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[lo-uespg-u2-gegsys-20101108, 1, en_US]
Figure 2-48
The overvoltage protection for the negative sequence system can also be blocked via a binary input
BLOCK . The elements of the negative sequence voltage protection are automatically blocked as soon as an
asymmetrical voltage failure is detected („fuse failure monitor", also see Section
sion, margin heading Rapid Measuring Voltage Failure "Fuse-Failure-Monitor") or when tripping of the MCB for
voltage transformers has been signaled via the binary input
blocking").
Overvoltage Zero Sequence System 3V
Figure 2-49
depicts the logic diagram of the zero sequence voltage element. The fundamental frequency is
numerically filtered from the measuring voltage so that the harmonics or transient voltage peaks remain
largely harmless.
The triple zero sequence voltage 3·V
3722) and 59G-2-3V0PICKUP (address 3724). Combined with the associated time delays 59G-1-3V0
DELAY (address 3723) and 59G-2-3V0 DELAY (address 3725) these elements form a two-element over-
voltage protection for the zero sequence system. Here too, the dropout ratio can be set (59G RESET), address
3729). Furthermore, a restraint delay can be configured which is implemented by repeated measuring
(approx. 3 periods).
The overvoltage protection for the zero sequence system can also be blocked via a binary input
BLOCK . The elements of the zero sequence voltage protection are automatically blocked as soon as an asym-
metrical voltage failure was detected ("Fuse-Failure-Monitor", also see Section
sion, margin heading "Fuse-Failure-Monitor (Non-symmetrical Voltages)" or when the trip of the mcb for
voltage transformers has been signaled via the binary input
blocking").
According to
Figure 2-49
3·V
= V
+ V
0
A
B
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
Logic diagram of the overvoltage protection for the negative sequence voltage system V
0
is fed to the two threshold elements 59G-1-3V0PICKUP (address
0
the device calculates the voltage to be monitored
+ V
.
C
2.8 Undervoltage and Overvoltage Protection (optional) 27/59
2.14.1 Measurement Supervi-
>FAIL:Feeder VT (internal indication "internal
2.14.1 Measurement Supervi-
>FAIL:Feeder VT (internal indication "internal
Functions
2
>59-V2
>59-3V0
111
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