Piller
UPS Application Design Guidance 2
Single Output Configuration
Dual Output Isolated Bus Configuration
UNIBLOCK UBTD Diesel UPS - Operation
In normal operation the load is fed via the
coupling choke. The special design of the coupling choke allows a
high level of decoupling between the input and output and blocks all
harmonics and transient events between the input and output.
The coupling choke is tapped with the UNIBLOCK
machine. The generator winding of this synchronous machine ensures
the output voltage is kept constant irrespective of the mains
voltage. The generator winding feeds the loads with the same dynamic
response of an ideal AC supply. Peak currents and high short circuit
current (up to 18 times nominal current) can be supplied by the
UNIBLOCK machine even in the event of a mains failure.
In the event of a mains failure power flows from
the Powerbridge (rotating kinetic energy store) or battery to the
load via the UNIBLOCK machine. If the mains does not return then the
diesel starts and comes up to speed. The overrunning clutch then
closes for a soft start. The load is ramped on to the diesel from
the Powerbridge/battery. The Powerbridge is then fully recharged and
thus enables the full stabilisation function (i.e. the Powerbridge
will stabilise the output frequency during load steps on and off the
diesel by providing power or absorbing power as required).
On restoration of the mains, the output voltage
is synchronised to the mains and the input breaker closes and the
diesel is shut down.
Dual Output Bus Configuration
UNIBLOCK UBTD Diesel UPS - Dual Output Operation
In the basic form the Piller UNIBLOCK UBTD
provides 100% of its available output as continuous Uninterruptible
Power. However, it is available in alternative forms whereby the
power can be split between UPS (Critical Bus) power and Short-Break
power like a standby generator - this form is known as Dual Output
Bus.
Depending upon the particular design
requirements, it is sometimes necessary or desirable to electrically
isolate the short break loads from the Critical Bus - this is known
as Dual Output isolated bus. In this configuration, the generator
winding provides the Critical Bus source and the motor winding of
the UNIBLOCK machine becomes a generator for the Short-Break Bus.
The two circuits are isolated by virtue of the transformer action
between the windings and so the two outputs are electrically
isolated. In other circumstances, it can be preferential to use the
same alternator for both supplies particularly in MV solutions. This
alternative is uniquely available with the UNIBLOCK UBTD system.
Dual Output Bus Medium Voltage Configuration
UNIBLOCK UBTD Module Ratings (Largest Available)
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Piller Static UPS Hybrid Rotary
UPS Diesel Rotary UPS and Static UPS systems
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diesel UPS apotrans static transfer switch dual output
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Technical information associated with:
Piller UK Ltd - UPS Application Design Guidance - Part 1
Technical information associated with:
Piller UK Ltd - UPS Application Design Guidance - Part 3
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