Liquid Filled Transformers - Virginia Transformer Corp

Liquid-Filled Transformers for Precisely Your Application

Full Range of Liquid-Filled Transformers

Virginia Transformer manufactures a full range of liquid-filled transformers from 500 kVA to 1,400 MVA up to
500 kV class, from 45º C rise to 65º C rise.

On-Load Tap Changing (OLTC) Transformers
Tap Changer Types:

Virginia Transformer offers resistive-type OLTC or reactive-vacuum-type systems. We will custom engineer your transformer with the OLTC switch connected on the high-or low-voltage winding according to your specifications.

OLTC transformer, available up to 500 MVA

Three-Phase Voltage Regulators

Virginia Transformer voltage regulators are used in distribution applications throughout North America to maintain voltage over transmission lines.

Virginia Transformer Three-Phase Voltage Regulators up to
OLTC transformer, available up to 500 MVA 50 MVA throughput and 69 kV

Virginia Transformer Liquid-Filled Transformers:

Powering Industrial, Commercial, and Utility Operations Throughout North America

Engineered and Custom Built to Your Precise Requirements

Our expert sales team helps you specify your individual transformer requirements. Our engineering and manufacturing staff transforms your specifications into a unique, top quality, efficient, and long-life solution for your application. Virginia Transformer will customize units for special requirements. Common options and accessories are available for system protection, reliability and hassle-free maintenance.

Virginia Transformer brings more than 50 years of transformer engineering experience to each new assignment. We have amassed an archive of more than 15,000 designs and test data, serving as an exclusive resource for the development of new solutions . . . perhaps yours.

Virginia Transformer liquid-filled transformers are integral to industrial, commercial, and utility operations, but don’t let that limit your thinking. We build custom units for specialty segments such as mining, transit, oil & gas, marine, government, data centers, storage facilities, and export markets.

Think about your precise requirements. We do.

Circular Coil Windings for Short-Circuit Stability

Virginia Transformer uses disc and/or helical winding types for both HV and lV windings, using either copper or aluminum conductors, as specified. Windings are made in temperature and pressure-controlled environments. We typically provide circular coils, which are more stable than rectangular coils and can better withstand short-circuit forces.

Rectangular coils tend to become circular when exposed to strong short-circuit conditions; this transformation can lead to internal damage.

Core-Stacking Configurations to Optimize Cost, Losses, and Sound Levels

Virginia Transformer engineers select from a variety of core-lamination materials based on your specifications that are made from high-grade, grain-oriented silicon steel to optimize cost, losses, and sound levels.

Virginia Transformer uses mitered-joint and/or step-lap core construction with an appropriate grade of cold-rolled, grain-oriented silicon steel laminations for optimum efficiency.

Choice of Oil Preservation Systems

Virginia Transformer offers three types of oil preservation systems based on your specification for liquid-filled transformers: sealed tanks, conservators and automatic (nitrogen) positive-pressure systems.

Conservator tanks are custom designed primarily for environments with extreme variations in ambient temperatures, most often in severe cold and winter climates.

VCM Transformer Monitoring and Diagnostic Module connects through the internet remotely for a real-time view of transformer conditions.

VCM (Virginia Control Module) Transforms Control and Management

Monitor your transformer’s performance remotely with wired (Modbus, DNP3 and Fiber) or wireless connection VCMs from Virginia Transformer. The VCM is a proprietary PLC-based monitoring and diagnostic module to track and record top oil temperature, winding temperature indicator, gas pressure, rate-of-rise pressure, and liquid level. The device sends real-time, solid-state contact outputs, and data to supervisory controls. VCM analyzes and detects abnormal conditions and provides data for trend analysis and historical review.

Equipped For Heightened Performance

Virginia Transformer Standard Features

Range

Loading

Service

Basic Impulse Level (BIL)

Impedance

Coils

Cooling Fluid

Fluid Preservation System

Cooling Radiators

Gauges and Accessories

Liquid-temperature gauge
Liquid-level gauge
Vacuum-pressure gauge
Drain valves
Filter press connections (top and bottom)
Automatic pressure relief device
Control wiring for indoor/outdoor

Paint

Nameplate

Bushings

Removable manhole covers

Provisions on base for skidding

Custom Options

Nitrogen supply for oil preservation
Reconnectable windings
Non-standard impedance
High-performance paint in your choice of color
Demountable radiators with isolation valves
Stainless steel radiators
Air terminal throats and chambers
Explosion-proof control box

Sloped or dome top cover
Multi-stage fan cooling for increased MVA
Thermally upgraded insulation system 120º C
Customer-specific controls and relays
Stainless-steel junction box
Less-flammable fluids – natrual and synthetic ester
Low-temperature oils – l suminol
Control wiring – rigid, or flexible conduits

Fluid Choices

Virginia Transformer uses natural and synthetic esters to lower the risk of fire or explosion in equipment located indoors or near buildings or hazards. Natural and synthetic esters are less-flammable transformer fluids that provide an even greater flash/fire point and are biodegradeable to lessen the impact on the environment.

