Ac supply system

Claim 3

An AC current supply system comprising, in combination: a plurality of current supply assemblies connected in parallel via individual energy storage devices to a common load; means for synchronizing said current supply assemblies with a standby AC main; first normally closed switch means for individually connecting said current supply assemblies to said load; second normally open switch means for connecting said load to said standby AC main; and control means responsive to the malfunctionings of one of said current supply assemblies for: load to said standby AC main; b. disconnecting said malfunctioning current supply assembly from said load by opening the respective one of said first switch means; c. adjusting the properly functioning current supply assemblies to provide the total power output supplied by said system prior to the malfunction; and then d. disconnecting said load from said standby AC main by opening said second switch means, whereby said AC supply system then again supplies the entire power required by said load and the voltage stability of the system is maintained during the time required to remove the malfunctioning assembly from the system.

Claim 4

An AC current supply system comprising, in combination: a plurality of current supply assemblies connected in parallel via individual energy storage devices to a common load; means for synchronizing said current supply assemblies with a standby AC main; first normally closed switch means for individually connecting said current supply assemblies to said load; second normally open switch means for connecting said load to said standby AC main; and control means responsive to the malfunctionings of one of said current supply assemblies for: load to said standby AC main; b. disconnecting said malfunctioning current supply assembly from said load by opening the respective one of said first switch means; c. adjusting the properly functioning current supply assemblies to provide the total power output supplied by said system prior to the malfunction; and then d. disconnecting said load from said standby AC main by opening said second switch means, whereby said AC supply system then again supplies the entire power required by said load and the voltage stability of the system is maintained during the time required to remove the malfunctioning assembly from the system.

Claim 5

The AC supply system as defined in claim 2 wherein said second switch means comprises a plurality of individual switches, one for each of said current supply means, each of which is connected between the common output to said current supply assemblies and said standby AC main.

Claim 6

The AC supply system as defined in claim 2 wherein said control means responds to internal malfunctions of said current supply assemblies.

Claim 7

The AC supply system as defined in claim 2 wherein said control means responds to voltage drops and/or excess voltages at the inputs of said current supply assemblies.

Claim 8

The AC supply system as defined in claim 2 wherein said current supply assemblies are single phase static inverters containing thyristors, bipolar thyristors or transistors. 7. The AC supply system as defined in claim 2 wherein said current supply assemblies are three phase static inverters containing thyristors, bipolar thyristors or transistors.

Claim 9

The AC supply system as defined in claim 2 wherein said current supply assemblies are static inverters, and wherein said synchronizing means synchronizes said current supply assemblies with the said AC main via the control device for said static inverters.

Claim 10

The AC supply system as defined in claim 8 wherein all of said static inverters are controlled by a central control device.