High-Voltage Substation Design Services

Pythian Design provides complete substation design from preliminary design through construction support for voltage classes from 69kV to 345kV. Our services include collector substations for renewable energy projects, transmission taps, industrial facilities, and utility interconnections. Our technology-forward approach delivers faster, more accurate designs while maintaining full IEEE and NESC compliance.

Substation Types We Design

Distribution Substations: 69kV and 115kV substations serving local distribution networks.

Transmission Substations: 138kV, 230kV, and 345kV facilities for grid interconnection and bulk power transfer.

Collector Substations: Aggregating generation from wind farms, solar facilities, and BESS projects for utility interconnection.

Industrial Substations: Serving manufacturing plants, data centers, and processing facilities requiring high-voltage power.

Switchyards: Air-insulated (AIS) and gas-insulated (GIS) configurations for space-constrained sites.

High-voltage substation infrastructure at dusk

Standards & Compliance

• IEEE 80: Substation grounding design and analysis for personnel safety.

• IEEE 1584: Arc flash hazard assessment to determine PPE requirements and safety boundaries.

• IEEE C37 Series: Switchgear, protection, and control system standards.

• NESC (National Electrical Safety Code): Clearances, grounding, and safety requirements.

• NEC (National Electrical Code): Where applicable for building systems and low-voltage equipment.

• Utility Interconnection Requirements: Coordination with utility-specific standards and protection schemes.

What We Deliver

•Preliminary Design: Single-line diagrams, equipment selection and specifications, site layout and arrangement drawings, preliminary cost estimates

•Engineering Studies: Load flow analysis, short circuit analysis, grounding study (IEEE 80), arc flash study (IEEE 1584), protection coordination, relay settings

•Detailed Design: Three-line diagrams and control schematics, protection and control logic, AC/DC auxiliary systems, SCADA integration specifications, structural design coordination

•Construction Documents: Equipment specifications, installation drawings, bill of materials, construction notes and details

•Construction Support: Submittal review, RFI responses, commissioning support, as-built documentation

Why Choose Pythian Design

Faster Delivery: Our technology-enabled workflows deliver preliminary designs and studies 30-50% faster than traditional design firms.

Technical Depth: Licensed Professional Engineers with extensive EPC project experience across all voltage classes.

Code Compliance: Deep expertise in IEEE and NESC requirements ensures first-time approval from utilities and authorities having jurisdiction.

Practical Designs: We understand constructability and field realities, producing designs that can actually be built efficiently.

Related Services

69kV Substations 138kV Substations 230kV 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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