CN103454517A - Method for online monitoring capacitive voltage transformers - Google Patents

Method for online monitoring capacitive voltage transformers Download PDF

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Publication number
CN103454517A
CN103454517A CN2013102602646A CN201310260264A CN103454517A CN 103454517 A CN103454517 A CN 103454517A CN 2013102602646 A CN2013102602646 A CN 2013102602646A CN 201310260264 A CN201310260264 A CN 201310260264A CN 103454517 A CN103454517 A CN 103454517A
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CN
China
Prior art keywords
capacitance type
transformer
type potential
potential transformer
voltage
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CN2013102602646A
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Chinese (zh)
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CN103454517B (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

The invention provides a method for online monitoring capacitive voltage transformers. The method includes the steps that secondary voltage data of the capacitive voltage transformers of transformer stations in a monitored area are acquired based on an energy management system; the secondary voltage data are associated with information of transformer equipment corresponding to the transformer stations; failure state information of the capacitive voltage transformers is judged according to the secondary voltage data; operating states of the capacitive voltage transformers of the transformer equipment of the transformer stations in the monitored area are monitored according to the failure state information. According to the method for online monitoring the capacitive voltage transformers, hardware equipment does not need to be additionally arranged, the operating states of the capacitive voltage transformers can be online monitored in real time, monitoring cost is low, safe and reliable operation of an electric power system is not affected, and the method is suitable for being widely popularized and applied to the electric power system.

