GE FGC TLE Series, Руководство пользователя

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Critical Power
Modifications reserved Page 17/92
GE_UPS_USM_TLE_SUL_M62_1M0_2US_V010.docx User Manual
TLE Series 625 - 750 - 1000 UL S2
4.3 RPA PARALLEL SYSTEM OPERATION
4.3.1 Introduction to the RPA Parallel System
Fig. 4.3.1-1 Block diagram RPA Parallel System operation
Two or more equal power units can be paralleled to increase the output power ( paralleling for capacity )
or to improve the overall reliability of an UPS system ( paralleling for redundancy ).
The outputs of parallel units are connected to a common power bus, and in normal operation the units
connected on the parallel bus share the
Load
equally.
The modular concept of
TLE Series
allows parallel operation of up to 6 units , without using paralleling
switchgear, external bypass circuits or common control circuitry (see
Fig. 4.3.1-1
).
Parallel units for power capacity
Several units can be paralleled in order to achieve output power greater than the maximum power of a
single unit.
The maximum total power shared between the paralleled units is equal to the total installed nominal
power .
In the event of a failure of one unit, the power supplied by the UPS system becomes insufficient and the
Load will be transferred to the Utility Bypass source.
Parallel units for redundancy
The nominal power rating of the n out of n+1 redundant paralleled modules must be equal to or higher
than the required
Load
power.
The
Load
will be equally shared by the n+1 units connected on the output bus.
Should one of the n+1 paralleled units trip Off-line, the remaining (n) modules will supply the Load ,
maintaining conditioned power to the
critical Load
.
From this results higher reliability and security for the Load plus a higher MTBF (Mean Time Between
Failures).