198_TRI-KA – Functions
TRI-KA – Functions_199
Window 4 / 7 – Measurement of the current/voltage
characteristic curve
Before the characteristic curve is measured, the measuring range
is established. While the characteristic curve is measured, the cur-
rent and voltage values currently measured are shown on the
screen and the characteristic curve is drawn. The screen also shows
the irradiation measured by the TRI-SEN. The right value is the av-
erage irradiation established; this is used for STC extrapolation.
If no wireless connection can be established between TRI-KA and
TRI-SEN during measurement of the characteristic curve, the data
are temporarily stored in the TRI-SEN. After the measurement(s),
the data stored in the TRI-SEN must be synchronised with the
TRI-KA (chapter 10.1).
Cable cross-section
> Cross-section of the PV cable
length A
> Length of the cable between the measuring instrument and
the first module of the string
length B
> Length of the cable between the measuring instrument and
the last module of the string
specific resistance
> Specific resistance of the cable used. Exact data are available
on the data sheet of the manufacturer.
standard values
> Copper: 0.01786
Ω
*mm²/m
> Aluminium: 0.02857
Ω
*mm²/m
english
