230kV Extra-High Voltage Substation Design

230kV substations represent the backbone of many regional transmission networks. Pythian Design provides complete 230kV substation design for transmission system reinforcement, large-scale generation interconnection, and utility switching stations. Our designs meet rigorous IEEE and NESC requirements with careful attention to clearances, insulation coordination, and protection schemes.

Applications & Complexity

230kV is classified as extra-high voltage (EHV), requiring larger clearances, specialized equipment, and more complex protection schemes compared to lower voltages.

Typical applications include transmission network switching stations, large generation plant interconnections (300+ MW), and major transmission line terminals.

Bus configurations at 230kV often use breaker-and-a-half or double-bus schemes for maximum reliability.

Both air-insulated (AIS) and gas-insulated (GIS) options are common, with GIS offering space savings for urban or constrained sites.

Standards & Compliance

• IEEE 80: Extensive grounding analysis required due to high fault currents.

• IEEE 1584: Arc flash hazard assessment for 230kV equipment.

• IEEE C37 Series: Dead-tank or live-tank circuit breakers, protective relaying coordination.

• NESC: Increased clearances and safety distances for EHV equipment.

• Insulation Coordination: BIL levels, surge arrester selection, lightning protection.

What We Deliver

•Preliminary design with equipment selection, single-lines, and site layouts

•Load flow and short circuit studies for system performance and equipment ratings

•IEEE 80 grounding study with extensive mesh grid design

•Arc flash analysis (IEEE 1584-2018) and PPE recommendations

•Protection coordination with utility transmission protection

•Detailed three-line diagrams, relay logic, and control schematics

•SCADA and communications integration specifications

•Full construction document package for contractor bidding

Why Choose Pythian Design

EHV Expertise: Our engineers have designed 230kV substations for major transmission projects and large-scale generation.

Utility Coordination: Deep understanding of transmission-level interconnection requirements and protection philosophy.

Technology-Enabled Efficiency: We deliver EHV designs faster while maintaining the rigor required at this voltage class.

PE-Stamped Deliverables: All designs sealed by licensed Professional Engineers for submittal to utilities and regulators.

Related Services

Substation Design Services 69kV Substations 138kV Substations 345kV Substations Grounding Studies Arc Flash Studies Protection & Coordination BESS Interconnection Fire Protection Design NFPA 13 Sprinkler Design NFPA 72 Fire Alarm Design ESS Fire Protection

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