WO2013139131A1 - Dispositif d'amplification utilisé pour un système de surveillance en ligne de condensateur de décharge partielle - Google Patents

Dispositif d'amplification utilisé pour un système de surveillance en ligne de condensateur de décharge partielle Download PDF

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Publication number
WO2013139131A1
WO2013139131A1 PCT/CN2012/084302 CN2012084302W WO2013139131A1 WO 2013139131 A1 WO2013139131 A1 WO 2013139131A1 CN 2012084302 W CN2012084302 W CN 2012084302W WO 2013139131 A1 WO2013139131 A1 WO 2013139131A1
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WO
WIPO (PCT)
Prior art keywords
capacitor
pin
resistor
grounded
operational amplifier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/084302
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English (en)
Chinese (zh)
Inventor
周行星
司文荣
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.)
State Grid Shanghai Electric Power Co Ltd
East China Power Test and Research Institute Co Ltd
State Grid Corp of China SGCC
Original Assignee
State Grid Shanghai Electric Power Co Ltd
East China Power Test and Research Institute Co Ltd
State Grid Corp of China SGCC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Shanghai Electric Power Co Ltd, East China Power Test and Research Institute Co Ltd, State Grid Corp of China SGCC filed Critical State Grid Shanghai Electric Power Co Ltd
Publication of WO2013139131A1 publication Critical patent/WO2013139131A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/64—Testing of capacitors

