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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 quanti-
ties 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 transformer,
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
• Storing fault indications for the last 8 power system faults (faults in the power system) with real-time assign-
ment and instantaneous values for fault recording for a maximum time period of approx. 18 s
• Constant monitoring of the measured quantities, as well as continuous self-diagnostics covering the hard-
ware 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
• Motor statistics: Recording of the operational information and startup information such as the total number
of motor starts, motor operating hours, percentage of motor operating time, total megawatt hours, and the
startup information duration and currents for each motor startup
• 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 out-
puts, 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 I
• Two-phase operation of the overcurrent protection (I
• For inverse-time overcurrent protection, selection from various characteristics of different standards possi-
ble
• 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.
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
or summation current 3I
N
, I
) is possible
A
C
0
Introduction
1.3 Characteristics
23
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