Description

The capacitance type potential transformer on-line monitoring method
Technical field
The present invention relates to the electric power project engineering field, particularly relate to a kind of capacitance type potential transformer on-line monitoring method.
Background technology
Capacitance type potential transformer (Capacitor Voltage Transformer; CVT) be widely used in electric system; voltage supplied measurement, power observing and controlling, automatic control, relay protection the power equipment that doubles as the use of power line carrier electric capacity; because its impact strength is little, volume is little, lightweight; reliable damping ferroresonance and possess the advantage of good transient response characteristic again in actual applications; replacing gradually electromagnetic potential transformer, is a kind of requisite equipment in electrical network.
Capacitance type potential transformer, in operational process, may occur can blasting when serious because of equipment deficiencies such as internal wetted, the dielectric loss that aging and the internal capacitance component breakdown causes raise, secondary voltage is abnormal, causes serious consequence.Therefore, need to be monitored capacitance type potential transformer, can be grasped the running status of capacitance type potential transformer by monitoring, be found in time the capacitance type potential transformer fault, fix a breakdown early, thereby fault harm is dropped to minimum.
At present, electric system also exists some on-line monitoring systems for capacitance type potential transformer and method, but these methods be measure the electric current that flows through insulating medium under phase voltage be the basis, mainly by capacitance type potential transformer electric capacity and dielectric loss value are monitored, in conjunction with related algorithm, calculated, as imbalance compensation method, bridge method, zero passage relative method or digital waveform method etc., by input, calculate and obtain monitoring result.
Owing to need to take the capacitance type potential transformer electric capacity that is difficult to Measurement accuracy and dielectric loss value in the method, it is basis, need to have a power failure and carry out corresponding hardware modification while causing the accuracy of capacitance type potential transformer monitoring and sensitivity to can not get effective assurance and application, complicated construction technique, cost are high, and hardware modification can bring the problems such as difficult in maintenance, easily affect the security of operation of electric system, therefore, be difficult to wide popularization and application in electric system.
Summary of the invention
Based on this, be necessary high for cost in prior art, as 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, comprise the steps:
Obtain the secondary voltage data of the capacitance type potential transformer of each transformer station in monitored area based on energy management system;
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, the secondary voltage data of obtaining based on energy management system, the converting equipment information that the secondary voltage data are corresponding with each transformer station is carried out associated, and according to the fault status information of the secondary voltage data obtained judgement capacitance type potential transformer, thereby realize the running status of monitoring capacitance type potential transformer.Without increasing hardware device, realized that monitoring cost is low to the real time on-line monitoring of capacitance type potential transformer running status, and do not affected the operation of power system safety and stability, suitable in electric system wide popularization and application.
The accompanying drawing explanation
The capacitance type potential transformer on-line monitoring method process flow diagram that Fig. 1 is an embodiment.
Embodiment
Embodiment below in conjunction with accompanying drawing to capacitance type potential transformer on-line monitoring method of the present invention is described in detail.
Capacitance type potential transformer on-line monitoring method process flow diagram shown in Figure 1, that Fig. 1 is an embodiment, comprise the steps;
S1: the secondary voltage data of obtaining the capacitance type potential transformer of each transformer station in monitored area based on energy management system (EMS).
In one embodiment, the process that described step S1 obtains the secondary voltage data comprises the steps:
S101, utilize the signal transducer on the capacitance type potential transformer be installed on each transformer station in monitored area to be gathered secondary voltage.
The effect of signal transducer is that the capacitance type potential transformer secondary voltage data that scene is moved are gathered.Preferably, the precision of the signal transducer used can be 0.2 grade, the error that is measured value and actual value is less than 0.2%, it is 1% that the capacitance type potential transformer fault of setting due to energy management system detects precision, therefore adopts the precision of above-mentioned signal transducer can meet the requirement of energy management system.
S102, by energy management system periodic polls the signal transducer that gathers each transformer station, obtain the secondary voltage data and be kept in database.
This step is mainly that the signal to sensor is gathered and transmits, the data volume of obtaining by the periodic polls mode is more complete, the signals collecting time interval is the ms level, be to get a hundreds of data p.s., can meet thus the demand of energy management system to data volume, realize capacitance type potential transformer secondary voltage data Real-time Obtaining.
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, according to the capacitance type potential transformer of described wiring topological diagram, obtain converting equipment information corresponding to each transformer station from equipment account system.
S203, by the secondary voltage data of each capacitance type potential transformer, with described converting equipment information, carry out associated.
Owing to not having capacitance type potential transformer in the primary connection figure of energy management system, therefore, equipment that can the capacitance type potential transformer secondary voltage data of collection are concrete with it carries out associated.At first draw the capacitance type potential transformer primary connection topological diagram of all transformer stations in monitored area, then bonding apparatus account system realizes the associated of converting equipment that capacitance type potential transformer secondary voltage data in the database of energy management system are corresponding with it, obtains the capacitance type potential transformer topological diagram.
Associated by the capacitance type potential transformer secondary voltage data of setting up the wiring topological diagram between the converting equipment information corresponding with it, 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 access 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 judge that processing is to reach the purpose of fault distinguishing.
In one embodiment, the step of the fault status information of the described capacitance type potential transformer of judgement in step S3 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 (VT); Preferably, at first determine the type of testing capacitance formula voltage transformer (VT), then from described capacitance type potential transformer topological diagram, find the capacitance type potential transformer of the same type with described testing capacitance formula voltage transformer (VT).
The secondary voltage of the secondary voltage of described testing capacitance formula voltage transformer (VT) and described capacitance type potential transformer of the same type is compared.
If the secondary voltage voltage deviation value between this testing capacitance formula voltage transformer (VT) and capacitance type potential transformer of the same type all is greater than the setting threshold values, and this capacitance type potential transformer is greater than described setting threshold values with the secondary voltage deviate in setting-up time section before, judges that this capacitance type potential transformer is in malfunction.
Different demands due to Operation of Electric Systems, in transformer station, the mounting means of capacitance type potential transformer can there are differences, generally, all capacitance type potential transformer can be installed on the three-phase of transformer station's median generatrix, for the 500kV bus, on the three-phase of its each outlet, capacitance type potential transformer can be installed, and for 220kV and with Down Highway, usually only on single-phase, capacitance type potential transformer is installed in its outlet, therefore, for above-mentioned situation, the fault status information of judgement capacitance type potential transformer can comprise following two kinds of modes:
(1) obtain the secondary voltage data of single-phase capacitance type potential transformer of the same type in the outlet of substation bus bar; The secondary voltage of the secondary voltage of testing capacitance formula voltage transformer (VT) and capacitance type potential transformer of the same type is compared; In the setting-up time section, if the secondary voltage voltage deviation value on this capacitance type potential transformer and homophase between capacitance type potential transformer of the same type all is greater than the setting threshold values, and the secondary voltage deviate before this capacitance type potential transformer and self in the setting-up time section is greater than described setting threshold values, judges 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, the appearance formula voltage transformer (VT) that this capacitance type potential transformer secondary voltage and corresponding bus phase homophase powered on carries out voltage ratio, if its secondary voltage deviate surpasses the threshold values of setting, and the secondary voltage value of setting in the period before secondary voltage numerical value and self is compared, if its secondary voltage deviate also surpasses 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; The secondary voltage of the secondary voltage of testing capacitance formula voltage transformer (VT) and capacitance type potential transformer of the same type is compared; If the secondary voltage voltage deviation value between the capacitance type potential transformer on this capacitance type potential transformer and homophase all is greater than the setting threshold values, and the secondary voltage deviate before this capacitance type potential transformer and self in the setting-up time section is greater than described setting threshold values, judges that this capacitance type potential transformer is in malfunction.
For example, many capacitance type potential transformers are installed in 500kV substation bus bar and outlet, by in these capacitance type potential transformers, capacitance type potential transformer secondary voltage of the same type carries out in real time mutually relatively, if the secondary voltage deviate (voltage difference/secondary voltage value) of certain capacitance type potential transformer of certain type and other capacitance type potential transformer all surpasses the threshold values of setting within the time of setting, and the secondary voltage value of setting in the period before secondary voltage numerical value and self is compared, if its secondary voltage deviate also surpasses the threshold values of setting, judge that fault has occurred this capacitance type potential transformer.
In the present embodiment, requirement according to the capacitance type potential transformer operation, choose a secondary voltage deviate that can reflect the capacitance type potential transformer fault of each secondary voltage grade (for example 0.5%) as threshold values, by many capacitance type potential transformer secondary voltages in real time mutually relatively and the mode that relatively combines each other of the secondary voltage of separate unit capacitance type potential transformer secondary voltage different time sections differentiate the fault status information of capacitance type potential transformer.
S4: the running status of monitoring the capacitance type potential transformer of the converting equipment of each transformer station in described monitored area according to described fault status information.
In this step, record the running status of capacitance type potential transformer overall process, and differentiate by the fault status information of preceding step, Real-Time Monitoring is wanted the running status of the capacitance type potential transformer of the converting equipment of each transformer station in monitored area, for fault analysis and fault handling provide technical support.
Further, be directed to the malfunction that above-mentioned differentiation obtains, the capacitance type potential transformer of described generation fault is showed on the capacitance type potential transformer topological diagram.The capacitance type potential transformer that can show the converting equipment of each transformer station in monitored area by the capacitance type potential transformer topological diagram, and by modes such as pilot lamp or highlighted demonstrations, the capacitance type potential transformer of fault is displayed.
In addition, carry out corresponding alarm when having determined capacitance type potential transformer in malfunction, realize warning function fast.
The capacitance type potential transformer on-line monitoring method of above-described embodiment, utilize the hardware device of energy management system, the capacitance type potential transformer operation secondary voltage data of energy management system of take are basis, under the condition that does not increase monitoring hardware, capacitance type potential transformer to each transformer station in monitored area carries out real time on-line monitoring, fault signature amount using the secondary voltage data of capacitance type potential transformer as capacitance type potential transformer, and set up the fault judgment models, by the mode that many capacitance type potential transformer secondary voltages compare in real time mutually and separate unit capacitance type potential transformer secondary voltage different time data compare each other, the malfunction of judgement capacitance type potential transformer, safeguard simple, cost is low, avoid the impact on the safe and stable operation of electric system, accuracy and the sensitivity of on-line monitoring have been improved.
Technology of the present invention, the capacitance type potential transformer on-line monitoring based on the EMS data, can realize the running status of capacitance type potential transformer is carried out to real time on-line monitoring, finds timely and effectively the fault of capacitance type potential transformer, reduces loss.Can effectively understand by system the process that capacitance type potential transformer breaks down simultaneously, be conducive to analyze its culprit, be of great significance for the operational reliability tool that improves capacitance type potential transformer.
For example, a 500kV transformer station, a circuit of carrying the 1000MW load, when the C2 of this line capacitance formula voltage transformer (VT) punctures an element, Turn Ratio Changing 2.82%, one day 24h, to count less 3360*10*10*10 degree electricity, within one day, economic loss can reach 1,680,000 yuan.Visible, can do sth. in advance to find a fault in, just can lose less 1,680,000 yuan of electricity price losses, economic benefit is very huge, 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 the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (7)

