kSIST FprEN IEC 62991:2022
(Main)Particular requirements for Source-Switching Equipment (SSE)
Particular requirements for Source-Switching Equipment (SSE)
This International Standard applies to Source Switching Equipment, hereafter referred to as SSE(s), for household and similar uses, primarily intended to be used for Energy Efficiency purposes with local production and/or storage of energy.
This standard has been drafted following principles of:
- IEC guides 118 and 119 for Energy Efficiency;
- IEC guide 110 for safety.
SSEs are intended to be installed in low voltage prosumer electrical installations (PEI) to deliver the electrical energy:
- either to current-using equipment (direct feeding mode or island mode);
- or to the grid (reverse feeding mode).
SSEs are intended to select and/or combine two power sources (e.g. selected among grid, local power source, storage units) within an Electrical Energy Management system (EEMS). SSEs may also be used for backup supply.
NOTE SSEs capable to select more than two sources are under consideration.
SSEs are part of the fixed electrical installation.
This standard applies to SSEs for operation in:
- AC single or multiphase circuits with rated voltages not exceeding 440 V AC, frequencies of 50 Hz, 60 Hz or 50/60 Hz and rated currents not exceeding 125 A. They are intended to be used in installations with prospective short circuit current not exceeding 25 000 A, or
- DC circuits. SSE for DC circuits are under consideration (next edition).
SSEs may be operated:
- manually (M-SSE), or
- remotely (R-SSE), or
- automatically (A-SSE), or
- a combination of the above methods of operation, e.g. manual and remote.
SSEs are constructed either as Combined-SSEs (C-SSEs, based on dedicated products suc as circuit breakers, switches or contactors) or Non-Combined SSEs (NC-SSEs).
SSEs are intended for use in circuits where protection against electrical shock and over-current according to IEC 60364 is provided, unless the SSE already contains such protective function.
SSEs are normally installed by instructed persons (IEC 60050-195:1998, 195-04-02) or skilled persons (IEC 60050-195:1998, 195-04-01). SSEs are normally used by ordinary persons (IEC 60005-195:1998, 195-04-03) and do not require maintenance.
The requirements of this standard apply for standard environmental 420 conditions as given in clause 7. They are applicable to SSEs intended for use in an environment with pollution degree 2 and overvoltage categories III according to IEC 60664-1:2020. SSEs have at least a degree of protection IP 20 according to IEC 60529. Additional requirements may be necessary for devices used in locations having more severe environmental conditions.
SSEs do not, by their nature, provide an isolation function nor the overcurrent protection. However, isolation and overcurrent protection functions as covered by relevant product standards may be provided by Combined SSEs.
In some countries, it is not permitted to have synchronization of local sources with the grid for particular grid conditions, e.g. when fluctuations of the grid voltage or frequency are outside the tolerance limits.
This document does not apply to transfer switching equipment (TSE) intended to be used by skilled persons, as covered by IEC 60947-6-1:2021.
Besondere Anforderungen an Quellenumschalteinrichtungen (SSE)
Exigences particulières relatives au matériel de commutation de source (SSE)
L'IEC 62291:2022 s'applique au matériel de commutation de source, ci-après dénommé "SSE", destiné à un usage domestique ou analogue, essentiellement prévu pour être utilisé pour les besoins de l'efficacité énergétique (EE) avec la production locale et/ou le stockage local de l'énergie.
Le SSE est destiné à être installé dans des installations électriques de prosommateurs (PEI - prosumer electrical installation) à basse tension pour délivrer l'énergie électrique:
- au matériel d'utilisation (mode d'alimentation directe ou mode en réseau séparé);
- ou au réseau (mode d'alimentation inverse).
Posebne zahteve za opremo za preklapljanje virov (SSE)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 62991:2021
01-september-2021
Posebne zahteve za opremo za preklapljanje virov (SSE)
Particular requirements for Source-Switching Equipment (SSE)
Exigences particulières relatives au matériel de commutation de source (SSE)
Ta slovenski standard je istoveten z: prEN IEC 62991:2021
ICS:
27.015 Energijska učinkovitost. Energy efficiency. Energy
Ohranjanje energije na conservation in general
splošno
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
oSIST prEN IEC 62991:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN IEC 62991:2021
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oSIST prEN IEC 62991:2021
23K/60/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 62991 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2021-06-18 2021-09-10
SUPERSEDES DOCUMENTS:
23K/50/CD, 23K/58A/CC
IEC SC 23K : ELECTRICAL ENERGY EFFICIENCY PRODUCTS
SECRETARIAT: SECRETARY:
France Mr Philippe Vollet
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
TC 23,TC 64,SC 121A
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.
