Siemens 7SJ85 - Peak Overvoltage Protection for Capacitors; Overview of Functions; Structure of the Function

Peak Overvoltage Protection for Capacitors
Overview of Functions
The Peak overvoltage protection for capacitors (ANSI 59C) function protects capacitors against:
•
Peak overvoltages that stress the dielectric medium in the capacitor causing accelerated aging
•
Peak overvoltages that in extreme cases can destroy the dielectric medium in the capacitor
Structure of the Function
The Peak overvoltage protection for capacitors function can be applied in the Capacitor bank function
group.
3 types of stages are available:
•
Stage with inverse-time characteristic curve according to IEC and IEEE Standards
•
Stage with definite-time characteristic curve
•
Stage with user-defined characteristic curve
The function is preconfigured at the factory with a stage having an inverse-time characteristic curve and a
stage having a definite-time characteristic curve.
Within the function, the following maximum number of stages can be operated simultaneously:
•
1 stage with an inverse-time characteristic curve
•
4 stages with a definite-time characteristic curve
•
1 stage with a user-defined characteristic curve
[dw_strpea-230813, 3, en_US]
Figure 7-30 Structure/Embedding of the Function
7.6
7.6.1
7.6.2
Capacitor Bank Protection
7.6 Peak Overvoltage Protection for Capacitors
1020 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017