W912EF26RA003 Amendment 0008 JDA_and_LSR_Average_Impedance.pdf

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Spare Transformers for the Lower Snake River Plants
Solicitation number
W912EF26RA003
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This is a technical specification document containing nameplate impedance data for Generator Step-Up (GSU) transformers at multiple federal hydroelectric dam facilities. The document presents IEEE C57.12.00 impedance requirements and measurements for transformer units at John Day Dam, Lower Monumental Dam, Little Goose Dam, and Lower Snake River facilities. The impedance data is organized in tabular format showing multiple transformer configurations designated as T1A through T3C with H-X and H-Y winding combinations, with impedance values ranging approximately from 9.10% to 17.94%. The document specifies that impedance tolerances for 3-winding transformers are ±10% of the specified value, and impedance variation between duplicate 3-winding transformers is also limited to ±10%.

The document explicitly notes that the John Day Dam data is not relevant to acquisition W912EF26RA003, indicating this is supporting technical reference material for a separate procurement action. The Lower Snake River T2 GSU Transformers section shows average impedance of 9.34%, while impedance data from other locations averages 17.62%. This appears to be a technical attachment providing baseline transformer specifications for comparative analysis or replacement procurement purposes related to federal hydroelectric power generation infrastructure.

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T1 A

H -X

T1 A

H -Y

T1 B

H -X

T1 B

H -X

T1 C

H -X

T1 C

H -Y

T2 A

H -X

T2 A

H -Y

T2 B

H -X

T2 B

H -X

T2 C

H -X

T2 C

H -Y

T3 A

H -X

T3 A

H -Y

T3 B

H -X

T3 B

H -X

T3 C

H -X

T3 C

H -Y

T2 A

H -X

T2 A

H -Y

T2 B

H -X

T2 B

H -X

T2 C

H -X

T2 C

H -Y

T1 A

H -X

T1 A

H -Y

T1 B

H -X

T1 B

H -X

T1 C

H -X

T1 C

H -Y

T1 A

H -X

T1 A

H -Y

T1 B

H -X

T1 B

H -X

T1 C

H -X

T1 C

H -Y

T1 A

H -X

T1 A

H -Y

T1 B

H -X

T1 B

H -X

T1 C

H -X

T1 C

H -Y

17.48 17.66 17.42 17.38 17.56 17.66 17.83 17.94 17.38 17.57 17.66 17.57 17.77 17.94 17.60 17.60 17.83 17.94 17.40 17.50 17.66 17.70 17.66 17.80 17.80 17.50 17.50 17.60 17.40 17.50 17.56 17.66 17.83 17.66 17.63 17.70 17.44 17.70 17.50 17.60 17.40 17.40

T2 A

H -X

T2 A

H -Y

T2 B

H -X

T2 B

H -X

T2 C

H -X

T2 C

H -Y

T2 A

H -X

T2 A

H -Y

T2 B

H -X

T2 B

H -X

T2 C

H -X

T2 C

H -Y

T2 A

H -X

T2 A

H -Y

T2 B

H -X

T2 B

H -X

T2 C

H -X

T2 C

H -Y

9.20 9.60 9.10 9.50 9.30 9.60 9.20 9.60 9.10 9.60 9.30 9.60 9.10 9.40 9.10 9.40 9.10 9.30

IEEE C57.12.00 Impedance Requirements:

Little Goose Lower Ganite

Average %Z = 9.34

Lower Ganite

Average %Z = 17.62

Nameplate Impedances for John Day GSU Transformers and LSR T1 John Day Lower Monumental Little Goose

► Impedance the impedance for a 3-winding transformers is ± 10% of the specified value ► Impedance between duplicate 3 winding transformers is ± 10% of the specified value

Nameplate Impedances for Lower Snake River T2 GSU Transformers Lower Monumental

The above data regarding John Day Dam is not relevant to this acquisition, W912EF26RA003.

Combined LST T1 and JDA (2)

File details come from the government source that posted it. Updated .