ABB RET670 Commissioning Manual

• Automatic transformer voltage control
Main menu/Settings/Setting Group N/Control/
TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC:x/General/
Operation
• Enable Tap Command
Main menu/Settings/General settings/Control/
TransformerTapChanger(YLTC,84)/TCMYLTC:x/TCLYLTC:x/
EnabTapCmd
While the test set is connected to the IED but no voltage is applied, the voltage
control functions will detect an undervoltage condition that may result in an alarm
or blocking of the voltage-control operation. These conditions will be shown on the
local HMI.
2. Apply the corresponding voltage
Confirm the analog measuring mode prior to undertaking secondary injection
(positive sequence, phase-to-phase, or phase-to-ground). This measuring mode is
defined in the local HMI under Main menu/Settings/Setting Group N/Control/
TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC:x/General/
MeasMode
The application of nominal voltage VSet according to set MeasMode to the IEDs
should cause the alarm or blocking condition for undervoltage to reset.
11.10.3.3 Check the normal voltage regulation function
1. Review the settings for VDeadband (based on percentage of nominal bus voltage)
and calculate the upper (V2) and lower (V1) voltage regulation limits for which a tap
change command will be issued.
2. Review the expected time for first (t1) and subsequent (t2) tap change commands
from the voltage control function on the local HMI under Main menu/Settings/
Setting Group N/Control/TransformerVoltageControl(ATCC,90)/
TR1ATCC:x/TR8ATCC:x/Time/t1 and t2l
3. Lower the voltage 1% below V1 and wait for the issue of a Raise command from the
voltage control after the expiry of a constant or inverse time delay set by t1.
Detection of this command will involve locating the allocated binary output for a
raise pulse command in the Signal Matrix in PCM600 and monitoring a positive
from this output.
4. After the issue of the raise command, return the applied voltage to VSet (nominal
value).
5. Raise the voltage 1% above the upper deadband limit V2 and wait for the issue of a
lower command from the voltage control after the expiry of a constant or inverse
time delay set by t1. Detection of this command will involve locating the allocated
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
250 Transformer protection RET670 2.2 ANSI
Commissioning manual

ABB RET670 Specifications

General

Rated Frequency	50/60 Hz
Inputs	Analog and binary inputs
Application	Protection of power systems
Communication Protocols	IEC 61850, DNP3, Modbus
Operating Temperature Range	-25°C to +55°C
Mounting	Rack mounted
Number of Binary Inputs	Up to 48
Number of Binary Outputs	32
Protection Functions	Overcurrent Protection
Outputs	Binary outputs
Enclosure	IP 54
Type	Line Differential Protection
Number of Analog Inputs	24