Steady-state stability of synchronous machines as affected by voltage-regulator characteristics

C. F. Wagner (Westinghouse Electric and Manufacturing Company, East Pittsburgh, Pa.): While the paper by Mr. Concordia is doubtless correct for the particular assumptions made, the conclusions drawn are much too general for the actual analysis presented. The author should have stated specifically whether the general conclusions drawn were backed up by further analysis not given in the paper or by tests devised especially to establish these points. Whereas tests are referred to, no actual data are given in the paper. For example, I am inclined to agree with Mr. Concordia that amortisseurs have little effect upon the power limit, but I fail to find the evidence in the paper upon which this conclusion is based. Similar considerations apply to the effect of antihunt devices in the regulator circuit.