Means for protecting underground electrical equipment from therm

Details Means for protecting underground electrical equipment from therm Means for protecting underground electrical equipment from therm

1976-08-27

1978-06-27

Grimley, Arthur T.

Electricity: conductors and insulators

With fluids or vacuum

With cooling or fluid feeding, circulating or distributing

174 15C, 174 37, H01B 734

Patent

active

040976823

ABSTRACT:
Underground electrical equipment such as a transformer or cable is prevented from thermal runaway by back-filling the trench in which it is laid with a soil which includes water entrapped in highly water-absorbent hydrophilic polymeric gel particles soaked with water. The water-soaked particles preferably are coated with a water-impermeable film. The water may also be entrapped in liquid form in small balloon-like containers. Also, a water impermeable sheath may be formed around the back-fill soil to minimize evaporation from the particles.

REFERENCES:
patent: 2066323 (1937-01-01), Bennett
patent: 3082111 (1963-03-01), Maddison et al.
patent: 3582533 (1971-06-01), Albright
patent: 3869562 (1975-03-01), Eidinger et al.
patent: 3890613 (1975-06-01), Dunsworth et al.

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