CN102129763A - CVT (Capacitor Voltage Transformer) online monitoring system - Google Patents

CVT (Capacitor Voltage Transformer) online monitoring system Download PDF

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Publication number
CN102129763A
CN102129763A CN 201110003819 CN201110003819A CN102129763A CN 102129763 A CN102129763 A CN 102129763A CN 201110003819 CN201110003819 CN 201110003819 CN 201110003819 A CN201110003819 A CN 201110003819A CN 102129763 A CN102129763 A CN 102129763A
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CN
China
Prior art keywords
cvt
line monitoring
monitoring
output terminal
unit
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Pending
Application number
CN 201110003819
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Chinese (zh)
Inventor
王玮
徐丽杰
李永超
赵殿全
孟庆丰
彭晓洁
韩冬
谢蓓敏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NORTHEAST CHINA GRID Co Ltd CHANGCHUN EHV BUREAU
Beijing Jiaotong University
Original Assignee
NORTHEAST CHINA GRID Co Ltd CHANGCHUN EHV BUREAU
Beijing Jiaotong University
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Publication date
Application filed by NORTHEAST CHINA GRID Co Ltd CHANGCHUN EHV BUREAU, Beijing Jiaotong University filed Critical NORTHEAST CHINA GRID Co Ltd CHANGCHUN EHV BUREAU
Priority to CN 201110003819 priority Critical patent/CN102129763A/en
Publication of CN102129763A publication Critical patent/CN102129763A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a CVT (Capacitor Voltage Transformer) online monitoring system. The system comprises a data acquisition terminal, a 2.4GHz wireless network and a monitoring mainframe, wherein the monitoring mainframe is connected with the data acquisition terminal through the 2.4GHz wireless network. The CVT online monitoring system has the following advantages of being capable of acquiring various kinds of information (such as end shield current, dielectric loss and the like) of 500kV CVT equipment, being capable of accurately monitoring the change of running state of the CVT equipment in real time and discovering safety accidents, such as insulation faults and the like of the CVT equipment in time, being capable of transmitting monitored data through the 2.4GHz wireless network, and having strong anti-interference and less detection error.

