BSI PD IEC TR 63282:2020
$198.66
LVDC systems. Assessment of standard voltages and power quality requirements
Published By | Publication Date | Number of Pages |
BSI | 2020 | 70 |
The purpose of this document is to collect information and report experience in order to make recommendations for the standardization of voltage levels and related aspects (power quality, EMC, measurement ā¦) for LVDC systems (systems with voltage level lower than 1 500 V d.c.).
Rationale for the proposed voltage values are given. Variation of parameters for the voltage (power quality) and recommendation for their boundaries are defined. Nevertheless, some of the technical items are not exhaustively explained in this document and some gaps are identified for future work.
Attention is paid to the definition of DC voltage.
Systems in which a unipolar voltage is interrupted periodically for certain purposes, e.g. pulse voltage, are not considered.
Traction systems are excluded from this document.
PDF Catalog
PDF Pages | PDF Title |
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2 | undefined |
4 | CONTENTS |
7 | FOREWORD |
9 | INTRODUCTION |
10 | 1 Scope 2 Normative references 3 Terms and definitions |
14 | 4 Structure of LVDC systems 4.1 General 4.2 Architecture Figures Figure 1 ā Unipolar, balanced and bipolar DC systems |
15 | 4.3 Operation modes 4.3.1 Passive DC systems 4.3.2 Active DC systems 5 LVDC voltage division 5.1 General Tables Table 1 ā Difference between unipolar and bipolar systems |
16 | 5.2 Voltage bands Figure 2 ā Voltage bands in DC systems |
17 | 5.3 Operation ranges with respect to DC voltage and time Figure 3 ā DC Voltage areas for safe interoperability |
18 | 5.4 States |
19 | 6 Power quality phenomena relevant to LVDC networks 6.1 General 6.2 Relationships between voltage band and power quality in LVDC systems |
20 | 6.3 Supply voltage deviation Figure 4 ā Relationships between voltage band and power quality in LVDC systems |
21 | 6.4 Ripple and high frequency noise |
22 | 6.5 Voltage swell Figure 5 ā Voltage swell example |
23 | 6.6 Voltage dip Figure 6 ā Voltage dip example |
24 | 6.7 Voltage supply interruption 6.8 Rapid voltage change (RVC) |
25 | 6.9 Voltage surges Figure 7 ā RVC event: example of a change in average voltagethat results in an RVC event |
26 | 6.10 Voltage unbalance Figure 8 ā Example of voltage surge |
27 | 7 Recommendations 7.1 General 7.2 Recommended voltages Figure 9 ā A schematic of a bipolar system (the CIGRE B4 DC test system) |
28 | 7.3 EMC and compatibility levels Figure 10 ā Relation between disturbance levels (schematic significance only) Table 2 ā Voltage between lines (unipolar systems)or line and midpoint (bipolar systems) Table 3 ā Voltage between lines (bipolar systems) |
29 | Figure 11 ā LVAC voltage compatibility and immunity levels |
30 | 7.4 Power quality recommendations Table 4 ā Immunity: DC input and output power ports, residential,commercial and light industrial environment Table 5 ā Immunity: DC input and output power ports ā Industrial environment |
31 | 7.5 Measurement methods 7.5.1 General 7.5.2 DC system RMS value integration time 7.5.3 DC power quality measurement methods |
32 | Annex A (informative)PQ waveforms collected from a certain LVDC project Figure A.1 ā Voltage deviation caused by load switching Figure A.2 ā Voltage ripple in steady state |
33 | Figure A.3 ā Voltage dip caused by the start-up of motor load |
34 | Annex B (informative)Load distance in DC distribution systems Table B.1 ā 1,5 (Ā±0,75) kV typical load distance of overhead DC lines Table B.2 ā 750 (Ā±375) V, 220 (Ā±110) V typical section load distance of overhead DC lines |
35 | Annex C (informative)Electric power and power quality computation in DC systems C.1 DC RMS value of voltage or current C.2 General electric power system: decomposition of a general electric load |
36 | C.3 Computation of electric powers and PQ indices Figure C.1 ā Equivalent model of a general electric load |
39 | C.4 Representation of electric powers in AC system C.5 Representation of electric powers in DC system Figure C.2 ā Representation of electric powers in AC system Figure C.3 ā Representation of electric powers in DC system |
40 | C.6 Power quality indices in DC system Figure C.4 ā Ripples |
41 | C.7 Illustration example of deformation power in DC system |
42 | C.8 Main conclusions on electric value computation in DC systems Figure C.5 ā DC powers Table C.1 ā Different powers |
43 | C.9 Need of characteristics of DC voltage Figure C.6 ā Compatibility level measured in differential mode values |
44 | Annex D (informative)District LVDC system demonstration project in Tongli, China D.1 Project overview D.2 Voltage level selection principle Figure D.1 ā Architecture of the district LVDC system in Tongli |
45 | D.3 System operation |
46 | Annex E (informative)An office building with general building utilities and office work places Figure E.1 ā Office building with general building utilities and office work places |
48 | Figure E.2 ā Overview of DC-zones for DC system |
51 | Table E.1 ā Aspects regarding the DC zone classification in DC installation |
52 | Annex F (informative)An example of configurations for active DC systems F.1 General F.2 Structure F.3 State of grid (SOG) Figure F.1 ā Active DC distribution system |
53 | Table F.1 ā Examples in case of 350/700 V DC systems |
54 | Figure F.2 ā DC distribution system with one load and one source Table F.2 ā Allowed voltages cable drop |
55 | Figure F.3 ā DC distribution system with more than one loadand a source and increasing source power Figure F.4 ā Distribution system with more than one loadand a source and DUMP LOAD active |
56 | Figure F.5 ā Distribution system with more than one loadand source in overloaded mode |
57 | Annex G (informative)Preferred voltage in different countries G.1 Preferred voltage in China Table G.1 ā Nominal voltage in LVDC distribution system |
58 | Table G.2 ā Nominal voltage in ELVDC equipment |
59 | G.2 Preferred voltage in the Netherlands Table G.3 ā Comparison between DC and AC system voltages |
60 | G.3 Preferred voltage in Germany Table G.4 ā Overview of the recommended voltage classes (VC)and the corresponding U2 and U3 values |
61 | Annex H (informative)Voltage with respect to earth Figure H.1 ā DC voltage definitions |
62 | Figure H.2 ā DC voltage bands relative to earth |
63 | Figure H.3 ā DC voltages to earth ā examples |
64 | Annex I (informative)CIGRE approaches for DC systems Figure I.1 ā Temporary DC pole to ground voltage profiles in DC systems |