Power Transmission and Distribution GIL · Operation similar to overhead lines with autoreclosure...
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GIL Madrid IEEE 21.6.2005 Power Transmission and Distribution GIL The most powerful AC Power Transmission System Gas Insulated Transmission Lines
Transcript of Power Transmission and Distribution GIL · Operation similar to overhead lines with autoreclosure...
GILMadrid
IEEE 21.6.2005
Power Transmission and Distribution
GIL The most powerfulAC Power Transmission System
Gas Insulated Transmission Lines
GILMadrid
IEEE 21.6.2005
Contents
25 Years of Proven Experiences
Second Generation GIL
Design and Technical Data
Outdoor Installation GIL
Tunnel Installation GIL
Directly Buried GIL
Conclusions
GILMadrid
IEEE 21.6.2005
References Worldwide 1974 - 2004
Installed phase length: 110 km world-wide
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IEEE 21.6.2005
GIL Principle
Principle:Gas insulated bus ducts are welded up to the desired length
Principle:Gas insulated bus ducts are welded up to the desired length
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IEEE 21.6.2005
Reference: Wehr, GermanyOperation since 1975, Tube Length 4 km
1 600 MVA Transformer Rated Voltage 420 kV2 Encapsulated Surge Arrestors Rated Impulse3 Transfer Switching units Withstand Voltage 1640 kV4 GIL Connection Rated Current 2000 A5 Open Air Surge Arrestor Rated Short-Time Current 53 kA6 Overheadline
54
3,5 m
2,8
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IEEE 21.6.2005
Reference: Bowmanville, CanadaOperation since: 1985-87, Length 2.5 km
Rated Voltage 550 kVRated Impulse Withstand Voltage 1550 kVRated Current 4000 / 6300 / 8000 ARated Short-Time Current 100 kA
Rated Voltage 550 kVRated Impulse Withstand Voltage 1550 kVRated Current 4000 / 6300 / 8000 ARated Short-Time Current 100 kA
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IEEE 21.6.2005
Reference: Palexpo exhibition Centre, Geneva, SwitzerlandCommissioning: 2001
Rated Voltage 300 kVRated Current 2000 ARated Impulse Withstand Voltage 1050 kVRated Short-TimeCurrent 50 kA, 1s
Rated Voltage 300 kVRated Current 2000 ARated Impulse Withstand Voltage 1050 kVRated Short-TimeCurrent 50 kA, 1s
GILMadrid
IEEE 21.6.2005
Contents
25 Years of Proven Experiences
Second Generation GIL
Tunnel Installation GIL
Design and Technical Data
Outdoor Installation GIL
Directly Buried GIL
Conclusions
GILMadrid
IEEE 21.6.2005
Improvements of the Second Generation GIL
Overall cost reduction of > 50% compared to first generation GIL by:
Standardization of components:Modular design for tailor-made installations
Improvements of assembly and laying procedure-Pipeline laying technique for short installation time-Automated orbital welding machine for high quality welds-Elastic bending of tubes to follow the route
Reduction of SF6 content to 20%Cost reduction and environmental protection by usingnitrogen as a majority gas
Overall cost reduction of > 50% compared to first generation GIL by:
Standardization of components:Modular design for tailor-made installations
Improvements of assembly and laying procedure-Pipeline laying technique for short installation time-Automated orbital welding machine for high quality welds-Elastic bending of tubes to follow the route
Reduction of SF6 content to 20%Cost reduction and environmental protection by usingnitrogen as a majority gas
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IEEE 21.6.2005
GIL automated welding
• Ensures absolute gas tightness• Enables reproducable high quality, low cost welding• Ensures absolute gas tightness• Enables reproducable high quality, low cost welding
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IEEE 21.6.2005
GIL automated welding
GILMadrid
IEEE 21.6.2005
Contents
25 Years of Proven Experiences
Second Generation GIL
Tunnel Installation GIL
Design and Technical Data
Outdoor Installation GIL
Directly Buried GIL
Conclusions
GILMadrid
IEEE 21.6.2005
Technical Data of the Standard Design
Rated voltage 420 / 550 kVImpulse withstand voltage 1425 / 1600 kVRated current up to 4000 ARated short-time current 63 kA / 3 sRated transmission load up to 3500 MVAOverload capability (typical) up to 100 %Insulation gas N2/SF6 mixture at 0.7 Mpa
Rated voltage 420 / 550 kVImpulse withstand voltage 1425 / 1600 kVRated current up to 4000 ARated short-time current 63 kA / 3 sRated transmission load up to 3500 MVAOverload capability (typical) up to 100 %Insulation gas N2/SF6 mixture at 0.7 Mpa
Designed and tested according to IEC 61640 „HV gas-insulated transmission lines for rated voltages of 72.5 kV and above”
Designed and tested according to IEC 61640 „HV gas-insulated transmission lines for rated voltages of 72.5 kV and above”
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IEEE 21.6.2005
GIL units
Generally 4 different component types are required to build a Gas Insulated Transmission Line!
