9.4.3.1 Protection signal definition
The
Control line
setting defines which of the initiation signals are protection start
and trip signals and which are not. With this setting, the user can distinguish the
blocking signals from the protection signals. The
Control line
setting is a bit mask,
that is, the lowest bit controls the INIT_1 line and the highest bit the INIT_6 line.
Some example combinations of the
Control line
setting are as follows:
Table 681: Control line setting definition
Control line
setting
INIT_1 INIT_2
DEL_INIT
_2
INIT_3
DEL_INIT
_3
INIT_4
DEL_INIT
_4
INIT_5 INIT_6
0 other other other other other other
1 prot other other other other other
2 other prot other other other other
3 prot prot other other other other
4 other other prot other other other
5 prot other prot other other other
...63 prot prot prot prot prot 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).
9.4.3.2 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.
9.4.3.3 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.
1MRS758755 C
Control functions
REC615 & RER615
Technical Manual
657
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