Electricity is a commodity and as such its quality should be evaluated.

The supply of electricity is essential in today’s society. The three pillars on which the entire electricity sector regulation is based are to guarantee the power supply, ensure the quality of supply and ensure that they perform at the lowest cost possible.

The lack of quality of electric power can adversely affect the devices connected to it.

A major package of technical standards has been developed, internationally accepted, regarding the identification and definition of parameters to assess the quality of electricity and how to measure to standardize them and, in turn, various intelligent electronic devices have been developed by industry which measure the wave energy  parameters and calculates the its quality, with a more than acceptable accuracy.

The administration, mainly, particularly in our country, the Ministry of Energy, which governs the electricity sector, has also defined the limits to be met by suppliers of the electricity to ensure the quality of the supply received by the consumer.

The railway is not excluded from this regulation and the various existing rules in this area are discussed in this article identifying the intrinsic problems of the rail and conducting an exercise attempt at extrapolation of current rules on the railway system, with the aim of deepening knowledge of this matter and have systems to assess the degree of compliance of this quality in the connection points of power to the rail system and, within that, when power is supplied to trains and facilities to obtain, if possible, an increasingly efficient rail operation.