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BS EN IEC 60664-1:2020

BS EN IEC 60664-1:2020

$215.11

Insulation coordination for equipment within low-voltage supply systems – Principles, requirements and tests

Published By Publication Date Number of Pages
BSI 2020 88
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This part of IEC 60664 deals with insulation coordination for equipment having a rated voltage up to AC 1 000 V or DC 1 500 V connected to low-voltage supply systems.

This document applies to frequencies up to 30 kHz.

NOTE 1 Requirements for insulation coordination for equipment within low-voltage supply systems with rated frequencies above 30 kHz are given in IEC 60664-4.

NOTE 2 Higher voltages can exist in internal circuits of the equipment.

It applies to equipment for use up to 2 000 m above sea level and provides guidance for use at higher altitudes (See 5.2.3.4).

It provides requirements for technical committees to determine clearances, creepage distances and criteria for solid insulation. It includes methods of electrical testing with respect to insulation coordination.

The minimum clearances specified in this document do not apply where ionized gases are present. Special requirements for such situations can be specified at the discretion of the relevant technical committee.

This document does not deal with distances:

  • through liquid insulation;

  • through gases other than air;

  • through compressed air.

This basic safety publication focusing on safety essential requirements is primarily intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 104 and ISO/IEC Guide 51.

One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications.

