Characteristics - Siemens SIPROTEC 4 User Manual

1.3

Characteristics

General Characteristics
•
Powerful 32-bit microprocessor system
•
Complete digital processing and control of measured values, from the sampling of the analog input quan-
tities to the initiation of outputs, for example, tripping or closing circuit breakers or other switchgear
devices
•
Total electrical separation between the internal processing stages of the device and the external trans-
former, control, and DC supply circuits of the system because of the design of the binary inputs, outputs,
and the DC or AC converters
•
Complete set of functions necessary for the proper protection of lines, feeders, motors, and busbars
•
Easy device operation through an integrated operator panel or by means of a connected personal
computer running DIGSI
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Continuous calculation and display of measured and metered values on the front of the device
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Storage of min./max. measured values (slave pointer function) and storage of long-term mean values
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Recording of event and fault data for the last 8 system faults (fault in a network) with real-time informa-
tion as well as instantaneous values for fault recording for a maximum time range of 20 s
•
Constant monitoring of the measured quantities, as well as continuous self-diagnostics covering the
hardware and software
•
Communication with SCADA or substation controller equipment via serial interfaces through the choice
of data cable, modem, or optical fibers
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Battery-buffered clock that can be synchronized with an IRIG-B (via satellite) or DCF77 signal, binary input
signal, or system interface command
•
Motor Statistics: Recording of important statistical motor data (operation and startup information)
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Switching statistics: Counting the number of trip commands initiated by the device, logging the currents
of the last switch-off operation initiated by the device, and accumulating the eliminated short-circuit
currents of each breaker pole
•
Operating hours counter: Counting the operating hours of the protected object under load
•
Commissioning aids such as connection check, direction determination, status indication of all binary
inputs and outputs, easy check of system interface and influencing of information of the system interface
during test operation
Time Overcurrent Protection 50, 51, 50N, 51N
•
Three definite time overcurrent protective elements and one inverse time overcurrent protective element
for phase current and ground current Ι
•
Two-phase operation of the overcurrent protection (Ι
•
Different curves of common standards are available for 51 and 51N, or a user-defined characteristic
•
Blocking is possible, e.g. for reverse interlocking with any element
•
Instantaneous tripping by any element is possible when switching onto a fault
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In-rush restraint with second harmonic current quantities.
Ground Fault Protection 50N, 51N
•
Three definite time overcurrent protective elements and one inverse time overcurrent protective element
applicable for grounded or high-resistance grounded systems
•
Different Curves of common standards are available for 51 and 51N, or a user-definedcharacteristic
SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016
or summation current 3Ι
N 0
, Ι ) is possible
A C
Introduction
1.3 Characteristics
25