Rotary UPS

At the heart of a backup power system is a standby diesel generator. Diesel generators have the ability to start and assume a load in less than 10 seconds, making them an ideal choice for industrial or commercial primary and back-up power systems. However, the short break between power failure and engine start is incompatible with computer systems or other power reliant processes means that an uninterruptible power supply is needed to bridge the "gap". Most forms of uninterruptible power supply (UPS) are powered by battery or flywheel energy. Battery powered UPS are called 'static' UPS, since they have no moving parts.

UPS that use energy stored in a flywheel are referred to as 'rotary UPS' (RUPS) due to the rotating mechanism. Rotary UPS that incorporate a diesel engine to provide extended power backup duration are called Diesel Rotary UPS (DRUPS). Both kinds of UPS provide power at the instant mains electricity fails, but the small amount of stored energy they contain makes them suitable for a few seconds or minutes of use only. To get uninterruptible and continuous power supply, a diesel-generator back-up system is needed.

Rotary UPS

Rotary UPS – How Do They Work?

Rotary UPS’ use a series of flywheels which convert electrical energy into kinetic energy and store it within the flywheel. In the event of a power cut, the stored energy is converted back into electrical energy to supply the building load. To protect for prolonged power cuts, our flywheel rotary UPS systems come coupled with a diesel generator, which will automatically start up and take the load before the flywheels fully discharge. Diesel rotary uninterruptible power supply devices (DRUPS) combine the functionality of a battery-powered or flywheel-powered UPS and a diesel generator.

When mains electricity supply fails, stored energy in the flywheel is released to drive the electrical generator, which continues to supply power without interruption. After a short delay, the diesel engine takes over from the flywheel to drive the electrical generator to make the electricity required. A DRUPS will have enough fuel to power the load for days or even weeks in the event of failure of the mains electricity supply. Rotary UPS that do not incorporate a diesel engine on the same skid mount are simply referred to as rotary UPS (RUPS) or flywheel UPS - using the same rotating flywheel for dynamic energy storage, but without a self contained diesel engine to provide continuity power.

Power Protection.pptx

Why Consider A Rotary Solution?

If you have a power conditioning requirement greater than say 100kW in a truly mission-critical application or in a situation where the brand and reputation of your business would be damaged by a loss of service, then serious consideration should be given to the adoption of Rotary UPS technology which delivers high reliability and low maintenance over the long term. If the nature of your connected load demands the highest-quality sinusoidal waveform or you have a downstream requirement for system inertia or fault clearance without having to by-pass to raw mains, then again a Rotary UPS solution would be necessary.

Additionally, if space is constrained, or could be utilised for greater commercial benefit, then consideration should be given to flywheel-based Rotary solutions, either with separate standby generation (RUPS) or integrated generation (DRUPS or DeRUPS).

Reliability And Availability Considerations:

The simple construction of a Rotary UPS and its electrical characteristics make it well suited to large, high-resilient applications where strong technical performance is paramount.
The reliability of a Rotary UPS is typically 10-times that of a static UPS and so the product is suitable for the most mission critical of applications.
The absence of fans and power capacitors eliminates the need for periodic component upgrades and the associated availability and risk implications.
With “human intervention” identified as the cause of outage in a Data Centre, the “fit and forget” advantages of Rotary UPS are evident.

Standby Generator

Commercial Benefits:

• Rotary UPS products typically have a 20-year service life (minimum)

• Minimal major component replacements are required over the lifetime of the product

• Self-ventilation and the elimination of air-conditioning requirements offer indirect savings in Cap-Ex and Op-Ex.

PowerContinuity-Systems-Company-profile.pdf

Power Continuity have supplied and installed rotary UPS systems up to 4MW in size. By offering both static and rotary UPS, as well as diesel generators, we can provide you with the best power protection system personalised to your needs and requirements.