Engineered for Your Precise Requirements

Custom engineeering is our calling card at Virginia Transformer. We provide more than a dozen transformer types for industrial, commercial and utility operations plus variations for mining, cement, marine, export, transit, oil & gas, government facilities and data center specialities. Our engineering strength extends to every discipline of transformer design including electrical, mechanical, thermal and materials engineering.

The design and engineering process at Virginia Transformer is ISO-9001-2015 Certified and delivers quality assured transformers for customer applications demanding performance, efficiency and long-life at the lowest possible cost.

Controlled Environments

Shortest Industry Lead Times

Linked design, engineering, and manufacturing systems help us produce and deliver custom-built transformers with the industry’s shortest turnaround times for both drawing submittals and production.

Commitment to Customer Satisfaction

Each transformer is installed under the watchful eye of our Customer Service Center. They will know the status of your transformer project at every stage of production from start to finish. You will have your own single point of contact for contracts and logistics. You will be kept informed and up to date. Your total satisfaction is both our goal and commitment.

Test Proof

Virginia Transformer performs complete, in-house production
testing per ANSI C57.12.90 and customer specifications as
applicable, including:

Other testing facilities are available including

Virginia Transformer On-Load Tap Changer (OLTC) Solutions

Individualized Solutions for Precisely the Transformer You Need

Virginia Transformer designs OlTC transformers for your specific application. Resistive-type or reactive-vacuum-type systems are available. You can configure your transformer with the OLTC connected on the high-or low-voltage winding, depending on your application.
A tap range of +/- 10 percent in 5/8 percent increments is typical, but increased adjustment ranges and incremental steps are available, as directed by your requirements.

Control System Alternatives to Fit Your Operations

Virginia Transformer offers local or remote, automatic or manual control systems for single or multiple (parallel) applications. line monitoring, time delays, supervisory control and interfaces are available as required.

Additional opitons are available for this application, including remote indication of tap position via selsyn, current-loop analog output, digital position indicator, multi-contact position indicator, and more.

Transform Your LTC into an Intelligent Transformer

With the available VlCM, your lTC transformer will talk to you. VlCM provides alarm contacts for the 16L, 16R, Nominal and Off Tap positions and operational counter information on its PlC screen and on your PC screen via remote or direct access. Electronic contacts replace mechanical switches common in other devices for greater reliability and lower cost.

Voltage Regulators

Three-phase voltage regulators are used in distribution and transmission applications to maintain steady voltages. The voltage ratio of a regulator is nearly one to one as its basic design differs from that of an OlTC transformer, in that it is wound as an auto-transformer.

Many critical applications require a more controlled voltage delivered at the load terminals. Three-phase voltage regulators can perform this duty by employing a load tap changer, which is operated by sensing the load voltage. Our designs utilize the Reinhausen RMVII tap changer. Normally, about +/-10 percent voltage is required to be corrected and therefore employing an auto-transformer configuration would result in ten times the through-put power for the same sized transformer.

Long Life and Reliability Means You Keep the Power On

Virginia Transformer utilizes coil-winding designs and bracing to maximize short-circuit strength. The core and coil designs are also optimized to the customer’s loss evaluation profile. Hot spots are calculated to ensure the transformer runs at a consistent and appropriate temperature, with additional cutting-edge equipment available to monitor transformer health.

OLTC Transformers available from 500 kVA to 1400 MVA in liquid filled units up to 500 kV class.

Isolation view of VLCM with accessible PLC.
Direct or remote access to data with optional wired connection (wireless network).
VLCM installs neatly inside the LTC motor cabinet.

Transformer Facts

Ever Expanding Markets and Applications

Utility

Power Generation

Virginia Transformer maintains professional relationships with engineering consulting firms and keeps a large archive of engineering solutions complete with utility customer profiles to facilitate your specification and purchasing process.

Industrial Applications

Rectifier Duty
Paper & Cement Mills
Steel Mills
Motor Start
Fan, Pump, & Compressor Operation
Data Centers
Bitcoin Mining
EV Charging Stations

Commercial/Institutional

Transit & Large Drive

Extra Heavy Duty Traction (RI9)
ANSI Circuit 25, 26, 25 & 26, 31, 41
Up to 5000 kW Rectifier
Up to 20,000 HP, AC, DC
Liquid Filled - 55º C or 65º C Rise
Dry Type – 80º C, 115º C, 150º C Rise