CN106066437B - A kind of on-line monitoring device of metallic oxide arrester and its monitoring method - Google Patents
A kind of on-line monitoring device of metallic oxide arrester and its monitoring method Download PDFInfo
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Abstract
本发明公开了一种金属氧化物避雷器在线监测装置及其监测方法，包括：主控芯片，采集泄漏电流信号和电压信号的数据采集模块，接收数据采集模块的数据并计算出阻性电流传送到主控芯片的后台算法处理模块，交互连接于主控芯片的人机交互组件；数据采集模块包括：用于测量金属氧化物避雷器避雷器两端的电压以及金属氧化物避雷器避雷器的泄露电流的电压电流测量模块，接收电压电流测量模块的信号并进行滤波处理的滤波模块，接收滤波模块的信号并进行AD转换的AD转换模块。本发明提供一种金属氧化物避雷器在线监测装置及其监测方法，本发明充分考虑电压中的谐波对阻性电流提取的影响，可以很好的减小由于谐波电压对阻性电流提取的干扰，提高在线监测的效率与准确性。
The invention discloses an on-line monitoring device and a monitoring method for a metal oxide lightning arrester, comprising: a main control chip, a data acquisition module for collecting leakage current signals and voltage signals, receiving data from the data acquisition module and calculating the resistive current and sending it to The background algorithm processing module of the main control chip is interactively connected to the human-computer interaction component of the main control chip; the data acquisition module includes: voltage and current measurement for measuring the voltage at both ends of the metal oxide arrester arrester and the leakage current of the metal oxide arrester arrester The module is a filter module that receives the signal of the voltage and current measurement module and performs filtering processing, and an AD conversion module that receives the signal of the filter module and performs AD conversion. The invention provides an online monitoring device and a monitoring method for a metal oxide arrester. The invention fully considers the influence of harmonics in the voltage on the extraction of resistive current, and can well reduce the impact of harmonic voltage on the extraction of resistive current. Interference, improve the efficiency and accuracy of online monitoring.
Description
技术领域technical field
本发明涉及电气设备测试技术领域，特别是一种金属氧化物避雷器在线监测装置及其监测方法。The invention relates to the technical field of electrical equipment testing, in particular to an online monitoring device and a monitoring method for a metal oxide arrester.
背景技术Background technique
金属氧化物避雷器避雷器(MOA)具有非线性特性好、通流量大、保护性能优越等优良特性，是电力系统继电保护的主要装置。MOA长期在线工作受到热破坏、暂态、谐态过电压冲击以及内部潮湿等因素的影响，加速金属氧化物避雷器避雷器的老化劣化，导致避雷器损坏，最终使避雷器丧失保护作用。因此对运行中的避雷器进行监测是电力系统安全可靠运行的重要保证。国内外许多研究成果指出，MOA老化、内部受潮以及绝缘性能不良时，泄漏电流会增加，其中阻性电流分量增加明显，因此阻性电流是监测避雷器运行状态的重要参量。Metal Oxide Arrester (MOA) has excellent characteristics such as good nonlinear characteristics, large flow rate, and excellent protection performance. It is the main device for relay protection in power systems. The long-term online work of MOA is affected by factors such as thermal damage, transient, harmonic overvoltage impact, and internal moisture, which accelerates the aging and deterioration of the metal oxide arrester arrester, resulting in damage to the arrester, and finally the arrester loses its protective effect. Therefore, monitoring the surge arresters in operation is an important guarantee for the safe and reliable operation of the power system. Many research results at home and abroad point out that the leakage current will increase when the MOA is aging, the interior is damp and the insulation performance is poor, and the resistive current component increases significantly. Therefore, the resistive current is an important parameter to monitor the operation status of the arrester.
经典的容性电流补偿法不能去除容性电流中的谐波分量，这样的谐波分量会混入阻性电流中，导致该算法的阻性电流产生误差，从而影响阻性电流的提取精度，容易造成对金属氧化物避雷器状态的误判。The classical capacitive current compensation method cannot remove the harmonic component in the capacitive current, and such harmonic component will be mixed into the resistive current, which will cause an error in the resistive current of the algorithm, thereby affecting the extraction accuracy of the resistive current, which is easy to Cause misjudgment of the state of the metal oxide arrester.
