CN103207308B - The measuring method of arrester resistance current and capacity current transient value - Google Patents
The measuring method of arrester resistance current and capacity current transient value Download PDFInfo
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- 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
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Abstract
本发明公开了一种避雷器阻性电流和容性电流暂态值测量方法。本发明首先采集各采样时刻的三相避雷器接地引下线的泄漏电流采样值和A相避雷器高压侧电压采样值；利用傅里叶算法计算A相避雷器高压侧电压的基频电压的相角、基频电压的幅值、三次电压谐波的相角和三次电压谐波的幅值；考虑三次电压谐波和相间耦合电容的影响，计算获得三相金属氧化物避雷器的泄漏电流中的容性电流和阻性电流暂态值。本发明在数学模型上考虑了三次电压谐波和相间耦合电容的影响，实现了对三相避雷器泄漏电流中的阻性电流和容性电流暂态过程的精确测量，实现了对三相避雷器绝缘性能监测时间点缩短到各采样时刻，为发现避雷器绝缘性能动态变化情况、为快速制定避雷器检修方案提供可靠依据。
The invention discloses a method for measuring the transient value of resistive current and capacitive current of an arrester. The present invention first collects the leakage current sampling value of the three-phase arrester grounding down-conductor at each sampling moment and the voltage sampling value of the high-voltage side of the A-phase arrester; utilizes the Fourier algorithm to calculate the phase angle of the fundamental frequency voltage of the high-voltage side voltage of the A-phase arrester, The amplitude of the fundamental frequency voltage, the phase angle of the third voltage harmonic and the amplitude of the third voltage harmonic; considering the influence of the third voltage harmonic and the interphase coupling capacitance, the capacitance in the leakage current of the three-phase metal oxide arrester is calculated current and resistive current transients. The invention considers the influence of the third voltage harmonic and the interphase coupling capacitance on the mathematical model, realizes the accurate measurement of the resistive current and the capacitive current transient process in the leakage current of the three-phase arrester, and realizes the insulation of the three-phase arrester The performance monitoring time point is shortened to each sampling time, which provides a reliable basis for discovering the dynamic change of the insulation performance of the arrester and quickly formulating the maintenance plan of the arrester.
Description
技术领域technical field
本发明涉及电力设备保护领域，具体地说是涉及一种避雷器阻性电流和容性电流暂态值的测量方法。The invention relates to the field of electric equipment protection, in particular to a method for measuring the transient value of resistive current and capacitive current of an arrester.
背景技术Background technique
目前对避雷器泄露电流中的阻性电流和容性电流的测量方法主要包括基波法、三次谐波法、谐波分析法和电容电流补偿法，这几种方法监测准确性受相间耦合电容影响，谐波分析法由于计算量大，实用性差；基波法、三次谐波法和电容电流补偿法则需要利用一个周波数据窗计算阻性电流基频分量和电容电流基频分量，一个基频数据窗只能计算得到一个阻性电流和容性电流数值，无法做到对避雷器泄露电流中的阻性电流和容性电流的暂态全过程分析监测，实时性不强。At present, the measurement methods of resistive current and capacitive current in the leakage current of arrester mainly include fundamental wave method, third harmonic method, harmonic analysis method and capacitive current compensation method. The monitoring accuracy of these methods is affected by the coupling capacitance between phases. , the harmonic analysis method is poor in practicability due to the large amount of calculation; the fundamental wave method, the third harmonic method and the capacitive current compensation method need to use a cycle data window to calculate the fundamental frequency component of the resistive current and the fundamental frequency component of the capacitive current, and a fundamental frequency data The window can only calculate a resistive current and a capacitive current value, and it is impossible to analyze and monitor the entire transient process of the resistive current and capacitive current in the leakage current of the arrester, and the real-time performance is not strong.
发明内容Contents of the invention
本发明的目的在于克服已有技术存在的不足，提供一种计算量较小、实用性强、能够实现对避雷器泄漏电流中的阻性电流和容性电流进行暂态全过程分析监测的避雷器阻性电流和容性电流暂态值测量方法。The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a surge arrester with a small amount of calculation, strong practicability, and the ability to perform transient analysis and monitoring of the resistive current and capacitive current in the leakage current of the arrester. Method for measuring transient values of capacitive and capacitive currents.
