Check The Undervoltage Block Function; Check The Upper And Lower Busbar Voltage Limit; Check The Overcurrent Block Function - ABB RET670 Installation And Commissioning Manual

Section 13
Verifying settings by secondary injection
13.11.4.4
13.11.4.5
13.11.4.6
186
involve locating the allocated binary output for a low pulse command in the
Signal Matrix in PCM600 and monitoring a positive from this output.
6. Return the applied voltage to USet.

Check the undervoltage block function

1. Confirm the setting for Ublock, nominally at 80% of rated voltage.
2. Confirm the voltage control function response to an applied voltage below
Ublock, by reviewing the setting in the local HMI under Main menu/Settings/
General settings/Control/TransformerVoltageControl(ATCC,90)/VCSx/
VCPx/UVBk that may cause an alarm, total or automatic block of the voltage
control function to be displayed on the local HMI.
3. Apply a voltage slightly below Ublock and confirm the response of the
voltage control function.

Check the upper and lower busbar voltage limit

1. Confirm the settings for Umin and Umax in the local HMI under Main menu/
Settings/Setting group N/Control/TransformerVoltageControl(ATCC,
90)/VCSx/VCPx/Voltage/Umax or Umin
2. Confirm the voltage control function response to an applied voltage below
Umin and above Umax, by reviewing the settings in the local HMI under
Main menu/Settings/General settings/Control/
TransformerVoltageControl(ATCC,90)/VCSx/VCPx/UVPartBk and
Main menu/General Settings/Control/TransformerVoltageControl/VCSx/
VCPx/OVPartBk. These conditions may cause an alarm, total or automatic
block of the voltage control function to be displayed on the local HMI.
3. Decrease the injected voltage slightly below the Umin value and check for the
corresponding blocking or alarm condition on the local HMI. For an alarm
condition, the voltage regulation function is not blocked and a raise command
should be issued from the IED.
4. Increase the applied voltage slightly above the Umax value and check for the
corresponding blocking or alarm condition on the local HMI. For an alarm
condition, the voltage regulation function is not blocked and a lower
command should be issued from the IED.

Check the overcurrent block function

1. Confirm the setting for Iblock in the local HMI under Main menu/Settings/
Setting group N/Control/TransformerVoltageControl(ATCC,91)/VCSx/
VCPx/TCCtrl/Iblock
2. Confirm the voltage control function response to an applied current above
Iblock, by reviewing the settings in the local HMI under Main menu/Settings/
1MRK 504 088-UEN C
Installation and commissioning manual