Description

The CVT on-line monitoring system
Technical field
The present invention relates to the high voltage capacitive maintenance of electric device, relate in particular to a kind of CVT on-line monitoring system.
Background technology
High voltage capacitive electrical equipment such as bushing, high-voltage capacitance formula voltage transformer (VT), high-tension current inductor, manifold type capacitor etc. are the important component parts of transformer station.Existing maintenance work is to carry out preventive trial, inspection.It has played certain effect to the reliability that improves equipment in early days, but has that proof cycle is long, labour intensity is big, validity is poor, influences problem such as power supply reliability.For the operation conditions of grasping electric system high voltage capacitive electrical equipment mainly adopts wired concentrated mode, by telecommunication cable the data that are monitored to are delivered to same live testing instrument and compare at present, calculate relative phase difference, relative dielectric loss value etc.Because on-the-spot 500kV CVT (capacitance type potential transformer) equipment is a lot, and be distributed in different positions, so just need with long telecommunication cable, make that the connection of telecommunication cable is very inconvenient, and simulating signal has decay to a certain degree and can't avoid various electromagnetic interference (EMI) in the scene, is difficult to realize the measurement of a plurality of 500kV CVT equipment operation parameters simultaneously.Therefore can not in time find the potential safety hazard that 500kV CVT equipment exists, lead to great security incident easily.
Summary of the invention
In order to overcome the deficiency of above-mentioned prior art problem, the invention provides a kind of CVT (capacitance type potential transformer) on-line monitoring system, this system can gather the multiple information of CVT equipment in real time, realizes the CVT equipment on-line monitoring, and strong interference immunity, to detect error little.
A kind of CVT on-line monitoring system of the present invention comprises: data collection station, wireless network and monitoring main frame; Described monitoring main frame is connected with described data collection station by described wireless network.
Above-mentioned CVT on-line monitoring system, preferred described CVT on-line monitoring system is the 500kVCVT on-line monitoring system, described wireless network is the wireless network of 2.4GHz.
Above-mentioned CVT on-line monitoring system, preferred described acquisition terminal comprises current sensor, voltage sensor, signal condition unit, A/D converting unit, processor unit and wireless communication module; Wherein, the output terminal of described current sensor all is connected with the input end of described signal condition unit with the output terminal of described voltage sensor, and the output terminal of described signal condition unit, described A/D converting unit, described processor unit and wireless communication module are linked in sequence.
Above-mentioned CVT on-line monitoring system, preferred described current sensor are single-turn type punching sensor.
Above-mentioned CVT on-line monitoring system, preferred described signal condition unit comprises filtering circuit and amplifying circuit, the input end of described filtering circuit all is connected with the output terminal of described current sensor and the output terminal of described voltage sensor, the output terminal of described filtering circuit is connected with the input end of described amplifying circuit, and the output terminal of described amplifying circuit is connected with described A/D converting unit.
Above-mentioned CVT on-line monitoring system, preferred described processor unit is the DSP digital signal processor.
Above-mentioned CVT on-line monitoring system, preferred described wireless communication module is the zigbee wireless communication module.
In terms of existing technologies, the present invention has following advantage:
The first, no electric connection between measuring equipment and the tested CVT, signals collecting and wireless communication module are integrated into data collection station, have avoided simulating signal to be subjected to the influence of the interference of electromagnetic field in transmission course, have improved the degree of accuracy of data acquisition.
The second, adopt the 2.4GHz wireless network, solved the communication issue between data acquisition unit and the monitoring main frame well, and be not subjected to the electromagnetic interference (EMI) of transformer station, broken away from the constraint of telecommunication cable, reduce construction and maintenance greatly, and can obtain the various parameters of tested CVT exactly.
Three, the sensor reliability height of Cai Yonging, stable performance, precision height, life-span are long, thereby have improved stability, reliability and the accuracy of data collection station.
Four, by wireless network data collection station and monitoring main frame are connected, data collection station and the right independence of monitoring having property of main frame, the increase-volume that therefore helps system enlarges.The present invention is particularly useful for the on-line monitoring of 500kVCVT.
Description of drawings
Fig. 1 is a CVT on-line monitoring system example structure synoptic diagram of the present invention;
Fig. 2 is the electrical schematic diagram of the data collection station of CVT on-line monitoring system of the present invention;
Fig. 3 is the electrical schematic diagram of the signal condition unit of CVT on-line monitoring system of the present invention;
Among the figure: the 101-data collection station, the 102-2.4GHz wireless network, 103-monitors main frame, 201-current sensor, 202-voltage sensor, 203-signal condition unit, 204-A/D converting unit, 205-processor unit, 206-wireless communication module.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Introduce a preferred embodiment of the present invention below in conjunction with Fig. 1 to Fig. 3.
With reference to Fig. 1, Fig. 1 is a CVT on-line monitoring system example structure synoptic diagram of the present invention.As shown in Figure 1, this CVT on-line monitoring system is the 500kVCVT on-line monitoring system, comprises a plurality of data collection stations 101,2.4GHz wireless network 102 and monitoring main frame 103.Monitoring main frame 103 is connected with data collection station 101 by 2.4GHz wireless network 102, with control data acquisition terminal 101, finishes reading of data, and then realizes the calculating of equivalent capacitance, end screen electric current and the dielectric dissipation factor of tested 500kVCVT equipment; And can compare with historical data, also have warning function, exceed the interval of setting in data after, can the warning reminding user make a response, thereby realize on-line monitoring.
With reference to Fig. 2, Fig. 2 is among the embodiment shown in Figure 1, the electrical schematic diagram of data collection station.As shown in Figure 2, in the present embodiment, data collection station 101 comprises current sensor 201, voltage sensor 202, signal condition unit 203, A/D converting unit 204, processor unit 205 and wireless communication module 206.Current sensor 201 is connected the input end of signal condition unit 203 with the simulating signal that voltage sensor 202 collects, the output terminal of signal condition unit 203 connects the input end of A/D converting unit 204, the input end of the output terminal connection processing device unit 205 of A/D converting unit 204, the output terminal of processor unit 205 connects the input end of wireless communication module 206.
Among this embodiment, current sensor 201 does not have direct the connection for high-precision single-turn type punching sensor with CVT, and is safe and reliable.Voltage sensor 202 is high-precision sensor, measures the voltage signal of CVT secondary side.
With reference to Fig. 3, Fig. 3 is the electrical schematic diagram of signal condition unit in the foregoing description.As shown in Figure 3, signal condition unit 203 comprises filtering circuit 301 and amplifying circuit 302.Current sensor 201 is connected the input end of signal condition unit 203 with the simulating signal that voltage sensor 202 collects, it is the input end of filtering circuit 301, the output terminal of filtering circuit 301 connects the input end of amplifying circuit 302, the output terminal of amplifying circuit 302, promptly the output terminal of signal condition unit 203 connects the input end of A/D converting unit 204.The 203 pairs of simulating signals that collect in signal condition unit are nursed one's health, and avoid occurring phase shift, guarantee the authenticity of signal.
A/D converting unit 204 can be carried out digital-to-analog conversion, and this unit is subject to processing the control of device unit 205.Processor unit 205 can adopt the DSP digital signal processor, the collection of control data and wireless communication module 206.Wireless communication module 206 is zigbee wireless communication modules.The zigbee wireless communication module adopts leading at present, most widely used new generation of wireless radio frequency chip, is to aim to be operated in the low-consumption wireless communication module that 2.4GHz ISM/SRD exempts to apply for the frequency range design.
The foregoing description can be gathered the multiple information of 500kV CVT equipment in real time, as: end screen electric current, dielectric loss etc., can monitor the variation of 500kV CVT equipment running status accurately and timely, in time find security incidents such as the apparatus insulated fault of 500kV CVT, and can export Monitoring Data accurately, reliably, strong interference immunity, to detect error little.
More than a kind of CVT on-line monitoring system provided by the present invention is described in detail, used specific embodiment herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, part in specific embodiments and applications all can change.In sum, this description should not be construed as limitation of the present invention.

