BS EN IEC 63461:2024 - Page 3

Pelton hydraulic turbines. Model acceptance tests. | Status: Current

1 Scope This document applies to laboratory model tests of any type of Pelton hydraulic turbine. This document applies to models of prototype machines with unit power greater than 5 MW. Full application of the procedures herein described is not generally justified for machines with smaller power. Nevertheless, this document can be used for such machines by agreement between the purchaser and the supplier. This document excludes all matters of purely commercial interest, except those inextricably bound up with the conduct of the tests. This document is concerned with neither the structural details of the machines nor the mechanical properties of their components, so long as these do not affect model performance or the relationship between model and prototype performances. This document covers the arrangements for model acceptance tests to be performed on Pelton turbines to determine if the main hydraulic performance contract guarantees (see 9.2) have been satisfied. It contains the rules governing test conduct and provides measures to be taken if any phase of the tests is disputed. The main objectives of this document are:

• - to define the terms and quantities used;
• - to specify methods of testing and of measuring the quantities involved, in order to ascertain the hydraulic performance of the model;
• - to specify the methods of computation of results and of comparison with guarantees;
• - to determine if the contract guarantees that fall within the scope of this document have been fulfilled;
• - to define the extent, content and structure of the final report.

The guarantees can be given in one of the following ways:

• - guarantees for prototype hydraulic performance, computed from model test results considering scale effects;
• - guarantees for model hydraulic performance.

Moreover, additional performance data (see Clause 10) can be needed for the design or the operation of the prototype of the hydraulic machine. Contrary to the requirements of Clause 8 related to main hydraulic performance, the information of these additional data given in Clause 10 is considered only as recommendation or guidance to the user (see 10.1). Model acceptance tests are performed if the expected field conditions for acceptance tests (see IEC 60041:1991) would not allow the verification of guarantees given for the prototype machine. It is important that the method for performance conversion from model to prototype be clearly defined in the main hydraulic performance contract. This document can also be applied to model tests for other purposes, i.e. comparative tests and research and development work. If model acceptance tests have been performed, field tests can be limited to index tests (see IEC 60041:1991). If a contradiction is found between this document and any other document, this document prevails.