CN101430349A - Novel method for measuring resistive current of gapless metal-oxide lighting arrester - Google Patents

Novel method for measuring resistive current of gapless metal-oxide lighting arrester Download PDF

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CN101430349A
CN101430349A CNA2008102294451A CN200810229445A CN101430349A CN 101430349 A CN101430349 A CN 101430349A CN A2008102294451 A CNA2008102294451 A CN A2008102294451A CN 200810229445 A CN200810229445 A CN 200810229445A CN 101430349 A CN101430349 A CN 101430349A
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voltage
metal oxide
resistive current
oxide arrester
gapless metal
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CN101430349B (en
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颜文
钟雅风
韩洪刚
于存湛
陈瑞国
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Liaoning Electric Power Testing Technology Co Ltd
Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
Liaoning Dongke Electric Power Co Ltd
State Grid Corp of China SGCC
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Liaoning Electric Power Testing Technology Co Ltd
Northeast Electric Power Research Institute Co Ltd
Liaoning Dongke Electric Power Co Ltd
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Abstract

本发明涉及一种不取PT(CVT)信号又能检测无间隙金属氧化物避雷器阻性电流的方法。其特征是把运行现场的无间隙金属氧化物避雷器的高压带电体看作是电容分压器高压臂的上电极，以一个可随意放置的活动探头作为高压臂的下电极，用电缆把活动探头与一个放大器连接，放大器内有电容分压器的低压臂和放大电路，从运行现场取一个感应电压Ug，和B相电流Ib，可测到Ib与Ug的夹角φbg；通过φB＝φb－φbg就得到了虚拟的Ub；根据系统三相电压相差120°，就可造出虚拟的Ua、Uc，这样就完成对三相MOA阻性电流的测量。本发明的目的在于解决上面提到的三种情况下如何测量MOA的阻性电流这方面所存在的问题。

The invention relates to a method for detecting the resistive current of a gapless metal oxide arrester without taking a PT (CVT) signal. It is characterized in that the high-voltage charged body of the gapless metal oxide arrester at the operation site is regarded as the upper electrode of the high-voltage arm of the capacitor voltage divider, and a movable probe that can be placed at will is used as the lower electrode of the high-voltage arm, and the movable probe is connected with a cable. Connect with an amplifier, which has a low-voltage arm of a capacitive voltage divider and an amplifying circuit, take an induced voltage U g from the operating site, and B-phase current I b , and measure the angle φ bg between I b and U g ; The virtual U b can be obtained by φ B = φ b - φ bg ; according to the 120° difference of the three-phase voltage of the system, the virtual U a and U c can be created, thus completing the measurement of the three-phase MOA resistive current . The purpose of the present invention is to solve the problems of how to measure the resistive current of the MOA in the three cases mentioned above.

Description

一种测量无间隙金属氧化物避雷器阻性电流的新方法 A New Method for Measuring the Resistive Current of Gapless Metal Oxide Surge Arresters

一、技术领域：本发明涉及一种不取PT(CVT)信号又能检测无间隙金属氧化物避雷器阻性电流的方法。One, technical field: the present invention relates to a kind of method that does not get PT (CVT) signal and can detect the resistive current of gapless metal oxide arrester.

