Robust Analog DC Isolator for Cathodic Protection Applications
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 12, Issue 3
Abstract
To provide cathodic protection (CP) for gas and oil underground pipelines, a direct current (DC) isolator is needed to isolate the main CP converter from the earth around the pipeline. The DC isolator, proposed in this paper, consists of four parts: a second-order low-pass active filter, voltage level shifter, pulse-width-modulation (PWM) controller, and a ground isolator. This converter is designed to accurately provide an isolated near-ground voltage as a control input of the main CP converter in harsh outdoor environments, which is its privilege in comparison with other solutions. The second-order low-pass active filter is designed to filter possible disturbances in the vicinity of the pipeline and reduce the loading effect of the permanent half-cell resistor. The voltage level shifter provides proper voltage range and increases the precision of the main CP converter. The PWM controller is used to provide alternating current (AC) voltage for ground isolator, and the ground isolator provides enough isolation from the dirty ground near the pipeline. Finally, a prototype is implemented and tested to verify the theoretical and simulation results.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 12 • Issue 3 • August 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jan 6, 2021
Accepted: Mar 26, 2021
Published online: Jun 10, 2021
Published in print: Aug 1, 2021
Discussion open until: Nov 10, 2021
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