STK Bushing Purchase Description Draft.pdf
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- Solicitation number
- PANNWD-27-P-0000034782
About this file
This document is a technical specification for procurement of an oil-to-outdoor, dry-type, capacitively graded Resin Impregnated Synthetic (RIS) bushing with silicone rubber insulator that must conform to IEEE Standard C57.19.01-2017. The bushing shall have a voltage class of 34.5kV with a nominal system voltage of 25 kV, rated continuous current of 3200A to 4000A at 60 Hz frequency, and a lightning impulse (BIL) rating of 150 kV. The insulating body must be constructed of Resin Impregnated Synthetic material with a silicone rubber housing and corrosion-free aluminum alloy flange.
The bushing must meet specific dimensional and mounting requirements including a total length of 1315 mm (±1.1"), length above flange of 540 mm (±1"), and length below flange of 775 mm (±0.1"). The unit shall be capable of installation at any mounting angle from 0 to 90 degrees and operate in ambient temperatures ranging from -67°F to 131°F (-55°C to 55°C). Terminal connections include a 3"-12UN-2A silver-plated thread on the upper side and a matching thread on the lower oil side with an 80 mm copper terminal length. The flange features an outer diameter of 290 mm, bolt circle diameter of 235 mm, and six mounting holes of 22.2 mm diameter spaced at 60° intervals with a 30° offset. The CT pocket space (E-dimension) is specified at 534 mm with a maximum bushing body outer diameter below the flange of 133 mm.
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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).
File details come from the government source that posted it. Updated .