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Closed Transition ATSs John J. Stark Marketing Services Coordinator, Russelectric Inc.

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Presentation on theme: "Closed Transition ATSs John J. Stark Marketing Services Coordinator, Russelectric Inc."— Presentation transcript:

1 Closed Transition ATSs John J. Stark Marketing Services Coordinator, Russelectric Inc.

2 Why Operate in Parallel with the Utility? Closed Transition Transfer of non-utility generator, re-transfer and generator testClosed Transition Transfer of non-utility generator, re-transfer and generator test CogenerationCogeneration Peak ShavingPeak Shaving Curtailable Rate StructureCurtailable Rate Structure Distributed GenerationDistributed Generation

3 Types of Operational Modes Open Transition Open Transition Closed Transition Closed Transition

4 First lets talk about open transition mode An open transition mode of operation is a method of transferring a load between two sources with an interruption of power during An open transition mode of operation is a method of transferring a load between two sources with an interruption of power duringtransfer.

5 N E L L N E The load source is disconnected for an adjustable period to allow regenerative power to decay Motor #1 drives the normal source contacts Open. M1 Motor #2 then drives the emergency source contacts closed M2 N E L This is all done with very reliable mechanical interlocking and does not require an elaborate electrical interlocking design. Open transition ATS

6 Closed Transition Mode A closed transition mode of operation is a method of either: 1) Transferring a facilitys load between the utility and generator or 2) operating a generator in continuous parallel with the utility service, without an interruption of service.

7 Utility Concerns Reliability and quality of utility power to other customersReliability and quality of utility power to other customers Safety and protection of utility service personnelSafety and protection of utility service personnel Protection of utility equipmentProtection of utility equipment

8 Type of Parallel Operation Passive Momentary utility parallel operationPassive Momentary utility parallel operation –100ms or less

9 Closed Transition Operation L N E The load source is connected to both sources momentarily Operator #1 drives the normal source contacts open Operator #2 drives the emergency source contacts closed L N E L N E S2 S1 Closed transition ATS

10 Closed Transition Transfer Switches Advantages No interruption of power for load test andNo interruption of power for load test andNo interruption of power for load test andNo interruption of power for load test and return to utility as well as peak shave operation return to utility as well as peak shave operation Fast transfer operationFast transfer operationFast transfer operationFast transfer operation

11 Closed Transition Transfer Switches Disadvantages No phase lock synchronizingNo phase lock synchronizing No Protective relaysNo Protective relays No mechanical interlock, thus no safe manual operationNo mechanical interlock, thus no safe manual operation Lacks true load test functionLacks true load test function Higher fault current requirementsHigher fault current requirements

12 Full 3-Phase over and under voltage and frequency sensing on both normal and emergency sources. Protection against running over 100 msecs: Signals to operators Fail to Transfer Function Provides trip signals to the generator or utility breakers. Sophisticated Controls and Safety Features

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