氧化锌避雷器抗相间、空间干扰带电测试技术研究.docxVIP

氧化锌避雷器抗相间、空间干扰带电测试技术研究 [摘要]目前，采用常规仪器在高电压等级变电站对避雷器进行阻性电流测试，常因测试时相间、空间干扰严重而得不到合理的测试值，导致无法准确判别避雷器运行状态。针对此问题，本课题提出对变电站内氧化锌避雷器及其周围导体进行三维建模，直接仿真计算氧化锌避雷器遭受的相间、空间干扰电流的幅值和相位，评估干扰源对氧化锌避雷器带电测试的影响大小，并在已有氧化锌避雷器带电检测技术应用成果的基础上，通过叠加原理，将此干扰电流滤除以得到氧化锌避雷器绝缘状态的真实信息，提高避雷器带电测试水平，为逐步开展的状态检修工作提供可靠的数据支撑。[关键词] 氧化锌避雷器；三维建模；仿真计算；相间空间干扰；幅值和相位Interphase and space interference electric testing technology research of the Zinc oxide lightning arrester [abstract] at present, the level of the conventional instrument in high voltage substations for lightning arrester current impedance test, test and white, severe space interference often can not get reasonable test values, accurately judging the running state of the arrester. Aiming at this problem, this topic proposed within the substation on zinc oxide lightning arrester and the surrounding the conductor for 3 d modeling, and the direct simulation of the zinc oxide lightning arrester to suffer, space interference current amplitude and phase, to assess the effect of interference sources of zinc oxide lightning arrester charged test size, and results in the existing zinc oxide lightning arrester charged detection technology application, on the basis of through the superposition principle, the interference current filter divided by zinc oxide lightning arrester insulation condition of real information, improve the level of lightning arrester charged test, to gradually develop the status of the repair work to provide reliable data to support.[key words] zinc oxide lightning arrester; 3 d modeling; The simulation calculation. Interphase and space interference; Amplitude and phase一、简介氧化锌避雷器因其优越的过电压保护特性而成为电力系统应用最多的主力保护设备，其故障可能会导致爆炸，影响系统安全、稳定运行，因此，其自身安全必须得到足够重视。目前，变电站内氧化锌避雷器绝缘性能的检测一般有停电试验和带电测试两种方法。停电试验，会降低设备运行的可靠性，同时还会增大电网运行风险，尤其是需要陪停电网主设备时，如变压器侧避雷器试验。有时甚至会因为运行方式的限制无法停运，导致避雷器无法按时预试，因此避雷器的带电测试显得尤为重要。带电测试时，通常测试的参量为全泄漏电流、阻性电流和功率损耗，其中阻性电流基波有效值反映被测氧化锌避雷器的污秽程度或受潮程度；阻性电流谐波有效值反映被测氧化锌避雷器的老化程度；功率损耗引起温升，反映被测氧化锌避雷器的劣化程度。在变电站现场进行带电测试时，由于站内设备排列密集，所有导体之间都存在耦合电容，故不可避免地存