The excitation system is responsible for supplying direct current for the synchronous machine field windings.
Beside regulator function, excitation system also work as a Limiter – Limit the synchronous machine to work within the boundary & capacity.
In addition, the modern excitation system equip with the Power System Stabilizer (PSS) function, to dampen the electromechanical oscillations arisen from the power system or the unit itself. Often according to the IEEE 421.5 model.
Through our collaboration with Reivax, we are proud to offer the state-of-art RTX excitation system and voltage regulator for full range of power generator
RTX excitation system provide the high performance solutions with advanced control features in an easy-to-install platform.
This cutting-edge solution for Excitation System/Automatic voltage regulator (AVR) is perfect for customers that seek an exceptional cost-benefit ratio solution. Key differentiators of RTX System are:
Compact platforms to easily replace aging systems.
Exceptional PSS and AVR performance
Reliable operation for all types of synchronous machines
Flexible installation and integration solutions
Economical solutions with quick delivery and easy
Since 1991, Reivax designed and produced the excitation control. Till today, more than 2000 system are installed.
Experience in replacing many excitation system AVR, i.e. ABB Unitrol P/M, Siemens Thyripol, Simadyn D, Basler SSE, GEC-Alsthom, Toshiba Analog AVR, and many more.
The brushless excitation is common used in many small to medium size generator. There’s no carbon brush, commutator or slip ring to the generator. Instead replace to Permanent magnet exciter and 3-phase main exciter with the silicon diode rectifier.
The excitation control DC output of voltage regulator will feed to the non-moving field winding of main exciter. The voltage regulator will regulate the field current of main exciter depending upon the excitation power requirement/generator voltage.
In static excitation systems, the power rectifier directly supplies the field winding of the synchronous machine. There is no pilot exciter.
A static excitation system is terminal-feed (also called bus-feed) when the supply is taken from the machine itself through a power potential transformer (PPT). The primary of the PPT is connected to the stator of the machine and the secondary supplies power to the rectifier.
Static excitation systems are not inherently self-exciting, so they require an external supply to jump-start the excitation process and build up sufficient magnetic flux. This process is called field flashing.
In the static excitation system, it is a complete system for control, power conversion, and protection. Its modular design with key components:
Regulator – Terminal voltage and reactive power control. Excitation systems use closed-loop or feedback control to regulate the machine’s output.
Limiters – Limit the synchronous machine to work within the boundary
Protections – Protection the machine, excitation system and auxiliary from damage.
Power System Stabilizer (PSS) – Damping of electromechanical oscillations arisen from the power system or the unit itself.
In order to provide the high reliability of the system, and to minimise the single point of failure, the excitation system can build with redundancy design.
In this design, one the control, I/O module, bridge, fan is on standby mode. It can activate in millisecond time, enhance the reliability.
The RTX comes with the human-machine interface offers the user all the options in a friendly environment and withgreat interactivity for operation, testing and maintenance. Graphics:
Many of the digital control is capable for remote communication with most DCS, HMI and SCADA. RTX control equips with communication capabilities:
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