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针对XLPE电缆绝缘监测中低频叠加法电源参数对检测精度的影响问题,研究了XLPE电缆绝缘故障检测精度、选择性与低频叠加电源参数之间的关系,综合考虑低频叠加法电源幅值和频率2个因素进行实验分析。结果表明,在一定频率下,随着叠加电源幅值的降低,阻性电流成分增大,绝缘检测精度相应提高;在一定电压下,随着叠加电源频率的降低,电缆绝缘检测精度逐渐升高,低频叠加法对电缆故障的选择性越好。
In view of the influence of power parameters of medium and low frequency superposition method on the detection accuracy of XLPE cable insulation monitoring, the relationship between the accuracy and selectivity of XLPE cable insulation fault detection and the parameters of low frequency superposition power supply was studied. The power amplitude and frequency of low frequency superposition method Factors for experimental analysis. The results show that at certain frequency, with the decrease of the amplitude of the superimposed power supply, the resistive current component increases and the insulation detection accuracy increases accordingly. With the decrease of the superimposed power supply frequency, the accuracy of cable insulation detection gradually increases , Low-frequency superposition of the better cable fault selectivity.