There are four different ways to form the internal INHIBIT signal:
•
Logical 1 on functional input BLOCK inhibits the output PICKUP signal
instantaneously.
•
The INHIBIT internal signal is activated, if the power swing has been detected and
the measured impedance remains within its operate characteristic for the time, which
is longer than the time delay set on
tR2
timer. It is possible to disable this condition
by connecting the logical 1 signal to the BLK_SS functional input.
•
The INHIBIT internal signal is activated after the time delay, set on
tR1
timer, if an
ground-fault appears during the power swing (input IOCHECK is high) and the
power swing has been detected before the ground-fault (activation of the signal
I0CHECK). It is possible to disable this condition by connecting the logical 1 signal
to the BLK_I0 functional input.
•
The INHIBIT logical signals becomes logical 1, if the functional input I0CHECK
appears within the time delay, set on
tGF
timer and the impedance has been seen
within the outer characteristic of ZMRPSB (68) operate characteristic in all three
phases. This function prevents the operation of ZMRPSB (68) function in cases,
when the circuit breaker closes onto persistent single-pole fault after single-pole
autoreclosing dead time, if the initial single-pole fault and single-pole opening of the
circuit breaker causes the power swing in the remaining two phases.
7.1.7
Technical data
Table 82:
ZMRPSB (68) technical data
Function
Range or value
Accuracy
Reactive reach
(0.10-3000.00)
W
/phase
±2.0% static accuracy
Conditions:
Voltage range: (0.1-1.1) x V
n
Current range: (0.5-30) x I
n
Angle: at 0 degrees and 85
degrees
Resistive reach
(0.10–1000.00)
W
/loop
Power swing detection trip time
(0.000-60.000) s
±0.2% or ±10 ms whichever is
greater
Second swing reclaim trip time
(0.000-60.000) s
±0.2% or ±20 ms whichever is
greater
Minimum trip current
(5-30)% of IBase
±1.0% of I
n
Section 7
1MRK 511 365-UUS A
Impedance protection
154
Phasor measurement unit RES670 2.1 ANSI
Technical manual
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