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6.9.6
Current reversal and weak-end infeed logic for residual
overcurrent protection ECRWPSCH (85)
Prepare the IED for verification of settings as outlined in
Values of the logical signals for ECRWPSCH (85) are available on the local HMI
under
Main menu/Tests/Function status/Scheme communication/ECRWPSCH(85)/
1:ECRWPSCH
. The Signal Monitoring in PCM600 shows the same signals that are
available on the local HMI.
First, test the four step residual overcurrent protection function EF4PTOC (51N/67N)
and then the current reversal and weak-end infeed logic according to the corresponding
instructions. Then continue with the instructions below.
6.9.6.1
Testing the current reversal logic
1.
Inject the polarizing voltage 3V0 to 5% of
VBase
and the phase angle between
voltage and current to 155°, the current leading the voltage.
2.
Inject current (
180° — AngleRCA
) in one phase to about 110% of the set
operating current of the four step residual overcurrent protection (
INDir
).
3.
Check that the IRVL output is activated in the disturbance recorder after the set
time (
tPickUpRev
).
4.
Abruptly reverse the current to
AngleRCA
setting lagging the voltage, to operate
the forward directional element.
5.
Check that the IRVL output still is activated after the reversal with a time delay
that complies with the setting (
tDelayRev
).
6.
Switch off the polarizing voltage and the current.
6.9.6.2
Testing the weak-end infeed logic
If setting
WEI = Echo
1.
Inject the polarizing voltage 3V0 to (180° —
AngleRCA
) of
VBase
and the phase
angle between voltage and current to 155°, the current leading the voltage.
2.
Inject current (180° —
AngleRCA
) in one phase to about 110% of the setting
operating current (
INDir
).
3.
Activate the CRL binary input.
Section 6
1MRK 506 331-UUS A
Testing functionality
134
Commissioning Manual
Содержание Relion 650 Series REL650
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