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If the voltage transformers are located on the line side, the measuring voltages will be missing when the line is
disconnected. To avoid that the undervoltage levels in these cases are or remain picked up, the current crite-
rion
CURR.SUP.Uphph<
(address 3768) is switched
ON
. With busbar side voltage transformers it can be
switched
OFF
. However, if the busbar is dead, the undervoltage protection will pick up and expire and then
remain in a picked-up state. It must therefore be ensured in such cases that the protection is blocked by a
binary input.
If the 7VK61 is operated without current transformer connection, the current criterion is of no use and associ-
ated parameters are hidden.
Undervoltage positive sequence systemU
1
The positive sequence undervoltage stages can be used instead of or in addition to previously mentioned
undervoltage stages. Depending on your choice, set address 3771
U1<(<)
to
ON
,
OFF
,
Alarm Only
or
U<Alarm U<<Trip
.
Basically, the same considerations apply as for the other undervoltage stages. Especially in case of stability
problems, the positive sequence system is advantageous, since the positive sequence system is relevant for
the limit of the stable energy transmission.
To achieve the two-stage condition, the
U1<
stage (address 3772) is combined with a greater time delay
T
U1<
(address 3773), and the
U1<<
stage (address
U1<<
) with a shorter time delay T
T U1<<
(address 3775).
Note that the positive sequence system is calculated according to its defining equation
U
1
=
1
/
3
·|U
L1
+ a·U
L2
+ a
2
·U
L3
|. For symmetrical voltages this is equivalent to a phase-to-earth voltage.
The dropout to pickup ratio
U1<(<) RESET
can be set in address 3779. This parameter can only be altered in
DIGSI at Display Additional Settings.
If the voltage transformers are located on the line side, the measuring voltages will be missing when the line is
disconnected. To avoid that the undervoltage levels in these cases are or remain picked up, the current crite-
rion
CURR.SUP.U1<
(address 3778) is switched
ON
. With busbar side voltage transformers it can be switched
OFF
. However, if the busbar is dead, the undervoltage protection will pick up and expire and then remain in a
pickedup state. It must therefore be ensured in such cases that the protection is blocked by a binary input.
If the 7VK61 is operated without current transformer connection, the current criterion is of no use and associ-
ated parameters are hidden.
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
Addr.
Parameter
Setting Options
Default Setting
Comments
3701
Uph-e>(>)
OFF
Alarm Only
ON
U>Alarm U>>Trip
OFF
Operating mode Uph-e over-
voltage prot.
3702
Uph-e>
1.0 .. 170.0 V
85.0 V
Uph-e> Pickup
3703
T Uph-e>
0.00 .. 100.00 sec
2.00 sec
T Uph-e> Time Delay
3704
Uph-e>>
1.0 .. 170.0 V
100.0 V
Uph-e>> Pickup
3705
T Uph-e>>
0.00 .. 100.00 sec
1.00 sec
T Uph-e>> Time Delay
3709A
Uph-e>(>) RESET
0.30 .. 0.99
0.98
Uph-e>(>) Reset ratio
3711
Uph-ph>(>)
OFF
Alarm Only
ON
U>Alarm U>>Trip
OFF
Operating mode Uph-ph over-
voltage prot.
3712
Uph-ph>
2.0 .. 220.0 V
150.0 V
Uph-ph> Pickup
3713
T Uph-ph>
0.00 .. 100.00 sec
2.00 sec
T Uph-ph> Time Delay
3714
Uph-ph>>
2.0 .. 220.0 V
175.0 V
Uph-ph>> Pickup
3715
T Uph-ph>>
0.00 .. 100.00 sec
1.00 sec
T Uph-ph>> Time Delay
2.5.4
Functions
2.5 Under and over-voltage protection (optional)
110
SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
Содержание SIPROTEC 4 7VK61
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