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Resistor Over Voltage Protection called MUB is provided in the over voltage limitation circuit which is one of the main constituent of traction power convertor (Machine Room Equipment).

If the capacitance of DC-link capacitor bank is not sufficient to prevent the DC-link from sudden and inadmissible high transient over voltages, the over voltage protection (limitation) resistor is almost immediately connected across the DC link by the firing of a GTO in the Oil Cooled Valve Set with one arm for the Motor Convertor and one arm for the MUB Valve Set.


DRI Part No. : DRI/MUB/00
ABB Part No. : 3EHN424091P0025
Peak Surge Current : 1705 AMPS
Voltage :  2800 VAC
Grid Resistance at 20 ° C :  2.5 Ω ± 5%
Power Rating :  1000 kW
Job Weight :  45 Kg