POWER QUALITY
PRODUCT FUNCTIONS
1TNC928250M0201
25
3.3.6
Voltage interruption supervision
Voltage interruption is a special case of voltage dip. It provides a second level setting in addi-
tion to voltage dip supervision to assist the operator in network analysis.
The interruption threshold and hysteresis voltage settings are a percentage of the system
rated voltage Un.
In single-phase system, when U
int
falls below the threshold, an alarm is triggered; when U
int
is
equal to or above the dip threshold plus the hysteresis, the alarm is reset.
In three-phase system, when U
int
of any phase falls below the threshold, an alarm is triggered;
The alarm is reset when U
int
of three-phase are recovered to or above the threshold plus the
hysteresis value, the alarm is reset.
Voltage interruption supervision settings
Value range
0=Disable 1=Enable
Default value
0
Threshold
Value range
95-100 %
Default value
95 %
Step value
1 %
Hysteresis
Value range
0-10 %
Default value
2 %
Step value
1 %
