IEEE C57.21 : 2008

1 Overview
   1.1 Scope
   1.2 Purpose
2 Normative references
3 Definitions
   3.1 Shunt reactor
   3.2 Rating of a shunt reactor
   3.3 Insulation
   3.4 Losses and impedance
   3.5 Construction
   3.6 Methods of cooling
4 General requirements
   4.1 Service conditions
   4.2 Effect of air density on flashover voltage
   4.3 Frequency
   4.4 Effect of altitude on temperature rise
   4.5 Electrical properties of insulating oil
   4.6 Magnetic characteristics
5 Basis for rating shunt reactors
   5.1 kVA ratings
   5.2 Terms in which rating is expressed
6 Tests
   6.1 General
   6.2 Types of tests
7 Losses and impedance
   7.1 Total losses
   7.2 Impedance
8 Temperature rise
   8.1 Life of insulating materials
   8.2 Conditions under which temperature limits apply
   8.3 Limits of temperature rise for continuous ratings
9 Dielectric tests and insulation levels
   9.1 Dielectric tests
   9.2 Dielectric tests for line terminals
   9.3 Basic lightning-impulse insulation levels and insulation
        test levels for neutral terminals
10 Test code
   10.1 General
   10.2 Resistance measurements
   10.3 General dielectric tests
   10.4 Losses and impedance
   10.5 Temperature-rise tests
   10.6 Audible-sound-level test
   10.7 Vibration tests on oil-immersed shunt reactors
   10.8 Vibration tests on dry-type shunt reactors
   10.9 Magnetic characteristic measurements
   10.10 Seismic performance verification on oil-immersed and
         dry-type shunt reactors
11 Construction for oil-immersed shunt reactors
   11.1 Bushings
   11.2 Bushing-type current transformers
   11.3 Accessories
   11.4 Terminal markings
   11.5 Oil preservation
   11.6 Oil-preservation systems
   11.7 Tanks
   11.8 Shunt reactor finish
   11.9 Other equipment accessories
12 Construction and installation of dry-type shunt reactors
   12.1 General description
   12.2 Safety
   12.3 Magnetic clearances
   12.4 Connections
   12.5 Installed sound level
   12.6 Concrete foundations
   12.7 Switching - Circuit breakers
   12.8 Protection practices for air-core shunt reactors
Annex A (normative) Specific requirements for dry-type
        air-core thyristor-controlled reactors
Annex B (informative) Dielectric stresses imposed on shunt
        reactors during switching
Annex C (informative) Dielectric tests including information
        on wave shape control
Annex D (informative) Bibliography

This standard Applies to all oil-immersed or dry-type, single-phase or three-phase, outdoor or indoor shunt reactors rated over 500 kVA.