Settings - Siemens Siprotec 7UM611 Manual

2 Functions
The 1205 U< undervoltage stage (positive-sequence voltage) is set to a value below
Undervoltage Seal-
In the lowest phase-to-phase voltage admissible during operation, e.g. 80 V.
The seal-in time 1206 T-SEAL-IN limits the pickup seal-in introduced by the overcur-
rent/undervoltage. It must be set to a value higher than the T I> time delay.
The dropout ratio r = I
I> DOUT RATIO. The recommended value is r = 0.95. For special applications, e.g.
overload warning, it can be set to a higher value (0.98).
Examples:
The following secondary setting values result from this specification:
2.6.3

Settings

Addresses which have an appended "A" can only be changed with DIGSI, under Ad-
ditional Settings.
The table indicates region-specific presettings. Column C (configuration) indicates the
corresponding secondary nominal current of the current transformer.
Addr. Parameter
1201 O/C I>
1202 I>
1203 T I>
44
/I
off on
Pick-up thresh- 1.4 · I
N Mach.
old
Trip Time Delay 3 sec
Undervoltage 0.8 · I
N Mach.
Seal-In
Holding time of 4 sec
U<
Dropout Ratio 0.95
Rated current IN, 483 A
Mach
Rated current IN, 500 A
CT, prim
Rated current IN, 1 A
sec
C Setting Options
OFF
ON
Block relay
1A 0.05 .. 20.00 A
5A 0.25 .. 100.00 A
0.00 .. 60.00 sec; ∞
of the overcurrent pickup I> is specified at address 1207
Rated voltage 6.3 kV
U
N, Mach
Rated voltage U 6.3 kV
N
VT. prim
Rated voltage 100 V
U
N, sec
Default Setting
OFF
1.35 A
6.75 A
3.00 sec
Comments
Overcurrent Time Protec-
tion I>
I> Pickup
T I> Time Delay
7UM61 Manual
C53000-G1176-C127-3