ABB RELION REX640 Technical Manual page 636

Protection functions
The timer calculates the start duration value, which indicates the percentage elapse
of operate timer, 100% means that operate time is completely elapsed and OPERATE
output is activated. The value is available in the Recorded data as
in Monitored data as START_DUR.
Estimate for time left to operate is available in in Monitored data as TIME_TO_OPER
in real time based on fault current or touch voltage magnitude. In the Recorded
data estimate for time left to operate is available as
with assumption that fault current or touch voltage at the triggering moment
(recorded data is triggered with TRIGG_REC input rising edge) will remain the same
until the OPERATE and corresponding OP_EF/OP_XC/OP_SOTF/OP_INTR outputs
would become activated. Furthermore, if OPERATE and corresponding OP_EF/
OP_XC/OP_SOTF/OP_INTR outputs have been activated, the actual operate time of
protection is available in the Recorded data as
as OPERATE_TIME.
Information about started and operated timers are available in Recorded data:
Started timers, Operated timers . This data is binary coded number as illustrated
Table 635
in
Table 635: Binary to decimal conversion of the
Timer notation Timer1
Timer description Touch voltage/fault
current estimation
module
0 or 1
Binary (0 or 1)
0=not started/not op-
erated,
1=started/operated
Started/Operated timers (integer): Timer1·2
Numerical example. If both Touch voltage/fault current estimation module timer
(+1) and intermittent timer (+8) have been started but only Touch voltage
estimation module timer have operated, then:
timers = 1.
Blocking logic
There are three operation modes in the blocking function. The operation modes
are controlled by the BLOCK input and the global setting in Configuration >
System > Blocking mode which selects the blocking mode. The BLOCK input can
be controlled by a binary input, a horizontal communication input or an internal
signal in protection configuration. The influence of the BLOCK input signal activation
is preselected with the global setting
The
the operation timer is frozen to the prevailing value, but the operate outputs are not
deactivated when blocking is activated. In the "Block all" mode, the whole function
is blocked, and the timers and pre-fault phasor buffers are reset. In the "Block
OPERATE output" mode, only the operate outputs are blocked.
Recorded data
The required information for later fault analysis is recorded when the recording
function of IFPTOC function is triggered by activating TRIGG_REC input or writing
to the corresponding DO "LD0.IF1RFRC1.RcdTrg.Oper.ctlVal".
636
.
Timer2
Cross-country earth-
fault module
0 or 1
Blocking mode setting has three blocking methods. In the "Freeze timer" mode,
Operate time and in Monitored data
Started timers and Operated timers in Recorded data
Timer3
Switch onto fault
(SOTF) module
0 or 1
0
+ Timer2·2
Started timers 1+8 = 9 and Operated
Blocking mode .
1MRS759142 F
Start duration and
Time left to operate
Timer4
Intermittent earth fault
module
0 or 1
1 2
+ Timer3·2 + Timer4·2
Technical Manual
3
REX640