We have already discuss about parallel operation of alternator/generator and its condition. Also we had described about synchronizing methods of three lamp method. Here we are going to discuss about Synchroscope method || Synchroscope method of Synchronization in parallel operation for a number of generator. For small machine, three lamps method is cheap and good but for large machine in a power system, it is generally processed by using synchroscope which will synchronize automatically by using computer. Phase sequence of alternator is checked at the time of installation. The voltage of incoming machine and busbar is compared and the pointer on it indicates the phase difference between the voltage of busbar and incoming machine.
Operation of Synchroscope method of Synchronization
When the frequency of both incoming alternator and busbar is same, the pointer will be at standstill position. And the movement of pointer gives the information about whether the frequency of incoming machine is high or low which also can be known as the incoming generator is running too fast or slow. The speed of rotation of pointer indicate the difference between the frequency of incoming generator and busbar. Now the phase position and frequency of incoming machine is controlled by adjusting the prime mover input. When the pointer moves slowly (frequency of incoming machine is nearly same to busbar’s frequency) and phase through the zero-phase point (frequency of incoming machine need to higher slightly than busbar because power flow from high voltage to low). After that, the circuit breaker/switches are closed and incoming machine is connected to busbar.
(Note: synchro scope is connected to only one phase so
it only check for a phase i.e. no information about sequence.)
Description of its figure
A simple figure of synchroscope is given below which is just used to understand the operating process of it. There is a pointer which will be fluctuating as frequency of incoming and infinite bus is difference and that fluctuating speed depends on how much the frequency is different. There is "slow" on left and "fast" on right side which mean, the incoming machine's frequency is fast or slow as compared to infinite bus. So that the frequency can be increased or decreased from that information. Hence, it is easy to use as compare to 3 bulb methods.
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