In July 2021 the design office of Transconverter LLC set about developing the test bench SI01 YHL4, which is meant for acceptance tests operation of unit BVI 4000 2K Y2.

The test bench SI01 YHL4 will generate from a three-phase voltage 400 V of frequency the output voltage till 1300V with an output single-phase current till 1100A and frequency 50Hz.
The test bench SI01 YHL4 includes MSUD (microprocessor-based engine control system) simulator of the locomotive 3ES5K, that allows to test and control the BVI 4000 2K Y2 operation at rated values of the voltage and the current.