二、背景技术：用RCD-4型阻性电流测量仪测量运行中无间隙金属氧化物避雷器(简称MOA)的阻性电流，不但要取被测相MOA的总电流，还要取被测相的电压，该电压一般从PT(电磁式电压互感器)或CVT(电容式电压互感器)取得，这是人们公认的方法。然而以下三种情况，第一种架空线和电缆联接处都装有MOA(从500kV、330kV、220kV、110kV等电压等级都有)，而MOA的安装处无电压互感器(PT或CVT)，无法取到比较电压信号；第二种情况是许多GIS的MOA处也没有电压互感器；第三种情况，在220kV、110kV的变电所内也不安装PT。运行中的MOA会受到各种过电压的作用，还长期受到电力系统正常运行电压的作用，有些MOA的密封可能失效，以上三种原因都会使MOA的性能劣化，劣化的主要标志之一，就是流过MOA的阻性电流增大。随着电力系统的发展，以上三种情况的MOA也越来越多，这些MOA阻性电流同样需要测量。为此，必须找到不取PT(CVT)信号时，测量MOA的阻性电流的途径。2. Background technology: use the RCD-4 resistive current measuring instrument to measure the resistive current of the non-gap metal oxide arrester (referred to as MOA) in operation, not only the total current of the measured phase MOA, but also the measured phase The voltage, which is generally obtained from PT (electromagnetic voltage transformer) or CVT (capacitive voltage transformer), is a recognized method. However, in the following three situations, the first type of overhead line and cable connection is equipped with MOA (from 500kV, 330kV, 220kV, 110kV and other voltage levels), and there is no voltage transformer (PT or CVT) at the installation of MOA. The comparison voltage signal cannot be obtained; the second case is that there are no voltage transformers at the MOA of many GIS; the third case is that PTs are not installed in the 220kV and 110kV substations. The MOA in operation will be affected by various overvoltages, and it will also be affected by the normal operating voltage of the power system for a long time. Some MOA seals may fail. The above three reasons will cause the performance of MOA to deteriorate. One of the main signs of deterioration is The resistive current flowing through the MOA increases. With the development of the power system, there are more and more MOAs in the above three situations, and these MOA resistive currents also need to be measured. For this reason, it is necessary to find a way to measure the resistive current of MOA when the PT (CVT) signal is not taken.

三、发明内容： 3. Contents of the invention:

1、发明目的：本发明提供一种不取PT(CVT)信号又能检测无间隙金属氧化物避雷器阻性电流的新方法，其目的在于解决上面提到的三种情况下如何测量MOA的阻性电流这方面所存在的问题。1, purpose of the invention: the present invention provides a kind of new method that does not get PT (CVT) signal and can detect the resistive current of gapless metal oxide arrester, and its purpose is to solve how to measure the resistance of MOA under three kinds of situations mentioned above Problems with sex currents.

2、技术方案：本发明是通过以下技术方案来实现的：2. Technical solution: the present invention is achieved through the following technical solutions:

一种测量无间隙金属氧化物避雷器阻性电流的新方法，其特征在于：把运行现场的无间隙金属氧化物避雷器的高压带电体看作是电容分压器高压臂的上电极，以一个可随意放置的活动探头作为高压臂的下电极，用电缆把活动探头与一个放大器连接，放大器内有电容分压器的低压臂和放大电路，从运行现场取一个感应电压Ug，当系统是稳定的，现场无大风、无大雨，则Ug是稳定的，被放大了的感应电压信号送到仪器中进行测量；A new method for measuring the resistive current of a gapless metal oxide arrester is characterized in that: the high-voltage electrified body of the gapless metal oxide arrester at the operating site is regarded as the upper electrode of the high voltage arm of the capacitor voltage divider, and a The freely placed movable probe is used as the lower electrode of the high-voltage arm, and the movable probe is connected to an amplifier with a cable. There is a low-voltage arm of a capacitor voltage divider and an amplifying circuit in the amplifier, and an induced voltage U g is taken from the operating site. When the system is stable If there is no strong wind or heavy rain on site, then U g is stable, and the amplified induced voltage signal is sent to the instrument for measurement;

取B相无间隙金属氧化物避雷器电流Ib，可测到Ib与Ug的夹角

Figure A200810229445D00041
Take the current I b of the phase B gapless metal oxide arrester, and the angle between I b and U g can be measured
Figure A200810229445D00041

Figure A200810229445D00042
Figure A200810229445D00042

Figure A200810229445D00043
是Ib与Ub的夹角，
Figure A200810229445D00044
是一个校正角，
Figure A200810229445D00045
就得到了虚拟的Ub；根据系统三相电压相差120°，就可造出虚拟的Ua、Uc，这样就完成对三相MOA阻性电流的测量。
Figure A200810229445D00043
is the angle between I b and U b ,
Figure A200810229445D00044
is a correction angle,
Figure A200810229445D00045
The virtual U b is obtained; according to the 120° difference between the three-phase voltages of the system, the virtual U a and U c can be created, thus completing the measurement of the three-phase MOA resistive current.

所述的高压带电体包括无间隙金属氧化物避雷器、电磁式电压互感器及高压引线。The high-voltage electrified body includes a gapless metal oxide arrester, an electromagnetic voltage transformer and a high-voltage lead wire.

所述的

Figure A200810229445D0004190821QIETU
值一般为八十度附近，或为实测值。said
Figure A200810229445D0004190821QIETU
The value is generally around eighty degrees, or the measured value.

