This standard applies to the following types of reactors: This standard generally does not apply to the following reactors: small reactors with a capacity less than 2kvar for single-phase and 10kvar for three-phase; reactors for special purposes (such as high-frequency wave traps for lines or installed in Reactors on railway vehicles). Note: When there is no corresponding national standard for the above-mentioned small-capacity and special reactors, this standard can be applied in whole or in part.