# Quick Answer: How Can We Reduce The Inrush Current Of A Transformer?

## How can we reduce the inrush current of a DC motor?

Re: how to reduce inrush current of a DC motor Use a relay to control the motor.

Wire the contacts from the battery directly to the relay to the motor.

Use the BMS output to power the on/off switch and the relay coil.

This way the BMS will shut off the relay when the cells get low..

## How is transformer inrush current calculated?

Transformer Inrush Current: Calculation & TheoryIf the transformer is switched on at the instant of voltage zero, the flux wave is initiated from the same origin as voltage waveform, the value of flux at the end of first half cycle of the voltage waveform can be calculated using:Where φm is the maximum value of the steady-state flux.More items…•

## What is the cause of inrush current?

Inrush current is the instantaneous high input current drawn by a power supply or electrical equipment at turn-on. This arises due to the high initial currents required to charge the capacitors and inductors or transformers. The inrush current is also known as the switch–on surge, or the input surge current.

## How long does inrush current last?

These currents can be as high as 20 times the steady state currents. Even though it only lasts for about 10ms it takes between 30 and 40 cycles for the current to stabilize to the normal operating value.

## What is the difference between inrush current and starting current?

It is the pure resistive current and is governed by the DC resistance of the windings. Starting current is the current drawn for a short time while the machine accelerates up to speed, it is significantly higher that nominal current and can be reduced by using a Star Delta starting relay.

## How can I reduce my inrush current?

Inrush current can be reduced by increasing the voltage rise time on the load capacitance and slowing down the rate at which the capacitors charge. Three different solutions to reduce inrush current are shown below: voltage regulators, discrete components, and integrated load switches.