低压辅助电源系统 第2-3部分：设计准则 变电站低压交流辅助电源系统

[中文适用范围]： IEC TS 63346-2-3:2025 规定了低压（LV）交流辅助电源系统（APS）设计的通用规则和要求，这些系统主要用于变电站内安装，主要涵盖交流电源配置、系统布线、保护措施、电气设备选型和物理布局。为便于理解本文档，本文档中所指的交流辅助电源系统（AC APS）定义如下：- 额定电压不超过且包括1 kV交流；- 向变电站交流负荷提供低压交流电源。尽管在必要时进行了讨论，但交流负荷以及高压（HV）部分均不在本文档的范围内。本文档中所指的变电站是指属于电力系统的一部分，包含接收和分配电能或将电压转换为所供电负荷所需水平的设备，或同时具备这两种功能的变电站。 [外文原描述]： IEC TS 63346-2-3:2025 specifies common rules and requirements for the design of low voltage (LV) AC auxiliary power systems (APSs) intended to be installed in substations, mainly covering the configuration of AC power sources, system wiring, protection, electric equipment selection and physical layout. For the purpose of interpreting this document, an AC APS in this document is considered as follows: - with a nominal voltage up to and including 1 kV AC; - providing LV AC power to substation AC loads. Though it is discussed where necessary, AC loads as well as high voltage (HV) part is beyond the scope of this document. Substations in this document refer to those which are part of an electrical system and contain equipment that either receives and distributes electrical energy or transforms voltages to the levels required by the loads they supply, or both.