IEC 60633 pdf download

IEC 60633 pdf download Terminology for high-voltage direct current (HVDC) transmission
1 Scope
This International Standard defines terms for high-voltage direct current (HVDC) power transmission systems and for HVDC substations using electronic power converters for the conversion from a.c. to d.c. or vice versa.
This standard is applicable to HVDC substations with line commutated converters, most commonly based on three-phase bridge (double way) connections (see figure 2) in which unidirectional electronic valves, e.g. semiconductor valves, are used.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60050-551 :1 998, International Electrotechnical Vocabulary – Part 551: Power electronics
IEC 601 46-1 -1 :1 991 , General requirements and line commutated convertors – Part 1-1: Specifications of basic requirements
IEC 6061 7-5:1 996, Graphical symbols for diagrams – Part 5: Semiconductors and electron tubes
IEC 6061 7-6:1 996, Graphical symbols for diagrams – Part 6: Production and conversion of electrical energy
3 Symbols and abbreviations
The list covers only the most frequently used symbols. For a more complete list of the symbols which have been adopted for static converters see IEC 60027 and other standards listed in the normative references and the bibliography.
3.1 List of letter symbols
U d direct voltage (any defined value)
U d0 conventional no-load direct voltage
U di0 ideal no-load direct voltage
U dN rated direct voltage
U L line-to-line voltage on line side of converter transformer, r.m.s. value including harmonics
U LN rated value of U L
U ν0 no-load phase-to-phase voltage on the valve side of transformer, r.m.s. value excluding harmonics
3.2 List of subscripts
0 (zero) at no load
N rated value or at rated load
d direct current or voltage
i ideal
L line side of converter transformer
v valve side of converter transformer
max maximum
min minimum
n pertaining to harmonic component of order n
3.3 List of abbreviations
The following abbreviations are always in capital letters and without dots.
HVDC high-voltage direct current
MVU multiple valve (unit) (see 6.3.2)
SCR short-circuit ratio (see 7.32)
ESCR effective short-circuit ratio (see 7.33)
MTDC multiterminal HVDC transmission system (see 8.2.2)
MRTB metallic return transfer breaker (see 9.1 2)
ERTB earth return transfer breaker (see 9.1 3)
VDCOL voltage dependent current order limit (see 1 2.9)
4 Graphical symbols
Figure 1 shows the specific graphical symbols which are defined only for the purposes of this standard. For a more complete list of the graphical symbols which have been adopted for static converters, see IEC 6061 7-5 and IEC 6061 7-6.