Adopt dual cooperative control technology and frequency automatic following control , the protective performance is more complete and its reliability is much higher , low heat penetrating effect of frequency is good 200型主要特點(diǎn):采用雙調(diào)控技術(shù),頻率自動跟蹤控制,保護(hù)性能更完善,機(jī)器可靠性更高,頻率低透熱效果好。