11.10.3 Voltage control TR1ATCC, TR8ATCC, TCMYLTC, TCLYLTC
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to
verify settings".
The automatic voltage control for tap changer, single control TR1ATCC (90) is based on
a transformer configuration that consists of one tap changer on a single two-winding
power transformer.
The automatic voltage control for tap changer, parallel control TR8ATCC (90), if
installed, may be set to operate in Master Follower (MF) mode, or Minimise Circulating
Current (MCC) mode. The commissioning tests for each parallel control mode are
addressed separately in the following procedure.
Secondary injection of load current (I
L
) and secondary bus voltage (U
B
) equivalent
quantities are required during installation and commissioning tests. The test consists
mainly of:
1. Increasing or decreasing the injected voltage or current at the analogue inputs of the
IED.
2. Checking that the corresponding commands (Lower or Raise) are issued by the
voltage control function.
Setting confirmation is an important step for voltage control in the installation and
commissioning phase to ensure consistency of power systems base quantities, alarm/
blocking conditions and parallel control settings for each transformer control function.
Before starting any test, verify the following settings in PCM600 or the local HMI for
TR1ATCC (90), TR8ATCC (90) and TCMYLTC (84) and TCLYLTC (84).
• Confirm power system base quantities I1Base, I2Base, VBase.
Main menu/Settings/Setting Group N/Control/
TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC:x/General
and
Main menu/Settings/Setting Group N/Control/
TransformerVoltageControl(ATCC,90)/TR1ATCC:x
.
• Confirm that the setting for short circuit impedance Xr2 for TR1ATCC (90) or
TR8ATCC (90) is in accordance with transformer data:
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 247
Commissioning manual
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