Rogers 
Gas ratio 

C_{2}H_{2}/C_{2}H_{4} 
CH_{4}/H_{2} 
C_{2}H_{4}/C_{2}H_{6} 

< 0,1 
0  1  0 
0,1 … 1 
1  0  0 
1 … 3 
1  2  1 
> 3 
2  2  2 
Nr.  Fault  
0  Normal  0  0  0 
1  Partial discharge (high energy density)  n.r.  1  0 
2  Partial discharge (low energy density)  1  1  0 
3  Discharge (low energy density)  1 → 2  0  1 → 2 
4  Discharge (high energy density)  1  0  2 
5  Thermal fault T < 150°C  0  0  1 
6  Thermal fault 150°C  300°C  0  2  0 
7  Thermal fault 300°C  700°C  0  2  1 
8  Thermal fault T > 700°C  0  2  2 