ABB RET670 Installation And Commissioning Manual

1. Confirm Transformer Tap Control = On and Transformer Voltage Control =
On
•
Direct tap change control
Main menu/Settings/Setting Group N/Control/
TransformerTapChanger(YLTC,84)/TCMx/TCLx/Operation
• Automatic transformer voltage control
Main menu/Settings/Setting Group N/Control/
TransformerVoltageControl(ATCC,90)/VCSx/VCPx/General/Operation
• Enable Tap Command
Main menu/Settings/General settings/Control/
TransformerTapChanger(YLTC,84)/TCMx/TCLx/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-phase, or phase-earth). This measuring mode is
defined in the local HMI under Main menu/Settings/Setting Group N/
Control/TransformerVoltageControl(ATCC,90)/VCSx/VCPx/General/
MeasMode
The application of nominal voltage USet according to set MeasMode to the
IEDs should cause the alarm or blocking condition for undervoltage to reset.
13.11.4.3 Check the normal voltage regulation function
1. Review the settings for UDeadband (based on percentage of nominal bus
voltage) and calculate the upper (U2) and lower (U1) 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)/VCSx/VCPx/Time/t1 and t2l
3. Lower the voltage 1% below U1 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 USet
(nominal value).
5. Raise the voltage 1% above the upper deadband limit U2 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
1MRK 504 088-UEN C Section 13
Verifying settings by secondary injection
185
Installation and 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