Analysis and Design of Electrical Power Systems

8Short‐Circuit Currents

8.1 Introduction

In addition to load flow calculations, short‐circuit current calculations are among the basic investigations in the planning of a three‐phase network. Short‐circuit current calculation examines the following network planning parameters:

• Determination of the dynamic and thermal stress of the equipment
• Design and adjustment of the mains protection
• Calculation of the required opening and breaking capacity of the circuit‐breakers
• Assessment of the type of neutral point treatment
• Check of the permissible grounding and contact voltages

Short‐circuit current calculations, i.e. the calculation of short‐circuit currents and their effects, are incorporated in various parts of the standards DIN EN 60909‐0 (IEC ...