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The micro-grid power system is a world-wide trend for green energy demanding as part of smart-grid, and the most popular solar-cell inverter is possible suffering the surge transient disturbance from connected power system. This study investigates the electromagnetic model establishment for surge transient immunity protection analysis with ANSYS simulation tool. We first verify the simulated output of surge generator meets the waveform requirement for IEC61 000-4-5, and then investigate the possible scheme for circuit protection with proper TVS devices and placement location. We also try to investigate the possible intruding surge monitoring mechanism by analyzing the spectrum characteristics via coupling device for power system alarm implementation.