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devices confines the outage to the smallest number of customers possible This can be achieved by coordinating all the fuses and reclosers on the primary feeder main In block diagram Fig 43, distribution substation voltage is 1247 kV line-to-line and 72 kV line-to-neutral (this is conventionally written as 12,470Y/7200 V) However, the trend is toward higher primary four-wire distribution voltages in the 25to 35-kV range Single-phase feeders such as those serving residential areas are connected line-to-neutral on the four-wire systems The use of underground primary feeders that are radial three-conductor cables is increasing They are serving urban areas where load demand is heavy, particularly during the hot summer months, and newer suburban residential developments Both cost factors and the importance of reliability to the customers being served influence the design of primary systems The simplest and least expensive (as well as least reliable) configuration is the radial distribution system shown in Fig 4-4a, because it depends on a single power source Despite their lower reliability, radial systems remain the most economical and widely used distribution systems for serving homes because an electrical power outage there is less likely to have serious economic or public safety consequences As a hedge against outages, most utilities plan their distribution systems so that they will have backup if those events occur The goal of
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Figure 4-4 Simplified diagrams of the basic electrical distribution systems: (a) radial and (b) loop
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all electrical distribution systems is the economic and safe delivery of adequate electric power to serve the electrical loads The reliability of the primary feeder can be improved with the installation of a loop distribution system, as shown in Fig 4-4b In loop systems the feeder, which originates at one bulk power source, loops through the service area and several substations before terminating at the original substation or another bulk source The strategic placement of switches at the substations permits the electric utility to supply customers in either direction If one power source fails, switches are opened or closed to bring an alternative power source online Loop systems provide better service continuity than radial systems, with only short service interruptions during switching However, they are more expensive than radial systems because of the additional switching equipment requirements As a result, loop systems are usually built to serve commercial and light industrial buildings and shopping malls, where power outages are more likely to endanger human lives or result in property losses Reliability and service quality can be significantly improved at even higher cost with a multiple parallel circuit pattern In these systems, two or more circuits are tapped at each substation The circuits can be radial or they can terminate in a second bulk power source These interconnections permit each circuit to be supplied by many different substations
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Secondary Distribution Systems
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The secondary distribution system is that part of the electrical power system between the primary system and the customer s service entrance This system includes distribution transformers, secondary circuits (secondary mains), customer services (consumer drops), and watthour meters to measure customer power consumption Secondary voltages are provided by distribution transformers that are connected to the primary system and sized for the voltages required for specific parts of the service area Heavy industries or mines, which require the most power, are usually supplied with three-phase power by privately owned or corporate industrial substations They are typically located on land owned by those companies and close to the equipment being served These substations are capable of providing a wide range of voltages from the 1247- to 138-kV transformers located there Factories, high-rise buildings, shopping centers, and other large power consumers are furnished with three-phase power from load substations in the 480-V to 416-kV range Many commercial and light industrial customers are supplied by 208Y/120-V or 480Y/277-V three-phase, four-wire systems The most reliable service in densely populated urban business and commercial areas is provided by grid-type secondary systems at 208Y/120 V or by spot networks, usually at 480Y/277 V Spot networks are usually located in urban areas near high-rise office buildings, factories, hospitals, and dense commercial properties such as shopping malls, which have high load densities In these networks the transformers and their protective equipment are typically placed adjacent to or within the properties being served
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