Submited by:- Rajesh Meena (IV B.Tech., VII th Semester) Submitted To:- Mr. D.R.Chitra ( Head, Electrical Engineering)
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Submited by:-Rajesh Meena(IV B.Tech., VIIth Semester)
Submitted To:-Mr. D.R.Chitra( Head, Electrical Engineering)
CONTENTS OF PRESENTATION :
• Introduction• Bird view of Sub-station• 220-KV Sub-station of Hindaun (Karauli)• Definition Of Sub-station• Types of Sub-Station•Functions of substation equipments
This project includes study of transmission lines, bus bars, circuit
breakers, relay, isolators, earth switches, various types of transformers such as power transformers, capacitor voltage
transformer, current transformers, lighting arresters and grounding system
of sub-station.
There are one incoming lines for 220-kV and it step-down at 33KV outgoing feeder fro GSS,Hindaun City(Karauli) are four. There are two power transformers and the capacity of the auto.
Out going feeder of 220 KV GSS, MANDAWAR, (DAUSA) S. N. Ratings Specifications 220 KV outgoing feeders
1. 132/33 KV, 20/25 MVA Power T/F 33, Laxmangarh
2. 132/33 KV, 20/25 MVA Power T/F 33, Mahwa
3. 132/33 KV, 10/12.5 MVA Power T/F 33, Ghadi
4. 132/33 KV, 10/12.5 MVA Power T/F 33, Rajgarh
Sub-station is a subsidiary station of an electricity generation, transmission and distribution system where voltage is transformed from high to low or low to high voltage using transformers.
1. To Change voltage from one level to another.2. To Regulate voltage to compensate for system
voltagechanges.
3. To Switch transmission and distribution circuits into and out of the grid system.
4. To Measure electric power quantity flowing in the circuits.
5. To Connect communication signals to the circuits.6. To Eliminate lightning and other electrical surges
from the system.7. To Connect electric generation plants to the system.8. To Make interconnections between the electric
systems of more than one utility.
• Transmission sub-station :-A transmission sub-station is connects
two or more transmission lines.In such cases, the substation contains high-voltage switches that allow lines to be connected or isolated for fault clearance or maintenance. A transmission station may have transformers to convert the voltage from voltage level to other level.
• Distribution sub-station :-A distribution sub-station transfers power
from the transmission system to the distribution system of an area. It is uneconomical to directly connect electricity consumers to the high-voltage main transmission network, unless they use large amounts of power. So the distribution station reduces voltage to a value suitable for local distribution.
• Collector sub-station :-A collector sub-station steps up voltage to
a transmission voltage for the grid. The collector sub-station also provides power factor correction, metering and control of the wind farm. The collector systems operates around 35 kv.
• Sub-station should be located at load center• Sufficient land area• Grounding• Easy of maintenance• Possibility to Expand• Reliability and Security• Electrical design considerations
Many types of equipments are used in sub-station like Bus-Bar, Circuit Breaker, Isolators, Earthing switch, Current Transformer, Voltage Transformer, Lightning Arrester, wave trap, Power Transformer, shunt reactor etc.
• Power Transformer :-To step-up or step-down the voltage
and transfer power from one a.c. voltage another a.c. voltage at the same frequency.
• Current Transformer :-To step-down currents for measurement,
control & protection.
• CVT:-A capacitor voltage transformer (CVT) is a
transformer used in power systems to step-down extra high voltage signals and provide low voltage signals.
• Circuit Breaker :-Automatic switching during normal or
abnormal conditions.
• Isolators :-Disconnection under no-load condition for
safety, isolation and maintenance.
• Lightning Arrester :-To discharge lightning over voltages and
switching over voltages to earth.
It is incoming 220 kv feeder bus from which the line is taken to the transformer for further step down. There are two bus systems.
1Double main bus & transfer bus system 2Mesh (Ring) bus bar system
Bus Bar
RelayA relay is an automatic device by means of which an electrical circuit is indirectly (opened or closed) and is governed by a change in the same or another electrical circuit
There are many types of relay1 Over current relay2 I.D.M.T. fault relay3 Impedance relay4 Earth fault relay5 Buchhloz relay6 Differential relay7 Auxiliary relay