发明内容Contents of the invention
为解决现有技术的不足，本发明的目的在于提供一种金属氧化物避雷器在线监测装置及其监测方法，本发明充分考虑电压中的谐波对阻性电流提取的影响，可以很好的减小由于谐波电压对阻性电流提取的干扰，提高在线监测的效率与准确性。In order to solve the deficiencies in the prior art, the object of the present invention is to provide an online monitoring device and monitoring method for a metal oxide arrester. The present invention fully considers the influence of harmonics in the voltage on the extraction of resistive current, which can well reduce the Minimize the interference of harmonic voltage on resistive current extraction, and improve the efficiency and accuracy of online monitoring.
为了实现上述目标，本发明采用如下的技术方案：In order to achieve the above object, the present invention adopts the following technical solutions:
一种金属氧化物避雷器在线监测装置，包括：主控芯片，采集泄漏电流信号和电压信号的数据采集模块，接收数据采集模块的数据并计算出阻性电流传送到主控芯片的后台算法处理模块，交互连接于主控芯片的人机交互组件；数据采集模块包括：用于测量金属氧化物避雷器两端的电压以及金属氧化物避雷器的泄漏电流的电压电流测量模块，接收电压电流测量模块的信号并进行滤波处理的滤波模块，接收滤波模块的信号并进行AD转换的AD转换模块。An online monitoring device for metal oxide arresters, including: a main control chip, a data acquisition module for collecting leakage current signals and voltage signals, a background algorithm processing module that receives data from the data acquisition module and calculates the resistive current and transmits it to the main control chip , a human-computer interaction component interactively connected to the main control chip; the data acquisition module includes: a voltage and current measurement module for measuring the voltage at both ends of the metal oxide arrester and the leakage current of the metal oxide arrester, receiving the signal from the voltage and current measurement module and A filter module for filter processing, and an AD conversion module for receiving signals from the filter module and performing AD conversion.
前述的一种金属氧化物避雷器在线监测装置，人机交互组件组成有：连接于主控芯片的GPRS模块，连接于GPRS模块的PC机，连接于PC机的显示模块。The aforesaid online monitoring device for metal oxide arresters consists of human-computer interaction components: a GPRS module connected to the main control chip, a PC connected to the GPRS module, and a display module connected to the PC.
前述的一种金属氧化物避雷器在线监测装置，后台算法处理模块包括：电压信号读取模块，用于对电压信号进行90°移相的移相器，接收并检测移相器传递来的电压信号的波形检测器，用于对读取的电压信号进行FFT分析的FFT模块，泄漏电流读取模块，连接于电压信号读取模块、泄漏电流读取模块的过零检测器，连接于FFT模块和过零检测器并计算出晶介电容值C和电容补偿系数G的G、C计算模块，连接于波形检测器和G、C计算模块的乘法器，连接于乘法器和泄漏电流读取模块的减法器。The aforementioned online monitoring device for metal oxide arresters, the background algorithm processing module includes: a voltage signal reading module, a phase shifter for performing 90° phase shift on the voltage signal, receiving and detecting the voltage signal transmitted by the phase shifter The waveform detector, the FFT module used for FFT analysis of the read voltage signal, the leakage current reading module, the zero-crossing detector connected to the voltage signal reading module and the leakage current reading module, connected to the FFT module and The zero-crossing detector and calculates the G and C calculation modules of the crystal capacitance C and the capacitance compensation coefficient G, connected to the waveform detector and the multiplier of the G and C calculation modules, and connected to the multiplier and the subtraction of the leakage current reading module device.
