CO M M I SS I O N I N G A N D T E S T I N G G U I D E
21
• Step 3/5
In the cable compartments, connect the
injection device to the cable sealing end of the
same phase.
• Step 4/5
Inject a current equal to the application nominal
current or equal to the maximal current
supported by the primary testing device if the
application nominal current is out of the device
setting range.
• Step 5/5
Check the current metering for the phase and
measured current in other phases on the
protection relay LHMI Measurements view.
Current must be zero in phases which are not
under the primary injection test.
Breakers not installed in the switchgear frame
or restricted access to the busbar compartment
This testing method does not include the
influence of application, such as the circuit
breaker or contactor. Metering cables from the
primary testing device are used to make the
electrical circuit between the cable and bus
compartments.
Danger:
If high voltage cables are
terminated to switchgear frame,
ensure the installation is dead.
Protect against any other live parts.
—
30 Primary test setup
for current sensors
when busbars and
breakers are installed
NOTICE
Circuit
breaker
Circuit
breaker
0V
0V
0V
0V
0V
0V
Primary
tester
~I (A)
0V
L1
I
I
I
I
0V
L2
0V
L3
—
30
—
31
Notice:
“Io-A” in Measurements
view is a measured value, not a
calculated one.
DANGER
WARNING
CAUTION
NOTICE
SAFETY
INSTRUCTIONS
