WO2015117304A1 - System for online monitoring of zinc oxide arrester and method thereof - Google Patents

System for online monitoring of zinc oxide arrester and method thereof Download PDF

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Publication number
WO2015117304A1
WO2015117304A1 PCT/CN2014/086188 CN2014086188W WO2015117304A1 WO 2015117304 A1 WO2015117304 A1 WO 2015117304A1 CN 2014086188 W CN2014086188 W CN 2014086188W WO 2015117304 A1 WO2015117304 A1 WO 2015117304A1
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arrester
online monitoring
phase
module
current
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PCT/CN2014/086188
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French (fr)
Chinese (zh)
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李云龙
杨小铭
王煜
宋凯
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国电南瑞科技股份有限公司
国电南瑞南京控制系统有限公司
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Publication of WO2015117304A1 publication Critical patent/WO2015117304A1/en

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    • 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
    • G01R31/1236—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 of surge arresters
    • 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
    • G01R31/52—Testing for short-circuits, leakage current or ground faults

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  • the invention relates to the field of zinc oxide lightning arrester monitoring, and particularly relates to a zinc oxide lightning arrester online monitoring system and a method thereof.
  • Zinc oxide arrester is the most widely used arrester. It utilizes the good nonlinear volt-ampere characteristics of zinc oxide to make the current flowing through the arrester at normal working voltage very small, reaching milliampere or even microampere level; when lightning strike occurs When the voltage is over-voltage, the resistance of the zinc oxide arrester to the ground drops sharply, and the over-voltage energy is released, effectively preventing the power equipment from being hit by lightning shock waves.
  • online monitoring technology and online monitoring device have also been developed.
  • One of the most widely used devices for monitoring leakage current and number of lightning strikes is an electromechanical instrument consisting of an electromagnetic DC mA meter and a counter.
  • the advantage of this kind of device is that the leakage current is intuitive to display, but the accuracy is general, and the inspection personnel need to check regularly, and it is not convenient to find the problem in time.
  • Another type of device that starts to be applied is a current transformer type monitoring instrument, which has the function of remote transmission of monitoring information, but the general measurement accuracy is low, and only the full current of the arrester leakage can be monitored, the resistive current cannot be calculated, and the operation state of the arrester cannot be performed.
  • the present invention aims to provide an on-line monitoring system for zinc oxide surge arresters which is practical, safe, reliable and easy to install, and realizes real-time monitoring of the insulation condition of high-voltage electrical equipment. Accidents occur, the maintenance interval is extended, the number and time of power outages are reduced, and the equipment utilization rate and overall economic benefits are improved.
  • An online monitoring system for zinc oxide arrester and method thereof characterized in that it comprises:
  • the lightning arrester leakage current online monitoring unit is used to collect the leakage current and the mains information of the arrester of the phase, and calculate the fundamental phase of the leakage current of the phase Phase with the mains fundamental , calculate the phase difference between the two ;
  • the bus voltage online monitoring unit is synchronized with the arrester leakage current online monitoring unit, and is used for collecting the phase voltage and the mains voltage of the phase of the busbar where the arrester is located, and obtaining the phase bus voltage base by the dynamic vector compensation DFT algorithm of the microprocessor analysis and calculation unit.
  • Wave phase Phase with the mains fundamental calculate the phase difference between the two ;
  • the lightning arrester online monitoring main control unit is responsible for commanding the lightning arrester leakage current online monitoring unit and the bus voltage online monitoring unit, comprehensively comparing calculation and data remote transmission, and reading the lightning arrester leakage current and the reference phase of the bus voltage of the arrester through the communication bus. Calculate the formula based on judgment Obtaining a resistive current of the phase;
  • the lightning arrester leakage current online monitoring unit and the bus voltage online monitoring unit are both in communication with the lightning arrester online monitoring main control unit.
  • the lightning arrester online monitoring unit includes: an arrester current collecting component for collecting lightning arrester leakage current and mains information of the phase, and a first data processing and analyzing component for calculating the collected data, for calculating the leakage current
  • an arrester current collecting component for collecting lightning arrester leakage current and mains information of the phase
  • a first data processing and analyzing component for calculating the collected data, for calculating the leakage current
  • the phase difference between the fundamental phase and the fundamental phase of the mains is phased; the arrester current collecting component is coupled to the first data processing analysis component.
  • the arrester current collecting component includes a lightning arrester leakage current collecting module for collecting a lightning arrester leakage current, a lightning strike overvoltage current collecting module for overvoltage during a lightning strike, and a first for collecting a commercial current as a reference power source.
  • the reference power collection module; the lightning arrester leakage current collecting module, the lightning overvoltage current collecting module, and the first reference power collecting module are all connected with the microprocessor analyzing and calculating unit, and the first reference power collecting module passes the current converting unit Connect to the mains.
  • the bus voltage online monitoring unit includes a bus voltage collecting component and a second data processing analyzing component for collecting a lightning arrester leakage voltage
  • the bus voltage collecting component includes a phase voltage collecting module for collecting the bus phase voltage and using
  • the second reference power supply collecting module is configured to collect the mains voltage as the reference power source, and the phase voltage collecting module and the second reference power collecting module are both connected to the second data processing and analyzing component.
  • first data processing analysis component and the second data processing analysis component each include a microprocessor analysis calculation unit and a current conversion unit, and the first reference power collection module and the second reference power collection module respectively pass current conversion
  • the unit is connected to the mains, and the microprocessor analysis and calculation unit comprises a signal conditioning module, an analog-to-digital conversion module, a microprocessor analysis calculation module and a control communication module, and the signal conditioning module is connected at one end to the microprocessor through the analog-to-digital conversion module.
  • An analysis calculation module the microprocessor analysis calculation module is further connected with a multiplexer, and the multiplexer is connected to the signal conditioning module through a multi-channel feedback resistor, and can automatically select a magnification factor according to the measured current magnitude to ensure the modulus Conversion The device always works in the optimal conversion range to realize high-precision measurement.
  • the control communication module is connected to the microprocessor analysis calculation module, and communicates with the lightning protection device on-line monitoring main control unit through the control communication module.
  • the lightning strike current collecting module adopts a large-range passive zero-flux through-heart type transformer
  • the arrester leakage current collecting module the phase voltage collecting module and the reference power collecting module all adopt high-precision active zero-flux through-heart
  • the transformer, the microprocessor analysis and calculation module uses a high speed digital signal processor.
  • the analog to digital conversion module uses a 16-bit high precision AD converter.
  • An online monitoring method for a zinc oxide surge arrester using the above detection system is characterized in that: the lightning arrester on-line monitoring main control unit sends a synchronous acquisition command, and the lightning arrester current collecting component of the lightning arrester online monitoring unit and the bus voltage online
  • the bus voltage collection component of the monitoring unit simultaneously performs analog quantity acquisition, and then each of the collected analog quantities is subjected to relatively independent filtering, amplification processing and AD conversion, and then the digital quantity is sent to the microprocessor of the respective microprocessor analysis and calculation unit.
  • the analysis and calculation module, the respective microprocessor analysis and calculation unit through a series of independent analysis and calculation of the dynamic vector compensation DFT algorithm, the phase difference between the phase leakage current and the mains is obtained.
  • the lightning arrester online monitoring main control unit reads the reference phase of the arrester leakage current and the bus voltage of the arrester through the communication bus, and obtains the resistive current Ir of the phase by judging and comparing.
  • the lightning arrester leakage current online monitoring unit and the bus voltage online monitoring unit both use the commercial power as the reference source collection module, and respectively use the phase of the commercial power as the phase reference of the lightning arrester leakage current and the bus voltage of the arrester. .
  • the lightning arrester on-line monitoring unit determines the amplification factor according to the fluctuation range of the actual leakage current value of the arrester and the optimal conversion range of the analog-to-digital converter, and then selects a feedback resistor of a suitable resistance value.
  • the analog signal output by the arrester leakage current collecting module of the arrester current collecting component is first filtered, primary amplified, and signal-followed, and then converted into digital quantity, and output to the microprocessor analysis and calculation unit, according to the data collected by the collecting unit for the first time. Calculating the magnitude of the leakage current value, and the microprocessor analysis calculation unit determines, according to the magnitude of the value, whether the feedback resistance of the access circuit needs to be adjusted;
  • the feedback resistor of the access circuit is reselected by controlling the multiplexer, and the analog signal is filtered, accurately amplified, and the signal is followed to enter AD to be converted into the final digital quantity, and output to the microprocessor analysis and calculation unit. analysis caculate.
  • the communication control module uses 485 and CAN dual bus communication configuration, of which 485 communication chip type No. SN75LBC184; CAN communication chip model: TJA1040.
  • the invention realizes the real-time monitoring of the leaking full current, the resistive current, the capacitive current, the number of lightning strikes and the lightning strike time of the arrester by the above system and the method thereof, and can automatically adjust the amplification factor according to the magnitude of the measured current to achieve high precision measuring.
