CN103344821A - Transient overvoltage on-line monitoring system based on CVT and provided with built-in low-voltage capacitor - Google Patents

Transient overvoltage on-line monitoring system based on CVT and provided with built-in low-voltage capacitor Download PDF

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Publication number
CN103344821A
CN103344821A CN2013102558944A CN201310255894A CN103344821A CN 103344821 A CN103344821 A CN 103344821A CN 2013102558944 A CN2013102558944 A CN 2013102558944A CN 201310255894 A CN201310255894 A CN 201310255894A CN 103344821 A CN103344821 A CN 103344821A
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CN
China
Prior art keywords
transient
voltage
built
pressure sensor
partial pressure
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CN2013102558944A
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Chinese (zh)
Inventor
司文荣
金珩
傅晨钊
杨凌辉
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国家电网公司
上海市电力公司
华东电力试验研究院有限公司
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Priority to CN2013102558944A priority Critical patent/CN103344821A/en
Publication of CN103344821A publication Critical patent/CN103344821A/en

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Abstract

The invention relates to a transient overvoltage on-line monitoring system based on a CVT and provided with a built-in low-voltage capacitor. The transient overvoltage on-line monitoring system is connected with a power grid and comprises a partial pressure sensor, a protector, a transient voltage collector and an industrial personal computer. The partial pressure sensor is a capacitor voltage transformer provided with a built-in non-inductive capacitor. The partial pressure sensor is connected with a power transmission line or a bus. The partial pressure sensor monitors voltage disturbance of the power grid in real time; the magnitude of voltages of all phases is transmits to the transient voltage collector through the protector; the magnitude of voltages of all the phases when a transient overvoltage occurs and waveforms and parameters before and after a failure are collected and saved by the transient voltage collector, and the transient voltage collector transmits collected signals to the industrial personal computer. The industrial personal computer gives out an alarm according to the collected signals and displays monitoring results. Compared with the prior art, the transient overvoltage on-line monitoring system based on the CVT and provided with the built-in low-voltage capacitor has the advantages of being high in stability and monitoring accuracy and beneficial to the improvement of the operational stability of the power grid.

Description

Transient overvoltage on-line monitoring system based on the built-in low-voltage capacitance of CVT

Technical field

The present invention relates to a kind of electrical network on-line monitoring technique, especially relate to a kind of transient overvoltage on-line monitoring system based on the built-in low-voltage capacitance of CVT.

Background technology

The electrical network transient state process is the important sign of operation of power networks state, the East China is for measurement or the monitoring of supergrid transient state process at present, except between the Start-up and Adjustment before new equipment puts into operation, utilize external voltage divider or bottom shielding of bushing to carry out outside the provisional several times switching measurement, the monitoring that occurs transient state process for electrical network in actual motion does not also start to walk, and lacks effective and feasible means and measures or monitor.

Present stage, the working method of superpotential on-line monitoring voltage divider mainly contained following three kinds: 1) press signal from the power taking of PT secondary; 2) install special-purpose capacitive divider additional in bus or outlet and gather signal; 3) install low-voltage arm electric capacity additional at the end of operational outfit screen.Mode 1 is influenced by the PT transient performance, and its accuracy is relatively poor; 2 suitable low-voltage distribution networks of mode are such as system's over-voltage monitoring of 10kV and 35kV electric pressure; Mode 3 can satisfy the requirement that present engineering is used preferably by capacitance partial pressure, but because sensor is exposed to device external, relatively is fit to Start-up and Adjustment and uses, and removes when debugging finishes.

Summary of the invention

Purpose of the present invention is exactly to provide a kind of stability high for the defective that overcomes above-mentioned prior art existence, monitoring accuracy height, the transient overvoltage on-line monitoring system based on the built-in low-voltage capacitance of CVT of raising operation of power networks stability.

