STK Bushing Purchase Description Draft.pdf
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- Solicitation number
- W912DQ27SS4782
About this file
This document is a technical specification for the procurement of an oil-to-outdoor, dry-type, capacitively graded Resin Impregnated Synthetic (RIS) bushing with a silicone rubber insulator. The bushing must conform to IEEE Standard C57.19.01-2017 and is designed for use in electrical applications requiring high-voltage isolation. The electrical specifications include a voltage class of 34.5 kV, nominal system voltage of 25 kV, rated continuous current of 3,200 to 4,000 amperes, 60 Hz frequency rating, and a lightning impulse (BIL) rating of 150 kV. The insulating body shall be constructed from Resin Impregnated Synthetic material with a silicone rubber insulator housing and a corrosion-free aluminum alloy flange.
The bushing must meet specific dimensional, mechanical, and operational requirements. Total length is specified at 1,315 mm with length above flange at 540 mm and length below flange at 775 mm, each with defined tolerances. The unit must be capable of installation at mounting angles from 0 to 90 degrees and operate across an ambient temperature range of -55°C to 55°C. Terminal connections include a 3"-12UN-2A silver-plated thread on the upper terminal and a matching thread on the bottom terminal with an 80 mm copper terminal length. The flange has an outer diameter of 290 mm with a bolt circle diameter of 235 mm and includes six mounting holes, each 22.2 mm in diameter, spaced at 60-degree intervals with a 30-degree offset relative to centerlines.
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Text version
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).
File details come from the government source that posted it. Updated .