3.9.6 Transformers | COMNET

Transformer Type
Applicability	Buildings with large electric service
Definition	Transformers can be classified as either dry type or liquid filled (usually oil).
Units	List (see above)
Input Restrictions	Transformers can be modeled or not at the discretion of the energy modeler. If they are more efficient than the requirements in Standard 90.1-2016, then they must be modeled in order to take credit.
Baseline Rules	If transformers are modeled in the proposed design, then they must also be modeled in the baseline building.

Transformer Efficiency
Applicability	When transformers are modeled.
Definition	The efficiency expressed as a percent representing the
Units	Percent (%)
Input Restrictions	For new construction, transformers must meet the efficiency requirements in table 8.4.4 of Standard 90.1-2016.
Baseline Rules	Efficiency shall be taken from table 8.4.4. of Standard 90.1‑2016.

90.1-2019

Transformer Type
Applicability	Buildings with large electric service
Definition	Transformers can be classified as either dry type or liquid filled (usually oil)
Units	List: dry type, liquid filled
Input Restrictions	Transformers can be modeled or not at the discretion of the energy modeler. If they are more efficient than the requirements in Standard 90.1-2019, then they must be modeled in order to take credit.
Baseline Building	If transformers are modeled in the proposed design, then they must also be modeled in the baseline building

Transformer Efficiency
Applicability	When transformers are modeled for the proposed design
Definition	The efficiency with which transformers transfer electricity from the grid to the building or from onsite generators to the grid.
Units	Percent (%)
Input Restrictions	For new construction, transformers must meet or exceed the efficiency requirements in Table 8.4.4 of Standard 90.1-2019
Baseline Building	Efficiency shall be taken from Table 8.4.4. of Standard 90.1-2019