O+M Training Handbook on Circuit Breakers Flashcards
1
Q
What is plasma?
A
State of matter in which electrons are removed from atoms/molecules creating an electrically conducting gas
2
Q
Plasma’s function in a circuit breaker?
A
allows instantaneous current flow between open contacts
3
Q
Why must high pressure air be dry in air blast circuit breakers?
A
Because it is the insulating medium between the contacts
4
Q
Purpose of SF6 in air blast breakers?
A
To insulate the column support
5
Q
What is the purpose of the blast valve in air blast circuit breakers?
A
Blow arc from stationary fingers to an arcing probe
