Power system studies vary significantly on each design process depending on the purpose of the project. It would be better to have a complete study on your project rather than having missed one or two when audited. Several power system studies may be combined into single report if having a single stand alone document is not essential. The most commonly used studies are:
- Cable Ampacity
Calculates the ampacity or operating temperature of cables.
- Voltage Drop
Calculates the system voltage levels and the impact of a motor starting.
- Protective Device Coordination
Plots the time-current curve at specified values for each protective device applied on the power system. Prints a one-line diagram of the associated portion of the system on the coordination curve for the plotted devices.
- Motor Starting Torque / Acceleration Time
Using motor and load inertia and torque values, calculates the motor voltage and torque values during the accelerating
period, and determines the overall starting time of a successful motor start.
- Earthing and Lightnining protection Study
Determines step and touch potentials and to identify hazard locations and provide design solutions.
- Transient Stability
Calculates the response of dynamic loads to various system disturbances and to determine any unstable operating conditions requiring load shedding or other corrective measures.
- Harmonic Analysis
Determine harmonic producing loads on a system and evaluate possible migitations, i.e. harmonic filters.
- Reliability / Availability
Determine failure rates and outage duration times for electrical equipment using statistical data to evaluate if redundant systems are necessary.
- Fault Analysis
Calculates fault duties at every system bus to identify and select devices short-circuit capability.
- Load Flow
Calculates the system steady-state conditions for both dynamic and static loads, and investigates various operating modes.
- Lighting Design
Determines th e correct illumination levels for each task or area.
- Generator Sizing
Using data for equipment availability to determine the size of generator for prime or standby power requirement.
There might be some other studies that I have missed but I am confident that I have listed most of it.