In this week’s blog we will continue our series about UPS equipment. In the previous post we discussed applications where you will find a UPS being utilized. Today we will discuss the various types of UPSs available. Generally, you will find five different types of UPSs available. Each type offers varying degrees of features and protections.

Offline/Standby
This type of UPS offers a basic set of features and provides surge protection and battery backup. The equipment that is being protected by this type of UPS is internally connected directly to the incoming utility power. The UPS monitors the voltage on the line. When the line voltage dips or rises past a certain level the internal circuitry turns on and provides output power to equipment attached.

Line interactive
This type of UPS is very similar to an offline/standby type of UPS but it includes the use of an autotransformer. Due to the inclusion of an autotransformer this type of UPS can tolerate under-voltage brownouts and overvoltage surges without using the internal battery reserves.

Ferro –resonant
This type of UPS operates very much like a standby UPS. The UPS contains a Ferro-resonant transformer that will act like a filter on the incoming utility power and provides voltage regulation and power conditioning for disturbances such as line noise. The Ferro-resonant transformer contains a reserve of energy to allow for transfer time from the utility to the internal inverter.

Rotary
This type of UPS is generally used in conjunction with a standby generator. These UPS’s use a high mass spinning flywheel for energy storage and provide short-term power typically long enough for the standby generator to switch on. This UPS is typically used in larger application where high current is necessary.

Online Double Conversion – The type of UPS offered by Energy Technologies
This type of UPS is where the batteries and inverter are always on. There is no need for any power transfer switchover like is required on the Standby or line interactive UPS. This type of UPS offers additional power conditioning ability because it is converting the incoming AC voltage to DC voltage and back to AC.   This type of UPS is ideal where electrical isolation is necessary for power equipment that is very sensitive to power fluctuations and cannot tolerate any cycle interruptions. This type of UPS provides what is termed “0” transition and offers the best degree of protection and operation for the equipment connected to the UPS.

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