Generally 4 different component types are required to build a Gas Insulated Transmission Line!
Straight Module
Angle Module
Disconnector Module
Compensator Module
Straight Module
Angle Module
Disconnector Module
Compensator Module
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IEEE 21.6.2005
Straight Unit
- Typical length of 120 m - Bending radius down to 400 m
- Typical length of 120 m - Bending radius down to 400 m
350 ft
5b 5a 3 4 1 2 4 5b
1 enclosure2 inner conductor3 conical insulator4 support insulator5a male sliding contact5b female sliding contact
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Angle Unit
350 ft
5 52143a3b 3a
- for directional changes- flexible angle from 4° to 90°
- for directional changes- flexible angle from 4° to 90°
1 enclosure2 inner conductor3a male sliding contact3b female sliding contact4 conical insulator5 support insulator
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IEEE 21.6.2005
Disconnector Unit
- Segregation of gas compartments- Enables sectional commissioning- Location of the decentralized monitoring units
- Segregation of gas compartments- Enables sectional commissioning- Location of the decentralized monitoring units
1 enclosure2 inner conductor3a male sliding contact3b female sliding contact4 conical insulator5 support insulator
< 120 m
3b 5 3b43b 3a2413a
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Compensation Unit
- Compensation for the thermal expansion of the enclosure
- Flexible connectors are carrying the current
- Compensation for the thermal expansion of the enclosure
- Flexible connectors are carrying the current
1 enclosure2 inner conductor3a male sliding contact3b female sliding contact4 conical insulator5 flexible connector6 compensator bellow
3b 3a1 2 456
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Features of GIL (part 1)
High ampacity
Low transmission losses
Low capacitance, no compensation necessary
High reliability
No practical ageing of components (CIGRE)
High ampacity
Low transmission losses
Low capacitance, no compensation necessary
High reliability
No practical ageing of components (CIGRE)
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Features of GIL (part 2)
Very low magnetic fields, no electrical field outside GIL
High operational safety: - no external influence in the case of an internal failure- no fire risk
Operation similar to overhead lines with autoreclosure
more than 30 years of experience with gas insulatedsystems
Very low magnetic fields, no electrical field outside GIL
High operational safety: - no external influence in the case of an internal failure- no fire risk
Operation similar to overhead lines with autoreclosure
more than 30 years of experience with gas insulatedsystems
GILMadrid
IEEE 21.6.2005
.5
1.
2.
5.10.
20.
10.
20.
50.
100.200.
500.
1000
Magnetic Field Calculation for GIL and CableRated Current: 2500 A
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5.5.
20.20.20.20.
10.10. 5.5.
10.10.
5.5.20.20.
20.20.50.50. 50.50.
100.100. 100.100.200.200.
200.200. 200.200.
200.200.500.500. 500.500.
Magnetic Field Calculation for OHL
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Transmission Losses: Comparison of GIL, Overhead Line, and Cable
0
100
200
300
400
500
600
500 1000 1500 2000 2500
OHL4x240/40 Al/St
W/m
180014001000700350A
MVA
XLPE Cable2XKLDE2Y1x1600
GIL
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GIL Features
No ageing of the GIL components:
Insulators
Enclosures and conductors
Insulation gas
Source:
„Long Term Performance of SF6 Insulated Systems“,
Cigre TF 15.03.07, Cigre Session 2002
⇒ No ageing of N2 ⇒ No ageing of GIL
⇒ No lifetime limit for GIL systems!
