ANSI/IEEE C57.95-1984 pdf free download. IEEE Guide for Loading Liquid-Immersed Step-Voltage and Induction-Voltage Regulators.
1.1 Scope
1.1.1 ANSI/IEEE C57.95-1984 covers general recommendations for loading mineral oil-immersed, 55 C rise, step-voltage and induction-voltage regulators manufactured in accordance with ANSI/
IEEE C57.15-1986.
Some users may choose to load regulators as though rated for 65 C rise, although this operation is not recognized by ANSI/IEEE C57.15- 1986 [2]. This guide treats the loss of life to be anticipated under such operation.
1.1.2 Loading recommendations in tabular form are contained in Section 4 of this guide. These recommendations cover a wide range of ambient conditions and loss of life.
1.1.3 The method and equations used for calculation of the tables are given in Section 5 of this guide.
2 General
2.1 Rated kVA
2.1.1 The term rated kVA or rated output of a voltage regulator used in this guide refers to the nameplate rating.
2.1.2 The temperature rise on which the rated output of a regulator is based takes into consideration the experience of the industry regarding.
(1) Insulation life as affected by its operating temperature.
(2) The ambient temperature assumed to exist throughout the Life of the regulator.
2.1.3 The actual output that can be delivered at any time in service without excessive deterioration of the insulation may be more or less than the nameplate kVA rating, depending upon the ambient condition and other attendant om erating conditions.
Regulators may be applied at higher ambient temperatures or at higher altitudes than specified in ANSI/IEEE C57.15-1986 [2], but performance may be affected and special consideration should be given these applications.
2.2 Limitations
2.2.1 It should be recognized that there may be limitations in the loads above ratings that a regulator may carry, other than the capacity of the windings and cooling system. Among these limitations are oil expansion, bushings, leads, tap switches, the thermal capability of cables, connectors, reactors, current transformers, and the voltage drop compensator circuits. Other considerations may be additional contact maintenance and deterioration of gaskets. Any of these items may limit the loading, and manufacturers should be consulted for advice on such limitations.ANSI/IEEE C57.95-1984 pdf download.