equipment identification Flashcards
There are ? steps that are common to the installation of all substation equipment.
7
The minimum separation between bare live conductors in a substation (phase-to-phase) for 69 kilovolts is ?
31”
The minimum clearance for 115 kilovolts from a live conductor to the substation lattice structure is ?
42”
Sulfur hexafluoride (SF6) gas is a common arc quenching medium used in new substation ?
circuit breakers
SF6 gas ? and will displace the air at the bottom of a confined space.
is heavier than air
Substation breakers are often defined by their ? and their type of operating mechanism.
insulating medium
Substation circuit breakers can be operated by ? or ? controls.
ac or DC
In new substations of 500 kilovolts, individual single-phase transformers are used because 3-phase transformers at these voltages are extremely large and expensive.
true
Disconnects in a substation cannot be used as grounding devices.
false
Step regulators normally provide 5% or ? regulation.
10%
The purpose of installing capacitors in a substation is to reduce ?
line losses
After switching a substation capacitor, wait at least ? minutes before applying a ground.
5
The reactor used to counter phase-to-ground capacitance is connected phase-to-ground and is called a(n) ? reactor.
shunt
The most common type of battery used for direct current power in a substation is the ? cell.
lead acid
In substation metering, a VT and a PT are two different types of instrument transformers.
false
