ABB Relion 620 Series - Introduction

Section 1 Introduction
1.1 This manual
The operation manual contains instructions on how to operate the protection relay once it
has been commissioned. The manual provides instructions for monitoring, controlling
and setting the relay. The manual also describes how to identify disturbances and how to
view calculated and measured power grid data to determine the cause of a fault.
1.2 Intended audience
This manual addresses the operator who operates the protection relay frequently.
The operator must be trained in and have a basic knowledge of how to operate protection
equipment. The manual contains terms and expressions commonly used to describe this
kind of equipment.
1MAC456939-IB D Section 1
Introduction
620 series ANSI 7
Operation Manual