A method of calculating the corona and radio-interference generating characteristics of either single or bundled transmission-line conductors is presented. Briefly the calculations are made in six steps by following the simple procedure outlined in the section "Method of Calculation." The concept of representing a bundled conductor by an "equivalent diameter" is presented and confirmed by the test results. Using this concept, it is shown that a single 1.602-inch-diameter ACSR conductor is approximately equivalent to a 2-conductor bundle of 795-MCM ACSR "Drake" conductors or a 3-conductor bundle of 477-MCM ACSR "Hawk" conductors. Likewise a single 1.75-inchdiameter conductor is approximately equivalent to a 2-conductor bundle of 954-MCM ACSR "Cardinal" conductors.

The Calculation of Radio and Corona Characteristics of Transmission-Line Conductors

Corona loss and radio interference (RI) from one single Drake conductor and one Drake 2-conductor bundle, installed on two short test lines have been measured at direct voltages up to 600 kv, positive and negative, under a variety of weather conditions and voltage levels. The Drake conductor is a 1.108-inch-diameter 795-MCM (thousand circular mil) ACSR (aluminum cable steel-reinforced) conductor with 16 outer strands of aluminum each of 0.175-inch diameter. Comparisons of corona-loss performance of these two conductor systems, obtained from both short-term voltage increment tests and from long-term constant voltage tests, are given. Equipment for loss measurements, including a shielding method which substantially reduces the measurement errors ordinarily introduced by losses through solid line insulation, is described. Results obtained from occasional surveys of RI at frequencies up to 10 mc (megacycles) are presented.

An Investigation of Corona Loss and Radio Interference from Transmission Line Conductors at High Direct Voltages

This bibliography presents references to significant literature in the field of extra-high-voltage (EHV) power systems. The most important references have been included up to 1946. Because of the rapid developments, since 1947, in the United States and abroad, of extra-high-voltage research and operating experience, the effort has been made to include all significant references from 1947 through 1957. Thus a total of 839 references are given, which are distributed chronologically as shown in Table I. It is clear that interest in extra-high voltages has increased steadily from the end of World War II to 1954, and is continuing to the present. These references are from more than 100 periodicals, published in 20 countries. The international character of the extrahigh- voltage art is therefore evident. For instance, the 173 references listed for 1956 and 1957 pertain to the following countries: United States 33%; USSR, 24%; Germany, 1 1%; Sweden, 8%; Switzerland, 6%; Great Britain, 4%; Canada, 3%; France, 3%; Finland, 2%; Japan and Italy, 1% each; other countries, 2%.

R. V. Nicolson

Papers

Investigation of Radio Noise from Existing Lines and Equipment to Aid in the Design or Future Extra-High-Voltage Lines