32
2
OPERATION
This chapter gives details of how to test many common types of protection device using the
200A-3PH mk2.
2.1
Three Phase Over Current Relays
The configuration shown in figure 2.1 is suitable for testing over-current relays, and will
measure the time delay between the time when the “on” pushbutton is pressed and the time
the relay trips.
Figure 2.1 Connections for testing over-current relays
2.1.1
Connections
Ensure that the output is switched off and that the relay is isolated before making any
connections.
Connect the relay contacts to CONTACT SET 1.
Connect the relay current coils to the 3 phase outputs, selecting suitable leads from the lead
set depending on the current to be injected.
Relay
Contacts
Relay Current
Coil A
Relay Current
Coil B
Relay Current
Coil C
Overcurrent Relay
