Auto sysnchronization , Exercises of Electric Machines

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KALOL INSTITUTE & RESEARCH CENTRE,

KALOL

Automatic Synchronization

Prepared By : Jadav Pradipsinh Ramsinh [140260707003] Branch : M.E – Power System ( st Semester) Guide By : Prof. Ankit Gajjar

 (^) What is done in automatic synchronizing system? The automatic synchronizing system compares the reference voltage of the bus on one side of the breaker to the input voltage supplied to the relay from the other side of the breaker.  (^) Why the automatic synchronization is used? To monitor the manual synchronization process, automatic synchronizing system is used in the field.

 Single line diagram of the automatic synchronizing

system :

Here,  (^) When mains are healthy, both the DG’s remains in standby mode.

 When main fails, Line Voltage Monitor (L.V. M) senses. Starting

pulses are given to the Master D.G Set. (Here, Master D.G. Set is automatically selected by programmer.)  (^) After satisfactory starting of the D.G. Set-1, Voltage is sensed by Generator Voltage Monitor (G. V. M). If voltage is healthy, then closing signal is given to D.G-1 breaker and is closed.  (^) Synchronizing Panel gives corresponding pulses to start load automatically.

 (^) Since sharing is proportional to their respective capacities, even D.G sets of the different capacities can be synchronized successfully.  (^) D.G sets continue to run in Synchronization until the load is above 80% of any one D.G set.  (^) When load comes below 80% of any one D.G, the breaker of the second D.G is opened. Now, one D.G is taking the load.  (^) The second D.G is then stopped after its cooling period.

 (^) When mains are resumed, then load is transferred to the mains & both the D.G sets are stopped after their cooling period.  (^) The load Automatic operation has a manual override. In manual mode, the total operation can be performed manually.

 References :

1. Bhavesh Bhalija, R. P. Maheshwari and N.G. Chothani,

“Protection and Switching ,” Oxford University Press, New

Delhi, India, 2011

2. The NRECA Guide to IEEE 1547, 2006. Application guide for

distributed generation interconnection

Thank You…