GNEE Electric Successfully Ships 3 Units Of S13-M 11KV 2500KVA Oil-Immersed Transformers To Russian Power Grid Project

GNEE Electric, a seasoned power transformer manufacturer with over 15 years of manufacturing excellence and thousands of successful installations worldwide, proudly announces the on-time dispatch of three high-capacity S13-M 11KV 2500KVA oil-immersed transformers destined for a strategic Russian power grid project.

 

 

This shipment, fully engineered and tested in our ISO 9001-certified production base in China, reinforces our position as a go-to global supplier for mission-critical oil-type distribution transformers. The trio of transformers has passed all customer-witnessed routine tests and is now en route to bolster grid reliability in demanding climatic conditions.

 

 

When a major Russian grid engineering contractor sought to upgrade an aging substation in a region known for extreme winter temperatures and high load fluctuations, they required a transformer solution that combined high efficiency, rugged construction, and strict adherence to IEC standards. After a thorough technical evaluation of multiple international suppliers, the project team selected GNEE's S13-M 11KV 2500KVA oil-immersed transformer for its superior no-load loss performance, robust 11KV primary design, and proven track record in cold-climate installations. The order encompassed three identical units, each engineered to deliver 2500KVA of continuous apparent power while maintaining stable voltage transformation under challenging grid conditions.

 

 

Our engineering team collaborated directly with the end user's technical department throughout the design freeze phase, fine-tuning the vector group (Dyn11), tapping range, and accessories such as the off-circuit tap changer, oil conservator with magnetic oil level gauge, and moisture-resistant breathing system. This customer-centric approach ensured that every S13-M 11KV 2500KVA oil-immersed transformer unit perfectly matched the Russian grid's protection and operating philosophy.

 

 

The S13-M series represents the latest evolution in oil-immersed distribution transformer technology, designed to deliver outstanding energy performance over a 30-year service life. For the Russian grid project, the S13-M 11KV 2500KVA oil-immersed transformer configuration provides several decisive advantages:

 

• Ultra-Low Losses: The S13 core, built with high-permeability, grain-oriented silicon steel, reduces no-load loss by approximately 30% compared to the older S11 series, directly lowering operational carbon footprint and energy costs.
• Optimized 11KV Primary Design: Rated at 11KV on the high-voltage side with a full-capacity 2500KVA rating, this transformer easily integrates into medium-voltage distribution networks typical in Russia and CIS countries.
• Enhanced Thermal Management: The mineral oil immersion combined with corrugated fin-wall tank design maximizes heat dissipation, enabling continuous full-load operation without hot-spot derating even in sealed substation enclosures.
• Cold-Climate Resilience: Special attention was given to gasket materials, oil viscosity characteristics, and conservator design to guarantee reliable operation at ambient temperatures as low as -45°C.
• Comprehensive Protection Suite: Each transformer features a pressure relief device, Buchholz relay connection, dial-type thermometer, and drain/sampling valve, forming a complete safety and monitoring ecosystem.

 

These features make the S13-M 11KV 2500KVA oil-immersed transformer a future-proof asset for any utility, heavy industry, or renewable integration point requiring medium-voltage step-down transformation.

 

 

Quality is not an option but a non-negotiable foundation at GNEE Electric. Every S13-M 11KV 2500KVA oil-immersed transformer leaving our factory undergoes exhaustive routine and type testing programs, strictly following IEC 60076 standards and customer-specific acceptance criteria. The three Russian-bound transformers were subjected to the complete test protocol:

• Winding Resistance Measurement to verify precise conductor specifications and connection integrity.
• Voltage Ratio & Vector Group Check confirming accurate Dyn11 configuration and tap changer positions.
• Insulation Resistance & Dielectric Withstand Tests on both HV and LV windings, ensuring robust inter-turn and phase-to-ground insulation.
• No-Load and Load Loss Measurement, with results validated against S13 energy-efficiency limits - real-time data showed no-load losses well below the guaranteed threshold.
• Oil Breakdown Voltage & Moisture Content Analysis of the insulating mineral oil, verifying compliance with Class I oil specifications according to IEC 60296.
• Temperature Rise Test Simulation carried out on an identical reference unit, proving that winding hot-spot temperatures stay within safe margins at 2500KVA rated load.
• Leakage & Pressure Tightness Test for the fully welded tank and conservator assembly.