1. a capacitance type potential transformer on-line monitoring method, is characterized in that, comprises the steps:
Obtain the secondary voltage data of the capacitance type potential transformer of each transformer station in monitored area based on energy management system;
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.
2. capacitance type potential transformer on-line monitoring method according to claim 1, is characterized in that, the step of the secondary voltage data of the described capacitance type potential transformer that obtains each transformer station in monitored area based on energy management system comprises:
The signal transducer that utilization is installed on the capacitance type potential transformer of each transformer station in monitored area is gathered secondary voltage;
Signal transducer by each transformer station of energy management system periodic polls also gathers voltage signal and obtains the 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 converting equipment information that described secondary voltage data are corresponding with each transformer station is carried out associated step and comprised:
Draw the wiring topological diagram of the capacitance type potential transformer of each transformer station in described monitored area;
Obtain converting equipment information corresponding to each transformer station according to the capacitance type potential transformer of described wiring topological diagram from equipment account system;
The secondary voltage data of each capacitance type potential transformer and described converting equipment information are carried out to associated acquisition capacitance type potential transformer topological diagram.
4. capacitance type potential transformer on-line monitoring method according to claim 3, is characterized in that, describedly according to described secondary voltage data, judges that the step of the fault status information of described capacitance type potential transformer comprises:
Obtain the secondary voltage data of the capacitance type potential transformer of transformer station;
Obtain the capacitance type potential transformer of the same type with testing capacitance formula voltage transformer (VT);
The secondary voltage of the secondary voltage of described testing capacitance formula voltage transformer (VT) and described capacitance type potential transformer of the same type is compared;
If the secondary voltage voltage deviation value between this testing capacitance formula voltage transformer (VT) and capacitance type potential transformer of the same type all is greater than the setting threshold values, and this capacitance type potential transformer is greater than described setting threshold values with the secondary voltage deviate in setting-up time section before, judges that this capacitance type potential transformer is in malfunction.
5. capacitance type potential transformer on-line monitoring method according to claim 3, is characterized in that, the described step of obtaining the capacitance type potential transformer of the same type with testing capacitance formula voltage transformer (VT) comprises:
Determine the type of testing capacitance formula voltage transformer (VT);
Find the capacitance type potential transformer of the same type with described testing capacitance formula voltage transformer (VT) from described capacitance type potential transformer topological diagram.
6. capacitance type potential transformer on-line monitoring method according to claim 3, is characterized in that, also comprises:
The capacitance type potential transformer of described generation fault is showed on described acquisition capacitance type potential transformer topological diagram.
7. capacitance type potential transformer on-line monitoring method according to claim 1, is characterized in that, also comprises:
Carry out corresponding alarm when having determined capacitance type potential transformer in malfunction.
CN201310260264.6A 2013-06-26 2013-06-26 Capacitance type potential transformer on-line monitoring method CN103454517B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104034977A (en) * 2014-05-29 2014-09-10 国家电网公司 Capacitive voltage transformer electrified detector
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
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
CN105548943A (en) * 2016-01-25 2016-05-04 中国南方电网有限责任公司超高压输电公司梧州局 CVT capacitor online monitoring method based on CVT secondary voltage monitoring
CN106646319A (en) * 2016-10-09 2017-05-10 国网江苏省电力公司电力科学研究院 Electronic voltage transformer anomaly identification method based on in-station joint measurement
CN107607764A (en) * 2017-05-17 2018-01-19 广东电网有限责任公司佛山供电局 A kind of multichannel capacitance type potential transformer real-time detection method and 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
RU2686522C2 (en) * 2014-06-13 2019-04-29 Фогаль Нанотек Method for real-time monitoring of operating conditions of capacitive sensor

