GE MFAC 34

Stabilising resistor (if fitted)
Relay
A2
A1
Metrosil
Ammeter
(in plug bridge circuit)
V
Figure 1 Secondary injection of relay to check secondary operating current, setting voltage and
relay operating current.
A1
Primary injection
test set
V
Stabilising resistor (if fitted)
A2
Relay
Ammeter (in plug bridge circuit)
Figure 2 Sensitivity check of restricted earth fault scheme by primary injection.
15