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How Do You Ensure = Reliable Load Sharing and Fault Coordination in a Critical Offshore Complex= ?

Here=E2=80= =99s how we supported the North Field Alpha (NFA) Complex=E2=80=94an offsho= re gas production facility near Qatar=E2=80=94in achieving safe, reliable p= ower distribution across its multi-platform network.

Operating offshore means an= y uncoordinated protection or generator overload can lead to cascading fail= ures, equipment damage, or even complete shutdowns. At NFA, two aging 15=E2= =80=AFMVA generators serves the complete network power system, supplying lo= ads across multiple 6.6=E2=80=AFkV and 440=E2=80=AFV switchboards distribut= ed over utility, living quarters, riser, and support platforms.

Challenge=E2=80=99s they faced:

> The existing generators (30+ year= s old) were limited to 75% capacity (9=E2=80=AFMW each) due to aging, requi= ring optimized load sharing
> The ne= twork had multiple 6.6/0.46=E2=80=AFkV transformers feeding dozens of MCCs= =E2=80=94each needing reliable coordination to prevent tripping
> Voltage profiles across switchboards had to stay within =C2=B15% even unde= r peak and contingency conditions
> Emergency diesel gene= rators needed validation for fault handling and selective isolation<= /p>
 

Solution

We conducted com= prehensive load flow and short circuit studies using ETAP 20.5, covering mu= ltiple real-world and emergency scenarios:

=E2=9C=94 Loa= d Flow Analysis: Simulated peak, off-peak, and N-1 scenarios to verify tran= sformer loading, bus voltage compliance, and power factor adherence.
= =E2=9C=94 Short Circuit Study: Evaluated fault currents under norm= al and contingency operations to confirm equipment withstand ratings.
=E2=9C=94 Protection Coordination: Assessed switchgear withstand = ratings and enabled selective tripping from 6.6kV to 440V MCCs
=E2=9C= =94 Emergency Scenarios: Verified backup power adequacy using dies= el generators (5830-G-01 and 5930-G-02), ensuring voltage stability and bus= support.

Solution

- Stable voltage= profiles: All buses-maintained voltages within 99%=E2=80=93104.5% under pe= ak and contingency loads.
- Safe loading: Generators and transformers op= erated within rated limits across all cases.
- Confirmed fault withstand= : Fault levels stayed well below switchgear ratings, validating the design= =E2=80=99s robustness.
- Power system resilience ensured even with one g= enerator offline, without risking blackout or overload.

For offshore platforms with a= ging infrastructure and complex load zones, verified load sharing and prote= ction studies aren=E2=80=99t just compliance=E2=80=94they=E2=80=99re essent= ial for uninterrupted production.

Are your fault levels calculated= =E2=80=94or just assumed?

For load flow and protection coordination = studies using ETAP, DIgSILENT, or PSCAD:
Contact Ajithkumar Gunasekaran<= br>ajith@powerprojectsindia.com
=E2=80=AA+91 90423 42912=E2=80=AC=E2=80= =AC=E2=80=AC
#offshoreengineering #loadflowanalysis #shortcircuitstudy #= etap #powerprojects

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