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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Priority to CN201410044610.1A priority patent/CN103869183A/en
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Publication of WO2015117304A1 publication Critical patent/WO2015117304A1/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing 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
    • G01R31/1227Testing 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
    • G01R31/1236Testing 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52Testing for short-circuits, leakage current or ground faults

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

Online monitoring system for zinc oxide arrester and method thereof Technical field

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.

Background technique

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.

Summary of the invention

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.

In order to achieve the above object, the present invention is achieved by the following technical solutions:

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

Figure PCTCN2014086188-appb-000001
Phase with the mains fundamental
Figure PCTCN2014086188-appb-000002
, calculate the phase difference between the two
Figure PCTCN2014086188-appb-000003
;

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
;

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;

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.

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.

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.

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.

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.

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.

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.

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. .

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.

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;

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.

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. 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.

DRAWINGS

The invention will be described in detail below with reference to the accompanying drawings and specific embodiments;

Figure 1 is a schematic diagram of on-site monitoring of the lightning arrester online monitoring system.

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.

detailed description

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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. 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. 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. 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. 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.

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. 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. 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.

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.

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. An online monitoring system for a zinc oxide surge arrester, comprising:
    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
    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
    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;
    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. 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. 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. 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. 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. 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. 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
    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. 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. 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. 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;
    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.
PCT/CN2014/086188 2014-02-07 2014-09-10 System for online monitoring of zinc oxide arrester and method thereof WO2015117304A1 (en)

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CN105572517A (en) * 2016-02-26 2016-05-11 贵州电网有限责任公司铜仁供电局 Online monitoring type intelligent electrified switching-in protection device of lightning arrester and control method
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CN104360127B (en) * 2014-06-25 2018-03-16 许继电气股份有限公司 Arrester on-line monitoring is with voltage acquisition methods and obtains system
CN105044437A (en) * 2015-08-07 2015-11-11 南方电网科学研究院有限责任公司 Method for measuring resistive current of metal oxide lightning arrester
CN105044524B (en) * 2015-08-10 2018-12-04 许继集团有限公司 A kind of arrester monitoring method and system suitable for intelligent substation
CN105929284A (en) * 2016-06-24 2016-09-07 国网辽宁省电力有限公司抚顺供电公司 Wireless tester and testing method for live-line measuring zinc oxide arrester
CN106168640B (en) * 2016-06-27 2019-01-25 国网江苏省电力公司宿迁供电公司 A kind of Zinc-Oxide Arrester state online test method
CN106646034B (en) * 2016-11-28 2019-04-05 电子科技大学 A kind of arrester structural health on-line monitoring analysis system
CN107632223B (en) * 2017-07-25 2020-04-24 国网山东省电力公司青岛供电公司 Lightning arrester diagnosis method, device, terminal and computer-readable storage medium
CN107918091A (en) * 2017-11-09 2018-04-17 山东孚岳电气有限公司 Arrester terminal data acquisition system
CN109324223A (en) * 2018-07-30 2019-02-12 宜宾志源高压电器有限公司 A kind of plateau type Zinc-Oxide Arrester on-line monitoring method
CN109143141B (en) * 2018-08-27 2020-09-01 云南电网有限责任公司电力科学研究院 VFTO test system and method for detecting reliability of online monitoring system
CN109254198A (en) * 2018-10-08 2019-01-22 许昌许继软件技术有限公司 The synchronous data sampling system and data acquisition device of arrester

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