序言这是CSA C301的第二版。2、三相潜水配电变压器。它取代了1979年出版的第一版。1本标准涵盖额定电压为75至3000 kV的三相潜水变压器的特点。A.注:对于本文未涵盖的细节，应参考CSA C2。1.1.2本标准仅适用于三相配电变压器装置，该装置拟用于地面以下的通风拱顶或外壳中，所有终端和附件均已安装或接近安装，以便在地面以上运行。它不适用于（a）与地面接触的直埋变压器；（b） 永久浸入式变压器； 或（c）网络型变压器。1.3本标准涵盖的设备主要用于电力设施在具有高压的有效接地地下配电系统上运行，如表1所示。注:非电力公司按照本标准操作变压器时，可能会受到具有管辖权的电气检查机构的附加要求的约束。1.4本标准所涵盖的设备通常有两个高压套管，每个相位设计用于变压器箱内的回路馈电。高压开关和熔断器保护通常连接在该内部回路馈电元件和高压变压器之间- 电压绕组不在本标准范围内，由买方指定。1.5在CSA标准中，“应”用于表示要求，即用户有义务满足的条款，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。

PrefaceThis is the second edition of CSA C301.2, Three-phase submersible distribution transformers.It supersedes the first edition, published in 1979.1 Scope1.1This Standard covers the features of three-phase submersible transformers rated 75 to 3000 kV.A.Note: For details not covered herein, reference should be made to CSA C2.1.1.2This Standard applies only to three-phase distribution transformer units intended for use in a ventilated vault or enclosure below grade level, with all terminations and accessories cover mounted, or nearly so, for operation above grade.It does not apply to(a) directly buried transformers in contact with the earth;(b) permanently submerged transformers; or(c) network-type transformers.1.3The equipment covered by this Standard is intended primarily for operation by electrical utilities on effectively grounded underground distribution systems having high voltages, as shown in Table 1.Note: The operation of transformers complying with this Standard by other than an electric utility may be subject to additional requirements by the electrical inspection authority having jurisdiction.1.4The equipment covered by this Standard typically has two high-voltage bushings for each phase designed for circuit loop feed within the transformer tank. High-voltage switching and fuse protection normally connected between this internal loop feed element and the transformer high-voltage winding is not covered by this Standard and is specified by the purchaser.1.5In 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.