Purpose of the present invention can be achieved through the following technical solutions:

A kind of transient overvoltage on-line monitoring system based on the built-in low-voltage capacitance of CVT, be connected with electrical network, this on-line monitoring system comprises partial pressure sensor, protector, transient voltage collector and industrial computer, described partial pressure sensor is the capacitance type potential transformer that is built-in with noninductive electric capacity, and described partial pressure sensor is connected with transmission line of electricity or bus;

Partial pressure sensor is monitored the voltage disturbance of electrical network in real time; and by protector the amplitude of each phase voltage is transferred to the transient voltage collector; waveform and parameter when the transient overvoltage generation is gathered and preserved to the transient voltage collector before and after each phase voltage amplitude, the fault; and the signal of gathering is transferred to industrial computer, industrial computer sends according to the signal of gathering and reports to the police and show monitoring result.

Described partial pressure sensor is connected with protector by transmission cable, and described protector is connected with the transient voltage collector by communications optical cable, and described transient voltage collector is connected with industrial computer by telecommunication cable.

Described partial pressure sensor is capacitance type potential transformer, and piezoelectricity held C during this capacitance type potential transformer comprised 2, described middle piezoelectricity holds C 2Low pressure end be in series with noninductive capacitor C 3, described protector is connected noninductive capacitor C 3Two ends.

Described protector comprises Isolation protector or overvoltage protection device.

Described transient voltage collector comprises the transient voltage registering instrument.

Compared with prior art, the present invention is by holding C to piezoelectricity in the conventional 500kV capacitance type potential transformer (CVT) 2Low pressure end seals in noninductive big capacitor C 3Form the output of transient overvoltage coupling dividing potential drop, transient overvoltage to electrical network carries out on-line monitoring, set up the stable dividing potential drop mode that a kind of suitable supergrid over-voltage waveform is measured, monitoring is real-time and monitoring accuracy is high, has improved the stability of operation of power networks state.

Description of drawings

Fig. 1 is structural representation of the present invention;

Fig. 2 is the structural representation of partial pressure sensor of the present invention.

Embodiment

The present invention is described in detail below in conjunction with the drawings and specific embodiments.Present embodiment is that prerequisite is implemented with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.

As shown in Figure 1; a kind of transient overvoltage on-line monitoring system based on the built-in low-voltage capacitance of CVT; be connected with electrical network 1 (transmission line of electricity or bus); this on-line monitoring system comprises partial pressure sensor 2; protector 4; transient voltage collector 6 and industrial computer 8; described partial pressure sensor 2 is for being built-in with the capacitance type potential transformer of noninductive electric capacity (low-voltage capacitance); described partial pressure sensor 2 is connected with transmission line of electricity or bus 1; described partial pressure sensor 2 is connected with protector 4 by transmission cable 3; described protector 4 is connected with transient voltage collector 6 by communications optical cable 5, and described transient voltage collector 6 is connected with industrial computer 8 by telecommunication cable 7.Described protector comprises Isolation protector or overvoltage protection device.Described transient voltage collector comprises the transient voltage registering instrument.

Partial pressure sensor 2 is the voltage disturbance of monitoring electrical network in real time; and by protector 4 amplitude of each phase voltage is transferred to transient voltage collector 6; waveform and parameter when the transient overvoltage generation is gathered and preserved to transient voltage collector 6 before and after each phase voltage amplitude, the fault; and the signal of gathering is transferred to industrial computer 8, industrial computer 8 sends according to the signal of gathering and reports to the police and show monitoring result.

Described transient voltage registering instrument comprises A/D converter and storer, and described A/D converter is connected with storer, protector, industrial computer respectively.

As Fig. 1-shown in Figure 2, described partial pressure sensor is capacitance type potential transformer, and this capacitance type potential transformer comprises high-voltage capacitance C 1, middle piezoelectricity holds C 2, described middle piezoelectricity holds C 2Low pressure end be in series with noninductive capacitor C 3, described protector is connected noninductive capacitor C 3Two ends.This capacitance type potential transformer and the capacitance type potential transformer structural similarity with carrier wave annex just replace drainage coil with the transient overvoltage monitoring means, it is in parallel with discharging gap to have added the ground connection plug-in strip simultaneously.

