GOST 15150-1969 Machines, instruments and other industrial products. Modifications for different climatic regions. Categories, operating, storage and transportation conditions as to environment climatic aspects influence
GOST 1516.1-1976 Electrical equipment for a.c. voltages from 3 to 500 kV. Requirements to electrical strength of insulation
GOST 1516.2-1976 Electrical equipment and installations for a. c. voltages 3 kV and higher. General test methods of electrical strength of insulation
GOST 20690-1975 Electrical equipment for a.c. voltage 750 kV. Requirements for electric strength of insulation
GOST 21023-1975 Power transformers. Methods of measuring partial discharge characteristics during power frequency voltage testing
GOST 22756-1977 history
1977GOST 22756-1977 Power and voltage transformers and reactors. Test methods of electric insulation strength