Download PUB-NP-006 Q. Tab 2.2: 2016 Additions Due to Load Growth Page 2

Requests for Information
PUB-NP-006
NP 2016 CBA
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Q.
Tab 2.2: 2016 Additions Due to Load Growth
Page 2
Considering the decision to install a new 50 MVA substation transformer to replace
an existing 20 MVA substation transformer at GFS Substation, what is the
maximum load that can be backed up using Newfoundland Power’s mobile devices?
A.
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The maximum load that can be backed up using Newfoundland Power’s mobile
substations is 50 MVA. Newfoundland Power has two mobile substations, units P4 and
P5, that are both capable of backing up a 50 MVA substation transformer at the
138 kV/25 kV voltage rating that exists at GFS Substation.1
Cold load pickup must be taken into account when using a portable substation to replace a regular substation
transformer. Portable substations have less capacity for overloads due to their compact design and forced
cooling systems.
Newfoundland Power