Question 1-5

1
Question 1-5
Is the transformer protection by mean of
protection switch associated or not with partial
range fuses a general trend ?
2
fuse protection advantages
prospective short circuit of 31.5 kA on a 12 kV
network
3
Compact substation
SPT
2 functions RMU
MV/LV winding.
LV panel
Oil retention tank
4
Self protection diagram
3 phases Short-circuit 2 MV fuses melt
Electric fault
Oil leakage
Over pressure
Oil T rise
Fault
Phase B delayed opening
Detection
Micro-fuse
Level sensor
Pressure sensor
Thermostat
Action
Insulation
3 phases disconnecting