Operating And Inhibit Conditions; Technical Data; Underimpedance Protection For Generators And Transformers Zgcpdis; Identification - ABB RET650 Technical Manual

Section 7
Impedance protection
7.1.6.5
7.1.7
7.2
7.2.1
130

Operating and inhibit conditions

Figure 53 presents a simplified logic diagram for the Power swing detection function
ZMRPSB.
The load encroachment characteristic can be switched off by setting the parameter
OperationLdCh = Off, but notice that the DFw and DRv will still be calculated from
RLdOutFw and RLdOutRv. The characteristic will in this case be only quadrilateral.
There are three different ways to form the internal INHIBIT signal:
• Logical 1 on functional input BLOCK inhibits the output START 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 BLKI01 functional input.
• The INHIBIT internal signal is activated after the time delay, set on tR1 timer, if
an earth-fault appears during the power swing (input IOCHECK is high) and the
power swing has been detected before the earth-fault (activation of the signal
I0CHECK). It is possible to disable this condition by connecting the logical 1
signal to the BLKI02 functional input.

Technical data

Table 54: ZMRPSB technical data
Function
Reactive reach
Resistive reach
Timers
Minimum operate current
Underimpedance protection for generators and
transformers ZGCPDIS

Identification

Function description
Underimpedance protection for
generators and transformers
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
1MRK 504 135-UEN A
Accuracy
± 2.0% static accuracy
Conditions:
Voltage range: (0.1-1.1) x U
r
Current range: (0.5-30) x I
r
Angle: at 0 degrees and 85
degrees
± 0.5% ± 10 ms
± 1.0% of I
r
ANSI/IEEE C37.2
device number
21G
Technical manual