AVR of alternator requires a droop CT.
In alternators of generators the voltage are drooping by increasing of load to the generators.
The AVR is working to increase or decrease the voltage to the normal voltage set to it
Normally the CT is nly done in one phase of winding
Droop CT, also called QDCT (Quadrature Droop Current Transformer), is used for the control of sharing of reactive power (VAR) between parallel connected generators. When generators run in parallel, it shares the real power (KW) as well as the reactive power (VAR). The sharing of real power is controlled by the prime mover governor, while the sharing of reactive power is controlled by the AVR (Automatic Voltage Regulator). In addition to voltage input, the AVR requires the current input for controlling the reactive power. So, the secondary of the quadrature Droop CT is connected to the AVR for providing the power factor dependent signal to the AVR.
The droop CT is not required during the synchronization but it is required for the parallel operation of the generator(s) after the synchronization is completed.
- MS
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Droop CT
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