Siemens SIPROTEC 7UM62 User Manual

Functions
2.5 Power System Data 1
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
55
U
E
Connection
At address 223 UE CONNECTION, the user specifies to the device which type of voltage is connected to the
U
E
input. The device establishes from this information the type of processing involved. The U
E
input is used for
either the various stator earth fault protection functions or for rotor earth fault protection using the rated frequen-
cy measurement method (see Section 2.34). The following table shows the interdependencies for each protec-
tion function.
Table 2-2 Setting Options for the U
E
Input and their Impact on the Protection Functions
Transformation Ratio UE
For the conversion of the displacement voltage U
E
in primary quantities, the device requires the primary/sec-
ondary transformation ratio of the transformer delivering the U
E
voltage. With the exception of the rotor earth
fault protection, the 224 FACTOR UE has an impact on those protection functions which process the U
E
input
directly, in accordance with Table 2-2. For this ratio 224 FACTOR UE the following generally applies:
Setting of
Unom
SECONDARY
90% Stator Earth
Fault Protection
Stator Earth Fault
Protection with
3rd Harmonics
100% Stator Earth
Fault Protection
with Bias Voltage
(20 Hz)
Rotor Earth Fault
Protection (R, fn)
Interturn Fault
Protection
(Addr. 223) (Section 2.28) (Section 2.30) (Section 2.31) (Section 2.34) (Section 2.33)
Not connected Computed U0 mea-
sured value is being
processed
(precisely: √3
U0)
Determination of
3rd harmonics
from calculated U0
voltage
(only U0 3rd harm
> stage usable).
–––
Load. resistor Computed U0 mea-
sured value is being
processed
(precisely: √3
U0)
–
U
E
input is being
processed
––
any VT U
E
input is being
processed
(e.g. earth fault pro-
tection on trans-
former side)
––––
broken delta Processing of U
E
input
Processing of U
E
input
U
E
input is being
processed
––
Rotor Computed U0 mea-
sured value is being
processed
(precisely: √3
U0)
––
Processing of U
E
input
–
neutr. transf. Processing of U
E
input
Processing of U
E
input
U
E
input is being
processed
––
Uen-winding Computed U0 mea-
sured value is being
processed
(precisely: √3
U0)
Determination of
3rd harmonics
from calculated U0
voltage
(only U0 3rd harm
> stage usable).
––
Processing of U
E
input

Siemens SIPROTEC 7UM62 Specifications

General

Brand	Siemens
Model	SIPROTEC 7UM62
Category	Protection Device
Language	English