本发明的目的是通过以下途径实现的：The purpose of the present invention is achieved by the following approach:
避雷器阻性电流和容性电流暂态值测量方法，其要点在于，包括如下步骤：The main point of the method for measuring the transient value of resistive current and capacitive current of arrester is that it includes the following steps:
（1）提供一种测量装置，其采集各采样时刻的A、B、C三相避雷器接地引下线的泄漏电流采样值和各采样时刻的A相避雷器高压侧电压采样值；(1) Provide a measuring device, which collects the leakage current sampling value of the grounding down-conductor of the A, B, and C three-phase arresters at each sampling time and the sampling value of the high-voltage side voltage of the A-phase arrester at each sampling time;
（2）测量装置根据其所获得的电量值计算t采样时刻A相避雷器泄漏电流中的阻性电流值iAr(t)：(2) The measuring device calculates the resistive current value iAr(t) in the leakage current of the A-phase arrester at the sampling time t according to the electric quantity obtained by it:
测量装置计算t采样时刻A相避雷器泄漏电流中的容性电流值iAc(t)：The measurement device calculates the capacitive current value i Ac (t) in the leakage current of the A-phase arrester at the sampling time t:
（3）测量装置计算t采样时刻B相避雷器泄漏电流中的阻性电流值iBr(t)：(3) The measuring device calculates the resistive current value i Br (t) in the leakage current of the B-phase arrester at the sampling time t:
测量装置计算t采样时刻B相避雷器泄漏电流中的容性电流值iBc(t)：The measurement device calculates the capacitive current value i Bc (t) in the leakage current of the B-phase arrester at the sampling time t:
（4）测量装置计算t采样时刻C相避雷器泄漏电流中的阻性电流值iCr(t)：(4) The measuring device calculates the resistive current value i Cr (t) in the leakage current of the C-phase arrester at the sampling time t:
测量装置计算t采样时刻C相避雷器泄漏电流中的容性电流值iCc(t)：The measurement device calculates the capacitive current value i Cc (t) in the leakage current of the C-phase arrester at the sampling time t:
其中，iA(t)、iB(t)、iC(t)分别为t采样时刻流经A、B、C相避雷器接地引下线的泄漏电流采样值；i0(t1)=iA(t1)+iB(t1)+iC(t1)；iA(t1)为t1采样时刻流经A相避雷器接地引下线的泄漏电流采样值；iA(t2)为t2采样时刻流经A相避雷器接地引下线的泄漏电流采样值；iB(t1)为t1采样时刻流经B相避雷器接地引下线的泄漏电流采样值；iC(t1)为t1采样时刻流经C相避雷器接地引下线的泄漏电流采样值；Among them, i A (t), i B (t), and i C (t) are the sampling values of the leakage current flowing through the grounding down conductor of the A, B, and C phase arresters at the sampling time t; i 0 (t 1 )= i A (t 1 )+i B (t 1 )+i C (t 1 ); i A (t 1 ) is the sampling value of the leakage current flowing through the grounding down conductor of phase A surge arrester at the sampling time of t 1 ; i A ( t 2 ) is the sampling value of the leakage current flowing through the grounding down conductor of the A-phase arrester at the sampling time t 2 ; i B (t 1 ) is the sampling value of the leakage current flowing through the grounding down conductor of the B-phase arrester at the sampling time t 1 ; i C (t 1 ) is the sampling value of the leakage current flowing through the grounding down conductor of the C-phase arrester at the sampling time of t 1 ;
t1为A相避雷器高压侧电压波形过零点的采样时刻且满足uA(t1-△t)<0和uA(t1+△t)>0；uA(t1-△t)、uA(t1+△t)分别为t1-△t、t1+△t采样时刻的A相避雷器高压侧电压采样值；θ1为A相避雷器高压侧电压的基频电压的相角；θ3为A相避雷器高压侧电压的三次谐波电压的相角；U1m为A相避雷器高压侧电压的基频电压的幅值；U3m为A相避雷器高压侧电压的三次谐波电压的幅值；t为采样时刻；t2为一个基波周期内A相避雷器高压侧电压任意过零点的采样时刻；ω为电力系统角频率；t 1 is the sampling moment of the zero-crossing point of the voltage waveform on the high-voltage side of the A-phase arrester and satisfies u A (t 1 -△ t )<0 and u A (t 1 +△ t )>0; u A (t 1 -△ t ) , u A (t 1 +△t) are the sampling values of the high-voltage side voltage of the A-phase arrester at the sampling time of t 1 -△t and t 1 +△t respectively; θ 1 is the phase of the fundamental frequency voltage of the high-voltage side voltage of the A-phase arrester angle; θ 3 is the phase angle of the third harmonic voltage of the high-voltage side voltage of the A-phase arrester; U 1m is the amplitude of the fundamental frequency voltage of the high-voltage side voltage of the A-phase arrester; U 3m is the third harmonic of the high-voltage side voltage of the A-phase arrester Voltage amplitude; t is the sampling time; t 2 is the sampling time of any zero-crossing point of the high-voltage side voltage of the A-phase arrester within a fundamental cycle; ω is the angular frequency of the power system;
（5）测量装置将其计算得到的A、B、C三相避雷器泄露电流中的阻性电流暂态值和容性电流暂态值进行存储。(5) The measuring device stores the transient value of resistive current and transient value of capacitive current in the leakage current of A, B, and C three-phase arresters calculated by it.
