CKK Series Air Core Reactors 1-Indoor or outdoor use. ... than 1000m. 3-Humidity 95%. 4-Effectively reduce loss CKK Series Air Core Reactor, iron core reactor , transformer reactor , resonant ... harmonics, limit resonant system frequencies Provide neutral grounding, limit line-to-ground fault currents Limit in-rush currents/overvoltages ... or in a level by support insulators. CKK Series Air Core Reactor