air switches Flashcards
A disconnect in a substation designed to open or close three disconnects at the same time is called a(n) ? disconnect (switch).
gang operated
For an operator’s safety, a solid copper wire grounds the swing-handle used to operate a switch in a substation yard.
false
There are ? types of operating mechanisms used to operate a 3-phase switch.
3
One purpose of a substation disconnect is to perform as a(n)
grounding device
According to the reference, substation disconnects have ? main functions.
5
If a load is large, over ? , it must be broken by a circuit breaker and not with a switch.
50A
The OSHA standard for lockout/tagout is ?
1910.269 D
The metal mat that is installed at the base of a manually controlled air-break switch forms a perfect equipotential zone and offers 100% protection should the switch mechanism become energized during operation.
false
The switch that is most commonly used to ground a line to the substation structure after it has been de-energized is a ? switch.
single blade
The switch that opens a circuit or conductor at two points has a construction classification of ?
b
If operating properly, a switch that uses sulfur hexafluoride “bottles” operates ?
de energized and arc free
The ? switch is no longer installed, but may still be in use in older substations.
titling insulator
The apparatuses that protect the main contacts of an air switch during opening and closing operations are called ?
arcing horns
A disconnecting or isolating switch is designed to open or close when ? current is broken or flowing.
negligible
Three typical applications for isolating switches include equipment by-passing, power transformer isolation, and ?
bus sectionalizing
