1200 kV AC Substations - Products and Integrated Solutions International UHV Symposium New Delhi,...

1200 kV AC Substations -Products and Integrated Solutions

International UHV Symposium

New Delhi, 29. January 2009

Edelhard KynastSiemens AG, Energy

Page 2 UHV Symposium, New Delhi, 29.01.2009 Energy Sector – Transmission DivisionCopyright © Siemens AG 2009. All rights reserved.

Environmental conditions

Electrical Requirements

1200 kV AC SubstationBasic requirements - Example: PGCIL

Temperature (min / average / max) +4 ºC / 38 ºC / 50 ºC

Seismic Zone 1

Wind 47 m/s

Altitude <1000 m

Rated voltage 1200 kV

Rated current, feeder 5000 A

Rated frequency 50 Hz

Short-circuit current 50 kA / 1 s

Rated lightning impulse withstand voltage 2400 kV

Rated switching impulse withstand voltage 1800 kV

Creepage distance 25 mm/kV (Total 30000 mm)


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 SubstationBasic 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


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 SubstationCircuit Configurations

1 ½ Breaker Configuration

2 Breaker Configuration

Recommended solution:

more


1200 kV AC Substation Double Busbar arrangement - Layout

115,0 m 80,0 m 92,5 m

287,5 m

62,0

m62

,0 m

51,0

m


1200 kV AC SubstationDouble Busbar Arrangement - Layout

- Surge Arresters- Disconnectors- Dead Tank Circuit Breakers- Current Transformers- Capacitive Voltage Transformers


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


Designation 3EQ5 850-5PT95

Rated voltage 850 kVContinuous operating voltage 723 kVNominal discharge current 20 kALightning impulse protection level 1700 kVSwitching impulse protection level 1500 kVEnergy discharge capability 55 MJCreepage distance 35750 mm

(30 mm/kV)Height 12 mBending moment 150 kNm

1200 kV AC Surge Arresters Technical Data

Voltage-current characteristic of a MO surge arrester for 1200 kV AC power system


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 IndiaRecommendation for Double Side Break Design


1200 kV AC Disconnector Specified Requirements - Project Powergrid India

Technical parameters 1200 kV AC disconnector & earthing switch

Rated voltage 1200 kV Frequency 50 Hz Normal current 6000 AmpsShort time withstand current 50 kA / 1 s Peak withstand current 125 kALightning impulse withstand voltage - phase- to- earth 2400 kV - across isolating distance 2400 kV+685 kVSwitching 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


UHV - Circuit-Breaker 1200 kV Testing: Short circuit performance

T100a (February 2008)Full pole testTime constant 120 msValue of last current loop 115 kAFirst pole to clear factor 1,3 p. u.TRV peak value 1600 kVMinimum arcing time 10,3 ms

T10 (April 2008)Full pole testFirst pole to clear factor 1,5 p. u.TRV peak value 2062 kVMinimum arcing time 5,1 ms

T100a (February 2008)Full pole testTime constant 120 msValue of last current loop 115 kAFirst pole to clear factor 1,3 p. u.TRV peak value 1600 kVMinimum arcing time 10,3 ms

T10 (April 2008)Full pole testFirst pole to clear factor 1,5 p. u.TRV peak value 2062 kVMinimum arcing time 5,1 ms

8DR1-P5-1100 kV – 50 kA Test at KEMA, Arnhem , February / April 2008 8DR1-P5-1100 kV – 50 kA Test at KEMA, Arnhem , February / April 2008


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

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 kV – 50 kA PrototypeTest at FGH, Manheim , July / August 2008 8DR1-P5-1100 kV – 50 kA PrototypeTest at FGH, Manheim , July / August 2008


1200 kV AC Current TransformersSolutions: SF6 – Free-standing or Ring-core CB-solution

Current

Transformer

Main parameters

Rated voltage 1200 kVRated current 5000 A

Lightning impulse voltage 2400 kV

Switching impulse voltage 1800 kVPower-frequency voltage 1215 kV

Composite insulatorsCreeping distance 25 mm/kV

Overall height 11,3 mWeight 4.240 kg

Ring-core CB-solution


1200 kV AC Capacitive Voltage TransformerRequirements and Technical Data

1100kV CVT Prototype running in 1100kV CVT Prototype running in Wuhan UHV AC testing baseWuhan UHV AC testing base

Main parameters

Rated voltage 1200 kVRated current 5000 A

Lightning impulse voltage 2400 kVSwitching impulse voltage 1800 kVPower-frequency voltage 1200 kVCapacitance 2000 pF

Creeping distance 25 mm/kV

Overall height 11,6 mWeight 2450 kg


Solutions for 1200 kV AC SubstationsConclusions

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 tailor made 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.

Thank you, for your attention

International UHV Symposium

New Delhi, 29. January 2009


Circuit Configurations


Acceptable costs

Busbar maintance with shut down of the feeders

Unrestricted and non-stop operation of all feeders in 2 groups

2 BB – Double Busbar Configuration



Circuit scheme and arrangement not clear

Expensive design

High availability

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




Expensive design

High availability

Selective Fault clearing with interuption of operation



1200 kV Circuit ConfigurationsComparison



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


Acceptable space requirement

Operation Highest availability

Uninterrupted supply by failing of 1 busbar

Uninterrupted supply during CB maintenance

High availability for radial circuit, only few meshes

Uninterrupted supply by failing of 1 busbar

Uninterrupted supply during CB maintenance

High availability and flexibility 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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