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Cited By (11)

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Publication number Priority date Publication date Assignee Title
CN104034977A (en) * 2014-05-29 2014-09-10 国家电网公司 Capacitive voltage transformer electrified detector
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
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RU2686522C2 (en) * 2014-06-13 2019-04-29 Фогаль Нанотек Method for real-time monitoring of operating conditions of 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
CN105548943A (en) * 2016-01-25 2016-05-04 中国南方电网有限责任公司超高压输电公司梧州局 CVT capacitor online monitoring method based on CVT secondary voltage monitoring
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
CN106646319A (en) * 2016-10-09 2017-05-10 国网江苏省电力公司电力科学研究院 Electronic voltage transformer anomaly identification method based on in-station joint measurement
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
CN107607764A (en) * 2017-05-17 2018-01-19 广东电网有限责任公司佛山供电局 A kind of multichannel capacitance type potential transformer real-time detection method and 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

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Effective date of registration: 20210415

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Patentee after: FOSHAN POWER SUPPLY BUREAU, GUANGDONG POWER GRID Corp.

Address before: 528011 No.1 Fenjiang South Road, Chancheng District, Foshan City, Guangdong Province

Patentee before: FOSHAN POWER SUPPLY BUREAU, GUANGDONG POWER GRID Corp.

Patentee before: WUHAN BRANCH, CHINA ELECTRIC POWER Research Institute