11.11.4 Function revision history
GUID-CC62CA75-201A-4C5D-9FD4-89DBFD56F97C v2
11.11.5 Voltage control TR1ATCC, TR8ATCC, TCMYLTC, TCLYLTC
SEMOD175185-3 v13
Prepare the IED for verification of settings as outlined in section
"Requirements" and section "Preparing
for test" in this chapter.
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, V Base.
Main menu /Settings /IED Settings /Control /TransformerVoltageControl(90, U↕) /TR1ATCC(90,
U↕):x/TR8ATCC(90, U↕||):x /General
and
Main menu /Settings /IED Settings /Control /TransformerTapControl(84,⇅) /TCMYLTC(84,⇅):x
• Confirm that the setting for short circuit impedance Xr2 for TR1ATCC (90) or TR8ATCC (90) is in
accordance with transformer data:
• Short circuit impedance, available on the local HMI under Main menu /Settings /IED
settings /Control /TransformerVoltageControl(90, U↕) /TR1ATCC(90, U↕):x/TR8ATCC(90,
U↕||):x /Xr2
• Confirm that the setting for TCMYLTC (84) or TCLYLTC (84) is in accordance with transformer data:
Section 11 1MRK 504 165-UUS Rev. J
Testing functionality by secondary injection
254 Transformer protection RET670
Commissioning manual
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