  • harmonic compensation method synchronous measurement, relative comparison, combined with on-site working conditions, the monitored data is analyzed and processed, which can be protected from environmental temperature and humidity and timely discover the porcelain sleeve caused by contamination or internal moisture. Problems such as leakage current or increased leakage current of the insulating rod can effectively avoid accidents.
  • the invention can be installed electrically, and can be conveniently and quickly connected to the system.
  • Figure 1 is a schematic diagram of on-site monitoring of the lightning arrester online monitoring system.
  • FIG. 2 is a flow chart of calculating the resistive current of the arrester by the lightning arrester online monitoring system.
  • Figure 3 is a schematic diagram of the principle of automatically adjusting the magnification of the lightning arrester online monitoring system.
  • the present embodiment is an online monitoring system for a zinc oxide surge arrester.
  • the system is realized by an on-line monitoring main control unit of the arrester, an on-line monitoring unit for the leakage current of the arrester, and an on-line monitoring unit for the bus voltage.
  • the lightning arrester online monitoring main control unit is responsible for issuing commands, comprehensive comparison calculation and data remote transmission;
  • the lightning arrester leakage current online monitoring unit is composed of the arrester current collecting component and the first data processing and analysis component;
  • the bus voltage online monitoring unit is composed of the bus voltage collecting component.
  • the second data processing and analysis component is composed, the bus voltage collecting component is composed of a phase voltage collecting module and a reference power collecting module.
  • the data processing and analysis component of the lightning arrester leakage current online monitoring unit and the bus voltage online monitoring unit are unified and designed into two parts: a microprocessor analysis calculation unit and a current conversion unit.
  • the microprocessor analysis and calculation unit includes a signal conditioning module, a 16-bit high-precision AD conversion module, an analysis calculation module, and a control communication module.
  • One end of the signal conditioning module is connected to the microprocessor analysis and calculation module through the analog-to-digital conversion module, and the microprocessor analysis calculation module is further connected with a multi-way selector, and the multi-way selector is connected to the signal conditioning module through multiple feedback resistors, according to The measured current size automatically selects the amplification factor to ensure that the analog-to-digital converter always works in the optimal conversion range, thereby achieving high-precision measurement.
  • the control communication module is connected to the microprocessor analysis calculation module, and communicates with the lightning protection device on-line monitoring main control unit by controlling the communication module.
  • the bus voltage online monitoring unit includes a bus voltage collecting component and a second data processing analyzing component for collecting the lightning arrester leakage voltage, and the bus voltage collecting component is divided into three parts including a phase voltage collecting module for collecting the bus phase voltage and using
  • the second reference power supply collecting module is configured to collect the mains voltage as the reference power source, and the phase voltage collecting module and the second reference power collecting module are both connected to the second data processing and analyzing component.
  • the first reference power collection module and the second reference power collection module are respectively connected to the commercial power through a current conversion unit, and the microprocessor analysis calculation unit includes a signal conditioning module, an analog-to-digital conversion module, a microprocessor analysis calculation module, and a control communication module. .
  • the lightning strike current collecting module of the embodiment adopts a large-range passive zero-flux through-heart type transformer, and the model is: GP-103, which can effectively identify the lightning strike action according to the lightning strike current. .
  • Other current collecting modules, lightning arrester leakage current collecting module, phase voltage collecting module and reference power collecting module all adopt high-precision active zero-flux through-heart transformer, model: ALS50-10A/7.07V.
  • the communication control module adopts 485 and CAN dual bus communication configuration, wherein the 485 communication chip model is SN75LBC184; the CAN communication chip model is: TJA1040.
  • 1 is the A-phase busbar arrester online monitoring unit
  • 2 is the B-phase busbar arrester online monitoring unit
  • 3 is the C-phase busbar arrester online monitoring unit.
  • 5 is a current transformer for collecting the leakage current of the arrester
  • 6 is a current transformer for collecting the lightning strike current of the arrester
  • 7 is a current transformer for collecting the reference voltage.
  • the current transformers at the corresponding positions in the B-phase busbar arrester online monitoring unit 2 and the C-phase busbar arrester online monitoring unit 3 are identical to those in the above-mentioned A-phase busbar arrester online monitoring unit 1, and are not described.
  • 4 is the bus voltage online monitoring unit.
  • 8 is a current transformer that collects a reference voltage.
  • 9 10 and 11 are current transformers for collecting the A-phase bus voltage, the B-phase bus voltage, and the C-phase bus voltage, respectively.
  • the arrester grounding terminal screen cable needs to pass through the arrester leakage current in the online monitoring unit 1 to collect the leakage current of the current transformer 5 and the current transformer 6 that collects the lightning current, and then access the earth.
  • the leakage current of the arrester can be collected in a normal state, and the lightning current can be collected at the time of lightning strike, thereby identifying the lightning strike action.
  • the L terminal of the mains needs to pass through the current conversion unit and then passes through the current transformer 7 that collects the reference voltage and then returns to the N terminal.
  • the output signals of the current transformers 5, 6, and 7 are transmitted to the microprocessor analysis and calculation unit for filtering, amplification, AD conversion, and analysis and calculation.
  • the three-phase voltages of A, B, and C are drawn from the busbar voltage transformer terminal box through the busbar.
  • the current conversion unit of the voltage online monitoring unit passes through the current transformers 9, 10 and 11 that collect the A-phase bus voltage, the B-phase bus voltage, and the C-phase bus voltage, respectively, the ground is connected.
  • the L terminal of the mains needs to pass through the current conversion unit and then pass through the current transformer 8 that collects the reference voltage and then returns to the N terminal.
  • the output signals of the current transformers 8, 9, 10 and 11 are transmitted to the microprocessor analysis and calculation unit for filtering, amplification, AD conversion and analysis and calculation.
  • the lightning arrester online monitoring main control unit, the lightning arrester online monitoring unit and the bus voltage online monitoring unit use the CAN bus communication preferentially, and the 485 bus communication can also be selected if the requirement is met.
  • the results of the final monitoring of the system such as leakage of full current, resistive circuit, capacitive current, phase angle difference, number of lightning strikes and lightning strike time, are sent to the background control room by the online monitoring unit of the arrester according to the actual required specification format. Complete a complete arrester status monitoring process.
  • the arrester current collecting component of the arrester leakage current online monitoring unit and the bus voltage collecting module of the bus voltage online monitoring unit simultaneously perform analog quantity acquisition, and then respectively
  • the digital quantity is sent to the analysis and calculation module of the respective microprocessor analysis and calculation unit, and the two units pass the dynamic vector compensation DFT algorithm. Series independent analysis and calculation, the phase difference between the phase leakage current and the mains is obtained.
  • the lightning arrester online monitoring main control unit reads the leakage current of the arrester and the reference phase of the bus voltage of the arrester through the communication bus, and obtains the resistive current Ir of the phase through comprehensive analysis and comparison.
  • the amplification factor is determined, and then a feedback resistor of a suitable resistance is selected.
  • the multiplexer is controlled by the microprocessor analysis and calculation unit to control the breaking of a certain path. By default, one feedback resistor with the smallest amplification factor is selected.
  • the analog signal output by the lightning arrester leakage current acquisition module is first filtered, primary amplified and signal-followed, then converted into digital quantity, output to the microprocessor analysis and calculation unit, and the leakage current value is calculated for the first time according to the data collected by the acquisition unit.
  • the processor analysis calculation unit determines whether the access circuit feedback resistance needs to be adjusted according to the magnitude of the value. When adjustment is needed, the feedback resistor of the access circuit is reselected by controlling the multiplexer. After the analog signal is filtered, accurately amplified, and the signal is followed, the AD is converted into the final digital quantity, and the output is sent to the microprocessor analysis and calculation unit for analysis. Calculation.
  • the invention calculates the phase difference between the leakage current of the arrester and the bus voltage of the arrester.
  • the on-line monitoring unit of the arrester leakage current and the online monitoring unit of the bus voltage are all based on the mains Refer to the acquisition object of the power acquisition module, and use the phase of the mains as the phase reference for the leakage current of the arrester and the bus voltage of the arrester.
  • the relative comparison method is used to calculate the phase difference between the leakage current of the arrester and the bus voltage of the arrester, and the resistive current is easily calculated. Implementation steps include:
  • the lightning monitoring device online monitoring main control unit sends a synchronous acquisition instruction to the arrester leakage current online monitoring unit and the bus voltage online monitoring unit;
  • Lightning arrester leakage current online monitoring unit collects the lightning arrester leakage current and mains information of the phase, and obtains the phase leakage current fundamental phase by the dynamic vector compensation DFT algorithm of the microprocessor analysis and calculation unit. Phase with the mains fundamental , calculate the phase difference between the two ;
  • the bus voltage online monitoring unit synchronously collects the phase voltage and the mains voltage of the phase of the busbar where the arrester is located, and obtains the fundamental frequency of the phase bus voltage by the dynamic vector compensation DFT algorithm of the microprocessor analysis and calculation unit. Phase with the mains fundamental , calculate the phase difference between the two ;
  • the lightning arrester online monitoring main control unit reads the above two phase differences through the communication bus, and then can be based on The resistive current of the phase is calculated.
