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BSI PD IEC/TS 62257-9-2:2016

$167.15

Recommendations for renewable energy and hybrid systems for rural electrification – Integrated systems. Microgrids

Published By Publication Date Number of Pages
BSI 2016 44
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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
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
BSI PD IEC/TS 62257-9-2:2016
$167.15