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1771-IAN
2医疗IT系统功能及特点
医用隔离电源系统(即医用IT系统)，又叫中性点不接地的配电系统，系统负载中的导体和无负载电流经过的导电部分经接地保护线接地。在IT系统中，如果出现单相接地故障，对地漏电流只能经过系统泄漏电容对系统相线构成回路，而系统泄漏电容引起的容抗总是远远大于TN系统中的接地电阻，因此IT系统中的短路其不会因接地电流的存在而引起过电流而动作，从而系统能带故障运行。
医疗IT系统设置在医疗2类场所的作用：
(1)隔离电源系统即中心点不接地系统，其因降低了接触电压和电网对地的泄漏电流，故有效控制对人体内部的直接漏电，从根本上杜绝产生微电击医疗事故的危险;
(2)防止接地系统内的漏电流窜入某些与病人连接的医疗电气设备的对地回路;
(3)当供电系统内出现个对地漏电流故障时，不会导致断路器或熔断器动作，供电的可靠性。同时，绝缘监视仪报警，提示故障类型，以便维修人员及时修复;
(4)降低了对地漏电流，从而提高了防火安全性;
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