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ENVILINE™ TDR, WDR - Traction Diode Rectifier

The most reliable and cost effective rectification solutions for DC rail transportation.

To power trains, metros and trams, it is necessary to use an electronic power converter (traction rectifier) to convert alternating current into direct current. The ENVILINE TDR (Traction Diode Rectifier) and ENVILINE WDR (Withdrawable Diode Rectifier) are the most reliable and cost effective rectification solution for DC rail transportation.

We have more than 50 years of experience in design, construction and commissioning of Traction Diode Rectifiers. Based on the proven robust technology, we offer standard and tailored solutions to minimize cost and risk. More than a thousand of our units are in successful operation in various applications around the world. The London Underground and Polish national railway infrastructure are among our most recent references.

Type testing:
All rectifiers are compliant with EN50328, IEC60146 and IEEE 1653.2 and offer overload class according to these standards. 
 
Cooling:
Natural cooling ensures low noise and practically maintenance free operation.

Protection philosophy:
TDRs are designed to withstand output short circuit conditions greater than 150 ms allowing ample time for external protection systems to trip. Reliable over voltage and surge suppression passive circuits are used to protect diode rectifier modules, AC inputs, DC output as well as control circuits. Two levels of over temperature protection and two level diode protection for redundant designs are part of the many protection and monitoring options that are available to meet any of our customer’s needs. 

For more information, please refer to the product brochure in the Downloads section.

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The WDR offers the same functionality of a traditional traction diode rectifier (TDR), with the dif ference that the diode modules are installed on a removable trolley, accessible by the front of the unit.

Design
In applications with no rear access to the rectifier for maintainability, the withdrawable diode rectifier offers the flexibility of permitting back to the wall installation, while enabling access to the power components. The removable trolley consists of the power diode modules, its associated protection fuses, transient suppressors and is available as a 12 diode or an 18 diode cart. Flexible cart configurations make it possible to offer a variety of 6 or 12 pulse, 750 or 1500Vdc cubicles.

Safety
The WDR is equipped with a full set of safety features, such as locking system, overheat monitoring, voltage and current measurements, earth relay and overload protection. Control lamps on the front panel are indicating any type of trip or fault. In case of any issue, the cart can be easily replaced by the spare one. Continuous grounding is provided during cart inserting and withdrawing. Rotary pair of wheels at the front guarantee easy maneuvering.
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