The single-line diagram may be used in a
number of important ways in operating and maintaining an industrial or
commercial power distribution system. Frequently, the single-line diagram, with
all of the listed information, becomes too crowded for information to be used
effectively in some of the operating activities.
In those instances, it is wise to produce a
set of single-line diagrams, with each different diagram in the set containing
the pertinent information that is required for a particular activity or set of
activities. Some of the needs for special single-line diagrams are
a) Switching functions. When the
primary use of the diagram is to provide information to system operators for
switching in order to isolate portions for maintenance or for load control,
then only the data required to make the decisions necessary for system
switching are included on the diagram.
Sometimes, when the distribution system is
complex, a separate version of the single-line diagram in block form is more
usable than a complete single-line diagram. This may be identified as a system
operating diagram.
b) Load flow control. This diagram
is used exclusively for load flow control. It only includes the data that show
system component capacities and other data that pertain to load flow.
c) Relaying and relay logic diagrams.
These single-line diagrams are used to describe the system protective relay
systems. These diagrams are used particularly as logic and tripping diagrams
that may contain a unique language used only to depict the sequence of relay or
system protective component operation under various fault conditions.
No comments:
Post a Comment