The latest achievements of world technology are applied during development and manufacturing of Pluton reliable rectifiers, basing on our long experience in electrical industry. This applies both to design of the cabinet and converter power part, as well as rectifier software, protection, diagnostics and control systems, electrical installation, maintenance and repair technology.
We offer a new development — highly reliable withdrawable rectifiers providing compactness, simplicity and ease of maintenance. Withdrawable rectifiers include fixed cabinet and withdrawable power unit connected by contacts system.
Pill power diodes of 25-26th class for current of 2500 ... 3000 A are applied in the rectifiers. Two diodes are connected in series in each arm of rectifier providing high reliability and long operation life in "diode-diode" circuit rectifiers. The current is force-divided between parallel branches by means of effective magnetic dividers providing division of current between parallel branches not worse than 5%.
Power semiconductor devices are protected against internal and external switching surges with RC-circuits and varistors in “diode-diode” circuit rectifiers. A damping capacitor is installed parallel to each power diode for surge protection in "diode-fuse" rectifier. The rectifier is protected with RC-filter (on DC side) against overvoltages from traction side and with varistor panel from power supply side.
Power high-speed fuses are installed in series with each diode in "diode-fuse" rectifier to protect against internal short circuits. Rectifiers are produced for various semiconductor failure modes (T, F and R modes) in accordance with EN 50328.
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).
Modern dry transformers with RESIBLOC® windings, capacity from 630 kVA, with various combinations of high (HV) and low (LV) voltages are supplied as traction transformer. Transformers have original design of HV and LV windings made of wire and foil. Windings are shrouded with epoxy-impregnated fiberglass string.
Rectifiers are manufactured both for indoor and outdoor arrangement. In case of outdoor arrangement control and diagnostic system is located separately and installed indoors or in a cabinet with regulated environment.
Rectifiers are manufactured with air natural and forced cooling. Forced air cooling is actually combined natural air and forced air cooling. Rectifier operates with natural cooling under loads lower or close to rated ones. In case of risk of overheating under overloads, fans are switched on and forcedly cool diodes. Fans switch off automatically in a period of time after overload disappearance.
Please contact us in case you have any technical queries, requests regarding customized procurement or delivery time of equipment.