Current-Unbalance Protection for Capacitors, 3-Phase
Overview of Functions
The Current-unbalance protection for capacitors, 3-phase function (ANSI 60C):
•
Protects in case of capacitor elements (C-elements) faults of a capacitor bank in H connection
•
Provides very sensitive supervision of the unbalanced current between the 2-star points
•
Allows counting of individual faulty C-elements
Structure of the Function
The Current-unbalance protection for capacitors, 3-phase function is used in the Capacitor bank function
group. It is preconfigured at the factory with 2 overcurrent-protection stages I> and one stage of the type
Counter. A maximum of 3 overcurrent-protection stages and 4 counter stages can be operated simultaneously
in the function.
The function is designed so that the General functionality (including compensation) and the Measuring-
point selection can work across the stages.
[dwocpIunbalanced-300813, 4, en_US]
Figure 7-7 Structure/Embedding of the Function
General Functions and Measuring-Point Selection
Description
The General functionality is structured in the following functional parts:
•
Compensation of the unbalance
•
Normalization of the unbalanced current with the current I
c
•
Counting faulty C-elements (the stage type Counter is used to monitor the counter status)
7.4
7.4.1
7.4.2
7.4.3
7.4.3.1
Capacitor Bank Protection
7.4 Current-Unbalance Protection for Capacitors, 3-Phase
SIPROTEC 5, Overcurrent Protection, Manual 977
C53000-G5040-C017-8, Edition 07.2017
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