R16PS00876_Specifications.pdf

Specification for HV Bushing Type O plus, Style 362A1600AA, for a Single Phase Westinghouse Transformer Model GMB2027-08

Background: The High Voltage (HV) bushing function is to provide electrical insulation and gradually decrease the electrical stress between the transformer and power line. As bushings aged, the operational values required to guarantee safe operation decrease and the bushing need to be replaced.

Hoover Dam is looking to purchase four (4) to replace HV bushing type O Style 362A1600AA, no longer manufactured. The manufacturer recommendation for replacement is:

Part number Description Outline drawing

345Z2000AD O Plus C - 345.0 kV bushing

T345Z2000AD

These bushing will kept as spares and will be storage at the Hoover Dam warehouse. Hoover Dam is operated by the U.S. Bureau of Reclamation, Department of Interior.

Requirement: The Hoover Dam requires four (4) HV bushing type O Plus C - 345.0 kV bushing part number: 345Z2000AD, including required hardware for outdoor storage. The outdoor storage hardware shall hold the HV bushing without degradation for 20 years. Figure 1;

show an existing spare with the storage hardware provided by the manufacturer on 1985.

Figure 1, existing HV bushing type O, Style 362A1600AA, with outdoor storage hardware

R16PS00876

Salient features of the HV bushing:

Bushing style 345Z2000AD

Bushing outline drawing T345Z2000AD

Bushing type O Plus C

System voltage (kV) 345.0

BIL (kV) 1175

Rated current (A) Transformer 2000

Creep (in) 369.60

CT space (in) Transformer 23.00

Color Gray

Maximum altitude (ft) 8400.00

Mounting (from vertical) 0-30°