Cast Resin Dry-Type Transformers

Environmentally friendly transformers
Output range from 50 kVA up to

25 MVA


Operating voltages up to 36 kV

Customized solutions for
individual requirements

✓ Exceeds highest safety standards
✓ Maintenance-free & eco-friendly
✓ Electrically safe
✓ No gas inclusions
✓ Sustainable

C1

C2

 
Climate
category

E2

E3

 
Environmental
class

F1

 
 
Fire resistance
class

Product Catalogue

Exceeding highest safety standards

Transformers are designed and manufactured as standard in accordance with IEC 60076-11.

The low ignition hazard and self-extinguishing character, to verify fire protection class F1, is proved by testing that complies with the European body of regulations and standards (IEC).

+ Routine and type testing are done according to international standards.

+ Routine and type testing are done in the manufacturer’s own modern test area.

+ First transformer manufacturer with internal C2/C3 test area to verify climate class.

+ First transformer manufacturer with internal E2/E3 test area to verify environmental class.

+ Verification of internal tests by German agency TÜV-Süd / other renowned institutes.

+ Operation of cast resin transformers possible in temperatures down to -50°C.

Maintenance-free & eco-friendly

The cast resin dry-type transformers are insulated with an epoxy resin & quartz powder mixture – an environmentally friendly material that allows the winding to be:

+ Almost maintenance-free.

+ Flame-retardant.

+ Self-extinguishing.

+ Moisture-resistant.

+ Tropicalized.

No toxic gases are produced, not even under the effects of arcing. The unique developed spacers of the coil support system ensure isolation of vibrations from the iron core, which result in lower noise levels.

Recyclable

Even at the end of their life-cycle, cast resin dry-type transformers have ongoing benefits:
+ Without any danger to the environment, up to 90% of the material can be recycled.

Electrically safe

The transformers feature vacuum-encapsulated high voltage coils, of which the winding is designed as a double-layered winding.

Why double-layered winding?

+ There are two established processes to connect the end lead bars to the coils: (1) Inert gas welding, OR (2) Cold pressure welding under high pressure (400 kN). By using only cold pressure welding, there is no metallurgical change to the conductor metal by means of a thermal process, and no foreign matter occurrence.

+ By using multi-layer prepregs with subsequent bonding, a highly resistant cylinder is created. Unlike other conventional solutions, this cylinder is capable of absorbing the radial short-circuit forces in a self-supporting fashion. The simple support to the core is used only for centering.

+ The winding edges are stiffened additionally. This affords reliable protection against the penetration of humidity, and enhances mechanical resistance. This technology has proven its worth over many decades, including in terms of extreme applications, and is equil to encapsulated winding.

No gas inclusions

The high voltage windings are potted with epoxy resin under vacuum at a high temperature, to ensure the following:

+ Undesirable gas inclusion prevention.
+ Freedom from partial discharges (up to twice the rated voltage) provision.

The low-voltage strip winding is also made of copper or aluminum. The width of the strip is equal to the length of the coil, to ensure that:

+ Axial short-circuit forces in the transformer are reduced.

Enquiry Form

Output range from 50 kVA up to

25 MVA


Operating voltages up to 36 kV

Customized solutions for
individual requirements

✓ Highest safety standards
✓ Maintenance-free & eco-friendly
✓ Electrically safe
✓ No gas inclusions
✓ Sustainable

C1/C2 Climate class
E2/E3 Environmental class
F1 Fire resistance class

Let one of our engineers contact you.

9 + 11 =

©2017 Red Metal Mining Zambia Ltd.

©2017 Red Metal Mining Zambia Ltd.