采用交流220V电源来代替电磁式电压互感器或电容式电压互感器的电压信号，测量无间隙金属氧化物避雷器的阻性电流基波值。The AC 220V power supply is used to replace the voltage signal of the electromagnetic voltage transformer or capacitive voltage transformer, and the fundamental wave value of the resistive current of the gapless metal oxide arrester is measured.

3、优点及效果：通过从现场取感应电压信号或220v电源信号来测量运行中三相MOA的阻性电流，使得在无PT和既无PT又无220v电源的场合下，可以成功地开展运行中MOA的阻性电流的测量工作，都会有效地检测MOA的密封是否失效，其安全意义十分重大，社会效益显著。3. Advantages and effects: Measure the resistive current of the three-phase MOA in operation by taking the induced voltage signal or 220v power signal from the field, so that it can be successfully operated in the case of no PT and neither PT nor 220v power supply The measurement of the resistive current of the MOA in the middle will effectively detect whether the seal of the MOA is invalid. Its safety significance is very important and the social benefits are remarkable.

四、附图说明： 4. Description of drawings:

图1为本发明探头放大器连接关系示意图；Fig. 1 is the schematic diagram of connection relation of probe amplifier of the present invention;

图2为本发明电流电压矢量图。Fig. 2 is the current-voltage vector diagram of the present invention.

五、具体实施方式： 5. Specific implementation methods:

本发明是用RCD-4型阻性电流测量仪原测量原理的基础上，采用探头法-感应电压法可以正确测量运行中三相MOA的阻性电流。使在既无PT又无220v电源的场合下，可以成功地开展运行中MOA的阻性电流的测量工作。The invention is based on the original measurement principle of the RCD-4 resistive current measuring instrument, and can correctly measure the resistive current of the three-phase MOA in operation by using the probe method-induced voltage method. In the case of neither PT nor 220v power supply, the measurement of the resistive current of MOA in operation can be successfully carried out.

附图1为探头放大器工作图；图1中1为活动探头，2为放大电路，3为低压臂，4为仪器，5为高压带电体。附图2电流电压矢量图；图2中：Ug为感应电压；Ub为B相MOA的电压；Ia、Ib、Ic为三相MOA总电流的基波；Φb为B相电压与B相电流之间的夹角；ΦB为感应电压与B相电流的夹角；Φbg为感应电压与B相电压的夹角。Accompanying drawing 1 is the working diagram of the probe amplifier; in Fig. 1, 1 is a movable probe, 2 is an amplifying circuit, 3 is a low-voltage arm, 4 is an instrument, and 5 is a high-voltage electrified body. Attached drawing 2 is the current and voltage vector diagram; in Figure 2: U g is the induced voltage; U b is the voltage of the B-phase MOA; I a , I b , and I c are the fundamental waves of the total current of the three-phase MOA; Φ b is the B-phase The angle between the voltage and the B-phase current; Φ B is the angle between the induced voltage and the B-phase current; Φ bg is the angle between the induced voltage and the B-phase voltage.

从运行现场取一个感应电压，把运行现场的高压带电体(包括MOA、PT及高压引线)看作是电容分压器高压臂的上电极，一个特制的可随意放置的活动探头作为高压臂的下电极，用电缆把活动探头与一个专用放大器连接，放大器内有电容分压器的低压臂和放大电路，被放大了的感应电压信号送到仪器，如附图1所示。Take an induced voltage from the operating site, regard the high-voltage live body (including MOA, PT and high-voltage leads) at the operating site as the upper electrode of the high-voltage arm of the capacitor voltage divider, and a special movable probe that can be placed at will as the high-voltage arm For the lower electrode, use a cable to connect the active probe to a dedicated amplifier. There is a low-voltage arm of a capacitive voltage divider and an amplifying circuit in the amplifier, and the amplified induced voltage signal is sent to the instrument, as shown in Figure 1.

附图1中感应电压Ug不代表任何一相电压，由于活动探头是随意放置的，Ug矢量的指向也可能总是不同的，附图2中的Ug是任意画的。当系统是稳定的，现场无大风、无大雨，则Ug是稳定的。The induced voltage Ug in the accompanying drawing 1 does not represent any phase voltage. Since the movable probe is placed randomly, the direction of the Ug vector may always be different. The Ug in the accompanying drawing 2 is drawn arbitrarily. When the system is stable and there is no strong wind or heavy rain on site, then U g is stable.

