Statement of Work North Substation SF6 Breaker Repair 08Oct21.pdf

HOLLOMAN AIR FORCE BASE

WORK TASK #9196768

PROJECT NAME: NORTH SUBSTATION SF6 BREAKER REPAIR

STATEMENT OF WORK

8 OCTOBER 2021

1. PROJECT SPECIFIC INFORMATION

a. Location: North Substation, Facility 81209

b. User Contact: Gary V. Stratton

c. Performance Period of Construction: 180 Days

d. Working Hours: Monday‐Friday (7:00 am to 5:00 pm)

e. Restricted Area (as defined in HAFB Instruction 31‐102): No

2. SCOPE OF WORK

General Requirements:

1. The Contractor shall furnish all labor, equipment, materials, tools, and transportation necessary to accomplish the work.

a. Contractor shall provide vehicle with lift capability as required for the overhaul.

b. Contractor shall obtain a portable toilet for their use at the site.

2. Any damaged areas shall be restored to match the existing construction.

3. The work area shall be kept reasonably clean at all times. The Contractor shall perform a complete cleanup of the work area at the end of the contract.

4. All debris shall be disposed of off the base by the Contractor.

5. Provide product submittals for major equipment for approval prior to ordering any materials.

Specific Requirements:

1. The Hitachi ABB SF6 Power Circuit Breaker (see included data sheet with model and serial numbers) has been inoperative since November 2020. The ABB HMB‐1 Operating

Mechanism appears to be at fault. The interrupter tanks have been holding pressure. A

Hitachi ABB ten‐year overhaul of the SF6 Breaker is to be accomplished. This will include the parts and work the overhaul entails (see Item 7). Also the HMB‐1 Operating Mechanism is to be replaced with a new updated HMB‐1.5 unit, suitable for the SF6 breaker.

2. The 49 CES Electric Shop will de‐energize, isolate, and ground the SF6 breaker. Any switching or energizing of circuits or the state of the equipment in the North Substation will be done by the Electric Shop. One hundred twenty volt AC power will be available at the work site.

3. The Contractor will perform acceptance tests to the project manager’s and Electric Shop’s satisfaction to verify the breaker is able to function normally. Data from the tests are to be provided to the project manager and Electric Shop.

4. The original ABB HMB‐1 is to be given to the 49 CES Electric Shop. Any leftover usable parts, new or used, are to be turned over to the Electric Shop. All manuals and reference material that come with the new equipment are to be given to the Electric Shop. A report of the contractor’s work on the breaker will be provided to the project manager.

5. Hitachi ABB service guidelines shall be followed during this project. The Contractor’s technicians shall be fully qualified. Qualifications include pertinent educational training, applicable factory training, and experience working on Hitachi ABB SF6 Breaker systems to include design, assembly, installation, and testing. The Contractor shall provide documentation of this requirement.

6. The short term character of this service allows the Contractor to be escorted to the job site.

Otherwise the Contractor will be required to follow the 49 Contracting Squadron’s visitor access request procedures which will be provided if necessary.

7. List of tasks and items Hitachi ABB Power Grids recommended for 10 year overhaul (not to be considered all inclusive):

‐Degas breaker.

‐Remove rear tank covers, remove bushings, remove thru‐rod from bushings.

‐Remove rear end of interrupter and inspect contacts.

‐Replace all disturbed O‐rings and grease flanges.

‐Replace desiccant from each pole unit.

‐Re‐assemble interrupters.

‐Install thru‐rods with new O‐rings and grease into bushings.

‐Stab bushings into interrupters.

‐Pull vacuum on breaker down to 1 torr and hold for an additional hour.

‐Fill breaker with dry/pure SF6 gas to 87PSI.

‐Close breaker and perform Micro‐Ohm test.

‐Take gas sample and check for moisture levels (below 200PPMV) and purity (at least 97%)

‐Perform timing and speed test for proper operation.

‐Perform alarm test.

END OF STATEMENT OF WORK