  • the lightning arrester leakage current online monitoring unit in the lightning arrester online monitoring system has the innovation that the amplification factor can be automatically selected according to the measured current to ensure that the analog-to-digital converter always works in the optimal conversion range, thereby achieving high-precision measurement.
  • the implementation method is:
  • the microprocessor automatically selects different paths to adjust the feedback resistance value, and then adjusts the amplification factor.
  • the output of the amplifier is adjusted to the optimal conversion range of the analog-to-digital converter for analog-to-digital conversion, enabling high-accuracy measurements.
  • the invention provides an online monitoring system for lightning arresters with scientific design, strong practicability, safety and reliability and convenient installation.
  • the online monitoring system of the arrester according to the present invention can realize real-time monitoring of the insulation condition of the high-voltage electrical equipment by real-time online monitoring of the full current, resistive current, capacitive current, lightning strike number and lightning strike timing of the arrester; Analyze the monitoring data to discover the potential failure of the metal zinc oxide arrester and provide an important data basis for the state maintenance, which provides a strong and reliable guarantee for the safe, reliable, stable and economic operation of the power system, and provides reliable operation and maintenance personnel.
  • Equipment insulation information and scientific maintenance basis so as to reduce accidents and extend the maintenance room Separate, reduce the number and time of power outages, improve equipment utilization and overall economic benefits.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

A system for online monitoring of a zinc oxide arrester comprises an arrester online monitoring master control unit, arrester leakage current online monitoring units (1, 2, 3) and a busbar voltage online monitoring unit (4). The arrester leakage current online monitoring units (1, 2, 3) consist of an arrester current acquisition assembly and a first data processing and analyzing assembly; and the busbar voltage online monitoring unit (4) consists of a busbar voltage acquisition assembly and a second data processing and analyzing assembly. The system realizes a real-time monitoring of the total leakage current, resistive current, capacitive current and the number and time of lightning strokes of the arrester, and can automatically adjust the amplification factor according to the magnitude of a measured current to realize a highly precise measurement and analyze and process the monitored data on the basis of field working conditions; the system is free from the influence of environmental temperature and humidity, and is capable of timely pinpointing such problems in the arrester like the leakage current of an insulator or an insulating rod increases due to dirtiness or dampening inside the arrester, so that accidents are effectively prevented from occurring.

Description

一种氧化锌避雷器在线监测系统及其方法Online monitoring system for zinc oxide arrester and method thereof 技术领域Technical field
本发明涉及的是氧化锌避雷器监测领域，具体涉及的是一种氧化锌避雷器在线监测系统及其方法。The invention relates to the field of zinc oxide lightning arrester monitoring, and particularly relates to a zinc oxide lightning arrester online monitoring system and a method thereof.
背景技术Background technique
氧化锌避雷器是目前应用最为广泛的一种避雷器，利用氧化锌良好的非线性伏安特性，使正常工作电压时流过避雷器的电流很小，达到毫安级甚至微安级；当雷击发生时，即过电压作用时，氧化锌避雷器对地电阻急剧下降，泄放掉过电压能量，有效避免电力设备遭遇雷电冲击波袭击。为了能实时了解氧化锌避雷器的运行状况，相应的在线监测技术和在线监测装置也发展起来。目前监测泄漏电流和雷击次数的应用最广泛的一类装置是由电磁式直流毫安表和计数器构成的电子机械式仪表。这种装置优点是泄漏电流显示直观，但准确度一般，而且需要巡检人员定时查看，运行出问题不便于及时发现。另一类开始应用的装置是电流互感器式监测仪表，具有监测信息远传功能，但普遍测量精度低，且仅能监测避雷器泄露的全电流，无法计算阻性电流，无法对避雷器运行状况进行全面的分析和判断。Zinc oxide arrester is the most widely used arrester. It utilizes the good nonlinear volt-ampere characteristics of zinc oxide to make the current flowing through the arrester at normal working voltage very small, reaching milliampere or even microampere level; when lightning strike occurs When the voltage is over-voltage, the resistance of the zinc oxide arrester to the ground drops sharply, and the over-voltage energy is released, effectively preventing the power equipment from being hit by lightning shock waves. In order to understand the operation status of the zinc oxide surge arrester in real time, corresponding online monitoring technology and online monitoring device have also been developed. One of the most widely used devices for monitoring leakage current and number of lightning strikes is an electromechanical instrument consisting of an electromagnetic DC mA meter and a counter. The advantage of this kind of device is that the leakage current is intuitive to display, but the accuracy is general, and the inspection personnel need to check regularly, and it is not convenient to find the problem in time. Another type of device that starts to be applied is a current transformer type monitoring instrument, which has the function of remote transmission of monitoring information, but the general measurement accuracy is low, and only the full current of the arrester leakage can be monitored, the resistive current cannot be calculated, and the operation state of the arrester cannot be performed. Comprehensive analysis and judgment.
发明内容Summary of the invention
针对现有氧化锌避雷器在线监测装置的不足，本发明目的是在于提供一种实用性强、安全可靠和安装便捷的氧化锌避雷器在线监测系统，实现对高压电气设备的绝缘状况进行实时监测达到减少事故发生，延长检修间隔，减少停电检修次数和时间，提高设备利用率和整体经济效益的目的。In view of the deficiencies of the existing on-line monitoring device for zinc oxide surge arresters, the present invention aims to provide an on-line monitoring system for zinc oxide surge arresters which is practical, safe, reliable and easy to install, and realizes real-time monitoring of the insulation condition of high-voltage electrical equipment. Accidents occur, the maintenance interval is extended, the number and time of power outages are reduced, and the equipment utilization rate and overall economic benefits are improved.
为了实现上述目的，本发明是通过如下的技术方案来实现：In order to achieve the above object, the present invention is achieved by the following technical solutions:
一种氧化锌避雷器在线监测系统及其方法，其特征在于，其包括：An online monitoring system for zinc oxide arrester and method thereof, characterized in that it comprises:
避雷器泄漏电流在线监测单元，用于采集所在相的避雷器泄露电流和市电的信息，并计算得到该相泄露电流基波相位
Figure PCTCN2014086188-appb-000001
与市电基波相位
Figure PCTCN2014086188-appb-000002
，计算两者相位差
Figure PCTCN2014086188-appb-000003
；The lightning arrester leakage current online monitoring unit is used to collect the leakage current and the mains information of the arrester of the phase, and calculate the fundamental phase of the leakage current of the phase
Figure PCTCN2014086188-appb-000001
Phase with the mains fundamental
Figure PCTCN2014086188-appb-000002
, calculate the phase difference between the two
Figure PCTCN2014086188-appb-000003
;
母线电压在线监测单元，与避雷器泄漏电流在线监测单元同步，用于采集 避雷器所在母线所在相的相电压和市电电压，经微处理器分析计算单元的动态向量补偿DFT算法得到该相母线电压基波相位
Figure PCTCN2014086188-appb-000004
与市电基波相位
Figure PCTCN2014086188-appb-000005
，计算两者相位差
Figure PCTCN2014086188-appb-000006
；The bus voltage online monitoring unit is synchronized with the arrester leakage current online monitoring unit, and is used for collecting the phase voltage and the mains voltage of the phase of the busbar where the arrester is located, and obtaining the phase bus voltage base by the dynamic vector compensation DFT algorithm of the microprocessor analysis and calculation unit. Wave phase
Figure PCTCN2014086188-appb-000004
Phase with the mains fundamental
Figure PCTCN2014086188-appb-000005
, calculate the phase difference between the two
Figure PCTCN2014086188-appb-000006
;
避雷器在线监测主控单元，用于负责命令避雷器泄漏电流在线监测单元和母线电压在线监测单元，综合比较计算和数据远传，并通过通信总线读取避雷器泄露电流与避雷器所在母线电压的参考相位，根据判断比较计算公式
Figure PCTCN2014086188-appb-000007
得到该相的阻性电流；The lightning arrester online monitoring main control unit is responsible for commanding the lightning arrester leakage current online monitoring unit and the bus voltage online monitoring unit, comprehensively comparing calculation and data remote transmission, and reading the lightning arrester leakage current and the reference phase of the bus voltage of the arrester through the communication bus. Calculate the formula based on judgment
Figure PCTCN2014086188-appb-000007
Obtaining a resistive current of the phase;
所述避雷器泄漏电流在线监测单元和母线电压在线监测单元均与避雷器在线监测主控单元相通讯。The lightning arrester leakage current online monitoring unit and the bus voltage online monitoring unit are both in communication with the lightning arrester online monitoring main control unit.
