Perfect insulation for perfect operation

In production, we have specialized in high-quality, custom-fit solutions for liquid-cooled transformers.

Benefits from customer prospective:

• Reduced effort by ordering materials / logistics / warehousing
• Optimization of the winding manufacturing process
• Increasing manufacturing capacity

Further Specialiced Parts

For further winding design and/or other insulation purposes- especially for “high-temperature transformers” of the thermal class 130 °C and 180 °C - we produce customized all kind of forming parts out of Nomex®-materials and Nomex® pressboard hybrid materials.

• Cylinder
  Application: support cylinder for winding assembly
• Spacers, intermediate layers (spacer)
  Application: Used for cooling channels and for establishing the dielectric distances
• Clackband
  Application: is part of disc windings for the production of cooling channels
• Crepe paper tubes
  Application: For insulation of conductors of winding
• Edge protection /
  Application: Electrical and mechanical protection of the edge areas of disc and layer windings
• Chimney / angle ring/
  Application: end of windings at top and down side for insulation of windings against each other and yoke.

Nomex®/GFK Main Insulation Spacer Mats

For a cost-optimized winding design as per different requirements for liquid-cooled transformers, we have the following product solutions for spacer-mats in our product portfolio:

Spacer-mats of thermal class 105 °C according to IEC / EN 60076

Spacer-mats of thermal class 130 °C (semi-hybrid insulation) according to IEC / EN 60076-14

Pacer-mats of the thermal class > 180 °C  (full - hybrid insulation) according to IEC / EN 60076-14

Nomex® Pillar Bandage

Further variations possible

Nomex® Wedges

Nomex® Pill Carpet

Pill carpet for effective cooling of the magnetic cores in power transformers

Traditionally, rigid laminate sticks are still used to provide cooling channels between the transformer sheets of the magnetic core. This cooling channel construction still has the disadvantage that due to external stress such as shocks during transport, through fault currents or similar, the laminate strip move out of position and cause collapsing of the cooling channel.

The following failed sources / errors are obvious:

• Damaged cooling medium caused overheating in the transformer core
• Damaged cooling channels increased core vibrations, which reduce the short-circuit resistance

With the pill carpet we are following a different, more innovative approach, which helps to protect our transformers against these influences.

The structure of the pill carpet is as follows:

• The Nomex® paper 356, thikness 0,13 mm, is used as the basic material
• On the base material = Nomex® paper 356 half cut
• ceramic pills are glued
• Afterwards the final produced pill carpet will be cut in accordance with your requirements of core sheet dimensions and delivered to you.

In comparison of the traditional cooling systems with rigid laminate sticks –

our pill carpets instead offer you the following advantages for your transformers:

• Cooling ducts can no longer move in wrong directions. Cooling function remains conserved over the complete life time of your transformer
• Reduced vibrations and noise emissions
• Improved cooling properties through multidirectional oil flows
• Reduced manufacturing costs / time
• Increased short-circuit strength