Characteristics - Siemens Siprotec 7UM611 Manual

1.3

Characteristics

General Features • Powerful 32-bit microprocessor system.
• Complete digital processing of measured values and control, from sampling and
• Total electrical separation between the internal processing stages of the device and
• Simple device operation using the integrated operator and display panel or by
• Continuous computation and display of measured quantities.
• 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
• Communication with central control and memory storage equipment via serial inter-
• Battery-buffered clock that can be synchronized with an IRIG-B (via satellite) or
• Statistics: Recording of the number of trip signals instigated by the device and
• Operating Hours Counter: Tracking of operating hours of the equipment under load
• Commissioning aids such as connection check, field rotation check, status display
Definite Time Over- • 2 definite time stages I> and I>> for the 3 phase currents (I
current Protection
• Undervoltage seal-in for synchronous machines whose excitation voltage is ob-
(I>) with Undervolt-
age Seal-In
• Optionally additional directional determination with the high current stage I>>.
• Blocking capability e.g. for reverse-interlocking bus-bar protection with any stage.
Inverse Time Over- • Selection possible from various characteristics (IEC, ANSI).
current Protection
• Optionally voltage-controlled or voltage-dependent alteration of current pick-up be-
(voltage-controlled)
• Voltage influencing can be blocked by fuse failure monitor or via voltage transformer
Thermal Overload • Temperature image of current heat losses (overload protection with full memory ca-
Protection
• Additional adjustable warning levels based on temperature rise and current magni-
• Consideration of coolant and ambient temperatures possible.
7UM61 Manual
C53000-G1176-C127-3
digitalization of measured quantities to tripping circuit breakers or other switchgear
devices.
the external transformer, control and DC supply circuits of the system because of
the design of the binary inputs, outputs, and the DC converters.
means of a connected PC running DIGSI
of the device.
faces, optionally via data cable, modem, or optic fibre lines.
DCF77 signal, binary input signal, or system interface command.
logging of currents switched off last by the device, as well as accumulated short-
circuit currents of each pole of the circuit breaker.
being protected.
of all binary inputs and outputs, and test measurement recording.
tained from the machine terminals;
haviour during undervoltage;
protective circuit breaker.
pability, single body thermal model).
tude.
1.3 Characteristics
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4.
, I , I
L1 L2
).
L3
23