Surge Protection Rechner

Berechnen Sie SPD energy absorption und clamping voltage requirements for lightning und surge protection.

System Voltage (RMS)

Expected Surge Current

Surge Duration

µs

8/20 microsecond is standard test waveform

Clamping Voltage Ratio

Clamping V / System V peak; typical MOV = 2-3x

Clamping Voltage

813 V

Energy per Surge162.6 J

System Peak Voltage325 V

Peak Surge Power8,132 kW

Clamping Voltage vs Surge Duration

Formel

SPDs must absorb surge energy while limiting voltage to a safe clamping level that protects downstream equipment.

V_clamp = V_peak x Clamping Ratio

Energy = V_clamp x I_surge x Duration

The standard test waveform for SPDs is 8/20 microseconds (8 us rise, 20 us to half-value).

Type 1: Lightning current (10/350 us), installed at service entrance

Type 2: Surge current (8/20 us), at distribution panel

Type 3: Combination wave, at point of use

230 V system, 10 kA surge (8/20 us), MOV clamping ratio 2.5x.

What is an 8/20 microsecond waveform?

A standard test surge that rises to peak in 8 microseconds and decays to half-value in 20 microseconds. It simulates induced lightning surges.

How do I choose between MOV and TVS?

MOVs handle high energy and are used in power systems. TVS diodes have faster response and lower clamping, ideal for sensitive electronics.

How many surges can an SPD handle?

MOV-based SPDs degrade with each surge. Rating should include expected surge count over the device lifetime, with replacement indicators.

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