进一步的，所述避雷器在线监测单元包括：用于采集所在相的避雷器泄露电流和市电的信息的避雷器电流采集组件和用于对采集数据计算的第一数据处理分析组件，用于计算泄露电流基波相位与市电基波相位的两者相位差；所述避雷器电流采集组件与第一数据处理分析组件相连接。Further, the lightning arrester online monitoring unit includes: an arrester current collecting component for collecting lightning arrester leakage current and mains information of the phase, and a first data processing and analyzing component for calculating the collected data, for calculating the leakage current The phase difference between the fundamental phase and the fundamental phase of the mains is phased; the arrester current collecting component is coupled to the first data processing analysis component.
进一步的，所述避雷器电流采集组件包括用于采集避雷器泄露电流的避雷器泄露电流采集模块、用于雷击过程中过电压的雷击过压电流采集模块和用于采集市电电流作为参考电源的第一参考电源采集模块；所述避雷器泄露电流采集模块、雷击过压电流采集模块、第一参考电源采集模块均与微处理器分析计算单元相连接，所述第一参考电源采集模块均通过电流转换单元连接市电。Further, the arrester current collecting component includes a lightning arrester leakage current collecting module for collecting a lightning arrester leakage current, a lightning strike overvoltage current collecting module for overvoltage during a lightning strike, and a first for collecting a commercial current as a reference power source. The reference power collection module; the lightning arrester leakage current collecting module, the lightning overvoltage current collecting module, and the first reference power collecting module are all connected with the microprocessor analyzing and calculating unit, and the first reference power collecting module passes the current converting unit Connect to the mains.
进一步，所述母线电压在线监测单元包括用于采集避雷器泄露电压的母线电压采集组件和第二数据处理分析组件，所述母线电压采集组件包括用于对母线相电压采集的相电压采集模块和用采集市电电压作为参考电源的第二参考电源采集模块，所述相电压采集模块和第二参考电源采集模块均与第二数据处理分析组件相连接。Further, the bus voltage online monitoring unit includes a bus voltage collecting component and a second data processing analyzing component for collecting a lightning arrester leakage voltage, and the bus voltage collecting component includes a phase voltage collecting module for collecting the bus phase voltage and using The second reference power supply collecting module is configured to collect the mains voltage as the reference power source, and the phase voltage collecting module and the second reference power collecting module are both connected to the second data processing and analyzing component.
进一步的，所述第一数据处理分析组件和第二数据处理分析组件均包括微处理器分析计算单元和电流转换单元，所述第一参考电源采集模块和第二参考电源采集模块分别通过电流转换单元连接市电，所述微处理器分析计算单元包括信号调理模块、模数转换模块、微处理器分析计算模块和控制通信模块，所述信号调理模块一端连接通过模数转换模块连接微处理器分析计算模块，所述微处理器分析计算模块还连接有多路选择器，所述多路选择器通过多路反馈电阻连接信号调理模块，能根据被测电流大小自动选择放大倍数，保证模数转换 器始终工作于最优转换范围，进而实现高精度测量，所述控制通信模块连接微处理器分析计算模块，通过控制通信模块与避雷器在线监测主控单元相通讯。Further, the first data processing analysis component and the second data processing analysis component each include a microprocessor analysis calculation unit and a current conversion unit, and the first reference power collection module and the second reference power collection module respectively pass current conversion The unit is connected to the mains, and the microprocessor analysis and calculation unit comprises a signal conditioning module, an analog-to-digital conversion module, a microprocessor analysis calculation module and a control communication module, and the signal conditioning module is connected at one end to the microprocessor through the analog-to-digital conversion module. An analysis calculation module, the microprocessor analysis calculation module is further connected with a multiplexer, and the multiplexer is connected to the signal conditioning module through a multi-channel feedback resistor, and can automatically select a magnification factor according to the measured current magnitude to ensure the modulus Conversion The device always works in the optimal conversion range to realize high-precision measurement. The control communication module is connected to the microprocessor analysis calculation module, and communicates with the lightning protection device on-line monitoring main control unit through the control communication module.
作为优选，所述的雷击电流采集模块采用大量程无源零磁通穿心式互感器，所述避雷器泄露电流采集模块，相电压采集模块和参考电源采集模块均采用高精度有源零磁通穿心式互感器，所述微处理器分析计算模块采用的是高速数字信号处理器。所述模数转换模块采用的是16位高精度AD转换器。Preferably, the lightning strike current collecting module adopts a large-range passive zero-flux through-heart type transformer, the arrester leakage current collecting module, the phase voltage collecting module and the reference power collecting module all adopt high-precision active zero-flux through-heart The transformer, the microprocessor analysis and calculation module uses a high speed digital signal processor. The analog to digital conversion module uses a 16-bit high precision AD converter.
一种利用上述检测系统的氧化锌避雷器在线监测方法，其特征在于，其方法为，避雷器在线监测主控单元发送同步采集指令后，由避雷器泄漏电流在线监测单元的避雷器电流采集组件和母线电压在线监测单元的母线电压采集组件同时刻进行模拟量采集，之后各自把采集的模拟量经过相对独立的滤波、放大处理和AD转换后，将数字量送入各自的微处理器分析计算单元的微处理器分析计算模块，各自的微处理器分析计算单元通过动态向量补偿DFT算法的一系列独立分析计算，得出该相泄漏电流与市电的相位差
Figure PCTCN2014086188-appb-000008
和该相母线电压与市电的相位差
Figure PCTCN2014086188-appb-000009
避雷器在线监测主控单元通过通信总线读取避雷器泄露电流与避雷器所在母线电压的参考相位，通过判断比较，计算得到该相的阻性电流Ir。An online monitoring method for a zinc oxide surge arrester using the above detection system is characterized in that: the lightning arrester on-line monitoring main control unit sends a synchronous acquisition command, and the lightning arrester current collecting component of the lightning arrester online monitoring unit and the bus voltage online The bus voltage collection component of the monitoring unit simultaneously performs analog quantity acquisition, and then each of the collected analog quantities is subjected to relatively independent filtering, amplification processing and AD conversion, and then the digital quantity is sent to the microprocessor of the respective microprocessor analysis and calculation unit. The analysis and calculation module, the respective microprocessor analysis and calculation unit through a series of independent analysis and calculation of the dynamic vector compensation DFT algorithm, the phase difference between the phase leakage current and the mains is obtained.
Figure PCTCN2014086188-appb-000008
And the phase difference between the phase bus voltage and the mains
Figure PCTCN2014086188-appb-000009
The lightning arrester online monitoring main control unit reads the reference phase of the arrester leakage current and the bus voltage of the arrester through the communication bus, and obtains the resistive current Ir of the phase by judging and comparing.
进一步的，所述避雷器泄漏电流在线监测单元和母线电压在线监测单元都以市电作为参考电源采集模块的采集对象，并分别以市电的相位作为避雷器泄露电流与避雷器所在母线电压的相位参考基准。Further, the lightning arrester leakage current online monitoring unit and the bus voltage online monitoring unit both use the commercial power as the reference source collection module, and respectively use the phase of the commercial power as the phase reference of the lightning arrester leakage current and the bus voltage of the arrester. .
进一步的，所述避雷器泄漏电流在线监测单元根据避雷器实际泄漏电流值的波动范围和模数转换器的最优转换范围，确定放大倍数档位，进而选择合适阻值的反馈电阻。Further, the lightning arrester on-line monitoring unit determines the amplification factor according to the fluctuation range of the actual leakage current value of the arrester and the optimal conversion range of the analog-to-digital converter, and then selects a feedback resistor of a suitable resistance value.
进一步的，避雷器电流采集组件的避雷器泄露电流采集模块输出的模拟信号先经过滤波、初级放大和信号跟随后进入AD转换为数字量，输出给微处理器分析计算单元，根据采集单元采集的数据初次计算泄露电流值的大小，微处理器分析计算单元根据此值的大小判断是否需要调整接入电路反馈电阻；Further, the analog signal output by the arrester leakage current collecting module of the arrester current collecting component is first filtered, primary amplified, and signal-followed, and then converted into digital quantity, and output to the microprocessor analysis and calculation unit, according to the data collected by the collecting unit for the first time. Calculating the magnitude of the leakage current value, and the microprocessor analysis calculation unit determines, according to the magnitude of the value, whether the feedback resistance of the access circuit needs to be adjusted;
当需要调整时，通过控制多路选择器重新选择接入电路的反馈电阻，模拟信号再经过滤波、精确放大和信号跟随后进入AD转换为最终的数字量，输出给微处理器分析计算单元做分析计算。When adjustment is needed, the feedback resistor of the access circuit is reselected by controlling the multiplexer, and the analog signal is filtered, accurately amplified, and the signal is followed to enter AD to be converted into the final digital quantity, and output to the microprocessor analysis and calculation unit. analysis caculate.