上述技术方案具有如下有益效果：The above technical scheme has the following beneficial effects:
本发明方法从数学模型上考虑了三次电压谐波和相间耦合电容的影响，实现了对三相避雷器泄漏电流中的阻性电流和容性电流暂态全过程的精确测量，实现了对三相避雷器绝缘性能的监测时间点缩短到各采样时刻，为发现避雷器绝缘性能动态变化情况、为快速制定避雷器检修方案提供可靠依据。The method of the invention considers the influence of the third voltage harmonic and the interphase coupling capacitance from the mathematical model, realizes the accurate measurement of the whole process of the resistive current and the capacitive current transient state in the leakage current of the three-phase arrester, and realizes the measurement of the three-phase The monitoring time point of the arrester's insulation performance is shortened to each sampling time, which provides a reliable basis for discovering the dynamic change of the arrester's insulation performance and for quickly formulating a repair plan for the arrester.
附图说明Description of drawings
图1是本发明实施例提供的一种避雷器阻性电流和容性电流暂态值测量方法的流程图。Fig. 1 is a flow chart of a method for measuring transient values of resistive current and capacitive current of an arrester provided by an embodiment of the present invention.
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚，下面结合附图对本发明实施方式做进一步地详细描述。In order to make the object, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
本发明实施例首先实时采集t采样时刻流经A、B、C三相避雷器接地引下线的A、B、C三相避雷器的泄漏电流iA(t)、iB(t)、iC(t)，实时采集t采样时刻A相避雷器高压侧电压uA(t)；其中，t为任意采样时刻。Embodiments of the present invention first collect in real time the leakage currents i A (t), i B (t), and i C of the A, B, and C three-phase arresters flowing through the grounding down conductors of the A, B, and C three-phase arresters at sampling time t (t), real-time acquisition of the voltage u A (t) of the high-voltage side of the A-phase arrester at the sampling time t; where, t is any sampling time.
利用傅里叶算法计算A相避雷器高压侧电压的基频电压的相角θ1和基频电压的幅值U1m，利用傅里叶算法计算A相避雷器高压侧电压的三次电压谐波的相角θ3和三次电压谐波的幅值U3m。Use the Fourier algorithm to calculate the phase angle θ 1 of the fundamental frequency voltage of the high-voltage side voltage of the A-phase arrester and the amplitude U 1m of the fundamental frequency voltage, and use the Fourier algorithm to calculate the phase angle of the third voltage harmonic of the high-voltage side voltage of the A-phase arrester Angle θ 3 and amplitude U 3m of the third voltage harmonic.
