www.sait-group.com
BSS Technologies
BSS Technologies
P.O. Box : 33464, Abu Dhabi, U.A.E.
Tel : 00971 2 446 0700
bsstech@bsstechnologies.com
Global Location
AC Mitigation Overview

Pipelines running into close proximity with electric power transmission and distribution systems will occur electromagnetic field created by the alternating current (AC) (expands and collapses and changes direction 120 times per second). An alternating electromagnetic field will exhibit an induced voltage on the pipeline.

Possible electrical effects on Pipeline:

Electrical Energy from an over head power line can be transferred to a pipeline by three possible electrical effects,

   •Capacitive Coupling (Or) Electrostatic Coupling
   •Inductive Coupling (Or) Electromagnetic Coupling
   •Resistive Coupling (Or) Conductive Coupling

Capacitive Coupling:

Any two materials separated by a dielectric material can be considered as a capacitor. Capacitance is the ability to store electrical charge between to conductors relative to the voltage between the conductors. In this case air is the dielectric and power line is one conductor while the pipeline is the other conductor.

This capacitive coupling is of most concern on above ground pipeline or such as during construction of pipeline.

 

                AC mitigation

Inductive Coupling:


Inductive (or) electromagnetic coupling where the pipeline is a conductor in an electrical field and thus induced voltage may build up beyond acceptable threshold limits.

In this case pipeline act as a secondary and overhead power lines are secondary. The induced voltage appears on the pipeline

 

                  AC mitigation

Resistive Coupling:


During power line faults to ground, large AC currents can be transmitted to the earth through resistive coupling and subsequently into nearby underground structures. These AC currents which can be several thousand amperes can cause physical damage to the structure coatings. These faults are occur infrequently and   are of short duration. 

                 AC mitigation

Need of Mitigation:


AC interference on the pipeline due to inductive, capacitive and resistive coupling between the power line and the pipeline produces the following risks:

    •Shock to personnel under normal (steady state) operation

    •Shock to personnel under fault conditions

    •Electrical arcing under fault conditions causing puncture or damage to pipeline

    •AC-enhanced corrosion under steady state operation

    •Damage to the coating due to electrical stress under fault condition



 

     
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