IEEE C57.21:1990 (R2004)

Revision Standard - Superseded.
All oil-immersed or dry-type, single phase or three-phase, outdoor or indoor shunt reactors rated over 500 kVA are covered. Terminology and general requirements are stated, and the basis for rating shunt reactors is set forth. Routine, design, and other tests are described, and methods for performing them are given. Losses and impedance, temperature rise, dielectric tests, and insulation levels are covered. Construction requirements for oil-immersed reactors and construction and installation requirements for dry-type reactors are presented.

This standard applies to all oil-immersed or dry-type, single-phase or three-phase, outdoor or indoor shunt reactors rated over 500 kVA. This standard does not apply to other devices such as Shunt reactors, 500 kVA and smaller Current-limiting reactors (see ANSI C57.16-1958 [1])Arc-suppression coils Neutral-grounding devices (see IEEE Std 32-1972 [22])Saturable reactors Line-resonant reactors Filter reactors