General requirements for residual current operated protective devices for DC system

IEC TS 63053:2017(E) provides general minimum requirements, recommendations and information for the drafting and testing procedures of standards for residual current operated protective devices, intended to be used in DC systems having a rated voltage not exceeding 400 V DC and a rated current not exceeding 125 A, hereafter referred to as DC-RCDs.

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Status
Published
Publication Date
28-Jun-2017
Current Stage
PPUB - Publication issued
Start Date
29-Jun-2017
Completion Date
29-Jun-2017
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IEC TS 63053
Edition 1.0 2017-06
TECHNICAL
SPECIFICATION
General requirements for residual current operated protective devices
for DC systems
IEC TS 63053:2017-06(en)
---------------------- Page: 1 ----------------------
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IEC TS 63053
Edition 1.0 2017-06
TECHNICAL
SPECIFICATION
General requirements for residual current operated protective devices
for DC systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.50 ISBN 978-2-8322-4526-2

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC TS 63053:2017 © IEC 2017
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 9

3 Terms and definitions .................................................................................................... 10

4 Classification ................................................................................................................. 11

4.1 According to the type of installation ...................................................................... 11

4.2 According to the possibility of adjusting the residual operating current .................. 11

4.3 According to time-delay (in presence of a residual current) ................................... 11

4.4 According to the protection against external influences ......................................... 12

4.5 According to the method of mounting .................................................................... 12

4.6 According to the method of connection ................................................................. 12

4.7 According to the type of terminals ......................................................................... 12

4.8 According to the number of poles and current paths .............................................. 12

4.9 According to the instantaneous tripping current ..................................................... 13

4.10 According to the I²t characteristics ........................................................................ 13

4.11 According to overcurrent protection ....................................................................... 13

4.12 According to the method of construction ............................................................... 13

4.13 According to the range of ambient air temperature ................................................ 13

4.14 According to the time constant .............................................................................. 13

4.15 According to the current direction through the poles.............................................. 13

5 Characteristics of residual current devices ..................................................................... 14

5.1 Summary of characteristics ................................................................................... 14

5.2 Rated quantities and other characteristics ............................................................. 14

5.2.1 Rated voltages .............................................................................................. 14

5.2.2 Rated direct current (I ) ................................................................................ 14

5.2.3 Rated making and breaking capacity (I ) ...................................................... 14

5.2.4 Rated residual operating direct current (I ) ................................................. 15

5.2.5 Rated residual non-operating direct current (I ) ......................................... 15

∆no

5.2.6 Rated residual direct making and breaking capacity (I ) ............................. 15

5.2.7 Rated conditional direct short-circuit current (I ) .......................................... 15

5.2.8 Rated conditional residual direct short-circuit current (I ) ............................ 15

5.2.9 Time-delay DC-RCD ...................................................................................... 15

5.2.10 Operating characteristics ............................................................................... 15

5.3 Standard and preferred values .............................................................................. 15

5.3.1 Preferred values of rated operational voltage (U ) ......................................... 15

5.3.2 Preferred values of rated current (I ) ............................................................. 16

5.3.3 Standard values of rated residual operating direct current (I ) ..................... 16

5.3.4 Standard value of residual non-operating direct current (I ) ....................... 16

∆no

5.3.5 Standard values of rated impulse withstand voltage (U ) ........................... 16

imp

5.3.6 Standard values of operating time ................................................................. 17

5.3.7 Minimum value of the rated making and breaking capacity (I ) ..................... 18

5.3.8 Minimum value of the rated residual direct making and breaking

capacity (I ) ............................................................................................... 18

5.4 Coordination with short-circuit protective devices (SCPDs) ................................... 18

5.4.1 General ......................................................................................................... 18

5.4.2 Preferred values of the rated conditional direct short-circuit current (I )....... 18

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IEC TS 63053:2017 © IEC 2017 – 3 –
5.4.3 Preferred values of the rated conditional residual direct short-circuit

current (I ) .................................................................................................. 18

6 Marking and other product information ........................................................................... 19

7 Conditions for operation in service and for installation ................................................... 20

7.1 Preferred ranges of application, reference values of influencing

quantities/factors and associated test tolerances .................................................. 20

7.2 Conditions of installation ....................................................................................... 21

7.3 Pollution degree .................................................................................................... 21

8 Requirements for construction and operation ................................................................. 21

8.1 Mechanical design ................................................................................................ 21

8.1.1 General ......................................................................................................... 21

8.1.2 Mechanism .................................................................................................... 22

8.1.3 Clearance and creepage distances ................................................................ 23

8.1.4 Screws, current-carrying parts and connections ............................................. 23

8.1.5 Terminals for external conductors .................................................................. 24

8.2 Protection against electric shock ........................................................................... 24

8.3 Dielectric properties and isolating capability .......................................................... 24

8.4 Temperature-rise .................................................................................................. 24

