Are these Power Systems handwritten notes free?

Yes. Fill in the short form on this page and the PDF downloads right away. There is no fee for the notes.

Are these official university notes?

No. These are original Uncodemy revision notes for Power Systems. They are not issued or approved by AKTU or any other university, and they are not past papers.

Which syllabus do they follow?

They follow the common B.Tech syllabus for Power Systems used by most Indian universities, including AKTU and colleges on the AICTE model curriculum. Unit order and depth differ, so match the notes with your own university syllabus.

Do the notes cover both Power Systems I and II?

They include transmission and distribution topics as well as analysis topics such as faults, load flow and stability. Universities divide these between the two papers differently, so check your own syllabus.

Is load flow included?

Yes. The load flow unit covers bus types, Ybus formation and the Gauss-Seidel and Newton-Raphson methods.

Power Systems Handwritten Notes PDF

Key takeaways

Nine units covering both Power Systems I and II topics in most universities.
Load factor, string efficiency and per-unit base change are worked through with numbers.
Symmetrical fault MVA and current are solved for a 20 MVA, 11 kV generator.
Symmetrical components, Gauss-Seidel and Newton-Raphson load flow, the swing equation, equal area criterion and economic dispatch are covered.
Original Uncodemy revision notes, not official university notes. Check your own syllabus.

About these handwritten notes

These Power Systems notes are original Uncodemy revision notes, written in a clean handwritten style so they are quick to read before an exam. They follow the common B.Tech syllabus for Power Systems (B.Tech EE and EEE, and GATE EE basics). They are not official university notes and not copied from any textbook or past paper.

Topic order, unit numbers and depth vary between universities, so first place each unit below against your own university syllabus. If your syllabus has a topic that is missing here, add it in the margin from your class notes or textbook. Use these notes for revision after you have studied the topic once in class, not as your only study material. They are short on purpose: the aim is to help you recall the main ideas, formulas and diagrams quickly, so that your exam time goes into writing good answers.

What's inside the Power Systems notes

The notes start with generation and transmission basics and move to analysis topics such as faults, load flow and stability. Each unit has formula boxes and a solved numerical.

Unit 1: Power System Basics. Structure of a power system, load curves, load factor, demand factor and diversity factor.
Unit 2: Transmission Line Parameters. Resistance, inductance and capacitance of lines, transposition, skin effect and corona.
Unit 3: Performance of Transmission Lines. Short, medium and long lines, nominal T and π models, ABCD constants, regulation and the Ferranti effect.
Unit 4: Insulators and Cables. Types of insulators, voltage distribution and string efficiency, and underground cables.
Unit 5: Per-Unit System and Symmetrical Faults. Per-unit values, change of base, and three-phase fault MVA and current.
Unit 6: Symmetrical Components and Unsymmetrical Faults. Sequence components and networks, and L-G, L-L and L-L-G faults.
Unit 7: Load Flow Studies. Bus types, Ybus formation, and the Gauss-Seidel and Newton-Raphson methods.
Unit 8: Power System Stability. Steady state and transient stability, the swing equation and the equal area criterion.
Unit 9: Economic Dispatch, Frequency Control and HVDC. Equal incremental cost, load frequency control and HVDC basics.

The last page of the PDF lists the most asked practice questions for the whole subject, so you can test yourself after finishing all the units.

Formulas and solved examples in the PDF

Formula boxes cover load factor, line inductance and capacitance, ABCD constants, string efficiency, per-unit base change, fault MVA and current, the swing equation and the equal incremental cost rule. Solved examples include a load factor numerical, a 3-disc string with m = 0.1, a base change from 50 to 100 MVA, the fault current of a 20 MVA generator and a two-unit economic dispatch.

How to revise Power Systems with handwritten notes

Handwritten-style notes work best when you read actively. Keep a pen and a rough notebook beside you, cover the formula or diagram, and try to write it yourself before you look.

Write the per-unit base change formula on one card and solve two quick problems with it before every session.
Draw the sequence network connections for L-G, L-L and L-L-G faults on one page.
For load flow, keep the Gauss-Seidel update formula and the Newton-Raphson Jacobian structure side by side.
Sketch the power angle curve and shade the equal areas for one fault-clearing case.

In the last week, read only the formula boxes and exam tips, and solve one numerical or long question per unit from memory. If you study with friends, ask each other to explain one diagram or derivation aloud. Explaining a topic is the fastest way to find the gaps in it.

A short revision plan

If your exam is about a week away, this plan covers every unit in the PDF once and leaves time for practice. Stretch it over two weeks if you are starting from scratch.

Day 1: Power System Basics, Transmission Line Parameters.
Day 2: Performance of Transmission Lines, Insulators and Cables.
Day 3: Per-Unit System and Symmetrical Faults, Symmetrical Components and Unsymmetrical Faults.
Day 4: Load Flow Studies, Power System Stability.
Day 5: Economic Dispatch, Frequency Control and HVDC.
Day 6: Solve the practice questions in the exam focus section below, one per unit, without the notes.
Day 7: Read only the formula boxes and exam tips, redo the numericals you got wrong, and sleep early.

Common mistakes to avoid

Changing the MVA base but forgetting the kV base in the per-unit formula when the voltages differ.
Using line-to-line voltage instead of phase voltage in fault current calculations.
Forgetting the factor of 3 in L-G fault current: If = 3E/(Z1 + Z2 + Z0).
Writing AD - BC = 1 for a non-reciprocal network. It holds only for passive, reciprocal lines.

How Power Systems links to other subjects

Power Systems builds on Network Analysis, Electrical Machines and Electromagnetic Theory (for line parameters). It leads into Switchgear and Protection, power system operation and control, HVDC and FACTS electives.

Exam focus: high-weightage topics

University papers usually give the most weight to line parameters, ABCD constants, insulators and string efficiency, per-unit and fault calculations, symmetrical components, load flow and stability. GATE EE power systems marks come mostly from per-unit, fault MVA, symmetrical components, ABCD, the swing equation, equal area, Ybus and economic dispatch.

Typical long and numerical questions to practise:

Define load factor, diversity factor and demand factor, and solve a numerical.
Find ABCD constants of the nominal π and T models and explain the Ferranti effect.
Find the string efficiency of a 3-disc string and explain how it is improved.
Explain the per-unit system with a change of base example.
Derive the fault current for an L-G fault using symmetrical components.
Derive the swing equation and explain the equal area criterion.

When you write a long answer, start with a one-line definition, draw the diagram or circuit, write the derivation in clear steps and end with the final result and its unit. For numericals, write the formula first, then substitute, so you can still earn step marks if the arithmetic slips.

These are practice questions based on common syllabus topics. They are not verified past papers, and we do not claim any question will appear in your exam. For real previous papers, use your university's official archive.

Who these notes are for

These notes are for B.Tech EE and EEE students preparing for their Power Systems I and II semester exams, and for students revising GATE EE basics such as per-unit, fault MVA, symmetrical components and economic dispatch. They are also useful for students preparing for PSU and power utility interviews, where transmission and fault basics are standard questions.

Download Power Systems Handwritten Notes PDF