The present invention is based on the built-in low-voltage capacitance C3 coupling of 500kVCVT transient overvoltage on-line monitoring system and succeed in developing, be installed on 5438 lines of 500kV bottle transmutation power station, East China stable operation at present.

The built-in low-voltage capacitance C of CVT that the present invention adopts 3Transient overvoltage coupling dividing potential drop mode can be used for the transformation of 110kV and above electric pressure CVT, and is used for the transient overvoltage monitoring.

The industrial computer that the present invention uses can adopt notebook computer etc. to substitute.

Claims (5)

1. transient overvoltage on-line monitoring system based on the built-in low-voltage capacitance of CVT, be connected with electrical network, it is characterized in that, this on-line monitoring system comprises partial pressure sensor, protector, transient voltage collector and industrial computer, described partial pressure sensor is the capacitance type potential transformer that is built-in with noninductive electric capacity, and described partial pressure sensor is connected with transmission line of electricity or bus;
Partial pressure sensor is monitored the voltage disturbance of electrical network in real time; and by protector the amplitude of each phase voltage is transferred to the transient voltage collector; waveform and parameter when the transient overvoltage generation is gathered and preserved to the transient voltage collector before and after each phase voltage amplitude, the fault; and the signal of gathering is transferred to industrial computer, industrial computer sends according to the signal of gathering and reports to the police and show monitoring result.
2. a kind of transient overvoltage on-line monitoring system based on the built-in low-voltage capacitance of CVT according to claim 1; it is characterized in that; described partial pressure sensor is connected with protector by transmission cable; described protector is connected with the transient voltage collector by communications optical cable, and described transient voltage collector is connected with industrial computer by telecommunication cable.
3. a kind of transient overvoltage on-line monitoring system based on the built-in low-voltage capacitance of CVT according to claim 1 is characterized in that described partial pressure sensor is capacitance type potential transformer, and piezoelectricity held C during this capacitance type potential transformer comprised 2, described middle piezoelectricity holds C 2Low pressure end be in series with noninductive capacitor C 3, described protector is connected noninductive capacitor C 3Two ends.
4. a kind of transient overvoltage on-line monitoring system based on the built-in low-voltage capacitance of CVT according to claim 1 is characterized in that described protector comprises Isolation protector or overvoltage protection device.
5. a kind of transient overvoltage on-line monitoring system based on the built-in low-voltage capacitance of CVT according to claim 1 is characterized in that described transient voltage collector comprises the transient voltage registering instrument.
CN2013102558944A 2013-06-25 2013-06-25 Transient overvoltage on-line monitoring system based on CVT and provided with built-in low-voltage capacitor CN103344821A (en)

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CN2013102558944A CN103344821A (en) 2013-06-25 2013-06-25 Transient overvoltage on-line monitoring system based on CVT and provided with built-in low-voltage capacitor

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103499730A (en) * 2013-10-16 2014-01-08 国网山东省电力公司青岛供电公司 Safety electricity testing and discharging device
CN105467192A (en) * 2015-12-21 2016-04-06 云南电网有限责任公司电力科学研究院 Method for measuring converter station potential rising on earth
CN105717352A (en) * 2016-02-04 2016-06-29 中国南方电网有限责任公司超高压输电公司贵阳局 Voltage detection unit of capacitor tower capacitance
CN106249022A (en) * 2016-07-08 2016-12-21 国网上海市电力公司 The analysis system and method that DC control and protection system is affected by exchange transient voltage
CN106597148A (en) * 2016-11-24 2017-04-26 云南电网有限责任公司电力科学研究院 Residual voltage monitoring based state monitoring system and method for lightning arrester without serial gap
CN104267252B (en) * 2014-10-13 2017-07-04 西安交通大学 A kind of decoupling method of use capacitance sensor measuring transformer coil transient voltage
WO2018006876A1 (en) * 2016-07-08 2018-01-11 国网上海市电力公司 Capacitive voltage mutual inductor for transient over-voltage monitoring system
CN110161292A (en) * 2019-04-30 2019-08-23 云南电网有限责任公司电力科学研究院 A kind of distribution line ground fault voltage signal acquisition device

