ABB Relion 670 Series Applications Manual page 365

1MRK 511 401-UUS F
• 989G_OP = 1
• 989G_CL = 0
If, in this case, line voltage supervision is added, then rather than setting 989 to open state,
specify the state of the voltage supervision:
• 989_OP = VOLT_OFF
• 989_CL = VOLT_ON
If there is no voltage supervision, then set the corresponding inputs as follows:
• VOLT_OFF = 1
• VOLT_ON = 0
14.5 Voltage control
14.5.1 Identification
Function description
Automatic voltage control for tap
changer, single control
Automatic voltage control for tap
changer, parallel control
Tap changer control and supervision,
6 binary inputs
Tap changer control and supervision,
32 binary inputs
14.5.2 Application
When the load in a power network is increased the voltage will decrease and vice versa. To
maintain the network voltage at a constant level, power transformers are usually equipped with
on-load tap-changer. This alters the power transformer ratio in a number of predefined steps and
in that way changes the voltage. Each step usually represents a change in voltage of
approximately 0.5-1.7%.
The voltage control function is intended for control of power transformers with a motor driven on-
load tap-changer. The function is designed to regulate the voltage at the secondary side of the
power transformer. The control method is based on a step-by-step principle which means that a
control pulse, one at a time, will be issued to the tap changer mechanism to move it one position
up or down. The length of the control pulse can be set within a wide range to accommodate
Bay control REC670
Application manual
IEC 61850
identification
TR1ATCC
TR8ATCC
TCMYLTC
TCLYLTC
© Copyright 2017 ABB. All rights reserved
IEC 60617 ANSI/IEEE C37.2
identification device number
90
U
IEC10000165 V1 EN-US
90
U
IEC10000166 V1 EN-US
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Section 14
Control
SEMOD158732-1 v3
SEMOD173054-2 v5
SEMOD159067-1 v2
SEMOD159053-5 v5
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