Functions
2.2 Voltage Protection 27, 59
SIPROTEC, 7RW80, Manual
C53000-G1140-C233-1, Release date 10.2010
41
2.2.2 Overvoltage Protection 59
Function
The overvoltage protection includes three elements (59-1 PICKUP, 59-2 PICKUP, 59 Vp>). In case of a
high overvoltage, the switchoff is performed with a short-time delay, whereas in case of lower overvoltages, the
switchoff is performed with a longer time delay. When an adjustable setting is exceeded, the 59 element picks
up, and after an adjustable time delay elapses, initiates a trip signal. The time delay is not dependent on the
magnitude of the overvoltage.
Additionally the element 59 Vp> allows the definition of a user defined tripping curve with 20 value pairs (volt-
age/time). Parameterization is done via DIGSI.
For both over-voltage elements 59-1 PICKUP, 59-2 PICKUP the dropout ratio (= V
dropout
/V
pickup
) can be pa-
rameterized.
A parameter is set to specify, whether the measured values of all phases or only phases with the highest value
for monitoring are being used.
The following figure shows the logic diagram of the overvoltage protection function.
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