltage in series connection group, u4, u5, u6 is the secondary output of terminal voltage under series connection group, no-load voltage ratio is 35kV/2/0.1kV.I1, i2, i3 is capacitance group branch current, uses 35kV Open Type Electric Current Mutual Inductor to be arranged on capacitance group bus-bar.
(2) communication box
Communication box front end is RS485 network, adopts daisy chain structure and the communication of 4 signals collecting casees, every
1minute gather a secondary data; And convert light signal to, by the interior on-line monitoring screen communication of single-mode fiber and station.The effective communication distance of single-mode fiber can reach 2km.Use optical fiber component outdoor high-voltage and station equipment can be isolated effectively.Communication box turns optic module by 1 RS485 and periphery forms, and is arranged on safe fence.
(3) on-line monitoring screen
Electric capacity on-line monitoring screen is by 1 SBC6345 single card microcomputer, and 1 RS485 turns optic module, 1 NKSDIO and panel leds, and the compositions such as relay, Fig. 3 is shown in by its structural drawing.
Optic module carrys out front end communication box light signal by Optical Fiber Transmission is converted to RS485 signal, gives single card microcomputer.
USB mouth by single card microcomputer can be derived the numerical value such as electric capacity current state and historic state.
Because its IO writes driving more complicated, therefore 1 PTSDIO of expansion is as input-output device.Single card microcomputer is by RS232 mouth and PTSDIO communication, the major function of PTSDIO module be receive from station to time operate, by level conversion and decoding, obtain temporal information, and send single card microcomputer to; And drive relay and pilot lamp etc., when plant failure or capacitor alarm, can to public observing and controlling, shield by output relay contact point signal, and light corresponding pilot lamp.
the feature of device on-line monitoring
(1) sampling precision is high
Adopting CT model is LDK4-35, and this CT class of accuracy is 0.2 grade, meets 0.5 grade of requirement of current sample precision;
Adopt capacitor set discharge PT secondary voltage sampling value to participate in the calculating of condenser capacity, the precision of electric discharge PT is 0.5 grade, meets 0.5 grade of requirement of voltage sample precision.
(2) reliable signal transmission form
Because the parameter that monitor electrical measurement unit is more, data volume is large, very high for the rate requirement of communication, therefore traditional low transfer rate communication modes such as RS485 can not be satisfied the demand.Contrive equipment adopts ethernet technology transmission data to monitoring terminal on the spot, guarantee each signal parameter accurately, transmission at high speed.
the man-machine interaction of on-line monitoring prior-warning device and data management technique feature
(1) adopt resistance type touch control screen, interface operation, than traditional button operation more convenient and quicker, can meet abundanter man-machine interaction demand;
(2) be provided with historical data base and be used for saving historical data, can browse overview by local touch screen, also can derive detailed data by USB, for saving historical data of off-line analysis and longer time;
(3) management of the access control of system supported data object, mandate and authority, meets high reliability;
(4) the automatic hold function in historical data property performance period ground, adopts circulation storage mode, automatically deletes legacy data;
(5) provide real-time tendency and the historical trend curve of multiple electric parameter;
(6) possess the functions such as the device parameter of setting, alarm definite value.
Claims (7)
1. a 35kV capacitor group on-line monitoring prior-warning device, is characterized in that, this 35kV capacitor group on-line monitoring prior-warning device comprises electric current signal pickup assembly and remote online early warning and monitoring terminal on the spot; Electric current on the spot signal pickup assembly also comprises signals collecting case and communication box on the spot; A, B, the C tri-connecting at the end star of this 35kV capacitor group on-line monitoring prior-warning device aluminium row that is connected locates to install current sensor, this current transformer adopts bayonet type, A, B, C tri-are connected aluminium row through its boring place, and the current signal of collection is delivered to corresponding unit signals collecting case by wireless mode after being converted into the little electric current of secondary side; Each cell signal vasculum is collected to after communication box, by optical cable remote transmission to remote online early warning and monitoring terminal.
