ROTARY UNINTERRUPTIBLE POWER SUPPLIES
Piller Rotary UPS Solutions
The UNIBLOCKT™ UBTD+ Diesel Rotary UPS combines all the benefits of a rotary UPS with a diesel engine in one integrated unit. The system consists of the UNIBLOCK™ motor- generator (MG) connected via a free wheel clutch to a diesel engine, all mounted on a single short base frame. The load is normally fed via an isolating and coupling choke connected to the utility supply. The choke has a second tapped connection to the motor-generator. In the event of short interruptions or complete outages, the load is supported initially by a ride-through source which can be either a conventional battery system or a Piller POWERBRIDGE™ electrically-coupled kinetic energy store – alternatives unique to the Piller design and providing the longest ride-through times available in the market. With the load safely supported, the diesel engine is then given a command to start. Once up to speed, the system hands over the long-term support of the load to the engine by seamlessly engaging the clutch.
The UNIBLOCK™ Motor-Generator
At the heart of every Piller rotary UPS lies the pre-eminent UNIBLOCK™ synchronous motor- generator with its unique low-distortion, high fault-clearing characteristics.
The UNIBLOCK™ machine’s motor and generator windings share a common stator and a single brushless rotor to provide a highly compact double winding machine with unique electrical characteristics. The combination of special electric steel and combined stator windings gives rise to a machine with exceptionally high efficiency whilst exhibiting the sub-transient reactance required for low harmonic distortion and high fault clearing capacity. An incorporated damper cage reduces harmonics and the standard bearing design ensures long operational performance with minimal maintenance. The machine is manufactured and balanced by hand at the Piller factory to ensure extremely long service life.
A design free of power capacitors eliminates the common failure component generally found in static UPSs. The durable rotary machine technology is far less sensitive to damage from overload and other electrical disturbances and uses no brushes, slip rings or complex bearing arrangements.
The power electronics employ rugged semi- conductor technology with no need for internal device paralleling or multiple power capacitors. Bypass operation is not required for any aspect of the UPS function and in most cases, electric cooling fans are eliminated by using the impeller of the UNIBLOCK™ machine for the system cooling. All of these factors combine to provide a UPS which exhibits a level of reliability that cannot be matched by other technologies.