DIN EN 60870-2-1:1997-07

Introduction
1 Scope and object
2 Normative references
3 Definitions
4 Power supply
4.1 General
4.2 AC supply
4.2.1 AC voltage tolerances
4.2.2 Frequency tolerances
4.2.3 Harmonic content
4.3 DC supply
4.3.1 DC voltage tolerances
4.3.2 Earthing arrangements for d.c. supply
4.3.3 Voltage ripple of the d.c. supply
5 Electromagnetic compatibility
5.1 General
5.2 Immunity tests
5.3 Acceptance criteria for immunity tests
5.4 Emission tests
5.5 Protection techniques and installation guidelines
6 Insulation withstand voltages
Annex
ZA (normative) Normative references to international
       publications with their corresponding European
       publications

Describes telecontrol equipment and systems with coded bit serial data transmission for monitoring and control of geographically widespread processes. In addition it is a reference document for teleprotection equipment and systems and equipment included in a distribution line carrier (DLC) system supporting a distribution automation system (DAS)