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Standards Development
This document describes technical measures to be carried out at crossings and parallelisms of buried metal pipelines influenced by HVDC systems.
It provides guidance on how the design, construction, operation, maintenance, and decommissioning phases of HVDC systems affect buried metal pipelines.
Electrical interference conditions (AC and DC) to pipeline systems are described, and acceptable levels of interference are discussed.
Minimum separation distances are recommended.
The following aspects are not covered in this document:
-Contractual responsibilities
-Personnel safety
HIGH Voltage Direct Current (HVDC) technology has progressed significantly in the last years in an attempt to widen the range and reliability of dc transmission links. These links include applications that are overhead, underground, submarine or a combination of these options. Two fundamental converter technologies facilitate the operation of modern HVDC transmission systems, namely the conventional line-commutated current source converters (CSCs) and self-commutated voltage source converters (VSCs), which may conform to back-to-back, monopolar, bipolar, homopolar (noncommutating) and multi-terminal systems. However, the technology of each system entails topologies and operating characteristics that affect the electrical interference situations and the effect on nearby critical infrastructures – for example on gas pipeline systems. Moreover, depending on the underlying technology, the operating characteristics of the HVDC systems can change under fault and maintenance conditions. This is because the technology of an HVDC scheme defines the current return operation (continuous or intermittent) under normal, emergency and dc fault conditions. An earth/seawater return path or a dedicated metallic return conductor between the converter stations can facilitate this current return process. Outage of any converter station/pole or a dc-side fault can result in high unbalanced or transient currents that may flow in the earth or in the metallic return conductors. Thus, when evaluating the interference activity from HVDC schemes multi-disciplinary expert knowledge is required: a) to understand the physical and engineering aspects of transmitting and controlling HVDC electrical power and b) the risks of an unacceptable electrochemical/corrosion impact on pipeline systems.
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