Manual 37259C
SPM-D11 - Synchronizing Unit
Page 42/79
© Woodward
CTs (Current Transformer)
Current transf.
Generator 0000/x
Generator current transformer
10 to 9.990/x A
For the indication and control of the generator current, it is necessary to enter the
current transducer ratio. The ratio must be selected in a manner to ensure that at
maximum power, at least 60 % of the transformer rated current is flowing. Lower
percentage values may lead to malfunctions. Moreover, additional inaccuracies oc-
cur in the control and monitoring functions.
{X} / 1 A
.......Secondary rated current = 1 A at primary rated current = {X} A;
{X} / 5 A
.......Secondary rated current = 5 A at primary rated current = {X} A;
NOTE
Starting with software version 6.3640 it is possible to perform power measurement for single-phase or
three-phase generators with the SPM-D11. The necessary settings have to be made in the following two
screens.
Connection type
Gen. 1W2
from version 6.3640
Connection type generator
1W / 1W2
1W
................Power measurement in single-phase system
1W2
..............Power measurement in three-phase system
Angle adjustment
Gen. Curr. 000
from version 6.3640
Angle adjustement generator current
-180° to 180°
The angle adjustment allows the use of current transformers, which are installed in
a different current path than L1, for measurement. The angle adjustment serves to
adjust the shift between current and voltage.
Single-phase System
The voltage V
L1N
is shifted by 30° compared with V
L1L2
. This difference must be corrected for power measure-
ment. Additionally, the phase of the current measurement must be taken in consideration.
Current transformer in phase
Connection type generator
Angle adjustment
L1 1W -030°
L2 1W 090°
L3 1W -150°
Three-phase System with Symmetrical Load
For three-phase systems, the angle must be corrected only if the current is measured in L2 or L3, or if a counter
clockwise rotating field is present. If the load is not symmetrical, the current
must
be measured in L1.
Current transformer in
phase
Connection type generator
Angle adjustment for
rotating field right
Angle adjustment for
rotating field left
L1 1W2 000
-060
L2 1W2 120 060
L3 1W2 -120
-180
Rated power
Gen. = 0000kW
Generator rated power
[1] 100 to 9,999 kW; [4] 5 to 9,999 kW
Value of the generator rated power.