10 350 μs Current Wave Meaning

Based on dipole theory electromagnetic field equations are calculated.

10 350 μs current wave meaning. The iec ieee 8 20 us waveform is an approximation of the surge current waveform experienced for induced lightning effects. Type surge protection devices are classified into types according to their discharge capacity. Protects equipment connected to it and is characterized by an 8 20 μs current wave. It is not intended that this waveshape be used to characterize the protection level of an spd.

The 10 350 μs impulse current wave which is generated by impulse current generator in the laboratory is simulated by heidler function current model. The iec ieee 10 350 us microsecond waveform is an approximation of the surge current waveform experienced for a primary lightning strike. Iec 62305 theory holds that the wave shape of lightning currents that hit zone zero can only be represented by a 10 350 waveform. Impulse current waveform used for testing i imp the impulse current i imp is defined by a peak current i and a charge q and tested in accordance with the test parameters set out in the standard annex c it is used to test lightning conductors that are subject to a direct lightning strike.

Type 3 these spds have a low discharge capacity. 2 types of current wave are considered by the iec standards. The 8 20 waveshape is used for this purpose. Type 2 spd the type 2 spd is the main protection system for all low voltage electrical installations.

Type 2 spd is characterized by an 8 20 µs current wave. Combined with heidler function current model electromagnetic field time space distribution of 10 350 μs impulse current wave is simulated. The 10 350 waveshape is used within iec standards when a conductor or spd is expected to carry direct or partial lightning currents. They must therefore only be installed as a supplement to type 2 spd and in the vicinity of sensitive loads and are characterised by a combination of voltage waves 1 2 50 μs and current waves 8 20 μs.

To characterize the current waves from a direct lightning stroke see fig. Analysis of the phenomena allows definition of the types of lightning current and voltage waves. It further holds that only spds tested with that waveform can be installed at the borders between zone 0 and zone 1. Type 1 spd is characterized by a 10 350 µs current wave.

100 ka 10 350 μs wave. J9 10 350 µs current wave. Installed in each electrical switchboard it prevents the spread of overvoltages in the electrical installations and protects the loads. Iimp impulse current of 10 350 μs waveform associated with type 1 spd s in surge current of 8 20 μs waveform associated with type 2 spd s up the residual voltage that is measured across the terminal of the spd when in is applied.

Discharge current i max surge current 8 20 µs current impulse only für spd type 2 combination wave u.