Distribution Substation Design Services
Draftech delivers construction-ready design packages for new distribution substations and expansions. One in-house engineering team coordinates the drawings and specifications around your utility's requirements.
Distribution substation design services from one accountable team
Draftech provides distribution substation design services for investor-owned distribution utilities, rural electric cooperatives, municipal utilities, EPCs and developers. We bring the station's physical arrangement and equipment requirements into a coordinated construction package, with engineering performed entirely in-house. Draftech's substation engineering design services cover physical layout drawings, grounding design drawings, equipment specifications for transformers, switchgear, breakers and bus, and protection and control panel layouts, schematics and wiring diagrams built on owner-supplied settings. You have one accountable design team to resolve conflicts between drawings before those conflicts become field decisions.
A substituted transformer's footprint or terminal location can conflict with the bus and layout drawings. A grounding grid drawn for an earlier arrangement can miss connections to new equipment. Panel wiring diagrams and schematics can use settings never confirmed against the equipment on site. When those discrepancies reach construction, the consequences include inspection failures, field rework and a delayed energization date. The drawing fee is only one part of the cost; rebuilding installed work and rescheduling the project can reach far beyond it.
This service sits within Draftech's broader electric utility engineering practice, with a defined scope for the distribution substation and clear interfaces to the feeders leaving it.
Establish the design basis before producing drawings
At intake, we review the available site and existing-system information with the owner. For a new station, that means establishing the site constraints and intended arrangement. For an expansion, it also means identifying what stays, what changes and where the proposed work connects to existing equipment.
The starting package should include:
- Site survey information, property limits and access constraints.
- Existing station drawings and records of modifications, where applicable.
- Utility design standards, preferred equipment requirements and drawing conventions.
- Available equipment documentation and information on owner-furnished equipment.
- Defined project limits, feeder interfaces and owner review responsibilities.
We log missing or conflicting inputs and send them to the owner for resolution before using them in a drawing. An existing plan may show a different equipment arrangement from the current site record. We document the owner's confirmed direction and incorporate it into the affected drawings, so the construction contractor receives the resolved arrangement.
Physical layouts and equipment specifications developed together
Draftech develops the layout alongside specifications for transformers, switchgear, breakers and bus so that the equipment requirements and drawings describe the same installation. We account for equipment dimensions, connection points, access and the relationship between the station's components.
We coordinate specifications against the owner's standards and supplied design criteria. Equipment documentation feeds back into the arrangement as details become available. If a proposed selection changes a footprint or connection location, we review the affected design sheets together. A specification revision should not leave a conflicting dimension on the layout that the contractor will use.
That gives your engineers and your contractor one consistent basis for equipment review and construction planning. It also makes questions easier to route: the team responsible for the specification can evaluate its consequences for the physical design without handing that decision to an unrelated design vendor.
Grounding design uses owner-supplied study data
Draftech develops the grounding design from the fault-current and study data supplied by the owner.
The grounding drawings coordinate the grid arrangement and equipment grounding connections with the physical layout. An expansion requires attention to the relationship between existing and proposed grounding, including the available records of the installed system. A layout change can affect that relationship, so we update the associated drawings together.
Draftech does not generate the fault-current or power-system study data behind the grounding design; we confirm the owner's inputs match the station configuration before grounding drawings start.
Protection and control drawings follow supplied settings
Draftech produces protection and control design drawings, including panel layouts, schematics and wiring diagrams, around criteria and settings provided by the utility or its protection engineer. The drawings document the specified arrangement and connections. The owner provides settings and criteria verified by its responsible protection engineer for the intended installation; Draftech does not calculate the settings or independently establish the protection scheme through a study.
The distinction matters when existing records, equipment information and supplied settings disagree. Carrying a conflicting input into a new drawing does not resolve it. We identify the discrepancy for the utility or its protection engineer, then incorporate the confirmed direction into the affected documents.
Reviewing consistency across the drawing package is design QA/QC, not validation of system performance. Draftech serves as the substation design consultant, and studies stay with the owner's protection engineer.
Expansion design starts with the existing installation
Draftech's substation expansion design services start with the retained installation and its interfaces with proposed equipment. A new component can fit within the available area while creating a conflict at an existing connection or access path. We show the proposed work in relation to the retained installation, with the limits of each clearly identified.
Draftech reviews existing records alongside the proposed scope to establish those interfaces. We trace the proposed equipment connections into the existing bus and grounding records, identifying where the expansion depends on information about the retained installation and referring gaps or conflicting records to the owner before incorporating those connections into the design. The expansion sheets show removals and retained equipment alongside the proposed arrangement, so the owner's reviewer can follow how each change affects the existing installation. We mark the authorized scope boundary on each drawing and keep the equipment references on the physical layout and grounding sheets consistent with each other. Grounding design for the expansion uses owner-supplied fault-current and study data; Draftech does not perform load flow, short circuit, arc flash, protection coordination, relay-setting or interconnection studies.
This coordination helps keep a revision to the expansion from inadvertently changing documentation for equipment outside the authorized scope.
QA/QC and construction package delivery
Before delivery, Draftech reviews the design package for consistency across drawings, specifications and the owner's documented requirements. We check that equipment identifiers, dimensions, connection references and revision status agree across the package. Resolving a comment on one sheet includes checking its effect on the related documents.
The construction-ready package brings the agreed design scope together for the owner's review and use by its builder. The objective is a package that communicates what belongs in the installation, where it belongs and how the design documents relate.
The substation is built by the owner's crews or the owner's contractor. Draftech can provide electric construction management and inspection for that build. Draftech does not build substations or provide testing, commissioning or energization services.
Coordinate the station boundary with feeder design
We define the handoff from the substation package to the distribution circuits leaving it. Draftech's overhead distribution design and underground distribution design services address those feeder scopes. Establishing the interface keeps station drawings and line drawings from assigning different requirements to the same connection.
Beyond the station project, recurring line extensions and new services on those feeders belong in distribution work-order design.
Distribution Substation Design Services FAQ
Can Draftech design both a new distribution substation and an expansion?
Yes. Draftech provides in-house design for new distribution substations and expansions of existing stations. Expansion work starts with the retained installation, available records and the interfaces affected by the proposed equipment.
What should we provide to scope the project?
Send the available site information, existing drawings, utility standards, equipment requirements and description of the proposed work. Identify the owner reviewers and any known gaps in the records. Draftech uses that information to define the design deliverables and the inputs needed to complete them.
Does the design package include power-system studies or relay settings?
No. Draftech does not perform load flow, short circuit, arc flash, protection coordination, relay-setting or interconnection studies. Protection and control drawings use utility-supplied or protection-engineer-supplied criteria and settings, while grounding design uses owner-supplied fault-current and study data.
Who builds the substation after design is complete?
The owner's crews or the owner's contractor build it, and Draftech can provide construction management and inspection of that build. Testing, commissioning and energization stay with the owner's team.
Is the engineering performed in-house?
Yes, Draftech's engineering is 100% in-house. That gives the owner one accountable team for the design and for resolving drawing-package comments. Required owner inputs remain clearly assigned throughout the design process.
Put your distribution substation scope in front of our team
Bring the site information, proposed equipment changes and utility requirements to Draftech. We will define the design package, clarify the interfaces and identify the owner inputs needed to move the work forward. Contact our engineering team to discuss your new station or expansion.
info@draftech.com | 305-306-7407 | Miami Lakes, FL