Woodward HighPROtec MCDLV4, Manual, Page: 965 / 1275

Protective Elements
Auto Reclosure controlled LVRT
In case that the
LVRT should be able to ride through auto reclosures, the parameter »ARControlledLVRT« has to
be set to »
active«.
In order to supervise the Low Voltage Ride Through events during reclosure, the user has to set the supervision
timer »tLVRT
« at least equal or greater than the complete Multi-Shot AR-runtime. In addition to that the number of
permitted LVRTs has to be set whichis usually the number of auto reclosure attempts. The actual LVRT supervision
will be controlled to ride through the preset LVRT voltage pattern. By reaching the preset number of LVRT events
» NumberOfLVRT«, the actual LVRT supervision assumes that the detected system fault is permanent, ignores the
voltage profile and issues a tripping command instantaneously in order to disconnect the distributed resource from
the electrical power system.
965 MCDLV4 DOK-HB-MCDLV4-2E