ABB RELION REX640, Техническое руководство, Страница: 1670 / 1960

•
Shot number CBB1 = 1
CBB2 settings are:
•
Second reclose time = 10s
•
Init signals CBB2 = 6 (the second and third bits: 011000 = 6)
•
Blk signals CBB2 = 16 (the fifth bit: 000010 = 16)
•
Shot number CBB2 = 2
CBB3 settings are:
•
Third reclose time = 30s
•
Init signals CBB3 = 4 (the third bit: 001000 = 4)
•
Blk signals CBB3 = 16 (the fifth bit: 000010 = 16)
•
Shot number CBB3 = 3
CBB4 settings are:
•
Fourth reclose time = 0.5s
•
Init signals CBB4 = 8 (the fourth bit: 000100 = 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 reclosing. If the autoreclose sequence is
continued to the second shot, a successful synchronous reclosing is more likely than
with the first shot, since the second shot lasts longer than the first one.
Control functions 1MRS759142 F
1670 REX640
Technical Manual