BSI PD IEC/TS 62257-9-2:2016
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Recommendations for renewable energy and hybrid systems for rural electrification – Integrated systems. Microgrids
Published By | Publication Date | Number of Pages |
BSI | 2016 | 44 |
IEC TS 62257-9-2:2016(E) specifies microgrids made of overhead lines because of technical and economical reasons in the context of decentralized rural electrification. The microgrids covered by this part of IEC 62257 are low voltage AC, three-phase or single-phase, with rated capacity less than or equal to 100 kVA. They are powered by a single micropower plant. The main technical changes with regard to the previous edition are as follows: changing the voltage range covered by the technical specification to AC nominal voltage below 1 000 V and DC nominal voltage below 1 500 V. This publication is to be read in conjunction with /2.
PDF Catalog
PDF Pages | PDF Title |
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4 | CONTENTS |
7 | FOREWORD |
9 | INTRODUCTION |
10 | 1 Scope 2 Normative reference 3 Terms and definitions |
12 | 4 General 4.1 Limits of a microgrid 4.2 Voltage drops 4.3 Composition of a microgrid Figures Figure 1 – Microgrid limits Tables Table 1 – Maximum values of voltage drops |
13 | Figure 2 – Microgrid consisting of a single phase feeder Figure 3 – Three phase system output, single phase distribution or three phase service provided where needed Figure 4 – Three phase system output, single phase distribution |
14 | 5 Protection against electric shocks 6 Protection against overcurrents 7 Selection and erection of equipment 7.1 Equipment installation 7.2 Operational conditions and external influences 7.2.1 Ambient temperature 7.2.2 Sources of heat 7.2.3 Presence of water |
15 | 7.2.4 Risk of penetration of solid bodies 7.2.5 Corrosive or polluting substance presence 7.2.6 Mechanical requirements 7.2.7 Equipment and supporting structures 7.2.8 Vibration 7.2.9 Other mechanical constraints for underground microgrid sections |
16 | 7.2.10 Presence of flora, mold or fauna 7.2.11 Solar radiation 7.3 Characteristics of lines 7.3.1 General 7.3.2 Installation modes 7.3.3 Minimum height of conductors 7.3.4 Proximity to other services 7.4 Cables |
17 | 7.5 Poles 7.5.1 General 7.5.2 Characteristics of poles |
18 | Figure 5 – Diagram showing installation of twinned wooden poles forming an angle |
19 | 7.6 Cable anchorage Figure 6 – Examples of different pole arrangements Figure 7 – Example of an overhead line |
20 | 7.7 Connections and accessories 7.7.1 General 7.7.2 Connections between conductors, connections to other equipment 7.7.3 Connection points for individual service connections 7.7.4 Connection equipment |
21 | 7.8 Where poles are used for other purposes 7.8.1 Public lighting points 7.8.2 Telecommunication lines Figure 8 – Connection mode diagram |
22 | 7.9 Isolation and switching 7.9.1 Overcurrent protection device Table 2 – Fuse ratings for protection from short-circuiting in 230 V (and 240 V) a.c. microgrids (overhead lines) Table 3 – Fuse ratings for protection from short-circuiting in 120 V a.c. microgrids (overhead lines) Table 4 – Circuit breaker ratings for protection from short-circuiting in microgrids (overhead lines) |
23 | 7.9.2 Isolating devices 7.10 Earthing arrangement, protective conductors and protective bonding conductors Figure 9 – Microgrid earthing scheme |
24 | 8 Verification and acceptance 8.1 General 8.2 Supervision of works Table 5 – Characteristics of earthing components |
25 | 8.3 Verification before commissioning (on site acceptance) 8.4 Operation tests |
26 | Annex A (informative) Characteristics of cables Table A.1 – Example of characteristics of grid conductors for overhead lines (insulated twisted conductors without carrier neutral) (1 of 2) |
28 | Annex B (informative) Maximum circuit length |
29 | Figure B.1 – Maximum lengths as a function of active power (1 phase) for 16 mm2 cable and 6 % voltage drop with loads at end of cable |
30 | Figure B.2 – Maximum lengths as a function of active power (1 phase) for 16 mm2 cable and 6 % voltage drop with loads spread across cable |
31 | Figure B.3 – Maximum lengths as a function of active power (1 phase) for 25 mm2 cable and 6 % voltage drop with loads at end of cable |
32 | Figure B.4 – Maximum lengths as a function of active power (1 phase) for 25 mm2 cable and 6 % voltage drop with loads spread across cable |
33 | Figure B.5 – Maximum lengths as a function of active power (3 phase) for 35 mm2 cable and 6 % voltage drop with loads at end of cable |
34 | Figure B.6 – Maximum lengths as a function of active power (3 phase) for 35 mm2 cable and 6 % voltage drop with loads spread across cable |
35 | Figure B.7 – Maximum lengths as a function of active power (3 phase) for 35 mm2 cable and 3 % voltage drop with loads at end of cable |
36 | Figure B.8 – Maximum lengths as a function of active power (3 phase) for 50 mm2 cable and 6 % voltage drop with loads at end of cable |
37 | Figure B.9 – Maximum lengths as a function of active power (3 phase) for 50 mm2 cable and 6 % voltage drop with loads spread across cable |
38 | Figure B.10 – Maximum lengths as a function of active power (3 phase) for 50 mm2 cable and 3 % voltage drop with loads at end of cable |
39 | Figure B.11 – Maximum lengths as a function of active power (3 phase) for 70 mm2 cable and 6 % voltage drop with loads at end of cable |
40 | Figure B.12 – Maximum lengths as a function of active power (3 phase) for 70 mm2 cable and 6 % voltage drop with loads spread across cable |
41 | Figure B.13 – Maximum lengths as a function of active power (3 phase) for 70 mm2 cable and 3 % voltage drop with loads at end of cable |