As a part of Power Plant automation, BHEL-EDN has been manufacturing Excitation systems from 1978. Over 1200 units of excitation systems (direct and indirect type), based on different hardware platforms, are in operation in India as well as abroad. The present range of manufacture for all applications, are Digital Excitation Systems, on well established Digital Voltage Regulation where in BHEL has bagged orders for over 300 systems, most of which are in operation in various project sites.

Direct excitation systems

BHEL make Static Excitation Equipment comprises of the following main assemblies :

Rectifier Transformer 

Thyristor Bridges 

Control Electronics (Digital)

Field Flashing

Field Suppression

Over Voltage Protection

Indirect Excitation System

Indirect excitation system normally called as Automatic Voltage Regulator (AVR) consists of the following. The indirect excitation refers to both DC exciter and AC exciter (brushless exciter) machines.

Rectifier Transformer
Thyristor Bridge
Control Electronics (Digital)
The controls using microprocessor based digital voltage regulation are same as that of Static Excitation Equipment.
Field Suppression

Technical Specifications

Applications

Direct and Indirect excitation for Electric Power Generating Equipment (rated 6 MW and above for Industrial CPP applications and Power Generating Utilities)

· Turbo Generators
· Gas Turbine Generators
· Hydro Generator 
· Diesel Generating sets 

Direct and Indirect excitation for Electric Power Generating Equipment (rated 1 MW and above)

Export projects in 
¨ Oman
¨ Bhutan
¨ Sri Lanka
¨ Bangladesh 
¨ Australia
¨ China
¨ Azerbaizan
¨ Iraq
¨ Kazakhstan

Supplies in India
Industrial CPP , Thermal and GT Based Utilities, Hydel Power Stations