siemens 1200kv
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1200 kV AC Substations -
Products and Integrated Solutions
International UHV Symposium
New Delhi, 29. January 2009
Edelhard KynastSiemens AG, Energy
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Environmental conditions
Electrical Requirements
1200 kV AC Substation
Basic requirements - Example: PGCIL
Temperature (min / average / max) +4 C / 38 C / 50 C
Seismic Zone 1
Wind 47 m/s
Altitude
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AIS is PGCIL
preferred technology
Minimum Clearances
Minimum clearance phase to earth 8300 mm
Minimum clearance phase to phase 11600 mm
(According to draft IEC 60071-1 Amd.1 Ed. 8.0, 2008-05-16)
Lowest part of insulation 3500 mm
Min. height lowest live part 18000 mm
Working clearance 18000 mm
1200 kV AC Substation
Basic requirements - Example: PGCIL
Assumed distances
Bay distances
Phase to phase distance 20000 mm
Bay width 62000 mm
Three live part levels
1. Height of lower conductor level 18000 mm
2. Height of busbar 36000 mm
3. Height of long spans 55000 mm
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Arrangement is simple and clear
Acceptable costs
Unrestricted and non-stop
operation of all feeders in 2 groups Busbar maintenance without
interruption of power supply
Double Busbar Configuration
1200 kV AC Substation
Circuit Configurations
1 Breaker Configuration
2 Breaker Configuration
Recommended solution:
more
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1200 kV AC Substation
Double Busbar arrangement - Layout
115,0 m 80,0 m 92,5 m
287,5 m
62,0m
62,0m
51,0m
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1200 kV AC Substation
Double Busbar Arrangement - Layout
- Surge Arresters
- Disconnectors
- Dead Tank Circuit Breakers
- Current Transformers
- Capacitive Voltage Transformers
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Based on 800 kV DC-
Application
5 unit surge arrester with
grading and corona ring
Active part with four columns
in parallel
Additional cooling with
aluminum blocks between MO
varistors
1200 kV AC Surge Arresters
Development
800 kV DC Design
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Designation 3EQ5 850-5PT95
Rated voltage 850 kV
Continuous operating voltage 723 kV
Nominal discharge current 20 kA
Lightning impulse protection level 1700 kV
Switching impulse protection level 1500 kV
Energy discharge capability 55 MJ
Creepage distance 35750 mm
(30 mm/kV)Height 12 m
Bending moment 150 kNm
1200 kV AC Surge Arresters
Technical Data
Voltage-current characteristic
of a MO surge arrester
for 1200 kV AC power system
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Experience in Double Side Break Disconnectors for UHV application
- Double side break ZBF 800 kV AC in service in Ucraine
- Double side break ZBF 515 kV DC in service in China
- Double side break ZBF 824 kV DC installation in China
Double Side Break design advantages for 1200 kV AC application
- high reliability due to the reduced number of moving parts
in the kinematic chain and in the current path
- well proven turn and twist design of the current path
- space savings in the vertical dimension due to the current path
movement only in the horizontal direction
1200 kV AC Disconnector - Project Powergrid India
Recommendation for Double Side Break Design
Centre BreakDisconnectors72,5 ... 550 kV
PantographDisconnectors123 ... 550 kV
Knee-TypeDisconnectors
123 kV550 kV
Vertical BreakDisconnectors123 ... 550 kV
Double Side BreakDisconnectors
36 ... 800 kV
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1200 kV AC Disconnector
Specified Requirements - Project Powergrid India
Technical parameters 1200 kV ACdisconnector & earthing switch
Rated voltage 1200 kV
Frequency 50 Hz
Normal current 6000 Amps
Short time withstand current 50 kA / 1 s
Peak withstand current 125 kA
Lightning impulse withstand voltage
- phase- to- earth 2400 kV
- across isolating distance 2400 kV+685 kV
Switching impulse withstand voltage- phase- to- earth 1800 kV
- across isolating distance 1800 kV + 980kV
Creepage distance of insulators 25 mm/kV ZBF 824 kV DC, DoubleSideBreakProject Yun Guang, China
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UHV - Circuit-Breaker 1200 kV
Testing: Short circuit performance
T100a (February 2008)
Full pole test
Time constant 120 ms
Value of last current loop 115 kAFirst pole to clear factor 1,3 p. u.
