Skills

Power Systems Analysis

8 weeks · 0 milestones

Perform a power systems analysis for a defined electrical network — either a real distribution network (using public utility data) or a documented study network. The analysis must cover: a single-line diagram of the network with all bus voltages, line impedances, and load specifications, a load flow analysis calculating real and reactive power flows on all branches and bus voltages under normal operating conditions, a fault analysis calculating fault current for at least one three-phase bolted fault at a specified bus, and a protection coordination analysis identifying whether the existing protection devices (or proposed devices) will correctly isolate the fault. Preferred proof: analysis of a real utility or industrial distribution network using professional software. Accessible alternative: pandapower (Python library, free and open-source) or OpenDSS (free, from EPRI) applied to a published IEEE test network (IEEE 9-bus, 14-bus, or 30-bus systems — all publicly available). Hand calculation for a simplified 3-bus network is also accepted with documented methodology. Proof artifacts: the single-line diagram and network specification (design artifact) and the load flow and fault analysis results (analysis artifact). Verification: a power systems engineer reviews the fault analysis — 'at this fault level, does the upstream breaker clear within its rated interrupting time?' — requiring you to reason through your own protection coordination.

Part of: Engineering · Proves for: Engineers, UG

Milestone map

3 milestones

Define the Power System and Model Single-Line Diagram

1–2 weeks (3–4 hrs/week)

Choose a power system to analyse — a distribution network, industrial plant power system, or microgrid. Draw a single-line diagram (SLD) showing all generation sources, transformers, busbars, transmission lines, loads, and protection devices. Assign per-unit (p.u.) base values for the system. A correctly drawn SLD with consistent per-unit bases is the foundation for all subsequent load flow and fault analysis — errors at this stage cascade through every calculation.

Proof required

Submit your system definition: a drawn single-line diagram with all components labelled, per-unit base values stated (MVA base and kV base for each voltage level), and a component list table (generation, transformer, line, load ratings).

What gets checked

SLD labels all components with their ratings — transformer MVA/kV, line impedance, generator MVA, load MW/Mvar
Per-unit base values are stated for all voltage levels in the system (MVA base + kV base → impedance base for each level)
SLD is drawn (not copied from a textbook) with a consistent set of symbols

Common mistakes

Using inconsistent base values across voltage levels — per-unit impedances will be wrong if the kV base is not correctly transformed through each transformer
Omitting protection devices from the SLD — short-circuit analysis in M2 requires knowing where fuses, breakers, and relays are located

Powstik Guide

A labelled single-line diagram with per-unit bases.

Steps

Define the system boundary.
Draw every bus, line and transformer.
Label ratings on each component.
Choose base MVA and base voltages.

Template

Base MVA:
| Zone | Base kV | Base impedance |
|------|---------|----------------|
Components and ratings:

What gets sent back

Unlabelled components.
No per-unit bases.
Missing transformer zones.

Resources

Foundationstart here

Depthgo deeper

Masteryfor the dedicated

What a verifier looks for

Confirm SLD labels all components with their rated values — flag any component shown without a rating.
Confirm per-unit base values are stated for every voltage level — confirm kV base changes correctly at each transformer.
Confirm SLD is original (not copied from a textbook) — components should match the system selected.

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Perform Load Flow and Short-Circuit Analysis

3–4 weeks (4–5 hrs/week)

Perform a load flow (power flow) analysis to find bus voltages, real and reactive power flows, and transmission losses under normal operating conditions. Use Gauss-Seidel, Newton-Raphson, or a free simulation tool (PSCAD, pandapower, or PyPSA). Then perform a three-phase balanced fault (short-circuit) analysis at ≥2 buses to find fault current magnitudes and confirm protection device ratings are adequate. Both analyses are required — load flow shows normal operation; fault analysis governs protection design.

Proof required

Submit your analysis results: load flow bus voltage table and power flow summary, and fault current calculations at ≥2 buses showing method and per-unit impedance values used.

What gets checked

Load flow results show bus voltages within ±5% of nominal — state any buses that violate this and explain why
Fault current calculations show per-unit impedance values and base conversion — not just final kA results
Analysis covers both normal (load flow) and fault conditions — not one or the other

Common mistakes

Running a simulation without understanding what it calculates — verify one result by hand before trusting simulation outputs
Fault analysis at only one bus — at minimum analyse the highest-fault-current bus (usually closest to generation) and a remote bus

Resources

Foundationstart here

Depthgo deeper

What a verifier looks for

Confirm load flow results include bus voltage magnitudes and angles, plus real/reactive power flow on each line.
Confirm at least one result is verified by hand calculation or against a textbook example — not purely simulation output.
Confirm fault current calculations show per-unit impedance values and base conversion to physical kA.

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Assess Protection Coordination and Write the Analysis Report

3–4 weeks (2–3 hrs/week)

Using the fault current results from M2, check that protection devices (fuses, circuit breakers, relays) are correctly coordinated: the device closest to the fault operates first, and upstream devices operate only if the downstream device fails. Document the time-current characteristics of each device and the selectivity margins. Write a complete power systems analysis report and have it reviewed by an electrical engineer with power systems experience.

Proof required

Submit your protection coordination assessment (time-current characteristic plot for ≥2 protection devices showing selectivity) and power systems analysis report (≥2,000 words including SLD, load flow results, fault analysis, and protection coordination) plus review record.

