Term
| Fucntion of Transmission lines |
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Definition
| deliver large amounts of bulk power with a minimal loss |
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Term
| Why transmission lines use DC |
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Definition
| This line favors what power that loses less power |
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Term
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Definition
| DC transmission lines are designed to operate in a ____________ configuration |
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Term
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Definition
| Both sides of tower are both negative and positive |
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Term
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Definition
| grid uses this to tie generators and transmission lines together. Also disconnects and connects lines and equipment together |
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Term
Votlage of Line
Right of way size
Geographical Terrain
Weather
Size of conductor
Construction Considerations
Wether two circuits are required |
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Definition
| 7 FACTORS IN CHOOSING A STRUCTURE |
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Term
Wood Pole
Tubular Steel Pole
Lattice Type Steel |
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Definition
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Term
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Definition
Popular for Transmission and Sub-Transmission.
Voltages are 345 kV and below |
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Term
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Definition
| Popular because they are more aesthetically acceptable and longer life span. |
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Term
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Definition
Different variations.
Pieces of angle steel bolted together
345kV and above |
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Term
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Definition
| Critical to reliability of Transmission lines. |
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Term
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Definition
| What determines physical size of insulator |
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Term
Porcelain & Suspension
Porcelain Line Post
Polymer Suspension
Polymer Line Post |
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Definition
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Term
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Definition
| Reinforced with steel strands in center to add strength |
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Term
| Aluminum Conductor Steel Reinforced |
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Definition
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Term
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Definition
| Conductors that are grouped together to increase amperage capacity |
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Term
Length of line
Amount of power to be delivered
Voltage of existing system
Cost of loses |
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Definition
| Factors on Transmission voltages (4) |
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Term
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Definition
| on the pole, what provides a path for lighting to reach the ground |
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Term
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Definition
| Legal right to construct and maintain a line |
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Term
| Large cities where substations are in town |
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Definition
| Where are underground transmission lines usually found |
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Term
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Definition
| Do transmission lines often have neutral lines |
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Term
Electro magnetic fields
Geographical terrain
width of path |
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Definition
| 3 building factors of right aways |
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Term
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Definition
| what can determine width of right away |
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Term
Change voltage of circuits from one level to another
Connect/Disconnect lines or equipment from each other
Control flow of power by adjusting voltage and current |
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Definition
| 3 major functions of substations |
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Term
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Definition
| contains equipment that connects/disconnect lines or equipment from each other |
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Term
Generation
Transmission
Sub-Transmission
Distribution |
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Definition
| Different types of substations |
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Term
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Definition
Substation that steps up voltage from generators so it can be transported.
Interrupts flow of power on lines if trouble shall occur. |
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Term
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Definition
Changes a high voltage to a low voltage. Has several lines going in/out of substation.
Has large transformers to change voltage.
Large circuit breakers to disconnect/connect lines & equipment. |
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Term
| Sub-transmission substations |
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Definition
Located near large load centers.
Changes voltage for mid power |
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Term
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Definition
Located in middle of load center.
4-10 miles apart from each other
Changes voltage for customers |
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Term
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Definition
changes voltage from one level to another.
Can be large and contains insulating oil. |
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Term
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Definition
disconnect/connect lines and equipment.
Interrupts large amounts of current.
Uses oil, air, vacuum, or sulfur-hexafluoride |
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Term
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Definition
isolates lines and equipment to be worked on.
Manually operated by switchman |
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Term
| Current & Potential Transformers |
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Definition
| Provide reduction in voltage and current so that power flow can be measured also senses abnormal amounts of voltage and current |
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Term
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Definition
| assists controlling the flow of power on the system |
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Term
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Definition
| automatically adjust voltage as required. |
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Term
| 3 single phase units or 1 three phase unit |
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Definition
| amount of phases per unit in voltage regulators |
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Term
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Definition
Terminates lines entering and leaving station.
Used to mount switches, disconnect, bus conductors, and other equipment |
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Term
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Definition
| contains key control equipment such as relay meters & computers |
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Term
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Definition
| critical in helping workers and public to avoid hazards |
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Term
Appearance
Sounds
electromagnetic fields
oil spill containment
fencing |
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Definition
| Concern of public for substations |
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Term
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Definition
| Heavy with large volume of insulating oil |
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Term
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Definition
| Changes voltage from one circuit to another |
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Term
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Definition
| connects/disconnects line and equipment |
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Term
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Definition
| isolates lines and equipment to be worked on |
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Term
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Definition
| contains relays meters and computers |
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Term
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Definition
protects against hazards from people and provides ground source
is a critical element |
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Term
| Environmental Consideration |
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Definition
oil spill containment
humming sound
electro magnetic fields
all part of ______________ |
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Term
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Definition
has room for expansion
mobile substation |
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Term
assists in controlling how changes voltage from one level to another. controls flow of power by adjusting voltage and current |
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Definition
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Term
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Definition
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Term
| current/potential transformers |
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Definition
provide a reduction in voltage and current so power flow can be measured
Senses abnormal levels in current
Reduces current levels
Reduces voltages |
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Term
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Definition
| how long can it take to obtain right of way |
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