2. a kind of 35kV capacitor group on-line monitoring prior-warning device according to claim 1, is characterized in that, electric current on the spot signal pickup assembly is arranged on monitored capacitor group safe fence; Signals collecting case comprises electric current, voltage acquisition unit, collection signal processing unit, LED light, power supply unit on the spot; Power supply unit consists of alterating and direct current source interface and switch power module, and power supply is connected with switch power module by alterating and direct current source interface, and switch power module is connected with collection signal processing unit, data transmission unit, LED light respectively; Collection signal processing unit is is sequentially connected and composed by sensor, electric current, voltage changer, optocoupler type isolation operational amplifier, A/D converter; Data transmission unit consists of as PORT COM, analog input interface and digital data transmission interface Ethernet ICP/IP protocol module.
3. a kind of 35kV capacitor group on-line monitoring prior-warning device according to claim 1, is characterized in that, the number of signals collecting case voltage sensor interface is 2 * 3+1 totally 7 collection of simulant signal.
4. a kind of 35kV capacitor group on-line monitoring prior-warning device according to claim 1, is characterized in that, the number of signals collecting case digital signal output interface is 1.
5. a kind of 35kV capacitor group on-line monitoring prior-warning device according to claim 1, is characterized in that, this 35kV capacitor group on-line monitoring prior-warning device to time signal input, output interface number be 1 pair.
6. a kind of 35kV capacitor group on-line monitoring prior-warning device according to claim 1, is characterized in that, the number of this 35kV capacitor group on-line monitoring prior-warning device alarm signal interface is 2 pairs.
7. a kind of 35kV capacitor group on-line monitoring prior-warning device according to claim 1, is characterized in that, current sensor is radio flow sensor, and signals collecting case can be realized the synchronous acquisition to wireless current signal and wired voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410338039.4A CN104111392A (en) | 2014-07-16 | 2014-07-16 | 35-kV capacitor bank online monitoring and alarming device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410338039.4A CN104111392A (en) | 2014-07-16 | 2014-07-16 | 35-kV capacitor bank online monitoring and alarming device |
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| CN104111392A true CN104111392A (en) | 2014-10-22 |
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| CN201410338039.4A Pending CN104111392A (en) | 2014-07-16 | 2014-07-16 | 35-kV capacitor bank online monitoring and alarming device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US9651597B1 (en) | 2016-06-22 | 2017-05-16 | General Electric Company | Systems and methods for monitoring capacitor banks |
| CN106771801A (en) * | 2016-11-28 | 2017-05-31 | 国家电网公司 | A kind of capacitor bank on-Line Monitor Device and its application process |
| CN108469586A (en) * | 2018-06-04 | 2018-08-31 | 沈阳工业大学 | A kind of inspection of high speed grounding switch Interruption performance and judgment means and method |
| US10254323B2 (en) | 2016-06-30 | 2019-04-09 | General Electric Company | Passive wireless monitoring of individual capacitor cans |
| CN112345865A (en) * | 2020-11-10 | 2021-02-09 | 内蒙古科技大学 | Power capacitor running state online evaluation early warning device and method |
-
2014
- 2014-07-16 CN CN201410338039.4A patent/CN104111392A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US9651597B1 (en) | 2016-06-22 | 2017-05-16 | General Electric Company | Systems and methods for monitoring capacitor banks |
| US10254323B2 (en) | 2016-06-30 | 2019-04-09 | General Electric Company | Passive wireless monitoring of individual capacitor cans |
| CN106771801A (en) * | 2016-11-28 | 2017-05-31 | 国家电网公司 | A kind of capacitor bank on-Line Monitor Device and its application process |
| CN108469586A (en) * | 2018-06-04 | 2018-08-31 | 沈阳工业大学 | A kind of inspection of high speed grounding switch Interruption performance and judgment means and method |
| CN108469586B (en) * | 2018-06-04 | 2023-08-08 | 沈阳工业大学 | Device and method for checking and judging on-off characteristics of quick grounding switch |
| CN112345865A (en) * | 2020-11-10 | 2021-02-09 | 内蒙古科技大学 | Power capacitor running state online evaluation early warning device and method |
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Application publication date: 20141022 |