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BS EN IEC 61238-1-2:2019

BS EN IEC 61238-1-2:2019

$198.66

Compression and mechanical connectors for power cables – Test methods and requirements for insulation piercing connectors for power cables for rated voltages up to 1 kV (Um = 1,2 kV) tested on insulated conductors

Published By Publication Date Number of Pages
BSI 2019 62
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This part of IEC 61238 applies to insulation piercing connectors for power cables for rated voltages up to 1 kV (Um = 1,2 kV), for example according to IEC 60502-1 or other buried cables and cables installed in buildings, having

  1. conductors complying with IEC 60228 having nominal cross-sectional areas between 2,5 mm2 and 300 mm2 for copper and between 16 mm2 and 500 mm2 for aluminium,

  2. a maximum continuous cable temperature not exceeding the insulation material properties.

This document is not applicable to connectors for overhead line conductors nor to connectors with a sliding contact.

The object of this document is to define the type test methods and requirements, which apply to insulation piercing connectors for power cables with copper or aluminium conductors. The reference method is to perform the tests on unused insulated conductors.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 English
CONTENTS
10 FOREWORD
12 INTRODUCTION
13 1 Scope
2 Normative references
3 Terms and definitions
15 4 Symbols
16 5 General
5.1 Definition of classes
5.2 Cable
17 5.3 Connectors and installation procedure
5.4 Range of approval
18 6 Electrical tests
6.1 Installation
6.1.1 General
6.1.2 Through connectors
19 6.1.3 Branch connectors
6.2 Measurements
6.2.1 General
6.2.2 Electrical resistance measurements
20 6.2.3 Temperature measurements
Figures
Figure 1 – Position of thermocouples
21 6.3 Heat cycling test
6.3.1 General
6.3.2 First heat cycle
6.3.3 Second heat cycle
Tables
Table 1 – Minimum period of temperature stability
22 Figure 2 – Example of second heat cycle profile
23 6.3.4 Subsequent heat cycles
6.4 Short-circuit test for connectors according to Class A
Table 2 – Electrical resistance measurements during the electrical test
24 6.5 Assessment of results
6.6 Requirements
25 6.7 Examples of electrical test loop configurations and associated parameters
Table 3 – Electrical test requirements
26 Figure 3 – Typical electrical test loop for throughconnectors installed on insulated conductors
27 Figure 4 – Typical electrical test loop for branchconnectors installed on insulated conductors
28 Figure 5 – Typical cases of resistance measurements
29 7 Mechanical test
7.1 General
7.2 Method
7.3 Requirements
8 Test reports
8.1 General
8.2 Electrical tests
Table 4 – Selection of tensile force withstand values for the mechanical test
30 8.3 Mechanical test
31 Annex A (normative)Equalizers and their preparation
A.1 Requirements for equalizers
A.2 Recommendations for welding equalizers
32 Figure A.1 – Preparation of equalizers
33 Annex B (normative)Measurements
B.1 Potential measuring positions for typical connectors
B.2 Temperature measurement
B.3 Equivalent conductor resistance
34 Annex C (informative)Recommendations to decrease uncertainties of measurement
C.1 Handling the test loop
C.2 Measurements, instruments and readings
35 Annex D (normative)Calculation of adiabatic short-circuit current
Table D.1 – Material properties
36 Annex E (informative)Determination of the value of the short-circuit current
Figure E.1 – Determination of equivalent RMS valueof current during the short-circuit test
37 Annex F (normative)Calculation method
F.1 General
F.2 Measurements made
F.3 Connector resistance factor k
38 F.4 Initial scatter δ
F.5 Mean scatter β
39 Figure F.1 – Graphic example of assessment of a Class A individual connector
40 F.6 Change in resistance factor of each connector
F.6.1 General
F.6.2 Line of best fit
F.6.3 Confidence interval δi
41 F.6.4 Change in resistance factor D
F.7 Resistance factor ratio λ
F.8 Maximum temperatures θmax
42 Annex G (informative)Explanation on assessment of results of electrical tests on connectors
G.1 History
G.2 Short examination of the assessment methods of IEC 61238-1 compared with the Italian standard CEI 20-28 and the British standard BS 4579-3
43 G.3 The IEC 61238-1 method of assessing test results
44 Table G.1 – Summary of assessed behaviour of a tested connector
45 Annex H (informative)Tests on multicore connectors
H.1 Principle
H.1.1 Electrical tests
H.1.2 Mechanical tests
H.2 Test recommendations for electrical tests based on test experience in the UK and in France
H.2.1 General
46 H.2.2 Measurement
H.2.3 Heat cycling test
H.2.4 Short-circuit test (only for Class A)
47 H.2.5 Results evaluation
Figure H.1 – Test loops for through connectors
48 H.3 Test recommendations for electrical tests based on German standard DIN VDE 0220- 3
H.3.1 General
Figure H.2 – Test loops for branch connectors
49 H.3.2 Test setup for electrical test
50 H.3.3 Resistance assessment branches of the test setup
H.3.4 Temperature measurement in a separate test branch during the first and second heat-cycle
Figure H.3 – Example of test setup for multicore branch connectorson a four-core cable consisting of several test branches
52 H.3.5 Interconnection of terminals for heat-cycling
53 Figure H.4 – Example of circuit schematic for heat-cycling of multicorebranch connectors main to branch, e.g. 150/150, 150/120 or 150/95in the case of four-core cables
54 H.3.6 Short-circuit tests
Figure H.5 – Example of circuit schematic for heat-cycling of multicore branch connectors main to branch, e.g. 150/70 and smaller in the case of four-core cables
55 Figure H.6 – Example of circuit schematic in the case of four-corecable connector tests for passing short circuits on main through adjacentPhases L2–L3 with opposite current flow
56 Figure H.7 – Example of circuit schematic in the case of four-core cablebranch connector tests for short circuit test from main to branchthrough adjacent Phases L4–L1 with opposite current flow
57 H.3.7 Assessment of resistance-values Rj
58 H.3.8 Optional dielectric strength test after the electrical test
59 Annex I (informative)Load pick-up tests
Table I.1 – Minimum load pick-up
60 Bibliography

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BS EN IEC 61238-1-2:2019
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