PHQVVR contains a blocking functionality. It is possible to block a set of functionoutputs or the function itself, if desired.10.3.4 Operation principleThe function can be enabled and disabled with the Operation setting. Thecorresponding parameter values are "On" and "Off".The operation of the voltage variation detection function can be described with amodule diagram. All the modules in the diagram are explained in the next sections.U_AU_BU_CI_AI_BI_CGUID-91ED3E3D-F014-49EE-B4B0-DAD2509DD013 V1 ENFigure 413: Functional module diagram10.3.4.1 Phase mode settingPHQVVR is designed for both single-phase and polyphase ac power systems, andselection can be made with the Phase mode setting, which can be set either to the"Single Phase" or "Three Phase" mode. The default setting is "Single Phase".The basic difference between these alternatives depends on how many phases areneeded to have the voltage variation activated. When the Phase mode setting is"Single Phase", the activation is straightforward. There is no dependence betweenthe phases for variation start. The START output and the corresponding phase startare activated when the limit is exceeded or undershot. The corresponding phasestart deactivation takes place when the limit (includes small hysteresis) isundershot or exceeded. The START output is deactivated when there are no moreactive phases.However, when Phase mode is "Three Phase", all the monitored phase signalmagnitudes, defined with Phase supervision, have to fall below or rise above thelimit setting to activate the START output and the corresponding phase output, that1YHT530004D05 D Section 10Power quality measurement functions615 series 773Technical Manual
