2006 saw the developed of an SPCRS-15750/800 converter with microprocessor control system (voltage 15750 V, power 22 MW). It is designed to start reversible hydrogenerators at Pumped Storage Power Plants.
RTA-37 high-voltage static converter for centralized system of passenger coach power supply was modernized in 2006. Output power was increased and a three-phase sinusoidal output channel was iapplied.
In 2005 there was modernization of rectifiers for fusing titanium in vacuum arc furnaces. The analogue control system was replaced by a microprocessor control system.
In 2005 modernization of heat exchangers alsotook place. The analogue control system was replaced by a microprocessor control system.
TFC-1600 converter (power 1600 kW, frequency 500 Hz) was developed, produced and put into use between 2005 and2006.
AR series power converter for direct current arc furnaces (power 2200 kW or 4300 kW) was developed and produced in 2005-2006.
In 2005 Estel developed, produced and put transistored frequency converters into use with a power of 40kW, a frequency of 10 kHz and an air-cooling system.
