TMAC Portable Earth Systems

clamps

phase-clamps

phase-clamps2

phase-clamps3

Unitest can supply portable earth systems to your requirements for sub station or overhead with copper or alum cables and ratings to 45kA with standard ratings 10/16/25kA per 0.5sec. Distance between phases & downlead length to your needs.

Specifications

Documentation	customer-selection-chart.pdf
Benefits and Features	Portable Earthing and short-circuiting equipment is temporarily installed on isolated power circuits to provide a control path for short-circuit current and to prevent voltage rise in the earth circuit Earthing and short-circuiting devices for fault currents to 31.5 kA - 0.5s Copper cable 25 mm2 to 95 mm2 Aluminium cable 50 mm2, 95 mm2 and 150 mm2 Wide variety of clamps suitable for a wide range of connection points and common types of applicator tools
Applications	The required cable cross-section depends on the rms short-circuit current (IR), the duration of the fault and the type of installation. The graphs below help to determine the required cable size for a given fault current (IR) and fault duration (sec). For outdoor use the highest possible temperature rise is adopted to keep the weight to a minimum.

HV Diagnostics

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