The document discusses gas insulated substations (GIS), which use sulfur hexafluoride (SF6) gas as the insulating medium within an enclosed metal housing. GIS offer advantages over traditional air insulated substations (AIS), as they occupy less space, have higher reliability, and require less maintenance. The key components of a GIS include gas insulated busbars, circuit breakers, disconnectors, earthing switches, and voltage and current transformers. While more expensive initially, GIS allow for more compact and reliable substation design in space-constrained urban areas. Some concerns with GIS include the environmental impact of SF6 and the challenges associated with diagnosing and repairing internal
As the AIS (Air-Insulated Substation) is having more limitations, More and more people are going for the Gas-Insulated Substation which is environment friendly as well.
In these presentation, We discussed about theoritical and technological advancement and advantages related to GIS as compared to other substations.
We discussed different parts of the GIS as well as their operations and advantages.
By going through this presentation, you will have idea regarding comparative advantages and disadvantages of both substations.
GIS – Necessary for Extra HV & Ultra HV
Some important areas to be studied include:
More conservative design.
Improved gas handling.
Decomposition product management techniques.
Achieving & maintaining high levels of availability require – more integrated approach to quality control by both users and manufactures.
As the AIS (Air-Insulated Substation) is having more limitations, More and more people are going for the Gas-Insulated Substation which is environment friendly as well.
In these presentation, We discussed about theoritical and technological advancement and advantages related to GIS as compared to other substations.
We discussed different parts of the GIS as well as their operations and advantages.
By going through this presentation, you will have idea regarding comparative advantages and disadvantages of both substations.
GIS – Necessary for Extra HV & Ultra HV
Some important areas to be studied include:
More conservative design.
Improved gas handling.
Decomposition product management techniques.
Achieving & maintaining high levels of availability require – more integrated approach to quality control by both users and manufactures.
High Voltage Gas Insulted Switchgear (GIS) Field Testing According to IEEE C3...Ali Sepehri
High Voltage Gas Insulted Switchgear (GIS) Field Testing According to IEEE C37.122
Article direct link: https://www.linkedin.com/pulse/high-voltage-gas-insulted-switchgear-gis-field-testing-ali-sepehri/
A gas insulated substation (GIS) is a high voltage substation in which the major structures are contained in a sealed environment with sulfur hexafluoride gas as the insulating medium. GIS technology originated in Japan, where there was a substantial need to develop technology to make substations as compact as possible. The clearance required for phase to phase and phase to ground for all equipment is much lower than that required in an air insulated substation; the total space required for a GIS is 10% of that needed for a conventional substation.
Power Quality is a combination of Voltage profile, Frequency profile, Harmonics contain and reliability of power supply.
The Power Quality is defined as the degree to which the power supply approaches the ideal case of stable, uninterrupted, zero distortion and disturbance free supply.
HVDC (high-voltage direct current) is a highly efficient alternative for transmitting large amounts of electricity over long distances and for special purpose applications.
Over Head Line Insulators : Presentation Topic in Electrical Engineering SeminarSandip Kumar Sahoo
Over Head Line Insulators a Presentation Topic in Electrical Engineering for Seminars was prepared by me with comprehensive research and phenomenal guidance. You just need a little research on the mentioned points and you are ready to go. I hope this PPT will help you immensely.
A brief about 33kv Substation........
like and share.................
want some help in your ppt or in any project visit..
https://www.fiverr.com/dawachya
High Voltage Gas Insulted Switchgear (GIS) Field Testing According to IEEE C3...Ali Sepehri
High Voltage Gas Insulted Switchgear (GIS) Field Testing According to IEEE C37.122
Article direct link: https://www.linkedin.com/pulse/high-voltage-gas-insulted-switchgear-gis-field-testing-ali-sepehri/
A gas insulated substation (GIS) is a high voltage substation in which the major structures are contained in a sealed environment with sulfur hexafluoride gas as the insulating medium. GIS technology originated in Japan, where there was a substantial need to develop technology to make substations as compact as possible. The clearance required for phase to phase and phase to ground for all equipment is much lower than that required in an air insulated substation; the total space required for a GIS is 10% of that needed for a conventional substation.
Power Quality is a combination of Voltage profile, Frequency profile, Harmonics contain and reliability of power supply.