前述的一种金属氧化物避雷器在线监测装置的监测方法包括如下步骤：The aforementioned monitoring method of a metal oxide arrester online monitoring device comprises the following steps:
(1)获取金属氧化物避雷器的初始电压u以及初始泄漏电流ix；(1) Obtain the initial voltage u and initial leakage current i x of the metal oxide arrester;
(2)将初始电压信号进行FFT分析，得到基波电压幅值u1、3次谐波电压幅值u3以及频率w；(2) Perform FFT analysis on the initial voltage signal to obtain fundamental voltage amplitude u 1 , third harmonic voltage amplitude u 3 and frequency w;
(3)将初始电压和初始泄漏电流通过过零检测器，找到初始电压为零时刻对应的泄漏电流ix(t0)；(3) pass the initial voltage and the initial leakage current through the zero-crossing detector, and find the leakage current i x (t 0 ) corresponding to the moment when the initial voltage is zero;
(4)将步骤2、3所得到的基波电压幅值u1、3次谐波电压幅值u3、频率w、泄漏电流ix(t0)带入式(1)得到晶介电容值C，(4) Put the fundamental voltage amplitude u 1 , third harmonic voltage amplitude u 3 , frequency w, and leakage current i x (t 0 ) obtained in steps 2 and 3 into formula (1) to obtain the dielectric capacitance C,
(5)将步骤2、4所得到的基波电压幅值u1、3次谐波电压幅值u3、频率w、晶介电容值C带入式(2)得到电容补偿系数G，(5) Put the fundamental voltage amplitude u 1 , third harmonic voltage amplitude u 3 , frequency w, and dielectric capacitance C obtained in steps 2 and 4 into formula (2) to obtain the capacitance compensation coefficient G,
(6)将初始电压信号通过移相器逆时针移相90°，通过波形检测得到移相后的电压usf；(6) The initial voltage signal is shifted counterclockwise by 90° through the phase shifter, and the phase-shifted voltage u sf is obtained through waveform detection;
(7)将步骤5、6所得到的电容补偿系数G、电压usf通过乘法器相乘；(7) the capacitance compensation coefficient G obtained in steps 5 and 6, the voltage u sf are multiplied by a multiplier;
(8)将步骤1所获取的初始泄漏电流ix以及步骤7所得到的结果通过减法器相减，得到阻性电流分量iR；(8) Subtract the initial leakage current i x obtained in step 1 and the result obtained in step 7 through a subtractor to obtain the resistive current component i R ;
(9)将步骤8所得到的阻性电流分量iR上传至主控芯片，通过主控芯片将数据传送至显示模块以及GPRS模块；(9) Upload the resistive current component i R obtained in step 8 to the main control chip, and transmit the data to the display module and the GPRS module through the main control chip;
(10)GPRS模块将步骤9所得到的数据传送至PC机。(10) The GPRS module transmits the data obtained in step 9 to the PC.
本发明的有益之处在于：本发明提供一种金属氧化物避雷器在线监测装置及其监测方法，可以实现对金属氧化物避雷器的在线实时监测，同时本发明的方法考虑了谐波电压对容性电流补偿法的影响，可以很好的减小由于谐波电压对阻性电流提取的干扰，提高了提取的准确性，从而减小由于谐波干扰造成的对金属氧化物避雷器实际情况的误判，装置结构原理简单，方法简单可行，在实际监测中具有很高的实用价值，节约成本，经济高效。The benefit of the present invention is that: the present invention provides a metal oxide arrester online monitoring device and its monitoring method, which can realize the online real-time monitoring of the metal oxide arrester. The influence of the current compensation method can well reduce the interference of the harmonic voltage on the extraction of the resistive current, improve the accuracy of the extraction, thereby reducing the misjudgment of the actual situation of the metal oxide arrester caused by the harmonic interference , the device structure principle is simple, the method is simple and feasible, has high practical value in actual monitoring, saves cost, and is economical and efficient.
附图说明Description of drawings
图1为本发明一种实施例的结构示意图；Fig. 1 is a structural representation of an embodiment of the present invention;
图2为本发明后台算法处理模块一种实施例的示意图；Fig. 2 is a schematic diagram of an embodiment of the background algorithm processing module of the present invention;
图3为本发明一种实施例的等效模型图；Fig. 3 is an equivalent model diagram of an embodiment of the present invention;
图4为本发明提取阻性电流与实际阻性电流对比效果图；Fig. 4 is the comparison effect diagram of resistive current extracted by the present invention and actual resistive current;
具体实施方式Detailed ways
以下结合附图和具体实施例对本发明作具体的介绍。The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.
