ZOTUP IN PILLS | GUIDE TO CHOOSING THE BEST SPD FOR A PHOTOVOLTAIC PLANT

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Protecting photovoltaic systems is essential to ensure their reliability and longevity in the increasingly critical environmental context in which they operate. Surge protection devices (SPDs) play a crucial role in this process. However, choosing the right SPD can be complex. Here's what to consider:

1. Exposure to Direct and/or Induced Discharges

a) If the installation is exposed to both types of transients (AC and DC), Class I/II Test SPDs are required. For direct discharges on the DC side, models like ZOTUPLIMITER L 13/60 PV Y ... (code 216 106 and code 216 110) are recommended. For the AC side, models like ZOTUPLIMITER L 13/40 230 ff 3+1 and L 13/40 230 ff 1+1 (code 204 141 and 204 121) are suitable.

b) If the transient is only an induced discharge, Class II Test SPDs like ZOTUPLIMITER L 3/30 230 ff 1+1 (code 200 121) are appropriate.

2. String Voltage and DC Continuous Current

The selection of the SPD also depends on the string voltage. By using the formula UCPV ≥ VOC STC x K x N, you can determine the string voltage (UCPV) based on the open-circuit voltage of the photovoltaic module (VOC STC), the voltage compensation coefficient (K), and the number of modules in series in each string (N).

For example, if you have a string with 20 photovoltaic modules and an open-circuit voltage of 30 volts per module, you get a string voltage of 720 volts. In this case, an SPD with a maximum continuous voltage of 1000 V (like code 210 110 for indirect discharges or code 216 110 for direct/indirect discharges) would be an appropriate choice.

Always make sure to select the SPD that best fits the specifications of the photovoltaic system to ensure optimal protection and longevity.

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Suggested by Eng. F.M.M.