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500kV气体绝缘变电站开关操作对智能组件电流互感器端口电磁骚扰的实测及分析

DOI: 10.13336/j.1003-6520.hve.2015.05.040, PP. 1709-1718

Keywords: 气体绝缘开关设备,开关操作,骚扰电压,汇控柜,智能组件,IEC,61000-4-18

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Abstract:

智能变电站多将保护和控制以及监测等电子设备下放到汇控柜内,由于距离电磁骚扰源更近,使得这些电子设备的电磁兼容问题更加突出。为此,运用自制的电磁瞬态测量系统,对某500kV气体绝缘变电站调试期间隔离开关和断路器操作在汇控柜电流互感器组件端口产生的骚扰电压进行了测量。测量结果显示,气体绝缘开关设备汇控柜内智能组件端口共模骚扰电压最大值为326.75V,差模骚扰电压最大值为189.84V。并分析比较了隔离开关操作、断路器合闸操作和断路器分闸-合闸-闸操作时端口骚扰电压的差异。断路器操作时端口骚扰电压有可观的幅值水平,尤其是断路器分闸-合闸-分闸操作时端口骚扰电压在幅值、微脉冲持续时间和上升沿上较隔离开关操作时有更为严重的情况出现。最后,研究了IEC61000-4-18阻尼振荡波试验标准与实测波形的对应情况。实测波形参数和标准波形参数略有差异,总体的对应情况较好。实测端口的电磁骚扰水平低于IEC61000-4-18标准的试验等级1。

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