ABB Relion REC670, Applications Manual

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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
SEMOD158732-1 v2
14.5.1 Identification
SEMOD173054-2 v5
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Automatic voltage control for tap
changer, single control
TR1ATCC
U
IEC10000165 V1 EN-US
90
Automatic voltage control for tap
changer, parallel control
TR8ATCC
U
IEC10000166 V1 EN-US
90
Tap changer control and supervision, 6
binary inputs
TCMYLTC - 84
Tap changer control and supervision,
32 binary inputs
TCLYLTC - 84
14.5.2 Application
SEMOD159067-1 v2
SEMOD159053-5 v5
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
1MRK 511 401-UUS A
Section 14
Control
Bay control REC670 2.2 ANSI 407
Application manual