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 GE’s Network Transformers are constructed to provide economy, flexibility & reliability for network systems and meet stringent underground installation requirements. GE’s Network Transformers are designed to supply power to the network bus and handle significant short-term overload. Cities rely on General Electric Network Transformers to provide reliable and dependable electrical service to their customers.
Network systems are designed based on redundant facilities so that any single equipment failure will not result in service outage on the network. Network transformers typically supply power to secondary grid-type systems in densely populated cities. The transformers are designed for submersible operation but are also frequently used in dry vaults or inside buildings. Vault-type transformers are designed for occasional submersion and Subway type transformers are designed for frequent or continuous submerged operation. A Commercial Subsurface Transformer (CST) is similar to a Pad-type transformer but is designed for continuous (subway) and occasional (vault) submersion.
Each network is served by at least two primary feeders and the network unit consists of a high-side disconnect or grounding switch, a network transformer, and a network protector (with master relay, phasing relay, and fuses). The primary network voltage classes range from 5 kV to 35 kV. Typical 3-phase network transformer sizes are 300, 500, 750, 1,000, 1,500, 2,000, and 2,500 kVA. The transformers are liquid-filled with a variety of insulating fluids. The transformer impedance typically ranges 4%–7% but other impedances are possible.
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- Metropolitan Underground Networks
- Government, Commercial and Institutional Facilities
- Office Towers and Skyscrapers
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- High Rise Apartment Buildings
- Sporting Venues
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- Three-phased, 300-2500 kVA
- HV up to 35 KV with taps as an option
- Liquid filled – Mineral Oil, Environmental/vegetable type, Silicone
- Low voltage ranges from 208V through 5 kV
- Available Temp Rise is 55/65°C or 65°C
- 60 or 50 Hertz
- Highly Reliable providing years of service operating in harsh conditions
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- High Short-Circuit Strength
- Meet or exceed DOE 2010 efficiency standards
- Working towards DOE 2016 efficiency standards
- Organic zinc epoxy primer and polyurethane top coat for superior corrosion protection
- Tank and cooling panels available in copper bearing carbon steel (standard) or stainless steel ( 304 or 316)
- Patented high fault energy tank design (optional)
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- Network – ANSI/IEEE C12.57.40
- CST - ANSI/IEEE C12.57.24
- 1 – As defined in IEEE standard C57.12.80
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Transformers 
