HVR High Voltage, Non Inductive, Ceramic Carbon Linear Resistors are manufactured (to ISO 9001-2000 Standards) from a carefully blended mixture of clays, alumina and carbon.

After mixing and granulating, the material is pressed to the required shape, with diameters ranging from 3 to 152mm.

The resistors are then fired, at very high temperatures, in a tunnel kiln with a controlled reducing atmosphere. This produces a Bulk Ceramic Carbon Resistor which is 100% Active Material, and therefore of Minimum Size.

Typically aluminium is then flame sprayed onto the flat surfaces of the Ceramic Resistor to provide reliable electrical contact and an anti-track coating is applied to the edges to improve dielectric withstand.

The Ceramic Carbon Resistor Technology enables the manufacture of a Wide Variety of Geometries in a Wide Resistivity Range, with constant mechanical strength. They are Robust, good in compression and capable of absorbing transmitted mechanical shock, provided direct impact is avoided.

Product Testing

Testing and Product Development is undertaken in either of the Materials, Applications or High Voltage Laboratories. The latter is equipped with a 2 Stage Marx Generator capable of delivering 100 kV.

Quality Policy

Throughout the process, detailed mandatory quality control procedures are adhered to, culminating in the 100% High Voltage Performance Testing of all Heavy Duty Switchgear Resistor Discs.

Further Laboratory High Voltage Performance Testing & Analysis is undertaken by Applications Technicians and verified by Applications Engineers, before product release is granted.