Theory and tests of the counterpoise

Different theories have been advanced as to the behavior of the counterpoise in the protection of power transmission lines against lightning. In an attempt to learn more about the counterpoise and to check the theories of its behavior, a series of basic field tests was conducted. The results of these tests, made on both the parallel insulated counterpoise and the buried counterpoise, are reported in this paper. The data obtained are analyzed, and conclusions are drawn.