Sequence Impedance Measurement for Underground Power Cables

Sequence impedance of a transmission line is a critical parameter in power transmission and distribution (T&D) system design, which is widely utilized in protection coordination. The sequence impedance for underground power cables is required by the protection engineers during the protection des...

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Bibliographic Details
Main Authors: Guo, Jim Jun, Hampton, Nigel, Baferani, Mohamadreza Arab
Format: Conference Proceeding
Language:English
Subjects:
Impedance measurement
Lead
line impedance
Measurement uncertainty
power cables
Power measurement
Protection
sequence impedance
transmission and distribution
Transmission line measurements
Uncertainty
Underground power cables
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Summary:Sequence impedance of a transmission line is a critical parameter in power transmission and distribution (T&D) system design, which is widely utilized in protection coordination. The sequence impedance for underground power cables is required by the protection engineers during the protection design and after the installation (commissioning). The calculated sequence impedance may contain large errors up to 50%, due to the uncertainties in the earth impedance, cable layout, etc. Therefore, the field measurement of sequence impedance of underground power cables is commonly required by the end-users. The measurement methods and the practical challenges are discussed in this paper. The testing lead effect, which is the main uncertainty in measuring short power cables, is discussed with a case study. A method to determine the testing lead effect through measurements is proposed.
ISSN:2576-6791
DOI:10.1109/EIC55835.2023.10177312