ABB Relion 670 Series Commissioning Manual page 175

1MRK 511 403-UEN Rev. K
The automatic voltage control for tap changer, parallel control TR8ATCC, 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
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,
TR8ATCC and TCMYLTC and TCLYLTC.
• Confirm power system base quantities I1Base, I2Base, U 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 or TR8ATCC is in
accordance with transformer data:
•
• Confirm that the setting for TCMYLTC or TCLYLTC is in accordance with transformer data:
•
•
•
•
Bay control REC670
Commissioning manual
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
Tap change timeout duration - effectively the maximum transformer tap change time,
tTCTimeout, available on the local HMI under Main menu /Settings /IED Settings /
Control /TransformerTapControl(84,⇅) /TCMYLTC(84,⇅):x/TCLYLTC(84,⇅):x /
tTCTimeout
Load tap changer pulse duration - required length of pulse from IED to load tap changer,
tPulseDur, available on the local HMI under Main menu /Settings /IED Settings /
Control /TransformerTapControl(84,⇅) /TCMYLTC(84,⇅):x/TCLYLTC(84,⇅):x /
tPulseDur
Transformer tap range, LowVoltTap and HighVoltTap, available on the local HMI under
Main menu /Settings /IED Settings /Control /TransformerTapControl(84,⇅) /
TCMYLTC(84,⇅):x/TCLYLTC(84,⇅):x /HighVoltTap
Load tap changer code type - method for digital feedback of tap position, CodeType,
available on the local HMI under Main menu /Settings / IED settings /Control /
TransformerTapControl(84,⇅) /TCMYLTC(84,⇅):x/TCLYLTC(84,⇅):x /CodeType
During the installation and commissioning, the behavior of the voltage control
functions for different tests may be governed by a parameter group, available on the
local HMI under Main menu /Settings /IED Settings /Control /
TransformerVoltageControl(90, U↕) /TR1ATCC(90, U↕):x/TR8ATCC(90, U↕||):x.
These parameter settings can cause a Total Block, Automatic Block or Alarm for a
variety of system conditions including over and under voltage, over current and tap
changer failure. It is important to review these settings and confirm the intended
response of the voltage control function for different secondary injection tests.
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) and secondary bus voltage (U
L
Section 11
Testing functionality by secondary injection
) equivalent quantities are
B
169