posted Mon, 11 November 02 00:30
We have a situation where two oil-filled transformers (Attach), rated for 13.8 KV with an oil quantity of 2100 letters, are spaced 5 meters apart with a 2-hour fire wall in between. Each transformer is provided with an oil-collection pit, designed for full oil discharge, filled with fire quenching stones. It was noted that the fire-rated separation wall is lower than the height of the oil reservoir. Furthermore, the bus duct of one transformer pass over the firewall and penetrate the substation?s wall such the spacing between it and the adjacent bus duct is approximately 1 to 2 meters (see pictures). My questions are, 1) Is the firewall required for separating transformers of this size, IEEE-979 has no details about separating small transformers from each other? If the firewall is required, does it have to be higher than the bus ducts of the adjacent transformer, i.e. 1 ft above it? If it is not practical to extend the wall and yet maintain adequate spacing around the transformers for future maintenance, would fireproofing the I-Beams of both transformers bus ducts suffice in protecting one transformer from a fire involving the adjacent one?
Thanks in advance.
JABER.M.AL-HAJI
hajijm@aramco.com.sa
Jaber Al-Haji
Fire Prevention Engineer
We have a situation where two oil-filled transformers (Attach), rated for 13.8 KV with an oil quantity of 2100 letters, are spaced 5 meters apart with a 2-hour fire wall in between. Each transformer is provided with an oil-collection pit, designed for full oil discharge, filled with fire quenching stones. It was noted that the fire-rated separation wall is lower than the height of the oil reservoir. Furthermore, the bus duct of one transformer pass over the firewall and penetrate the substation?s wall such the spacing between it and the adjacent bus duct is approximately 1 to 2 meters (see pictures). My questions are, 1) Is the firewall required for separating transformers of this size, IEEE-979 has no details about separating small transformers from each other? If the firewall is required, does it have to be higher than the bus ducts of the adjacent transformer, i.e. 1 ft above it? If it is not practical to extend the wall and yet maintain adequate spacing around the transformers for future maintenance, would fireproofing the I-Beams of both transformers bus ducts suffice in protecting one transformer from a fire involving the adjacent one?
Thanks in advance.
JABER.M.AL-HAJI
hajijm@aramco.com.sa
Jaber Al-Haji
Fire Prevention Engineer