TITLE:
Particular requirements for Source-Switching Equipment (SSE)
PROPOSED STABILITY DATE: 2024
NOTE FROM TC/SC OFFICERS:
After resolution of 23K/50/CD comments, officiers support the circulation of this CVD.
Copyright © 2021 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to
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 any other purpose without permission in writing from IEC.
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oSIST prEN IEC 62991:2021
62991/Ed.1/CDV © IEC(E) 2 23K/60/CDV
1 CONTENTS
2
3 FOREWORD . 8
4 INTRODUCTION . 10
5 1 Scope . 12
6 2 Normative references . 13
7 3 Terms and definitions . 15
8 3.1 General definitions . 15
9 3.2 Additional definitions for Non-Combined SSEs and SSE control units
10 (controllers) of Combined SSEs . 26
11 3.3 Additional definitions dedicated to Combined SSE . 27
12 4 Classification . 28
13 4.1 According to the method of operation . 28
14 4.2 According to the construction . 28
15 4.3 According to the kind of current . 29
16 4.4 According to the number of switched poles . 29
17 4.5 According to the type of terminals . 29
18 4.6 According to the SSE intended application . 29
19 4.7 According to coupling method . 29
20 4.7.1 SSE with synchronization . 29
21 4.7.2 SSE with interlock . 29
22 4.7.3 SSE with synchronization and interlock. 29
23 4.8 According to the transition type . 29
24 4.9 According to the possibility to select sources . 29
25 4.10 According to the utilization category . 29
26 4.11 According to the possibility to provide an OFF-position . 30
27 4.12 According to the method of mounting . 30
28 4.13 According to the protection against external influences . 30
29 4.14 According to functional categories . 30
30 5 Characteristics . 32
31 5.1 General . 32
32 5.2 Type and characteristics of the equipment . 33
33 5.3 Characteristics of Non-Combined SSEs . 33
34 5.3.1 General . 33
35 5.3.2 Characteristics of main circuits . 34
36 5.3.3 Utilization categories . 35
37 5.3.4 Characteristics of control circuits, including electrical interlocks . 36
38 5.3.5 Characteristics of auxiliary circuits . 37
39 5.4 Characteristics of Combined SSEs . 38
40 5.4.1 General . 38
41 5.4.2 Characteristics of main circuits . 38
42 5.4.3 Utilization categories . 39
43 5.4.4 Characteristics of control circuits, including electrical interlocks . 39
44 5.4.5 Characteristics of auxiliary circuits . 39
45 6 Markings and product information . 39
46 7 Standard conditions for operation in service . 41
47 7.1 General . 41
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48 7.2 Ambient temperature range in normal use . 41
49 7.3 Relative humidity . 41
50 7.4 Altitude . 42
51 7.5 Conditions of installation . 42
52 7.6 Pollution degree . 42
53 8 Requirements for construction and operation . 42
54 8.1 General . 42
55 8.2 Mechanical design . 43
56 8.2.1 General . 43
57 8.2.2 Constructional requirements . 43
58 8.2.3 Mechanism and operating means . 45
59 8.2.4 Clearances and creepage distances and distances through sealing
60 compound . 46
61 8.2.5 Screws, current-carrying parts and connections . 49
62 8.2.6 Terminals for external copper conductors . 51
63 8.3 Protection against electric shock . 52
64 8.4 Dielectric properties . 52
65 8.4.1 General . 52
66 8.4.2 Dielectric properties . 52
67 8.5 Temperature-rise . 52
68 8.6 Making and breaking capacity . 54
69 8.7 Performances . 55
70 8.7.1 General . 55
71 8.7.2 Operating conditions . 55
72 8.7.3 Operational performance . 58
73 8.8 Resistance to heat . 59
74 8.9 Resistance of insulating material to abnormal heat and to fire . 59
75 8.10 Resistance to rusting . 59
76 8.11 Coordination with short circuit protective devices (SCPDs) . 59
77 8.12 EMC . 59
78 8.13 Resistance to abnormal conditions . 60
79 8.14 Components . 60
80 8.14.1 General . 60
81 8.14.2 Fuses . 60
82 8.14.3 Capacitors . 60
83 8.14.4 Resistors . 61
84 8.14.5 Transformers . 61
85 9 Type tests . 62
86 9.1 General requirements . 62
87 9.1.1 Type tests and test sequences . 62
