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Electrical systems chapter 4
Northwest lineman college holloway
30
Electrical Engineering
Professional
01/28/2015

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Term
WYE
Definition
This system is a 4 wire circuit.
Has 3 phases with a neutral conductor.
Term
Delta or ungrounded wye
Definition
This system that is part of distribution has 3 phases with no neutral.
Term
Phase
Definition
What an energized wire is referred to as
Term
Distribution Circuit
Definition
This circuit is composed of three phases and a neutral or just three phases. Also consists of main lines and tap lines.
Term
Main line
Definition
Also known as feeder lines. Is the line that comes from substation and tap lines will feed off of.
Term
Tap lines
Definition
Feeds off main line to deliver power to customers. Are often identified by smaller equipment
Can be 3 single or v phase
Term
Receive power from sub transmission system to distribute to customers at ideal voltages.
Definition
What is the primary function of distribution
Term
Loop design
Definition
Circuit that has power fed from 2 sides which keeps power going incase of a fault
Term
Radial design
Definition
Circuit with power feeding from only one side
Term
Primary
Definition
High voltage portion of distribution.
2kV - 34.5kV
Term
Secondary
Definition
Low voltage portion of distribution that runs pole to pole or pad mount to pedestal in underground systems
120-480 volts
Term
Services
Definition
Low voltage portion system that goes directly to customers meter base
Term
Residential
Commercial
Agricultral
Industrial
Definition
Different classifications of utility customers
Term
transmission & sub-transmission
Definition
what 2 forms of power delivery that has no neutral
Term
Phase to ground
Definition
what does the lower number represent
7200/12470
Term
phase to phase
Definition
what does the higher number represent
7200/12470
Term
114-126
Definition
Utilities are obligated to provide this voltage range to customer. Also what is that percentage
Term
System voltage
Definition
what part is phase to phase
Term
line voltage
Definition
what part is phase to ground
Term
3
Definition
How many phases do circuits always have
Term
AC
because it can be transformed
Definition
what kind of power is distribution
and why
Term
No longer than 50 miles
300 feet
Definition
how long are distribution lines typically and how far apart are the structures on average
Term
Aluminum
Definition
What are the conductors of a distribution line made out of
Term
Density of the area & types of customers and capability of the circuit
Definition
number of customers on a circuit are determined by what
Term
Residential
Definition
customer dwellings are known as
Term
commercial
Definition
stores, shopping centers, and medical facilities are what kind of customers
Term
agricultural
Definition
irrigation pumps, grain storage, and dairies are what kind of customers
Term
industrial
Definition
large manufacturing plants, refineries are what kind of customers
Term
existing system voltages
Definition
voltage level of the circuit is typically based upon what
Term
Cant be seen
Definition
why do customers prefer underground circuits
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