Transformer maintenance and mineral insulating oil treatment. Equipment developed from years of field operation, through Niroo Sadraye Bargh Fars.
12,000 litres / hour
Approximately 15 years
Up to 500 MVA · assessed per project
Newly built · ready for deployment
Both versions are ready for operation. V1 provides the field history; V2 incorporates that experience and has completed internal quality-control testing.
Long-running field equipment with regular upgrades and systematic periodic maintenance.
Established field system
A new build informed by V1 experience. Ready for deployment or sale; field service history is still to come.
Internally tested · ready for deployment
A three-page overview of VEX v1 and VEX v2, their shared nominal specifications, selected V1 laboratory results and project contact details.
Preliminary technical information. Final configuration and acceptance criteria are agreed for each order.
English PDF · 3 pages · 1.3 MB · Rev 0.2
Multi-stage particle filtration, with a washable metal-mesh filter and a 7-micron paper filter. 5- and 3-micron options can be specified.
Independently controlled heaters distribute heat transfer along the pipe path. A critical-temperature condition shuts down all heaters.
Oil is sprayed through multiple nozzles in the vacuum chamber for dehydration and degassing.
Oil returns to the transformer. Treatment is repeated according to oil condition and the required quality; bypass flow adjusts internal recirculation.
Process overview. Pass count and treatment time depend on oil condition, project requirements and laboratory results.
| Nominal single-pass oil flow | 12,000 L/h · bypass closed |
|---|---|
| Vacuum pump | ULVAC PKS-030 |
| Pump design pumping speed | 180 m³/h · manufacturer specification |
| Oil-pump motors | 2 × 5.5 kW rated mechanical output |
| Oil-pump connections | 2 inches |
| Installed heaters | 12 × 11 kW · independently controlled |
| Electrical supply | Three phases + neutral · 380 V line-to-line |
| Operating temperature | Up to 70°C · controlled heating |
| Footprint / height | 220 × 160 cm / 220 cm |
| Approximate weight | 3 tonnes |
Heater ratings describe installed capacity, not simultaneous electrical demand. Operation with fewer heaters can accommodate limited power availability, with longer treatment time. Electrical requirements are confirmed for each configuration. Pump catalogue pumping speed is distinct from chamber operating pressure.
A short excerpt from an actual project. Ambient audio removed.
Operating footage recorded in Abadan. The gauge indicates relative vacuum; this recording does not establish a calibrated absolute chamber pressure.
Oil-treatment equipment configured for operating conditions, with optional HMI and IoT/IIoT integration.
Filtration, dehydration and degassing, with post-treatment laboratory assessment. Online operation is assessed per transformer.
Transformer and substation inspection and maintenance, with project-specific overhaul requirements.
Application-specific operator training and agreed support for equipment delivery and field projects.
Our field work also covers transformer inspection, maintenance and overhaul, alongside power-network and substation maintenance. Equipment inspection, project quality oversight, safety review and final testing form part of my responsibility. The work is defined around each transformer’s condition and the site’s requirements.
Original photographs of our maintenance projects. This gallery shows broader transformer and substation work, separate from the VEX equipment galleries.
Discuss a maintenance project ↗
Niroo Sadraye Bargh Fars is our family business, founded by my father. I have worked closely across its equipment design, manufacturing and field operation throughout the years. My brother, a power electrical engineer, also works in the business.
I led the complete design and supervised construction of both VEX generations, with technical contributions from my father, my brother and other specialists, informed by scientific and engineering references. My work includes pre-production simulation, software, production coordination, periodic inspection and performance monitoring. I am the technical director and a current board member, with decision-making responsibility for this business. Across field projects, I oversee quality, equipment safety review and final testing after the work.
Eight V1 post-treatment samples in the supplied laboratory reports record water content of 8–13 mg/kg and breakdown voltage of 60–67 kV. Both properties were assessed as “Good” in each report.
Selected samples, not a universal guarantee. No paired pre-treatment results are included. Gas analysis is a separate assessment: one sample is IEEE Status 2 with six-month follow-up recommended. These reports do not certify V2 field performance or directly measure cellulose moisture.
Yes. Custom configurations can include HMI, IoT/IIoT and application-specific operator training. Send your location, required oil-treatment capacity, available power and operating requirements so the configuration and delivery scope can be assessed.
Online treatment has been carried out with VEX v1. Suitability is assessed for each transformer and site; it is not assumed for every installation. Transformer-tank evacuation is a separate consideration from vacuum treatment inside the equipment.
The supplied post-treatment field reports relate to VEX v1. VEX v2 is newly built and internally quality-control tested, ready for deployment or sale. Final acceptance conditions and any project-specific testing are agreed with the customer.
Start with the project location, equipment or service requirement, transformer rating and voltage, a short description of oil condition, and any recent test reports. If some details are unavailable, a short written brief is enough to start the discussion.
Equipment builds, oil treatment and broader transformer or substation maintenance are scoped separately. Online treatment, tank evacuation and insulation drying require assessment of the specific transformer and operating conditions. HMI, IoT/IIoT options and application-specific training can be included in custom projects.
Send the location, transformer rating, oil condition and whether you need equipment or field service. International delivery and service depend on project economics and destination requirements.