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Unrestricted © Siemens AG Österreich 2016. All rights reserved. siemens.at/future-of-energy

Innovative Transformer SolutionsRené Wind, Global Technology Centre (GTC) for large power transformers, Weiz

Unrestricted © Siemens AG Österreich 2016. All rights reserved.

June 16, 2016 DI Rene Wind / EM TR LPT GTC ENG OFF STW

1

2

3 PRETACT – The Siemens transformer resilience concept

Alternative Insulation Liquids – At a glance

Siemens Transformers – Innovative Solutions

Agenda



Alternative Insulating Liquids

Challenges

Lower dieletric strength, higher viscosity& higher pour point, compatibility issues

Solutions

•Design adjustments,tailored coolingdesign

Benefits of alternative fluids

•Longer lifecycle, higher temperaturerise limits, reduced insurance premiums& therefore lower total cost of ownership

•Reaching a higher level of personalsafety

•Meet regulations regardingenvironment impacts

•Siemens provides proven equipmentwith appropriate designs

•Committees and publications onalternative insulating fluids

-IEC (TC10) and CIGRE (WG D1)

-Electric Today, Electra, ISH etc.



Reference ProjectHighbury Urban Substation

• National Grid 400kV cable replacementprogram across London

• Unique constraints of inner urban areas

• Innovative solutions required forenvironmental and social needs

• Requirement to reduce spacerequirements and impact onsurroundings



Highbury Urban SubstationProject Highlights

• Turn-key scope for SAGÖ Transformers Weiz, including transformers, coolersand heat recovery system

• Heat recovery system to utilize waste heat for loads ranging from no-load to 60%of rated load.

• Use of synthetic ester (MIDEL 7131) at a rated voltage of 400kV

• Cooling system noise level at full load of 30dB(A) @ 10m. Equivalent to soundpower level of 58dB(A)



Highbury Urban SubstationOverview

• Severely limited space, eliminated option to incorporate standard ONAN/ODAFtransformer with freestanding radiator bank

• Decision made to utilize oil/water/air cooling system to allow greater flexibility ofsite configuration

• Oil/water/air cooling system boasts advantage of facilitating capture of wasteheat generated by transformer

• Given the sensitivities of an urban substation site, requirement for use ofreduced fire hazard insulating liquid identified

• Radiated sound power level of cooling system to comply with extremely stringenturban planning requirements



Highbury Urban SubstationTransformer Details



Highbury Urban SubstationFactory Acceptance Testing & Main Data

First 400 kV/240 MVA unit in theworld with synthetic esterRatio: 240 MVA 400/132/13 kV

Design insulation level

AC induced: 462 kV

Lighting impulse: 1425 kV

Switching impulse: 1050 kV

OLTC: MR VRC

Total weight: ≈ 230 tons

Liquid mass total: ≈70 tons



Resilient solutions for all modules and functions

Bullet Resistance

Financing

Tank Rupture Safe

Alternative Fluids

Plug & PlaySpare Unit

DC Compensation

GIC Safe

Mod

ular

arch

itect

ure TLM ServiceConcept

Low Losses

Low Noise



Grid Resilience Concept PREVENT

Condition Monitoring

• Off-line advanced, on suspicious units

• On-line essential

• Bushing Monitoring



Grid Resilience Concept PROTECT

Bullets may penetrate the tank andcause a internal flashover in thewindings

• Internal flashovers

• Explosions and subsequent fire

• Others units maybe also affected

• Blackout of units on substations

• Damage to a Transformers windings

• Replacement time exceeds one year



Grid Resilience Concept REACT

The challenge

Waiting too long for a replacement unit

The solution

Modern flexible transformer unit

The customer benefits

Very flexible transformer

Used in various grid topologies

Easy to load and ship

Cost of outage are minimized

REACT-strategy is based on MobileResiliency Units



Ultra-Flexible TransformersCustomer Westar, Kansas, US

400 MVA (3 Phase)Multi-Ratio:

345/230kv, 345/138kv, 345kV/115kV,230/138kV, 230/115kV, TW 14.4kV

All plug in connectionsMV and LV terminals with Pfisterer plug inconnectionsAuxilary connections and cabinets areconnected with plug in connectionsAlternative cable connections for 138 and115 kV – increased flexibility



Ultra-Flexible TransformersCustomer Westar, Kansas, US

The design is based on a modular system withfollowing main components:• Main tank• Conservator• Cooling bank• Bushings• Cables

à Stainless steel lifting eyes and receptions formultiple use

àStainless steel bottom tank plate

All parts are stored in containers for quick availability



DI René WindOffer Engineering – Global Technology Centre

EM TR LPT GTC ENG OFF STW

Elingasse 3

8160 Weiz

Austria

Phone: +43 664 80117 16100

Email: [email protected]

siemens.at/future-of-energy

Thank you for your attention!

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