NBN EN 60633 : 1999 AMD 2 2015

1 Scope
2 Normative references
3 Symbols and abbreviations
3.1 List of letter symbols
3.2 List of subscripts
3.3 List of abbreviations
4 Graphical symbols
5 General terms related to converter circuits
5.1 Conversion
5.2 Converter connections
5.3 Bridge (converter connection)
5.4 (Converter) arm
5.5 By-pass path
5.6 Commutation
5.7 Commutating group
5.8 Commutation inductance
5.9 Pulse number p
5.10 Commutation number q
6 Converter units and valves
6.1 Converter unit
6.2 (Converter) bridge
6.3 Valve
6.4 Main valve
6.5 By-pass valve
6.6 Thyristor module
6.7 Reactor module
6.8 Valve section
6.9 (Valve) thyristor level
6.10 Valve support
6.11 Valve structure
6.12 Valve interface (electronics) (unit)
6.13 Valve electronics
6.14 Valve arrester
6.15 Converter unit arrester
6.16 Converter unit d.c. bus arrester
6.17 Midpoint d.c. bus arrester
6.18 Valve (anode) (cathode) reactor
6.19 Converter transformer
6.20 By-pass switch
7 Converter operating conditions
7.1 Rectifier operation; rectification
7.2 Inverter operation: inversion
7.3 Forward direction
7.4 Reverse direction
7.5 Forward current
7.6 Reverse current
7.7 Forward voltage
7.8 Reverse voltage
7.9 Conducting state
7.10 Valve voltage drop
7.11 Non-conducting state; blocking state
7.12 Firing
7.13 (Valve) control pulse
7.14 (Valve) firing pulse
7.15 Converter blocking
7.16 Converter deblocking
7.17 Valve blocking
7.18 Valve deblocking
7.19 Phase control
7.20 (Trigger) delay angle
7.21 (Trigger) advance angle
7.22 Overlap angle
7.23 Extinction angle
7.24 Hold-off interval
7.25 Conduction interval
7.26 Blocking interval; idle interval
7.27 Forward blocking interval
7.28 Reverse blocking interval
7.29 False firing
7.30 Firing failure
7.31 Commutation failure
7.32 Short-circuit ratio (SCR)
7.33 Effective short-circuit ratio (ESCR)
8 HVDC systems and substations
8.1 HVDC system
8.2 HVDC transmission system
8.3 Unidirectional HVDC system
8.4 Reversible HVDC system
8.5 (HVDC) (system) pole
8.6 (HVDC) (system) bipole
8.7 Bipolar (HVDC) system
8.8 Monopolar (HVDC) system
8.9 HVDC substation
8.10 (HVDC) substation bipole
8.11 (HVDC) substation pole
8.12 HVDC transmission line
8.13 HVDC transmission line pole
8.14 Earth electrode
8.15 Earth electrode line
9 HVDC substation equipment
9.1 AC filter
9.2 DC (smoothing) reactor
9.3 DC reactor arrester
9.4 DC filter
9.5 DC damping circuit
9.6 DC surge capacitor
9.7 DC bus arrester
9.8 DC line arrester
9.9 HVDC substation earth
9.10 (DC) neutral bus capacitor
9.11 (DC) neutral bus arrester
9.12 Metallic return transfer breaker (MRTB)
9.13 Earth return transfer breaker (ERTB)
10 Modes of control
10.1 Control mode
10.2 Voltage control mode
10.3 Current control mode
10.4 Power control mode
10.5 Reactive power control mode
10.6 Frequency control mode
10.7 Damping control mode
11 Control systems
11.1 (HVDC) Control system
11.2 HVDC system control
11.3 (HVDC) master control
11.4 (HVDC system) bipole control
11.5 (HVDC system) pole control
11.6 (HVDC) substation control
11.7 Converter unit control
11.8 Valve control
12 Control functions
12.1 Equal delay angle control; individual phase control
12.2 Equidistant firing control
12.3 control
12.4 Minimum control
12.5 control
12.6 Minimum control
12.7 Control order
12.8 Current margin
12.9 Voltage dependent current order limit (VDCOL)
12.10 Pole (current) balancing
Figures
1 Graphical symbols
2 Bridge converter connection
3 Example of a converter unit
4 Commutation process at rectifier and inverter modes of operation
5 Illustrations of commutation in inverter operation
6 Typical valve voltage waveforms
7 Example of an HVDC substation
8 Example of a bipolar two-terminal HVDC transmission system
9 Example of a multiterminal bipolar HVDC transmission system
       with parallel connected HVDC substations
10 Example of a multiterminal bipolar HVDC transmission system
       with series connected HVDC substations
11 A simplified steady-state voltage-current characteristic of an
       HVDC system
12 Hierarchical structure of an HVDC control system
Bibliography
Annex ZA Normative references to international publications with
         their corresponding European publications

Covers 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. Applicable to HVDC substations with line commutated converters, most commonly based on three-phase bridge (double way) connections in which unidirectional electronic valves, e.g. semiconductor valves, are used.