一种金属氧化物避雷器在线监测装置，包括：主控芯片，采集泄漏电流信号和电压信号的数据采集模块，接收数据采集模块的数据并计算出阻性电流传送到主控芯片的后台算法处理模块，交互连接于主控芯片的人机交互组件；数据采集模块包括：用于测量金属氧化物避雷器两端的电压以及金属氧化物避雷器的泄漏电流的电压电流测量模块，接收电压电流测量模块的信号并进行滤波处理的滤波模块，接收滤波模块的信号并进行AD转换的AD转换模块。An online monitoring device for metal oxide arresters, including: a main control chip, a data acquisition module for collecting leakage current signals and voltage signals, a background algorithm processing module that receives data from the data acquisition module and calculates the resistive current and transmits it to the main control chip , a human-computer interaction component interactively connected to the main control chip; the data acquisition module includes: a voltage and current measurement module for measuring the voltage at both ends of the metal oxide arrester and the leakage current of the metal oxide arrester, receiving the signal from the voltage and current measurement module and A filter module for filter processing, and an AD conversion module for receiving signals from the filter module and performing AD conversion.
人机交互组件组成有：连接于主控芯片的GPRS模块，连接于GPRS模块的PC机，连接于PC机的显示模块。The human-computer interaction component consists of: a GPRS module connected to the main control chip, a PC connected to the GPRS module, and a display module connected to the PC.
后台算法处理模块包括：电压信号读取模块，用于对电压信号进行90°移相的移相器，接收并检测移相器传递来的电压信号的波形检测器，用于对读取的电压信号进行FFT分析的FFT模块，泄漏电流读取模块，连接于电压信号读取模块、泄漏电流读取模块的过零检测器，连接于FFT模块和过零检测器并计算出晶介电容值C和电容补偿系数G的G、C计算模块，连接于波形检测器和G、C计算模块的乘法器，连接于乘法器和泄漏电流读取模块的减法器。后台算法处理模块的运行步骤是：先通过电压电流读取模块读取主控芯片中的电压以及泄漏电流，再通过FFT模块对读取的电压信号进行FFT分析，再通过过零检测器对读取的电压、泄漏电流进行过零检测得到的ix(t0)、w、u1、u3，G、C模块用得到的ix(t0)、w、u1、u3计算晶介电容值C、电容补偿系数G；移相器对电压信号进行90°移相，波形检测器检测移相后的电压信号，使用乘法器将移相后的电压与G相乘；使用减法器将泄漏电流与移相器所得结果相减，从而得到阻性电流。The background algorithm processing module includes: a voltage signal reading module, a phase shifter for 90° phase shifting of the voltage signal, a waveform detector for receiving and detecting the voltage signal transmitted by the phase shifter, and a waveform detector for reading the voltage The FFT module for FFT analysis of the signal, the leakage current reading module, the zero-crossing detector connected to the voltage signal reading module and the leakage current reading module, connected to the FFT module and the zero-crossing detector to calculate the crystal capacitance value C and The G and C calculation modules of the capacitance compensation coefficient G are connected to the waveform detector and the multiplier of the G and C calculation modules, and are connected to the multiplier and the subtractor of the leakage current reading module. The operation steps of the background algorithm processing module are: first read the voltage and leakage current in the main control chip through the voltage and current reading module, then perform FFT analysis on the read voltage signal through the FFT module, and then use the zero-crossing detector to read ix (t 0 ), w, u 1 , u 3 obtained by the zero-crossing detection of the voltage and leakage current, the G and C modules use the obtained ix (t 0 ), w, u 1 , u 3 to calculate the interphase Capacitance value C, capacitance compensation coefficient G; the phase shifter performs a 90° phase shift on the voltage signal, the waveform detector detects the phase-shifted voltage signal, and the multiplier multiplies the phase-shifted voltage by G; The leakage current is subtracted from the result obtained by the phase shifter to obtain the resistive current.
