Metal-clad rectifier semiconductor substations (hereinafter KVPP) are used for power supply of 230 V DC consumers, DC power supply of industrial plants workshop networks, including electric drive.
KVPP includes rectifier units of V-TPED series (converter sections + RESIBLOC® transformers), cabinets with automatic equipment, busbar bridges.
Power pill diodes 2500 А, 25th grade, are applied in the rectifier converting sections. Two diodes are connected in series in each rectifier arm for more reliability and lifetime prolongation. Forced current division in parallel paths is carried out due to the efficient magnetic dividers providing current division between parallel paths no less than 5 %.
In the rectifier converting sections semiconductor power devices are protected against internal and external switching overvoltage by RC circuits and varistors.
Galvanic isolation boards carry out protection against overvoltage due to RC circuits, generate data for analysis by the diagnostics system controller.
Pluton supplies modern dry transformers with RESIBLOC® windings, capacity from 630 kVA, with various combinations of high (HV) and low (LV) voltages. Transformers have original design of HV and LV windings that are made of wire and foil. Windings are capsulated by fiber-glass string soaked in epoxy.
The system is based on B&R (Austria) industrial controller 4PPC70 (with colored HMI panel) providing each diode parameters monitoring in dynamic mode during rectifier operation, diagnostics according to "breakdown", "overheating", "parameters derating", “no connection" criteria, as well as additional parameter "diode fault" for the circuits without parallel branches of diodes. These criteria diagnostics allows to significantly increase the period of rectifier trouble-free operation for more than 80000 hours (9 — 10 years).
The system also provides:
Cabinets with automatic equipment are provided for power supply and protection of 230 V DC circuits of iron and steel works crane substations.
Cabinets with automatic equipment include circuit-breakers of the leading European manufacturers (ABB, Schneider Electric) and have the following advantages:
capacitor bank for tripping device power supply support up to 5 s.
Please contact us in case you have any technical queries, requests regarding customized procurement or delivery time of equipment.