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Products / Liquid-Filled Substation Transformers

Liquid-Filled Substation Transformer

Liquid-Filled Substation Transformers

OMEX liquid-filled substation transformers are custom-engineered for utility, industrial, renewable energy, data center, and infrastructure projects that require higher-capacity voltage transformation and dependable grid performance. Each design is tailored to the project one-line, voltage class, MVA rating, impedance, cooling, protection, monitoring, and site requirements.

Three-Phase Standard
Project-Specific Capacity
Project-Specific Voltage Class
ONAN / ONAF
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Overview

Substation transformers connect medium- or high-voltage sources to plant, campus, renewable, or distribution systems. Unlike catalog distribution units, these transformers are engineered around the project electrical study and specification. OMEX supports configuration development, drawings, technical review, accessories, testing, documentation, and delivery coordination for mission-critical applications. Final ratings and features are established through the approved project submittal.

Phase Display

Standard Configuration

Phase
Three-phase.
Capability Summary
Capacity and voltage class are project-specific and subject to approved submittal.
Typical Secondary
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4.16 kV through 34.5 kV, project-specific.
Cooling
ONAN or ONAN/ONAF.
Best Fit
Utility, industrial, renewable, data center, and infrastructure substations.

Special Configurations

Single-Phase
Do not show as a standard catalog selector unless OMEX confirms a dedicated offering.
Alternate Banks
Single-phase bank or special arrangements require engineering review.
Next Step
Submit One-Line & Specification.
Display Rule
Use a capability summary, not generic catalog SKUs.
Note
All data must come from an approved proposal or submittal.
Submit One-Line & Specification

Technical Specifications

Product TypeLiquid-filled, outdoor substation transformer.
PhaseThree-phase standard; special configurations by engineering review.
CapacityProject-specific capacity established through approved submittal.
Primary Voltage ClassProject-specific voltage class established through approved submittal.
Secondary VoltageProject-specific; common medium-voltage distribution outputs.
Frequency60 Hz; alternate frequency by project.
CoolingONAN or ONAN/ONAF; additional cooling stages by project.
Insulating FluidMineral oil or natural ester fluid, as specified.
WindingsCopper or aluminum, project-specific.
Tap ChangerDe-energized tap changer or on-load tap changer, as specified.
Impedance / BILProject-specific and coordinated with the system study.
Standards / TestingDesigned and tested to applicable IEEE C57.12.00, C57.12.90, and project requirements.

Typical capabilities shown. Final ratings and features are subject to the approved project submittal.

Available Accessories & Options

Protection / Control

  • De-energized or on-load tap changer
  • Bushing current transformers
  • Surge arresters and neutral grounding provisions
  • Pressure-relief and sudden-pressure devices
  • Control and marshalling cabinet

Monitoring / Cooling

  • Oil-level and winding/oil temperature indicators
  • Forced-air fan cooling stages
  • Online dissolved-gas or condition monitoring
  • Conservator or sealed-tank preservation system
  • Drain, filter, sampling, and filling valves

Applications

Utility substations
Industrial plants
Data center campuses
Renewable energy collector and interconnection systems
Mining, oil and gas, and heavy infrastructure
Large commercial and institutional campuses

Standards & Quality

Custom-engineered and tested to applicable IEEE and project requirements. Final capacity, voltage class, impedance, insulation level, cooling, accessories, testing, dimensions, and shipping configuration are established through the approved technical specification and submittal process.

Ready To Review A Substation Transformer Requirement?

Submit your one-line and specification, talk to engineering, request a budgetary quote, or upload project documents for review.

Submit One-Line & SpecificationTalk To EngineeringRequest Budgetary Quote