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As the transformer rating depends on cooling system and better cooling system gives higher rating of transformer.Heat caused by the losses occurred in the transformer and losses depends on both voltage and current as the losses depends on both but not depends on power factor,so transformer rated in KVA.
In UPS, static switch is an electronic switch used to bypass a mechanical switch. Normally used when loads are switched from inverter to mains. Static switch is an automatic switch that can only be activated depending on the condition of the UPS. The following are the conditions wherein the UPS static switch can be activated:
1. Overload condition
2. Failure of inverter
3. Availability of UPS by-pass supply but absence of UPS rectifier supply (normal UPS power) that ran out its battery.
4. Manual intervention on the UPS that resulted to the activation of static bypass switch.
The function of a static switch in the UPS is to provide an automatic transfer from the output of the inverter to an alternate or backup source in the event of an overload or fault on the UPS output. An overcurrent transfer circuit is included in the static switch for this purpose.
Regards
Hassan Qutb
the static switch is automatic switch in on line UPS with inverter and activated in overload or failer of inverter or bybass the power or manual inverteration
