Oscillatory wave cable partial discharge (PD) test is a new method for cable defects detecting. The quality of the PD signal collected is closely related to the impedance detection. The traditional RC-type detection impedance cannot take into account the energy of PD pulse detected and its attenuation effect on low frequency test voltage. In order to improve the performance of the detection impedance, a kind of π-type detection impedance for oscillatory wave cable PD test is presented. Theoretical analysis and experimental results show that the π-type detection impedance has a better attenuation effect on low frequency test voltage while keeping a high output pulse energy. In addition, there is a good linear relationship between the input and output signals. In the application of cable PD location under oscillating wave, this detection impedance can be used to detect the PD signal and its reflected waves effectively, and to locate the cable fault accurately. Therefore, the π-type detection impedance has broad application prospects in the PD test for high-voltage and long-distance cables.
KEY WORDS :detection impedance;partial discharge;oscillation wave;power cable;π-type;PD location;
图9
低频正弦波信号输入下π型与RC型检测阻抗的系统输出幅值衰减对比
Fig.9
Output signal amplitude attenuation of π-type and RC-type detection impedance circuits under low frequency sine wave signal input
图10
实测π型检测阻抗输出脉冲高度与输入方波幅值的关系
Fig.10
Relationship between the output pulse amplitude of π-type detection impedance circuit and the input square wave amplitude
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