3adw000072r0601 dcs600 system description e f

For the connection of a power converter system to the

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Unformatted text preview: supply When thyristor power converters operate, the line voltage is short-circuited during commutation from one thyristor to the next. This operation causes voltage dips in the mains (point of common coupling). For the connection of a power converter system to the mains, one of the following configurations can be applied: Line PCC uk LR > 1% Line Configuration A Configuration C1 When using the power converter, a minimum of impedance is required to ensure proper performance of the snubber circuit. A line reactor can be used to meet this minimum impedance requirement. The value must therefore not drop below 1% uk (relative short circuit voltage). It should not exceed 10% uk, due to considerable voltage drops which would then occur. If 2 or more converters should be supplied by one transformer the final configuration depends on the number of drives in use and their power capability. Configuration A or B has to be used which are based on commutation chokes, if the drive system consists of any of the converters (C1, Line C2, A5, A6, A7). In case only two conConnecting point verters type A7 are involved no commutation chokes are necessary because the deLLR LLR LLR .... sign of these converters is adapted to that wiring. Configuration B If special requirements have to be met at the PCC (standards like EN 61 800-3, DC and AC drives at the same line, etc), different criteria must be applied for PCC selecting a line reactor. These requirements are often defined as a voltage dip LLR in percent of the nominal supply voltage. The combined impedance of ZLine and ZLR constitute the total series impedance of the installation. The ratio between the line impedance and the line reactor impedance determines the voltage dip at the connecting point. In such cases line chokes with an impedance around 4% are often used. LLine Line PCC Configuration C If an isolation transformer is used, it is possible to comply with certain connecting conditions per Configuration B without using an additional line reactor. The condition described in Configuration A will then likewise be satisfied, since the uk is >1 %. With reference to the power converter: The line reactors listed in table (2.6/1) - have been allocated to the units nominal current - are independent of converter's voltage classification; at some converter types the same line choke is used up to 690 V line voltage - are based on a duty cycle - can be used for DCS 600 as well as for DCF 600 converters You will find further information in publication: Technical Guide chapter: Line reactors II F 2-17 3ADW000072R0601 DCS600 System description e f Line reactors L1 DCS Type 400V-690V 50/60 Hz Line choke Design type for Fig. configur. A Line choke type for configur. B Design Fig. DCS60x-0025-41/51 DCS60x-0050-41/51 DCS60x-0050-61 DCS60x-0075-41/51 DCS60x-0100-41/51 DCS60x-0110-61 DCS60x-0140-41/51 ND01 ND02 ND03 ND04 ND06 ND05 ND06 1 1 1 1 1 1 1 ND401 ND402 on request ND403 ND404 on request ND405 4 4 5 5 5 DCS60x-0200-41/51 DCS60x-0250-41/51 DCS60x-0270-61 DCS60x-0350-41/51 DCS60x-0450-41/51 DCS60x-0450-61 DCS60x-0520-41/51 DCS60x-0680-41/51 DCS601-0820-41/51 DCS602-0820-41/51 DCS60x-1000-41/51 ND07 ND07 ND08 ND09 ND10 ND11 ND10 ND12 ND12 ND13 ND13 2 2 2 2 2 2 2 2 2 3 3 ND406 ND407 on request ND408 ND409 on request ND410 ND411 ND412 ND412 ND413 5 5 5 5 5 5 5 5 5 DCS60x-0903-61/71 DCS60x-1203-41/51 D...
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