Read e-book online Aging power delivery infrastructures PDF

By Willis, H. Lee; Schrieber, Randall R

ISBN-10: 1439804036

ISBN-13: 9781439804032

ISBN-10: 1439896917

ISBN-13: 9781439896914

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These and other similar problems impact an area of the system with obsolete system layout or an area of the system operating at high utilization ratios, far more than they impact a traditional (66% – 70% utilization) power system. , and limitations in its full equipment usage due to such partial failures add stress and often “uses up” contingency capability. A power transformer loaded to 85% at peak, whose tap changer is locked into one position, is subject to voltage regulation problems that can easily reduce its ability to handle load by more than 15%.

Symptoms of the obsolete system layout The net result of obsolete infrastructure is that higher loading levels have three undesirable consequences: 2a. Accelerated aging. Time to failure for most electrical equipment is often to a large degree a function of its loading. The higher utilization rates forced on utilities in these areas of the system cause electrical equipment there, particularly cables and transformers, to “age” or deteriorate faster and fail sooner. Thus, in those areas where age and failure rate is already a serious concern, the obsolete system layout forces the utility to exacerbate those problems just to get by.

As a result, the solution to this particular problem source is a combination of partial measures that seek only to reduce failure rate slightly and control its effects: a) Careful assessment and tracking of condition, b) Good utilization of capacity and expected reliability of equipment, c) Artful management of restoration and replacement policies, d) Design of the system for failure – planning that assumes that things will go wrong. Chapters 10 and 11 will discuss these in more detail. Contributing Factor 2: Obsolete System Layouts This, not aging equipment per se, is perhaps the strongest contributor to poor reliability in a sizeable portion of aging infrastructure cases.

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Aging power delivery infrastructures by Willis, H. Lee; Schrieber, Randall R


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