Prepare for the EE9306 Protection and Switchgear examination using previous year question papers, topic-wise analysis, important topics, revision planning and exam preparation strategies.
📚 Subject Details
| Subject Code | EE9306 |
|---|---|
| Subject Name | Protection and Switchgear |
| University | Anna University |
| Degree | B.E. Electrical and Electronics Engineering |
| Department | Electrical and Electronics Engineering |
| Regulation | Regulation 2004 |
| Semester | 5 |
| Question Papers Analysed | 1 |
📊 Topic Weightage Analysis
The following chart summarizes the topic recurrence identified from the available previous year question papers.
📊 EE9306 Topic Weightage
Based on 1 available previous year question papers, this analysis shows how frequently each topic appears.
Topic Recurrence Distribution
Note: Topic weightage represents the percentage of available question papers containing a topic. It does not represent the percentage of examination marks allocated to that topic.
⭐ Important Topics
Based on the analysis of 1 previous year question paper, the following topics deserve special attention.
-
Circuit Breakers and Arc Phenomenology
Covers critical concepts like restriking voltage, RRRV, recovery voltage, current chopping, and various breaker technologies (SF6, Vacuum, Minimum Oil, HVDC) which are central to switchgear engineering. -
Relay Schemes and Apparatus Protection
Includes essential apparatus protection and communication-assisted schemes like differential protection, pilot relaying, Buchholz relay, and carrier current protection. -
Relay Types and Settings
Fundamental for understanding numerical/static relay operations, comparators (amplitude and phase), and practical settings such as plug settings and pick-up values for overcurrent relays. -
Fundamentals of Protection Systems
Forms the theoretical backbone covering essential qualities of protective systems, earthing methods, protection zones, and causes of relay maloperation.
📅 5-Day Revision Plan
| Day | Topics | Revision Focus |
|---|---|---|
| Day 1 |
• Fundamentals of Protection Systems
|
Revise the essential qualities of protective schemes, earthing methods, definition of protection zones, and causes leading to relay maloperation. |
| Day 2 |
• Relay Types and Settings
|
Focus on overcurrent relay calculations involving plug settings and pick-up values, along with the working principles of attracted armature relays, static relays, and amplitude/phase comparators. |
| Day 3 |
• Relay Schemes and Apparatus Protection
|
Study differential protection, pilot relaying, specific apparatus protection using Buchholz relays, and carrier current protection schemes. |
| Day 4 |
• Circuit Breakers and Arc Phenomenology
|
Master transient recovery voltage (TRV), restriking voltage, rate of rise of restriking voltage (RRRV), current chopping phenomena, and HVDC circuit breakers. |
| Day 5 |
• Circuit Breakers and Arc Phenomenology
|
Review construction, working, and application details of SF6 Circuit Breakers, Vacuum Circuit Breakers, and Minimum Oil Circuit Breakers. |
📄 Previous Year Question Papers
Download the available EE9306 previous year question papers below.
| Exam | Regulation | Semester | File | Download |
|---|---|---|---|---|
| Nov/Dec 2013 | Regulation 2004 | 5 | Question Paper | Download |
⚡ Last Minute Revision Tips
- Memorize key formulas related to circuit breaker transients, including expressions for restriking voltage and RRRV.
- Be clear on relay setting calculations, particularly plug settings and pick-up values for overcurrent protection.
- Prepare neat block diagrams or construction sketches for SF6 and Vacuum circuit breakers, as well as the Buchholz relay.
- Understand the distinct operational differences between amplitude and phase comparators.
- Review standard definitions for essential protective system qualities such as selectivity, reliability, speed, and sensitivity.
📝 Exam Strategy
⏱️ Time Management
- Allocate time proportionally based on mark distribution, leaving adequate minutes at the end to review numerical calculations and circuit diagrams.
✍️ Answer Writing Tips
- Use clear subheadings for describing equipment construction, working principles, and phenomena like current chopping or arc extinction.
- State relevant formulas clearly before substituting values in relay setting or transient recovery voltage problems.
📐 Diagram Presentation
- Draw neat, labeled single-line diagrams or internal construction schematics for circuit breakers and protective relays (e.g., Buchholz relay setup).
⚠️ Common Mistakes to Avoid
- Do not confuse restriking voltage with recovery voltage.
- Avoid mixing up the operating principles of amplitude versus phase comparators.
- Ensure proper unit conversions when dealing with relay plug settings and pick-up calculations.
❓ Frequently Asked Questions
What are the core topics to focus on for Protection and Switchgear?
Focus heavily on circuit breaker transient phenomena (restriking voltage, RRRV, current chopping), different circuit breaker types (SF6, Vacuum), relay schemes (differential, pilot, carrier current), and relay setting calculations.
Are numerical problems frequently asked in this subject?
Yes, topics like overcurrent relay plug settings, pick-up values, and circuit breaker transient parameters often involve analytical or numerical evaluations.
How should I prepare for switchgear equipment descriptions?
Focus on the working principle, medium of arc extinction, constructional details, and advantages/disadvantages for SF6, vacuum, and minimum oil circuit breakers.
🎯 Final Preparation Advice
Use these previous year question papers to identify recurring concepts and prioritize your revision. Focus particularly on the important topics, practise numerical problems where applicable, and revise important diagrams and formulas before the examination.
Consistent practice and strategic revision can make your examination preparation more effective.