No ageing of the GIL components:
Insulators
Enclosures and conductors
Insulation gas
Source:
„Long Term Performance of SF6 Insulated Systems“,
Cigre TF 15.03.07, Cigre Session 2002
⇒ No ageing of N2 ⇒ No ageing of GIL
⇒ No lifetime limit for GIL systems!
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IEEE 21.6.2005
Internal Arc Fault as Part of Type Test
View inside the GIL Test Conditions: 63 kA, 500ms
View inside the GIL Test Conditions: 63 kA, 500ms
No external impact
Low pressure increase
No fire risk due to noninflammable materials
No external impact
Low pressure increase
No fire risk due to noninflammable materials
Enclosure
Conductor
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IEEE 21.6.2005
Contents
25 Years of Proven Experiences
Second Generation GIL
Tunnel Installation GIL
Design and Technical Data
Outdoor Installation GIL
Directly Buried GIL
Conclusions
GILMadrid
IEEE 21.6.2005
GIL outdoor installaion
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IEEE 21.6.2005
Possible GIL outdoor layout
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IEEE 21.6.2005
GIL outdoor arrangement
GILMadrid
IEEE 21.6.2005
Contents
25 Years of Proven Experiences
Second Generation GIL
Design and Technical Data
Tunnel Installation GIL
Directly Buried GIL
Conclusions
GILMadrid
IEEE 21.6.2005
GIL Arrangement in a Tunnel
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Laying and Commissioning in the Tunnel
Principledrawing
1 Delivery and supply of prefabricated elements
2 Mounting and welding3 Pulling the GIL into the
tunnel4 High voltage test
GILMadrid
IEEE 21.6.2005
Contents
25 Years of Proven Experiences
Second Generation GIL
Design and Technical Data
Tunnel Installation GIL
Directly Buried GIL
Conclusions
GILMadrid
IEEE 21.6.2005
Directly Buried GIL
GILMadrid
IEEE 21.6.2005
Directly Buried GILLaying Process
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Directly Buried GILOrbital Welding and Backfill in the Trench
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IEEE 21.6.2005
Contents
25 Years of Proven Experiences
Second Generation GIL
Design and Technical Data
Tunnel Installation GIL
Directly Buried GIL
Conclusions
GILMadrid
IEEE 21.6.2005
Conclusion
• Siemens has more than 30 years of GIL experience• Up to now no major failure occurred• GIL is easy to operate and it combines technical
advantages with low operation and life cycle costs.
• Siemens has more than 30 years of GIL experience• Up to now no major failure occurred• GIL is easy to operate and it combines technical
advantages with low operation and life cycle costs.
GIL is the future high power, long distance AC underground transmission system!
GIL is the future high power, long distance AC underground transmission system!
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IEEE 21.6.2005
Comparison Cable - GIL
Direct Burial XLPE (500 kV) GIL
Rated Voltage 420 kV 420 kV
Impulse Withstand Voltage 1425 kV 1425 kV
Rated Current 1350 A (no forced cooling) 2700 A
Rated Short Time Current 50 kA, 0.5 s 63 kA, 1 s
Rated Transmission Load 1000 MVA (cos phi=1) 2000 MVA (cos phi=1)
Insulation XLPE N2/SF6 Mixture
Cross Section 2500 mm² Cu 5500 mm² Al
Max. Operational Temperature
90° C (conductor)100 °C (conductor)
Overload Capacity Max. 1.2 Up to 2
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IEEE 21.6.2005
Comparison Cable - GIL
Other Criteria
Degrading of Insulation 30 years- (gaseous insulation)
Autoreclosing Capacity No Yes
Maintenance Cycle2 years (corrosion protection)
2 years (corrosion protection)
Repair Down-time (max. in case of conductor interruption)
2 weeks 2 weeks
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GIL Earthquake Issues
Seismic calculations show that earthquakes do no harm toGIL installationsSeismic calculations show that earthquakes do no harm toGIL installations
