Industrail training


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Industrail training

  2. 2. UPCL(Uttaranchal power corperation limited) de-mergedfrom UPPCL on 12 th feb 2001.It is renamed as Uttarakhand power corperation ltd. On 1 stjanuary 2007 as the functional bi-furcated utilitiesresponsible for the electricity distribution and powertransmission within the periphery of state.Today, it operates and maintains the substations of66/33/11 KV and distribution substations of 11/0.4 KV.
  3. 3. UPCL is committed to provide high reliability and qualitypower supply to electricity consumers spread across the 13districts of the state.Its aim is to reduce the AT and C losses to 20% by march2013.
  4. 4.  An electrical substation is a subsidiary station of an electricity distribution system where voltage is transformed from high to low or vice versa using transformers. Electric power may flow through several substations between generating plant and consumer, and may be changed in voltage in several steps.
  5. 5.  There are two types of substations constructed in UPCL- Indoor substation Outdoor substation As per standard design the switchyard of the outdoor type should be 30*20 mtrs. The capacity of 33/11 KV substation should be 3MV, 5MV, 8MV,10MV as per load demand.
  6. 6.  In an indoor substation, all the equipments are mounted indoor. Safer than outdoor substation. Require less area for switchyard.
  7. 7.  In an outdoor substation, all the equipments are mounted outdoor. Required standard size for switchyard.
  8. 8.  Current transformer Power transformer Line isolators Circuit breakers Fuse set Lightning arresters Insulators
  9. 9.  Current transformers are basically used to take the readings of the currents entering the substation. This transformer steps down the current from 800 amps to1amp. This is done because we have no instrument for measuring of such a large current.
  10. 10.  Potential transformer basically used for the transformation of voltage from higher value to lower value. It is also known as instrument transformer.
  11. 11.  The line isolators are used to isolate the high voltage flow through the line into the bus. This isolator prevents the instruments to get damaged. It also allows the only needed voltage and rest is earthed by itself.
  12. 12.  A circuit breaker is an equipment, which can open or close a circuit under normal as well as fault condition. These circuit breaker breaks for a fault which can damage other instrument in the station.
  13. 13.  It is an instrument that blown when too much current flows, which interrupts the circuit in which it is connected. Short circuit, overload or device failure is often the reason for excessive current.
  14. 14.  It is a device used in electrical power system to protect the insulation from the harmful effect of lighting. It can resists or ground the lighting if falls on the feeders.
  15. 15.  The insulator serves two purpose. They support the conductor and confine the current to the conductor. They are used to contain, separate or support electrical conductors on high voltage electricity supply networks.
  16. 16.  Most of the lines have to pass through forest area and it take a considerable time to obtain the approval from the forest department. The head load cartage of material takes time in transportation up to site. Due to its extreme weather conditions of some areas, maintenance cost increases.