Introduction
1.3 Characteristics
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
27
1.3 Characteristics
General Features
• Powerful 32-bit microprocessor system.
• Complete digital processing of measured values and control, from sampling and digitalization of measured
quantities to tripping circuit breakers or other switchgear devices.
• Total galvanic and disturbance-immune separation between the internal processing stages of the device and
the measuring, control and supply circuits of the system using measurement transducers, binary input and
output modules and and the DC converters.
• Simple device operation using the integrated operator panel or by means of a connected personal computer
running DIGSI.
• Continuous computation and display of operating measurement values.
• Storage of fault messages and instantaneous or rms values for fault recording.
• Continuous monitoring of measured values as well as of the hardware and software of the device.
• Communication with central control and memory storage equipment via serial interfaces, optionally via data
cable, modem, or optic fibre lines.
• 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 under load being protected.
• Commissioning aids such as connection check, field rotation check, status display of all binary inputs and
outputs, and test measurement recording.
Definite-Time Overcurrent Protection (I>) with Under-voltage Seal-In
• 2 instantaneous (definite-time) stages, I> and I>>, for the 3 phase currents (I
L1
, I
L2
, I
L3
) on side 1 or side 2.
• Seal-in of overcurrent pickup I> in case of undervoltage (e.g. for synchronous machines whose excitation
voltage is obtained from the machine terminals);
• Additional directional determination with the I>> high-current stage optionally available;
• Blocking capability e.g. for reverse-interlocking busbar protection with any stage.
Inverse Time Overcurrent Protection (voltage-controlled)
• Selection possible from various characteristics (IEC, ANSI).
• Optionally voltage-controlled or voltage-dependent alteration of current pick-up behaviour during undervolt-
age;
• Voltage influencing can be blocked by fuse failure monitor or via voltage transformer protective circuit break-
er.
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