CN103454517B - Capacitance type potential transformer on-line monitoring method - Google Patents

Capacitance type potential transformer on-line monitoring method Download PDF

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Publication number
CN103454517B
CN103454517B CN201310260264.6A CN201310260264A CN103454517B CN 103454517 B CN103454517 B CN 103454517B CN 201310260264 A CN201310260264 A CN 201310260264A CN 103454517 B CN103454517 B CN 103454517B
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China
Prior art keywords
capacitance type
transformer
type potential
potential transformer
voltage
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CN201310260264.6A
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Chinese (zh)
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CN103454517A (en
Inventor
王岩
詹清华
林浩
李慧
彭飞进
胡聪
关敬棠
黄林
陈志平
张伟忠
何胜红
姜胜宝
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广东电网公司佛山供电局
中国电力科学研究院武汉分院
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Priority to CN201310260264.6A priority Critical patent/CN103454517B/en
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Abstract

A kind of capacitance type potential transformer on-line monitoring method, comprises step: the secondary voltage data of obtaining the capacitance type potential transformer of each transformer station in monitored area based on EMS; The converting equipment information that described secondary voltage data are corresponding with each transformer station is carried out associated; Judge the fault status information of described capacitance type potential transformer according to described secondary voltage data; Monitor the running status of the capacitance type potential transformer of the converting equipment of each transformer station in described monitored area according to described fault status information. Above-mentioned capacitance type potential transformer on-line monitoring method, without increasing hardware device, realize the real time on-line monitoring to capacitance type potential transformer running status, monitoring cost is low, and do not affect the operation of power system safety and stability, suitable in power system wide popularization and application.