本发明的方法考虑了谐波电压对容性电流补偿法的影响，可以很好的减小由于谐波电压对阻性电流提取的干扰，提高了提取的准确性，从而减小由于谐波干扰造成的对金属氧化物避雷器实际情况的误判；金属氧化物避雷器在线监测装置的监测方法包括如下步骤：The method of the present invention considers the influence of the harmonic voltage on the capacitive current compensation method, can well reduce the interference of the harmonic voltage on the extraction of the resistive current, improves the accuracy of the extraction, thereby reducing the interference caused by the harmonic interference The misjudgment of the actual situation of the metal oxide arrester caused; the monitoring method of the online monitoring device of the metal oxide arrester includes the following steps:
(1)获取金属氧化物避雷器的初始电压u以及初始泄漏电流ix；(1) Obtain the initial voltage u and initial leakage current i x of the metal oxide arrester;
(2)将初始电压信号进行FFT分析，得到基波电压幅值u1、3次谐波电压幅值u3以及频率w；(2) Perform FFT analysis on the initial voltage signal to obtain fundamental voltage amplitude u 1 , third harmonic voltage amplitude u 3 and frequency w;
(3)将初始电压和初始泄漏电流通过过零检测器，找到初始电压为零时刻对应的泄漏电流ix(t0)；(3) pass the initial voltage and the initial leakage current through the zero-crossing detector, and find the leakage current i x (t 0 ) corresponding to the moment when the initial voltage is zero;
(4)将步骤2、3所得到的基波电压幅值u1、3次谐波电压幅值u3、频率w、泄漏电流ix(t0)带入式(1)得到晶介电容值C，(4) Put the fundamental voltage amplitude u 1 , third harmonic voltage amplitude u 3 , frequency w, and leakage current i x (t 0 ) obtained in steps 2 and 3 into formula (1) to obtain the dielectric capacitance C,
(5)将步骤2、4所得到的基波电压幅值u1、3次谐波电压幅值u3、频率w、晶介电容值C带入式(2)得到电容补偿系数G，(5) Put the fundamental voltage amplitude u 1 , third harmonic voltage amplitude u 3 , frequency w, and dielectric capacitance C obtained in steps 2 and 4 into formula (2) to obtain the capacitance compensation coefficient G,
(6)将初始电压信号通过移相器逆时针移相90°，通过波形检测得到移相后的电压usf；(6) The initial voltage signal is shifted counterclockwise by 90° through the phase shifter, and the phase-shifted voltage u sf is obtained through waveform detection;
(7)将步骤5、6所得到的电容补偿系数G、电压usf通过乘法器相乘；(7) the capacitance compensation coefficient G obtained in steps 5 and 6, the voltage u sf are multiplied by a multiplier;
(8)将步骤1所获取的初始泄漏电流ix以及步骤7所得到的结果通过减法器相减，得到阻性电流分量iR；(8) Subtract the initial leakage current i x obtained in step 1 and the result obtained in step 7 through a subtractor to obtain the resistive current component i R ;
(9)将步骤8所得到的阻性电流分量iR上传至主控芯片，通过主控芯片将数据传送至显示模块以及GPRS模块；(9) Upload the resistive current component i R obtained in step 8 to the main control chip, and transmit the data to the display module and the GPRS module through the main control chip;
(10)GPRS模块将步骤9所得到的数据传送至PC机。(10) The GPRS module transmits the data obtained in step 9 to the PC.
需要说明的是：金属氧化物避雷器在线监测装置的监测方法中的公式(1)(2)的推导过程为：金属氧化物避雷器在正常工作时，流过避雷器内部的工频电流非常小，避雷器处于小电流区。在小电流区，MOA模型可以简化地等效为如图3所述的由电容与非线性电阻并联的模型。图3中，ix为避雷器初始泄漏电流，iR为非线性电阻产生的阻性电流，ic为电容产生容性电流，u为避雷器两端的电压。避雷器初始泄漏电流ix为阻性电流iR与容性电流ic之和。It should be noted that the derivation process of the formula (1) (2) in the monitoring method of the metal oxide arrester on-line monitoring device is: when the metal oxide arrester is in normal operation, the power frequency current flowing through the arrester is very small, and the arrester in the low current region. In the small current region, the MOA model can be simplified and equivalent to a model in which a capacitor and a nonlinear resistor are connected in parallel as shown in Figure 3 . In Figure 3 , ix is the initial leakage current of the arrester, i R is the resistive current generated by the nonlinear resistor, ic is the capacitive current generated by the capacitor, and u is the voltage across the arrester. The initial leakage current ix of the arrester is the sum of the resistive current i R and the capacitive current ic .
