IEEE C37.37-1996 pdf download IEEE Loading Guide for AC High-Voltage Air Switches (in Excess of 1000 V)
1.1 Scope
This loading guide applies to ac high-voltage air switches in excess of 1000 V rated in accordance with IEEE StdC37.30-1992.’ This standard does not apply to switches used in enclosures covered by IEEE Std C37.20.2-1993, IEEEStd C37.20.3-1996.IEEE Std C37.23-1987,IEEE Std C37.71-1984, and ANSI C37.72-1987. Moreover, interrupterswitches covered by IEEEP C37.39 are excluded from the scope of this standard. If an air switch is equipped with aload-break device or interrupter, it may not successfully interrupt currents above the nameplate rating.
1.2 Purpose
The purpose of this guide is to aid users and manufacturers in the deterimination of
a)The allowable continuous current class (ACCC)designations.
b)The continuous load current capabilities of air switches under various conditions of ambient temperature
c)The emergency load current capabilities of air switches under various conditions of ambient temperature.
2.References
This recommended practice shall be used in conjunction with the following publications:
Accredited Standards Committee C2-1997, National Electrical Safety Code (NESCO) (ANSI).’
ANSI C29.1-1988, Test Methods for Electrical Power Insulators.
3. Definitions
The definitions of terms contained in this document, or in other standards referred to in this document, are not intendedto embrace all legitimate meanings of the terms. They are applicable only to the subject treated in this standard. Foradditional definitions, see IEEE Std C37.100-1992. An asterisk () following the definition indicates tha, at the timethis standard was approved, there was no corresponding definition in IEEE Std C37.100-1992.
3.1 allowable continuous current class (ACCC) designation (of an air switch): A code that identifies the compositecurve relating the loadability factor (LF) of the switch to the ambient temperature 0, as delermined by the limiting
switch part class designations.*3.2 loadability: The allowable continuous current capability of an air switch at a given ambient temperature.3.3 loadability factor (of an air switch): The ratio of allowable continuous current at a given ambient temperature torated current?
3.4 switch part class designation: A code that identifies the curve that relates the loadability factor (LF) of a switchpart material and function to the ambient temperature O..
4. General application conditions
Air switches are designed for normal application in accordance with IEEE Std C37.30-1992 where the sustained loadcurrent does not exceed the rated continuous current. the altitude above sea level is 3300 ft (1000 m) or less. and theambient temperature does not exceed 40 °C. The rated continuous current is based on the limits of observablecurrent from table 3 of IEEE Std C37.30-1992, reprinted herein as table 1.temperature rise at rated continuous
IEEE C37.37-1996 pdf download
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