69kV Substation Design Services

69kV is a common distribution voltage class used throughout North America. Pythian Design provides complete 69kV substation design for distribution systems, small renewable collector substations, and industrial facilities. Our designs meet all IEEE and NESC requirements with efficient layouts and practical equipment selection.

Typical 69kV Applications

Distribution Substations: Stepping down from transmission voltage (115kV, 138kV) to 69kV for local distribution networks.

Collector Substations: Aggregating generation from smaller wind or solar facilities (typically under 100 MW).

Industrial Substations: Serving manufacturing plants, processing facilities, and large commercial loads.

Utility Taps: Distribution taps from higher voltage transmission lines.

Design Considerations for 69kV

Clearances and spacing are more compact than higher voltages, making 69kV suitable for space-constrained sites.

Equipment ratings typically include circuit breakers with 25kA to 40kA fault current capability.

Bus configurations commonly include single bus, ring bus, or breaker-and-a-half depending on reliability requirements.

Grounding design per IEEE 80 is critical for personnel safety during fault conditions.

Lightning protection includes shield wires, surge arresters, and proper grounding.

Standards & Compliance

• IEEE 80: Grounding study to ensure safe touch and step voltages.

• IEEE 1584: Arc flash analysis for worker safety and PPE requirements.

• NESC: Clearances, construction standards, and safety requirements.

• IEEE C37 Series: Protection and control equipment standards.

What We Deliver

•Single-line diagrams with equipment ratings and protection schemes

•Site layout drawings showing equipment arrangement and clearances

•Grounding study (IEEE 80) with grid design and calculations

•Arc flash study (IEEE 1584-2018) with incident energy labels

•Protection coordination study with relay settings and TCC diagrams

•Three-line diagrams and control schematics

•Equipment specifications and bill of materials

•Construction drawings and installation details

Why Choose Pythian Design

Fast turnaround on 69kV designs with our streamlined workflows.

Extensive experience with utility interconnection requirements and approval processes.

Practical equipment selection that balances cost, reliability, and constructability.

PE-stamped drawings accepted by utilities and AHJs nationwide.

Related Services

Substation Design Services 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

Ready to Start Your Project?

Request a Consultation