Guia metodologica para los ensayos según ANSI 87L para Relé SIEMENS 7SL87

Abstract

The Differential Line test depends on the installation of measuring instruments (CTs) and the protection device at each end of the line to be protected, these devices exchange the measured values ​​through communication links and operate on the basis of A comparison they make permanently by tripping the assigned switch in the event of a short circuit in its protection range, which is selectively delimited with the installed current transformers. The realization of this methodological guide is of great help for the processes in the testing field of the SIEMENS SA panel factory. Since it helps to standardize in an orderly way and practices the performance of protection tests and makes it easier for the engineer to perform them, getting familiar with the devices used in a fast and safe way.