IEC TR 62510:2008 pdfダウンロード

IEC TR 62510:2008 pdfダウンロード Standardising the characteristics of electricity
1 Scope
This technical report outlines the way in which electricity is now described as a product. Particularly, in Europe and several other areas, for example Brazil and Argentina, as well as in some states in the United States of America.
It is, however, rather a unique product because of its intangible and transient nature.
Strictly, it is a product that exists only for an instant at a given point of delivery, comes into existence at the same instant at which it is being used and is replaced immediately by a new product with rather different characteristics. Its characteristics are different at each separate point of delivery. Moreover, it is a product whose quality depends not only on the elements that go into its production, but also in the way in which it is being used at any instant by the equipment of multiple users. Therefore, the quality control that is possible for more tangible and concrete products is not applicable in the case of electricity.
All that can be attempted is some control of the conditions under which it is produced, transmitted and distributed and those under which it is used. In particular, the capacity of utilisation equipment to impinge on the quality of electricity, including that delivered to other equipment, must be recognized. Electrical equipment has become increasingly complex in terms of the functions it fulfils and the way in which it interacts with other electrical equipment. Frequently, that interaction takes place through the medium of the electricity network, which is the common energy source for all the equipment.
It arises because the network, intended to be a common energy source, also provides a conducting path interlinking all equipment. In effect, the electromagnetic phenomena arising from the behaviour of utilisation equipment are superimposed on the other characteristics of the electricity supply, and become part of the product that is delivered to the system user. They are joined also by phenomena arising from atmospheric and other external events and from the intrinsic response of a large electricity system to such events.
2 The power quality phenomena Observation of normalized network impedance characteristics, such as proposed in IEC 60725 for 1 6 A and 75 A supplies, is essential so that electricity suppliers, distributors and system users can share the power quality responsibility.
NOTE Normalized network impedances are not always applicable in many countries, because the particular network configuration makes the power quality management easier and more reasonable by using other methods rather than normalized network impedances.
The degree of economic development has a great influence on the importance attached to the different elements of supply quality. At an earlier stage of development, the primary concerns are likely to be that electricity is actually available and, when available, that the voltage and frequency are within reasonable range of their nominal values for most of the time. When these are the primary concerns, such matters as voltage dips, transients, etc. are seen as having minor relevance.
With more advanced economic development, however, continuity, voltage and frequency, while remaining important, begin to be taken for granted, and the emphasis shifts to the set of phenomena encompassed by the modern term, “power quality”. These phenomena are briefly described below.