Innovative Transformer Solutions René Wind, Global Technology Centre (GTC) for large power transformers, Weiz siemens.at/future-of-energy
Agenda 1 2 3 Siemens Transformers Innovative Solutions Alternative Insulation Liquids At a glance PRETACT The Siemens transformer resilience concept Page 2
Alternative Insulating Liquids Reaching a higher level of personal safety Meet regulations regarding environment impacts Siemens provides proven equipment with appropriate designs Committees and publications on alternative insulating fluids -IEC (TC10) and CIGRE (WG D1) -Electric Today, Electra, ISH etc. Page 3 Challenges Lower dieletric strength, higher viscosity & higher pour point, compatibility issues Solutions Design adjustments,tailored cooling design Benefits of alternative fluids Longer lifecycle, higher temperature rise limits, reduced insurance premiums & therefore lower total cost of ownership
Reference Project Highbury Urban Substation National Grid 400kV cable replacement program across London Unique constraints of inner urban areas Innovative solutions required for environmental and social needs Requirement to reduce space requirements and impact on surroundings Page 4
Highbury Urban Substation Project Highlights Turn-key scope for SAGÖ Transformers Weiz, including transformers, coolers and 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 sound power level of 58dB(A) Page 5
Highbury Urban Substation Overview Severely limited space, eliminated option to incorporate standard ONAN/ODAF transformer with freestanding radiator bank Decision made to utilize oil/water/air cooling system to allow greater flexibility of site configuration Oil/water/air cooling system boasts advantage of facilitating capture of waste heat generated by transformer Given the sensitivities of an urban substation site, requirement for use of reduced fire hazard insulating liquid identified Radiated sound power level of cooling system to comply with extremely stringent urban planning requirements Page 6
Highbury Urban Substation Transformer Details Page 7
Highbury Urban Substation Factory Acceptance Testing & Main Data Page 8 First 400 kv/240 MVA unit in the world with synthetic ester Ratio: 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 Modular architecture TLM Service Concept Bullet Resistance DC Compensation Financing Alternative Fluids Tank Rupture Safe Plug & Play Spare Unit GIC Safe Low Noise Low Losses Page 9
Grid Resilience Concept PREVENT Condition Monitoring Off-line advanced, on suspicious units On-line essential Bushing Monitoring Page 10
Grid Resilience Concept PROTECT Bullets may penetrate the tank and cause a internal flashover in the windings 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 Page 11
Grid Resilience Concept REACT REACT-strategy is based on Mobile Resiliency Units Page 12 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
Ultra-Flexible Transformers Customer 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 connections MV and LV terminals with Pfisterer plug in connections Auxilary connections and cabinets are connected with plug in connections Alternative cable connections for 138 and 115 kv increased flexibility Page 13
Ultra-Flexible Transformers Customer Westar, Kansas, US The design is based on a modular system with following main components: Main tank Conservator Cooling bank Bushings Cables à Stainless steel lifting eyes and receptions for multiple use àstainless steel bottom tank plate All parts are stored in containers for quick availability Page 14
Thank you for your attention! DI René Wind Offer Engineering Global Technology Centre EM TR LPT GTC ENG OFF STW Elingasse 3 8160 Weiz Austria Phone: +43 664 80117 16100 Email: rene-juergen.wind@siemens.com siemens.at/future-of-energy Page 15