Description

Capacitance type potential transformer on-line monitoring method
Technical field
The present invention relates to electric power project engineering field, particularly relate to a kind of capacitance type potential transformer and supervise onlineSurvey method.
Background technology
Capacitance type potential transformer (CapacitorVoltageTransformer, CVT) is widely used in electricityIn power system, be voltage supplied measurement, power observing and controlling, control, relay protection double as power line carrier automaticallyThe power equipment of the use of electric capacity, because its impact strength is little, volume is little, lightweight, in actual applications againReliably damping ferromagnetic resonance and the advantage that possesses good transient response characteristic, replace electromagnetic potential graduallyTransformer is a kind of requisite equipment in electrical network.
Capacitance type potential transformer, in running, may occur because of internal wetted, aging and internal electricalThe equipment deficiencies such as the dielectric loss that appearance component breakdown causes raises, secondary voltage is abnormal, can occur quick-fried when seriousFried, cause serious consequence. Therefore, need to monitor capacitance type potential transformer, can by monitoringGrasp the running status of capacitance type potential transformer, find in time capacitance type potential transformer fault, early rowExcept fault, thereby fault harm is dropped to minimum.
At present, also there is some on-line monitoring systems for capacitance type potential transformer and method in power system,But these methods are that to measure the electric current that flows through dielectric under phase voltage be basis, are mainly by rightCapacitance type potential transformer capacitance and dielectric loss value are monitored, calculate in conjunction with related algorithm, asImbalance compensation method, bridge method, zero passage comparison method or digital waveform method etc., calculate acquisition by signal detectionMonitoring result.
Due to need to be to be difficult to capacitance type potential transformer capacitance and the dielectric loss of Measurement accuracy in the methodValue is basis, cause the accuracy of capacitance type potential transformer monitoring and sensitivity to can not get effective guarantee andAnd when application need to have a power failure carries out corresponding hardware modification, complicated construction technique, cost are high, and hardware changesMake and can bring the problems such as difficult in maintenance, easily affect the security of operation of power system, therefore, be difficult at electric powerWide popularization and application in system.
Summary of the invention
Based on this, be necessary high for cost in prior art, easily to affect safe and stable operation problem,A kind of capacitance type potential transformer on-line monitoring method is provided.
A kind of capacitance type potential transformer on-line monitoring method, comprises the steps:
Obtain the secondary of the capacitance type potential transformer of each transformer station in monitored area based on EMSVoltage data;
The converting equipment information that described secondary voltage data are corresponding with each transformer station is carried out associated;
Judge the fault status information of described capacitance type potential transformer according to described secondary voltage data;
Monitor the electric capacity of the converting equipment of each transformer station in described monitored area according to described fault status informationThe running status of formula voltage transformer.
Above-mentioned capacitance type potential transformer on-line monitoring method, the secondary voltage obtaining based on EMSData, the secondary voltage data converting equipment information corresponding with each transformer station is carried out associated, and according to obtainingThe secondary voltage data of getting judge the fault status information of capacitance type potential transformer, thereby realize monitoring electric capacityThe running status of formula voltage transformer. Without increasing hardware device, realize capacitance type potential transformer has been transportedThe real time on-line monitoring of row state, monitoring cost is low, and does not affect the operation of power system safety and stability,Suitable in power system wide popularization and application.
Brief description of the drawings
Fig. 1 is the capacitance type potential transformer on-line monitoring method flow chart of an embodiment.
Detailed description of the invention
Detailed description of the invention below in conjunction with accompanying drawing to capacitance type potential transformer on-line monitoring method of the present inventionBe described in detail.
Shown in Figure 1, Fig. 1 is the capacitance type potential transformer on-line monitoring method flow process of an embodimentFigure, comprises the steps;
S1: the capacitor voltage that obtains each transformer station in monitored area based on EMS (EMS)The secondary voltage data of transformer.
In one embodiment, the process that described step S1 obtains secondary voltage data comprises the steps:
S101, utilize the signal biography being installed on the capacitance type potential transformer of each transformer station monitored area inSensor gathers secondary voltage.
The effect of signal transducer is that the capacitance type potential transformer secondary voltage data of scene operation are adoptedCollection. Preferably, the precision of the signal transducer using can be 0.2 grade, i.e. the mistake of measured value and actual valueDifference is less than 0.2%, is 1% because the capacitance type potential transformer fault of EMS setting detects precision,Therefore adopt the precision of above-mentioned signal transducer can meet the requirement of EMS.
S102, by EMS periodic polls and gather each transformer station signal transducer obtainSecondary voltage data are also kept in database.
This step is mainly that the signal of sensor is gathered and transmitted, and obtains by periodic polls modeData volume more complete, the signals collecting time interval is ms level, gets a hundreds of data each second, thus canMeet the demand of EMS to data volume, realize capacitance type potential transformer secondary voltage data realIn time, obtains.
S2: the converting equipment information that described secondary voltage data are corresponding with each transformer station is carried out associated.
In one embodiment, in described S2, associated process comprises the steps:
S201, draw the wiring topological diagram of the capacitance type potential transformer of each transformer station in described monitored area.
S202, obtain from equipment account system according to the capacitance type potential transformer of described wiring topological diagram eachThe converting equipment information that individual transformer station is corresponding.
S203, the secondary voltage data of each capacitance type potential transformer and described converting equipment information are carried outAssociated.
Owing to not having capacitance type potential transformer in the primary connection figure of EMS, therefore, canEquipment concrete with it the capacitance type potential transformer secondary voltage data of collection is carried out associated. First drawThe capacitance type potential transformer primary connection topological diagram of all transformer stations in monitored area, then bonding apparatus platformIt is right with it that account system realizes capacitance type potential transformer secondary voltage data in the database of EMSThe association of the converting equipment of answering, obtains capacitance type potential transformer topological diagram.
Establish by the capacitance type potential transformer secondary voltage data power transformation corresponding with it of setting up wiring topological diagramAssociation between standby information, for the running status of every capacitance type potential transformer of Real-Time Monitoring provides foundation,Make the fault status information of capacitance type potential transformer can obtain correct decision.
S3: the fault status information that judges described capacitance type potential transformer according to described secondary voltage data.
In this step, be mainly that the secondary voltage data that are kept in database by utilization carry out judgements placeReason is to reach the object of fault distinguishing.
In one embodiment, in step S3, judge the fault status information of described capacitance type potential transformerStep, specifically comprises:
Obtain the secondary voltage data of the capacitance type potential transformer of each transformer station.
Obtain the capacitance type potential transformer of the same type with testing capacitance formula voltage transformer; Preferably, firstDetermine the type of testing capacitance formula voltage transformer, then look into from described capacitance type potential transformer topological diagramFind the capacitance type potential transformer of the same type with described testing capacitance formula voltage transformer.
