Siemens SIPROTEC 7UM62 - Page 335

Functions
2.49 Auxiliary Functions
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
335
With the following parameters from the Power System Data 1:
In addition measured values are computed by the protection functions and made available:
Measured Values of Rotor Earth Fault Protection (Rn, fn)
The following secondary values are available: System-frequency displacement voltage U
RE
(= U
E
), earth fault
current II
RE
(= I
ee1
) and rotor earth resistance R
earth
, total resistance R
tot
, total reactance X
tot
and phase angle
ϕZ
tot
of the total resistance of the rotor earth fault protection.
Measured Values of the Rotor Earth Fault Protection (1–3 Hz)
Frequency and amplitude of the 1-3 Hz generator (7XT71) f
g
, U
g
, current in the rotor circuit I
g
, charge at polarity
reversal Q
C
and rotor earth resistance R
earth
.
Measured Values of the Stator Earth Fault Protection (20 Hz)
Voltage and current in the stator earth circuit U
SES
and I
SEF
, the specific stator earth resistances R
sef
and R
sefp
(primary) and the phase angle ϕ
SEF
between the current and the voltage at 20 Hz.
Definition of Power Measurement
The 7UM62 uses the generator reference-arrow system. The power output is positive.
Figure 2-147 Definition of Positive Direction of Reference Arrows
U
DC
/I
DC
(measur-
ing trans-
ducer 1)
U
DC
in V- no primary values
I
DC
in mA-
U
exc
(mea-
suring
transducer
3)
U
exc
no primary value
Measured
Values
second-
ary
primary %
Parameter Address Parameter Address
Unom PRIMARY 221 FACTOR IEE1 205
Unom SECONDARY 222 FACTOR IEE2 213
IN-PRI I-SIDE1 202 FACTOR UE 224
IN-SEC I-SIDE1 203 UN GEN/MOTOR 251
IN-PRI I-SIDE2 211 SN GEN/MOTOR 252
IN-SEC I-SIDE2 212 Uph / Udelta 225
UN-PRI SIDE 1 241 SN TRANSFORMER 249