FACTORS AFFECTING DRY TYPE TRANSFORMER'S LIFE BASICS AND TUTORIALS


DRY TYPE TRANSFOMER FACTOR THAT AFFECT ITS LIFE BASIC INFORMATION
What Are The Factors That Affects The Life OF Dry Type Transformers?

Dry-type transformers may be loaded above rated kilovolt-amperes under conditions other than those specified in the preceding clauses, with a sacrifice of life expectancy dependent on the load capability of the transformer and on the actual operating conditions.

The overload capability of dry-type transformers varies widely and is affected by the following characteristics:

a) Hottest-spot winding conductor rise over ambient;
b) Ratio of load losses to no-load losses;
c) Time constant;
d) Ambient temperature.

Operating conditions for dry-type transformers are so variable that no single set of practical loading data can be presented for all possible combinations of conditions and loading.

However, methods are outlined in this clause whereby the user can estimate allowable loads for the user’s own conditions by taking into account the probable number and nature of such loads during the life of the transformer, and the approximate percentage of life expectancy that the user is willing to sacrifice.

In general, permissible temperatures and loads calculated by the means outlined here will be higher than those loading for life expectancy which are necessarily conservative in order to cover the wide variation in sizes and makes of dry-type transformers.

The necessary curves, tables, equations, and definitions used as a basis for the methods given here are presented in Clause 6 of IEEE STD-C57.56. Information given is considered to be the best that can be produced from the present knowledge of the subject.

In spite of its approximate nature, it is believed that it will be of value as a guide to the user.

No comments:

Post a Comment

Related Posts Plugin for WordPress, Blogger...

TOP COUNTRIES