Quantitative Analysis of Rogowski CT Frequency Characteristics

Abstract:

Partial discharges in power cables will generate small currents with low frequencies in the ground cords. In cable PD online monitoring systems, CTs are usually used to obtain such PD signals. In this paper, by derivations based on theories of wave propagation, the frequency characteristics of Rogowski CTs (RCTs) and the effects of transformer parameters (size, core material, etc.) on its pass band B, sensitivity H(jω₀), the lower cutoff frequency f_L is acquired. The feasibility of such derivations is verified by experiments. By conducting comparative experiments, the effect of the use of screening box and the way of coil winding on the performance of a current transformer is acquired. A feasible plan to improve the frequency characteristics of CTs is presented, in order to acquire more stable gain and better anti-interference ability within their pass band.

• Periodical: Advanced Materials Research (Volumes 860-863)
• Pages: 2168-2176
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.860-863.2168
• Online since: December 2013
• Authors: Zong Jie Liu, Xiao Xin Chen*, Fang Yuan Jin, Ling Ming Kong, Chong Feng Tian, Chang Zheng Liu
• Keywords: Partial Discharge (PD), Rogowski Current Transformer

References

[1] PCJM van der Wielen: On-line Detection and Location of Partial Discharges in Medium-Voltage Power Cables (Ph.D., Eindhoven University, Netherlands 2005).

[2] S. Grams: Journal of University of Defense Technology Vol. 26 (2000), p.3.

[3] C. Ma: High voltage electrical appliances Vol. 37 (2001), p.1.