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Functions
2.2 Voltage Protection 27, 59
Connection, threephase
(parameter213)
Vab, Vbc, VGnd
Vab, Vbc
Vab, Vbc, VSyn
Vab, Vbc, Vx
Vph-g, VSyn
The positive and negative sequence voltages stated in the table are calculated from the phase-to-ground
voltages.
Overvoltage Protection 59
2.2.2
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
(voltage/ time). Parameterization is done via DIGSI.
For both over-voltage elements 59-1 PICKUP, 59-2 PICKUP the dropout ratio (= V
parameterized.
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.
38
Selectable voltage
parameter 614/ 615
Vphph (smallest phase-to-phase voltage)
V1 ((positive sequence voltage)
None (direct evaluation of the voltage connected to
voltage input 1)
Threshold to be set as
Phase-to-phase voltage
Positive sequence voltage· √3
Direct voltage value
/V
) can be
dropout
pickup
SIPROTEC 4, 7RW80, Manual
C53000-G1140-C233-4, Edition 07.2018
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