IEEE P3006.2-D5-2015 pdf free.Draft Recommended Practice for Evaluating the Reliability of Existing Industrial and Commercial Power Systems.
This recommended practice describes how to evaluate the reliability of existing industrial and commercial power systems. It is likely to be of greatest value to the power-oriented engineer with limited experience in the area of reliability. It can also be an aid to all engineers responsible for the design of industrial and commercial power systems.
The following referenced documents are indispensable for the application of this document (i.e.. they must be undcrsood and used, so each rekrcnced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
Traditionally, efforts to improve the reliability of electrical service within an industrial or commercial facility with critical power rcquircmcnts have focused on increasing the reliability of the electric utility supply. Facility engineers may be unable to improve the reliability of their utility supply, such improvement may be very costly, and will have no impact on outages resulting from internal failures. . As a result, they must also focus (heir attention on critical areas within their own system. A logical approach to the analysis of options available in the electrical system (in terms of both utility supply and facility distribution) will lead to the greatest reliability improvement for the least cost. In many instances, reliability improvements can be obtained without any capital cost by making the proper inquiries.
A thorough and properly integrated investigation of the entire electric system will pinpoint the components or subsystems having unacceptable reliability. Some important general inquiries follow. Many of these questions apply o the utility and the industrial or commercial facility distribution systems.
a) How is the system operated under normal and contingency conditions?
b) What is the age and physical condition of the electric system components?
C) What are the eflicts of faults that occur at different points in the system on the critical loads?
d) What is the probability of failure and its expected duration for each of the components or subsystems of the system?
c) Arc critical loads (those necessary to sustain the mission of the facility) segregated from noncritical loads?
f) Are there hazards other than mission impact. such as fire or life safety hazards, associated with interruption of power?
g) What duration of power interruption will impact the mission of the facility and what is the cost of that impact? (That is. will momentary or short-duration interruptions cost production dollars or merely be an inconvenience?)
h) What power quality criteria must the electrical systcm meet to support the facility mission?
i) Are the proper operations and maintenance policies and procedures in place to support achieving the designed-in reliability of the system?
The answers to these and similar questions, if properly acted upon, can and will result in an improvement in reliability and availability.IEEE P3006.2-D5 pdf download.