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
Start duration
and
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
Time left to operate
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
Operate time
and in Monitored data
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
in
Table 635
.
Table 635: Binary to decimal conversion of the
Started timers
and
Operated timers
in Recorded data
Timer notation Timer1 Timer2 Timer3 Timer4
Timer description Touch voltage/fault
current estimation
module
Cross-country earth-
fault module
Switch onto fault
(SOTF) module
Intermittent earth fault
module
Binary (0 or 1)
0=not started/not op-
erated,
1=started/operated
0 or 1 0 or 1 0 or 1 0 or 1
Started/Operated timers
(integer): Timer1·2
0
+ Timer2·2
1
+ Timer3·2
2
+ Timer4·2
3
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:
Started timers
1+8 = 9 and
Operated
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
Blocking mode
.
The
Blocking mode
setting has three blocking methods. In the “Freeze timer” mode,
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”.
Protection functions
1MRS759142 F
636 REX640
Technical Manual
To Next Page
Loading...
