Solar Skid Substation

A high-performance, factory-integrated power block engineered for utility-scale solar generation. UTEC's Solar Skid Substation transforms complex solar-plant interfaces into one streamlined, project-ready solution, addressing harmonic-rich currents and voltages, transient over voltages, significant load variation, reactive power requirements, and reverse power flow. It brings medium-voltage switching, an inverter-duty transformer, low-voltage distribution, protection, control, communications, auxiliary systems, and internal interconnections together on a common skid.

Key Product Features

One Integrated Solar Power Block

Medium-voltage switching, inverter duty transformer, 400 V to 800 V LV MDB, protection, control, communications, auxiliaries, and internal connections are engineered as one coordinated package for a cleaner project interface.

Solar-Duty Transformer Engineering

The transformer is rated up to 8 MVA at 33/0.8 kV or 13.8/0.8 kV and uses an enhanced insulation system with withstand capability against harmonics generated by solar inverters.

RMU Choice for Every Digitalization Strategy

The skid can be equipped with Enerswit+ Conventional, SMARTEC, or SMARTEC Special Use RMUs, allowing the MV architecture to be aligned with the project's operational, automation, monitoring, and application requirements.

Advanced Protection and Plant Communication

Coordinated protection and control across the RMU, transformer, and MDB supports a connected power block with communication capability to the plant DCS or SCADA system.

Flexible 400 V to 800 V LV Architecture

While 800 V is the common voltage for modern utility-scale solar inverter applications, the LV MDB can be engineered from 400 V up to 800 V to match the inverter topology, feeder arrangement, protection philosophy, metering requirements, and approved project design.

Flexible Skid and Enclosure Engineering

The mechanical arrangement, enclosure concept, ventilation, access, and environmental protection can be optimized to suit the project specification and site conditions.

Factory-Integrated for Faster Deployment

A common skid, coordinated interfaces, and pre-engineered internal connections minimize site integration complexity and support consistent installation quality.

Proven Performance

Transformer Up to 8 MVA

Inverter duty transformer capability up to 8 MVA for high-capacity renewable generation blocks. K-rated design for harmonic-loaded solar applications with higher thermal and dielectric insulation margins.

33 kV / 13.8 kV MV Interface

RMU and transformer arrangements for 33 kV systems, with 13.8 kV available for project-specific applications.

400 V to 800 V LV Flexibility

800 V is the common solar application voltage, with engineered LV solutions available from 400 V up to 800 V to suit the selected inverter platform and project architecture.

Designed for Solar Electrical Stress

Transformer design measures address harmonics, transient overvoltages, load variation, reactive loading, and reverse power flow.

DCS / SCADA Connectivity

Integrated protection and control can communicate with the plant supervisory and control platform.

Three RMU Platforms

Available with Enerswit+ Conventional, SMARTEC, or SMARTEC Special Use RMU platforms to match the required operational and automation philosophy.

Technical Data

General Specification

Product

Solar Skid Substation (SSS)

Application

Utility-scale solar PV and renewable-energy power blocks

MV System Voltage

33 kV standard; 13.8 kV project-specific

Maximum Equipment Voltage

Up to 36 kV, project dependent

Transformer Rated Power

Up to 8 MVA

Transformer Insulation Methods

Mineral oil, silicon oil, and ester oil

Transformer Voltage Ratio

33/0.8 kV or 13.8/0.8 kV

Transformer Type

Oil-immersed inverter-duty transformer

LV System Voltage

400 V to 800 V; 800 V is common for utility-scale solar applications

Core Equipment

Enerswit+ RMU + inverter duty transformer + LV MDB

Protection & Control

Integrated across RMU, transformer, and MDB

Plant Communication

DCS / SCADA communication capability

RMU Options

Enerswit+ Conventional; SMARTEC; SMARTEC Special Use

Skid / Enclosure Concept

Project-specific mechanical arrangement and environmental protection

Design Basis

Project-specific rating, load profile, impedance, inverter connection, environmental and protection requirements

Note

Final ratings, enclosure protection, communication protocols, cooling, dimensions, and equipment configuration are confirmed against the approved project specification and design review.