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400 kv Heerapura gss ppt by ishan pdf

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400 kv Heerapura gss ppt by ishan pdf

  1. 1. A PRESENTATION ON SUMMER PRACTICAL TRAINING AT 400 KV G.S.S. HEERAPURA, JAIPUR SUBMITTED TO- SUBMITTED BY- MR. VIKAS BHALLA ISHAN KHANDELWAL H.O.D.(ELECTRICAL) 16ECTEE019 DEPARTMENT OF ELECTRICAL ENGINEERING UNIVERSITY COLLEGE OF ENGINEERING & TECHNOLOGY BIKANER
  2. 2. CONTENTS • Definition of GSS • About The GSS • Single Line Diagram of GSS • Incoming and Outgoing Feeders • All Components and Equipments of GSS • Transformer Repair Shop • Oil Test Lab
  3. 3. DEFINITION OF G.S.S. • A Substation is a part of an electrical generation, transmission, and distribution system. • A grid substation is a place where transmission voltages is stepped up/stepped down using three phase transformers and assembly of various equipment like circuit breaker, instrument transformer, bus-bars etc.
  4. 4. ABOUT THE 400KV G.S.S. HEERAPURA • It is one of the First Grid Sub Station in Rajasthan • It was established in 1986 by Rajasthan Rajya Vidyut Prasaran Nigam Limited under Govt. of Rajasthan with capacity of 250 MVA
  5. 5. SINGLE LINE DIAGRAM • Single Line Diagram (SLD) is a simplified notation for representing a three phase Power System. • It uses single lines and graphic symbols to indicate the path and component of electrical circuits. • The single line diagram of a power system is the network which shows the main connections and arrangement of the system components along with their data (such as output rating, voltage, resistance and reactance, etc.).
  6. 6. • INCOMING 400KV FEEDERS 1. BASSI-1 2. BASSI-2 3. PHAGI-1 4. PHAGI-2 5. MERTA 6. HINDAUN-1 7. HINDAUN-2 (Future) 8. JAIPUR NORTH (Future) • OUTGOING 220KV FEEDERS 1. SANGANER 2. SEZ 3. PHULERA 4. KTPS 5. NPH
  7. 7. COMPONENTS & EQUIPMENTS OF GSS • Lightning Arrestor • Wave Trap • Capacitive Voltage Transformer • Current Transformer • Isolators • Circuit Breakers • Protective Relay • Power Transformer • Bus-Bar
  8. 8. LIGHTNING ARRESTOR • It discharges the over voltage surge to the Earth and protects the other equipment from lightning and switching surges. • It is located at starting of the substation. • Zinc Oxide surge arrestors are mainly used for surge protection • Core of L.A. is of ZnO2 which offer non- linear resistance i.e. very high at normal voltage and very low at surge voltage
  9. 9. WAVE-TRAP • Wave trap is used to create high impedance to the carrier wave high frequency communication entering in to unwanted destinations typically substation. • Carrier wave communication uses up to 150kHz to 800kHz frequency to send the all the communication. These high frequency damages the power system components which are designed to operate 50 or 60 Hz. • Wave traps are also called as line traps. It consists of an inductor coil which is connected in series with the high voltage power system
  10. 10. CAPACITIVE VOLTAGE TRANSFORMER • A capacitor voltage transformer (CVT), is a transformer used in power systems to step down extra high voltage signals and provide a low voltage signal, for metering or operating a protective relay. • The capacitive potential divider, inductive element and the auxiliary transformer are the three main parts of the capacitive potential transformer. • The CVT is also useful in communication systems. CVTs in combination with wave traps are used for filtering high- frequency communication signals from power frequency. This forms a carrier communication network throughout the transmission network, to communicate between substations. The CVT is installed at a point after Lightning Arrester and before Wave trap. •
  11. 11. CURRENT TRANSFORMER • A current transformer (CT) is a type of instrument transformer that is used to measure AC current. It produces an alternating current (AC) in its secondary which is proportional to the AC current in its primary. • Current transformers are the current sensing units of the power system. Current transformers are used at generating stations, electrical substations, and in industrial and commercial electric power distribution. • Current transformers are used extensively for measuring current and monitoring the operation of the power grid.