88 9.1.2 Tests conditions . 62
89 9.1.3 Tests procedure. 62
90 9.2 Tests of indelibility of markings . 63
91 9.3 Tests of the mechanical strength . 63
92 9.3.1 Tests of the resistance to mechanical stresses of insulating means . 63
93 9.3.2 Verification of installation and connections . 72
94 9.3.3 Tests of fixings of covers, cover plates and actuating members . 74
95 9.3.4 Tests of attachment of knobs . 76
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96 9.3.5 Tests of covers, cover plates or actuating members - accessibility to
97 live parts . 76
98 9.3.6 Tests of covers, cover plates or actuating members – accessibility to
99 non-earthed metal parts separated from live parts . 77
100 9.3.7 Tests of covers, cover plates or actuating members – accessibility to
101 insulating parts, earthed metal parts, the live parts of SELV ≤ 25 V AC
102 or metal parts separated from live parts . 77
103 9.3.8 Tests of covers, cover plates or actuating members – application of
104 gauges . 77
105 9.3.9 Tests of grooves, holes and reverse tapers . 79
106 9.4 Measurements of clearances and creepage distances . 80
107 9.5 Verification of the reliability of screws, current-carrying parts and
108 connections . 81
109 9.6 Verification of reliability of terminals for external copper conductors . 81
110 9.6.1 Tests of screw-type terminals . 81
111 9.6.2 Tests of screwless terminals . 91
112 9.6.3 Verification of the resistance to ageing . 100
113 9.7 Tests for the protection against electric shock . 100
114 9.8 Tests of dielectric properties . 103
115 9.8.1 General . 103
116 9.8.2 Tests of the resistance to humidity . 103
117 9.8.3 Tests of the insulation resistance of the main circuits . 103
118 9.8.4 Tests of the dielectric strength of main circuits . 104
119 9.8.5 Tests of the insulation resistance and dielectric strength of other
120 circuits . 106
121 9.8.6 Verification of impulse withstand voltages (across clearances and
122 through solid insulations) . 107
123 9.9 Tests of temperature-rise . 109
124 9.9.1 General . 109
125 9.9.2 Test setup . 109
126 9.9.3 Test procedure . 111
127 9.10 Tests of making and breaking capacity . 111
128 9.11 Verification of performances . 112
129 9.11.1 General . 112
130 9.11.2 Verification of interlocking function . 112
131 9.11.3 Verification of controls, sequences and limits of operations . 115
132 9.11.4 Verification of the operational performance capability . 119
133 9.12 Tests of heat resistance . 120
134 9.12.1 Basic heating test . 120
135 9.12.2 Ball-pressure test on parts of insulating material necessary to retain
136 current-carrying parts and parts of the earthing circuit in position . 120
137 9.12.3 Ball-pressure test on parts of insulating material not necessary to retain
138 current-carrying parts and parts of the earthing circuit in position . 121
139 9.13 Tests of the resistance of insulating material to abnormal heat and to fire . 121
140 9.14 Resistance to rusting . 124
141 9.15 Tests of coordination with short circuit protective devices (SCPDs) . 124
142 9.15.1 General . 124
143 9.15.2 Test conditions . 124
144 9.15.3 Tests of coordination between the SSE and the SCPDs . 129
145 9.16 EMC tests . 130
146 9.16.1 General . 130
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147 9.16.2 Electromagnetic emission . 130
148 9.16.3 Electromagnetic immunity . 130
149 9.17 Tests under abnormal conditions . 134
150 9.17.1 General . 134
151 9.17.2 Tests under fault conditions . 134
152 9.17.3 Overload tests . 135
153 Annex A (informative) Examples of possible use of SSEs . 137
154 A.1 General concept of prosumer’s low-voltage electrical installation . 137
155 A.2 Examples of SSE use . 140
156 Annex B (informative) Correspondence between ISO and AWG copper conductors . 145
157 Annex C (normative) Determination of clearances and creepage distances . 146
158 C.1 General . 146
159 C.2 Orientation and location of a creepage distance . 146
