ABB Relion 670 series - Interlocking for Breaker-And-A-Half Diameter BH (3)

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
15.4.9 Interlocking for breaker-and-a-half diameter BH (3)
15.4.9.1 Application
The interlocking for breaker-and-a-half diameter (BH_CONN(3), BH_LINE_A(3),
BH_LINE_B(3)) functions are used for lines connected to a breaker-and-a-half diameter
according to figure
362.
1MRK 506 369-UUS - Section 15
Control
Line distance protection REL670 2.2 ANSI 735
Application manual