ABB RER620 Technical Manual page 299

1MAC309294-MB F
RER620
Technical Manual
CBB (rows in the matrix). The Shot number CBB1...CBB7 setting defines which shot is
related to the CBB (columns in the matrix). For example, CBB1 settings are:
• First reclose time = 1.0s
• Init signals CBB1 = 7 (three lowest bits: 000111 = 7)
• Blk signals CBB1 = 16 (the fifth bit: 010000 = 16)
• Shot number CBB1 = 1
CBB2 settings are:
• Second reclose time = 10s
• Init signals CBB2 = 6 (the second and third bits: 000110 = 6)
• Blk signals CBB2 = 16 (the fifth bit: 010000 = 16)
• Shot number CBB2 = 2
CBB3 settings are:
• Third reclose time = 30s
• Init signals CBB3 = 4 (the third bit: 000100 = 4)
• Blk signals CBB3 = 16 (the fifth bit: 010000 = 16)
• Shot number CBB3 = 3
CBB4 settings are:
• Fourth reclose time = 0.5s
• Init signals CBB4 = 8 (the fourth bit: 001000 = 8)
• Blk signals CBB4 = 0 (no blocking signals related to this CBB)
• Shot number CBB4 = 1
If a shot is initiated from the INIT_1 line, only one shot is allowed before lockout. If a
shot is initiated from the INIT_3 line, three shots are allowed before lockout.
A sequence initiation from the INIT_4 line leads to a lockout after two shots. In a
situation where the initiation is made from both the INIT_3 and INIT_4 lines, a third
shot is allowed, that is, CBB3 is allowed to start. This is called conditional lockout. If the
initiation is made from the INIT_2 and INIT_3 lines, an immediate lockout occurs.
The INIT_5 line is used for blocking purposes. If the INIT_5 line is active during a
sequence start, the reclose attempt is blocked and the AR function goes to lockout.
If more than one CBBs are started with the shot pointer, the CBB with the
smallest individual number is always selected. For example, if the
INIT_2 and INIT_4 lines are active for the second shot, that is, the shot
pointer is 2, CBB2 is started instead of CBB5.
Even if the initiation signals are not received from the protection functions, the AR
function can be set to continue from the second to the fifth reclose shot. The AR function
can, for example, be requested to automatically continue with the sequence when the
circuit breaker fails to close when requested. In such a case, the AR function issues a
CLOSE_CB command. When the wait close time elapses, that is, the closing of the circuit
breaker fails, the next shot is automatically started. Another example is the embedded
generation on the power line, which can make the synchronism check fail and prevent the
Section 5
Control functions
293