By the secondary voltage of described testing capacitance formula voltage transformer and described capacitor voltage mutual inductance of the same typeThe secondary voltage of device compares.
If the secondary voltage between this testing capacitance formula voltage transformer and capacitance type potential transformer of the same typeVoltage deviation value is all greater than setting threshold values, and in this capacitance type potential transformer and setting-up time section beforeSecondary voltage deviate is greater than described setting threshold values, judges that this capacitance type potential transformer is in malfunction.
Due to the different demands of Operation of Electric Systems, the mounting means meeting of capacitance type potential transformer in transformer stationThere are differences, generally, capacitance type potential transformer all can be installed on the three-phase of transformer station's median generatrix,For 500kV bus, on the three-phase of its each outlet, capacitance type potential transformer can be installed, and for 220kVAnd with Down Highway, in its outlet, conventionally only on single-phase, capacitance type potential transformer is installed, and therefore, for upperState situation, judge the fault status information of capacitance type potential transformer, can comprise following two kinds of modes:
(1) obtain the secondary voltage of single-phase capacitance type potential transformer of the same type in the outlet of substation bus barData; By two of the secondary voltage of testing capacitance formula voltage transformer and capacitance type potential transformer of the same typeInferior voltage compares; In setting-up time section, if of the same type on this capacitance type potential transformer and homophaseSecondary voltage voltage deviation value between capacitance type potential transformer is all greater than setting threshold values, and this condenser typeSecondary voltage deviate before voltage transformer and self in setting-up time section is greater than described setting threshold values,Judge that this capacitance type potential transformer is in malfunction.
For example, capacitance type potential transformer is installed in 220kV substation bus bar and outlet on uniline, willThis capacitance type potential transformer secondary voltage and the corresponding bus phase homophase appearance formula voltage transformer that powers on carries out voltageRelatively, if its secondary voltage deviate exceedes the threshold values of setting, and by before secondary voltage numerical value and selfThe secondary voltage value of setting in the period compares, if its secondary voltage deviate also exceedes the threshold values of setting,Judge that fault has occurred this capacitance type potential transformer.
(2) obtain the secondary voltage data of each phase capacitance type potential transformer in the outlet of substation bus bar; WillThe secondary voltage of the secondary voltage of testing capacitance formula voltage transformer and capacitance type potential transformer of the same type entersRow relatively; If the secondary voltage between the capacitance type potential transformer on this capacitance type potential transformer and homophaseVoltage deviation value is all greater than setting threshold values, and this capacitance type potential transformer and setting-up time section before selfInterior secondary voltage deviate is greater than described setting threshold values, judges that this capacitance type potential transformer is in faultState.
For example, many capacitance type potential transformers are installed, by these in 500kV substation bus bar and outletIn capacitance type potential transformer, capacitance type potential transformer secondary voltage of the same type carries out in real time mutually relatively,If the secondary voltage deviate of certain capacitance type potential transformer of certain type and other capacitance type potential transformer(voltage difference/secondary voltage value) all exceedes the threshold values of setting within the time of setting, and by secondary voltageNumerical value and the secondary voltage value of setting in the period before self compare, if its secondary voltage deviate is also superCross the threshold values of setting, judge that fault has occurred this capacitance type potential transformer.
In the present embodiment, according to the requirement of capacitance type potential transformer operation, choose one can reflect each twoThe secondary voltage deviate of the capacitance type potential transformer fault of inferior electric pressure (for example 0.5%) is as threshold values,Mutually compare in real time and separate unit capacitance type potential transformer two by many capacitance type potential transformer secondary voltagesThe mode that the secondary voltage of inferior voltage different time sections relatively combines is each other differentiated capacitance type potential transformerFault status information.
S4: monitor the converting equipment of each transformer station in described monitored area according to described fault status informationThe running status of capacitance type potential transformer.
In this step, record the running status of capacitance type potential transformer overall process, and pass through preceding stepFault status information differentiate, Real-Time Monitoring is wanted the electric capacity of the converting equipment of each transformer station in monitored areaThe running status of formula voltage transformer, for accident analysis and troubleshooting provide technical support.
Further, be directed to the malfunction that above-mentioned differentiation obtains, by the capacitive battery of described generation faultPress transformer to show on capacitance type potential transformer topological diagram. By capacitance type potential transformer topologyFigure can show the capacitance type potential transformer of the converting equipment of each transformer station in monitored area, and by referring toThe mode such as lamp or highlighted demonstration of showing displays the capacitance type potential transformer of fault.
In addition, in the time having determined capacitance type potential transformer in malfunction, carry out corresponding alarm, realNow warning function fast.
The capacitance type potential transformer on-line monitoring method of above-described embodiment, utilizes the hardware of EMSEquipment, moves secondary voltage data as basis taking the capacitance type potential transformer of EMS, is not increasingAdd under the condition of monitoring hardware, the capacitance type potential transformer of each transformer station in monitored area is carried out in real timeOn-line monitoring, the fault using the secondary voltage data of capacitance type potential transformer as capacitance type potential transformerCharacteristic quantity, and set up fault judgment models, by many capacitance type potential transformer secondary voltages in real time mutually thanAnd the mode that compares each other of separate unit capacitance type potential transformer secondary voltage different time data, judge electric capacityThe malfunction of formula voltage transformer, maintenance is simple, cost is low, avoids the safety and stability fortune to power systemThe impact of row, the accuracy and the sensitivity that have improved on-line monitoring.
Technology of the present invention, the capacitance type potential transformer on-line monitoring based on EMS data, can realize electricityThe running status of appearance formula voltage transformer is carried out real time on-line monitoring, finds that timely and effectively capacitor voltage is mutualThe fault of sensor, reduces loss. Can effectively understand capacitance type potential transformer by system occurs simultaneouslyThe process of fault, is conducive to analyze its cause of accident, for improving the reliable of capacitance type potential transformerProperty tool is of great significance.
For example, a 500kV transformer station, carries the circuit of 1000MW load for one, when this line electricityWhen the C2 of appearance formula voltage transformer punctures an element, Turn Ratio Changing 2.82%, one day 24h, will lack meter3360*10*10*10 degree electricity, within one day, economic loss can reach 1,680,000 yuan. Visible, can do sth. in advance to find for one day eventBarrier, just can lose 1,680,000 yuan of electricity price losses less, and economic benefit is very huge, and promotion prospect is huge.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed,But can not therefore be interpreted as the restriction to the scope of the claims of the present invention. It should be pointed out that for this areaThose of ordinary skill, without departing from the inventive concept of the premise, can also make some distortion andImprove, these all belong to protection scope of the present invention. Therefore, the protection domain of patent of the present invention should be with appendedClaim is as the criterion.

