Switchgear and Protection (Diploma)

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

6 महीनेअवधि 6Chapters34टॉपिक

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01Unit 1: Faults and Short Circuit Calculations 6 टॉपिक

Need of switchgear and protection
Types of faults: symmetrical and unsymmetrical
Causes and effects of faults
Per-unit system and change of base
Symmetrical fault calculations and fault MVA
Current limiting reactors and their location

02Unit 2: Circuit Breakers 7 टॉपिक

Arc formation and arc interruption theories
Restriking voltage, recovery voltage and RRRV
Current chopping and resistance switching
Air break and air blast circuit breakers
Bulk oil and minimum oil circuit breakers
SF6 and vacuum circuit breakers
Ratings of circuit breakers

03Unit 3: Fuses and LT Switchgear 5 टॉपिक

Fuse terms: rated current, fusing factor, prospective current, cut-off
Rewirable and HRC fuses
Isolators and switch fuse units
MCB, MCCB and their trip characteristics
ELCB / RCCB and earth leakage protection

04Unit 4: Protective Relays 6 टॉपिक

Requirements of protective relays
Electromagnetic attraction and induction relays
Overcurrent relays: IDMT, PSM and TMS
Directional and distance relays (impedance, reactance, mho)
Differential relays
Static and numerical relays

05Unit 5: Protection of Alternators, Transformers, Motors and Lines 5 टॉपिक

Alternator protection: Merz-Price, stator earth fault, loss of excitation
Transformer protection: differential, Buchholz relay, REF
Induction motor protection
Busbar protection
Feeder and transmission line protection

06Unit 6: Protection against Overvoltages and Earthing 5 टॉपिक

Causes of overvoltages, lightning phenomena
Ground wire and lightning arresters (rod gap, expulsion, metal oxide)
Insulation coordination basics
Neutral earthing: solid, resistance, reactance and Peterson coil
Equipment and substation earthing

परिचय

आप यह कर पाएँगे

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

यह किसके लिए है

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

आपको क्या चाहिए

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

सवाल

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.