Secondary Test - ABB ret650 Commissioning Manual

1MRK 504 126-UEN -
6.7.1.1
Commissioning Manual
• Tap change timeout duration - effectively the maximum transformer tap
change time, tTCTimeout, available on the local HMI under Main menu/
Settings/IED Settings/Control/TCMYLTC (84)/1:TCMYLTC/
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/TCMYLTC (84)/1:TCMYLTC/
tPulseDur.
• Transformer tap range, LowVoltTap and HighVoltTap, available on the
local HMI under Main menu/Settings/IED Settings/Control/
TCMYLTC (84)/1:TCMYLTC/LowVoltTap and Main menu/
Settings/IED Settings/Control/TCMYLTC (84)/1:TCMYLTC/
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/TCMYLTC (84)/1:TCMYLTC/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/TR8ATCC/1:TR8ATCC/
General. 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.
Terminology
The busbar voltage UB is a shorter notation for the measured voltages Ua, Ub, Uc
or Uij, where Uij is the phase-phase voltage, Uij = Ui -Uj, or Ui, where Ui is one
single-phase-to-earth voltage.
I is a shorter notation for the measured load current; it is to be used instead of the
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three-phase quantities Ia, Ib, Ic or the two-phase quantities Ii and Ij, or single-phase
current Ii.
Also note that for simplicity local HMI menu structures included in the following
procedure are referred to universally as TR8ATCC, for example, Main menu/
Settings/IED Settings/Control/TR8ATCC/1:TR8ATCC/Time/t1.

Secondary test

The voltage control function performs basic voltage regulation by comparing a
calculated load voltage (U
(with upper and lower limits U2 and U1 respectively). The calculated load voltage
) against a voltage range defined by setting UDeadband
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Section 6
Testing functionality
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