Font size
WorksheetsY1W2 Electrical systems
Total questions: 30
Worksheet time: 16mins
4 main parts to the electrical system
Nuclear, Gas, Coal and Hydro
AC, DC, Current, and Voltage
Generation, Transmission, Substation, and Distribution
Wye-Wye, Wye-Delta, Delta-Delta, Open Wye-closed Wye
Transmission voltage
230kv-765kv
13.8kv-24kv
44kv-138kv
2kv-34.5kv
NERC stands for North American Electric Reliability Corporation
False
True
Which of the following is NOT a type of protective equipment on a distribution line?
Fused cut outs
Reclosers
Guy guards
Lightning/surge arrestors
Which of the following is NOT a function of a substation?
Change voltage of circuits up or down
Generate power to transmit across open right of ways
Connect or disconnect lines or equipment from each other
Control the flow of power by adjusting voltage and current
__________Improve efficiency of the circuit by introducing capacitive reactance on the circuit to counteract negative effects of inductive reactance caused by transformers and customer owned equipment
Fused cutouts
Capacitors
Regulators
Switchgear
44kv-138kv is
Generation voltage
Distribution voltage
Sub Transmission
Transmission
Conductor bundles are generally found on distribution lines and can be 2, 3, or 4 per phase
False
True
Radial circuits have how many alternate sources to back feed from should a circuit need to be cleared
3
2
0
4
Service lines run
Pole to pole
Pole to house
Pole to transformer
Underground pedestal to house
Delta distribution systems have 3 conductors plus a neutral
True
False
Voltage is stepped up right outside of
Distribution Substation
Generating facility
Transmission substation
Customers home
Common purpose of generating stations
Generate power as efficiently as possible
Protect the environment
Produce massive amounts of electricity
Produce 765kv
Transmission voltage is
2kv-34.5kv
44kv-138kv
230kv-765kv
120v-240v
What is NOT an advantage of fossil-fired generation
Relatively cheap fuel
Unlimited supply
High production capacity
Site location
Dispersed ———— generation is unique because it is located within and connected directly to the distribution system
Mega
Micro
Dual
Shared
Lattice towers are more aesthetically pleasing and take up less space than tubular towers
True
False
Network Grid is typically found in
Rural areas
Suburban areas
Industrial parks
Large cities with high rise buildings
DC transmission is used when
Large amounts of power need to be transmitted over long distances
Large amounts of power transmitted short distances
Large amounts of power stored in conductors
When cost is not an issue
Transmission Substation only containing equipment for connecting or disconnecting lines or equipment
Switch yards or switching stations
Rail yard
Transfer station
Mega yard
Select all of the following that apply to distribution substations
Step voltage up
Distribute power to customers
Located in load centers
Have circuit breakers to isolate station from fault on lines
What is not true of power transformers
Transform high voltages to lower voltages
Typically single phase units
Equipped with a load tap changer
Typically three phase units
Substation Disconnect switches are designed to interrupt load.
False
True
_____ and _____ transformers in a substation reduce current and voltage to levels that can be measured
Large
Current
Two-way
Potential
Control house in the substation contains (select all that apply)
Relays
Metering equipment
DC battery banks in case of power outages at the station
Break room for crews in the area
Ground grid inside the substation minimizes difference of ____ between equipment and ground
Phasing
Current
Temperature
Potential
Design considerations for substations include all except for
Oil spill containment
Electromagnetic field size
Bathroom access for utility crews
Appearance
Average distribution span
300ft
1000ft
275ft
520ft
_____ are used to reduce primary voltage to secondary voltage
Capacitors
Reclosers
Transformers
Fuses
Excessive ______ causes the fuse door to drop open
Voltage
Amperage
Heat
Cold
