Introduction
1.3 Characteristics
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
29
Reverse Power Protection
• Calculation of power from positive sequence components.
• Highly sensitive and precise active power measurement (detection of small motoring powers even with low
power factor cos ϕ, angle error compensation).
• Insensitive to power fluctuations.
• Long-time stage and short-time stage (active with closed emergency tripping valve).
Forward Power Supervision
• Calculation of power from positive sequence components.
• Supervision the active power output for undershooting (P>) or overshooting (P<) the output specified with
individually adjustable power limits.
• Optional high-speed or high-accuracy measurement.
Impedance Protection
• Overcurrent pickup with undervoltage seal-in (for synchronous machines which take their excitation voltage
from the terminals).
• 2 impedance zones, 1 overreach zone (switchable via binary input), 4 time stages.
• Polygonal tripping characteristics;
• Power Swing Blocking (to be activated)
Out-of-step Protection
• Based on the well-proven impedance measurement method.
• Measurement enabling by positive sequence current component, and measurement blocking by negative
sequence component.
• Evaluation of the course of the complex impedance vector;
• Optimum matching to power system conditions by selectable slope of the square wave characteristic.
• Reliable distinction between power swing centre being in the power system network and in the generator
unit area.
Undervoltage Protection 27
• Two-stage undervoltage measurement of positive sequence component of voltages.
• Additional stage with settable, voltage-dependent time characteristic.
Overvoltage Protection 59
• Two-stage overvoltage measurement of the highest of the three voltages.
• Optionally with phase-to-phase voltages or phase-to-earth voltages.
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