8.5 Operating characteristics ...................................................................................... 25

8.5.1 General ......................................................................................................... 25

8.5.2 Operation in response to a residual current equal to and greater than

I ................................................................................................................ 25

8.5.3 Operation in response time in presence of a residual current equal to

and greater than I ...................................................................................... 25

8.6 Mechanical and electrical endurance .................................................................... 25

8.7 Performance at short-circuit currents .................................................................... 25

8.8 Resistance to mechanical shock and impact ......................................................... 26

8.9 Resistance to heat ................................................................................................ 26

8.10 Resistance to abnormal heat and to fire ................................................................ 26

8.11 Test device ........................................................................................................... 26

8.12 Requirements for DC-RCDs in case of loss of supply ............................................ 26

8.13 Behaviour of DC-RCDs in case of overcurrent in the main circuit .......................... 27

8.14 Behaviour of DC-RCDs in the case of current surges caused by impulse

voltages ................................................................................................................ 27

8.15 Void ...................................................................................................................... 27

8.16 Reliability .............................................................................................................. 27

8.17 Electromagnetic compatibility (EMC) ..................................................................... 27

8.18 Resistance to temporary overvoltages (TOVs) ...................................................... 27

8.19 Performance of DC-RCDs at inrush currents ......................................................... 28

9 Preparation of test clauses for DC-RCDs product standard ............................................ 28

9.1 General ................................................................................................................. 28

9.1.1 General test conditions .................................................................................. 28

9.1.2 Test clauses not specified in this document ................................................... 28

9.2 Operating characteristics ...................................................................................... 29

9.2.1 General requirements for operating characteristics tests ................................ 29

9.2.2 Steady increase of residual current ................................................................ 29

9.2.3 Closing on a residual current ......................................................................... 29

9.2.4 Sudden appearance of residual current ......................................................... 29

9.2.5 Residual current higher than 3 I ................................................................. 29

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– 4 – IEC TS 63053:2017 © IEC 2017

9.2.6 Tests with load .............................................................................................. 29

9.2.7 Tests at the temperature limits ....................................................................... 29

9.2.8 Additional test for delay type RCDs ............................................................... 30

9.3 Tests of electrical endurance ................................................................................ 30

9.4 Tests of behaviour of the DC-RCD under short-circuit conditions .......................... 30

9.4.1 General ......................................................................................................... 30

9.4.2 Short-circuit tests .......................................................................................... 30

9.4.3 Behaviour of the DC-RCD during and after the tests ...................................... 32

9.5 Test of the trip-free mechanism ............................................................................. 33

9.6 Verification of the operation of the test device ....................................................... 33

9.7 Test of behaviour of DC-RCDs in case of current surges caused by impulse

voltages ................................................................................................................ 33

9.7.1 Current surge test for all DC-RCDs (0,5 μs/100 kHz ring wave test) ............... 33

9.7.2 Verification of behaviour with surge currents (8/20 μs surge current test) ...... 33

9.8 Tests of reliability .................................................................................................. 34

9.8.1 Climatic test................................................................................................... 34

9.8.2 Test with temperature of 40 °C ...................................................................... 34

9.9 Verification of ageing of electronic components .................................................... 35

9.10 Tests of electromagnetic compatibility (EMC) ........................................................ 35

9.10.1 General ......................................................................................................... 35

9.10.2 General requirements .................................................................................... 36

9.10.3 Specific requirements on ripple immunity ....................................................... 38

9.10.4 Verification of behaviour during inrush currents ............................................. 38

Annex A (informative) Recommended diagram for short-circuit tests .................................... 42

Bibliography .......................................................................................................................... 45

Figure 1 – Damped oscillator current wave 0,5 µs/100 kHz ................................................... 39

Figure 2 – Examples of installation ....................................................................................... 40

Figure 3 – Downstream circuit for simulating inrush currents................................................. 41

Figure 4 – Example of test circuit for verification of ageing of electronic components ............ 41

Figure A.1 – Diagram for all the short-circuit tests................................................................. 43

Figure A.2 – Detail of impedance Z or Z .............................................................................. 44

Table 1 – Preferred values of rated operational voltage (U )................................................. 16

Table 2 – Standard values of maximum break time for non-time-delay DC-RCDs .................. 17

Table 3 – Standard values of break time and non-actuating time for time-delay DC-

RCDs .................................................................................................................................... 17

Table 4 – Marking for DC-RCDs ............................................................................................ 19

Table 5 – Values of influencing quantities ............................................................................. 21

Table 6 – Tripping current limits ............................................................................................ 25

Table 7 – Withstand values and duration of temporary overvoltages ..................................... 27

Table 8 – List of electromagnetic phenomena covered by IEC 61543 .................................... 37

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IEC TS 63053:2017 © IEC 2017 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GENERAL REQUIREMENTS FOR RESIDUAL CURRENT OPERATED
PROTECTIVE DEVICES FOR DC SYSTEMS
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