However, in case of missing specified values for clearances, creepage distances and requirements for solid insulation in the relevant product standards, or even missing standards, this document applies.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
11 FOREWORD
13 1 Scope
2 Normative references
14 3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
20 3.2 Abbreviated terms
4 Basic technical characteristics for insulation coordination
4.1 General
21 4.2 Voltages
4.2.1 General aspects
22 4.2.2 Transient overvoltages
23 4.2.3 Temporary overvoltages
4.2.4 Recurring peak voltage
24 4.2.5 Steady-state working voltage
4.2.6 Steady-state peak voltage
4.3 Overvoltage categories
4.3.1 General
4.3.2 Equipment energized directly from the mains supply
Figures
Figure 1 – Recurring peak voltage
25 4.3.3 Systems and equipment not energized directly from the mains supply
4.4 Frequency
4.4.1 General
4.4.2 Solid insulation
4.5 Pollution
4.5.1 General
26 4.5.2 Degrees of pollution in the micro-environment
4.5.3 Conditions of conductive pollution
4.6 Insulating material
4.6.1 Solid insulation
27 4.6.2 Stresses
28 4.6.3 Comparative tracking index (CTI)
29 4.7 Environmental aspects
4.7.1 General
4.7.2 Altitude
4.7.3 Temperature
4.7.4 Vibrations
4.7.5 Humidity
4.8 Duration of voltage stress
30 4.9 Electrical field distribution
5 Design for insulation coordination
5.1 General
5.1.1 Means of insulation coordination
5.1.2 Frequency above 30 kHz
5.1.3 Reduced distances due to coating or potting
5.1.4 Equipment which are not connected to public low-voltage systems.
5.2 Dimensioning of clearances
5.2.1 General
31 5.2.2 Dimensioning criteria for clearances
5.2.3 Other factors involving clearances
32 5.2.4 Dimensioning of clearances of functional insulation
5.2.5 Dimensioning of clearances of basic insulation, supplementary insulation and reinforced insulation
33 5.3 Dimensioning of creepage distances
5.3.1 General
34 5.3.2 Dimensioning criteria of creepage distances
35 5.3.3 Other factors involving creepage distances
36 5.3.4 Dimensioning of creepage distances of functional insulation
5.3.5 Dimensioning of creepage distances of basic insulation, supplementary insulation and reinforced insulation
Figure 2 – Determination of the width (W) and height (H) of a rib
37 5.4 Requirements for design of solid insulation
5.4.1 General
5.4.2 Voltage stress
5.4.3 Withstand of voltage stresses
39 5.4.4 Withstand on environmental stresses
6 Tests and measurements
6.1 General
40 6.2 Verification of clearances
6.2.1 General
6.2.2 Test voltages
42 6.3 Verification of creepage distances
6.4 Verification of solid insulation
6.4.1 General
43 6.4.2 Selection of tests
44 6.4.3 Conditioning
6.4.4 Impulse voltage test
45 6.4.5 AC power frequency voltage test
6.4.6 Partial discharge test
47 6.4.7 DC voltage test
Figure 3 – Test voltages
48 6.4.8 High-frequency voltage test
6.5 Performing dielectric tests on complete equipment
6.5.1 General
6.5.2 Parts to be tested
49 6.5.3 Preparation of equipment circuits
6.5.4 Test voltage values
6.5.5 Test criteria
6.6 Other tests
6.6.1 Test for purposes other than insulation coordination
6.6.2 Sampling and routine tests
6.6.3 Measurement accuracy of test parameters
50 6.7 Measurement of the attenuation of the transient overvoltages
6.8 Measurement of clearances and creepage distances
51 Figure 4 – Across the groove
Tables
Table 1 – Dimensioning of grooves
52 Figure 5 – Contour of the groove
Figure 6 – Contour of the groove with angle
Figure 7 – Contour of rib
53 Figure 8 – Uncemented joint with grooves less than X
Figure 9 – Uncemented joint with grooves equal to or more than X
54 Figure 10 – Uncemented joint with a groove on one side less than X
Figure 11 – Creepage distance and clearance through an uncemented joint
Figure 12 – Creepage distance and clearance to a head of screw more than X
55 Figure 13 – Creepage distance and clearance to a head of screw less than X
Figure 14 – Creepage distance and clearance with conductive floating part
56 Annexes
Annex A (informative) Basic data on withstand characteristics of clearances
Table A.1 – Withstand voltages for an altitude of 2 000 m above sea level (1 of 2)
57 Table A.2 – Altitude correction factors for clearance correction
58 Figure A.1 – Withstand voltage at 2 000 m above sea level
59 Figure A.2 – Experimental data measured at approximately sea level and their low limits for inhomogeneous field
60 Figure A.3 – Experimental data measured at approximately sea level and their low limits for homogeneous field
61 Annex B (informative) Nominal voltages of mains supply for different modes of overvoltage control
Table B.1 – Inherent control or equivalent protective control
62 Table B.2 – Cases where protective control is necessary and control is provided by surge protective device having a ratio of voltage protection level to rated voltagenot smaller than that specified in IEC 61643 (all parts)
63 Annex C (normative) Partial discharge test methods
C.1 Test circuits
C.1.1 General
C.1.2 Test circuit for earthed test specimen (Figure C.1)
Figure C.1 – Earthed test specimen
64 C.1.3 Test circuit for unearthed test specimen (Figure C.2)
C.1.4 Selection criteria
C.1.5 Measuring impedance
C.1.6 Coupling capacitor Ck
C.1.7 Filter
C.2 Test parameters
C.2.1 General
Figure C.2 – Unearthed test specimen
65 C.2.2 Requirements for the test voltage
C.2.3 Climatic conditions
C.3 Requirements for measuring instruments
C.3.1 General
C.3.2 Classification of PD meters
66 C.3.3 Bandwidth of the test circuit
C.4 Calibration
C.4.1 Calibration of discharge magnitude before the noise level measurement
67 C.4.2 Verification of the noise level
Figure C.3 – Calibration for earthed test specimen
Figure C.4 – Calibration for unearthed test specimen
68 C.4.3 Calibration for the PD test
C.4.4 Calibration pulse generator
69 Annex D (informative) Additional information on partial discharge test methods
D.1 Measurement of partial discharge (PD), PD inception and extinction voltage
D.2 Description of PD test circuits (Figure D.1)
Figure D.1 – Partial discharge test circuits
70 D.3 Precautions for reduction of noise
D.3.1 General
D.3.2 Sources in the non-energized test circuit
D.3.3 Sources in the energized test circuit
D.3.4 Measures for reduction of noise
D.4 Application of multiplying factors for test voltages
D.4.1 General
71 D.4.2 Example 1 (circuit connected to mains supply)
D.4.3 Example 2 (internal circuit with maximum recurring peak voltage Urp)
72 Annex E (informative) Comparison of creepage distances specified in Table F.5 and clearances in Table A.1
Figure E.1 – Comparison between creepage distances specifiedin Table F.5 and clearances in Table A.1
73 Annex F (normative) Tables
Table F.1 – Rated impulse withstand voltage for equipment energized directly from the mains supply
74 Table F.2 – Clearances to withstand transient overvoltages
75 Table F.3 – Single-phase three-wire or two-wire AC or DC systems
76 Table F.4 – Three-phase four-wire or three-wire AC systems
77 Table F.5 – Creepage distances to avoid failure due to tracking (1 of 2)
79 Table F.6 – Test voltages for verifying clearances only at different altitudes
Table F.7 – Severities for conditioning of solid insulation
80 Table F.8 – Dimensioning of clearances to withstand steady-state peak voltages, temporary overvoltages or recurring peak voltages b
Table F.9 – Additional information concerning the dimensioning of clearances to avoid partial discharge
81 Table F.10 – Altitude correction factors for clearance correction
82 Annex G (informative) Determination of clearance distances according to 5.2
Figure G.1 – Determination of clearance distances according to 5.2 (1 of 2)
84 Annex H (informative) Determination of creepage distances according to 5.3
Figure H.1 – Determination of creepage distances according to 5.3 (1 of 2)
86 Bibliography

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BS EN IEC 60664-1:2020
$215.11