Features; Functions - Siemens SIPROTEC 7SS522 V4.6 Manual

The overcurrent-time protection is a back-up protection function of the bay unit and in-
cludes the following functions (see Chapter 5.16, page 188):
• Phase-selective high-set stage (I>>)
• High-set stage for the earth current (IE>>)
• Phase-selective overcurrent stage with definite time or inverse time characteristic
• Overcurrent stage for the earth current with definite time or inverse time character-
Back-up protection function, can work without the central unit
Separate circuit breaker failure protection
1.3

Features

• Powerful multiprocessor system
• Completely digital measured value processing and control, from the acquisition and
• Graphical station planning with the DIGSI communication software
• Easy station configuration with the DIGSI communication software
• Easy centralized operation of bay units from the central unit using DIGSI, or local
• Battery-buffered storage of fault events as well as instantaneous values for fault re-
• Complete galvanic and disturbance-free isolation between the internal processing
• Disturbance-free and fast data transmission from and to the bay units by fiber-optic
• Complete scope of functions for the selective protection of multiple busbar systems
• Central administration of the isolator states
• Continuous monitoring of measured values as well as of hardware and software of
• Comprehensive self-monitoring provides for fast signaling of unit failures
• Communication via electrical or optical interfaces and use of the DIGSI communi-
• Communication check via Web browser
• IEC 61850
• Control center link of the central unit as per IEC 60870-5-103 and IEC 61850
7SS52 V4 Manual
C53000-G1176-C182-3
(I> / Ip)
istic (IE> / IEp)
digitizing of measured values, recognition of the isolator status and processing of
the CB failure protection signals up to the trip decisions for the circuit-breaker
menu-guided operation via integrated keypad and display panel
cording
circuits of central unit and bay units and the measuring and auxiliary supply circuits
of the station by virtue of screened measuring transducers, binary input and output
modules and DC converters
links
the unit
cation software for planning, parameterization and for indication and fault record
analysis
Features
5