Sf6 Circuit Breakers
Gas that is an excellent Insulator
SF6 Gas
SF6 gas purification involves removal of both?
What is SF6 breakdown products and moisture.
Two primary alloys of station steel structures are?
What are iron and carbon.
Best practice to tighten a bolt.
What is holding the bolt and turning the nut.
Continually high LTC liquid level may be an indication of?
What is oil entering the LTC compartment from the main tank.
Pressurized SF6 gas increases this quality.
What is insulating quality
This used to collect, store, purify, evacuate and reclaim sf6 gas.
What is a SF6 reclaimer.
This should be done after all major members of the structure are in place.
What is tighten up all structural bolts on the steel.
Vertical steel structures are called?
What are column and towers.
This must be done prior to oil removal on a Sealed LTC compartment?
What is it must be vented and purged with nitrogen to exhaust potentially explosive gases.
Moisture is tested in SF6 gas using a _____?
What is a Dew point tester.
After momentarily energizing the vacuum pump and the motor does not run due to an interlocking device what should be done?
What is reverse phasing by reversing power cable connections at the power source or at the circuit breaker.
Horizontal steel structures members are called
What are beams, trusses, and girders.
All vertical structures should be checked ________ and horizontal structures should be checked ________?
What is plum and level.
It is not uncommon for the LTC Compartment oil temperature to be a minimum of 10 degrees C above this?
What is the main tank oil temperature.
These are not routinely opened for inspection?
What are SF6 gas breaker interrupters.
This must be done on the hose before pulling SF6 gas from the breaker.
What is create a vacuum on the hose.
Used to reinforce the attachments of beams and columns.
What are gusset plates.
Things to look for during inspection on on slings and rigging equipment before hoisting or lifting steel include.
What is Deterioration, broken fibers, kinks, cuts and that load rating tags are properly attached.
Vacuum LTC oil can typically be found?
What is clean with no carbon contamination.
Prior to disconnecting the SF6 test device you should?
What is close the sample valve.
During the recovery process the SF6 gas passes through these to remove foreign particles, moisture and decomposition products.
What are filters.
Prefix letter that all steel has that is part of their ASTM classifications.
What is the letter A.
This must be used to coat damaged galvanized surfaces, including field cuts and/or field drilled holes that have been mechanically cleaned.
What is cold galvanized compound.
Typical number of LTC tap postions?
What is 33.