The modernisation of the system for tracking and recording the power consumption of electric locomotives has imposed itself as a measure contributing to more rigorous knowledge of the operation duties specific to the railway traffic; thus, this action will lead to an increase of the safety on railway, traffic improvement and economic efficiency enhancement in passenger or freight transport.

The fact that the electric locomotive has the characteristic of relatively autonomous equipment favours the application of the flexible information systems based on unconventional sensors joined with a microprocessor able to perform many functions, not only the basic one, connected to the active energy metering, but also others such as: short-circuit protection, overload protection etc.

It is aimed at the placement of the current and voltage sensors on the 27 kV medium voltage bushing, by means of the connection between the contact wire and the power transformer from locomotive is made. The location of the sensors on the sensors on the bushing does not preclude preserving further on the classical transformer used at present.