Appx.3
Insulation Resistance Measurements for Solar Cell Array
Appx. 3 Insulation Resistance
Measurements for Solar Cell
Array
There are two insulation resistance measurements for solar cell arrays.
Characteristics of them are as follows:
Measurement with P-N opened
PV
Ω
measurement of this manual is explained with this measurement.
As solar cell voltage inuences the test voltage, the measurement may not
be accurate. Incorrect procedure may damage the solar panel. If earth fault is
occurred due to earth leakage as shown in the following gure, current being
generated inuences the insulation resistance meter resulting in inaccurate
measurement with a normal insulation resistance meter. PV
Ω
measurement
mode of the IR4053 and IR4055 allows accurate measurements without the
effect from power generation.
P
N
Connection box
PV
Earth
leakage
Earth
PV current
Insulation resistance meter
current reading
Measurement with P-N shorted
This measurement allows accurate measurements but is also a highly
dangerous method as arc discharge may be generated due to the short
circuit. There is also a re risk depending on the deterioration level of the
solar panel.
P
N
Connection box
PV
Earth
1
2
3
4
5
6
7
Appx.
索引
To Next Page
Loading...