The Power Quality is defined as the degree to which the power supply approaches the ideal case of stable, uninterrupted, zero distortion and disturbance free supply.
HVDC (high-voltage direct current) is a highly efficient alternative for transmitting large amounts of electricity over long distances and for special purpose applications.
Over Head Line Insulators : Presentation Topic in Electrical Engineering SeminarSandip Kumar Sahoo
Over Head Line Insulators a Presentation Topic in Electrical Engineering for Seminars was prepared by me with comprehensive research and phenomenal guidance. You just need a little research on the mentioned points and you are ready to go. I hope this PPT will help you immensely.
A brief about 33kv Substation........
like and share.................
want some help in your ppt or in any project visit..
https://www.fiverr.com/dawachya
FACULTY OF ENGINEERING & TECHNOLOGY , GURUKULA KANGARI UNIVERSITY ,HARIDWARashwini kumar
THIS PROJECT IS RELATED TO GAS INSULATED SUBSTATION,,IN THIS SUBSTATION SF6 GAS IS USED
ASHWINI KUMAR
ELECTRICAL ENGINEERING(FINAL YEAR)
ashwinikmr555@gmail.com
+919027134556
In today circumstance, rapid development of power system network cause the fault current of the system increased greatly .
The levels of fault current in many places have often exceeded the withstand capacity of existing power system equipment.
As implication to this matter ; security , stability and reliability of power system will be negatively affected .
Thus , limiting the fault current of the power system to a safe level can greatly reduce the risk of failure to the power system equipment due to high fault current flowing through the system. Because of that, there is no surprise to fault current limiter (FCL) become a most favourite research since this technology can limit the fault current .
this ppt gives u a clear idea about substations ..there are two types of substation
1) air insulated substations
2) gas insulated substations
this ppt is about air insulated substations and gas insulated substations
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1. GAS INSULATED SUBSTATION
Presented By
Ajooba Alam
1RN13EE004
EEE, 8th semester
Under the guidance of
Mr. B Mallikarjuna
Assistant Professor
Electrical & Electronics Dept.,
RNSIT, Bengaluru 1
ATechnical Seminar
On
3. Contents
• Substation
• Conventional substations (AIS)
• Limitations of AIS
• The need for GIS
• Introduction to GIS
• Properties of SF6
• GIS assembly
• Advantages of GIS
• Design features
• Drawbacks
• SF6 – Environmental concerns
• SF6 /N2 mixtures
• Future trends inGIS
• Conclusion.
3
4. Substation:
• An assembly of apparatus installed to control
transmission and distribution of electric power.
A:Primary power lines' side B:Secondary power lines' side
1.Primary power lines 2.Ground wire 3.Overhead lines 4.Transformer for measurement of electric voltage 5.Disconnect switch 6.Circuit breaker
7.Current transformer 8.Lightning arrester 9.Main transformer 10.Control building 11.Security fence 12.Secondary power lines
4
5. Air Insulated Substation(AIS):
• Air used as a dielectric.
• Normally used for outdoor substations.
• In very few cases used for indoor substations.
• Easy to expand (in case that space is not an issue)
• Excellent overview, simple handling and easy access.
5
6. Limitations of AIS:
• Large dimensions due to statutory clearances and poor dielectric
strength of air.
• Insulation deterioration with ambient conditions and susceptibility to
pollutants.
• Wastage of space.
• Life of steel structures degrades.
• Seismic instability.
• Large planning & execution time.
• Regular maintenance of the substation required.
6
7. The need for G.I.S:
• Non availability of sufficient space.
• Difficult climatic and seismic conditions at site.
• Urban site (high rise building).
• High altitudes.
• Limitations of AIS.
7
8. Gas Insulated Substation
Introduction:
• Compact, multi-component assembly.
• Enclosed in a ground metallic housing.
• Sulphur Hexaflouride (SF6) gas – the primary insulating
medium.
• (SF6) gas- superior dielectric properties used at moderate
pressure for phase to phase and phase to ground insulation
• Preferred for voltage ratings of 72.5 kV, 145 kV, 300 kV and
420 kV and above.
• Various equipments like Circuit Breakers, Bus-Bars, Isolators,
Load Break Switches, Current Transformers, Voltage
Transformers, Earthing Switches, etc. housed in metal
enclosed modules filled with SF6 gas.
