Naval Ship Electrical Load, Power Margin & Generator Redundancy Tool
Estimate ship service electrical demand, online generator loading,
reserve margin, N+1 capability, largest-generator-loss exposure,
additional generation required and load shedding after a generator
casualty. Advanced mode models individual generators and prioritized
electrical loads.
User-entered planning thresholds. No universal naval design limits are assumed.
Electrical Load
Hotel, combat systems, cooling, auxiliaries and mission payloads
Power Margin
Online capacity, derating, reserve requirement and generator loading
Redundancy
N+1 screening, generator-loss margin and prioritized load shedding
Ship Electrical Demand
Enter coincident electrical demand for the operating condition being
evaluated. Do not enter connected load unless all connected loads are
expected to operate simultaneously.
kW
kW
kW
kW
kW
kW
kW
Evaluated separately as a peak-load condition.
Generator Configuration
units
units
kW
% rated
Apply project-specific environmental, maintenance or operating derating.
% of load
%
Casualty Load Priorities
Used only to estimate the amount of load that may need to be shed
after loss of one online generator.
% total load
% total load
Remaining load is treated as nonessential / first-to-shed for this economic-planning screen.
Individual Generators
Available capacity equals rated kW × entered derating. Only
generators marked Available can contribute to installed standby
capacity. Only Available + Online units contribute to current power.
Generator
Rated kW
Available %
Available
Online
Electrical Load Blocks
Priority is used for the post-casualty load-shedding estimate.
Nonessential loads are shed first, followed by mission loads.
Essential loads are retained last.
Load
Demand kW
Priority
Included
Power Margin & Redundancy Criteria
% of load
%
kW
Electrical Power & Redundancy Results
Identical-generator ship service analysis
Enter electrical data
Enter coincident ship electrical demand and generator capacity to
calculate power margin, loading, reserve and generator-loss exposure.
Normal Power Margin
N/A
Online derated capacity minus current electrical demand
N+1 Generator-Loss Margin
N/A
Remaining online capacity after loss of largest online generator
Current Electrical Demand
N/A
Peak / Surge Demand
N/A
Online Capacity
N/A
Online Generator Loading
N/A
Reserve Margin
N/A
Reserve Target
N/A
Largest Online Generator
N/A
Post-Loss Capacity
N/A
Load Shed Required
N/A
Installed Available Capacity
N/A
Standby Capacity
N/A
Peak Condition Margin
N/A
Electrical Load Breakdown
Included coincident demand
Generator Status
Advanced mode
Generator
Rated kW
Derated Capacity
Available
Online
Share of Online Load
Reserve & Redundancy Assessment
Generator Casualty Load-Shedding Screen
Power Margin Sensitivity
Electrical load vs generator derating
Load \ Capacity
-5%
Base
+5%
Model approach:
current demand is compared with derated online generator capacity.
Reserve margin equals online capacity minus current demand. Required
reserve capacity equals current demand × the entered reserve percentage.
N+1 screening removes the largest online generator and compares the
remaining capacity with the current load. The casualty load-shedding
estimate removes nonessential load first, then mission load, while
essential load is retained last. Advanced-mode generator load sharing
is modeled proportional to available generator capacity.
Planning estimate only.
This tool does not replace an approved electric load analysis, power
management system, protection-coordination study, dynamic stability
analysis, generator transient-load study, short-circuit analysis,
damage-control doctrine, load-shedding logic, class review or naval
authority requirements. Real shipboard electrical behavior depends on
generator transient response, starting currents, motor loads, pulsed
loads, harmonics, bus architecture, switchboard segmentation, converters,
energy storage, shaft generators, shore power, fault isolation, battle
damage, environmental conditions and system-specific operating limits.
Do not use this tool to establish actual casualty-control or blackout
recovery procedures.