取B相MOA电流Ib，可测到Ib与Ug的夹角

Figure A200810229445D00051
Take the B-phase MOA current I b , the angle between I b and U g can be measured
Figure A200810229445D00051

Figure A200810229445D00052
Figure A200810229445D00052

Figure A200810229445D00053
是Ib与Ub的夹角(该值一般八十度左右，可以是实测值，也可设定一个值)，
Figure A200810229445D00054
是一个校正角，
Figure A200810229445D00055
就得到了虚拟的Ub；根据系统三相电压相差120°，就可造出虚拟的Ua、Uc，完成对三相MOA阻性电流的测量。
Figure A200810229445D00053
is the angle between I b and U b (the value is generally about 80 degrees, it can be a measured value or a value can be set),
Figure A200810229445D00054
is a correction angle,
Figure A200810229445D00055
The virtual U b is obtained; according to the 120° difference between the three-phase voltages of the system, the virtual U a and U c can be created to complete the measurement of the three-phase MOA resistive current.

此方法可解决线路MOA的阻性电流测量。This method addresses resistive current measurements of line MOAs.

另一种方法是交流220V电源法，使在无PT有交流220V电源的场合下，可以成功地开展运行中MOA的阻性电流的测量工作。具体方法是用交流220V电源来代替PT(CVT)电压信号，测量MOA的阻性电流基波值。其测试原理与探头法相同，只是用交流220V电源代替了PT的电压信号。Another method is the AC 220V power supply method, so that the measurement of the resistive current of the MOA in operation can be successfully carried out in the case of no PT and AC 220V power supply. The specific method is to replace the PT (CVT) voltage signal with an AC 220V power supply, and measure the fundamental wave value of the resistive current of the MOA. The test principle is the same as that of the probe method, except that the voltage signal of the PT is replaced by an AC 220V power supply.

Claims (4)

