Abridgment of “synchronized at the load” — II: Calculations of system performance

This paper describes the results of calculations made for operating the Hell Gate and Sherman Creek generating stations of the United Electric Light and Power Company, synchronized at the load. After reducing the numerous branches of the system to a simpler equivalent, calculations were made on the operation of an isolated section. These calculations indicated ample static stability and transient stability under fault conditions representing the maximum which might normally be expected. Other calculations were made indicating that the entire system with synchronizing paths completed through the substation low-voltage busses, would likewise meet the required stability conditions. Tentative system design factors based on the calculations and experience to date are suggested as a guide to system planning. This paper shows a practical application of the theories and principles developed in the studies of transmission stability. In the present case, a somewhat different object was in view inasmuch as it was desired to substantiate ideas as to the feasibility of the plan of synchronizing at the load rather than to obtain numerical limits.