DEPOSIT® reinforced subterranean offset pit for oil-filled power transformers

Submerged transformers up to 40MVA require according to IEC 61936-1 (§ 8.6.2.) and NF C13-200, a watertight retention representing 100% of the volume of oil contained and under certain conditions of a natural extinguishing device type ERT®, EXTICOV™ or LHD®.

Beyond 40 MVA, the transformer must be equipped with a pit or recovery tank with a minimum capacity of 20% of the quantity of dielectric contained in the transformer (1), usually equipped with an extinguishing cover of the EXTICOV™ or LHD® type(2) in order to guarantee a rapid and natural extinction of the liquid dielectric if the oils were to remain trapped there.

This recovery tank must be connected to a separate recovery tank (remote pit), with a capacity at least equal to that of the highest capacity transformer, when it is common to several transformers (3).

Moreover, when the equipment is placed outside, rainwater or fire-fighting deluge systems fill this secondary retention tank. To evacuate this water and thus avoid any risk of overflow, the tank must be equipped with a system capable of filtering and continuously evacuating the drainage water while retaining the hydrocarbons inside the secondary containment. The water discharged must not be contaminated with more than 5 ppm of hydrocarbons according to the EN 858-1 standard ("light liquid separation installations").

The DEPOSIT® range of pits meet this need for rapid construction and passive treatment of drainage water.

Vue 3D d'une fosse déportée Tri volume DEPOSIT TV HTB1 type RETIPS et RTE

DEPOSIT-MV 30 m3 fosse déportée monobloc monovolume

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DEPOSIT® subterranean containment pit for transformer

DEPOSIT® prefabricated subterranean containment pits allows you to install your interceptor faster, cheaper and more reliably in substations and for power transformers. Robust, reliable, resistant to corrosion and hot oils. Twice safer than concrete pits...
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