Journeyman Test Flashcards
Define a clearance
An assurance from a switching authority that a specified power system is isolated and will not be ordered re energized until that worker reports the crew in the clear and the equipment ready for service
What is required before a clearance
Visual opens and tags
How to obtain a clearance
Call dispatch give name company name time and circuit number and tell them you are requesting a clearance at your location and your tagged open points
How are capacitors hooked up
Series in substations parallel in distribution circuits
What are discharge resistors
Located inside capacitors to discharge capacitance
How do you take a capacitor offline
Load break cut outs open
Remove high sides
Wait five minutes
Test and ground high sides
Shunt high sides
What are capacitors rated in
Kvars
What is capacitance measured in
Ferrads
How do you take a regulator bank off line
Turn scada off
Set to manual
Step to zero
Verify neutral 3 ways (light,tester,dial)
Pull motor fuse
Close bypass
Open source and load disconnects
Turn reg bank controls to off
What is a reclosure and how does it work
A device that senses fault current and will open a line but will close back and will open a line but will close back in on the fault around 3 times until the fault is cleared or the recloser will stay in the open position can also be set to one shot capabilities in the event there is a worker on the line
What is a hotline hold
A setting option on a recloser that is a “trip sensitive” setting meaning in the event of any type of fault the recloser will open the line incredibly quickly used when doing hot work generally
What is an eye splice good for
90% of the ropes breaking strength
What is the current on a series street light circuit
What are fiberglass sticks tested at
100kv for five minutes per foot
What are wood hot sticks tested at
75000 volts per foot for five minutes
What is required after 4 ft of climbing
100% tie in
How many secondary bushings on cans 100kva and above
4
A customer has a 10hp motor what size can is needed
7.5 kva
What should you do before pulling a bayonet fuse
Pull the bleeder valve
How much weight can you put on a latter
2.5 times the weight of the latter
Ohms law ?
E=I(R)
Why should transformers have similar resistance
The lower resistance can will carry all of the load causing the other to overheat
What is a lighting arrestor
A device that diverts over current to ground protecting the equipment it is in parallel with
Means of re energization
Lightning back feed induction accidental contact with energized lines occurring from a car hit pole for example or accidental energization from human error
Mad on 13.2
2 ft 3
Mad on 34.5
3 ft
Mad on 115
3 ft 9
Mad on 230
6 ft 2
What is considered high voltage
600 volts
Define a neutral
A current carrying conductor at ground potential tied to the substation ground grid and serves as a return of the imbalance of the system
How to find guy tension
Guy length divided by anchor lead times the line tension
What are five things a lineman can do alone
Refuse cut outs with a hot stick
Operate switch with handle or hot stick
Install or remove hot tap (not dropping or picking up load)
Remove load metering device
Emergency repair to keep public safe
Define climbing space
A Clear section of the pole to climb and avoid hazards
Define an EPZ
A parallel shunt placed around the worker to keep fault current at an acceptably low level traveling through the worker
What happens when you ground one phase on a delta line
Nothing will happen if there are no other grounds on the line your allowed one ground on a delta system
1 HP is equal to how many watts
746 watts
Difference between k fuses and T fuses
Quick
Times
Why must switches be timed properly
If one switch opens quicker than the others a massive amount of arcing can occur
How does a sectionilzer work
Works in conjunction with a recloser down stream to isolate a section of line. Will not open under load but can pick up load
Two types of electrical contact
Direct and indirect
How do you find guy length
A2+b2=c2
What are the minimum amount of wraps on a wire drum
4 wraps
Define voltage
Electrical pressure wich is a force that pushes current
What is ohms law
1 volt will push 1 amp through 1 ohm of resistance
Define electrical frequency
Number of complete wave forms completed in one second unit of measurement
What is a recloser and how’s it work
A recloser is a device that senses and interrupts fault current and automatically restores the power up to three times if the fault is not cleared it will stay open. Also has one shot capabilities used when workers are on the line
How would you use a rotation meter and why
Three phase secondary applications. Take each leg of the three phase motor to the hot secondary legs taped and identified properly to find rotation to either match that rotation with a new bank you are installing or to make sure you are giving the customer the required rotation
What is on a tailboard
Hazards energy source controls work procedures special precautions ppe
What is skin effect
92 percent of electrons travel on outside of conductor
What is a radial feed
Only one place where source voltage can originate
What is a loop feed
Two or more places where source voltage can originate from
When are ground required
De energized lines where nominal voltage is 600 volts and up
What must a ground rods resistance be
25 ohms
What is a rotation meter
A three phase motor used to identify phasing sequence
What is step potential
The difference of potential between two points on the earth caused by gradient rings
What is touch potential
The difference between an object and the potential of the ground
How much more efficient is wye circuits over delta
73 percent more efficient
Why is wye more efficient than delta
Higher voltage and less amperage
What are the four sagging methods
Return wave targets transit and dyno
What are d rings rated for
5,000 pounds
What class are hard hats
Class e
Can you rubber glove 5kv
Yes
Why does a gang switch have a ground mat
To create an epz around the worker
What is Carona
Tendencies of electrons to leave a conductor at high voltages due to sharp objects
What is the nominal voltage of a pt
120 volts
How many amps are on the low side of a pt
5
What is ocb
Oil circuit breakee
What has more windings on a step down transformer
The primary side
What has more windings on a step up transformer
The secondary side
How do you find approximate dead end tension
Ubs of wire divided by safety factor of five
How do you find if a transformer is over or under loaded
e(I)/1000
How do you find power factor
Generation/load
What is current
Flow of electrons through a conductor
What is resistance
Opposition of current flow
What is an automatic transformer
Transformers with Load capable tap changers with one series coil commonly found in substations
