Current design concepts in insulation coordination are such that field strength excesses are avoided by constructive measures. Examples include cable bushings, connectors, and terminations. These concepts are complex, costly, and require careful handling of components during assembly.
NLCM materials are based on innovative insulation compounds that are able to reduce the specific electrical resistance with increasing field strength (see figure). Inhomogeneities, which normally lead to field strength increases, cause a local increase in the conductivity of the NLCM material. This reduces the local maximum field strength in the material and prevents the occurrence of partial discharges.
The expected benefits are reduced complexity of the insulation system due to the elimination of processing steps and a smaller number of components, as well as higher reliability due to a failure-redundant material behavior.
We draw on extensive knowledge and experience of the electrical properties of nonlinear insulating materials. The special feature of NLCM is that some material properties sometimes show strong dependencies on e.g. environmental parameters and factors such as the filling level. More detailed information on the material investigations, the properties that can be determined and their dependencies can be found in the section Material Studies.
The area of application of NLCM should not remain unmentioned at this point. Here, all the above-mentioned influencing factors come together and offer new challenges due to their interaction. Depending on the application scenario, the material properties must be specially adapted. In order to be able to guarantee this, we offer you, in addition to our many years of experience in dealing with NLCM, expertise in the field of Electric Field Simulation, and Rapid Prototyping.
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For more information on Nonlinear Conductive Materials, please also see Publications.