Current Transformer Ratings.pdf

PDF 141 KB Posted May 8, 2025

Attached to: Transformer Supply Multiple Award Contract
Solicitation number: W9127N25SS4221
Issued by: Department of the Army Corps of Engineers Engineering District Portland

About this file

Written by GovTribe AI · May 8, 2025

This Sources Sought attachment provides detailed specifications for transformer ratings across multiple voltage levels for a potential U.S. Army Corps of Engineers Transformer Supply Multiple Award Contract. The document includes comprehensive tables (Figures 1-4) detailing transformer specifications for 500kV, 230/161kV, 115kV, and Auto Transformers, with each table listing critical technical parameters such as high voltage rating, year built, phase configuration, cooling class, base MVA, maximum MVA, and number of units.

The tables capture transformers from different manufacturing years (ranging from 1953 to 2022), covering various configurations including Generator Step-Up (GSU) and Auto transformers with 1-phase and 3-phase options. Each transformer type is categorized by voltage rating (500kV, 230kV, 161kV, 115kV, and 13.8/115/230kV), with specific cooling classifications defined by IEEE standards. The document notes that procured MVA ratings may differ slightly from the listed specifications, and is part of a sources sought announcement for a potential multiple award contract with up to $500M capacity, targeting transformer replacements for hydropower plants managed by USACE, Bonneville Power Administration, and the Bureau of Reclamation.

View the file

On GovTribe

Work with this file

Download the original file
Contacts named in this file
Similar government files
Ask GovTribe AI about this file

Try for free Login

Text version

The file's text, extracted by GovTribe without its formatting.

Sources Sought: W9127N25SS4221 Transformer Supply Multiple Award Contract - Attachment

Current transformer ratings are provided below, see Figures 1-4. Procured MVA ratings may be slightly different.

Figure 1: 500kV Transformers High- Voltage Rating (KV)

Year Built 1-phase or

3-phase

GSU pr AUTO 2 or 3 winding

Cooling Class *

Base

MVA

Max MVA Number of units

500 1968- 1978 1-phase GSU 3 OA/FA 164 218.666 21

500 1973 1-phase GSU 3 OA/FA 121.5 162 3 500 1977 1-phase GSU 3 OA/FA 115 153.333 7 500 1978 1-phase GSU 3 OA/FA 82 109 9 500 1979 1-phase GSU 3 OA/FA 86.250 115 3 500 2008 1-phase GSU 3 ONAN/ONAF 121.5 162 1

*See Clause 5.1 IEEE C57.12.00 for definition of cooling classes

Figure 2: 230 and 161kV Transformers High- Voltage Rating (KV)

Year Built 1-phase or

3-phase

GSU pr AUTO 2 or 3 winding

Cooling Class *

Base

MVA

Max MVA Number of units

230 1953 1-phase GSU 2 FOW 29 - 5 230 1960 3-phase GSU 2 OAFA 36 48 2 230 1961 1-phase GSU 2 OFAF 68.667 - 9 230 1963 3-phase GSU 2 FOW 142 - 4 230 3-phase GSU 2 OA/FA 68.325 91 2 230 1973 3-phase GSU 2 FOA 208 233 3 230 1975 3-phase GSU 3 OA/FA 192 256 2 230 1981 3-phase GSU 3 FOA 344 - 3 230 1984 3-phase GSU 3 OA/FA 192 256 1

230 1984- 1986 1-phase GSU 3 FOW 124 - 13

230 1996 1-phase GSU 2 FOA 46 - 9

230 2001- 2005 1-phase GSU 3 ONAN/ONAF 53.33 66.667 22

230 2005- 2010 1-phase GSU 3

ONAN/

ONAF/

ONAF

40 66,667 21

230 2006 1-phase GSU 2 FOW 29 - 1 230 2007 3-phase GSU 3 ONAN/ONAF 192 256 1

230 2009- 2017 1-phase GSU 2

ONAN/

ONAF/

ONAF

37.800 63 5

230 2010 3-phase GSU 2 ODAF 128 - 3 230 2012 1-phase GSU 2 OFAF 68.667 - 1

230 2015- 2016 3-phase GSU 3 FOA 385 - 3

230 2017 3-phase GSU 2 OFAF/OFAF 208 233 1

230 2021 1-phase GSU 3

ONAN/

ONAF/

ONAF

40 66,667 1

230 2022 3-phase GSU 2 ONAN/ONAF 90 120 3 161 1970s 3-phase GSU 2 OF/AF 68.235 91.1 2 161 2011 3-phase GSU 2 OF/AF 41.25 55 1

Sources Sought: W9127N25SS4221 Transformer Supply Multiple Award Contract - Attachment

Figure 3: 115kV Transformers

Voltage Rating (KV)

Year Built 1-phase or

3-phase

GSU pr AUTO 2 or 3 winding

Cooling Class *

Base

MVA

Max MVA Number of units

115 1954- 1955 3-phase GSU 2 FOW 48 - 3

115 1955 3-phase GSU 2 OA/FA 13 17.3 1 115 1961 3-phase GSU 2 OF/AF 103 - 1

115 1961- 1962 3-phase GSU 2 FOW 109 - 3

115 1962 3-phase GSU 2 OA/FA 27 36 1 115 1968 3-phase GSU 2 OA/FA 18 24 1 115 1973 3-phase GSU 2 FOA 150 - 1 115 1975 3-phase GSU 2 FOA 134 - 2 115 1977 3-phase GSU 2 OA/FA 45 60 1 115 1996 1-phase GSU 2 FOA 69 - 6 115 2002 3-phase GSU 2 OA/FA 75 100 1

115 2006 1-phase GSU 1

ONAN/

ONAF/

ONAF

27.8 63 3

115 2007 1-phase GSU 3

ONAN/

ONAF/

ONAF

40 66,667 3

115 2010 3-phase GSU 2 ODAF 128 - 2 115 2011 3-phase GSU 2 ODAF 134 - 1 115 2014 3-phase GSU 2 ONAN/ONAF 37.5 50 3 115 2017 3-phase GSU 2 OA/FA 60 80 1

115 2018 1-phase GSU 1

ONAN/

ONAF/

ONAF

45 75 3

115 2020 3-phase GSU 2 ONAN/ONAF 15 20 3 115 2021 3-phase GSU 2 ONAN/ONAF 90 120 1

Figure 4: Auto Transformers

Voltage Rating (KV)

Year Built

1-phase or

3-phase

GSU pr AUTO 2 or 3 winding

Cooling Class *

Base

MVA

Max

MVA

Number of units

13.8/115/230 1953 1-phase Auto 3 OF/AF 26.666 35.556 3 13.8/115/230 1955 1-phase Auto 3 OF/AF 26.6 35.6 3 13.8/115/230 1986 3-phase Auto 3 OA 107 - 1 13.8/115/230 2005 3-phase Auto 3 ONAN/ONAF/ONAF 40 66,700 1 13.8/115/230 2012 3-phase Auto 3 ONAN/ONAF/ONAF 90 150 1 13.8/115/230 2015 3-phase Auto 3 ONAN/ONAF/ONAF 120 200 1

File details come from the government source that posted it. Updated May 8, 2025.