通信控制模块采用的是485和CAN双总线通信配置，其中485通信芯片型 号为SN75LBC184；CAN通信芯片型号为：TJA1040。The communication control module uses 485 and CAN dual bus communication configuration, of which 485 communication chip type No. SN75LBC184; CAN communication chip model: TJA1040.
本发明通过上述系统及其方法，实现了对避雷器的泄露全电流、阻性电流、容性电流、雷击次数和雷击时刻的实时监测，能根据被测电流大小能自动调整放大倍数，实现高精度测量。采用谐波补偿法，同步测量、相对比较，并结合现场工况，对监测到的数据进行分析和处理，可免受环境温、湿度影响并及时地发现避雷器由污秽或内部受潮引起的瓷套泄漏电流或绝缘杆泄漏电流增大等问题，有效避免事故的发生。本发明可带电安装，能方便、快捷的接入系统。The invention realizes the real-time monitoring of the leaking full current, the resistive current, the capacitive current, the number of lightning strikes and the lightning strike time of the arrester by the above system and the method thereof, and can automatically adjust the amplification factor according to the magnitude of the measured current to achieve high precision measuring. Using harmonic compensation method, synchronous measurement, relative comparison, combined with on-site working conditions, the monitored data is analyzed and processed, which can be protected from environmental temperature and humidity and timely discover the porcelain sleeve caused by contamination or internal moisture. Problems such as leakage current or increased leakage current of the insulating rod can effectively avoid accidents. The invention can be installed electrically, and can be conveniently and quickly connected to the system.
附图说明DRAWINGS
下面结合附图和具体实施方式来详细说明本发明；The invention will be described in detail below with reference to the accompanying drawings and specific embodiments;
图1为是避雷器在线监测系统现场监测示意图。Figure 1 is a schematic diagram of on-site monitoring of the lightning arrester online monitoring system.
图2是避雷器在线监测系统计算避雷器阻性电流的流程图。2 is a flow chart of calculating the resistive current of the arrester by the lightning arrester online monitoring system.
图3是避雷器在线监测系统自动调整放大倍数的原理示意图。Figure 3 is a schematic diagram of the principle of automatically adjusting the magnification of the lightning arrester online monitoring system.
具体实施方式detailed description
为使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解，下面结合具体实施方式，进一步阐述本发明。In order to make the technical means, the authoring features, the achievement of the object and the effect of the present invention easy to understand, the present invention will be further described below in conjunction with the specific embodiments.
参照附图1，本实施例是一种氧化锌避雷器在线监测系统，该系统由避雷器在线监测主控单元、避雷器泄露电流在线监测单元和母线电压在线监测单元组成实现。其中避雷器在线监测主控单元负责命令下发，综合比较计算和数据远传；避雷器泄漏电流在线监测单元由避雷器电流采集组件和第一数据处理分析组件组成；母线电压在线监测单元由母线电压采集组件和第二数据处理分析组件组成，母线电压采集组件由相电压采集模块和参考电源采集模块两部分组成。Referring to Figure 1, the present embodiment is an online monitoring system for a zinc oxide surge arrester. The system is realized by an on-line monitoring main control unit of the arrester, an on-line monitoring unit for the leakage current of the arrester, and an on-line monitoring unit for the bus voltage. The lightning arrester online monitoring main control unit is responsible for issuing commands, comprehensive comparison calculation and data remote transmission; the lightning arrester leakage current online monitoring unit is composed of the arrester current collecting component and the first data processing and analysis component; the bus voltage online monitoring unit is composed of the bus voltage collecting component. And the second data processing and analysis component is composed, the bus voltage collecting component is composed of a phase voltage collecting module and a reference power collecting module.
本实施例中，避雷器泄漏电流在线监测单元和母线电压在线监测单元的数据处理分析组件统一化设计，分为两部分：微处理器分析计算单元和电流转换单元。微处理器分析计算单元包含信号调理模块、16位高精度AD转换模块、分析计算模块和控制通信模块。信号调理模块一端连接通过模数转换模块连接微处理器分析计算模块，微处理器分析计算模块还连接有多路选择器，所述多路选择器通过多路反馈电阻连接信号调理模块，能根据被测电流大小自动选择放大倍数，保证模数转换器始终工作于最优转换范围，进而实现高精度测量， 所述控制通信模块连接微处理器分析计算模块，通过控制通信模块与避雷器在线监测主控单元相通讯。In this embodiment, the data processing and analysis component of the lightning arrester leakage current online monitoring unit and the bus voltage online monitoring unit are unified and designed into two parts: a microprocessor analysis calculation unit and a current conversion unit. The microprocessor analysis and calculation unit includes a signal conditioning module, a 16-bit high-precision AD conversion module, an analysis calculation module, and a control communication module. One end of the signal conditioning module is connected to the microprocessor analysis and calculation module through the analog-to-digital conversion module, and the microprocessor analysis calculation module is further connected with a multi-way selector, and the multi-way selector is connected to the signal conditioning module through multiple feedback resistors, according to The measured current size automatically selects the amplification factor to ensure that the analog-to-digital converter always works in the optimal conversion range, thereby achieving high-precision measurement. The control communication module is connected to the microprocessor analysis calculation module, and communicates with the lightning protection device on-line monitoring main control unit by controlling the communication module.
母线电压在线监测单元包括用于采集避雷器泄露电压的母线电压采集组件和第二数据处理分析组件，所述母线电压采集组件分为三部分包括用于对母线相电压采集的相电压采集模块和用采集市电电压作为参考电源的第二参考电源采集模块，所述相电压采集模块和第二参考电源采集模块均与第二数据处理分析组件相连接。第一参考电源采集模块和第二参考电源采集模块分别通过电流转换单元连接市电，所述微处理器分析计算单元包括信号调理模块、模数转换模块、微处理器分析计算模块和控制通信模块。The bus voltage online monitoring unit includes a bus voltage collecting component and a second data processing analyzing component for collecting the lightning arrester leakage voltage, and the bus voltage collecting component is divided into three parts including a phase voltage collecting module for collecting the bus phase voltage and using The second reference power supply collecting module is configured to collect the mains voltage as the reference power source, and the phase voltage collecting module and the second reference power collecting module are both connected to the second data processing and analyzing component. The first reference power collection module and the second reference power collection module are respectively connected to the commercial power through a current conversion unit, and the microprocessor analysis calculation unit includes a signal conditioning module, an analog-to-digital conversion module, a microprocessor analysis calculation module, and a control communication module. .
本实施例的雷击电流采集模块采用大量程无源零磁通穿心式互感器，型号为：GP-103，可根据雷击电流有效识别雷击动作。。其他电流采集模块，避雷器泄露电流采集模块，相电压采集模块和参考电源采集模块均采用高精度有源零磁通穿心式互感器，型号为：ALS50-10A/7.07V。通信控制模块采用的是485和CAN双总线通信配置，其中485通信芯片型号为SN75LBC184；CAN通信芯片型号为：TJA1040。The lightning strike current collecting module of the embodiment adopts a large-range passive zero-flux through-heart type transformer, and the model is: GP-103, which can effectively identify the lightning strike action according to the lightning strike current. . Other current collecting modules, lightning arrester leakage current collecting module, phase voltage collecting module and reference power collecting module all adopt high-precision active zero-flux through-heart transformer, model: ALS50-10A/7.07V. The communication control module adopts 485 and CAN dual bus communication configuration, wherein the 485 communication chip model is SN75LBC184; the CAN communication chip model is: TJA1040.
附图1中，1是A相母线避雷器在线监测单元，2是B相母线避雷器在线监测单元，3是C相母线避雷器在线监测单元。5是采集避雷器泄露电流的电流互感器，6是采集避雷器雷击电流的电流互感器，7是采集参考电压的电流互感器。在B相母线避雷器在线监测单元2和C相母线避雷器在线监测单元3中对应位置的电流互感器与上述A相母线避雷器在线监测单元1中的作用一致，未做标号进行说明。4是母线电压在线监测单元。8是采集参考电压的电流互感器。9、10和11分别是采集A相母线电压、B相母线电压和C相母线电压的电流互感器。In Figure 1, 1 is the A-phase busbar arrester online monitoring unit, 2 is the B-phase busbar arrester online monitoring unit, and 3 is the C-phase busbar arrester online monitoring unit. 5 is a current transformer for collecting the leakage current of the arrester, 6 is a current transformer for collecting the lightning strike current of the arrester, and 7 is a current transformer for collecting the reference voltage. The current transformers at the corresponding positions in the B-phase busbar arrester online monitoring unit 2 and the C-phase busbar arrester online monitoring unit 3 are identical to those in the above-mentioned A-phase busbar arrester online monitoring unit 1, and are not described. 4 is the bus voltage online monitoring unit. 8 is a current transformer that collects a reference voltage. 9, 10 and 11 are current transformers for collecting the A-phase bus voltage, the B-phase bus voltage, and the C-phase bus voltage, respectively.
