Sepac - Model RAV 1101- 1111 - Static Digital Excitation System
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The RAV 1101/1111 static excitation system is designed to operate with Generators ranging from a few Mega Watts up to 600MW regardless of the rotor's characteristic (Brushless or direct excitation type).
Products Details
The system basically consists on an excitation transformer that is connected to the Generator's output, an enclosure with the regulation electronics, the Power Converter or Stack, the ancillary CTs and PTs for metering and the Remote Logic Control.
The excitation transformer, feeds the RAV 1101/1111 through the Generator's voltage terminals, as shown on the Block Diagram.
The transformer's secondary voltage is specified to achieve the maximum voltage specified by the Power Stacks that correspond to the top admissible voltage according to the Generator's characteristics.
The RAV 1101 / 1111 is comprised of several functional modules that work together to perform the following tasks in a coordinated manner:
- Unit start-up, excitation of the generator using the utilitys batteries, adjusting the generator´s voltage to nominal value in a minimum amount of time in a controlled manner.
- In normal operation, it rectifies excitation transformer´s voltage to apply it to the generator´s rotor and control the output power (automatic channel) or excitation current (manual channel).
- Maintain the generator´s voltage within the limits of normal operation controlling excitation and without exceeding the generator´s capability limits.
- Stabilize dynamic conditions of the interconnected systems and participate in the voltage regulation of the system.
- Supervise the functional state of the regulator alarming or triggering if operating conditions are not normal.
- Transfer from Automatic to Manual channel if excitation voltage or current stepout of their normal operation range.
- Prepare automatic transfer from voltage regulator (auto channel) to current regulator (manual channel) in case of fault, positioning the trigger angle using a follower circuit.
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