Siemens SIPROTEC 7UT613 series Manual page 401

Protected Object Generator/Motor/
Busbar/Line
Phase Angle ↓
ϕ
180°
L1M2
ϕ
60°
L2M2
ϕ
300°
L3M2
7UT613/63x Manual
C53000-G1176-C160-2
• Phase angle measurement for measuring location M1 with test current:
Check the phase angle under measurement values → secondary → phase
angles of side 1 of the protected object. All angles are referred to I
ing values must result approximately for a clockwise phase rotation:
ϕ ≈ 0°
L1 M1
ϕ ≈ 240°
L2 M1
ϕ ≈ 120°
L3 M1
If the angles are wrong, reverse polarity or swapped phase connections on measur-
ing location M1 may be the cause.
– Switch off the test source and the protected object (shut down the generator) and
earth it.
– Re-check the plant connections to the device and the test arrangement and
correct them.
– Repeat test and re-check the current angles.
• Phase angle measurement for measuring location M2 with test current:
Check the phase angle under measurement values → secondary → phase
angles of measuring location M2 of the protected object. All angles are referred to
I
.
L1M1
Consider that always the currents flowing into the protected object are defined as
positive: That means that, with through-flowing in-phase currents, the currents
leaving the protected object at measuring location M2, have reversed polarity (180°
phase displacement) against the corresponding in-flowing currents at measuring lo-
cation M1.
Exception: With transverse differential protection, the currents of the corresponding
phase have equal phase!
For clockwise phase rotation and without phase displacement, the angles should
be approximately:
ϕ ≈ 180°
L1 M2
ϕ ≈ 60°
L2 M2
ϕ ≈ 300°
L3 M2
When measuring across a power transformer, approximately the values according
to Table 3-28 result for clockwise phase rotation:
Table 3-28 Displayed phase angle dependent on the protected object (three-phase)
Transformer with Vector Group Numeral
0 1
180° 150° 120° 90°
60° 30°
300° 270° 240° 210° 180° 150° 120° 90°
1)
Angles are valid if the high voltage side is defined as side 1, otherwise read 360° minus the
stated angle
2 3 4 5
60° 30°
0° 330° 300° 270° 240° 210° 180° 150° 120° 90°
3.3 Commissioning
L1M1
1)
6 7 8 9
0° 330° 300° 270° 240° 210°
60° 30°
. The follow-
10 11
0° 330°
401