Transformer Location
Transformer Location
(OP)
Our project is inovoved with lot of ONAN type transformers (11kv/400V). All of our transformers are going to be placed in a row with fire barrier/brick wall, with concrete covered roof, with front side two double gates with mess fences.
The issue is whether these transformers can be indoor mounted with complete covered roof (and with proper oil catchment area).
Can the transformer roof be with Structural roof for ONAN type?
Does any standard say about ONAN transformer roof details? whether it is required or not required as a sfatey point of view? what does NFPA say?
Any info.. greatly appreiciated.
Thanks..
The issue is whether these transformers can be indoor mounted with complete covered roof (and with proper oil catchment area).
Can the transformer roof be with Structural roof for ONAN type?
Does any standard say about ONAN transformer roof details? whether it is required or not required as a sfatey point of view? what does NFPA say?
Any info.. greatly appreiciated.
Thanks..






RE: Transformer Location
Regards
Marmite
RE: Transformer Location
our transformers are 3MVA and 1.6MVA range and all are ONAN type.
The trnaformer room height is around 4meters, with structural roof.
RE: Transformer Location
ALL transformers, regardless of size, produce heat, with the amount of waste heat increasing with the load it is carrying.
You must ensure enough ventilation to remove this heat, or risk damaging your transformer.
A thermostatically controlled forced-air vent system MAY be enough, if you are not in a hot climate where this may prove inadequate.
(A 99% efficient 3MVA xmfr is going to produce ~30kW of heat at full load. This is about the same as 20 baseboard heaters in your home!)
RE: Transformer Location
1. heat dissipation of each type of trafo.
2. how many trafos are likely to be operating at the same time.
3. what is the required internal temperature.
He will use the ASHRAE tables to find the average maximum temparature in the zone of installation and calculate how much air circulation is needed (cfm or m^3/hr).
Since it is hardly likely that any AC will be provided, the mechanical engineer might request more louvered openings in the walls.
You should also communicate the data to the structural engineer, as excessive heat might evaporate the water from the concrete used in the construction of the separations walls, and hence an appropriate concrete mix must be used, etc.
RE: Transformer Location
unfortunately, i dont have a mechanical engineer to calculate this requirement.
However, each of my tranformer is enclosed in 6mx5.2m area with height of 4m meters and it is enclosed 3 sides only ane side is with full opening / double gates.
Do we require a forced ventilation (FOR 3MVA, 0NAN, 11/3.3KV). or any natural venitaltion window are sufficient?
Thanks tinfoil for your info,
RE: Transformer Location
Thanks