IEEE C62.48-2005 pdf free.IEEE Guide on Interactions Between Power System Disturbances and Surge Protective Devices.
Abstract: Information is provided to users and manufacturers of surge-protective devices (SPDs) about the interactions that can occur between SPDs and power system disturbances. This guide applies to SPDs manufactured to be connected to 50 Hz or 60 Hz ac power circuits rated at 1 00—i 000 V rms. The effects of the presence and operation of SPDs on the quality of power available to the connected loads are described. The interaction between multiple SPDs on the same circuit is also described.
Keywords: harmonics, noise, power system disturbance, surge-protective device (SPD), swell, voltage sag, voltage surge
The purpose of this guide is to provide users and manufacturers of surge-protective devices (SPDs) with an understanding of the nature of power system disturbances and SPDs, and of the interactions that can occur between them and between SPDs. Given this understanding. users will be able to take steps to either prevent or mitigate adverse effects of such interactions.
The growth of interest in low-voltage SPDs parallels the increasing number of applications of highly sophisticated electronic equipment that can be exposed and susceptible to surge voltages. Users of SPDs can sometimes be under the impression. or can be led to believe, that by installing an SPD in their facility or within their equipment, they will provide total immunity to any and all power system disturbances. In reality. SPDs will respond to and affect some power system disturbances. The effects that SPDs will have on power system disturbances are often less than desired. SPDs installed at various locations in the wiring systems as well as in equipment can interact with those wiring systems and with each other. In this scenario, the effect of any given SPD is imprecise and predictable only within wide limits. Proper application of SPDs will eliminate or reduce the effects of these disturbances for which it was designed. The use of SPDs is covered in other IEEE C62 family documents.
The SPDs discussed herein are intended to limit transient overvoltages that can appear in low-voltage ac power systems having service voltages of 1000 V or less.
This guide applies to surge-protective devices (SPDs) manufactured to be connected to 50 Hz or 60 Hz ac power circuits rated at l00 1000 V rms.
IEEE C62.48 describes the effects on SPDs of power system disturbances occurring in these low-voltage ac power circuits. The disturbances are not limited to surges. The effects of the presence and operation of SPDs on the quality of power available to the connected loads are described. The interaction among multiple SPDs on the same circuit is also described.
This guide discusses both voltage and current surges. The current surges discussed in this guide are the result of voltage surges. Current surges that arc solely the result of load changes and do not result in voltage increases, such as a short circuit, arc not discussed in this guide.
An SPD’s primary purpose is to provide surge protection. Devices discussed in this guide contain at least one nonlinear component for diverting surge current and/or dissipating surge energy. such as a metal oxide varistor (MOV). silicon avalanche diode (SAD), thyristor, or spark gap. Uninterruptible power supplies (UPSs), ferroresonators. motor-generators. and filters containing only inductive and/or capacitive components are not considered SPDs in this guide.IEEE C62.48 pdf download.