Abnormal Residual Current

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The insulation impedance of the input (DC) side to PE (Protective Earth) decreases while the SUN2000 is operating. This indicates a potential insulation breakdown or ground fault on the PV side, posing a safety risk.

• The insulation impedance of the input side to PE decreases when the SUN2000 is operating.
• The external power cable may be abnormal temporarily.

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1. 1

   Check whether the impedance of the PV string to ground is excessively low.