System Solution to Solve Noise and Transients Beyond EN50155/EN50121-3-2
A regular customer of ours ran into problems during a locomotive retrofit. A battery chargers input circuit broke down repeatedly and the cause was identified as a combination of noise from the load and transients from pantograph bouncing. The noise and transient levels were way outside of the limits in EN50155 and EN50121-3-2, and more than what the battery charger could cope with. Knowing Powerbox as railway power supply experts the customer contacted us, asking for suggestions.
It was decided together with the customer filtering was the easiest and quickest way to go and within three weeks Powerbox designed and built an external low pass filter reducing noise and transients to the recommended levels, thereby protecting the battery charger.
The problem was solved and delays in the locomotive refit avoided. This was also both simpler and considerably cheaper than replacing or redesigning the existing battery charger.
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