EE8602 Protection and Switchgear (PSG)
Prepared by
S.Santhosh (Admin)
Important questions
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UNIT -1
1.Essential qualities in protection**
FAUlts (types,nature,cAUSE)**
FAUlts (types,nature,cAUSE)**
2.Need and different types of earthing
3. Calculating fault current using symmetrical components
UNIT-2 (torque equations for this unit is most important for all relay so kindly read all equations)
1.Directional over current relay
1.Directional over current relay
2.Electromagnetic Relay,unIVERSAL RELAY**
3.Distance Relay
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*After exam there will some practical sessions on WhatsApp ...message us on WHATSAPP and enrich your knowledge and grow up your carrier*
Don't share it as screenshot
*After exam there will some practical sessions on WhatsApp ...message us on WHATSAPP and enrich your knowledge and grow up your carrier*
UNIT-3
1.Protection scheme of
1.Numerical protection full topic (Numerical relay,numerical overcurrent protection and numerical transformer differential protection)
1.Protection scheme of
(a)A.C Induction motor
(b)Transformer (Buchholtz relay)
2.CT,PT
UNIT-4 1.Numerical protection full topic (Numerical relay,numerical overcurrent protection and numerical transformer differential protection)
UNIT-5
1.Current chopping,Interruption of capacitive current
2.RRRV,oil,SF6,
Airblast CB
1.Current chopping,Interruption of capacitive current
2.RRRV,oil,SF6,
Airblast CB
**Very important questions are bolded and may be asked based on this topic
PART-C
1.Compulsory Questions {a case study where the student will have to read and analyse the subject }
mostly asked from unit 5(OR) a situation given and you have to answer on your own
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*These questions are expected for the exams This may or may not be asked for exams All the best.... from admin Santhosh
Thanks for your love and support guys keep supporting and share let the Engineers know about Us and leave a comment below for better improvements If there is any doubt feel free to ask me I will clear if I can or-else I will say some solutions ..get me through WhatsApp for instant updates ~$tuff$£ctorSYllabuS
Contact uS
*These questions are expected for the exams This may or may not be asked for exams
All the best.... from admin Santhosh
Thanks for your love and support guys keep supporting and share let the Engineers know about Us and leave a comment below for better improvements
If there is any doubt feel free to ask me I will clear if I can or-else I will say some solutions ..get me through WhatsApp for instant updates ~$tuff$£ctorUNIT I PROTECTION SCHEMES
Principles and need for protective schemes – nature and causes of faults – types of faults – Methods
of Grounding - Zones of protection and essential qualities of protection – Protection scheme
UNIT II ELECTROMAGNETIC RELAYS
Operating principles of relays - the Universal relay – Torque equation – R-X diagram – Electromagnetic Relays – Over current, Directional, Distance, Differential, Negative sequence and
Under frequency relays. UNIT III APPARATUS PROTECTION
Current transformers and Potential transformers and their applications in protection schemes - Protection of transformer, generator, motor, bus bars and transmission line.
UNIT IV STATIC RELAYS AND NUMERICAL PROTECTION
Static relays – Phase, Amplitude Comparators – Synthesis of various relays using Static
comparators – Block diagram of Numerical relays – Over current protection, transformer differential
protection, distant protection of transmission lines.
UNIT V CIRCUIT BREAKERS
Physics of arcing phenomenon and arc interruption - DC and AC circuit breaking – re-striking
voltage and recovery voltage - rate of rise of recovery voltage - resistance switching - current
chopping - interruption of capacitive current - Types of circuit breakers – air blast, air break, oil,
SF6, MCBs, MCCBs and vacuum circuit breakers – comparison of different circuit breakers – Rating and selection of Circuit breakers