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BS EN IEC 60947-8:2023

BS EN IEC 60947-8:2023

$189.07

Low-voltage switchgear and controlgear – Control units for built-in thermal protection (PTC) for rotating electrical machines

Published By Publication Date Number of Pages
BSI 2023 50
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This part of IEC 60947 series specifies requirements for control units, which control a switching device in response to the PTC thermistors incorporated in rotating electrical machines and the industrial application. It specifies requirements for that type of system comprising a positive temperature coefficient (PTC) thermistor having particular characteristics, and its associated control unit. This document includes: – the characteristics, construction, performance and tests of the control unit; and – its association with a PTC thermistor designated “Mark A”. This document does not cover: – the incorporation of thermal protections into rotating machines and their maximum winding temperature. See IEC 60034-11; – use of the product within explosive atmospheres (see IEC 60079 (all parts)); – software and firmware requirements; NOTE 1 Guidance on embedded software is given in IEC TR 63201. – cyber security aspects (see IEC TS 63208). NOTE 2 It is not possible to specify all the requirements for the operating characteristics of a control unit, as they are dependent on some aspects of the PTC thermistors. Some aspects of the requirements of the thermal protector system can only be specified when account is taken of the characteristics of the rotating machine to be protected and the method of installation of the PTC thermistor within the machine.

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PDF Pages PDF Title
2 undefined
7 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
9 Annex ZZ (informative)Relationship between this European standard and the safety objectives of Directive 2014/35/EU [2014 OJ L96] aimed to be covered
10 Blank Page
11 English
CONTENTS
14 FOREWORD
16 INTRODUCTION
17 1 Scope
2 Normative references
18 3 Terms and definitions, symbols and abbreviated terms
3.1 Terms and definitions
20 3.2 Symbols and abbreviated terms
4 Void
5 Characteristics of control units for built-in thermal protection (PTC)
5.1 Summary of characteristics
5.2 Type of equipment
5.2.1 Operating temperatures of protection systems
5.2.2 Rated PTC thermistor operating temperature
21 5.2.3 Rated system operating temperature
5.2.4 Maximum permissible rated operating temperature for the system
5.2.5 Control unit with reset temperature
5.2.6 Control unit with sensor short-circuit detection
5.2.7 Control unit with sensor wire break detection
22 5.3 Rated electrical values of the switching device of the control unit
5.3.1 Rated electrical values of switching devices
5.3.2 Rated voltages of a control unit
5.3.3 Rated currents of a control unit
5.3.4 Rated making and breaking capacities of a control unit
5.4 Rated electrical values of characteristic variation related to PTC thermistors
5.4.1 General
5.4.2 Electrical data/ratings and characteristics related to the PTC thermistor
23 5.4.3 Rated voltage of the PTC thermistor circuit of the control unit
5.5 Control supply circuit
5.6 Auxiliary circuits
6 Product information
6.1 Nature of information
24 6.2 Marking
6.3 Instructions for installation, operation and maintenance, decommissioning and dismantling
6.4 Environmental information
7 Normal service, mounting and transport conditions
25 8 Constructional and performance requirements
8.1 Constructional requirements
8.1.1 General
26 8.1.2 Materials
8.1.3 Current-carrying parts and their connections
8.1.4 Clearances and creepage distances
8.1.5 Vacant
8.1.6 Vacant
8.1.7 Vacant
8.1.8 Terminals
27 8.1.9 Vacant
8.1.10 Provisions for protective earthing
8.1.11 Dedicated enclosures for equipment
8.1.12 Degrees of protection of enclosed equipment
8.1.13 Conduit pull-out, torque and bending with metallic conduits
8.1.14 Limited energy source
28 Tables
Table 1 – Limits for limited energy sources without an over-current protective device
Table 2 – Limits for limited energy sources with an over-current protective device
29 8.1.15 Stored charge energy circuit
8.1.16 Fault and abnormal conditions
Table 3 – Limits for limited energy source with current limiting impedance
30 8.1.17 Short-circuit and overload protection of ports
8.2 Performance requirements
8.2.1 Operating conditions
31 8.2.2 Abnormal conditions of service
8.2.3 Dielectric properties
8.2.4 Temperature rise
8.2.5 Conditional short-circuit current
8.2.6 Making and breaking capacities for control and auxiliary circuits
8.2.7 Additional requirements and tests for equipment with protective separation
8.2.8 Operating temperature variation
8.2.9 Damp heat
8.2.10 Shock and vibration
32 8.2.11 Requirements for short-circuit detection within the PTC thermistor circuit
8.2.12 Requirements for wire break detection within the PTC thermistor circuit
8.3 Electromagnetic compatibility (EMC)
8.3.1 General
8.3.2 Immunity
33 8.3.3 Emission
9 Tests
9.1 Kinds of tests
9.1.1 General
9.1.2 Type tests
9.1.3 Routine tests
34 9.1.4 Sampling tests
9.1.5 Special tests
9.2 Compliance with constructional requirements
9.2.1 General
9.2.2 Electrical performance of screwless-type clamping units
9.2.3 Ageing test for screwless-type clamping units
9.2.4 Limited energy source test
35 9.2.5 Breakdown of components
36 9.3 Compliance with performance requirements
9.3.1 Test sequences
37 9.3.2 General test conditions
9.3.3 Performance
40 Figures
Figure 1 – Measurement of wire break detection
41 9.3.4 Performance under conditional short-circuit current
9.4 EMC tests
9.4.1 General
9.4.2 Immunity
42 9.4.3 Emission
Table 4 – Terminal disturbance voltage limits for conductedradio-frequency emission (for control supply input)
Table 5 – Radiated emission test limits
43 9.5 Routine and sampling tests
9.5.1 General
9.5.2 Operating tests on control units
9.5.3 Dielectric tests
9.5.4 Routine verification of switch on and switch off of Mark A control units
44 Annex A (normative)PTC thermistors used in thermal protection systems
A.1 Characteristics of association of Mark A thermistors
A.2 Verification of interchangeability characteristics
A.2.1 Type tests on Mark A thermistors
45 A.2.2 Routine tests on Mark A thermistors
Figure A.1 – Characteristic curve of a typical Mark A thermistor
46 Annex B (normative)Additional requirements and tests for equipmentwith protective separation
B.1 General
B.2 Definitions
B.3 Requirements
B.3.1 Test method for implementing protective impedance
47 B.3.2 Touch current measurement
Figure B.1 – Protection by means of protective impedance
48 Figure B.2 – Measuring instrument
49 Bibliography

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BS EN IEC 60947-8:2023
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