3-5-3 Substations - Equipment Identification Flashcards
This lesson presents __?__ major installation steps when installing substation equipment.
7
The minimum separation between bare live conductors in a substation (phase-to-phase) for 69 kV is __?__.
31”
The minimum clearance for 115 kV 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/DC
In new substations of 500 kV, 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
Post insulators found in modern substations are normally porcelain or polymeric.
True
Step regulators normally provide 5% or __?__ regulation.
10%
In a five percent substation step regulator, there are a total of __?__ steps.
16
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
A substation __?__ is used on primary high voltage lines and buses to produce a lower voltage that is an exact fractional representation of the primary voltage.
coupling capacitor
The most common type of substation is called a(n) __?__-insulated substation.
air
An electrical line inside a substation yard made out of an aluminum-alloy pipe is called a __?__.
bus
A(n) __?__ is used in a substation to filter out high-frequency communication signals on the power conductors.
wave trap
A thermography (infrared) survey of a substation will point out any connections, splices, and switch components that are hot.
True