Claims (7)

1. a CVT on-line monitoring system is characterized in that, comprising:
Data collection station, wireless network and monitoring main frame; Described monitoring main frame is connected with described data collection station by described wireless network.
2. CVT on-line monitoring system according to claim 1 is characterized in that,
Described CVT on-line monitoring system is a 500kV CVT on-line monitoring system, and described wireless network is the wireless network of 2.4GHz.
3. CVT on-line monitoring system according to claim 2 is characterized in that,
Described acquisition terminal comprises current sensor, voltage sensor, signal condition unit, A/D converting unit, processor unit and wireless communication module;
Wherein, the output terminal of described current sensor all is connected with the input end of described signal condition unit with the output terminal of described voltage sensor, and the output terminal of described signal condition unit, described A/D converting unit, described processor unit and wireless communication module are linked in sequence.
4. CVT on-line monitoring system according to claim 3 is characterized in that, described current sensor is a single-turn type punching sensor.
5. CVT on-line monitoring system according to claim 4 is characterized in that,
Described signal condition unit comprises filtering circuit and amplifying circuit, the input end of described filtering circuit all is connected with the output terminal of described current sensor and the output terminal of described voltage sensor, the output terminal of described filtering circuit is connected with the input end of described amplifying circuit, and the output terminal of described amplifying circuit is connected with described A/D converting unit.
6. CVT on-line monitoring system according to claim 5 is characterized in that, described processor unit is the DSP digital signal processor.
7. CVT on-line monitoring system according to claim 6 is characterized in that, described wireless communication module is the zigbee wireless communication module.
CN 201110003819 2011-01-10 2011-01-10 CVT (Capacitor Voltage Transformer) online monitoring system Pending CN102129763A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103487640A (en) * 2013-09-22 2014-01-01 浙江大学 Current monitoring method for enterprise electric equipment based on distributed type network
CN104374426A (en) * 2014-11-07 2015-02-25 国网上海市电力公司 Low-cost easily-installed power line working state real-time monitoring point and system
CN105005246A (en) * 2015-08-12 2015-10-28 恒信大友(北京)科技有限公司 Portable data acquisition terminal
CN105005245A (en) * 2015-08-12 2015-10-28 恒信大友(北京)科技有限公司 Data processing method
CN105225450A (en) * 2014-07-28 2016-01-06 桂林市广泽科技开发有限公司 A kind of operation interval environmental parameter intelligent radio monitoring processing system
CN107359879A (en) * 2017-07-06 2017-11-17 江苏东华测试技术股份有限公司 A kind of system and method for reducing on-line monitoring mass data storage
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
CN109324225A (en) * 2018-11-15 2019-02-12 国网山东省电力公司电力科学研究院 A kind of high-precision current sampling system for CVT on-line monitoring

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CN201138365Y (en) * 2007-11-15 2008-10-22 杭州大有科技发展有限公司 CVT on-line monitoring terminal
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CN201138365Y (en) * 2007-11-15 2008-10-22 杭州大有科技发展有限公司 CVT on-line monitoring terminal
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103487640A (en) * 2013-09-22 2014-01-01 浙江大学 Current monitoring method for enterprise electric equipment based on distributed type network
CN105225450A (en) * 2014-07-28 2016-01-06 桂林市广泽科技开发有限公司 A kind of operation interval environmental parameter intelligent radio monitoring processing system
CN104374426A (en) * 2014-11-07 2015-02-25 国网上海市电力公司 Low-cost easily-installed power line working state real-time monitoring point and system
CN105005246A (en) * 2015-08-12 2015-10-28 恒信大友(北京)科技有限公司 Portable data acquisition terminal
CN105005245A (en) * 2015-08-12 2015-10-28 恒信大友(北京)科技有限公司 Data processing method
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
CN107359879A (en) * 2017-07-06 2017-11-17 江苏东华测试技术股份有限公司 A kind of system and method for reducing on-line monitoring mass data storage
CN109324225A (en) * 2018-11-15 2019-02-12 国网山东省电力公司电力科学研究院 A kind of high-precision current sampling system for CVT on-line monitoring

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