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Electrical Equipment Overload Detection System

This system detects underload, overload, cable break, phase failure & sequence issues in electrical equipment.

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Electrical Equipment Overload Detection System

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  1. Lx Ly/N IN ~ 90-690V 25 1,0 0,8 20 12 22 11 21 14 24 15 0,6 10 0,4 5 0,2 0 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 Normal operation cos j I [A] Ires L1 L2 L3 N M [Nm] nominal load K1 K2 SIEMENS Ires 5,0A φ-> cos φ = PF Ires -> Active current onDEL -> Current on delay Mem ? -> Memory? NC -> Circuit principle K1 K2 M ▼ M ▲ OK L1 L2 L3

  2. Lx Ly/N IN ~ 90-690V 25 1,0 0,8 20 12 22 11 21 14 24 15 0,6 10 0,4 5 0,2 0 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 Normal operation cos j I [A] Ires L1 L2 L3 N M [Nm] nominal load K1 K2 SIEMENS cosφ 0,86 φ-> cos φ = PF Ires -> Active current onDEL -> Current on delay Mem ? -> Memory? NC -> Circuit principle K1 K2 M ▼ M ▲ OK L1 L2 L3

  3. Lx Ly/N IN ~ 90-690V 25 1,0 0,8 20 12 22 11 21 14 24 15 0,6 10 0,4 5 0,2 0 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 Underload, e.g. broken belt cos j I [A] Ires L1 L2 L3 N M [Nm] underload K1 K2 SIEMENS cosφ φ-> cos φ = PF Ires -> Active current onDEL -> Current on delay Mem ? -> Memory? NC -> Circuit principle K1 K2 M ▼ M ▲ OK L1 L2 L3

  4. Lx Ly/N IN ~ 90-690V 25 1,0 0,8 20 12 22 11 21 14 24 15 0,6 10 0,4 5 0,2 0 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 Overload, e.g. blockage cos j I [A] Ires L1 L2 L3 N M [Nm] overload K1 K2 SIEMENS Ires φ-> cos φ = PF Ires -> Active current onDEL -> Current on delay Mem ? -> Memory? NC -> Circuit principle K1 K2 M ▼ M ▲ OK L1 L2 L3

  5. Lx Ly/N IN ~ 90-690V 12 22 11 21 24 14 Cable break current in remaining cables rises to keep up the torque L1 L2 L3 N K1 K2 SIEMENS Ires φ-> cos φ = PF Ires -> Active current onDEL -> Current on delay Mem ? -> Memory? NC -> Circuit principle K1 K2 M ▼ M ▲ OK L1 L2 L3

  6. Lx Ly/N IN ~ 90-690V 22 12 11 21 14 24 Phase failure of L1 Loss of supply voltage L2 L3 N K1 K2 SIEMENS φ-> cos φ = PF Ires -> Active current onDEL -> Current on delay Mem ? -> Memory? NC -> Circuit principle K1 K2 M ▼ M ▲ OK L1 L2 L3

  7. Lx Ly/N IN ~ 90-690V 22 12 11 21 14 24 Phase failure of L2 Phase shift of approx. +30° => cos φ rises L1 L3 N K1 K2 SIEMENS cosφ φ-> cos φ = PF Ires -> Active current onDEL -> Current on delay Mem ? -> Memory? NC -> Circuit principle K1 K2 M ▼ M ▲ OK L1 L2 L3

  8. Lx Ly/N IN ~ 90-690V 22 12 11 21 14 24 Phase failure of L3 Phase shift of approx. -30° => cos φ falls L1 L2 N K1 K2 SIEMENS cosφ φ-> cos φ = PF Ires -> Active current onDEL -> Current on delay Mem ? -> Memory? NC -> Circuit principle K1 K2 M ▼ M ▲ OK L1 L2 L3

  9. Lx Ly/N IN ~ 90-690V 22 12 11 21 14 24 Phase sequence cos φ becomes (1 - cos φ) L1 L3 L2 N K1 K2 SIEMENS cosφ φ-> cos φ = PF Ires -> Active current onDEL -> Current on delay Mem ? -> Memory? NC -> Circuit principle K1 K2 M ▼ M ▲ OK L1 L2 L3

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