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® WorleyParsons <br /> resources&energy <br /> 4.0 ELECTRICAL DESIGN CRITERIA <br /> This section describes the facility's principal electrical equipment and systems, their <br /> functions, and the general criteria upon which their design will be based. An overview is <br /> shown on the main single-line diagram. <br /> 4.1 Interconnections to Electrical Utilities <br /> Power generated will be delivered to the utility transmission system through a 230kV <br /> breaker on the high voltage side of each generator step-up transformer Startup power will <br /> be backfed through this same interconnect from the utility system. Protection, control and <br /> communication interface will be at the utility plant fence line. <br /> 4.2 Electric Power System — General <br /> Power will be generated by a single Combustion Turbine Generator (CTG) and a Steam <br /> Turbine Generator (STG). A single 3-winding generator step-up transformer will step up <br /> the voltage from each generator for connection to the utility high voltage system. The CT <br /> generator will be connected to an 18kV generator breaker with isolated phase bus duct. The <br /> line side of the generator breaker will then be connected to the Generator Step Up <br /> Transformer (GSUT) via isolated phase bus duct. The ST generator will also be connected <br /> to a generator breaker and the line side of that breaker will be connected directly to the <br /> GSUT via underground cable. The HV side of the GSUT will be connected to the existing <br /> 230kV switchyard via overhead HV cable. <br /> The following general criteria will be used to design the electrical system: <br /> • The electrical systems, equipment, materials, and their installation will be designed in <br /> accordance with applicable industry codes and standards, project design criteria, and <br /> other requirements as specified. <br /> • Facility power will be supplied through two (2) 18kV-4.36kV unit auxiliary <br /> transformers connected to the 4.16kV switchgear. Emergency power will be provided <br /> by connection to a 12kV line currently in place at the existing plant. This connection <br /> will be made into a 480V switchgear via a 12kV-480V transformer. During normal <br /> startup, power required for auxiliaries will be supplied from the utility through the CT <br /> generator step-up transformer to the medium voltage (MV)unit auxiliary transformers. <br /> • The 4160V system will be fed from the MV unit auxiliary transformers. Each of the <br /> 4160V switchgears will be double-ended, low-resistance grounded, and located in a <br /> separate Power Distribution Centers (PDC). <br /> • The 480V system will be fed from 4.16-480kV secondary unit substation transformers. <br /> Each 480V low-voltage switchgear will be double-ended and high-resistance grounded. <br /> The 480V motor control centers will be fed from the 480V low-voltage switchgear. <br /> Lodi Energy Center 3.4- 1 LEC AFC <br /> 071608 Rev.A <br />