Characteristics - Siemens SIPROTEC 7SC80 Series Manual

Introduction

1.3 Characteristics

1.3 Characteristics
General Properties
• Powerful 32-bit microprocessor system
• Complete digital measured value processing and control, from sampling and digitalization of the measured
quantities to close and trip decisions for the switchgear component
• Complete galvanic and interference-free isolation of the internal processing circuits of the measurement,
control and supply circuits of the system using instrument transformers, binary input and output modules,
and DC and AC voltage converters.
• Complete functional scope required for protection and control of a line section
• Easy device operation using the Web Monitor or a connected PC running DIGSI
• Continuous calculation and displaying of measured values and count values
• 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
• Continuous monitoring of the measured quantities and of the device hardware and software
• Communication with central control and data storage equipment
• Battery-buffered clock which can be synchronized via a synchronization signal at the binary input, or via a
protocol or GPS
• 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 out-
puts, easy testing of port F, and influencing of information at port F during test operation.
Non-directional Overcurrent Protection
• Three definite-time overcurrent protection elements each for phase currents and ground current I
mation current 3I
• Two-phase operation of the overcurrent protection (I
• 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.
Directional Overcurrent Protection
• Two definite-time overcurrent protection elements for the phase operate in parallel to the non-directional
overcurrent elements. Their pickup values and time delays can be set independently of these.
• Direction determination with cross-polarized voltages and voltage memory and dynamically unlimited direc-
tion sensitivity
• Fault direction is calculated phase-selectively and separately for phase faults, ground faults and summation
current faults.
20
0
, I ) is possible.
A C
E50417-G1140-C486-A1, Release date 12.2011
or sum-
N
SIPROTEC, 7SC80, Manual