240 Electrical Power Systems Technology
Protective Relay
Fault Current
Bimetallic Overload Relay
Melting Alloy Overload Relay
Undervoltage Protection
Raceway
Feeder Circuit
Branch Circuit
Underground Distribution
Safety Switch
Panelboard
Low-Voltage Switchgear
Load Center
Service Entrances
Grounding Electrode
Ground
Service Entrance Conductors
Uninterruptible Power Supply
Power Line Filter
Power Conditioner
Floor-Mounted Raceway
Conduit Connectors
Wire Connectors
Plastic Conduit and Enclosures
Power Outlet Design
International Power Source
EQUIPMENT USED AT SUBSTATIONS
Substations are very important parts of the electrical power systems.
The link between the high-voltage transmission lines and the low-voltage
power distribution systems is the substation. The function of a distribu-
tion substation, such as the one shown in Figure 8-2, is to receive electrical
power from a high-voltage system and convert it to voltage levels suitable
for industrial, commercial, or residential use. The major functional com-
ponent of a substation is the transformer, whose basic characteristics were
discussed previously. However, there are many other types of specialized
equipment required for the operation of a substation.