NDSS Academy

Switchgear and Protection (Diploma)

Faults, circuit breakers, fuses, relays and protection of machines, transformers and lines.

6 MonthsDuration 6Chapters34Topics
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Syllabus · पाठ्यक्रम

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01Unit 1: Faults and Short Circuit Calculations 6 topics
  1. Need of switchgear and protection
  2. Types of faults: symmetrical and unsymmetrical
  3. Causes and effects of faults
  4. Per-unit system and change of base
  5. Symmetrical fault calculations and fault MVA
  6. Current limiting reactors and their location
02Unit 2: Circuit Breakers 7 topics
  1. Arc formation and arc interruption theories
  2. Restriking voltage, recovery voltage and RRRV
  3. Current chopping and resistance switching
  4. Air break and air blast circuit breakers
  5. Bulk oil and minimum oil circuit breakers
  6. SF6 and vacuum circuit breakers
  7. Ratings of circuit breakers
03Unit 3: Fuses and LT Switchgear 5 topics
  1. Fuse terms: rated current, fusing factor, prospective current, cut-off
  2. Rewirable and HRC fuses
  3. Isolators and switch fuse units
  4. MCB, MCCB and their trip characteristics
  5. ELCB / RCCB and earth leakage protection
04Unit 4: Protective Relays 6 topics
  1. Requirements of protective relays
  2. Electromagnetic attraction and induction relays
  3. Overcurrent relays: IDMT, PSM and TMS
  4. Directional and distance relays (impedance, reactance, mho)
  5. Differential relays
  6. Static and numerical relays
05Unit 5: Protection of Alternators, Transformers, Motors and Lines 5 topics
  1. Alternator protection: Merz-Price, stator earth fault, loss of excitation
  2. Transformer protection: differential, Buchholz relay, REF
  3. Induction motor protection
  4. Busbar protection
  5. Feeder and transmission line protection
06Unit 6: Protection against Overvoltages and Earthing 5 topics
  1. Causes of overvoltages, lightning phenomena
  2. Ground wire and lightning arresters (rod gap, expulsion, metal oxide)
  3. Insulation coordination basics
  4. Neutral earthing: solid, resistance, reactance and Peterson coil
  5. Equipment and substation earthing

About

You will be able to

  • Classify power system faults and calculate symmetrical fault current and fault MVA using the per-unit method
  • Explain arc formation, arc interruption, restriking voltage and RRRV in circuit breakers
  • Compare air, oil, SF6 and vacuum circuit breakers and select one for a given voltage level
  • Select fuses, MCB, MCCB and RCCB for LT installations
  • Explain the working of overcurrent, distance and differential relays and calculate PSM and operating time
  • Describe protection schemes for alternators, transformers, motors, busbars and feeders
  • Explain lightning arresters, neutral earthing and protection against overvoltages

Who it is for

  • Diploma Electrical Engineering students of Semester 5 (BTEUP)
  • Polytechnic students of other boards studying the same subject who want unit-wise coaching

What you need

  • Electrical Machines, Electrical Power Transmission and Distribution of earlier semesters
  • Basic AC circuit and per-unit calculations

Questions

Which syllabus does the Switchgear and Protection course follow?

It follows the BTEUP (Board of Technical Education, Uttar Pradesh) diploma syllabus for Switchgear and Protection (Electrical Engineering, Semester 5). If your own board's or institute's syllabus differs, the centre follows your own syllabus.

Will this help in the semester examination?

Yes. Teaching is unit-wise as per the BTEUP scheme, with previous-year question practice, MCQ tests and doubt sessions before the semester exam.

Are numericals covered?

Yes. Fault MVA, per-unit change of base, restriking voltage, PSM / TMS and relay time calculations are practised unit-wise.

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