Protective Elements
%I2/I1> - Unbalanced Load [46]
Elements:
I2>[1] ,I2>[2]
The
I2>
Current Unbalance element works similar to the
V 012
Voltage Unbalance element. The positive and
negative sequence currents are calculated from the 3-phase currents. The Threshold setting defines a minimum
operating current magnitude of I2 for the 46 function to operate, which insures that the relay has a solid basis for
initiating a current unbalance trip. The »
%(I2/I1)«
setting is the unbalance trip pickup setting. It is defined by the
ratio of negative sequence current to positive sequence current »
%(I2/I1)«.
This function requires positive or negative sequence current magnitude above the threshold setting and the
percentage current unbalance above the »
%(I2/I1)«
setting before allowing a current unbalance trip. Therefore,
both the threshold and percent settings must be met for the specified Delay time setting before the relay initiates
a trip for current unbalance.
All elements are identically structured.
Page 314
EN MRM4 01/11
Summary of Contents for MRM4
Page 1: ...MRM4 HighPROTEC Motor Protection Device Manual DOK HB MRM4E...
Page 3: ...Order Code EN MRM4 01 11 Page 3...
Page 18: ...Important Definitions Page 18 EN MRM4 01 11 41 SG Prot ON 42 SG ON Cmd SG Prot ON SG ON Cmd...
Page 115: ...Navigation Operation Navigation Operation EN MRM4 01 11 Page 115 1 2 3 5 7 6 8 10 9...
Page 162: ...Recorder Name Description I 2 TripCmd Signal Trip Command Page 162 EN MRM4 01 11...
