scope:

This part of IEC 62888 specifies the requirements applicable to the Energy Measurement Function (EMF) of an Energy Measurement System (EMS) for use on board traction units for measurement of energy supplied directly from/to the Contact Line system.

This document also gives requirements for the Current Measurement Function (e.g. current sensor), the Voltage Measurement Function (e.g. voltage sensor) and the Energy Calculation Function (e.g. energy meter).

The conformance test arrangements for the Voltage Measurement Function, Current Measurement Function, the Energy Calculation Function and a complete Energy Measurement Function are also specified in this document.

This document has been developed taking into account that in some applications the EMF may be subjected to metrological assessment. All relevant metrological aspects are covered in this part and they are applicable to EMS Level 1.

Specific requirements for EMS Level 2 and Level 3 are specified in IEC 62888-6.

Figure 2 shows the flow between the functional blocks of the EMF. Only connections between the functional blocks required by this document are displayed.