Siemens 6MD86 - Directional Overcurrent Protection, Phases; Overview of Functions; Structure of the Function; Stage Control

Directional Overcurrent Protection, Phases
Overview of Functions
The Directional overcurrent protection, phases function (ANSI 67):
•
Detects short circuits at electrical equipment
•
Can be used as backup or emergency overcurrent protection in addition to the main protection
•
Ensures selective fault detection for parallel lines or transformers with infeed at one end
•
Ensures selective fault detection in cable runs with infeed at both ends or in lines connected to form ring
topologies
Structure of the Function
Stage Control
Description
Logic
The following figure represents the stage control. It applies to all types of stages.
[lodocp32-190111-01.tif, 1, en_US]
Figure 7-90
Stage-Control Logic Diagram
7.6
7.6.1
7.6.2
7.6.3
7.6.3.1
Protection and Automation Functions
7.6 Directional Overcurrent Protection, Phases
SIPROTEC 5, High-Voltage Bay Controller, Manual 667
C53000-G5040-C015-9, Edition 11.2017