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CN1584607A (en) * 2004-05-31 2005-02-23 席世友 Overvoltage on-line sampler for 6-35 KV electric power system
CN1737597A (en) * 2005-04-30 2006-02-22 重庆大学 Power distribution network over-voltage on-line monitoring device and method thereof
CN201302591Y (en) * 2008-10-20 2009-09-02 华北电力大学(保定) Over-voltage online monitoring device
CN102545151A (en) * 2010-12-22 2012-07-04 上海市电力公司 On-line monitoring system for capacitor voltage transformer
CN102737828A (en) * 2011-04-13 2012-10-17 华东电力试验研究院有限公司 Capacitor voltage transformer provided with transient overvoltage monitoring unit
CN202614831U (en) * 2012-03-20 2012-12-19 上海市电力公司 Transient overvoltage on-line monitoring system

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Publication number Priority date Publication date Assignee Title
JP2000236623A (en) * 1999-02-15 2000-08-29 Sanyo Electric Co Ltd Overvoltage-detecting device
CN1584607A (en) * 2004-05-31 2005-02-23 席世友 Overvoltage on-line sampler for 6-35 KV electric power system
CN1737597A (en) * 2005-04-30 2006-02-22 重庆大学 Power distribution network over-voltage on-line monitoring device and method thereof
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CN102545151A (en) * 2010-12-22 2012-07-04 上海市电力公司 On-line monitoring system for capacitor voltage transformer
CN102737828A (en) * 2011-04-13 2012-10-17 华东电力试验研究院有限公司 Capacitor voltage transformer provided with transient overvoltage monitoring unit
CN202614831U (en) * 2012-03-20 2012-12-19 上海市电力公司 Transient overvoltage on-line monitoring system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103499730A (en) * 2013-10-16 2014-01-08 国网山东省电力公司青岛供电公司 Safety electricity testing and discharging device
CN104267252B (en) * 2014-10-13 2017-07-04 西安交通大学 A kind of decoupling method of use capacitance sensor measuring transformer coil transient voltage
CN105467192A (en) * 2015-12-21 2016-04-06 云南电网有限责任公司电力科学研究院 Method for measuring converter station potential rising on earth
CN105467192B (en) * 2015-12-21 2018-05-04 云南电网有限责任公司电力科学研究院 A kind of method for measuring current conversion station ground potential and rising
CN105717352A (en) * 2016-02-04 2016-06-29 中国南方电网有限责任公司超高压输电公司贵阳局 Voltage detection unit of capacitor tower capacitance
CN106249022A (en) * 2016-07-08 2016-12-21 国网上海市电力公司 The analysis system and method that DC control and protection system is affected by exchange transient voltage
WO2018006876A1 (en) * 2016-07-08 2018-01-11 国网上海市电力公司 Capacitive voltage mutual inductor for transient over-voltage monitoring system
JP2018532249A (en) * 2016-07-08 2018-11-01 国网上海市電力公司 Capacitor-type instrument transformer for transient overvoltage monitoring system
CN106249022B (en) * 2016-07-08 2018-11-27 国网上海市电力公司 The analysis system and method that exchange transient voltage influences DC control and protection system
CN106597148A (en) * 2016-11-24 2017-04-26 云南电网有限责任公司电力科学研究院 Residual voltage monitoring based state monitoring system and method for lightning arrester without serial gap
CN110161292A (en) * 2019-04-30 2019-08-23 云南电网有限责任公司电力科学研究院 A kind of distribution line ground fault voltage signal acquisition device

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