Rectifier Cubicles


The rectifier is normally employed to supply energy to trolley bus, tram and underground lines.

The rectifier is available in a single unit having a simple Graetz bridge (six pulses) assembled inside a withdrawable trolley or in two units having two Graetz bridges (twelve pulses), either in parallel or in series connection, assembled inside two separate withdrawable trolleys.

The rectifier bridges are available with a single diode per arm or with four diodes in parallel per arm, one of them being redundant (immunity level np+1).

The rectifier bridges are protected from the overvoltage spikes by opportunely designed DC side snubber networks.

The rectifier section consists of a single unit in the case of a six pulses Graetz bridge or two separate units in parallel connection with interbridge reactor in the case of a twelve pulses rectifier. The rectifier can include the voltage and current measurements, the frame protection relay (64) and reverse current relay (32).

Technical characteristics

Applicable Standards:
EN 50123-6; 2003-02 (CEI EN50123-6; 2003-10)
EN 50328
Environmental and working conditions:
Installation type: Indoor
Working temperature range: -5 ÷ 40 °C
Construction type: One or two fixed units having a withdrawable trolley inside Protections: RC networks – Temperature sensors
Cooling: Natural air
Degree of protection:
IP3X relevant to the outside metal envelope
IP2X for the remaning separation (shutters included)
Weight and Dimensions:
Single withdrawable trolley weight: 250-300 kg
Dimensions: width x height x depth: 800 (2 x 800 in case of the twelve pulses configuration) x 2125 x 1800 mm
Main Electrical Characteristics:
Rated Voltage: 600 – 750 – 1500 V
Rated current : 1200 A
D.C. power (six pulses): 1200 kW
D.C. power (twelve pulses): 2000 kW
Withstand internal arc: 50kA x 300 ms