ABB RELION Series Technical Manual page 688

Section 10
Power quality measurement functions
682
this voltage level to avoid the undesired voltage dip or swell indications. This is
accomplished by converting the variation limits with the Reference voltage setting in
the variation detection module, that is, when there is a voltage different from the
nominal voltage, the Reference voltage setting is set to this voltage.
The Variation enable setting is used for enabling or disabling the variation types. By
default, the setting value is "Swell+dip+Int" and all the alternative variation types are
indicated. For example, for setting "Swell+dip", the interruption detection is not
active and only swell or dip events are indicated.
In a case where Phase mode is "Single Phase" and the dip functionality is available,
the output DIPST is activated when the measured TRMS value drops below the
Voltage dip set 3 setting in one phase and also remains above the Voltage Int set
setting. If the voltage drops below the Voltage Int set setting, the output INTST is
activated. INTST is deactivated when the voltage value rises above the setting
Voltage Int set. When the same measured TRMS magnitude rises above the setting
Voltage swell set 3, the SWELLST output is activated.
There are three setting value limits for dip (Voltage dip set 1..3) and swell activation
(Voltage swell set 1..3) and one setting value limit for interruption.
If Phase mode is "Three Phase", the DIPST and INTST outputs are
activated when the voltage levels of all monitored phases, defined
with the parameter Phase supervision, drop below the Voltage Int set
setting value. An example for the detection principle of voltage
interruption for "Three Phase" when Phase supervision is "Ph A + B
+ C", and also the corresponding start signals when Phase mode is
"Single Phase", are as shown in the example for the detection of a
three-phase interruption.
1MRS758755 A
REC615 and RER615
Technical Manual