Claims (5)

1. a capacitance type potential transformer on-line monitoring method, is characterized in that, comprises the steps:
Obtain the secondary of the capacitance type potential transformer of each transformer station in monitored area based on EMSVoltage data;
The converting equipment information that described secondary voltage data are corresponding with each transformer station is carried out associated; Concrete bagDraw together: the wiring topological diagram of drawing the capacitance type potential transformer of each transformer station in described monitored area; According toIt is corresponding that the capacitance type potential transformer of described wiring topological diagram obtains each transformer station from equipment account systemConverting equipment information; By the secondary voltage data of each capacitance type potential transformer and described converting equipment informationCarry out association and obtain capacitance type potential transformer topological diagram;
Judge the fault status information of described capacitance type potential transformer according to described secondary voltage data; SpecificallyComprise: the secondary voltage data of obtaining the capacitance type potential transformer of transformer station; Obtain and testing capacitance formula electricityPress transformer capacitance type potential transformer of the same type; By the secondary electricity of described testing capacitance formula voltage transformerPress with the secondary voltage of described capacitance type potential transformer of the same type and compare; If this testing capacitance formula electricityPress the secondary voltage voltage deviation value between transformer and capacitance type potential transformer of the same type to be all greater than settingThreshold values, and this capacitance type potential transformer is greater than institute with the secondary voltage deviate in setting-up time section beforeState setting threshold values, judge that this capacitance type potential transformer is in malfunction;
Monitor the electric capacity of the converting equipment of each transformer station in described monitored area according to described fault status informationThe running status of formula voltage transformer.
2. capacitance type potential transformer on-line monitoring method according to claim 1, is characterized in that,The described secondary that obtains the capacitance type potential transformer of each transformer station in monitored area based on EMSThe step of voltage data comprises:
Utilization is installed on the signal transducer pair on the capacitance type potential transformer of each transformer station in monitored areaSecondary voltage gathers;
Signal transducer by each transformer station of EMS periodic polls also gathers voltage signal and obtainsObtain secondary voltage data and be kept in database.
3. capacitance type potential transformer on-line monitoring method according to claim 1, is characterized in that,The described step of obtaining the capacitance type potential transformer of the same type with testing capacitance formula voltage transformer comprises:
Determine the type of testing capacitance formula voltage transformer;
Find with described testing capacitance formula voltage transformer same from described capacitance type potential transformer topological diagramThe capacitance type potential transformer of type.
4. capacitance type potential transformer on-line monitoring method according to claim 1, is characterized in that,Also comprise:
By the capacitance type potential transformer of described generation fault at described acquisition capacitance type potential transformer topological diagramOn show.
5. capacitance type potential transformer on-line monitoring method according to claim 1, is characterized in that,Also comprise:
In the time having determined capacitance type potential transformer in malfunction, carry out corresponding alarm.
CN201310260264.6A 2013-06-26 2013-06-26 Capacitance type potential transformer on-line monitoring method CN103454517B (en)

