Oahe Dam Bus Duct Inspection
Uploaded by
mersiumOahe Dam Bus Duct Inspection
Uploaded by
mersiumISOLATED PHASE BUS DUCT
INSPECTION REPORT
OAHE DAM
28563 Powerhouse Road
Pierre, SD 57501
OWNER: US Army Corps of Engineers
GENERAL CONTRACTOR: CE Power Solutions
SUBCONTRACTOR: RMS Energy CO, LLC
RMS Energy CO, LLC.
1900 E. 66th Ave
Denver, CO 80229
Phone: 888-683-3630
UNIT #1
Opening access doors, gasket
material is deteriorated
C Phase access door opened
Split Cover
A Phase
Gasket
Material
remaining
on
enclosure
B Phase
Enclosure
C Phase enclosure
A phase conductor splice assembly. Silver plating is very
minimal, copper adapter plates are still flat and acceptable,
paint is flaking off the conductor
B Phase Conductor, splice plates in tact, silver
integrity is acceptable, flatness is acceptable.
Imprints on conductor shows that there is some
overheating present. Paint is flacking in some
areas.
C Phase Conductor, splice plates in tact, silver integrity is
acceptable, flatness is acceptable. Green residue on
conductor is from copper being wet. No signs of
overheating, no rust.
Excess gasket material was removed from outside enclosure
prior to installing new foam gasket material
Outside enclosure, new isolation/gasket material is
installed on both ends of the enclosure splice covers
1. The enclosure was wrapped twice around with
electrical grade tape,
2. Foam cord was installed,
3. One final wrap of electrical grade tape was used
over the cord to keep it in place and sealed.
Outside enclosure: new isolation/gasket material
installed
Old gasket
material is
completed
removed
from access
doorsurface
cleaned with
paint thinner
for optimal
adhesion of
new
material
New gasket
installed on split
covers
Installing new access door gasket
The access doors have an airtight seal
At the bottom of the bus penetration into the
concrete the base of the seal off bushing is
covered with dirt, debris, dead bugs and cobwebs
Isolated phase bus is
vacuumed, cleaned
and dusted.
No insulators were
replaced on this unit,
all were in good
condition; all reachable
Insulators were hand
wiped with lint free
rags and alcohol.
CLEAN
Surface was prepped for new caulking
New seal is installed: silicone caulk
Obvious area of water intrusion- rubber bellows are
completed shredded with gaping holes and tears
New rubber bellows installed- air pressure test
performed- PASS
Transformer connection: typical all three phases, Clean
Braids and bolting hardware removed, silvered contact
surfaces are acceptable, flatness is acceptable
This is evidence that the main source of water intrusion
was at the rubber bellows
Rain shields installed over vertical
sections of split covers- painted
Area cleaned upon
completion
RMS Conclusion/Recommendations/Comments:
Bus was fairly clean on the inside, it was easily detected where
the water was being introduced into the system at the rubber
bellows located at the connection of the transformer. The
bellows were replaced and an air pressure test was performed
to validate the seal.
It was evident that the water had sat in the bus for some time
and dripped down causing some discoloration. All-in-all the
insulators were fairly clean and the bus was in good shape.
None of the connections needed to be silver plated the
surfaces were flat.
RMS hand wiped reachable insulators with alcohol and lint free
rags, dusted the inside of the bus (enclosure and conductor),
and vacuumed the dirt, debris and cob webs from the bus.
New gasket material was put on the enclosure split covers and
access doors as well as the doghouse covers.
The concrete penetration was cleaned up and resealed.
The area around the transformer was cleaned of all dirt and
debris.
Rain shields were installed over the vertical sections of bus
above the split covers as an extra measure to ensure no water
would enter the bus.
No insulators were replaced on this Unit.
A final inspection and approval was performed by site contact
Dan Palecek of the US Army Corps of Engineers.
Current inspections per bus manufacturers' is that the bus is
opened up and inspected at each scheduled outage or every
12-18 months.