  12. 12. ISOLATORS • Isolator is a mechanical switch which isolates a part of circuit from system as when required. • Electrical isolators separate a part of the system from rest for safe maintenance works. • Isolators are used to open a circuit under no load. Its main purpose is to isolate one portion of the circuit from the other and is not intended to be opened while current is flowing in the line. • Isolators are generally used on both ends of the breaker in order that repair or replacement of circuit breaker can be done without and danger.
  13. 13. CIRCUIT BREAKERS • A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current, typically resulting from an overload or short circuit. • Its basic function is to interrupt current flow after a fault is detected. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation. • SF6 circuit breakers are used in the G.S.S. because due to superior arc quenching property of SF6 gas, such circuit breakers have very short arching time. • SF6 circuit breaker gives noiseless operation due to its closed gas circuit and no exhaust to atmosphere unlike air blast circuit breaker. • No. of C.B. at 220 KV side : 12 • No. of C.B. at 400 KV side : 18
  14. 14. PROTECTIVE RELAY • A protective relay is a device that detects the fault and initiates the operation of circuit breaker to isolate the defective part from the rest of the system. • Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays. Solid-state relays control power circuits with no moving parts, instead using a semiconductor device to perform switching. • Relays are used where it is necessary to control a circuit by a separate low-power signal, or where several circuits must be controlled by one signal. • A type of relay that can handle the high power required to directly control an electric motor or other loads is called a contractor.
  15. 15. POWER TRANSFORMER • A Transformer is a static machine used for transforming power from one circuit to another without changing frequency. • Transformer operates on AC supply. Transformer works on the principle of Mutual Induction. • Power Transformer are used to step-down the voltage at Sub-Stations. • There are four Power Transformer installed at Heerapura 400 KV GSS. These are named as ILT-1, ILT-2, ILT-3 and ILT- 4.
  16. 16. BUS-BAR • An electrical bus-bar is defined as a conductor or a group of conductors used for collecting electric power from the incoming feeders and distributes them to the outgoing feeders. • The bus-bar system consists of the isolator and the circuit breaker. On the occurrence of a fault, the circuit breaker is tripped off and the faulty section of the bus-bar is easily disconnected from the circuit. • The electrical bus-bar is available in rectangular, cross- sectional, round and many other shapes. The copper and aluminium are used for the manufacturing of the electrical bus- bar. • The bus-bar arrangement in 400 kV GSS at 400 kV side are two main bus A and B. Both buses are aluminium hollow pipe bus with diameter 114.2 mm and current carrying capacity is 2000 Amp. The bus-bar arrangement at 220 kV side are three main bus D, E and F. These are twin moose conductor bus. • One and half breaker Scheme is used at 400KV GSS
  17. 17. CONTROL ROOM • Control panels contain meters, control switches, and recorders located in the control building. • These are used to control the Sub- Station equipment, to send power from one circuit to another or to open or to shut down circuit when needed.
  18. 18. BATTERY ROOM • A battery room is a room in a facility used to house batteries for backup or uninterruptible power systems. • Battery room has 55 batteries of 2 volts each for 132kv section and 110 batteries for 220/400kv section. Therefore, DC power available is for functioning the control panels. • A battery charger is used to charge the battery.
  19. 19. TRANSFORMER REPAIR SHOP • Heerapura GSS have Transformer repair shop facility. • It has several heavy equipments and trained technicians. • Power transformers are repaired here which come here from all over the Rajasthan
  20. 20. OIL TEST LAB • 400 KV GSS Heerapura has Oil Test Lab Facility. • Transformer Oils are tested here with the help of various advanced equipments.

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