800 KVA Low Voltage Dry Type Transformer-6.6/0.55 KV | South Africa 2025

Cast Coil Dry Type Transformer: Unmatched Safety, Zero Maintenance.

01 General

1.1 Project Description

800kVA cast coil dry type transformer was delivered to South Africa in 2025. The rated power of the transformer is 800 kVA with KNAN/KNAF cooling. The primary voltage is 6.6 kV with ±2*2.5% tapping range (NLTC), the secondary voltage is 0.55 kV, they formed a vector group of Dyn11.

In today’s world, where business continuity, safety, and energy efficiency are paramount, the low voltage dry type transformer stands as the cornerstone of a modern electrical distribution system. Engineered for maximum reliability, these transformers provide unparalleled peace of mind. Their flame-retardant, epoxy-encased design eliminates fire hazards, allowing for safe installation directly adjacent to your critical loads, which saves valuable space and reduces installation costs.

With a focus on sustainability and low total cost of ownership, our cast coil transformers feature high-efficiency designs that minimize energy losses, leading to substantial operational savings. They require virtually no maintenance and are built to withstand the toughest industrial conditions, ensuring uninterrupted power for your most vital operations-from manufacturing plants and renewable energy projects to commercial complexes and public infrastructure. Choose cast coil technology for a smarter, safer, and more sustainable power solution.

1.2 Technical Specification

800 kVA low voltage dry type transformer specification and data sheet

1.3 Drawings

800 kVA low voltage dry type transformer diagram drawing and size.

02 Manufacturing

2.1 Core

The iron core is meticulously designed to operate at low flux densities, significantly reducing no-load losses and ensuring quiet performance. To prevent eddy current paths, the thin laminations are individually coated with an insulating layer. After stacking, the core is securely bonded and solidly grounded at a single point, eliminating the risk of circulating currents and ensuring safe, reliable, and energy-efficient operation.

2.2 Winding

For low voltage dry type transformer windings, conductors are arranged in an orderly manner and insulated with glass fiber materials first, followed by vacuum pressure casting with heat-resistant epoxy resin compound. The cured winding forms a compact, solid insulation system that not only has high dielectric strength and thermal conductivity for efficient heat dissipation, but also features strong anti-pollution and anti-corrosion capabilities, suitable for various indoor and outdoor applications.

2.3 Final Assembly

For low voltage dry type transformer assembly, the iron core is first positioned firmly. Pre-cast windings are then assembled onto the core with insulation components securing their position. Lead connections between windings and external terminals are made, and cooling systems (such as axial fans) are integrated. The enclosure is then attached, and post-assembly checks-including insulation resistance and turns ratio tests-are conducted to confirm the unit’s integrity and performance.

03 Testing

Tests for the 800kVA-6.6/0.55kV cast coil dry type transformer comply with IEC 60076-1, 60076-3 and 60076-11 standards, covering routine items: winding resistance measurement (unbalance rate ≤2%), voltage ratio/phase displacement check (Dyn11, deviation ±1/10), short-circuit impedance/load loss and no-load loss/current tests, applied voltage test (HV 20kV/60s, LV 5kV/60s), induced voltage withstand test (1.1kV, 150Hz, 40s), and partial discharge test (max ≤10pC); all measured values meet requirements, with a “Pass” conclusion.

04 Packing and Shipping

4.1 Packing

For low voltage dry type transformer, wooden box packaging features reinforced corners and steel strapping on the crate exterior. Inside, custom wooden supports are used to align with the transformer’s base, foam buffers fill gaps between the body and crate, and a sealed dust-proof layer is added-suitable for securing the unit during long-distance or heavy-load shipping.

4.2 Shipping

For the low voltage dry type transformer, transportation is arranged under CIF terms to Durban port. The wooden-packaged transformer is loaded into shipping containers; the seller bears the ocean freight and procures marine cargo insurance covering basic risks. It will be safely transported to Durban port, with the seller fulfilling delivery obligations upon loading the goods on board the vessel.

05 Site And Summary

Merging advanced cast coil technology with the inherent safety of dry-type construction, our cast coil dry type transformer addresses the critical demand for stable, low-risk power distribution. Perfect for environments where oil-filled units are impractical, it excels in harsh or sensitive settings while meeting global performance benchmarks. More than a component, it’s the steady backbone of your electrical infrastructure-backed by quality to empower your long-term operations.