Underground Vault Ventilation
Why Use a Blower?
Forced ventilation is required for underground transformer
vaults to remove the heat dissipated by the transformers. The heat loss
on different transformers vary slightly. Most transformers lose approximately
1½% of their capacity to heat, when operated at full rated capacity.
When transformers are overloaded, their heat loss is considerably more.
Why Blow Air into a Vault?
Forcing air into a vault benefits the transformer in two ways:
Why Vent Size is Important
The vent sizing should be large enough to allow air movement without an excessive pressure drop. If the inlet and outlet vent sizes are too small, the volume of air will decrease and cause the transformer to heat vault up. During periods when the transformers are operating at capacity, this excessive heat will cause the transformers to operate less efficiently and will shorten the life of the transformers.
Where to Locate the Inlet and Outlet
The inlet and outlet should be located on opposite side
of a transformer vault. However, with a Swing out Blower, air is forced
into the vault at high velocity and turbulent air is pushed all around
the vault. With this type of blower, the inlet and outlet can be located
on adjacent walls if necessary.
Typical Mounting Arrangements
The plenum arrangement has the advantage of making any
vault easily converted to a blower system.
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