Siemens SIPROTEC 5, Manual

Page: 344 / 490

Calculation of the source impedances of the left and right side of the supplying line:
Z
s-b
= (1.1 • 110 kV) / (√3 • 20 kA) • e i 72° = 1.08 + 3.32i Ω
Z
s-a
= (1.1 • 110 kV) / (√3 • 12 kA) • e i 83° = 0.71 + 5.77i Ω
Calculation of the total impedances between the generators:
Z
Σ
= Z
s-a
+ Z
s-b
+ Z
line
= (1.08 + 3.32i + 0.71 + 5.77i + 5.17 + 19.31i) Ω = 6.96 + 28.41i Ω
Calculation of the distance to the power-swing center:
Z
Reach-A
= 0.5 • Z
Σ
- Z
s-a
= 0.5 • (6.96 + 28.41) - (0.71 + 5.77i) Ω = 2.77 + 8.44i Ω
Z
Reach-B
= 0.5 • Z
Σ
- Z
s-a
= 0.5 • (6.96 + 28.41) - (1.08 + 3.32i) Ω = 2.40 + 10.88i Ω
i
i
NOTE
The power-swing trigger starts operating at a minimum current of 10 % Irated. Power-swing detection
drops out once the current is below the minimum current. Power-swing frequencies between 0.1 Hz and
8 Hz are detected.
For the setting value
X reach
, use a safety margin of at least 20 %, yielding this result:
X reach
= 1.2 • 8.5 Ω = 10.2 Ω.
Use the same setting value for
R (ph-g)
.
Use double the value of
X reach
for
R (ph-ph)
.
Settings
Addr. Parameter C Setting Options Default Setting
Trigger Psum 1
_:9901:1 Trigger Psum 1:Mode
•
off
•
on
•
test
off
_:9901:111 Trigger Psum 1:Power
direction
•
negative
•
positive
positive
_:9901:101 Trigger Psum 1:Max.
trigger active
•
no
•
yes
yes
_:9901:105 Trigger Psum 1:Max.
trigger 1 A @ 100 Irated 0.36 Wto 6000.00 W 207.85 W
5 A @ 100 Irated 1.80 W to 300000.00 W 1039.23 W
_:9901:113 Trigger Psum 1:Max.
trigger hysteresis 0.900 p.u. to 0.990 p.u. 0.980 p.u.
_:9901:102 Trigger Psum 1:Min.
trigger active
•
no
•
yes
yes
_:9901:106 Trigger Psum 1:Min.
trigger 1 A @ 100 Irated 0.36 Wto 6000.00 W 138.56 W
5 A @ 100 Irated 1.80 W to 300000.00 W 692.82 W
_:9901:114 Trigger Psum 1:Min.
trigger hysteresis 1.010 p.u. to 1.100 p.u. 1.020 p.u.
_:9901:103 Trigger Psum 1:dM/dt
rise active
•
no
•
yes
no
_:9901:107 Trigger Psum 1:dM/dt
rise (/Filter time) 1 A @ 100 Irated 0.36 Wto 6000.00 W 34.64 W
5 A @ 100 Irated 1.80 W to 300000.00 W 173.21 W
_:9901:115 Trigger Psum 1:dM/dt
rise hysteresis 0.900 p.u. to 0.990 p.u. 0.980 p.u.
_:9901:104 Trigger Psum 1:dM/dt
drop active
•
no
•
yes
no
7.5.4.9
Fault Recorder
7.5 Trigger Functions 3-Phase
344 SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017