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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2/20Page 2 UHV Symposium, New Delhi, 29.01.2009 Energy SectorTransmission DivisionCopyright Siemens AG 2009. All rights reserved.

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


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


Circuit Configurations

1 Breaker Configuration


Recommended solution:

more

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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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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


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 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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14/20Page 14 UHV Symposium, New Delhi, 29.01.2009 Energy SectorTransmission Division

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 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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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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Circuit scheme and arrangement not clear

Expensive design

High availability

Selective Fault clearing with interuption of operation, if both busbars underoperation


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Page 19 UHV Symposium, New Delhi, 29.01.2009 Energy SectorTransmission DivisionCopyright Siemens AG 2009. All rights reserved.


Expensive design

High availability

Selective Fault clearing with interuption

of operation


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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


failing of 1 busbar

Uninterrupted supply during

CB maintenance

High availability andflexibility for meshed

networks


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

Siemens 1200kV

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