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Appendix-5: Description of UPS and Block Diagram
Name Denition
Q1 Common Mains Supply Circuit Breaker
Q2 Output Circuit Breaker
Q3 Maintenance Bypass Circuit Breaker
Q4 Auxiliary Mains Supply Circuit Breaker
F5 Battery Fast Fuse
Q6 Inrush Circuit Breaker
F1 Rectier Fast Fuse
F2 Inverter Fast Fuse
KREC Rectier Contactor
KINV Inverter Contactor
KBYP Backfeed Contactor
X1 Common Mains Supply Terminals
X2 Output Terminals
X4 Auxiliary Mains Supply Terminals
BYPASS THYRISTOR
In case any inverter fault occurs; Bypass thyristors transfer the supply of the load electronically from inverter to Auxiliary
Mains Supply without any interruption.
RECTIFIER The rectier generates a very constant DC voltage level by drawing current from the input with a power factor close to 1.
INVERTER The inverter generates a very constant AC voltage level at the output by using DC voltage source at the rectier’s output.
BATTERY Supplies the necessary energy when the mains voltage is not available.
T1 OPTIONAL Galvanic Isolation Transformer (Internal for 10-60kVA)
T2 OPTIONAL Galvanic Isolation Transformer for External Maintenance Bypass Line (on request)
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