Marine Electrical Power Systems:
Electric Power Load Analysis (EPLA):
Transformer Capacity Sizing

Last Update: April 26, 2026

Essential Questions

Essential Question Level of Thinking
What is the procedure for determining transformer capacity?
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What are the trade-offs with respect to using a single three-phase transformer and using three single-phase transformers?
Understand
What options are available for addressing large transformer inrush currenty?
Understand
What other considerations are there for selecting the capacity of transformers?
Understand

Text Material

Transformer Capacity Sizing ... (docx)

Presentation Material

Transformer Capacity Sizing ... (pptx)

Images

Video Material

References

ABS MVR ABS Rules for Building and Classing Marine Vessels

46 CFR 111 Code of Federal Regulations -- Coast Guard, Department of Homeland Security, Electrical Engineering, Electrical Systems - General Requirements

IEEE Std 45.1 IEEE Recommended Practice for Electrical Installations on Shipboard--Design

DPC 310-1 Electric Power Load Analysis (EPLA) for Surface Ships

Dalton, Thomas, "Power Application Limitations of AC Shipboard Electric Plants for US Navy Ships," presented at ASNE TSS 2019, June 18-20, 2019, Washington DC.

Doerry, Norbert, "Shipboard Three-Phase Power Transformer Analysis," Version 1.0, December 10, 2022


(C) Copyright 2024, 2026 Norbert Doerry

This work by Norbert Doerry is licensed under CC BY 4.0

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