Technical Data - ABB Relion Technical Manual

1MRK 502 048-UUS A
7.1.7
7.2
7.2.1
7.2.2
Technical manual
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.

Technical data

Table 55: ZMRPSB (68) technical data
Function
Reactive reach
Resistive reach
Timers
Minimum operate current
Underimpedance protection for generators and
transformers ZGCPDIS (21G)
Identification
Function description
Underimpedance protection for
generators and transformers
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.
Range or value
(0.10-3000.00) W/phase
(0.10–1000.00) W/phase
(0.000-60.000) s
(5-30)% of IBase
IEC 61850 IEC 60617
identification identification
ZGCPDIS
Section 7
Impedance protection
Accuracy
± 2.0% static accuracy
Conditions:
Voltage range: (0.1-1.1) x V
Current range: (0.5-30) x I
n
Angle: at 0 degrees and 85
degrees
± 0.5% ± 10 ms
± 1.0% of I
n
ANSI/IEEE C37.2
device number
21G
n
159