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KHUDKIBOOK
SWITCHGEAR AND PROTECTION
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DI05009011
Code: DI05009011
Credits: 4
Semester 5
EC
Switchgear and Protection
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Follow on Instagram for UpdatesSwitchgear and Protection Syllabus — Unit-wise Content
The official GTU curriculum for Switchgear and Protection (subject code DI05009011) as prescribed for EC · Semester 5 divides the course into 5 units, covering 65 listed topics. The unit-wise breakdown below is read from the GTU syllabus document for this subject code, so you can check what the course actually covers before deciding which papers to attempt.
Download the official syllabus PDF (DI05009011)Unit 1 Unit 1
- Introduction to Protective System and Relay Technology ● Types of faults
- its causes and consequences
- Abnormalities ● Need for protective systems
- Functions of protective relay schemes ● Zones of Protection
- Main and Back up Protection
- Essential requirements of a protective system ● Need for Protective CT, PT and CVT, Essential features and standard ratings
- Factors to be considered for selection of CTs. ● Basic tripping circuit ● Relay Terminology
- Classification of relays ● Static Relay- Merits and demerits of static relays
- Basic elements of static relays
- Level detector
- Time-delay circuit
- Output circuit
- Auxiliary supply
- Comparator ● Numerical relays- Advantages of numerical (digital) relaying
- Organization of a numerical relay
- Facilities available in commercial numerical relays
- Comparison between static relays and numerical relays ● Working and operating characteristics of various relays: - Thermal relays
- Time delayed and Definite-time overcurrent relays
- Inverse-time and IDMT overcurrent relays
- Differential relays
- Biased or Percentage Differential Protection
- Directional relays
- Impedance relays
- Reactance relays
- Ohm relays
- Mho relays. ● Auxiliary relays Program Name: Diploma Engineering Level: Diploma Branch: Electrical Engineering Subject Code: DI05009011 Subject Name: Switchgear and Protection
Unit 2 Unit 2
- Circuit Breakers ● Circuit Breaker - Function
- Parts and Operating mechanism
- Fault clearing time of a circuit breaker
- Arc voltage and Arc interruption
- Restriking voltage and recovery voltage
- Resistance switching ● Types of circuit breaker (Construction and working): Oil, Air, SF6, Vacuum and HVDC circuit breaker ● Selection criteria for different application of Circuit Breakers
- Ratings of circuit breakers
Unit 3 Unit 3
- Transmission line & Feeder protection ● Introduction ● Radial feeder over current & earth fault protection ● Methods of discrimination: Current
- Time & and Current-Time discrimination ● Rules for setting the IDMT relay
- Relay setting calculation for sample radial feeder
- example on PSM and TMS ● Parallel feeder protection: - Need for directional relays - Directional over current and earth fault protection ● Common Problems with Overcurrent Relays ● Transmission Lines protection by Distance Relays - stepped distance characteristics of a distance relay
- Problems and limitation in distance relay ● Pilot wire protection
- Carrier current Protection ● 11kV
- 400kV transmission line protective scheme: Power circuit and control circuit with specification ● Fault characteristics of renewable Sources
- Protection of transmission and distribution networks in the presence of renewables
Unit 4 Unit 4
- Generator and Induction Motor Protection ● Generator Differential Protection
- Stator Earth Fault Protection
- Rotor earth-fault protection
- Field failure protection
- Reverse power protection
- Pole slipping protection
- Over load protection
- Program Name: Diploma Engineering Level: Diploma Branch: Electrical Engineering Subject Code: DI05009011 Subject Name: Switchgear and Protection Back up impedance protection
- Under - Frequency Protection
- Block diagram of generator protection by numerical relay ● Class A, B and C protections and conditions causing alarm ● Hydro & thermal power plant (utility scale) generator protection scheme: Power circuit and control circuit with specification ● Induction Motor: Faults and abnormal operating conditions
- Thermal Overload Protection
- Negative-Phase Sequence Protection
- Over current
- Earth-Fault Protection
- Protection against stalling ● Numerical motor-protection relay ● 415 V and 6.6 kV Industrial Induction motor protective scheme: Power circuit and control circuit with specification
Unit 5 Unit 5
- Transformer and Bus Bar Protection ● Faults in transformer
- Gas operated relay ● Transformer Over current & earth fault Protection
- Differential Protection
- Restricted Earth Fault Protection
- PRV & OSR Relay
- Transformer Protection Using a Numerical Relay ● Protection against over fluxing and over heating ● 11/220kV
- 66/11kV transformer protective scheme: Power circuit and control circuit with specifications ● Protection requirements for Bus bar ● Unit and non-unit schemes of protection for Bus bar ● Breaker backup protection ● 11kV
- 400kV bus bar protective scheme: Power circuit and control circuit with specifications ● Adaptive Protection
- Integrated Protection and Control (SCADA) 7 16%
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