在实际应用中，避雷器接地末屏电缆需穿过避雷器泄漏电流在线监测单元1中的采集泄露电流的电流互感器5和采集雷击电流的电流互感器6后接入大地。这样既能在常规状态采集避雷器的泄漏电流，也可以在雷击时刻采集雷击电流，从而识别雷击动作。市电L端需经过电流转换单元后穿过采集参考电压的电流互感器7后回到N端。电流互感器5、6和7的输出信号都传输给微处理器分析计算单元进行滤波、放大、AD转换和分析计算等一系列过程。In practical applications, the arrester grounding terminal screen cable needs to pass through the arrester leakage current in the online monitoring unit 1 to collect the leakage current of the current transformer 5 and the current transformer 6 that collects the lightning current, and then access the earth. In this way, the leakage current of the arrester can be collected in a normal state, and the lightning current can be collected at the time of lightning strike, thereby identifying the lightning strike action. The L terminal of the mains needs to pass through the current conversion unit and then passes through the current transformer 7 that collects the reference voltage and then returns to the N terminal. The output signals of the current transformers 5, 6, and 7 are transmitted to the microprocessor analysis and calculation unit for filtering, amplification, AD conversion, and analysis and calculation.
在实际应用中，从母线电压互感器端子箱引出A、B、C三相电压经过母线 电压在线监测单元的电流转换单元后，分别穿过采集A相母线电压、B相母线电压和C相母线电压的电流互感器9、10和11后，接入大地。这样完成了母线A、B、C三相电压信号的采集。市电L端需经过电流转换单元后穿过采集参考电压的电流互感器8后回到N端。电流互感器8、9、10和11的输出信号都传输给微处理器分析计算单元进行滤波、放大、AD转换和分析计算等一系列过程。In practical applications, the three-phase voltages of A, B, and C are drawn from the busbar voltage transformer terminal box through the busbar. After the current conversion unit of the voltage online monitoring unit passes through the current transformers 9, 10 and 11 that collect the A-phase bus voltage, the B-phase bus voltage, and the C-phase bus voltage, respectively, the ground is connected. This completes the acquisition of the three-phase voltage signals of the busbars A, B, and C. The L terminal of the mains needs to pass through the current conversion unit and then pass through the current transformer 8 that collects the reference voltage and then returns to the N terminal. The output signals of the current transformers 8, 9, 10 and 11 are transmitted to the microprocessor analysis and calculation unit for filtering, amplification, AD conversion and analysis and calculation.
在实际应用中，避雷器在线监测主控单元，避雷器在线监测单元和母线电压在线监测单元之间优先使用CAN总线通信，可以满足要求的话也可选用485总线通信。系统最终监测的结果，例如泄露全电流、阻性电路、容性电流、相角差、雷击次数和雷击时间等信息由避雷器在线监测主控单元按照实际要求的规约格式发送给后台主控室，完成一次完整的避雷器状态监测过程。In practical applications, the lightning arrester online monitoring main control unit, the lightning arrester online monitoring unit and the bus voltage online monitoring unit use the CAN bus communication preferentially, and the 485 bus communication can also be selected if the requirement is met. The results of the final monitoring of the system, such as leakage of full current, resistive circuit, capacitive current, phase angle difference, number of lightning strikes and lightning strike time, are sent to the background control room by the online monitoring unit of the arrester according to the actual required specification format. Complete a complete arrester status monitoring process.
参照附图2，避雷器在线监测主控单元发送同步采集指令后，由避雷器泄漏电流在线监测单元的避雷器电流采集组件和母线电压在线监测单元的母线电压采集模块同时刻进行模拟量采集，之后各自把采集的模拟量经过相对独立的滤波、放大处理和16位高精度AD转换后，将数字量送入各自的微处理器分析计算单元的分析计算模块，两个单元通过动态向量补偿DFT算法等一系列独立分析计算，得出该相泄漏电流与市电的相位差
Figure PCTCN2014086188-appb-000010
和该相母线电压与市电的相位差
Figure PCTCN2014086188-appb-000011
避雷器在线监测主控单元通过通信总线读取避雷器泄露电流与避雷器所在母线电压的参考相位，通过综合分析比较，计算得到该相的阻性电流Ir。Referring to FIG. 2, after the lightning arrester online monitoring main control unit sends the synchronous acquisition instruction, the arrester current collecting component of the arrester leakage current online monitoring unit and the bus voltage collecting module of the bus voltage online monitoring unit simultaneously perform analog quantity acquisition, and then respectively After the collected analog quantity is relatively independent filtering, amplification processing and 16-bit high-precision AD conversion, the digital quantity is sent to the analysis and calculation module of the respective microprocessor analysis and calculation unit, and the two units pass the dynamic vector compensation DFT algorithm. Series independent analysis and calculation, the phase difference between the phase leakage current and the mains is obtained.
Figure PCTCN2014086188-appb-000010
And the phase difference between the phase bus voltage and the mains
Figure PCTCN2014086188-appb-000011
The lightning arrester online monitoring main control unit reads the leakage current of the arrester and the reference phase of the bus voltage of the arrester through the communication bus, and obtains the resistive current Ir of the phase through comprehensive analysis and comparison.
参照附图3，首先根据避雷器实际泄漏电流值的波动范围和模数转换器的最优转换范围，确定放大倍数档位，进而选择合适阻值的反馈电阻。多路选择器由微处理器分析计算单元控制某一路的开断，默认选择放大倍数最小的一路反馈电阻。避雷器泄露电流采集模块输出的模拟信号先经过滤波、初级放大和信号跟随后进入AD转换为数字量，输出给微处理器分析计算单元，根据采集单元采集的数据初次计算泄露电流值的大小，微处理器分析计算单元根据此值的大小判断是否需要调整接入电路反馈电阻。需要调整时，通过控制多路选择器重新选择接入电路的反馈电阻，模拟信号再经过滤波、精确放大和信号跟随后进入AD转换为最终的数字量，输出给微处理器分析计算单元做分析计算。Referring to FIG. 3, firstly, according to the fluctuation range of the actual leakage current value of the arrester and the optimal conversion range of the analog-to-digital converter, the amplification factor is determined, and then a feedback resistor of a suitable resistance is selected. The multiplexer is controlled by the microprocessor analysis and calculation unit to control the breaking of a certain path. By default, one feedback resistor with the smallest amplification factor is selected. The analog signal output by the lightning arrester leakage current acquisition module is first filtered, primary amplified and signal-followed, then converted into digital quantity, output to the microprocessor analysis and calculation unit, and the leakage current value is calculated for the first time according to the data collected by the acquisition unit. The processor analysis calculation unit determines whether the access circuit feedback resistance needs to be adjusted according to the magnitude of the value. When adjustment is needed, the feedback resistor of the access circuit is reselected by controlling the multiplexer. After the analog signal is filtered, accurately amplified, and the signal is followed, the AD is converted into the final digital quantity, and the output is sent to the microprocessor analysis and calculation unit for analysis. Calculation.
本发明计算得到避雷器泄露电流与避雷器所在母线电压的相位差，根据实际情况，避雷器泄漏电流在线监测单元和母线电压在线监测单元都以市电作为 参考电源采集模块的采集对象，并分别以市电的相位作为避雷器泄露电流与避雷器所在母线电压的相位参考基准。并在于采用同步采集、独立运算，相对比较的方法计算得到避雷器泄露电流与避雷器所在母线电压的相位差，进而容易计算得到阻性电流。实现步骤包括：The invention calculates the phase difference between the leakage current of the arrester and the bus voltage of the arrester. According to the actual situation, the on-line monitoring unit of the arrester leakage current and the online monitoring unit of the bus voltage are all based on the mains Refer to the acquisition object of the power acquisition module, and use the phase of the mains as the phase reference for the leakage current of the arrester and the bus voltage of the arrester. In the synchronous acquisition, independent calculation, the relative comparison method is used to calculate the phase difference between the leakage current of the arrester and the bus voltage of the arrester, and the resistive current is easily calculated. Implementation steps include:
i.在运行中的某一时刻，由避雷器在线监测主控单元向避雷器泄漏电流在线监测单元和母线电压在线监测单元发送同步采集指令；i. At a certain moment in operation, the lightning monitoring device online monitoring main control unit sends a synchronous acquisition instruction to the arrester leakage current online monitoring unit and the bus voltage online monitoring unit;
ii.避雷器泄漏电流在线监测单元采集所在相的避雷器泄露电流和市电的信息，经微处理器分析计算单元的动态向量补偿DFT算法得到该相泄露电流基波相位
Figure PCTCN2014086188-appb-000012
与市电基波相位
Figure PCTCN2014086188-appb-000013
，计算两者相位差
Figure PCTCN2014086188-appb-000014
；Ii. Lightning arrester leakage current online monitoring unit collects the lightning arrester leakage current and mains information of the phase, and obtains the phase leakage current fundamental phase by the dynamic vector compensation DFT algorithm of the microprocessor analysis and calculation unit.
