Inno­va­tive insu­la­tion tapes

The effi­ci­ency and ser­vice life of an electri­cal machine depends to a large extent on the insu­la­tion sys­tem. In order to extract maxi­mum per­for­mance from this sys­tem, we rigo­rously pur­sue a sys­tem approach.

Our com­pre­hen­sive port­fo­lio of insu­la­ting tapes ran­ges from mica-based con­duc­tor insu­la­tion to main insu­la­tion and corona pro­tec­tion with con­duc­tive and semi-con­duc­tive tapes.

In com­bi­na­tion with spe­ci­fi­cally deve­lo­ped resin sys­tems, this results in highly resistant and dura­ble insu­la­tion sys­tems. These are ide­ally sui­ted to with­stand all electri­cal, mecha­ni­cal, ther­mal, and envi­ron­men­tal stres­ses occur­ring over the ent­ire ser­vice life, thus gua­ran­te­eing safe, fault-free ope­ra­tion.

To gua­ran­tee the excel­lent qua­lity of our pro­ducts, we mas­ter the com­plete value chain from mica mining and resin deve­lo­p­ment on the raw mate­rial side to ready-to-install win­ding com­pon­ents from our coil shop in India.

Our com­pre­hen­sive exper­tise for mate­rial, insu­la­tion sys­tem and coil enab­les us to con­ti­nuously opti­mize and deve­lop our sys­tem offering.

Pro­ducts & solutions

Electri­cal insulation

The task of the main wall insu­la­tion is to sepa­rate the coil or bar win­ding of the electri­cal machine, which con­sists of indi­vi­dual live con­duc­tors. For this pur­pose, the mica tapes are wound onto the coils or bars in several lay­ers, eit­her manu­ally or by machine.

We are the pioneers of modern mica tapes for both the Resin Rich (RR) and Vacuum Pres­sure Imp­reg­na­tion (VPI) pro­ces­ses. Both pro­ces­ses pro­duce high qua­lity, cost effec­tive main wall insu­la­tion with extreme resis­tance to electri­cal discharge, due to our pro­prie­tary mica paper com­bi­ned with mecha­ni­cally robust car­rier mate­ri­als and various resin systems.

While Resin Rich Sys­tems com­bine the advan­tage of low costs with a high fle­xi­bi­lity in the ser­vice busi­ness for small and medium sized electri­cal machi­nes, VPI insu­la­tion sys­tems show their advan­ta­ges espe­cially in high volume applications.

With both tech­no­lo­gies, the main wall insu­la­tion pro­du­ced with our sys­tems is cha­rac­te­ri­zed by the fol­lowing properties:

  • high dielectric strength
  • high par­tial discharge resistance
  • wrinkle-free ban­ding
  • sui­ta­ble for manual and machine processing
  • full com­pa­ti­bi­lity with pre­de­fi­ned resin systems
  • app­li­ca­ble for con­ven­tio­nal and flat coil technologies

With Sami­ca­por®, Von Roll has deve­lo­ped a range of out­stan­ding vacuum pres­sure imp­reg­na­ting mica tapes (VPI) that are fully com­pa­ti­ble with spe­cially deve­lo­ped or pre­de­fi­ned resin systems.

Under the brand name Sami­ca­therm® we offer a com­pre­hen­sive range of Resin Rich (RR) tapes and sys­tems as the main wall insu­la­tion for both con­ven­tio­nal and hydro­sta­tic pres­sing processes.

Espe­cially for the insu­la­tion of end-win­dings, we have deve­lo­ped mica tapes under the names Filosam® and Sami­caflex®, which ensure a cer­tain mecha­ni­cal fle­xi­bi­lity during instal­la­tion and operation.

Tar­ge­ted con­trol and dis­tri­bu­tion of electri­cal stres­ses wit­hin the electri­cal machine are an essen­tial design com­po­nent of any high vol­tage machine to pre­vent damage during high vol­tage tes­ting and ope­ra­tion, and to ensure the ser­vice life of the ent­ire insu­la­tion system.

Von Roll has deve­lo­ped con­duc­tive and semi­con­duc­tive tapes with dif­fe­rent con­trol cha­rac­te­ris­tics. Coro­na­Shield® C ser­ves as outer corona pro­tec­tion with con­stant resis­tance to pre­vent dischar­ges inside the sta­tor slot; Coro­na­Shield® SC as end win­ding corona pro­tec­tion with vol­tage-depen­dent resis­tance for tar­ge­ted field con­trol at the slot exit.

The task of con­duc­tor insu­la­tion is to sepa­rate the indi­vi­dual live con­duc­tors from each other. For this, our mica tapes are wound onto the con­duc­tor by machine.

Depen­ding on the app­li­ca­tion, our Sami­ca­film® pro­ducts con­sist of various com­bi­na­ti­ons of mica papers, car­rier films, and bon­d­ing resins matched to the app­li­ca­tion. The car­rier films are optio­nally coated with a hot melt adhe­sive. The use of our Sami­ca­film® tapes as pre­fer­red con­duc­tor insu­la­tion for sta­tor and rotor coils offers the fol­lowing advantages:

  • very high par­tial discharge resis­tance, espe­cially under impulse stres­ses and in con­ver­ter operation
  • lower insu­la­tion thickness
  • hig­her fle­xi­bi­lity and shor­ter deli­very times

The out­stan­ding ther­mal pro­per­ties of the non-com­bus­ti­ble mine­ral mica enable the use of mica tapes for fire-resistant cables in safety-rele­vant buil­ding instal­la­ti­ons that save lives in the event of fire.

Our Cab­losam® mica tapes enjoy an excel­lent repu­ta­tion world­wide. They are spe­ci­fi­cally desi­gned for our cus­to­mers’ taping tech­no­lo­gies and are the pre­fer­red choice for mee­ting strin­gent inter­na­tio­nal stan­dards. Cab­losam® tapes are also free of halo­gens and do not release toxic fumes.