Alstom MCAG 34 - Page 18

18
Figure 3 Stability check of restricted earth fault protection
Figure 4 Stability check on restricted earth fault scheme by back energising with a low voltage
supply
A2
Stabilising resistor (if fitted)
Relay
Primary injection
test set
A1
Temporary connection
A
B
C
Metrosil (if fitted)
A2
Stabilising resistor (if fitted)
Relay
A1
Temporary short circuit
A
B
C
LV
supply