| 避雷器在线监测的影响因素 |
| 添加时间：2017/5/23 16:01:19 浏览次数： |
| 避雷器在线监测的影响因素 Factors affecting the on-line monitoring of arrestor 在实际运行中，有些干扰因素会对MOA特征量的监测产生影响。主要有以下几个方面的干扰需要考虑。 In practice, some interference factors may affect the monitoring of MOA characteristics. There are several areas of concern that need to be considered. 1、电网谐波电压对金属氧化物避雷器在线监测的影响 The effect of the power grid harmonic voltage on the on-line monitoring of metal oxide arrester 在电网中，由于使用的各种各样的电力电子设备与日俱增，虽然有抑制谐波的各种措施，但不可避免地存在谐波电压。谐波电压加在MOA上，会使其总电流的谐波电流中也含有容性成分并且与阻性泄漏电流中的谐波成分混合。给从总电流中将阻性电流分离出来造成困难。 In power grid, the use of a variety of power electronic devices is growing, though there are all kinds of measures to restrain the harmonics, but inevitably exists harmonic voltage. The harmonics voltage is added to the MOA, which makes the harmonic current of the total current also contain a capacitive component and is mixed with the harmonic component of the imped-leakage current. It is difficult to isolate the current from the current. 2、相间干扰对金属氧化物避雷器在线监测的影响 Interphase interference affects the on-line monitoring of metal oxide arrestor 当三相MOA按一字行排列同事带电运行时，各相MOA之间存在杂散电容，通过相间杂散电容各相MOA之间就有了电气联系，即各相MOA不仅受到自身相电压的作用，同时还通过相间杂散电容而受到邻相电压的作用，他们之间的距离和电压等级决定了这种作用的大小。这使MOA底部泄漏电流与单独一相运行时相比会发生幅值和相位变化。 When three-phase earth-sized arrange colleagues live in the word line is running, the stray capacitance between each phase earth-sized, markings are scattered through phase capacitor is an electrical connection between earth-sized in that each phase earth-sized phase voltage not only by themselves, but also by phase markings bulk capacitance under the effect of phase voltage, the distance between them and the voltage level determines the size of this effect. This makes the leakage current at the bottom of the MOA and the phase changes relative to the individual phase. |
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