This part gives guidance on variations to the specifications given in GB/T 3859.1 to enable the specification to be extended in a controlled form for special cases. Background information is also given on technical points which should facilitate the use of GB/T 3859.1.
This part primarily covers line commutated converters and is not in itself a specification, except as regards certain auxiliary components, in so far as existing standards may not provide the necessary data.
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.
GB/T 2900.33-2004 Electrotechnical Terminology — Power Electronics (IEC 60050-551:1998, IDT)
GB/T 3859.1-2013 Semiconductor Converters — General Requirements and Line Commutated Converters — Part 1-1: Specification of Basic Requirements (IEC 60146-1-1:2009, MOD)
GB/T 3859.3-2013 Semiconductor Converters — General Requirements and Line Commutated Converters — Part 1-3: Transformers and Reactors (IEC 60146-1-3:1991, MOD)
GB 4208 Degrees of Protection Provided by Enclosure (IP Code) (GB 4208-2008, IEC 60529:2001, IDT)
GB/T 10236 Guide for Compatibility and Protection of Interference Effects between Semiconductor Convertors and Power Supply System
GB/T 16935.1-2008 Insulation Coordination for Equipment within Low-voltage Systems — Part 1: Principles, Requirements and Tests (GB/T 16935.1-2008, IEC 60664-1:2007, IDT)
GB/T 17950 Semiconductor Converter — Part 6: Application Guide for the Protection of Semiconductor Converters Against Overcurrent by Fuses (GB/T 17950-2000, idt IEC 60146-6:1992)
GB/T 18494.1 Convertor Transformers — Part 1: Convertor Transformer for Industrial Applications (GB/T 18494.1-2001, idt IEC 61378-1:1997)
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 2900.33, GB/T 3859.1, several of which are repeated here for convenience, and the following apply.
3.1 Definitions related to converter faults
3.1.1
breakthrough
failure by which a controllable valve device or an arm consisting of such devices loses its ability to block voltage during the forward blocking interval
[GB/T 2900.34-2004, definition 551-16-60]
Note: Breakthrough can occur in rectifier operation as well as inverter operation and for various reasons, for example excessive junction temperature, voltage surges in excess of rated peak off-state voltage, excessive rate of rise of off-state voltage or spurious gate current. See Figure 1a).
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3.1.2
false firing
firing of a latching valve device or an arm consisting of such devices at an incorrect instant
[GB/T 2900.34-2004, definition 551-16-63]
3.1.3
breakdown (of an electronic valve device or of a valve arm)
failure that permanently deprives an electronic valve device or a valve arm of its property to block voltage
[GB/T 2900.34-2004, definition 551-16-66]
3.1.4
firing failure
failure to achieve conduction in a latching valve device or an arm consisting of such devices during the conduction interval
[GB/T 2900.34-2004, definition 551-16-65]
Note: See Figure 1b).
3.1.5
conduction through
in inverter operation, the situation that a valve arm continues conduction at the end of the normal conduction interval or at the end of the hold-off interval
[GB/T 2900.34-2004, definition 551-16-64]
Note: See Figure 1c).
3.1.6
commutation failure
failure to commutate the current from a conducting arm to the succeeding arm
[GB/T 2900.34-2004, definition 551-16-59]
3.2 Definitions related to converter generated transients
3.2.1
d.c. side transients
voltage transients produced by rapid changes of the d.c. voltage applied to the inductance and capacitance of the d.c. circuit
Note: See 7.4.
3.2.2
commutation transients on the line (repetitive transient)
voltage transients produced on the a.c. line after commutation
Note: See 7.4.