Products tagged with 'inductive'

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10108 AC Corrosion and Cathodic Protection of Buried Pipelines

Product Number: 51300-10108-SG

ISBN: 10108 2010 CP

Author: Lucio Di Biase, Ranieri Cigna, and Osvaldo Fumei

Publication Date: 2010

$20.00

The State of the Art in the technical/scientific knowledge of the subject of AC corrosion on cathodically protected pipelines. Its mitigation, the studies and the issue of relevant Standards & Recommendations will also be dealt with.

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The Effect of Inductive Loading on Rectifier Interruption

Product Number: 51320-14621-SG

Author: Michael M. Dockery, Stephen B. Gibson

Publication Date: 2020

$20.00

Direct current (DC) sources are a critical component of many cathodic protection (CP) systems. In order to assess the performance of these CP systems, momentary interruption of the DC current output is often utilized to help obtain true polarized potentials of protected structures1. This is achieved with a relay that is either integral to the DC current source or installed externally. Traditionally, these relays use a mechanical or mercury contactor, but solid-state relays are becoming more popular for their increased performance and reduced environmental footprint. Recent experience has indicated that interruption of current with an inductive load can damage solid state relays by momentarily exceeding their voltage rating. This has been observed by some CP technicians when they return to site to check on a previously installed interrupter, only to find it overheated and not interrupting. This study will examine the various sources of inductance in impressed current CP systems and discuss methods for mitigating the inductive effects during interruption. To demonstrate the effectiveness of these methods, an electrical circuit was created to mimic a cathodic protection circuit, and the effectiveness during interruption was measured using an oscilloscope.

Products tagged with 'inductive'

10108 AC Corrosion and Cathodic Protection of Buried Pipelines

The Effect of Inductive Loading on Rectifier Interruption

Association for Materials Protection and Performance