This paper deals with the scope of reactor short-circuit testing, and the type testing of the various forms of reactor construction.The principles of current-limiting reactor operation are briefly described, and proposals for the short-circuit rating of reactors are given.The short-circuit testing of reactors is considered from the point of view of the manner of testing, suitable test plant, and the dynamic and thermal effects of the test current.A suitable test programme is described, and examples of test results obtained by the authors are included, with an analysis of the oscillograms and suggested criteria for the acceptance of reactor short-circuit tests.