Eaton EDR-5000 - Page 774

EDR-5000 IM02602007E
The LVRT element will change into standby again as soon as the system voltage recovers: That means, the voltage
has risen above the preset recover voltage » Vrecover« .
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 which is 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.
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Ride Through Region
Vstart<
Vrecover>
V[x](t[x]) = Curve Setting Points
1.0
0.5
0.9
0.8
0.7
0.6
0.4
0.3
0.2
0.1
0
1.1
t = 0 1.000 2.000 3.0000.500 1.500 2.500
t [s]
V/Vn (in pu)
Trip Region