What gets checked

Time-current characteristic plot shows ≥2 devices with selectivity margins labelled — not just a list of device ratings
Report covers all four sections: SLD, load flow, fault analysis, protection coordination
Reviewer has electrical engineering (power systems) background — peer review without domain expertise does not count

Common mistakes

Describing protection devices without drawing their time-current characteristics — selectivity can only be confirmed visually from the curves, not from ratings alone
Writing a report that presents only simulation outputs without interpretation — analysis means explaining what the results mean for the design

Resources

Depthgo deeper

What a verifier looks for

Engineering Design Triad check: M1–M3 together produce a design artifact (SLD with per-unit system), an analysis artifact (load flow + fault current calculations + protection coordination plot), and a documentation artifact (complete power systems analysis report + review record) — confirm all three types are present.
Confirm time-current characteristic plot shows ≥2 devices with selectivity margins — not just device ratings in a table.
Confirm load flow and fault analysis results are interpreted — not just simulation outputs pasted into a report.
Confirm reviewer has power systems electrical engineering experience — challenge questions must probe the load flow results and protection coordination logic.
The Proof Accessibility Rule applies — pandapower (free), PyPSA (free), PSCAD free educational version, MIT OCW (free), and Schneider free guides are all accessible without commercial licence.

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Part of

Electrical & Electronics Engineering →

Related outcomes

Milestone map

3 milestones

Define the Power System and Model Single-Line Diagram

1–2 weeks (3–4 hrs/week)

Proof required

What gets checked

SLD labels all components with their ratings — transformer MVA/kV, line impedance, generator MVA, load MW/Mvar
Per-unit base values are stated for all voltage levels in the system (MVA base + kV base → impedance base for each level)
SLD is drawn (not copied from a textbook) with a consistent set of symbols

Common mistakes

Using inconsistent base values across voltage levels — per-unit impedances will be wrong if the kV base is not correctly transformed through each transformer
Omitting protection devices from the SLD — short-circuit analysis in M2 requires knowing where fuses, breakers, and relays are located

Powstik Guide

A labelled single-line diagram with per-unit bases.

Steps

Define the system boundary.
Draw every bus, line and transformer.
Label ratings on each component.
Choose base MVA and base voltages.

Template

Base MVA:
| Zone | Base kV | Base impedance |
|------|---------|----------------|
Components and ratings:

What gets sent back

Unlabelled components.
No per-unit bases.
Missing transformer zones.

Resources

Foundationstart here

Depthgo deeper

Masteryfor the dedicated

What a verifier looks for

Confirm SLD labels all components with their rated values — flag any component shown without a rating.
Confirm per-unit base values are stated for every voltage level — confirm kV base changes correctly at each transformer.
Confirm SLD is original (not copied from a textbook) — components should match the system selected.

You'll sign in first, then come straight back here.

Perform Load Flow and Short-Circuit Analysis

3–4 weeks (4–5 hrs/week)

Proof required

Submit your analysis results: load flow bus voltage table and power flow summary, and fault current calculations at ≥2 buses showing method and per-unit impedance values used.

What gets checked

Load flow results show bus voltages within ±5% of nominal — state any buses that violate this and explain why
Fault current calculations show per-unit impedance values and base conversion — not just final kA results
Analysis covers both normal (load flow) and fault conditions — not one or the other

Common mistakes

Running a simulation without understanding what it calculates — verify one result by hand before trusting simulation outputs
Fault analysis at only one bus — at minimum analyse the highest-fault-current bus (usually closest to generation) and a remote bus

Resources

Foundationstart here

Depthgo deeper

What a verifier looks for

Confirm load flow results include bus voltage magnitudes and angles, plus real/reactive power flow on each line.
Confirm at least one result is verified by hand calculation or against a textbook example — not purely simulation output.
Confirm fault current calculations show per-unit impedance values and base conversion to physical kA.

You'll sign in first, then come straight back here.

Assess Protection Coordination and Write the Analysis Report

3–4 weeks (2–3 hrs/week)

Proof required

What gets checked

Time-current characteristic plot shows ≥2 devices with selectivity margins labelled — not just a list of device ratings
Report covers all four sections: SLD, load flow, fault analysis, protection coordination
Reviewer has electrical engineering (power systems) background — peer review without domain expertise does not count

Common mistakes

Describing protection devices without drawing their time-current characteristics — selectivity can only be confirmed visually from the curves, not from ratings alone
Writing a report that presents only simulation outputs without interpretation — analysis means explaining what the results mean for the design

Resources

Depthgo deeper

What a verifier looks for

Engineering Design Triad check: M1–M3 together produce a design artifact (SLD with per-unit system), an analysis artifact (load flow + fault current calculations + protection coordination plot), and a documentation artifact (complete power systems analysis report + review record) — confirm all three types are present.
Confirm time-current characteristic plot shows ≥2 devices with selectivity margins — not just device ratings in a table.
Confirm load flow and fault analysis results are interpreted — not just simulation outputs pasted into a report.
Confirm reviewer has power systems electrical engineering experience — challenge questions must probe the load flow results and protection coordination logic.
The Proof Accessibility Rule applies — pandapower (free), PyPSA (free), PSCAD free educational version, MIT OCW (free), and Schneider free guides are all accessible without commercial licence.

You'll sign in first, then come straight back here.