Definitions

  • the utility model relates to an amplifier in the electric field, in particular to an amplifying device for an on-line monitoring system for partial discharge of a capacitor.
  • the capacitance is large, so that the sensitivity is low when the pulse current method is used for detection, and the amplitude of the discharge pulse propagated to the current sensor is small, so that it needs to be amplified.
  • Research on amplifiers involved in on-line monitoring systems for partial discharge of capacitors has drawn attention.
  • the application number is: 201110193173.6, and the filing date is: July 12, 2011, the invention is entitled "On-line Monitoring System for Capacitors Based on Partial Discharge Monitoring", which discloses a system comprising several sensors, amplifiers And a signal processing unit, an AD conversion unit, a control processing and a display unit.
  • the RF amplifier involved performs pulse broadening and logarithmic amplification on the received RF sensing signal and outputs it to the front-end signal processing unit.
  • the super-amplifier amplifies and outputs the received ultrasonic sensing signal 100 times or 1000 times. But often the following problems exist:
  • the impedance of the amplifier is susceptible to the impedance of the sensor
  • the object of the present invention is to provide an amplifying apparatus for a capacitor local discharge on-line monitoring system capable of eliminating the influence of the impedance of the amplifier on the impedance of the sensor and the influence of the deflection on the signal transmission in order to overcome the drawbacks of the prior art described above.
  • An amplifying device for a capacitor partial discharge online monitoring system wherein the capacitor partial discharge online monitoring system comprises a current sensor and a signal collecting device, wherein the amplification device is The voltage follower unit, the amplifying unit and the cable driving unit are connected, the input end of the voltage following unit is connected to the current sensor, the input end of the amplifying unit is connected to the voltage following unit, and the output end is connected to the cable driving unit, the cable The drive unit is connected to the signal acquisition device.
  • the voltage following unit includes a first operational amplifier including an 8-pin, a first resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a fifth capacitor;
  • the second pin of the first operational amplifier is connected to the sixth pin through a first resistor, the third pin is connected to the current sensor, the fourth pin is connected to the bias negative voltage, and the first capacitor is connected in parallel with the second capacitor. Grounded, the other end is connected to the fourth pin, the fifth pin is grounded via the third capacitor, the seventh pin is connected to the positive bias voltage, the fourth capacitor and the fifth capacitor are connected in parallel, one end is grounded, and the other end is connected On the seventh pin.
  • the amplifying unit includes a second operational amplifier including an 8-pin, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, and a ninth capacitor;
  • the third pin of the second operational amplifier is connected to the sixth pin of the first operational amplifier, and is grounded through the fifth resistor, the fourth pin is connected to the bias negative voltage, and the sixth capacitor is connected in parallel with the seventh capacitor Grounded, the other end is connected to the fourth pin, the fifth pin is grounded, and the sixth pin is grounded through the third resistor and the second resistor in sequence, and is grounded via the fourth resistor, and the seventh pin is connected to the positive bias.
  • the voltage, the parallel connection of the eighth capacitor and the ninth capacitor is grounded, the other end is connected to the seventh pin, and the second pin is connected between the second resistor and the third resistor.
  • the cable driving unit includes a third operational amplifier including an 8-pin, a sixth resistor, a seventh resistor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, and a fourteenth capacitor;
  • the second pin of the third operational amplifier is connected to the sixth pin through a sixth resistor, the third pin is connected to the sixth pin of the second operational amplifier, and the fourth pin is connected to the bias negative voltage, the tenth capacitor In parallel with the eleventh capacitor, one end is grounded, the other end is connected to the fourth pin, the fifth pin is grounded via the twelfth capacitor, and the sixth pin is connected to the signal acquisition device via the seventh resistor, and the seventh pin is connected positively.
  • the bias voltage, the thirteenth capacitor and the fourteenth capacitor are connected in parallel, one end is grounded, and the other end is connected to the seventh pin.
  • the cable drive unit can eliminate the impedance of different media in the transmission channel, which can eliminate The effect of catadiops on signal transmission.
  • FIG. 1 is a schematic view of the structure of the present invention. detailed description
  • an amplifying device for a capacitor partial discharge online monitoring system includes a current sensor IV and a signal collecting device VIII, including a voltage following unit I, an amplifying unit II and a cable driving unit III
  • the input end of the voltage following unit I is connected to the current sensor IV
  • the input end of the amplifying unit II is connected to the voltage following unit I
  • the output end is connected to the cable driving unit in
  • the cable driving unit m is connected to the signal collecting device ⁇ .
  • the voltage following unit 1 includes an AD829 first operational amplifier V including an 8-pin, a first resistor R1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5, the first operation
  • the second pin 102 of the amplifier V is connected to the sixth pin 106 through the first resistor C1
  • the third pin 103 is connected to the current sensor IV
  • the fourth pin 104 is connected to the bias negative voltage VS2
  • the first capacitor C1 is connected
  • the parallel circuit of the two capacitors C2 is grounded
  • the fifth pin 105 is grounded via the third capacitor C3, the seventh pin 107 is connected to the positive bias voltage VS1, and the parallel circuit connecting the fourth capacitor C4 and the fifth capacitor C5 is grounded.
  • the amplifying unit II includes an AD829 second operational amplifier VI including an 8-pin, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, and a third capacitor C3.
  • the fourth capacitor C4 and the fifth capacitor C5, the second pin 202 of the second operational amplifier VI is connected to the sixth pin 206 of the second operational amplifier through the second resistor R2, and the third pin 203 of the second operational amplifier is connected.
  • the sixth pin 206 of the first operational amplifier is grounded through the fifth resistor R5, the fourth pin 204 of the second operational amplifier is connected to the bias negative voltage VS2, and the parallel circuit connecting the sixth capacitor C6 and the seventh capacitor C7
  • the fifth pin 205 of the second operational amplifier is grounded, and the sixth pin 206 of the second operational amplifier is grounded via a series circuit of the third resistor R3 and the second resistor R2, and grounded via the fourth resistor R4,
  • the seventh pin 207 of the second operational amplifier is connected to the positive bias voltage VS1, and is connected to the parallel circuit of the eighth capacitor C8 and the ninth capacitor C9 to be grounded.
  • the cable driving unit includes an AD829 third operational amplifier VII, a sixth resistor R6, a seventh resistor R7, a tenth capacitor C10, a first capacitor C11, a twelfth capacitor C12, and a thirteenth capacitor C13, which are 8-pin.
  • the fourth capacitor C14, the second pin 302 of the third operational amplifier is connected to the sixth pin 306 of the third operational amplifier through the sixth resistor R6, and the third pin 303 of the third operational amplifier is connected to the second operational amplifier
  • the six-pin 306, the fourth pin 304 of the third operational amplifier is connected to the bias negative voltage VS2, and is connected to the parallel circuit of the tenth capacitor C10 and the eleventh capacitor C11 to be grounded, and the fifth pin 305 of the third operational amplifier
  • the fourth pin 306 of the third operational amplifier is connected to the signal acquisition device VIII via the seventh resistor C12, and the seventh pin 307 of the third operational amplifier is connected to the positive bias voltage VS1 and connected to the tenth.
  • the parallel circuit of the three capacitor C13 and the fourteenth capacitor C14 is grounded.
  • the function of the voltage follower unit I is to operatively connect the current sensor IV to the amplifying unit II.
  • the external capacitor and the external resistor of the current sensor IV and the II amplifying unit can be regarded as two two-port networks respectively.
  • the connection of the two two-port networks must meet certain conditions to not affect the respective performance. That is, the ratio of the input resistance of the latter stage network to the input impedance of the previous stage network is infinite, so the voltage follower unit I is designed here to connect the two networks.
  • the voltage follower unit I composed of the operational amplifier can be used to amplify the current of the amplifying unit II.
  • the effect of the sensor IV impedance is eliminated.
  • the op amp in the design uses AD829 chip, the input resistance can reach 10 ⁇ ⁇ in the same input, the output resistance is only 15 ⁇ , and the maximum bandwidth of the chip is 120MHz.
  • Amplifier Unit II also uses AD829 as an operational amplifier, using active amplification, its gain resistance is 105 ⁇ , feedback resistance is 2 ⁇ ⁇ , and the amplification factor is 20 times amplification. Under this condition, the amplifier 3DB bandwidth is 55MHz, and the bandwidth of the current sensor is basically the same. Co-ordination.
  • the frequency of the partial discharge signal detected by the system ranges from tens of kHz to several tens of MHz.
  • the cable drive unit has an input impedance of tens of ⁇ ⁇ and an output impedance of tens of ⁇ .
  • the impedance of the rear-end transmission cable is 50 ⁇ , so the output impedance of the cable drive unit III is 50 ⁇ .

