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GENERAL |
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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. |
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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. |
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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. |
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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. |
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With the capability of sustaining energies ranging from Joules to
Mega-Joules, at frequencies up to Mega-Hz, HVR resistors can be used in
the most demanding applications. |
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HVR
International continues to expand its markets wherever there is a demand
for resistors with high voltage and high energy per unit volume. In this
respect, the Ceramic Carbon Resistor is probably superior to any other. |
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PRODUCT
TESTING |
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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. |
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QUALITY POLICY |
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With respect to the current range of products, HVR's Manufacturing Systems
are ISO 9001-2000 approved by the Ceramic Industry Certification Scheme
Ltd. |
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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 Engineers, before product
release is granted. |
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