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In 1986 IECO started a co-operation with ABB Finland in designing and manufacturing voltage regurators. Since then, a versatile line of excitation products, subassemblies and control cabinets have been created.
The key articles in excitation are AVR plates & control cabinets and GX300 voltage regulators and their variants. Applications vary from nuclear power plants to small back-up generators.
Since 1986 IECO has delivered 4000 GX regulators including dozens of different excitation plate variations with both single and redundant AVR topology.
The diode monitor is used with brushless synchronous generators for detecting diode failure in the rotating rectifier.
The diode failure is detected by measuring the current from the exciter field winding. When one of the diodes in the rotating rectifier fails, an AC current is induced in the exciter field winding. This AC current is summed with the DC current from the regulator. The diode failure is detected by analyzing the frequence induced by the failure.
In order to supply a full scale of service IECO also provides commissioning services for voltage regulators and subassemblies.