IEC 63132-1:2020 pdf download

IEC 63132-1:2020 pdf download.Guidance for installation procedures and tolerances of hydroelectric machines – Part 1: General aspects
1 Scope
The purpose of this part of IEC 63132 is to establish, in a general way, suitable procedures and tolerances for the installation of hydroelectric turbines and generators. This document presents a typical assembly. There are many possible ways to assemble a unit. The size of the machines, design of the machines, layout of the powerhouse and delivery schedule of the components are some of the elements that could result in additional steps, the elimination of some steps and/or assembly sequences. It is understood that a publication of this type will be binding only if, and to the extent that, both contracting parties have agreed upon it. Installations for refurbishment projects or for small hydro projects are not in the scope of this document. An agreement between all parties is necessary. This document excludes matters of purely commercial interest, except those inextricably bound up with the conduct of installation. The tolerances in this document have been established upon best practices and experience, although it is recognized that other standards specify different tolerances. Wherever this document specifies that documents, drawings or information is supplied by a manufacturer (or manufacturers), each individual manufacturer will furnish the appropriate information for their own supply only.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • • IEC Electropedia: available at http://www.electropedia.org/ ISO Online browsing platform: available at http://www.iso.org/obp
4 Concept
4.1 General For vertical units, reference axes are defined in relation to upstream, looking at the unit from the generator end (see Figure 1). Upstream corresponds to the Y+ axis, 0° and 12 h 00. The angles increase in the clockwise direction; therefore, the X+ axis corresponds to 90°, the right hand side and 3 h 00.4.6 Reference horizontal plane The reference horizontal plane is a horizontal plane located at the average elevation of a feature on the component that the other component should be aligned to. 4.7 Reference vertical plane The reference vertical plane is a vertical plane located at the average distance of a feature on the component that the other component should be aligned to. 4.8 Best fit plane The best fit plane is a calculated plane which represents a surface. The best fit plane minimizes the sum of perpendicular distances from each measurement point to the plane. 4.9 Axis of rotation The axis of rotation is the axis that all points on the rotating components rotate about. 4.10 Junction A step s, where two components meet, or where the projection of one component meets the other component (in cases where they are not in direct contact). See Figure 5.
5 Best practices
Throughout the assembly of both the turbine and generator, taking preventative measures to protect critical surfaces and components, such as flanges, bearings, windings, etc., from contamination due to welding, grinding, cutting, painting, dust, debris, etc., is considered to be a best practice. Whenever components are welded at site, they are subjected to the potential distortion because of stresses caused by welding. Care shall be taken to control the distortion within acceptable levels. Measurements, whenever possible, should be taken at equally spaced locations to attain a more accurate representation of the measured component. Readings taken to check a certain tolerance value are sometimes usable for checking other tolerance values simultaneously. For example, readings taken to check elevation may also be used to check level and/or parallelism, or readings taken to check concentricity may also be used to check circularity. This should be considered when determining how or what readings should be taken.