Figure PCTCN2014086188-appb-000012
Phase with the mains fundamental
Figure PCTCN2014086188-appb-000013
, calculate the phase difference between the two
Figure PCTCN2014086188-appb-000014
;
iii.母线电压在线监测单元同步采集避雷器所在母线所在相的相电压和市电电压，经微处理器分析计算单元的动态向量补偿DFT算法得到该相母线电压基波相位
Figure PCTCN2014086188-appb-000015
与市电基波相位
Figure PCTCN2014086188-appb-000016
，计算两者相位差
Figure PCTCN2014086188-appb-000017
；Iii. The bus voltage online monitoring unit synchronously collects the phase voltage and the mains voltage of the phase of the busbar where the arrester is located, and obtains the fundamental frequency of the phase bus voltage by the dynamic vector compensation DFT algorithm of the microprocessor analysis and calculation unit.
Figure PCTCN2014086188-appb-000015
Phase with the mains fundamental
Figure PCTCN2014086188-appb-000016
, calculate the phase difference between the two
Figure PCTCN2014086188-appb-000017
;
iv.避雷器在线监测主控单元通过通信总线读取上述两个相位差，进而可以根据
Figure PCTCN2014086188-appb-000018
，计算得到该相的阻性电流。Iv. The lightning arrester online monitoring main control unit reads the above two phase differences through the communication bus, and then can be based on
Figure PCTCN2014086188-appb-000018
The resistive current of the phase is calculated.
所述的避雷器在线监测系统中的避雷器泄漏电流在线监测单元，创新之处在于能根据被测电流大小自动选择放大倍数，保证模数转换器始终工作于最优转换范围，进而实现高精度测量。实现方法是：The lightning arrester leakage current online monitoring unit in the lightning arrester online monitoring system has the innovation that the amplification factor can be automatically selected according to the measured current to ensure that the analog-to-digital converter always works in the optimal conversion range, thereby achieving high-precision measurement. The implementation method is:
i.根据避雷器实际泄漏电流值的波动范围和模数转换器的最优转换范围，确定放大倍数档位；i. determining the amplification factor according to the fluctuation range of the actual leakage current value of the arrester and the optimal conversion range of the analog-to-digital converter;
ii.利用多路选择器建立同相运算放大器反馈电阻网络，根据采集单元采集的数据初次计算泄露电流值的大小，微处理器自动选择不同的通路来调整反馈电阻值，进而调整了放大倍数，将放大器的输出调整到模数转换器的最优转换范围进行模数转换，实现了高精度测量。Ii. Using a multiplexer to establish a feedback resistor network of the non-inverting operational amplifier, and calculating the value of the leakage current for the first time according to the data collected by the acquisition unit, the microprocessor automatically selects different paths to adjust the feedback resistance value, and then adjusts the amplification factor. The output of the amplifier is adjusted to the optimal conversion range of the analog-to-digital converter for analog-to-digital conversion, enabling high-accuracy measurements.
本发明提供了一种设计科学、实用性强、安全可靠和安装便捷的避雷器在线监测系统。本发明所涉及的避雷器在线监测系统通过对避雷器的全电流、阻性电流、容性电流、雷击次数及雷击时刻进行实时在线监测，可实现对高压电气设备的绝缘状况进行实时监测；同时，通过分析监测数据可及时发现金属氧化锌避雷器潜在的故障并为状态检修提供重要的数据依据，为电力系统安全、可靠、稳定、经济的运行提供了一个强力、可靠的保证，为运行检修人员提供可靠的设备绝缘信息和科学的检修依据，从而达到减少事故发生，延长检修间 隔，减少停电检修次数和时间，提高设备利用率和整体经济效益的目的。The invention provides an online monitoring system for lightning arresters with scientific design, strong practicability, safety and reliability and convenient installation. The online monitoring system of the arrester according to the present invention can realize real-time monitoring of the insulation condition of the high-voltage electrical equipment by real-time online monitoring of the full current, resistive current, capacitive current, lightning strike number and lightning strike timing of the arrester; Analyze the monitoring data to discover the potential failure of the metal zinc oxide arrester and provide an important data basis for the state maintenance, which provides a strong and reliable guarantee for the safe, reliable, stable and economic operation of the power system, and provides reliable operation and maintenance personnel. Equipment insulation information and scientific maintenance basis, so as to reduce accidents and extend the maintenance room Separate, reduce the number and time of power outages, improve equipment utilization and overall economic benefits.
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解，本发明不受上述实施例的限制，上述实施例和说明书中描述的只是说明本发明的原理，在不脱离本发明精神和范围的前提下，本发明还会有各种变化和改进，这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。 The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited by the foregoing embodiments, and that the present invention is only described in the foregoing description and the description of the present invention, without departing from the spirit and scope of the invention. Various changes and modifications are intended to be included within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and their equivalents.

Claims (10)

  1. 一种氧化锌避雷器在线监测系统，其特征在于，其包括：An online monitoring system for a zinc oxide surge arrester, comprising:
    避雷器泄漏电流在线监测单元，用于采集所在相的避雷器泄露电流和市电的信息，并计算得到该相泄露电流基波相位
    Figure PCTCN2014086188-appb-100001
    与市电基波相位
    Figure PCTCN2014086188-appb-100002
    计算两者相位差
    Figure PCTCN2014086188-appb-100003
    The lightning arrester leakage current online monitoring unit is used to collect the leakage current and the mains information of the arrester of the phase, and calculate the fundamental phase of the leakage current of the phase
    Figure PCTCN2014086188-appb-100001
    Phase with the mains fundamental
    Figure PCTCN2014086188-appb-100002
    Calculate the phase difference between the two
    Figure PCTCN2014086188-appb-100003
    母线电压在线监测单元，与避雷器泄漏电流在线监测单元同步，用于采集避雷器所在母线所在相的相电压和市电电压，经微处理器分析计算单元的动态向量补偿DFT算法得到该相母线电压基波相位
    Figure PCTCN2014086188-appb-100004
    与市电基波相位
    Figure PCTCN2014086188-appb-100005
    计算两者相位差
    Figure PCTCN2014086188-appb-100006
    The bus voltage online monitoring unit is synchronized with the arrester leakage current online monitoring unit, and is used for collecting the phase voltage and the mains voltage of the phase of the busbar where the arrester is located, and obtaining the phase bus voltage base by the dynamic vector compensation DFT algorithm of the microprocessor analysis and calculation unit. Wave phase
    Figure PCTCN2014086188-appb-100004
    Phase with the mains fundamental
    Figure PCTCN2014086188-appb-100005
    Calculate the phase difference between the two
    Figure PCTCN2014086188-appb-100006
    避雷器在线监测主控单元，用于负责命令避雷器泄漏电流在线监测单元和母线电压在线监测单元，比较计算和数据远传，并通过通信总线读取避雷器泄露电流与避雷器所在母线电压的参考相位，根据判断比较计算公式
    Figure PCTCN2014086188-appb-100007
    得到该相的阻性电流；    The lightning arrester online monitoring main control unit is responsible for commanding the lightning arrester leakage current online monitoring unit and the bus voltage online monitoring unit, comparing calculation and data remote transmission, and reading the lightning arrester leakage current and the reference phase of the bus voltage of the arrester through the communication bus, according to Judging the comparison formula
    Figure PCTCN2014086188-appb-100007
    Obtaining a resistive current of the phase;
    所述避雷器泄漏电流在线监测单元和母线电压在线监测单元均与避雷器在线监测主控单元相通讯。The lightning arrester leakage current online monitoring unit and the bus voltage online monitoring unit are both in communication with the lightning arrester online monitoring main control unit.
  2. 根据权利要求1所述的氧化锌避雷器在线监测系统，其特征在于，所述避雷器在线监测单元包括：用于采集所在相的避雷器泄露电流和市电的信息的避雷器电流采集组件和用于对采集数据计算的第一数据处理分析组件；所述避雷器电流采集组件与第一数据处理分析组件相连接。The on-line monitoring system for a zinc oxide surge arrester according to claim 1, wherein the lightning arrester online monitoring unit comprises: an arrester current collecting component for collecting lightning arrester leakage current and mains information of the phase, and for collecting A first data processing analysis component of the data calculation; the arrester current acquisition component is coupled to the first data processing analysis component.