8
9. Properties of SF6
• Non-toxic, very stable chemically.
• Man-made.
• Lifetime –Very long (800 to 3200 years!).
• Insulating properties 3-times that of air.
• Colorless & heavier than air.
• Almost water insoluble.
• Non inflammable.
9
16. Advantages :
• Occupies very less space (1/10th) compared to ordinary
substations.
• Hence, most preferred where area for substation is small (eg:
Cities)
• Most reliable compared to Air Insulated Substations.
• Number of outages due to the fault is less
• Maintenance Free.
• Can be assembled at workshop and modules can be
commissioned in the plant easily.
16
19. Design Challenges
1. Safety:
• Optimizing operating electrical stresses to safe levels by
better inter electrode spacing .
• Increasing the gas volume and the thermal inertia of the
system to enhance cooling and retain insulation strength.
2. High reliability:
• Superior contact systems for Circuit Breakers and
Disconnectors.
• Multi-contact and friction free surfaces incorporated for
long operating cycles.
• Rugged, time proven operating drives used.
19
22. Main Drawbacks
• High cost compared to conventional substation(AIS).
• Excessive damage in case of internal fault.
• Diagnosis of internal fault and rectifying takes very
long time (high outage time).
• SF6 gas pressure must be monitored in each
compartment.
• Reduction in the pressure of the SF6 gas in any
module results in flash over and faults.
• SF6 causes ozone depletion and global warming.
22
23. SF6 – Environmental Concerns
• Currently, 80% used by Electrical Power industry.
• Other Uses – micro-electronics; Al & Mg production.
• 7000 metric tons/yr in 1993.
• Reached 10,000 metric tons/yr by 2010.
• Two areas of Health and Environmental impact:
I. Through its normal use in a work place – Arcing
byproducts.
II. Global Environmental impact - Ozone depletion and
Global warming.
23
25. SF6/N2 Mixtures for GIS?
• SF6 gas – specifically mentioned in Kyoto protocol.
• Small quantities of SF6 in N2 can improve dielectric
strength drastically.
• All of the dielectric strength of SF6, nearly, can be
achieved by adding less than 20% SF6 into N2.
• SF6/N2 mixtures less susceptible to effects of field non
uniformity than pure SF6.
• Thus mitigating the effects of particles and surface
protrusions.
25
26. Future trends
• Compact design of switch gear by using three phase
modules.
• Use of vacuum circuit breaker cells in the medium high
voltage GIS.
• Optimization of GIS design to allow easier
maintenance.
• Development of DC GIS for incorporating into
expanding national/international HVDC systems.
• Search for replacement gases for SF6.
• The most promising - an 80%/20% N2/SF6 mixture.
• Replacement of existing AIS by GIS will accelerate
especially near urban centers.
26
27. CONCLUSION
• GIS – necessary for Extra HV & Ultra HV
• Some important areas to be studied include:
• More conservative design.
• Improved gas handling.
• Decomposition product management techniques.
• Achieving & maintaining high levels of availability
require – more integrated approach to quality control
by both users and manufactures.
27
28. References
• G.F. Montillet, E. Mikes et al. "Underground transmission and
distribution GIS solutions" IEEE/PEST&D Exposition and Conference,
DallasUSA, 2003.
• E. Mikes, Ch.Tschannen, et al. "GIS substation extensions and
upgrades" CEPSI PaperT1-068, 2000, Manila, Philippines.
• CIGREWG 23.10; Paper 23-102, 1998, Report on the Second International
Survey on High-Voltage Gas Insulated Substations (GIS) Service
Experience, Paris, France 1998.
• E. Mikes, H. Aeschbach et al. "InnovativeGIS based solutions for
substations" CIGRE SC23 ColloquiumVenezuela, Paper 3.1, 2001.
• D. Dufournet, C. Lindner et al. "TechnicalTrends in Circuit Breaker
SwitchingTechnologies"CIGRE SC A3 Colloquium paper, Sarajevo,
Bosnia, 2003.
• H. Aeschbach, E. Mikes, et al. "Space saving GIS based hybrid modules
and innovative solutions influencing substation space and life cycle
cost judgments"CEPSI PaperT2-A-7, 2002.
28