160 C.3 Creepage distances where more than one material is used . 146
161 C.4 Creepage distances split by floating conductive part . 146
162 C.5 Measurement of creepage distances and clearances . 146
163 Annex D (normative) Test sequences and number of specimens . 150
164 Annex E (normative) Arrangement for the detection of the emission of ionized gases
165 during short-circuit tests . 152
166 Bibliography . 155
167
168 Figure 1 – Energy Efficiency Management System (EEMS) . 10
169 Figure 2 – Principle of management of 2 sources with a Source Switching Equipment
170 (SSE) . 11
171 Figure 3 – Example of A-SSE . 31
172 Figure 4 – Example of R-SSE . 32
173 Figure 5 – Example of M-SSE . 32
174 Figure 6 – Thread-cutting screw . 49
175 Figure 7 – Thread-forming screw . 50
176 Figure 8 – Pendulum impact test apparatus . 64
177 Figure 9 – Pendulum impact test apparatus (striking element) . 65
178 Figure 10 – Mounting support of specimens . 66
179 Figure 11 – Mounting block for a flush type SSE . 67
180 Figure 12 – Example of mounting support of a panel board type SSE . 68
181 Figure 13 – Example of mounting support for a rear fixed SSE . 69
182 Figure 14 – Application of forces on a rail-mounted SSE . 71
183 Figure 15 – Determination of the direction of the forces to be applied . 73
184 Figure 16 – Direction for the conductor pull of 30 N for 1 min . 74
185 Figure 17 – Gauge (thickness: about 2 mm) for the verification of the outline of covers,
186 cover-plates or actuating members . 77
187 Figure 18 – Example of application of the gauge of Figure 17 on covers fixed without
188 screws on a mounting surface or supporting surface . 78
189 Figure 19 – Examples of applications of the gauge of Figure 17 . 79
190 Figure 20 – Gauge for verification of grooves, holes and reverse tapers . 80
191 Figure 21 – Sketch showing the direction of application of the gauge of Figure 20 . 80
192 Figure 22 – Terminals with stirrup . 82
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193 Figure 23 – Pillar terminals . 83
194 Figure 24 – Screw terminals and stud terminals . 84
195 Figure 25 – Saddle terminals . 85
196 Figure 26 – Lug terminals . 86
197 Figure 27 – Test apparatus for checking damage to conductors . 95
198 Figure 28 – Information for deflection test . 98
199 Figure 29 – Joined test finger . 101
200 Figure 30 – Test pin for checking the protection against electric shock . 103
201 Figure 31 – Actuator test force . 114
202 Figure 32 – Test circuit for connection to source 1 and source 2 . 116
203 Figure 33 – Ball-pressure test apparatus . 121
204 Figure 34 – Diagrammatic representation. 122
205 Figure 35 – Typical diagram for all coordination tests . 125
206 Figure 36 – Detail of impedances Z and Z . 126
1
207 Figure A.1 – Exampleof PEI . 138
208 Figure A.2 – Example of an individual PEI . 139
209 Figure A.3 – Example of a shared PEI with a distribution system within the PEI in
210 parallel of the DSO distribution system . 140
211 Figure A.4 – Example of SSE use in an individual PEI with PV production and storage
212 on the DC side . 141
213 Figure A.5 – Example of SSE use in an individual PEI with PV production and storage
214 on the AC side . 142
215 Figure A.6 – Example of SSE use for power backup with storage or a generator set . 143
216 Figure A.7 – Example of SSE use for power backup with only storage . 144
217 Figure C.1 – Example 1 . 147
218 Figure C.2 – Example 2 . 147
219 Figure C.3 – Example 3 . 147
220 Figure C.4 – Example 4 . 148
221 Figure C.5 – Example 5 . 148
222 Figure C.6 – Example 6 . 148
223 Figure C.7 – Example 7 . 149
224 Figure E.1 – Test arrangement . 153
225 Figure E.2 – Grid . 154
226 Figure E.3 – Grid circuit . 154
227
228 Table 1 – Source switching functional categories . 30
229 Table 2 – Preferred values of rated voltages . 34
230 Table 3 – Rated impulse voltage as a function of the nominal voltage of the installation . 35
231 Table 4 – Utilization categories .
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