Writing An Application Configuration To The Ied; Checking Ct Circuits - ABB Relion 670 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 A, B, C.)
• 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.
• Grounding check of the individual CT secondary circuits to verify that each three-phase set of main
CTs is properly connected to the station ground and only at one electrical point.
• Insulation resistance check.
46
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.
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