scope:

This standard applies to series-connected dry-type air-core single-phase and three-phase outdoor or indoor reactors of distribution and transmission voltage class that are connected in the power system to control power flow under steady-state conditions and/or limit fault current under short-circuit conditions. Dry-type air-core reactors covered by this standard are self-cooled by natural air convection.

With some restrictions, this standard is applicable to filter reactors, shunt capacitor reactors (used with shunt capacitor banks), and discharge current-limiting reactors (used with series capacitor banks). Annex A, Annex B, and Annex C are included to provide guidance.

This standard does not apply to devices such as

a) Shunt reactors (see IEEE Std C57.21™-2008⁾¹

b) Arc suppression coils

c) Neutral grounding devices (see IEEE Std 32™-1972 [B21])²

d) Line resonant reactors

e) High-voltage direct current (HVDC) smoothing reactors (IEEE Std 1277™-2010 [B23])

f) Forced cooled reactorsg) Line traps and radio interference (RI) filter reactors (ANSI C93.3-1995)

Purpose

The purpose of this standard is to define the requirements and test code for series-connected dry-type aircore reactors and, with some restrictions, filter reactors, shunt capacitor reactors, and discharge currentlimiting reactors.

¹ Information on references can be found in Clause 2.

² Numbers in brackets correspond to the numbers in the bibliography in Annex G.