Writing An Application Configuration To The Ied; Checking Ct Circuits - ABB RELION 650 Series Commissioning Manual

Section 4
Starting up
Setting up the PC to access the IED via a network
The same method is used as for connecting to the front port.
4.6

Writing an application configuration to the IED

When writing a configuration to the IED with PCM600, the IED is automatically set in
configuration mode. When the IED is set in configuration mode, all functions are blocked. The
red LED on the IED flashes, and the green LED is lit while the IED is in the configuration mode.
When the configuration is written and completed, the IED is automatically set into normal
mode. For further instructions please refer to the users manuals for PCM600.
4.7

Checking CT circuits

The CTs must be connected in accordance with the circuit diagram provided with the IED, both
with regards to phases and polarity. The following tests shall be performed on every primary
CT connected to the IED:
• Primary injection test to verify the current ratio of the CT, the correct wiring up to the
protection IED and correct phase sequence connection (that is L1, L2, L3.)
• Polarity check to prove that the predicted direction of secondary current flow is correct
for a given direction of primary current flow. This is an essential test for the proper
operation of the differential function and directional protection functions.
• CT secondary loop resistance measurement to confirm that the current transformer
secondary loop DC resistance is within the specification for the connected protection
functions. When the measured loop resistance is near the calculated value for maximum
DC resistance, perform a complete burden test.
• CT excitation test in order to confirm that the current transformer is of the correct
accuracy rating and that there are no shorted turns in the current transformer windings.
Manufacturer's design curves must be available for the current transformer to compare
the actual results.
• Earthing check of the individual CT secondary circuits to verify that each three-phase set
of main CTs is properly connected to the station earth and only at one electrical point.
• Insulation resistance check.
36
The PC and IED must belong to the same subnetwork for this set-up to work.
The PC and IED must belong to the same subnetwork for this set-up to work.
Check that the wiring is in strict accordance with the supplied connection
diagram.
While the CT primary is energized, the secondary circuit shall never be open
circuited because extremely dangerous high voltages may arise.
1MRK 506 366-UEN A
M11734-2 v6
M12182-2 v15
Commissioning manual