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
Only one type of air-break switch is used in a substation to isolate all circuits and equipment.
False
The switch that opens a circuit or conductor at two points has a construction classification of ? .
B
Sulfur hexafluoride gas used in interrupter switches to extinguish an arc is also known as ? .
SF6
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.
tilting-insulator
The apparatuses that protect the main contacts of an air switch during opening and closing operations are called ? .
Arcing Horns
