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Note
If parameter CURRENT SUPERV. is set to disabled in address 5120, the device picks up immediately without
measurement voltage and the undervoltage protection function in pickup. Apply measuring voltage or block the
voltage protection to continue with configuration. Moreover you have the option of setting a flag via device op-
eration for blocking the voltage protection. This initiates the reset of the pickup and device configuration can be
resumed.
2.4.2
Overvoltage Protection 59
Function
The overvoltage protection has two elements. In case of a high overvoltage, tripping switch off is performed
with a short-time delay, whereas in case of less severe overvoltages, the tripping is performed with a longer
time delay. When one of the adjustable settings is exceeded, the 59 element picks up and trips after an adjust-
able time delay has elapsed. The time delay is not dependent on the magnitude of the overvoltage.
The dropout ratio for the two overvoltage elements (= V
The pickup voltages and time delays can also be set phase-specifically.
The following figure shows the logic diagram of the overvoltage protection function.
The logic diagram also applies for overvoltage protection which can be set phase-specifically (Vphph
selective or Vph-n selective). The thresholds and time delays are to be replaced with the phase-spe-
cific values.
SIPROTEC, 7SC80, Manual
E50417-G1140-C486-A1, Release date 12.2011
2.4 Voltage Protection 27, 59
/V
) can be set.
dropout value
pickup value
Functions
91
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