1、一种测量无间隙金属氧化物避雷器阻性电流的新方法，其特征在于：把运行现场的无间隙金属氧化物避雷器的高压带电体(5)看作是电容分压器高压臂的上电极，以一个可随意放置的活动探头(1)作为高压臂的下电极，用电缆把活动探头(1)与一个放大器连接，放大器内有电容分压器的低压臂(3)和放大电路(2)，从运行现场取一个感应电压Ug，当系统是稳定的，现场无大风、无大雨，则Ug是稳定的，被放大了的感应电压信号送到仪器(4)中进行测量；1. A new method for measuring the resistive current of a gapless metal oxide arrester, characterized in that: the high voltage electrified body (5) of the gapless metal oxide arrester at the operating site is regarded as the upper part of the high voltage arm of the capacitive voltage divider Electrode, with a movable probe (1) that can be placed freely as the lower electrode of the high-voltage arm, the movable probe (1) is connected with an amplifier with a cable, and the low-voltage arm (3) of the capacitor voltage divider and the amplifier circuit ( 2) Take an induced voltage U g from the operating site. When the system is stable and there is no strong wind or heavy rain on site, then U g is stable, and the amplified induced voltage signal is sent to the instrument (4) for measurement; 取B相无间隙金属氧化物避雷器电流Ib，可测到Ib与Ug的夹角
Figure A200810229445C0002175948QIETU
；Take the current I b of the phase B gapless metal oxide arrester, and the angle between I b and U g can be measured
Figure A200810229445C0002175948QIETU
;
Figure A200810229445C0002175958QIETU
Figure A200810229445C0002175958QIETU
Figure A200810229445C0002180008QIETU
b是Ib与Ub的夹角，
Figure A200810229445C0002180018QIETU
是一个校正角，
Figure A200810229445C0002180022QIETU
，就得到了虚拟的Ub；根据系统三相电压相差120°，就可造出虚拟的Ua、Uc，这样就完成对三相MOA阻性电流的测量。
Figure A200810229445C0002180008QIETU
b is the angle between I b and U b ,
Figure A200810229445C0002180018QIETU
is a correction angle,
Figure A200810229445C0002180022QIETU
, the virtual U b is obtained; according to the difference of 120° between the three-phase voltages of the system, the virtual U a and U c can be created, so as to complete the measurement of the three-phase MOA resistive current. 2、根据权利要求1所述的测量无间隙金属氧化物避雷器阻性电流的新方法，其特征在于：所述的高压带电体包括无间隙金属氧化物避雷器、电磁式电压互感器及高压引线。2. The new method for measuring the resistive current of a gapless metal oxide arrester according to claim 1, characterized in that: the high-voltage charged body includes a gapless metal oxide arrester, an electromagnetic voltage transformer and a high-voltage lead. 3、根据权利要求1所述的测量无间隙金属氧化物避雷器阻性电流的新方法，其特征在于：所述的b值一般为八十度附近，或为实测值。3. The new method for measuring the resistive current of a gapless metal oxide arrester according to claim 1, characterized in that: the The b value is generally around eighty degrees, or the measured value. 4、根据权利要求1所述的测量无间隙金属氧化物避雷器阻性电流的新方法，其特征在于：采用交流220V电源来代替电磁式电压互感器或电容式电压互感器的电压信号，测量无间隙金属氧化物避雷器的阻性电流基波值。4. The new method for measuring the resistive current of a gapless metal oxide arrester according to claim 1, characterized in that: an AC 220V power supply is used to replace the voltage signal of an electromagnetic voltage transformer or a capacitive voltage transformer, and the measurement without Fundamental wave value of resistive current of gap metal oxide surge arrester.
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CN102608392A (en) * 2012-03-22 2012-07-25 上海市电力公司 MOA (metal oxide arrester) resistive current detection system
CN102621457A (en) * 2012-03-13 2012-08-01 福建省电力有限公司莆田电业局 On-line detection method of metal oxide arrester insulating property influencing factor
CN102830319A (en) * 2012-09-18 2012-12-19 辽宁省电力有限公司电力科学研究院 Device and method for on-line inspection on insulation state of zinc oxide arrester
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CN104849530A (en) * 2015-05-19 2015-08-19 江苏理工学院 A method for measuring fundamental wave of MOA resistive current
CN104865438A (en) * 2015-06-15 2015-08-26 江苏理工学院 Method for measuring resistive current fundamental wave of zinc oxide arrester
CN106483360A (en) * 2015-08-26 2017-03-08 国网河南省电力公司检修公司 Method using 220V power supply on-line monitoring arrester resistance current
CN106597148A (en) * 2016-11-24 2017-04-26 云南电网有限责任公司电力科学研究院 Residual voltage monitoring based state monitoring system and method for lightning arrester without serial gap

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CN102621457A (en) * 2012-03-13 2012-08-01 福建省电力有限公司莆田电业局 On-line detection method of metal oxide arrester insulating property influencing factor
CN102621457B (en) * 2012-03-13 2013-12-25 国家电网公司 On-line detection method of metal oxide arrester insulating property influencing factor
CN102608392A (en) * 2012-03-22 2012-07-25 上海市电力公司 MOA (metal oxide arrester) resistive current detection system
CN102830319A (en) * 2012-09-18 2012-12-19 辽宁省电力有限公司电力科学研究院 Device and method for on-line inspection on insulation state of zinc oxide arrester
CN102830319B (en) * 2012-09-18 2016-02-24 辽宁省电力有限公司电力科学研究院 A kind of zinc oxide lightning arrester insulation state measuring device with electricity and method
CN103245896A (en) * 2013-04-24 2013-08-14 广州供电局有限公司 Distributing line lightning induction overvoltage simulation platform based on rocket triggered lightning technology
CN104122490A (en) * 2014-07-16 2014-10-29 国家电网公司 Transformer bushing insulation state online monitoring device and method
CN104849530A (en) * 2015-05-19 2015-08-19 江苏理工学院 A method for measuring fundamental wave of MOA resistive current
CN104865438A (en) * 2015-06-15 2015-08-26 江苏理工学院 Method for measuring resistive current fundamental wave of zinc oxide arrester
CN106483360A (en) * 2015-08-26 2017-03-08 国网河南省电力公司检修公司 Method using 220V power supply on-line monitoring arrester resistance current
CN106483360B (en) * 2015-08-26 2019-03-12 国网河南省电力公司检修公司 A Method of Online Monitoring MOA Resistive Current Using 220V Power Supply
CN106597148A (en) * 2016-11-24 2017-04-26 云南电网有限责任公司电力科学研究院 Residual voltage monitoring based state monitoring system and method for lightning arrester without serial gap

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