Three Highlights of Online UPS and Line Interactive UPS (Part One)

In this article, we examine the difference between online and line interactive UPS in three experiments.

1. Time delay switching power supply switch between input power line and battery bank and vice versa (transfer switch delay between normal mode and battery mode)

2. Output voltage stabilization

3. Acceptable input voltage range for online and line interactive UPS

The following training film describes these differences in detail:

The three experiments used two incandescent lamps and two online UPSs and an interactive line with two batteries as well as a transistor.

Off-line UPS is powered by 7-hour internal batteries and online U-ups are powered by external 42-hour batteries. (The difference between the batteries and their type does not affect the test results.)

Trans Varyac is used to change the input range, allowing for simultaneous power outages and observing the difference of the transmission delay time difference for both UPS.

We first turn on Trans Varyac.

The online ups are in auto start mode and will turn on.

We also turn off the offline UPS with the power button and wait for both UPS to go into normal mode, ie use the input power.

First experiment:

Simulate power outage and observe its effect on the output of both UPS:

Because the power transfer mechanism is in the offline UPS using the relays in it when switching from input to battery-inverter, the output of the UPS will be oscillating (so-called flashing).

But in the online UPS there will be no fluctuation due to the bass, 400 volts, and the inverter being operational permanently.

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