TRV peak value 1600 kV
Minimum arcing time 10,3 ms
T10(April 2008)Full pole test
First pole to clear factor 1,5 p. u.
TRV peak value 2062 kV
Minimum arcing time 5,1 ms
8DR1-P5-1100 kV50 kA
Test at KEMA, Arnhem , February / April 2008
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UHV - Circuit-Breaker 1200 kV
Testing: Dielectric performance
Withstand voltage tests
Lightning impulse voltage
- phase to earth 2400 kV- across open cb 2400 + 630 kV
Switching impulse voltage
- phase to earth 1800 kV
- across open cb 1675 + 900 kV
Power-frequency voltage
- phase to earth 1100 kV
- across open cb 1180 + 320 kV
8DR1-P5-1100 kV50 kA Prototype
Test at FGH, Manheim , July / August 2008
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1200 kV AC Current Transformers
Solutions: SF6Free-standing or Ring-core CB-solution
Current
Transformer
Main parameters
Rated voltage 1200 kV
Rated current 5000 A
Lightning impulse voltage 2400 kV
Switching impulse voltage 1800 kV
Power-frequency voltage 1215 kV
Composite insulators
Creeping distance 25 mm/kV
Overall height 11,3 m
Weight 4.240 kg
Ring-core CB-solution
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Copyright Siemens AG 2009. All rights reserved.
1200 kV AC Capacitive Voltage Transformer
Requirements and Technical Data
1100kV CVT Prototype running in
Wuhan UHV AC testing base
Main parameters
Rated voltage 1200 kV
Rated current 5000 A
Lightning impulse voltage 2400 kV
Switching impulse voltage 1800 kVPower-frequency voltage 1200 kV
Capacitance 2000 pF
Creeping distance 25 mm/kV
Overall height 11,6 m
Weight 2450 kg
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Solutions for 1200 kV AC Substations
Conclusions
UHV substations are important node-points in the power supply and
distribution with a need of high reliability and high availability.
Standards for the UHV level are under consideration, but not available
today.
The switchgear systems and equipment presented here for UHV are tailormade to the customers needs.
A simple copying and scaling up from the system levels below is not
always possible for the dimensions and parameters,
but
the basic knowledge of technologies and designs can be adapted from
the experience with
800 kV DC systems and with
800 kV and 1100 kV AC systems.
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Thank you, for your attention
International UHV Symposium
New Delhi, 29. January 2009
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Copyright Siemens AG 2009. All rights reserved.
Circuit Configurations
Arrangement is simple and clear
Acceptable costs
Busbar maintance with
shut down of the feeders
Unrestricted and non-stopoperation of all feeders in 2 groups
2 BBDouble Busbar Configuration
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Copyright Siemens AG 2009. All rights reserved.
Circuit Configurations
Circuit scheme and arrangement not clear
Expensive design
High availability
Selective Fault clearing with interuption of operation, if both busbars underoperation
1 Breaker Configuration
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Page 19 UHV Symposium, New Delhi, 29.01.2009 Energy SectorTransmission DivisionCopyright Siemens AG 2009. All rights reserved.
Circuit Configurations
Expensive design
High availability
Selective Fault clearing with interuption
of operation
2 Breaker Configuration
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Page 20 UHV Symposium New Delhi 29 01 2009 Energy Sector Transmission DivisionCopyright Siemens AG 2009. All rights reserved.
1200 kV Circuit Configurations
Comparison
2 Breaker
Configuration
1 Breaker
Configuration
Double Busbar
Configuration
Arrangement Clear arrangement
High space requirement
because of double number of
CB and DS
Arrangement not so clear
Higher space requirement
due to 3rd CB per 2 feeder
Arrangement is simple and
clear
Acceptable space
requirement
Operation Highest availability
Uninterrupted supply by
failing of 1 busbar
Uninterrupted supply during
CB maintenance
High availability for radialcircuit, only few meshes
Uninterrupted supply by
failing of 1 busbar
Uninterrupted supply during
CB maintenance
High availability andflexibility for meshed
networks
Uninterrupted supply by
failing of 1 busbar with
coupler bay
Interrupted power supply
during maintenance of CB
Cost Expensive design
Redundancy of CB and
related DS per bay
Expensive design
Additional CB per diameter
Busbar current = bay current
Acceptable costs
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