Siemens SIPROTEC 4 7UT6 Series Manual page 67

•
Address 731 EARTH IX3 AT with the options Terminal R7 or Terminal R8 (not for high-sensitivity
input),
•
Address 732 IN-PRI CT IX3 = primary rated CT current,
•
Address 733 IN-SEC CT IX3 = secondary rated CT current. (entfällt bei empfindlichem Eingang),
•
Address 734 FACTOR CT IX3 = CT transform. ratio ((only for high-sensitivity input).
For the auxiliary measuring input X4
•
Address 741 EARTH IX4 AT with the options Terminal P7 or Terminal P8 (not for high-sensitivity
input),
•
Address 742 IN-PRI CT IX4 = primary rated CT current,
•
Address 743 IN-SEC CT IX4 = secondary rated CT current. (not for high-sensitivity input),
•
Address 744 FACTOR CT IX4 = CT transform. ratio (only for high-sensitivity input).
NOTE
i
i
For devices in panel surface mounted housing, terminal designations apply as per
Table 2-4
Flush mounted
housing
Terminal Q7
Terminal Q8
Terminal N7
Terminal N8
Terminal R7
Terminal R8
Terminal P7
Terminal P8
Voltage Transformer Data
If the device is equipped with measuring voltage inputs and these inputs are assigned, the voltage transformer
data are of relevance.
For the 3-phase voltage input, you set at address 801 UN-PRI VT SET the primary rated VT voltage (phase-
tophase), and at address 802 UN-SEC VT SET the secondary rated VT voltage.
If the reverse power protection with high-precision active power measurement is used, a correction of the
angle faults of the current and voltage transformers is particularly important, as in this case a very low active
power is computed from a very high apparent power (for small cos ). In other cases, absolute compliance
with the angle of measured values is usually not required. In 7UT6x angle errors are corrected in the voltage
paths. The question of which current transformer set refers to the correction, is thus irrelevant, and an influ-
ence on the currents for differential protection and all current functions by this correction is avoided. All
power functions are corrected on the other side. The angle correction is not important to the pure voltage
functions (overexcitation protection, undervoltage protection, overvoltage protection, frequency protection),
as the precise phase angle of the voltages is not relevant there. Set the resulting angle difference of the
current and voltage transformers relevant for the reverse power protection under address 803 CORRECT. U
Ang. In electrical machines, determination of the corrective value is possible at primary commissioning of the
machine.
For the 1-phase voltage input, you set at address 811 UN-PRI VT U4 the primary rated voltage of the
connected 1-phase voltage transformer, and at address 812 UN-SEC VT U4 the secondary voltage. The
addresses 811 and 812 must be set if the U4 transformer set has a different reference than the VT SET.
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
Terminal designation with surface mounted housing
corresponds to surface mounted housing terminals
7UT612
12
27
–
–
6
21
–
–
7UT613 7UT633
22 47
47 97
11 36
36 86
18 43
43 93
– –
– –
Functions
2.1 General
Table 2-4.
1-phase current
input
7UT635
47
ΙX1
97
36
ΙX2
86
43
ΙX3
93
32
ΙX4
82
67