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104034977B (en) * 2014-05-29 2016-09-07 国家电网公司 Capacitance type potential transformer live detection instrument
CN105182268A (en) * 2014-05-29 2015-12-23 国网山西省电力公司电力科学研究院 Method and device for monitoring operating state of capacitor voltage transformer
FR3022342B1 (en) * 2014-06-13 2016-07-01 Fogale Nanotech Method for real-time monitoring of the operating state of a capacitive sensor
CN105203886A (en) * 2015-10-16 2015-12-30 江苏省电力公司淮安供电公司 Capacitive type current transformer online detection device and method
CN105548943B (en) * 2016-01-25 2018-06-19 中国南方电网有限责任公司超高压输电公司梧州局 A kind of CVT capacitance on-line monitoring methods based on the monitoring of CVT secondary voltages
CN106646319B (en) * 2016-10-09 2019-03-19 国网江苏省电力公司电力科学研究院 Electronic type voltage transformer exception discrimination method based on combined measurement in standing
CN107607764B (en) * 2017-05-17 2020-08-04 广东电网有限责任公司佛山供电局 Multi-path capacitive voltage transformer real-time detection device
CN107657121A (en) * 2017-09-29 2018-02-02 广州民航职业技术学院 Aircaft configuration performance prediction processing method and system based on corrosion level evaluation

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1349103A (en) * 2000-10-18 2002-05-15 深圳市中兴通讯股份有限公司 Judgement method of one-phase earthing failure in electric distribution network
CN201110893Y (en) * 2007-07-20 2008-09-03 太原市优特奥科电子科技有限公司 High voltage potential transformer secondary circuit pressure-drop electric energy metering error real time monitoring device
CN201607492U (en) * 2010-03-08 2010-10-13 广东电网公司中山供电局 Fault pre-alarm system for 10-kV power capacitor
CN102280864A (en) * 2011-08-10 2011-12-14 江苏省电力公司苏州供电公司 Post-failure live treatment method for protection device of distribution network system and portable protection device
CN102707178A (en) * 2012-06-15 2012-10-03 中国电力科学研究院 Method for prewarning and monitoring failures of secondary equipment of power system
CN102879630A (en) * 2012-09-17 2013-01-16 浙江省电力公司电力科学研究院 Capacitive voltage transformer failure monitoring instrument

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5956171A (en) * 1982-09-25 1984-03-31 Toshiba Corp Equipment system monitoring device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1349103A (en) * 2000-10-18 2002-05-15 深圳市中兴通讯股份有限公司 Judgement method of one-phase earthing failure in electric distribution network
CN201110893Y (en) * 2007-07-20 2008-09-03 太原市优特奥科电子科技有限公司 High voltage potential transformer secondary circuit pressure-drop electric energy metering error real time monitoring device
CN201607492U (en) * 2010-03-08 2010-10-13 广东电网公司中山供电局 Fault pre-alarm system for 10-kV power capacitor
CN102280864A (en) * 2011-08-10 2011-12-14 江苏省电力公司苏州供电公司 Post-failure live treatment method for protection device of distribution network system and portable protection device
CN102707178A (en) * 2012-06-15 2012-10-03 中国电力科学研究院 Method for prewarning and monitoring failures of secondary equipment of power system
CN102879630A (en) * 2012-09-17 2013-01-16 浙江省电力公司电力科学研究院 Capacitive voltage transformer failure monitoring instrument

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Address after: 528011 No. 1 South Fenjiang Road, Chancheng District, Guangdong, Foshan

Co-patentee after: China Electric Power Research Institute, Wuhan Branch

Patentee after: FOSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID CORPORATION

Address before: 528000 Fenjiang South Road, Chancheng District, Guangdong, No. 1, No.

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Patentee before: Foshan Power Supply Bureau, Guangdong Power Grid Corporation

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