1.1 Type and ZW32-12 / 630-20 outdoor high-voltage vacuum circuit breakers. 1.2 The main purpose ZW32-12 / 630-20 outdoor high-voltage vacuum circuit breaker (hereinafter referred to as breaker) rated voltage 12KV, three-phase AC 50Hz outdoor distribution equipment. Mainly used for breaking, closing power system load current, overload current and short circuit current. For substation and industrial and mining enterprises in the power distribution system of workplace protection and control purposes, and rural power grids frequent operation. This installation manual provides the main technical parameters of the circuit breaker, the product mix, as well as the principles and methods of operation, installation, use and maintenance of content. 1.3 Reference standard circuit breaker in line with "GB / T11022 high-voltage switchgear and control equipment standards common technical conditions", "GB1984-89 AC circuit breaker" "GB1985-89 High voltage isolating switches and earthing switches" and DL404, IEC56 and other standards requirements. 1.4 Use of environmental conditions 1, altitude of not more than 2000 m; 2, ambient air temperature: -45 ℃ ~ + 65 ℃; diurnal temperature: the diurnal variation of 25 ℃; 3, the wind speed is not greater than 35m / s; 1.6 The main technical parameters No. Item Unit Value 1 Rated voltage kV 12 2 Rated frequency Hz 50 3 Rated current A 400,630 4 rated short-circuit breaking current kA 16,20 5 Rated peak withstand current kA 40,50 6 rated short time withstand current (4S) kA 16,20 7 rated short-circuit current (peak) kA 40,50 8 100 009 times Mechanical life Rated current breaking times 1000010 Rated short circuit breaking current breaking times 30 11 1min power frequency withstand voltage (wet) ( dry) white, on the ground / fracture kV 42/49 12 Lightning impulse withstand voltage (peak) relative, on the ground / fracture kV 75/85 13 secondary circuit 1min power frequency withstand kV 2