STK Bushing Purchase Description Draft
Updated
A PDF document (60 KB) attached to USACE Kansas City District - Stockton Dam and Powerhouse Procurement - Resin Impregnated Synthetic (RIS) Bushings, from the Department of the Army. Due Nov 6, 2026, 12:00 PM (UTC-6).
File name: STK Bushing Purchase Description Draft.pdf
The full file is for paid members, or buy this bid alone.
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1. General Description This requirement is for the procurement of an oil-to-outdoor, dry-type, capacitively graded Resin Impregnated Synthetic (RIS) bushing with a silicone rubber insulator. The bushing shall conform to IEEE Std C57.19.01-2017
2. Electrical Characteristics
a. Voltage Class: 34.5kV
b. Nominal System Voltage: 25 kV
c. Rated Continuous Current: 3200A - 4000A
d. Rated Frequency: 60 Hz
e. Lightning Impulse (BIL): 150 kV
3. Mechanical & Physical Properties
a. Insulating Body: Resin Impregnated Synthetic (RIS)
b. Housing: silicone rubber insulator.
c. Flange: Corrosion-free aluminum alloy.
4. Operating Conditions
a. Mounting Angle: Capable of installation at any angle from 0 to 90 degrees. b. Ambient Temperature Range: -67°F to 131°F (-55°C to 55°C)
5. Dimensional Requirements
a. Total Length: 1315 mm [51.77"] +/- 1.1”
b. Length Above Flange (Outdoor side): 540 mm [21.26"] +/- 1” c. Length Below Flange (Oil side): 775 mm [30.51"] +/- 0.1”
6. Terminal Connections
a. Upper Terminal (Top Side):
i. Thread 3"-12UN-2A (Silver plated);
b. Lower Section (Oil Side):
i. Bushing Body Outer Diameter (Below Flange) max ø133 mm [5.24"]; ii. CT Pocket Space (E-dimension) 534 mm [21"];
iii. Copper Terminal Length 80 mm [3.15"] +/- .1
iv. Bottom Terminal Thread 3"-12UN-2A.
7. 7. Flange & Mounting Details
a. Outer Flange Diameter: ø290 mm [11-11.5"]
b. Bolt Circle Diameter (BCD): ø235 mm [9.25"]
c. Mounting Holes: 6 holes, each ø22.2 mm [0.87"], spaced at 60° (with a 30° offset relative to centerlines).
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