80 Practical examples
shown below. In this example the parameter 16.20 GRID CONNECT MODE is set to
MCB1+MCB3/B.
The maximum measurable stator current must be set by a parameter. The value is
calculated with the following equation:
CT = current transformer ratio
The polarity of a current transformer is determined by the direction the coils are wound
around the core (clockwise or counterclockwise) and the way the leads are brought out of
the transformer case. Current transformers have subtractive polarity and following
designations for installation: P1: primary current, line-facing direction; P2: primary current,
load-facing direction; and S1: secondary current. Correct polarity has to be taken into
account when installing and connecting current transformer to power metering.
Sometimes it is not possible to install current transformers mechanically so that current
flow is from P1 to P2 which is standard. This means that measurement polarity is
reversed. In this case the polarity can be corrected by entering a negative value in this
parameter.
MCB2
DFIG
INU
ISU
NUIM
X1:1
X1:2
X2:1
X2:2
L1
L2
L3
MCB3
MCB1
NDCU
P1,K P2,L
S1,k S2,l
P1,K P2,L
S1,k S2,l
L1
L2
L3
L1
L2
L3
W1
V1
U1
W1
V1
U1
K
L
M
U2
V2
W2
U2
V2
W2
L
C
L
Optional
99.28 MAX MEAS IS
4,5
V
2,73333
ohm
-----------------------------------
CT
⋅
=
Содержание ACS800-67
Страница 1: ...ABB wind turbine converters System description and start up guide ACS800 67 wind turbine converters ...
Страница 4: ......
Страница 76: ...76 Start up with medium voltage stator ...
Страница 99: ...Practical examples 99 1 4 4 3 2 5 6 7 ...
Страница 106: ...106 Practical examples Counterclockwise rotation at drive end D end Power cabinet Encoder ...
Страница 118: ...118 Tracing the source of warnings limits and faults ...
Страница 120: ...Contact us www abb com windconverters 3AUA0000095094 Rev B EN 2017 12 31 ...