Published on March 3, 2014
A Summer Training Presentation on “Operation and maintenance of EHV equipment and Transmission system” 2013-2014 Rajdhani Engineering College Jaipur Department of ‘Electrical Engineering Presented by:Vikas Jangir Electrical Engineering
Introduction of a substation Intermediate link between Generating station & Consumers Important part of T&D Step down high voltages Sanganer GSS Capacity : 220 kV,132kV,33 kV
220 kv GSS Sanganer • History of GSS. 1. 2 3 4 5 Established in 1981 1981 – Heerapura 132kV was there 1998 – KTPS 220kv was added 2002 – Heerapura-I 220kv was added 2005 – Heerapura-II 220kv added • Incoming feeders. 1 Heerapura I – 220kV 2 KTPS – 220kV 3 Heerapura II -220kV
Outgoing feeders • 132kv lines 1. Mansarovar I 2. Mansarovar –II 3. Balawala 4. Niwai 5. Sitapura 6. chaksu • 33kv lines • 11kv lines 1. 2. 3. 4. 5. 6. 7. 8. 1. 2. 3. 4. Muhana Mandi Malpura Vatika Phagi Sitapura Sanganer Durgapura-I Durgapura-II Tejawala Industrial Pream Nagar Muhana
Single line diagram
Classification of substation. • Basis of Nature of Duties 1. Step-Up or primary Substations 2. Primary Grid Substations 3. Step-Down or Distribution Substations • Basis of Service Rendered 1. Transformer Substations 2. Switching Substations 3. Converting Substations • Basis of Importance 1. Grid Substations 2. Town Substations
Classification on the Basis of Operating Voltage 1. High Voltage Substations 2. Extra High Voltage Substations 3. Ultra High Voltage Substations Classification on the Basis of Design 1. Indoor Type Substations 2. Outdoor Type Substations
Equipment For Substation • • • • • • • • • • • • • • Lightning Arresters Main Bus-Bars Wave Trap Switchgear Power Transformer Instruments Transformers Capacitor voltage transformer Isolators Circuit Breakers Insulators Fuses Protective Relays Station Insulators Batteries
Lightning arrester • Protective device • Equipment use power poles and towers, power transformers, circuit breakers, bus structures, and steel superstructures in substations
Wave trapper • Trap signals and send it to PLCC control Room • For information purpose
Bus-bars • Carry electrical supply • Maximum load
Switchgears • Controlling equipment • Protecting equipment 1. Equipment • Air break Switches, Oil Switches,Isolators,Circuit breaker • Earthing Switch
•Air switch breaker • Isolators
Circuit breakers • Used to Close or open electrical circuit • -It cab be operated manually or automatically Classification of C.B 1. Water circuit breaker 2. Air circuit breaker 3. Air blast circuit breaker 4. Sulphur-hexa-fluoride circuit breaker 5. Vacuum circuit breaker
Types of Transformer • • • • • Power transformer Current transformer Potential transformer Capacitance voltage transformer Distribution transformer faults in transformer • Internal faults • External faults
Current transformer • Measurement of electric currents and protective relays Potential transformer • Reduced high voltage in a fixed voltage and measurements purpose also
Faults in transformer External faults Internal faults • Must be disconnected • Not allowed to operate for long time • Failure of coolant • Short circuit in windings • Fire inside transformer • Over heating Protection Protection • Buchholz protection • Overheating protection • Cooling fans • Fire protection system • Protection against magnetizing inrush current
Cooling in transformer
Fire protection system • N2O2 • Nitrogen injection, when control panel receive indication
Substation earthing • Every instrument earthed • Lighting arresters
Control room Protection
Battery Room • Very crucial section of GSS as batteries provide power back up and also DC power for DC signaling of control equipments and fire protection system
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