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Excitation system

An essential component for generation of electrical energy

ANDRITZ HYDRO excitation systems stand for high availability as well as efficiency, robustness, high MTBF time, and a lifetime of about 30 years or more. Our modular concept provides an optimal solution for all generator sizes, customers, and plants.

The excitation system of a synchronous generator makes it possible to supply the energy generated by an engine (turbine) to the power grid. As a result, high priority is assigned to the reliability and availability of excitation equipment when choosing systems.

ANDRITZ can deliver all technical solutions for excitation systems and fulfill all technical requirements of our customers.

ANDRITZ HYDRO provides four types of THYNE excitation systems:

  • THYNE1 (for small generators with or without exciter machines, up to 25 A field current)
  • THYNE4 (for generators with exciter machines, up to 400 A field current)
  • THYNE5 (static excitation for generators with slip rings, up to 4000 A field current)
  • THYNE6 (static excitation for generators with slip rings, up to 10000 A field current)

Our THYNE system stands for:

  • Sophisticated technology and know-how
  • Decades of research and experience in the development of excitation systems
  • Highest availability and efficiency
  • Long lifetime of about 30 years and more
  • Robustness and high MTBF time

Comprehensive services, spare part guarantee for many years, and training classes complete our scope of delivery.

Nowadays rotary pilot exciters are being replaced more and more by thyristor excitation systems. If it is economically justifiable to retain pilot exciters and there are no high demands made regarding regulating dynamics and improvement of efficiency, operating performance can be improved by replacing an existing voltage regulator with a modern, digital multi-function automatic controller. A static excitation system is supplied via an excitation transformer from a power source. Should the source be the generator stator itself, we refer to a “shunt field excitation system”. If the excitation transformer is connected to an external power source, for example an AC generator mounted on the rotor shaft, or to the auxiliary supply of the plant, it is referred to as an “excitation system with external supply”. The output voltage of the excitation transformer is rectified and controlled by a thyristor bridge, and feeds the field winding via the rotor brushes.

A further possibility is to use a rotating exciter machine, which can either be a brushless AC exciter with flywheel diodes or, especially in older plants, a DC exciter machine. The flywheel diodes are mounted on the common shaft of generator and rotating exciter, and supply the DC current for the rotor. A six-pulse thyristor unit controlled by a voltage regulator regulates the exciter field.

THYNE1 compact excitation

THYNE1 compact excitation

THYNE6 static excitation system

THYNE6 static excitation system



Phone: +43 50805 56884

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