经典的容性电流补偿法原理是将初始泄漏电流ix中的容性电流分量ic补偿掉，从而的到阻性电流iR，其原理可以用式(3)表示：The principle of the classic capacitive current compensation method is to compensate the capacitive current component ic in the initial leakage current ix, so as to obtain the resistive current i R , the principle can be expressed by formula ( 3 ):
当容性电流补偿掉时，ix-Gusf即为阻性电流，可得When the capacitive current is compensated, ix -Gu sf is the resistive current, which can be obtained
iR＝ix-Gusf (4)i R ＝i x -Gu sf (4)
设电网中含有3次谐波电压，作用在MOA上的电压可以表示为：Assuming that the power grid contains 3rd harmonic voltage, the voltage acting on the MOA can be expressed as:
u＝u1sin(wt)+u3sin(3wt) (5)u＝u 1 sin(wt)+u 3 sin(3wt) (5)
u1和u3分别为基波和3次谐波的幅值。u 1 and u 3 are the amplitudes of the fundamental wave and the third harmonic, respectively.
容性电流为：The capacitive current is:
阻性电流为：The resistive current is:
iR＝IR1sin wt+IR3sin 3wt (7)i R ＝I R1 sin wt+I R3 sin 3wt (7)
IR1和IR3分别为MOA阻性电流的基波电流和3次谐波电流幅值。I R1 and I R3 are the fundamental current and the third harmonic current amplitude of the MOA resistive current, respectively.
将(5)、(6)、(7)代入(3)式，可以求得补偿系数G为：Substituting (5), (6), and (7) into formula (3), the compensation coefficient G can be obtained as:
此时，由式(4)可得到谐波电压下的阻性电流值，At this time, the resistive current value under the harmonic voltage can be obtained from formula (4),
将式(9)与式(7)相比较，可以知道在电网电压加入谐波后，电网中的谐波电压会对阻性电流产生影响，考虑了谐波电压的补偿系数G如式(8)所示可以看出不仅与基波电压有关还和电压频率以及3次谐波电压幅值相关。Comparing Equation (9) with Equation (7), we can know that after adding harmonics to the grid voltage, the harmonic voltage in the grid will have an impact on the resistive current, and the compensation coefficient G considering the harmonic voltage is as shown in Equation (8 ) shows that it is not only related to the fundamental voltage but also related to the voltage frequency and the third harmonic voltage amplitude.
当在避雷器两端的电压过零时，流过避雷器的阻性电流iR为零，此时流过避雷器的全电流ix与金属氧化物避雷器阀片的容性电流分量相等。在含有3次谐波的电压时，全电流ix可以表示为：When the voltage across the arrester crosses zero, the resistive current i R flowing through the arrester is zero, and the full current i x flowing through the arrester is equal to the capacitive current component of the valve plate of the metal oxide arrester. When the voltage contains the 3rd harmonic, the full current ix can be expressed as:
设在t0时刻，加载在金属氧化物避雷两端的电网电压瞬时值为零，此时可以电压可由下式表示：Assuming that at time t0, the instantaneous value of the grid voltage loaded on both ends of the metal oxide lightning protection is zero, the voltage at this time can be expressed by the following formula:
u(t0)＝u1 sin wt0+u3 sin 3wt0＝0 (11)u(t 0 )=u 1 sin wt 0 +u 3 sin 3wt 0 ＝0 (11)
进一步地可以得到在电压过零情况下金属氧化物避雷的全电流ix(t0)的值：Further, the value of the full current ix ( t 0 ) of the metal oxide lightning protection can be obtained in the case of voltage zero crossing:
ix(t0)＝iR(t0)+wC(u1 cos wt0+3u3 cos 3wt0) (12)i x (t 0 )=i R (t 0 )+wC(u 1 cos wt 0 +3u 3 cos 3wt 0 ) (12)
根据电压过零时的特点，由式(12)可以得到电压过零情况下金属氧化物避雷器阀片上的晶介电容值：According to the characteristics when the voltage crosses zero, the dielectric capacitance value on the valve plate of the metal oxide arrester can be obtained from formula (12) when the voltage crosses zero:
由于MOA阀片的晶介电容可以近似的认为不变，因此可以认为式(13)所得的电容值即为MOA的晶介电容值。Since the dielectric capacitance of the MOA valve can be approximately considered constant, it can be considered that the capacitance value obtained by formula (13) is the crystal dielectric capacitance of the MOA.
