Microprocessor based alternator synchronisation

Conditions[ edit ] There are five conditions that must be met before the synchronization process takes place. The source generator or sub-network must have equal line voltagefrequencyphase sequencephase angleand waveform to that of the system to which it is being synchronized. During installation of a generator, careful checks are made to ensure the generator terminals and all control wiring is correct so that the order of phases phase sequence matches the system.

Microprocessor based alternator synchronisation

Under emergency condition such as lowering of frequency or synchronizing of large machines a very fast action is needed, which may not be possible for a human operator. Thus there is a need of autosynchroniser in a power station or in an industrial establishment where generators are employed.

This paper describes a microprocessor based set up for synchronizing a three phase alternator to a busbar. Also existing methods of synchronization are mentioned. To meet the requirement of variable loadeconomically and also for assuring continuity of supply the number of generating units connected to a system busbar are varied suitably.

The connection of an incoming alternator to system bus, ie; synchronization requires fulfillment of the condition like the same phase sequence equality of voltages and frequency between the incoming machine and frequency between the in coming machine and busbar. In order to order to overcome the 9 technical drawbacks of the conventional synchronization methods we can introduce a microprocessor based system.

Synchronizing Lamp The operation of connecting an alternator parallel with another alternator or with a common busbar is known as synchronizing for proper synchronization of alternators the following three conditions must be satisfied 1.

The terminal voltage of incoming machine must be the same as the busbar voltage. The speed of the incoming machine must be same such that the frequency is equal to the busbar frequency.

Microprocessor based alternator synchronisation

The phase of the alternator voltage must be identical to the busbar voltage. It means that the switch must be closed at the instant the two voltages are in correct phase. Condition 1 can be checked with the help of voltmeter, frequency is adjusted by varying the prime mover speed.

In the dark lamp method the lamps are connected across the alternator and busbar terminal. If the phase sequence is different, the lamps will brighten in a cyclic manner correct phase sequence is indicated by simultaneous darkening brightening of lamps.

The switch is closed in the middle of the dark period. Once synchronized properly, the two alternators continues to run in synchronism. The scheme introduced here is for the complete automation of synchronization i. When all the requirements of synchronisation are satisfied, closing of the main switch of the incoming machine is done by the automatic synchronizer CRITERIA OF DESIGN The auto synchronizer has been developed to carry out the following tasks related to the synchronization such as I To check if the phase sequence of incoming machine is correct or otherwise, in case of wrong phase sequence, to terminate the further steps in the process and also to indicate corrective action.

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II To check if frequency of incoming machine is equal to that of busbar and to adjust it to a value nearly equal to the busbar frequency. III to check machine voltage is equal to that of busbar and to adjust it to a value nearly equal to the busbar voltage and IV After ascertaining the fulfillment of the above condition, to give closing signal to the circuit breaker so that the breaker will close the exact inphase instant.

In addition, the auto synchronizer has been designed so that the alternator is started with in minimum voltage and minimum frequency conditions.Tagged Pages: microprocessor based alternator synchronisation, Popular Searches: marathi pdf of alternator, microprocessor based seminars pdf, two rc engine synchronisation, microprocessor based alternator synchronisation gsm module, microprocessor pdf, microcontroller based generator alternator control and monitoring system pdf, two.

synchronization demands a skilled operator and the method is suitable for no load operation or normal frequency condition. under emergency condition such as lowering of frequency or synchronizing of large machines a very fast action is needed, which may not be possible for a human operator.

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Microprocessor based alternator synchronisation

Selection of HV/LV Switchgear, Motor Control Centers. Microprocessor Based Alternator Synchronisation; Surge Current Protection Using Superconductors; Magnetic Levitation;.

Moreover the microprocessor based alternator synchronizer is user friendly and requires less maintenance. It also exploits the advantage of superior performance of the microprocessor like accuracy speed and reliability. Page 1.

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This is the good Electrical project report on Microprocessor Based Automatic Alternator Synchronization and the scheme introduced here is for the complete automation of synchronization i.e. the adjustment of magnitude of voltage and frequency of incoming alternator.

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