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The features of the tuning of filters, connected with the tertiary windings of converter transformers, is considered. It is shown that such a connection is effective, but encounters difficulties due to the fact that the tunable filters have impedances as low as the external circuits. A theory and practical methods are given on how to overcome these difficulties. Positive results, obtained when tuning the filters in the Vyborg dc installation are described.

It is shown that the fourth converter unit with a capacity of 350 MW commissioned in 2000 at the Vyborg back-to-back direct-current converter station connecting the power systems of Russia and Finland increased the total installed power of the converter units to 1400 MW. The circuitry of the converter station and its connections permits two independent transmissions through the Vyborg substation with mutual redundancy and with allowance for the requirements of the receiving power system with respect to the maximum power of each transmission. Normal and emergency operating conditions are described. Difficulties encountered in the course of the work and measures taken for their elimination are discussed.

It is shown that the fourth converter unit with a capacity of 350 MW commissioned in 2000 at the Vyborg back-to-back direct-current converter station connecting the power systems of Russia and Finland increased the total installed power of the converter units to 1400 MW. The circuitry of the converter station and its connections permits two independent transmissions through the Vyborg substation with mutual redundancy and with allowance for the requirements of the receiving power system with respect to the maximum power of each transmission. Normal and emergency operating conditions are described. Difficulties encountered in the course of the work and measures taken for their elimination are discussed.