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

L'invention concerne un dispositif d'amplification utilisé pour un système de surveillance en ligne de condensateur de décharge partielle. Le système de surveillance en ligne de condensateur de décharge partielle comprend un capteur de courant (IV) et un dispositif d'acquisition de signaux (VIII). Le dispositif d'amplification comprend une unité de suiveur de tension (I), une unité d'amplification (II), et une unité d'entraînement de câble (III). Une extrémité d'entrée de l'unité de suiveur de tension (I) est connectée au capteur de courant (IV), une extrémité d'entrée de l'unité d'amplification (II) est reliée à l'unité de suiveur de tension (I), une extrémité de sortie est reliée à l'unité d'entraînement du câble (III), et l'unité d'entraînement du câble (III) est connectée au dispositif d'acquisition de signaux (VIII). Par rapport à l'art antérieur, le dispositif d'amplification présente les avantages d'éliminer l'influence de l'impédance d'amplificateur sur l'impédance de capteur, et l'influence de réfraction et de réflexion sur une transmission de signal.
PCT/CN2012/084302 2012-03-20 2012-11-08 Dispositif d'amplification utilisé pour un système de surveillance en ligne de condensateur de décharge partielle Ceased WO2013139131A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2012201074210U CN202502197U (zh) 2012-03-20 2012-03-20 一种用于电容器局部放电在线监测系统的放大装置
CN201220107421.0 2012-03-20

Publications (1)

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WO2013139131A1 true WO2013139131A1 (fr) 2013-09-26

