Our field of activities in industrial electronics offers projects, planning, commissioning and maintenance of rectifiers for multiple applications.

 

We are your partner for:

• Digital exciter control equipment for rotative exciters of synchonous alternators and motors of 2 to 50 MW

• Static exciter equipment for alternators of 20 to 1200 MVA

• Revamping of rotative exciters into static exciters

• Starting invertors for gas turbine power stations or mixed duty equipment

• Rectifiers for the control of pump storage plants

• High current equipment for the supply of electrolysis and furnaces

 

Exciter equipment

Our static exciters have been in worldwide service for many years. The most frequent applications are alternators driven by gas, steam or water turbines of 20 to 1200 MVA. In order to increase the availability, the controls will be executed digitally and redundantly. The fans employed for cooling can be dimensioned, if desired, with the double capacity. We will design and elaborate solutions according to your wishes.

Our company is specialized in modernizing existing plants. We can substitute rotating exciters by static power electronics. Existing rotating exciters register remarkably high losses and have a time lag in controlling. The static execution of the exciter performs very dynamically in case of load disconnection and avoids high overvoltages. The inherent losses of a power station can be reduced notably and therefore the payback of the investment for the modification is secured.

Excitation equipment up to approx. 700A of the series TRM are supplied under the logo SEMIEXCITER for motors and alternators. For larger power plants, especially for alternators of power plants, we supply such equipment under the logo SEMIPOL..

Diagram of an exciter apparatus in modular execution as feeder for a rotating exciter

1. Main machine 2. Rotating diodes 3. Rotating exciter 4. Exciter energy 5. Excitation in short circuit 6. Actual value U gen 7. Actual value I gen

Design of a static exciter unit for small and medium machines

1. Main machine 2. Voltage transformer 3. Current transformer 4. Air gap reactor 5. Actual value U gen 6. Actual value I gen

Our supply includes the alternator measuring equipment and the alternator protection if desired.

A single line diagram of a SEMIEXCITER equipment for 100V and 600A is available as pdf file.

 

The following single line diagram shows three exciter equipments for alternators of 350 MVA each.

 

Starting inverters

For refurbishing power stations we design and supply starting inverters for gas turbine sets with approx. 4 MW and large hydro turbine sets with a starting output up to 20 MW.

Start up system for generator and turbine shaft	Start up inverter for hydro generator

For multiple alternator plants we supply commutation gear, so that one starting inverter can start e.g. 3 alternators.

 

Power electronic equipment for control of motor and alternator in pump storage plants

The following picture shows a 10 kV inverter for a synchronous alternator of 21,3 MW for reequipment of a pump storage plant. This 6-pulse inverter with intermediate circuit with constant current makes it possible to control the speed of a machine set with primary and secondary control of the line. Detailed information about the execution of the plant is available as pdf file.

 

High current plants and supplies for electrolysis and arc furnaces

We supply large DC converters for steel melting furnaces (EAF). For the chemical industry and different electrolysis plants we design water cooled rectifiers and transformers. The plants will be laid out according to the local requirements. We can supply rectifiers up to 1200 V and 40 kA in B6 connection or approx. 300 V and 60 kA with interphase transformers.. According to the requirements we can supply rectfiers with thyristors or diodes.

The central picture shows a rectifier with water cooling as a star connected rack (half a three phase bridge) for 15 kA in B6 connection.

 

Thyristor Converters

With the new series of thyristor converters Thyro-S, Thyro-A and Thyro-P of AEG we are presenting the new Thyro family which has a widespread communication property. High availability, reproducability and communicability are a basis for excellent and amply documented quality in application.

AEG thyristor converters operate, control and regulate electrical energy worldwide in industrial applications, beginning with simple tasks with low cost optimized analogous converters up to complex applications for highest requirements. AEG thyristor converters can be found where melting, heating, drying and transformation with precision and reliability are required. Apart from high product quality according to DIN EN ISO 9001, the Thyro family offers safety for application processes by experience in research and development. We can offer user specific solutions with special requirements.

Resistors

For heating equipment for the control of slipring motors, lifting magnets and other applications, our self cooling resistors are suitable. A resistor equipment consists of a casing and the built in resistors. The design varies between cast iron resistors, wire resistors , steel frames and grids. For a quotation, we need the duration of operation, type of application, the quantum of heating energy and the electrical data. For your inquiry you may use this pdf form.

 

 

Power electronics

For control and automation purposes, we offer thyristors, diodes, diode modules, diode phase control and choppers.

 

Accessories

Our scope of supply covers e.g. contacts and contact components, braided connectors, current leads, control leads and bus bars / collecting bars.

 

Converters

We supply voltage converters, current transformers and DC-DC- transformers for transport systems.

 

Electro-hydraulic lifters and servo drives

We can supply spare parts for electro-hydraulic lifters of AEG ELDRO. For revamping and repair of controls we can supply AEG DREHMO servo drives.