Full Description

Scope

This standard specifies the procedures t o be used in the seismic testing of relays used in power system facilities. The standard is concerned with the determination of the seismic fragility level of relays and also gives recommendations for proof testing.

Purpose

The purpose of this standard is to establish procedures for determining the seismic capabilities of protective and auxiliary relays. These procedures employ what has been called fragility testing in ANSI/IEEE Std 344-1975, Recommended Practices for Seismic Qualification of Class IE Equipment for Nuclear Power Generating Stations. In order to define the conditions for fragility testing of relays, parameters in three separate areas must be specified. In general they are:(l) The electrical settings and inputs to the relay, and other information to define its conditions during the test.(2) The change in state, deviation in operating characteristics or tolerances, or other change of performance of the relay which constitutes failure.(3) The seismic vibration environment to be imposed during the test.

Abstract

- Superseded.This is a standard for developing data related to the seismic capabilities of relays. This standardcompliments ANSI/IEEE Std 344-1975, Recommended Practices for Seismic Qualification of Class IE Equipment for Nuclear Power Generating Stations, which provides general guidelines for developingdata related to seismic qualification of equipment used in nuclear generating plants.Data must be developed by testing rather than analytical means since protective relays fall intothe category of complex devices as described in Section 5 of ANSI/IEEE Std 344-1975; however, analysis may be used in data reduction, in reconciling response spectra, in justifying methods of evaluating changes, and in justifying seismic qualifications of relays of similar construction.While aging is recognized as a potential influence on the seismic capability of relays, insufficientdefinition presently exists to permit realistic simulation of end-of-life for various relays. When applicabledefinition of the various degrading factors and methods of accelerating the effect of thesefactors is developed in other related standards, they should be considered in the previbration preparation.It should be emphasized that while a primary purpose in preparing this standard was to cover theapplication of relays to nuclear generating plants, the standard is not restricted to this application.This standard may be applied to any area in which the seismic response of relays is a design consideration.

Product Details

Published: 04/28/1978 ISBN(s): 9781504403702 Number of Pages: 20File Size: 1 file , 23 MB Product Code(s): STDSU07161