Zone Coordination - ABB RELION REX640 Technical Manual

1MRS759142 C
9.9.3.2
9.9.3.3
REX640
Technical Manual
Table 1398: Control line setting definition
Control line
INIT_1
setting
0 other
1 prot
2 other
3 prot
4 other
5 prot
...63 prot
prot = protection signal
other = non-protection signal
When the corresponding bit or bits in both the Control line setting and the INIT_X
line are TRUE:
• The CLOSE_CB output is blocked until the protection is reset
• If the INIT_X line defined as the protection signal is activated during the
discrimination time, the AR function goes to lockout
• If the INIT_X line defined as the protection signal stays active longer than the
time set by the Max trip time setting, the AR function goes to lockout (long trip)
• The UNSUC_RECL output is activated after a pre-defined two minutes (alarming
earth-fault).

Zone coordination

Zone coordination is used in the zone sequence between local protection units and
downstream devices. At the falling edge of the INC_SHOTP line, the value of the shot
pointer is increased by one, unless a shot is in progress or the shot pointer already has
the maximum value.
The falling edge of the INC_SHOTP line is not accepted if any of the shots are in
progress.
Master and slave scheme
With the cooperation between the AR units in the same protection relay or between
protection relays, sequential reclosings of two breakers at a line end in a 1½-breaker,
double breaker or ring-bus arrangement can be achieved. One unit is defined as a
master and it executes the reclosing first. If the reclosing is successful and no trip takes
place, the second unit, that is the slave, is released to complete the reclose shot. With
persistent faults, the breaker reclosing is limited to the first breaker.
INIT_2 INIT_3
DEL_INIT_2 DEL_INIT_3
other other
other other
prot other
prot other
other prot
other prot
prot prot
Section 9
Control functions
INIT_4 INIT_5
DEL_INIT_4
other other
other other
other other
other other
other other
other other
prot prot
INIT_6
other
other
other
other
other
other
prot
1505