外文翻译---电力变压器
《外文翻译---电力变压器》由会员分享,可在线阅读,更多相关《外文翻译---电力变压器(17页珍藏版)》请在毕设资料网上搜索。
1、附录 INTERNATIONAL STANDARD POWER TRANSFORMERS 1. Scope and service conditions 1.1 Scope This part of international Standard IEC60076 applies to three-phase and single-phase power transformers (including auto-transformers) with the exception certain categories of small and special transformers such as
2、: -single-phase transformers with rated power less than 1 KVA and three-phase transformers less than 5 KVA; - instrument transformers; - transformers for static convertors; -traction transformers mounted on rolling stock; -starting transformers ; -testing transformers ; -welding transformers ; When
3、standards do not exist for such categories of transformers, this part may still be applicable either as a whole or in part. 1.2 Service conditions This part gives detailed requirement for transformers for use under the following conditions: a) Altitude A height above sea-level not exceeding 1000 m .
4、 b) Temperature of ambient air not below - 25 and not above +40 .For water-cooled transformers , a temperature of cooling water at the inlet not exceeding +25 . c) Wave shape of supply voltage A supply voltage of which the wave shape is approximately sinusoidal. NOTE This requirement is normally not
5、 critical in public supply systems but may have to be considered in installations with considerable convertor loading in such cases there is a conventional rule that the deformation shall neither exceed 5 % total harmonic content nor 1 % even harmonic content .Also note the importance of current har
6、monic for load loss and temperature rise. d) Symmetry of three-phase supply voltage For three-phase transformers, a set of three-phase supply voltage which are approximately symmetrical . e) Installation environment An environment with a pollution rate that does not require special consideration reg
7、arding the external insulation of transformer bushings or of the transformer itself. An environment not exposed to seismic disturbance which would otherwise require special consideration in the design. This is assumed to be the case when the ground acceleration level is below 2 m/s . Provision for u
8、nusual service conditions Any unusual service conditions which may lead to special consideration in the design of a transformer shall be stated in the enquiry and the order . These may be factors such as high altitude , extreme high or low temperature ,tropical humidity , seismic activity , severe c
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中设计图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 外文 翻译 电力变压器
