Detection and Localization of Disconnections in PV Strings using Impedance Testing
Solar PV system disconnection (solar cable fault) can be located within +/- 1 solar panel accuracy using the Z200 PV Analyzer.
The measurement takes about 20 seconds, and it is probably the fastest way to measure the position of a disconnect. With the Z100 and Z200 PV Analyzer equipment, a more systematic approach may be carried out.
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The disconnect test is used to measure the position of a disconnect in a string solar PV modules. The instrument will measure the low frequency impedance of the PV string connected. The condition for a PV system disconnect is a string impedance at low frequencies, with a value higher than 10 kOhm.
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Whenever a string if it is not performing to its specifications, the first step is usually to measure the IMPEDANCE of the solar panel string. If the impedance is very high, say 10 kΩ, the user should suspect a PV disconnect in the system, and refer to the Disconnect application of the Z200 PV Analyzer.
Normally troubleshooting can be time-consuming if individual solar panels needs to be checked, but with the Z200 PV Analyzer it is however possible to measure the position of the PV disconnect directly. Using the Z200 PV Analyzer therefore allows solar PV service providers to save time and money during troubleshooting in the field.