1.1 Overall Operation
19
7SA522 Manual
C53000-G1176-C155-3
Figure 1-1 Hardware structure of the digital Distance Protection 7SA522
A voltage measuring input is provided for each phase-earth voltage. A further voltage
input (U
4
) may optionally be used to measure either the displacement voltage (e-n volt-
age), for a busbar voltage (for synchronism and voltage check) or any other voltage
U
X
(for overvoltage protection). The analog values are transferred further to the IA
input amplifier group.
The input amplifier group IA provides high-resistance termination for the analog input
quantities. It consists of filters that are optimized for measured value processing with
regard to bandwidth and processing speed.
The AD analog digital converter group contains analog/digital converters and memory
components for data transfer to the microcomputer system.
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