Characteristics - Siemens SIPROTEC 4 Manual

Introduction

1.3 Characteristics

1.3 Characteristics
General Characteristics
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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
•
Continuous calculation and display of measured and metered values on the front of the device
•
Storage of min./max. measured values (slave pointer function) and storage of long-term mean values
•
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
•
Battery-buffered clock which can be synchronized via a synchronization signal at the binary input or via a
protocol
•
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 and direction check, status indication of all binary inputs and
outputs, easy testing of port B, and influencing of information at port B 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
•
For inverse-time overcurrent protection, selection from various characteristics of different standards
possible
•
Blocking is possible, e.g. for reverse interlocking with any element
•
Instantaneous tripping by any element is possible when switching onto a fault
•
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
•
For inverse-time overcurrent protection, selection from various characteristics of different standards
24
or summation current 3Ι
N 0
, Ι ) is possible
A C
SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017