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MEDIUM VOLTAGE GUROFLEX
Description
GUROFLEX MV is a two-component cold-pour insulating compound. After mixing and pouring it cures to a soft rubbery solid that will not melt or flow. It has excellent electrical characteristics and is suitable for a wide range of bulk insulation applications in medium voltage electrical power equipment.
Because GUROFLEX MV is a cold pour material there are none of the serious hazards associated with the heating and pouring of conventional bitumen or oil-based insulating compounds. One of the outstanding advantages of its chemical make-up is that GUROFLEX MV is non-hazardous and does not contribute to environmental
problems. The liquid components and mixed compound are not subject to any safety classification and no special measures are required for transportation, handling or disposal of waste.
The principal application for GUROFLEX MV is as a filling compound for cable termination boxes and bus bar enclosures associated with transformers, switchgear and
motors. It is the ideal solution for non-air-clearance cable boxes where the phase metalwork cannot be satisfactorily insulated with heat-shrink GUROFLEX MV Cold-Pour Insulating compound for Medium Voltage Applications components, tapes or other applied insulation. GUROFLEX MV will also solve problems with air clearance
enclosures caused by hostile environmental conditions (persistent humidity, chemical pollution etc.).
GUROFLEX MV has been thoroughly tested to the requirements of CENELEC cable accessory performance standard HD 629.1 (including the requirements of IEC 60502-4) for rated voltages up to 12 kV. Additional testing has included impulse voltage withstand at 125 kV. Performance qualification for applications at rated voltage 36 kV is in progress. GUROFLEX MV is compatible with all commonly-used terminations for MV polymeric and paper cables. It is also unaffected by the presence of oil based residues of traditional hot-pour filling compounds. The curing reaction is not affected by the presence of water and the cured compound has very low moisture absorption.
GUROFLEX MV is supplied as a kit comprising secure cans, a mixing spatula and a mixing/pouring instruction. Recommended shelf-life of the components is 2 years. Mixing takes about 3 minutes and can be aided by the use of a power driven stirrer. No heat is involved, and the curing compound does not generate heat. No 'topping-up' is needed and the equipment can be energised immediately after filling. Once the compound has cured to a cross-linked solid there is no possibility of leakage from gaskets or cable glands.
The curing reaction of GUROFLEX MV is relatively insensitive to temperature, making it feasible to mix and pour the compound in very cold or hot ambient conditions. The compound will cease to flow about one hour after mixing. The cured compound can be cut out of the enclosure if connections have to be changed at a later date. No heat is required.