这是CSA C227的第一版。5、三相带电前置安装式配电变压器。A. 本标准的前一版本发布为CAN/CSA-C227。2-88题为“三阶段”， 带电前置、安装在垫板上的配电变压器，并于1995年退出。当前版本包括 旨在使本标准符合现行惯例的技术和编辑性修改。1.范围1。1本标准规定了三相带电前置式配电变压器单元的要求，该配电变压器单元由变压器和可分离或整体式电缆入口隔间组成； （b） 额定电压为75至3000 kV-A，拟在具有表1和表2规定的首选额定电压的三相地下配电系统上运行；和（c）用于户外安装在没有额外防护外壳的垫子上。1.2本标准不适用于包含用于容纳单独三相变压器或一组单相变压器的外壳的设备（见CAN/CSA-C2.1）。注:符合本标准的变压器，如果由电力公司以外的机构操作，可能会受到具有管辖权的电气检查机构规定的附加要求的约束。 1.3本标准允许在不修改电缆或焊盘的情况下，用不同制造商提供的具有相同基本物理尺寸的另一个装置替换带电的前焊盘安装装置。本标准涵盖径向和环形馈电系统的终端布置，包括某些最小尺寸和其他尺寸。注:这一概念不应被理解为意味着一个制造商变压器的电缆入口隔间将与另一个制造商变压器的电缆入口隔间兼容。1.4在CSA标准中，“应”用于表示要求，即:。 e、 ，用户必须满足的条款，以符合标准；“应该”用于表示建议或建议但不需要的建议；“可”用于表示一种选择或在标准范围内允许的选择；“can”用来表示可能性或能力。注释随附条款不包括要求或替代要求；随附条款的注释的目的是将解释性或信息性材料与文本分开。表和图的注释被视为表或图的一部分，可以作为要求编写。 附件被指定为规范性（强制性）或信息性（非强制性）以定义其应用。

This is the first edition of CSA C227.5, Three-phase live-front pad-mounted distribution transformers. A previous version of this Standard was published as CAN/CSA-C227.2-88 under the title Three-Phase, Live-Front, Pad-Mounted Distribution Transformers and withdrawn in 1995. The current version includes technical and editorial changes intended to bring this Standard into line with present practice.1 Scope1.1This Standard specifies requirements for three-phase live-front pad-mounted distribution transformer units that(a) consist of a transformer and a separable or integral cable entrance compartment;(b) are rated 75 to 3000 kV-A and intended for operation on three-phase underground distribution systems having the preferred rated voltages specified in Tables 1 and 2; and(c) are intended for mounting outdoors on pads without additional protective enclosures.1.2This Standard does not apply to equipment involving enclosures for housing a separate three-phase transformer or a bank of single-phase transformers (see CAN/CSA-C2.1).Note: It is possible that transformers complying with this Standard will, if operated by a body other than an electrical utility, be subject to additional requirements specified by the electrical inspection authority having jurisdiction.1.3This Standard allows for the replacement of a live-front pad-mounted unit by another unit of the same basic physical size from a different manufacturer without modification to cables or pad. This Standard covers terminal arrangements for both radial and loop-feed systems, including certain minimum and other dimensions.Note: This concept should not be understood to imply that the cable entrance compartment of one manufacturer's transformer will be compatible with that of another manufacturer's transformer.1.4In CSA Standards, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; "may" is used to express an option or that which is permissible within the limits of the standard; and "can" is used to express possibility or capability. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.