  3. 根据权利要求2所述的氧化锌避雷器在线监测系统，其特征在于，所述避雷器电流采集组件包括用于采集避雷器泄露电流的避雷器泄露电流采集模块、用于雷击过程中过电压的雷击过压电流采集模块和用于采集市电电流作为参考电源的第一参考电源采集模块；所述避雷器泄露电流采集模块、雷击过压电流采集模块、第一参考电源采集模块均与微处理器分析计算单元相连接，所述第一参考电源采集模块均通过电流转换单元连接市电。The on-line monitoring system for a zinc oxide surge arrester according to claim 2, wherein the arrester current collecting component comprises a lightning arrester leakage current collecting module for collecting a lightning arrester leakage current, and a lightning strike overvoltage current for overvoltage during a lightning strike. The acquisition module and the first reference power collection module for collecting the utility power as the reference power source; the lightning arrester leakage current collection module, the lightning overvoltage current collection module, and the first reference power collection module are all combined with the microprocessor analysis and calculation unit Connected, the first reference power collection module is connected to the mains through a current conversion unit.
  4. 根据权利要求3所述的氧化锌避雷器在线监测系统，其特征在于，所述母线电压在线监测单元包括用于采集避雷器泄露电压的母线电压采集组件和第二数据处理分析组件，所述母线电压采集组件包括用于对母线相电压采集的相电压采集模块和用采集市电电压作为参考电源的第二参考电源采集模块，所述相电压采集模块和第二参考电源采集模块均与第二数据处理分析组件相连接。 The on-line monitoring system for a zinc oxide surge arrester according to claim 3, wherein the bus voltage online monitoring unit comprises a bus voltage collecting component for collecting a lightning arrester leakage voltage and a second data processing and analyzing component, the bus voltage collecting component The component includes a phase voltage collecting module for collecting the bus phase voltage and a second reference power collecting module for collecting the mains voltage as a reference power source, and the phase voltage collecting module and the second reference power collecting module are both associated with the second data processing The analysis components are connected.
  5. 根据权利要求4所述的氧化锌避雷器在线监测系统，其特征在于，所述第一数据处理分析组件和第二数据处理分析组件均包括微处理器分析计算单元和电流转换单元，所述第一参考电源采集模块和第二参考电源采集模块分别通过电流转换单元连接市电，所述微处理器分析计算单元包括信号调理模块、模数转换模块、微处理器分析计算模块和控制通信模块，所述信号调理模块一端连接通过模数转换模块连接微处理器分析计算模块，所述微处理器分析计算模块还连接有多路选择器，所述多路选择器通过多路反馈电阻连接信号调理模块；所述控制通信模块连接微处理器分析计算模块，并通过控制通信模块与避雷器在线监测主控单元相通讯。The zinc oxide arrester online monitoring system according to claim 4, wherein the first data processing analysis component and the second data processing analysis component each comprise a microprocessor analysis calculation unit and a current conversion unit, the first The reference power collection module and the second reference power collection module are respectively connected to the commercial power through a current conversion unit, and the microprocessor analysis calculation unit includes a signal conditioning module, an analog-to-digital conversion module, a microprocessor analysis calculation module, and a control communication module. One end of the signal conditioning module is connected to the microprocessor analysis calculation module through an analog-to-digital conversion module, and the microprocessor analysis calculation module is further connected with a multiplexer, and the multiplexer is connected to the signal conditioning module through multiple feedback resistors. The control communication module is connected to the microprocessor analysis calculation module, and communicates with the lightning protection device on-line monitoring main control unit through the control communication module.
  6. 根据权利要求5所述的氧化锌避雷器在线监测系统，其特征在于，所述的雷击电流采集模块采用大量程无源零磁通穿心式互感器，所述避雷器泄露电流采集模块，相电压采集模块和参考电源采集模块均采用高精度有源零磁通穿心式互感器，所述微处理器分析计算模块采用的是高速数字信号处理器。The zinc oxide arrester online monitoring system according to claim 5, wherein the lightning current collecting module adopts a large-range passive zero-flux through-core transformer, the arrester leakage current collecting module, a phase voltage collecting module and The reference power collection module uses a high-precision active zero-flux core-through transformer, and the microprocessor analysis and calculation module uses a high-speed digital signal processor.
  7. 一种根据权利要求5或6任意一项所述检测系统的氧化锌避雷器在线监测方法，其特征在于，其方法为，避雷器在线监测主控单元发送同步采集指令后，由避雷器泄漏电流在线监测单元的避雷器电流采集组件和母线电压在线监测单元的母线电压采集组件同时刻进行模拟量采集，之后各自把采集的模拟量经过相对独立的滤波、放大处理和AD转换后，将数字量送入各自的微处理器分析计算单元的微处理器分析计算模块，各自的微处理器分析计算单元通过动态向量补偿DFT算法的一系列独立分析计算，得出该相泄漏电流与市电的相位差An online monitoring method for a zinc oxide surge arrester according to any one of claims 5 or 6, wherein the method is: after the lightning protection device online monitoring main control unit sends a synchronous acquisition instruction, the lightning arrester leakage current online monitoring unit The arrester current collecting component and the bus voltage collecting component of the bus voltage online monitoring unit simultaneously perform analog quantity acquisition, and then respectively send the collected analog quantity to the respective ones after relatively independent filtering, amplification processing and AD conversion. The microprocessor analyzes the calculation unit of the microprocessor and analyzes the calculation unit. The respective microprocessor analysis and calculation unit calculates the phase difference between the phase leakage current and the mains by a series of independent analysis and calculation of the dynamic vector compensation DFT algorithm.
    Figure PCTCN2014086188-appb-100008
    和该相母线电压与市电的相位差
    Figure PCTCN2014086188-appb-100009
    避雷器在线监测主控单元通过通信总线读取避雷器泄露电流与避雷器所在母线电压的参考相位，通过判断差值比较和计算，得到该相的阻性电流Ir。
    Figure PCTCN2014086188-appb-100008
    And the phase difference between the phase bus voltage and the mains
    Figure PCTCN2014086188-appb-100009
    The lightning arrester online monitoring main control unit reads the reference phase of the arrester leakage current and the bus voltage of the arrester through the communication bus, and obtains the resistive current Ir of the phase by judging the difference comparison and calculation.
  8. 根据权利要求1所述的氧化锌避雷器在线监测方法，其特征在于，所述避雷器泄漏电流在线监测单元和母线电压在线监测单元都以市电作为参考电源采集模块的采集对象，并分别以市电的相位作为避雷器泄露电流与避雷器所在母线电压的相位参考基准。The on-line monitoring method for a zinc oxide surge arrester according to claim 1, wherein the lightning arrester leakage current online monitoring unit and the bus voltage online monitoring unit both use the commercial power as the reference power collection module, and respectively use the commercial power The phase serves as a phase reference for the arrester leakage current and the bus voltage at which the arrester is located.
  9. 根据权利要求1所述的氧化锌避雷器在线监测方法，其特征在于，所述避雷器泄漏电流在线监测单元根据避雷器实际泄漏电流值的波动范围和模数转换器的最优转换范围，确定放大倍数档位，进而选择合适阻值的反馈电阻。The on-line monitoring method for a zinc oxide surge arrester according to claim 1, wherein the lightning arrester on-line monitoring unit determines the amplification factor according to the fluctuation range of the actual leakage current value of the arrester and the optimal conversion range of the analog-to-digital converter. Bit, and then select the feedback resistor of the appropriate resistance.
  10. 根据权利要求9所述的氧化锌避雷器在线监测方法，其特征在于，避雷 器电流采集组件的避雷器泄露电流采集模块输出的模拟信号先经过滤波、初级放大和信号跟随后进入AD转换为数字量，输出给微处理器分析计算单元，根据采集单元采集的数据初次计算泄露电流值的大小，微处理器分析计算单元根据此值的大小判断是否需要调整接入电路反馈电阻；The method for online monitoring of a zinc oxide surge arrester according to claim 9, wherein the lightning protection The current signal output by the arrester current collecting module of the current collecting component is filtered, the primary amplification and the signal are followed, then enter AD to convert into digital quantity, output to the microprocessor analysis and calculation unit, and calculate the leakage current for the first time according to the data collected by the collecting unit. The size of the value, the microprocessor analysis and calculation unit determines whether it is necessary to adjust the feedback resistance of the access circuit according to the magnitude of the value;
    当需要调整时，通过控制多路选择器重新选择接入电路的反馈电阻，模拟信号再经过滤波、精确放大和信号跟随后进入AD转换为最终的数字量，输出给微处理器分析计算单元做分析计算。 When adjustment is needed, the feedback resistor of the access circuit is reselected by controlling the multiplexer, and the analog signal is filtered, accurately amplified, and the signal is followed to enter AD to be converted into the final digital quantity, and output to the microprocessor analysis and calculation unit. analysis caculate.
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