计算t采样时刻A相避雷器泄漏电流中的阻性电流值iAr(t)：Calculate the resistive current value i Ar (t) in the leakage current of phase A surge arrester at sampling time t:
计算t采样时刻A相避雷器泄漏电流中的容性电流值iAc(t)：Calculate the capacitive current value i Ac (t) in the leakage current of the A-phase arrester at sampling time t:
计算t采样时刻B相避雷器泄漏电流中的阻性电流值iBr(t)：Calculate the resistive current value i Br (t) in the leakage current of the B-phase arrester at sampling time t:
计算t采样时刻B相避雷器泄漏电流中的容性电流值iBc(t)：Calculate the capacitive current value i Bc (t) in the leakage current of the B-phase arrester at sampling time t:
计算t采样时刻C相避雷器泄漏电流中的阻性电流值iCr(t)：Calculate the resistive current value i Cr (t) in the leakage current of phase C arrester at sampling time t:
计算t采样时刻C相避雷器泄漏电流中的容性电流值iCc(t)：Calculate the capacitive current value i Cc (t) in the leakage current of the C-phase arrester at sampling time t:
其中，iA(t)、iB(t)、iC(t)分别为t采样时刻流经A、B、C相避雷器接地引下线的泄漏电流采样值；i0(t1)=iA(t1)+iB(t1)+iC(t1)；iA(t1)为t1采样时刻流经A相避雷器接地引下线的泄漏电流采样值；iA(t2)为t2采样时刻流经A相避雷器接地引下线的泄漏电流采样值；iB(t1)为t1采样时刻流经B相避雷器接地引下线的泄漏电流采样值；iC(t1)为t1采样时刻流经C相避雷器接地引下线的泄漏电流采样值；Among them, i A (t), i B (t), and i C (t) are the sampling values of the leakage current flowing through the grounding down conductor of the A, B, and C phase arresters at the sampling time t; i 0 (t 1 )= i A (t 1 )+i B (t 1 )+i C (t 1 ); i A (t 1 ) is the sampling value of the leakage current flowing through the grounding down conductor of phase A surge arrester at the sampling time of t 1 ; i A ( t 2 ) is the sampling value of the leakage current flowing through the grounding down conductor of the A-phase arrester at the sampling time t 2 ; i B (t 1 ) is the sampling value of the leakage current flowing through the grounding down conductor of the B-phase arrester at the sampling time t 1 ; i C (t 1 ) is the sampling value of the leakage current flowing through the grounding down conductor of the C-phase arrester at the sampling time of t 1 ;
t1为A相避雷器高压侧电压波形过零点的采样时刻且满足uA(t1-△t)<0和uA(t1+△t)>0；uA(t1-△t)、uA(t1+△t)分别为t1-△t、t1+△t采样时刻的A相避雷器高压侧电压采样值；θ1为A相避雷器高压侧电压的基频电压的相角；θ3为A相避雷器高压侧电压的三次谐波电压的相角；U1m为A相避雷器高压侧电压的基频电压的幅值；U3m为A相避雷器高压侧电压的三次谐波电压的幅值；t为采样时刻；t2为一个基波周期内A相避雷器高压侧电压任意过零点的采样时刻；ω为电力系统角频率。t 1 is the sampling moment of the zero-crossing point of the voltage waveform on the high-voltage side of the A-phase arrester and satisfies u A (t 1 -△t)<0 and u A (t 1 +△t)>0; u A (t 1 -△t) , u A (t 1 +△t) are the sampling values of the high-voltage side voltage of the A-phase arrester at the sampling time of t 1 -△t and t 1 +△t respectively; θ 1 is the phase of the fundamental frequency voltage of the high-voltage side voltage of the A-phase arrester angle; θ 3 is the phase angle of the third harmonic voltage of the high-voltage side voltage of the A-phase arrester; U 1m is the amplitude of the fundamental frequency voltage of the high-voltage side voltage of the A-phase arrester; U 3m is the third harmonic of the high-voltage side voltage of the A-phase arrester The amplitude of the voltage; t is the sampling time; t 2 is the sampling time of any zero-crossing point of the high-voltage side voltage of the A-phase surge arrester within a fundamental cycle; ω is the angular frequency of the power system.
本发明方法在数学模型上考虑了三次电压谐波和相间耦合电容的影响，实现了对三相避雷器泄漏电流中的阻性电流和容性电流暂态过程的精确测量，实现了对三相避雷器绝缘性能监测时间点缩短到各采样时刻，为发现避雷器绝缘性能动态变化情况、为快速制定避雷器检修方案提供可靠依据。The method of the invention considers the influence of the third voltage harmonic and the interphase coupling capacitance on the mathematical model, realizes the accurate measurement of the resistive current and the capacitive current transient process in the leakage current of the three-phase arrester, and realizes the measurement of the three-phase arrester The insulation performance monitoring time point is shortened to each sampling time, which provides a reliable basis for discovering the dynamic changes in the insulation performance of the arrester and quickly formulating the maintenance plan for the arrester.
以上所述仅为本发明的较佳具体实施例，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。The above descriptions are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto, any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention , should be covered within the protection scope of the present invention.
