FIELD: automatic emergency-control facilities for power transfer over transmission lines interconnecting two power systems. SUBSTANCE: power transmission angle $$$ and $$$ are measured in post-accident situation when some portion of power is lost; as soon as $$$ reaches zero, angle $$$ is recorded and compared with $$$. If $$$, next portion of load is disconnected. EFFECT: provision for eliminating disconnection of too much load. 1 dwg ЫЫЫ1
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