IEEE C62.48-1995 pdf download IEEE Guide on Interactions Between Power System Disturbances and Surge-Protective Devices
1. Overview
1.1 Scope
This guide applies to surge-protective devices (SPDs) manufactured to be connected to 50 or 60 Hz ac powercircuits rated at 100-1000 V rms.
This guide describes the effects on SPDs of power system disturbances occurring in these low-voltage acpower circuits. The disturbances are not limited to surges. The effects and side effects of the presence andoperation of SPDs on the quality of power available to the connected loads are described. The interactionbetween multiple SPDs on the same circuit is also described.
This guide will discuss both voltage and current surges. The current surges discussed in this guide are theresult of yoltage surges. Current surges that are solely the result of load changes and do not result in voltagcincreases, such as a short circuit, are not discussed in this guide.
An SPD is a device whose primary purpose is to provide surge protection. Devices discussed in this guidecontain at least one nonlinear component for diverting surge current and/or dissipating surge energy, such asa metal oxide varistor (MOV). silicon avalanche diode (SAD), thyristor, or spark gap. Uninterruptible powelsupplies, ferroresonators, motor-generators, and filters containing only inductive and/or capacitive compo-nents are not considered SPDs in this guide.
1.2 Purpose
The purpose of this document s to provide information on the interactions between power system disturbances and SPDs that is not readily available in other standards. This document provides summary information on power system disturbances that affect or may affect SPDs The description of the interactions isintended to educate the potential user of such SPDs as to what he or she can expect from such devices.
2. References
References contain informaion that is implicitly adopted in the present document; complete comprehensionof the interactions described in this guide shall require the reader to consult those sources for the details of aparticular subject. They are cited in the text by their standards organization designation.
ANSI C84.1-1989,American National Standard Voltage Ratings for Electric Power Systems and Equipment(60 Hz).
ANSI/NFPA 70-1993,National Electrical Code.
IEEE Std C62.41-1991, IEEE Recommended Practice on Surge Votages in Low-Voltage AC Power Circuits(ANSI.3
3. Definitions
The purpose of this clause is to define those terms that will aid in the understanding of the concepts in thisguide. Where possible, definitions were obtained from IEEE Std 100-1992 (B3]: these are identified by anasterisk (*). The second choice was to obtain them from other appropriate sources. The final choice was tocreate a new definition that conveys a common understanding for the word as used in the context of thisguide.
3.1 combination-type SPD: An SPD that incorporates both voltage-switching-type components and volt-age-limiting-type components that may exhibit voltage switching, voltage limiting, or both voltage-switch-ing and voltage-limiting behavior, depending upon the characteristics of the applied voltage.
3.2 commercial power: Electrical power furnished by the electric power utility company.*
3.3 harmonic: A sinusoidal component of a periodic wave having a frequency that is an integral multiple ofthe fundamental frequency.*
3.4 harmonic distortion: The mathematical representation of the distortion of the pure sine waveform.
3.5 mains: The ac power source available at the point of use in a facility, lt consists of the set of electricalconductors (referred to by terms including service entrance, feeder, or branch circuit) for delivering powerto connected loads at the utilization voltage level.*
IEEE C62.48-1995 pdf download
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