46Bc Broken Conductor Detection; Overview Of Functions; Structure Of The Function - Siemens 7SR51 Device Manual

Protection and Automation Functions

5.8 46BC Broken Conductor Detection

5.8 46BC Broken Conductor Detection

Overview of Functions

5.8.1
The Broken Conductor Detection function is used to:
•
Detect open circuit primary conductors on 1 or 2 phases
•
Provide an alarm for indication purposes

Structure of the Function

5.8.2
The broken conductor detection function element has group dependent settings. These settings can be
different in each settings group – group numbers (Gn) 1 to 4.
This function corresponds to the logical node A46BCPTOC* in IEC 61850.
The function monitors the primary system using the 3 phase current inputs e.g. CT1/2/3. The fundamental
frequency component is measured from processing of the measured current samples.
The broken conductor in a 3 phase system is detected by a high the ratio of the negative phase sequence
(NPS) current level to positive phase sequence (PPS) current level
190 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019