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Gas insulated substation 1

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this presentation give detail about GAS substation.

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Gas insulated substation 1

  1. 1. GAS INSULATED SUBSTATION RONAL PARMAR 140080707003 BIRLA VISHVAKARMA MAHAVIDHYALAYA
  2. 2. CONTENTS  Introduction  Conventional substation ( AIS )  Limitation of AIS  Need for GIS  Introduction to GIS  GIS unique features  Components of GIS substation  Advantages of GIS over conventional open air substation  Disadvantage of GIS  Next presentation work
  3. 3. INTRODUCTION  For maintaining proper voltage levels at transmission and distribution level and for providing greater stability a number of electrical transformation and switching setups have to be created in between generating station and consumer ends. These transformation and switching setups are generally known as electrical substations.  Based on nature of dielectric medium a substation is of two types as following : 1. AIS (Air insulation sub-station ) 2. GIS ( Gas insulation sub-station )
  4. 4. CONVENTIONAL SUBSTATION
  5. 5. LIMITATION OF AIS  Physical factor  Infrastructure factor  Social & Environmental factor  Commercial factor
  6. 6. NEED OF GIS  Non availability of sufficient space. It is very much required to establish a substation at load center. Establishing a substation at load center is quite economical and profitable in following ways : A. Reduction in length of feeders B. Improvement of the quality of voltage regulation due to short length feeders  Difficult climatic and seismic conditions at site, like high altitude and atmospheric pollution  Aesthetically “superior” to air insulated substations  The higher the voltage, the more favorable gas insulated technology becomes  Overcomes or decreases the magnitude of limitations of AIS site selection
  7. 7. INTRODUCTION OF GIS  Gas insulated substations (GIS) have been used in power systems over the last three decades because of their high reliability, easy maintenance, small ground space requirement etc. In India also, a few GIS units are under various stages of installation.  Gas insulated bus has a surge impedance (70Ω) more than that of the conventional oil filled cables, but much less than that of an over head line (300Ω - 400Ω). Further, the average bus run for a compact GIS is much less than that for the conventional station.  life of GIS is affected by several factors such as: A. conductive particles B. particle discharges C. contamination  The GIS require less number of lightning arresters than a conventional one. This is mainly because of its compactness.
  8. 8. CONTI….  The basic consideration for insulation coordination is V-T characteristic. The V-T characteristic of SF6 is considerably flat compared to that of air.  Air can withstand to very high voltages for very short time. However, as the duration of voltage increases, the withstand voltage falls off considerably.  On the other hand, SF6 exhibits a flat characteristic, thus the ratio of basic lightning impulse level is close to unity for GIS, whereas for the conventional substations this ratio varies between 0.6 and 0.86.  Gas insulated substations are in service up to the highest voltage of 800 kV, meeting almost all the requirements in urban, industrial as well as rural areas.
  9. 9. GIS UNIQUE FEATURE 1. Wide spread application of aluminium enclosure materials for standardized component models for all voltage ranges 2. The light weight enclosures have good conductivity, low eddy- current losses and a high resistance to corrosion 3. Easy handling, as well as reduced stresses on foundation and support structure are additional features 4. Standard arrangements can be easily modified and extended with good co-ordination between the manufacturer and the user. 5. A gas- tight barrier insulator in switchgear serve for the separation of gas compartments and prevents neighbouring switchgear parts from being affected during maintenance.
  10. 10. Components of GIS substation 1. Circuit breaker 2. Disconnector switch 3. Earthing switch 4. Current transformer 5. Voltage transformer 6. Bus bar & connectors 7. Power transformer 8. Surge arrester 9. Cable termination 10. SF6 / air or SF6 / oil bushing
  11. 11. ADVANTAGES OF GIS OVER CONVENTIONAL OPEN AIR SUBSTATION  Area and volume saving in construction for over or underground applications.  Greatly improved safety and reliability due to earthed metal housing of all high voltage parts and much higher intrinsic strength of SF6 gas as insulation.  Short on site erection times  Fulfilment of aesthetic requirements with indoor applications  High service reliability  Reduction in radio interference with the use of earthed metal enclosures  Use as mobile substations for transportation to load centres on standard tracks.  More optimal life cycle costs  Not necessary that high voltage switchgear has to be installed out doors.
  12. 12. DISADVANTAGE OF GIS  Switching operation generate Very Fast Transients Over Voltages (VFTOS).  VFTOS may cause secondary breakdown inside a GIS and Transient Enclosure Voltages (TEV) outside the GIS.  Field non-uniformities reduce withstanding levels of a GIS.  Prolonged arcing may produce corrosive/toxic by- products.  Support spacers can be weak points when arc by- products and metallic particles are present.
  13. 13. NEXT PRESENTATION WORK  Type of GIS sub-station  Construction of low & medium voltage GIS sub- station  Construction of high voltage GIS sub-station  Maintenance of GIS sub-station  GIS approach in the GRID  Visit of 400/220KV GIS substation located at DASTAN , bardoli ,
  14. 14. REFERENCE  M.Bilal Latif “ Comparison of GIS substation over conventional substation “ , IEEE  http://www.pserc.wisc.edu/documents/publications/papers/20 01_general_publications/indicator.pdf

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