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CN (1) CN202502197U (fr)
WO (1) WO2013139131A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9753080B2 (en) 2014-12-09 2017-09-05 Rosemount Inc. Partial discharge detection system
US10794736B2 (en) 2018-03-15 2020-10-06 Rosemount Inc. Elimination of floating potential when mounting wireless sensors to insulated conductors
US10833531B2 (en) 2018-10-02 2020-11-10 Rosemount Inc. Electric power generation or distribution asset monitoring
US11067639B2 (en) 2017-11-03 2021-07-20 Rosemount Inc. Trending functions for predicting the health of electric power assets
US11181570B2 (en) 2018-06-15 2021-11-23 Rosemount Inc. Partial discharge synthesizer
US11313895B2 (en) 2019-09-24 2022-04-26 Rosemount Inc. Antenna connectivity with shielded twisted pair cable
US11448682B2 (en) 2017-03-02 2022-09-20 Rosemount Inc. Trending functions for partial discharge

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202502197U (zh) * 2012-03-20 2012-10-24 上海市电力公司 一种用于电容器局部放电在线监测系统的放大装置
CN105954568A (zh) * 2016-07-01 2016-09-21 河北箱变电器有限公司 一种对局部放电及温度监测装置监测的二次设备
CN109471178B (zh) * 2018-11-02 2020-10-27 江苏省地震局 一种地电场传感器系统及其电极埋设方法
CN115729300A (zh) * 2022-11-21 2023-03-03 深圳市量子慧智科技有限公司 信号调节电路、生命监测装置和电子设备

Citations (5)

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EP0488719A2 (fr) * 1990-11-30 1992-06-03 Kabushiki Kaisha Toshiba Système et méthode pour détecter des décharges partielles d'interrupteurs à gaz
CN101261297A (zh) * 2008-04-17 2008-09-10 沈阳工业大学 电力变压器绕组参数在线实时辨识装置及方法
CN201145723Y (zh) * 2008-01-15 2008-11-05 河北省电力研究院 便携式电气设备局部放电超声探测器
CN102353881A (zh) * 2011-07-12 2012-02-15 江苏镇安电力设备有限公司 基于局部放电监测的电容器在线监测系统
CN202502197U (zh) * 2012-03-20 2012-10-24 上海市电力公司 一种用于电容器局部放电在线监测系统的放大装置

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EP0488719A2 (fr) * 1990-11-30 1992-06-03 Kabushiki Kaisha Toshiba Système et méthode pour détecter des décharges partielles d'interrupteurs à gaz
CN201145723Y (zh) * 2008-01-15 2008-11-05 河北省电力研究院 便携式电气设备局部放电超声探测器
CN101261297A (zh) * 2008-04-17 2008-09-10 沈阳工业大学 电力变压器绕组参数在线实时辨识装置及方法
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CN202502197U (zh) * 2012-03-20 2012-10-24 上海市电力公司 一种用于电容器局部放电在线监测系统的放大装置

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ZHANG, SHUXIAN: "Study on the Oriented Coupling System of On-Line Monitoring Partial Discharge in 1# Transformer of Qijiang Power Station and Analyzing the Result of Application", CHINESE MASTER'S THESES FULL-TEXT DATABASE ENGINEERING SCIENCE AND TECHNOLOGYD, no. 1, 15 January 2007 (2007-01-15) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9753080B2 (en) 2014-12-09 2017-09-05 Rosemount Inc. Partial discharge detection system
US11448682B2 (en) 2017-03-02 2022-09-20 Rosemount Inc. Trending functions for partial discharge
US11067639B2 (en) 2017-11-03 2021-07-20 Rosemount Inc. Trending functions for predicting the health of electric power assets
US10794736B2 (en) 2018-03-15 2020-10-06 Rosemount Inc. Elimination of floating potential when mounting wireless sensors to insulated conductors
US11181570B2 (en) 2018-06-15 2021-11-23 Rosemount Inc. Partial discharge synthesizer
US10833531B2 (en) 2018-10-02 2020-11-10 Rosemount Inc. Electric power generation or distribution asset monitoring
US11313895B2 (en) 2019-09-24 2022-04-26 Rosemount Inc. Antenna connectivity with shielded twisted pair cable

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