f.
Diagrammatic stainless steel or laser-etched anodized aluminum
nameplate.
g.
Transformer shall include ground pads, lifting lugs and provisions for
jacking under base. The transformer base construction shall be
suitable for using rollers or skidding in any direction. Provide
transformer top with an access handhole. The transformer shall have an
insulated low-voltage neutral bushing with lugs for ground cable, and
with removable ground strap.
h.
Transformer shall have the following accessories:
1.
Liquid-level indicator
2.
Pressure-vacuum gage
3.
Liquid temperature indicator
4.
Drain and filter valves
5.
Pressure relief device
[6.
Auxiliary cooling equipment and controls
[(a) Transformer shall have provisions for future addition of
automatically controlled fans for forced-air-cooling.]
[(b) Transformer shall be forced-air-cooled. Forced-air-cooling
fans shall have [automatic temperature control relay][winding
temperature indicator with sequence contacts].]]
[2.2.3.2
Specified Transformer Efficiency
**************************************************************************
NOTE: On other than LANTNAVFACENGCOM and
SOUTHNAVFACENGCOM projects, use "Specified
Transformer Efficiency". Delete "Specified
Transformer Losses", "Transformer Loss
Calculations", and "Deduct Clause".
Efficiency shall be specified based on NEMA TP 1
until actual loss values can be coordinated with
industry using life cycle cost economics.
**************************************************************************
Minimum efficiency, based on test results, shall not be less than NEMA
Class 1 efficiency as defined by NEMA TP 1.
a.
Tested transformer losses: Submit certification from the manufacturer,
with the submitted catalog data, to show conformance with the specified
efficiency requirements. The values used to determine the actual
efficiency shall be the tested no-load losses (NLL) (in watts) at a
reference temperature of 20 degrees C and the tested load losses (LL)
(in watts) at a reference temperature of 85 degrees C. If the
efficiency based on the aforementioned test results, is less than the
NEMA Class 1 efficiency, the transformer is unacceptable. Transformer
efficiency values at both full load and at one-half full load shall be
included on the routine test report.
SECTION 16361N
Page 19
Previous Page
