prEN IEC 63461:2023

SLOVENSKI STANDARD
01-julij-2023
Peltonove vodne turbine - Prevzemni preskusi modela
Pelton hydraulic turbines - Model acceptance tests
Turbines hydrauliques Pelton - Essais de réception sur modèle
Ta slovenski standard je istoveten z: prEN IEC 63461:2023
ICS:
27.140 Vodna energija Hydraulic energy engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

4/460/CDV
COMMITTEE DRAFT FOR VOTE (CDV)

PROJECT NUMBER:
IEC 63461 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2023-05-05 2023-07-28
SUPERSEDES DOCUMENTS:
4/442/CD, 4/449A/CC
IEC TC 4 : HYDRAULIC TURBINES
SECRETARIAT: SECRETARY:
Canada Mrs Christine Geraghty
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

TC 2,TC 114
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of
• any relevant patent rights of which they are aware and to provide supporting documentation,
• any relevant “in some countries” clauses to be included should this proposal proceed. Recipients are
reminded that the enquiry stage is the final stage for submitting "in some countries" clauses. See
AC/22/2007.
TITLE:
Pelton hydraulic turbines - Model acceptance tests

PROPOSED STABILITY DATE: 2026
NOTE FROM TC/SC OFFICERS:
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
Committee positions. You may not copy or "mirror" the file or printed version of the document, or any part of it, for
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IEC CDV 63461/Ed1 © IEC 2023 – 2 – 4/460/CDV
1 CONTENTS
2 CONTENTS . 1
3 FOREWORD . 9
4 1 Scope . 11
5 2 Normative references . 12
6 3 Terms, definitions, symbols and units . 13
7 3.1 General . 13
8 3.2 General terminology . 13
9 3.3 Units . 14
10 3.4 Definition of terms, symbols and units . 15
11 3.4.1 List of terms and definitions by topic . 15
12 3.4.2 Subscripts and symbols . 16
13 3.4.3 Geometric terms . 18
14 3.4.4 Physical quantities and properties . 19
15 3.4.5 Discharge, velocity and speed terms . 20
16 3.4.6 Pressure terms . 21
17 3.4.7 Specific energy terms . 21
18 3.4.8 Height and head terms . 22
19 3.4.9 Power and torque terms . 23
20 3.4.10 Efficiency terms . 25
21 3.4.11 General terms relating to fluctuating quantities . 26
a)
22 3.4.12 Fluid dynamics and scaling terms . 28
23 3.4.13 Dimensionless terms . 29
24 3.4.14 Terms relating to additional performance data . 29
25 3.5 Physical properties . 30
26 3.5.1 General . 30
27 3.5.2 Acceleration due to gravity . 30
28 3.5.3 Physical properties of water . 31
29 3.5.4 Physical conditions of atmosphere . 35
30 3.5.5 Density of mercury . 35
31 4 Requirements of tests . 36
32 4.1 Requirement of test installation and model . 36
33 4.1.1 Choice of laboratory . 36
34 4.1.2 Test installation . 36
35 4.1.3 Model requirements . 37
36 4.2 Dimensional check of model and prototype . 40
37 4.2.1 General . 40
38 4.2.2 Explanation of terms used for model and prototype. 40
39 4.2.3 Purpose of dimensional checks. 40
40 4.2.4 General rules . 41
41 4.2.5 Procedure . 41
42 4.2.6 Methods . 42
43 4.2.7 Accuracy of measurements . 46
44 4.2.8 Dimensions of model and prototype to be checked . 46
45 4.2.9 Permissible maximum deviations in geometrical similarity between
46 prototype and model . 48
47 4.2.10 Surface waviness and roughness . 50
48 4.3 Test procedures . 53

IEC CDV 63461/Ed1 © IEC 2023 – 3 – 4/460/CDV
49 4.3.1 Organization of tests. 53
50 4.3.2 Inspections and calibrations . 55
51 4.3.3 Execution of tests . 57
52 4.3.4 Faults and repetition of tests . 60
53 4.3.5 Preliminary test report . 61
54 4.3.6 Final test report . 61
55 5 Data acquisition . 63
56 5.1 Data acquisition and data processing . 63
57 5.1.1 Introduction . 63
58 5.1.2 General requirements . 63
59 5.1.3 Data acquisition . 63
60 5.1.4 Component requirements . 65
61 5.1.5 Check of the data acquisition system . 68
62 5.2 Fluctuating quantities . 70
63 5.2.1 Data acquisition and processing for measurement of fluctuating
64 quantities . 70
65 5.3 Error analysis . 74
66 5.3.1 Definitions . 74
67 5.3.2 Determination of uncertainties in model tests . 76
68 6 Methods of measurement . 82
69 6.1 Discharge measurement . 82
70 6.1.1 General . 82
71 6.1.2 Choice of the method of measurement . 82
72 6.1.3 Accuracy of measurement . 83
73 6.1.4 Primary methods . 84
74 6.1.5 Secondary methods . 85
75 6.2 Pressure measurement . 87
76 6.2.1 General . 87
77 6.2.2 Choice of pressure-measuring section . 88
78 6.2.3 Pressure taps and connecting lines . 88
79 6.2.4 Apparatus for pressure measurement . 90
80 6.2.5 Calibration of pressure measurement apparatus . 97
81 6.2.6 Vacuum measurements . 98
82 6.2.7 Uncertainty in pressure measurements . 98
83 6.3 Free water level measurement (see also ISO 4373) . 98
84 6.3.1 General . 98
85 6.3.2 Choice of water level measuring sections . 98
86 6.3.3 Number of measuring points in a measuring section . 99
87 6.3.4 Measuring methods . 99
88 6.3.5 Uncertainty in free water level measurement . 100
89 6.4 Shaft torque measurement . 101
90 6.4.1 General . 101
91 6.4.2 Methods of torque measurement . 101
92 6.4.3 Methods of absorbing/generating power . 102
93 6.4.4 Layout of arrangement . 102
94 6.4.5 Checking of system . 106
95 6.4.6 Calibration . 107
96 6.4.7 Uncertainty in torque measurement (at a confidence level of 95 %) . 107
97 6.5 Rotational speed measurement . 109

IEC CDV 63461/Ed1 © IEC 2023 – 4 – 4/460/CDV
98 6.5.1 General . 109
99 6.5.2 Methods of speed measurement . 109
100 6.5.3 Checking . 109
101 6.5.4 Uncertainty of measurement . 109
102 7 Test execution and results . 110
103 7.1 General .
...