将式(13)带入(8)式中可以得到含有电压谐波下的补偿系数 Bringing formula (13) into formula (8) can get the compensation coefficient with voltage harmonics
并利用式(4)求得谐波电压下的阻性电流值。And use the formula (4) to obtain the resistive current value under the harmonic voltage.
使用本发明所用的方法所得到的阻性电流和实际阻性电流的效果对比图如图4所示。图4显示，本发明所提取的阻性电流与金属氧化物避雷器的实际阻性电流有很好的一致性，说明本方法可以很好地实现对金属氧化物避雷器的在线监测。通过分析图4可以得到，金属氧化物避雷器的全电流以及阻性电流数值较为稳定，波形具有周期性和对称性，符合MOA的实际运行情况。图4中的实际阻性电流与本文方法提取的阻性电流波形图大部分区域较为一致，在电流过零时刻本文提取的电流波形有较小的抖动，可能是由于电网电压中含有少量的高次谐波以及金属氧化物避雷器自身的非线性原件产生的自身内部谐波的影响，本发明为简化计算忽略了数量较小的电网高次谐波的影响，但总的阻性曲线一致性较高，满足了实际监测过程的需要。The effect comparison between the resistive current obtained by using the method used in the present invention and the actual resistive current is shown in FIG. 4 . Fig. 4 shows that the resistive current extracted by the present invention is in good agreement with the actual resistive current of the metal oxide arrester, indicating that the method can well realize online monitoring of the metal oxide arrester. By analyzing Figure 4, it can be obtained that the full current and resistive current values of the metal oxide arrester are relatively stable, and the waveform is periodic and symmetrical, which is in line with the actual operation of the MOA. The actual resistive current in Figure 4 is consistent with most areas of the resistive current waveform extracted by the method in this paper. The current waveform extracted in this paper has a small jitter at the moment when the current crosses zero, which may be due to a small amount of high voltage in the grid voltage. harmonics and the influence of internal harmonics produced by the nonlinear components of the metal oxide arrester itself, the present invention ignores the influence of a small number of high-order harmonics of the power grid in order to simplify the calculation, but the consistency of the overall resistive curve is relatively High, which meets the needs of the actual monitoring process.
本发明提供一种金属氧化物避雷器在线监测装置及其监测方法，可以实现对金属氧化物避雷器的在线实时监测，同时本发明的方法考虑了谐波电压对容性电流补偿法的影响，可以很好的减小由于谐波电压对阻性电流提取的干扰，提高了提取的准确性，从而减小由于谐波干扰造成的对金属氧化物避雷器实际情况的误判，装置结构原理简单，方法简单可行，在实际监测中具有很高的实用价值，节约成本，经济高效。The invention provides an on-line monitoring device for metal oxide arresters and a monitoring method thereof, which can realize online real-time monitoring of metal oxide arresters. At the same time, the method of the invention takes into account the influence of harmonic voltage on the capacitive current compensation method, and can be easily It can reduce the interference of the harmonic voltage on the extraction of resistive current, improve the accuracy of extraction, thereby reducing the misjudgment of the actual situation of the metal oxide arrester caused by harmonic interference, the device structure principle is simple, and the method is simple It is feasible, has high practical value in actual monitoring, saves cost, and is economical and efficient.
以上显示和描述了本发明的基本原理、主要特征和优点。本行业的技术人员应该了解，上述实施例不以任何形式限制本发明，凡采用等同替换或等效变换的方式所获得的技术方案，均落在本发明的保护范围内。The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the above-mentioned embodiments do not limit the present invention in any form, and all technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.
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