BS EN 50180-3:2015 pdf download – Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid flled transformers Part 3: Requirements for bushing fxations
This European Standard should be considered in factual context with EN 50180-1 only. Constructional details for fastenings and their details are supplementing EN 50180-1. This information is of importance for utilities concerning compatibility.
For a better understanding of additional information some dimension from EN 50180-1 are repeated in this European Standard.
This European Standard was extended for fastenings of bushings for a highest voltage of 52 kV.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references,the latest edition of the referenced document (including any amendments) applies.
EN 50180-1:2015, Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers — Part 1: General requirements for bushings
EN 22768-1, General tolerances – Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1)
EN 22768-2, General tolerances – Part 2: Geometrical tolerances for features without individual tolerance indications (ISO 2768-2)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 50180-1:2015 apply.
4 Dimensions and designations
Permissible deviations for tolerances without specified limits: EN 22768 (series).
4.1 Fixations for bushings
The fixation of the bushing is made with a flange ring and a defined number of clamping paws as illustrated in Figure 1.
Example: designation A
4.2 Details for fixations
Designation: Flange ring A