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Technical specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC TS 63053, which is a technical specification, has been prepared by subcommittee 23E:

Circuit-breakers and similar equipment for household use, of IEC technical committee 23:

Electrical accessories.
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– 6 – IEC TS 63053:2017 © IEC 2017
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
23E/1006/DTS 23E/1021/RVDTS

Full information on the voting for the approval of this technical specification can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

In this standard, the following print types are used:
– conformity statements: in italic type

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• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
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IEC TS 63053:2017 © IEC 2017 – 7 –
INTRODUCTION

In AC systems, residual current devices are used to provide protection against the risk of

electric shocks. In IEC 60364 (all parts), residual current devices are used for automatic

disconnection of supply in case of fault (see Clause 411 of IEC 60364-4-41:2005) and

residual current devices with rated residual operating current not exceeding 30 mA are used

as additional protection (see 415 of IEC 60364-4-41:2005). IEC SC 23E has developed a set

of standards for residual current operated protective devices intended to be used in AC

systems.

DC systems are used for applications such as photovoltaic installations, data centres and

telecom centres, and electric vehicle charging systems. In addition, standards for plugs and

socket-outlets for ICT equipment installed in date centres and telecom centre have been

published. Therefore, a reference document for residual current devices intended to be used

in DC supply systems is necessary.

Residual current devices for DC systems may be used to provide fault protection (automatic

disconnection of supply according to Clause 411 of IEC 60364-4-41:2005); they may also be

used to provide protection against direct contact. They provide protection against electric

shock downstream of the device in DC networks.

This document defines the operating characteristics for residual current operated protective

devices for DC systems. Details of how they should be installed to provide the desired level of

protection are specified in the various parts of the IEC 60364 series.

The operating characteristics given in this document are based on the information contained

in IEC 60479 (all parts) and the requirements in IEC 60364-4-41.

This document is intended for use by technical committees in the preparation of standards for

residual current devices. It is not intended to be used as a stand-alone document, for

example, for certification.
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– 8 – IEC TS 63053:2017 © IEC 2017
GENERAL REQUIREMENTS FOR RESIDUAL CURRENT OPERATED
PROTECTIVE DEVICES FOR DC SYSTEMS
1 Scope

This document provides general minimum requirements, recommendations and information for

the drafting and testing procedures of standards for residual current operated protective

devices, intended to be used in DC systems having a rated voltage not exceeding 400 V DC

and a rated current not exceeding 125 A, hereafter referred to as DC-RCDs.

NOTE 1 This document can also be used as a guide for DC-RCDs with voltages up to 1 500 V DC.

This document is primarily intended to be used as a reference for drafting product safety

standard for DC-RCDs.

This document cannot be used alone but is intended for use by technical committees in the

preparation of standards for products similar to those mentioned in the scope of this standard.

This document applies to a device
– which detects a residual current,
– compares it to a reference value, and

– opens the contacts or poles when the residual current exceeds this reference value.

Any association of devices, each one of them performing separately one or two of the

above-mentioned functions, but acting together in order to accomplish all three functions, is

also covered by this document.

NOTE 2 RCMs (residual current monitor according to IEC 62020) whose purpose is to monitor an electrical

installation and not to provide protection are not covered by this document and cannot be considered similar or

equivalent to DC-RCDs.

DC-RCDs are intended to provide fault protection, the exposed conductive parts of the

installation being connected to an appropriate earth electrode, in accordance with

IEC 60364-4-41.

DC-RCDs having a rated residual operating direct current not exceeding 80 mA are also used

as a provision for additional protection in case of failure of the protective means against

electric shock.

In accordance with IEC 60364-4-42, residual current devices with a rated residual operating

current not exceeding 300 mA can also be used to provide protection against fire hazards due

to a persistent earth fault current.

DC-RCDs are suitable for isolation. They are suitable for all supply systems, with the

exception of single-pole DC-RCDs with two current paths which are not suitable for use in

IT systems.

DC-RCDs of the general type are resistant to unwanted tripping including the case where

surge voltages (as a result of switching transients or induced by lightning) cause loading

currents in the installation without occurrence of flashover.

NOTE 3 Installation and application rules of RCDs are given in IEC 60364 (all parts).

NOTE 4 Surge protective devices installed downstream of DC-RCDs and connected in common mode can cause

unwanted tripping.
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IEC TS 63053:2017 © IEC 2017 – 9 –

The requirements of this document apply for normal environmental conditions (see 7.1).

Additional requirements can apply for RCDs type DC used in locations having severe

environmental conditions.

NOTE 5 For DC-RCDs having a degree of protection higher than IP 20 special constructions can be applicable.

DC-RCDs which include batteries are not covered by this document.

Specific additional requirements for RCDs incorporated or embedded in equipment are

covered in IEC TR 60755. Those specific additional requir
...

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