IEC 61225:2019规定了核电站中低压静态不间断电源（SUPS）系统的性能和功能特性，对于适用部件，一般适用于核设施。不间断电源是一种电气设备，它从电源汲取电能，储存电能，并通过设备内部的装置以指定的形式维持对输出端子的供应。静态不间断电源（SUPS）没有旋转部件来执行其功能。 这第三版取消并取代了2005年出版的第二版。与上一版相比，此版本包括以下重大技术变更: A）？本版的主要目的是解决核电厂静态不间断电源的要求；b）？除了仪表和控制（I&C）电源之外，还包括所有静态不间断电源； c）？强调静态不间断电源应保护连接的设备（负载）免受现场交流配电系统瞬变的影响（抗扰度概念）； d）？根据纵深防御概念，本标准适用于所有设备的静态不间断电源，不仅适用于对安全重要的设备，并采用分级方法进行验证和确认； e)增加要求，当电池在异常操作条件下并联时，应用隔离装置对其进行适当保护，以避免任何可能损害不间断电源一个以上分区的故障。

IEC 61225:2019 specifies the performance and the functional characteristics of the low voltage static uninterruptible power supply (SUPS) systems in a nuclear power plant and, for applicable parts, in general for nuclear facilities. An uninterruptible power supply is an electrical equipment which draws electrical energy from a source, stores it and maintains supply in a specified form by means inside the equipment to output terminals. A static uninterruptible power supply (SUPS) has no rotating parts to perform its functions.
This third edition cancels and replaces the second edition published in 2005. This edition includes the following significant technical changes with respect to the previous edition:
a)？ the principal objective of this edition is to address the requirements on the static uninterruptible power supplies in nuclear power plants;
b)？ in addition to Instrumentation and Control (I&C) power supplies include all static uninterruptible power supplies;
c)？ emphasize that the static uninterruptible power supplies shall protect the connected equipment (loads) from transients on the on-site AC distribution system (the immunity concept);
d)？ in accordance with the defence-in-depth concept, this standard applies to static uninterruptible power supplies for all equipment, not only for equipment important to safety, with a graded approach to verification and validation;
e) addition of the requirement that, when batteries are connected in parallel under abnormal operating conditions, they shall be properly protected with isolation devices to avoid any failure that may impair more than one division of the uninterruptible power supply.