 

A detailed factory acceptance test report was compiled and approved by the client's inspector before dispatch, reaffirming that each S13-M 11KV 2500KVA oil-immersed transformer is ready for immediate energization upon arrival. This meticulous quality commitment is what earns GNEE repeat orders from EPC contractors, utilities, and industrial end-users across 60+ countries.

 

 

Parameter	Specification
Model	S13-M-2500/11
Standard	IEC 60076
Rated Apparent Power	2500 KVA
High Voltage (HV)	11 KV
Low Voltage (LV)	0.4 KV (customizable)
Frequency	50 Hz
Vector Group	Dyn11
Cooling Method	ONAN (Oil Natural Air Natural)
Insulating Oil	IEC 60296 Class I Mineral Oil
No-Load Loss	≤ 2.3 kW (S13 energy class)
Load Loss (75°C)	≤ 17.5 kW
Impedance Voltage	6.0% ± 10%
Tapping Range	±2×2.5% (Off-Circuit Tap Changer)
Winding Material	HV: Copper / LV: Copper
Temperature Rise (Oil/Wind.)	55K / 65K max
Ambient Temperature Range	-45°C to +40°C
Accessories	Oil conservator, magnetic oil level gauge, drain valve, thermometer pocket, pressure relief device, Buchholz relay, moisture breather
Tank Type	Corrugated fin-wall, welded steel
Painting / Finish	Anticorrosive primer + grey topcoat (customer-specified)
Overall Weight	Approx. 6,800 kg per unit

 

 

Shipping a heavy, oil-filled transformer is a logistics orchestration that GNEE has refined through hundreds of overseas deliveries. The three S13-M 11KV 2500KVA oil-immersed transformers were prepared with end-to-end protection in mind:

 

• Structural Bracing: Each transformer was securely bolted to a fumigated wooden pallet base with vibration-dampening pads, and mounted shock-absorption brackets prevented movement of bushings and radiators during transit.
• Moisture Protection: All openings were sealed with weatherproof covers, while desiccant bags were placed in the control cabinets and the conservator breather port to maintain internal dryness.
• Packing Envelope: Transformers were fully enclosed in heavy-gauge polyethylene wrapping with additional anti-corrosion VCI film, followed by reinforced steel strapping suitable for containerized or breakbulk shipping.
• Container Loading & Securing: The units were lifted using certified lifting lugs and positioned inside 40' open-top containers. Timber bracing and tie-down systems were then applied according to international maritime dangerous goods guidelines (oil-filled equipment compliant with IMDG Code).

 

All shipping documents, including the Certificate of Origin, commercial invoice, packing list, bill of lading, and test reports, were hand-delivered electronically to the client prior to the vessel's departure. Our logistics team provided real-time container tracking visibility, ensuring the Russian project owner could anticipate and plan for the on-site receiving and storage of the 2500KVA units.

 

 

The seamless shipment of three S13-M 11KV 2500KVA oil-immersed transformers to Russia's power grid sector demonstrates GNEE Electric's precision engineering, strict quality culture, and commitment to customer timelines. Whether you need a single replacement unit or a complete batch of S13-M 11KV 2500KVA oil-immersed transformers for an upcoming substation, rural electrification, or industrial facility, GNEE is ready to supply factory-direct with full documentation and competitive pricing.

 

Take Advantage Of Our Technical Expertise Now.

 

Send us your specifications, and our engineers will return a tailored quotation within 24 hours. Let's discuss how a high-efficiency oil-immersed transformer from GNEE can make your power network more resilient and energy-efficient. Click the inquiry button or email our dedicated team today - your project deserves world-class transformer performance.