7.10.6
Monitored data
Table 149:
ZGVPDIS Monitored data
Name
Type
Values (Range)
Unit
Description
UL1
REAL
-
kV
Voltage in phase L1
UL2
REAL
-
kV
Voltage in phase L2
UL3
REAL
-
kV
Voltage in phase L3
IL1
REAL
-
A
Current in phase L1
IL2
REAL
-
A
Current in phase L2
IL3
REAL
-
A
Current in phase L3
7.10.7
Operation principle
The full scheme backup distance element constitutes of three operating zones. Zone1
has only the phase-to-phase loops enabled. Zone2 and zone3 can be selected for phase
–to-phase or Enhanced reach loop. Each measuring loop use the offset mho
characteristic
The base value of impedance can be calculated according to equation
3
UBase
ZBase
IBase
=
IECEQUATION1400024 V1 EN
(Equation 53)
Where,
ZBase
is the base value of impedance
UBase
is the line-to-line voltage rating at the generator terminal
IBase
is the line current rating at the generator terminal
The minimum operating current is provided using the setting
IMinOp
.
All the outputs will be blocked by activation of the BLOCK or BLKZ input.
Offset mho characteristic
ZGVPDIS consists of three distance elements operated for three zones separately.
Each zone consists of measuring loops which uses self-polarized offset mho
characteristics with both forward and reverse reach settings for the detection of the
fault in the respective zone. The operating characteristics of all the three zones are
shown in Figure
. The
ImpedanceAngle
setting is common to all three zones.
Section 7
1MRK502052-UEN B
Impedance protection
322
Technical manual
Содержание Relion REG670
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