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| PCT/CN2014/073108 WO2014139381A1 (en) | 2013-03-13 | 2014-03-10 | Method for measuring transient values of resistive current and capacitive current of lightning arrester |
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| CN103207308B (en) * | 2013-03-13 | 2015-08-26 | 福建省电力有限公司 | The measuring method of arrester resistance current and capacity current transient value |
| CN105277780A (en) * | 2014-06-25 | 2016-01-27 | 国家电网公司 | Voltage zero-crossing point obtaining method and device |
| 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 |
| CN105785171A (en) * | 2016-03-07 | 2016-07-20 | 清华大学 | Method for determining aging state of ZnO voltage-sensitive resistor disc according to higher harmonic characteristic of leakage current |
| CN108919026B (en) * | 2018-05-28 | 2023-10-24 | 国网浙江乐清市供电有限公司 | Live detection method for leakage current of lightning arrester |
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| CN112578311A (en) * | 2020-12-01 | 2021-03-30 | 国网山东省电力公司电力科学研究院 | Lightning arrester leakage current detection device and method |
| CN112649669B (en) * | 2020-12-21 | 2022-03-04 | 保定腾远电力科技有限公司 | Lightning arrester live-line detection method based on primary phase angle measurement |
| CN115078938B (en) * | 2022-08-22 | 2023-01-03 | 广东电网有限责任公司佛山供电局 | Method and device for identifying insulating property of lightning arrester |
| CN115575856B (en) * | 2022-11-18 | 2023-03-07 | 国网四川省电力公司成都供电公司 | Online monitoring method and system for leakage current of lightning arrester in power transmission cable terminal field |
| CN118534364B (en) * | 2024-07-24 | 2024-10-15 | 中国电力科学研究院有限公司 | Method and device for calculating resistive current of lightning arrester |
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| JPH0251075A (en) * | 1988-08-12 | 1990-02-21 | Nissin Electric Co Ltd | Arrester monitoring apparatus |
| JPH11191477A (en) * | 1997-12-26 | 1999-07-13 | Mitsubishi Electric Corp | Leakage current detection device for arrester |
| JP2000275294A (en) * | 1999-03-25 | 2000-10-06 | Mitsubishi Electric Corp | Leakage current detecting device for zinc oxide lightning arrester |
| KR100498927B1 (en) * | 2003-07-04 | 2005-07-04 | 학교법인 인하학원 | Method and Device for measuring resistive leakage current by time-delay synthesis method in deciding the deterioration diagnosis of arrester |
| CN101359016A (en) * | 2007-07-31 | 2009-02-04 | 上海电气自动化设计研究所有限公司 | Method for detecting resistance leakage current of lightning arrester without voltage reference |
| CN101299062B (en) * | 2008-07-01 | 2012-08-22 | 国网武汉高压研究院 | Device for checking zinc oxide lightning arrester block property current tester |
| KR101086878B1 (en) * | 2009-08-20 | 2011-11-25 | 한국전기연구원 | Resistive leakage current detection method and apparatus thereof for nonlinear element lightning arrester using differential method |
| CN101986164B (en) * | 2010-09-20 | 2012-11-28 | 华北电力大学（保定） | Method for extracting resistive current of metal oxide arrester (MOA) |
| CN102043084B (en) * | 2010-12-06 | 2014-10-15 | 上海思盛信息科技事务所 | Method for detecting resistive current of lightning arrester |
| CN102854431B (en) * | 2011-07-01 | 2014-11-19 | 上海思盛信息科技事务所 | Method for online detecting leakage resistive current of lightning arrestor |
| CN102288804B (en) * | 2011-07-20 | 2014-07-30 | 南京世都科技有限公司 | Method for calculating resistive current of arrester based on orthogonal transformation |
| CN102680775B (en) * | 2012-06-04 | 2014-09-17 | 北京四方继保自动化股份有限公司 | Device and method for monitoring arrester resistance current by introducing unconventional potential transformer (PT) |
| CN103207308B (en) * | 2013-03-13 | 2015-08-26 | 福建省电力有限公司 | The measuring method of arrester resistance current and capacity current transient value |
-
2013
- 2013-03-13 CN CN201310079901.XA patent/CN103207308B/en active Active
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2014
- 2014-03-10 WO PCT/CN2014/073108 patent/WO2014139381A1/en active Application Filing
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| CN103207308A (en) | 2013-07-17 |
| WO2014139381A1 (en) | 2014-09-18 |
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