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8.5.1.8 Electrical Equipment Locations
The generator transformer, the unit auxiliary transformer and the generator circuit breaker are installed outdoors.
Electrical panel and batteries are mostly installed in standardized, prefabricated housings – the Power Control Centres (PCC) or in electrical buildings. PCCs are mainly used for feeding the GT/ST auxiliary services
Main advantages for using PCCs are:
– Basic pre-commissioning of the electrical and main DCS equipment
– Minimization of transportation risks due to a special dispatch of the complete PCC modules
– Shortened final commissioning and on time start-up at site
– Modular design
– No intermediate site storage for equipment required
– The features of the PCC modules as described below make them equivalent to a conventionally erected housing/building:
– The degree of protection of the switchgear rooms will be according NEMA as required.
– The switchgear room temperature in the PCC modules is controlled with air-conditioning units.
– The air is cleaned with a filter. Any ingress of moisture or dust by leakage is prevented by the sealed construction. Additionally the heat exchangers dehydrate the replacement air so that condensation inside the modules cannot occur.
– Cables enter from the bottom of the PCC modules through cable glands.
The Low Voltage Transformers are installed outdoors at a location adjacent to the electrical building or electrical module.

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