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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.
7.1.7
Technical data
Table 55:
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
/phase
Timers
(0.000-60.000) s
± 0.5% ± 10 ms
Minimum operate current
(5-30)% of IBase
± 1.0% of I
n
7.2
Underimpedance protection for generators and
transformers ZGCPDIS (21G)
7.2.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Underimpedance protection for
generators and transformers
ZGCPDIS
21G
7.2.2
Functionality
The underimpedance protection for generators and transformers ZGCPDIS(21G), has the
offset mho characteristic as a three zone back-up protection for detection of phase-to-
phase short circuits in transformers and generators. The full scheme three zones have
independent measuring phase-to-phase loops and settings that gives high flexibility for all
types of applications.
1MRK 502 048-UUS A
Section 7
Impedance protection
159
Technical manual
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