7.15.6 Monitored data
PID-3587-MONITOREDDATA v7
Table 202: ZGVPDIS (21) Monitored data
Name Type Values (Range) Unit Description
VA REAL - kV Voltage in phase A
VB REAL - kV Voltage in phase B
VC REAL - kV Voltage in phase C
IA REAL - A Current in phase A
IB REAL - A Current in phase B
IC REAL - A Current in phase C
7.15.7 Operation principle
GUID-DB4C0FEC-2D34-42AA-A105-E30B00CE1B7E v3
The reach values for all the zones are set in percentage of impedance base value. The impedance
base value is calculated using the generator current and voltage ratings.
The base value of impedance can be calculated according to equation
115.
ANSIEQUATION1400024 V1 EN-US (Equation 115)
Where,
ZBase
is the base value of impedance
VBase
is the line-to-line voltage rating at the generator terminal
IBase
is the line current rating at the generator terminal
The minimum trip 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
235. The
ImpedanceAngle
setting is common to all three zones.
Section 7 1MRK 502 066-UUS B
Impedance protection
436
Technical manual
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