Lineman chapter 12,13 Exam
Questions with Solutions Newest |
Already Graded A+
If a recloser is bypassed with a solid jumper or switch, what is the consequence if a
conductor fails to the ground somewhere downstream? - Answer- There's no form of
protection of protection, maybe no form of protection to trip out the circuit de energize
the circuit
What are three influences that affect the magnitude of a fault current during a short
circuit - Answer- Size of the Transformer, short distance of a larger conductor create low
resistance path for more current, low resistance path provides greater capacity to carry
high voltage
Name three reasons why a circuit needs protection - Answer- Limit time people are
exposed to hazard voltage and current as fallen conductor, limits time equipment is
exposed to hazards voltage, minimizes the customer outages
Name four types of faults that relays can be programmed to detect on a transmission
line system - Answer- Over current relent, over and under voltage relay, differential
relay
Why is a good multi grounded neutral important for circuit protection on a wye system? -
Answer- Neutral provides the best return path back to the source for fault, fault current
must make a complete circuit before it can trip out
Why does dry tree limb or broken conductor lying on a dry or frozen ground not always
trip out the circuit protection? - Answer- High resistance fault does not provide a good
path for current flow
What is meant by the frame size of the recloser? - Answer- Frame size is the size of the
capability of a unit, frame needs to have connects and trips big enough to trip out if it
accord at a location
Name three advantages for converting to a higher distribution voltage - Answer- Breaker
or re-closer seek out father, higher voltage feeder and feed much more load, fewer
substations are needed, a higher voltage feeder would have less load current therefore
less voltage drop, higher voltage feeder feed much more load
What is the most common cause of over voltage on a distribution system? - Answer-
Lighting
Questions with Solutions Newest |
Already Graded A+
If a recloser is bypassed with a solid jumper or switch, what is the consequence if a
conductor fails to the ground somewhere downstream? - Answer- There's no form of
protection of protection, maybe no form of protection to trip out the circuit de energize
the circuit
What are three influences that affect the magnitude of a fault current during a short
circuit - Answer- Size of the Transformer, short distance of a larger conductor create low
resistance path for more current, low resistance path provides greater capacity to carry
high voltage
Name three reasons why a circuit needs protection - Answer- Limit time people are
exposed to hazard voltage and current as fallen conductor, limits time equipment is
exposed to hazards voltage, minimizes the customer outages
Name four types of faults that relays can be programmed to detect on a transmission
line system - Answer- Over current relent, over and under voltage relay, differential
relay
Why is a good multi grounded neutral important for circuit protection on a wye system? -
Answer- Neutral provides the best return path back to the source for fault, fault current
must make a complete circuit before it can trip out
Why does dry tree limb or broken conductor lying on a dry or frozen ground not always
trip out the circuit protection? - Answer- High resistance fault does not provide a good
path for current flow
What is meant by the frame size of the recloser? - Answer- Frame size is the size of the
capability of a unit, frame needs to have connects and trips big enough to trip out if it
accord at a location
Name three advantages for converting to a higher distribution voltage - Answer- Breaker
or re-closer seek out father, higher voltage feeder and feed much more load, fewer
substations are needed, a higher voltage feeder would have less load current therefore
less voltage drop, higher voltage feeder feed much more load
What is the most common cause of over voltage on a distribution system? - Answer-
Lighting
