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LayerZero's Patented Algorithm Eliminates Transformer Inrush

In many products used in the power distribution industry, when a transformer is initially connected to a source of AC voltage, a substantial surge of current called Transformer Inrush may occur. During out of phase STS transfers, a transient current larger than the transformer current can flow for several cycles, potentially resulting in circuit breaker trips and loss of critical load.

Our exclusive Dynamic Phase Compensation technology helps protect upstream sources and downstream critical loads from transformer inrush currents by constantly monitoring the power and introducing an appropriate delay in switching. This delay significantly reduces inrush currents for out-of-phase transfers, preventing upstream tripping, and eliminating potential UPS overload.

LayerZero’s Dynamic Phase Compensated Transfer eliminates this inrush seen in traditional STS. Sample waveform captures with the phase angle at 30° through 180° are shown below. It is important to note that:

1. there is no inrush (current excursion) in the Output Amps waveform; and

2. the output voltage (critical load voltage) is within the CBEMA/ITIC bounds (maximum allowable outage = 20 milliseconds). Phase difference greater than 180° yields a longer transfer time; but well within the bounds prescribed by CBEMA/ITIC.


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