LJM zero sequence current transformer
Type description
LJM-1,2,3
L: Current transformer
J: Earthing/grounding protection
M: Busbar type
1,2,3: Busbar number
Technical data
Technical data 1: for zero sequence protection
Model | Rated primary current Im(A) | Ith/2S(kA) | Dynamic current(kA) | Weight(Kg) | Insulation level(rated voltage/power frequency withstand voltage) (kV) |
LJM-1 | 1750 | 24/2 | 60 | 77 | 10/30 |
LJM-2 | 3000 | 48/2 | 120 | 118 | |
LJM-3 | 4000 | 72/2 | 180 | 159 |
Mating with relay: DD-11/60, primary residual current 2.4A, setting current of relay 0.06A, excitation impedance at sec-winding parallel connection≥10Ω
Technical data 2: for microcomputer protection
Secondary connection type | Rated current ratio(A) | Accuracy class | Rated secondary output(VA) |
Parallel connection | 30/1 | 10P10 | 3.75 |
Series connection | 60/1 | 7.5 |
