Characteristics - Siemens siprotec SJ62 User Manual

1.3

Characteristics

General Character-
istics
Time Overcurrent
Protection 50, 51,
50N, 51N
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
• Powerful 32-bit microprocessor system.
• Complete digital processing and control of measured values, from the sampling of
the analog input quantities 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 con-
nected 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 eight system faults (fault in a network)
with real-time information as well as instantaneous values for fault recording for a
maximum time range of 5 s.
• Constant monitoring of the measurement quantities, as well as continuous self-di-
agnostics 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 that can be synchronized with an IRIG-B (via satellite) or
DCF77 signal, binary input signal, or system interface command.
• Statistics: Recording of the number of trip signals instigated by the device and
logging of currents switched off last by the device, as well as accumulated short
circuit currents of each pole of the circuit breaker.
• Operating Hours Counter: Tracking of operating hours of the equipment being pro-
tected.
• Commissioning aids such as connection check, direction determination, status in-
dication of all binary inputs and outputs, easy check of system interface and influ-
encing of information of the system interface during test operation
• Two definite time overcurrent protective elements and one inverse time overcurrent
protective element for phase current and ground current I
3I ;
0
• Two-phase operation of the overcurrent protection (I
• Different curves of common standards are available for 51 and 51N, or a user-
defined characteristic;
• Blocking capability e.g. for reverse interlocking with any element;
• Instantaneous tripping by any overcurrent element upon switch onto fault is possi-
ble;
• Second harmonic inrush restraint.
1.3 Characteristics
or summation current
N
, I ) possible;
A C
28