Purpose and scope
This bulletin covers rural transmission and distribution with air-insulated, outdoor substations 345 kV (phase-to-phase) and below. Possible design responsibilities of the engineer are covered, including preparation of construction drawings, material, equipment and labor specifications, and any other engineering design services that may be required.
Relationship of substation to overall power system
A substation is part of a system and not an entity to itself. Normally, a power system is designed so that the effects of an outage (caused by the failure of a single component such as a transformer, transmission line, or distribution line) will result in minimal interruption of service and affect the fewest customers possible.
Failure of one component in a system often forces a greater than normal load to be carried by other components of the system. Such contingencies are normally planned for and incorporated into design criteria.
Importance of adequate substation planning and engineering
Substation planning considers the location, size, voltage, sources, loads, and ultimate function of a substation.
The engineer’s detailed work requires use of valid requirements and criteria, appropriate guidelines, and engineer’s own expertise in order to provide construction drawings and associated documents appropriate for needed system improvements.
The engineer’s ability to meld the diverse constraints into an acceptable design is essential.
|Title:||Design Guide for Rural Substations – United States Department of Agriculture – Rural Utilities Service|
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