POWER QUALITY
PRODUCT FUNCTIONS
1TNC928250M0201
22
Current unbalance supervision settings
Value range
0=Disable 1=Enable
Default value
0
Threshold
Value range
50-90 %
Defaults value
50 %
Step value
1 %
Hysteresis
Value range
0-10 %
Default value
2 %
Step value
1 %
3.3.3
Voltage unbalance supervision
FC610 monitors unbalanced voltage and voltage unbalanced condition.
Unbalanced voltage is presented as a percentage value following below calculation and displayed di-
rectly through HMI.
U
𝑛𝑏𝑎
=
max{|𝑈
12
− 𝑈
𝑎𝑣𝑔
|, |𝑈
23
− 𝑈
𝑎𝑣𝑔
|, |𝑈
31
− 𝑈
𝑎𝑣𝑔
|}
𝑈
𝑎𝑣𝑔
Where
U
𝑎𝑣𝑔
=
𝑈
12
+ 𝑈
23
+ 𝑈
31
3
The voltage unbalance threshold and hysteresis are both presented as percentage value. A volt-
age unbalance event is detected when voltage unbalance value U
nba
is above the threshold. The
event ends when the U
nba
is equal to or below the threshold minus the hysteresis.
Voltage unbalance supervision settings
Value range
0=Disable 1=Enable
Default value
0
Threshold
Value range
50-90 %
Default value
50 %
Step value
1 %
Hysteresis
Value range
0-10 %
Default value
2 %
Step value
1 %