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3.5 Metering Function
The GRT100 performs continuous measurement of the analogue input quantities. The
measurement data shown below are displayed on the LCD of the relay front panel or on the local
or remote PC.
- Magnitude and phase angle of phase current of each winding (I
a1
, I
b1
, I
c1
up to I
a3
, I
b3
, I
c3
)
- Magnitude and phase angle of neutral current of each winding (I
n1
up to I
n3
)
- Magnitude and phase angle of symmetrical component current of each winding (I
11
, I
21
, I
01
up to I
13
, I
23
, I
03
)
- Magnitude and phase angle of phase-to-phase voltage (V)
- Magnitude of phase differential current (I
da,
I
db,
I
dc
)
- Magnitude of residual differential current for REF protection (I
d01
up to I
d03
)
- Percentage of thermal capacity (THM%)
- Frequency
Phase angles above are expressed taking that of positive sequence voltage as a reference phase
angle, where leading phase angles are expressed as positive values.
The above system quantities are displayed in values on the primary side or on the secondary side
of the CT according to a setting. To display accurate values, it is necessary to set the CT ratio and
VT ratio too. For the setting method, see "Setting the transformer parameters" in 4.2.6.7.