FIELD: automatic accident- preventing facilities for power systems. SUBSTANCE: protection of power plant against asynchronous running is effected by controlling its generators. To this end, factors causing instability are analyzed and when instability occurs, rate and acceleration of transmission angle variation are measured, desired system control characteristics are determined by comparing actual dynamics of line condition variations with desired value, and generators are turned off in turn until rate and acceleration of angle variation are brought down below specified values. EFFECT: provision for preventing asynchronous running while maintaining communications over power transmission line. 5 dwg
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