BS EN 61377-1:2006 pdf download – Railway applications — Rolling stock — Part 1: Combined testing of inverter-fed alternating current motors and their control system
4 Environmental conditions Environmental conditions relative to motor, inverter, and control system are detailed in IEC 60349-2, IEC 61 287-1 and IEC 60571 .
5 Combined system characteristics
5.1 Specified characteristics Combined system specifications shall, as a general rule, include characteristic curves. These curves are defined as the “specified characteristics”. They shall be plotted to the designed operating limits of each variable. They shall generally be drawn for the d.c. supply voltage of the traction system at its specified nominal value. They may also be drawn for the lower and higher voltage of the supply of the traction system if agreed between user and manufacturer. These characteristics shall be drawn for a reference temperature of the windings of the motor of 1 50 °C, and the temperature of the parts of the inverter expected by the supplier. Figure 2 gives some examples of the points where d.c. voltage and current may be defined in order to have safe measurement conditions.
The specified characteristics shall be submitted to the user before the order for the combined system is placed, unless otherwise specified. The values of the supply voltage of the traction system shall be specified by the user. They should preferably be the standard values according to IEC 60850.
5.2 Declared characteristics Characteristic curves obtained from the results of type tests carried out in accordance with 7.5.
5.3 Combined system characteristics The specified and declared characteristics of the combined system shown as a function of speed, over the whole application range are:
a) external characteristics such as the mean mechanical torque, the mean values of the d.c. input: voltage, current and power of the combined system;
b) internal characteristics such as the root-mean-square value of the output current of the inverter, the root-mean-square of the fundamental components of the output current and voltage of the inverter, the slip of asynchronous motors, and the excitation current for synchronous motors; c) internal values such as switching transients, which are the point-to-point and point-to- earth peak voltage, temperatures, etc.
NOTE Internal switching transients are of use to check the dielectric test voltage of the constituents. If the efficiency is an important parameter, it shall be requested, and this characteristic shall also be shown. Efficiency is particularly important for combined systems used on thermal/electric rolling stock, or battery-fed vehicles. The efficiency characteristic of the combined system shall take into account the motor, the inverter, the cables and other relevant components.
The measurement of efficiency shall include excitation losses in the case of synchronous machines.
The characteristics shall be drawn at least for the maximum torque reference (main controller demand) over the entire speed range of the application, in motoring and braking if electric braking is proposed. Only external characteristics, and the maximum internal repetitive switching transients are mandatory..
The other internal characteristics and values shall be measured, but the results shall not influence the acceptance of the combined system. Figures 3 to 6 show examples of the most common mandatory curves.
5.4 Exchange of information and responsibility IEC 60349-2 and IEC 61 287-1 point out the need for the exchange of information between the motor supplier and the inverter supplier, to ensure that the combined system will meet the requirements of the above-mentioned standards, the documents recording this exchange of information being an integral part of the specification of the motor and of the inverter. Subclause 3.3 defines the manufacturer as the organization which has the technical responsibility for the supply of the combined system. As a consequence, it is responsible for the technical specification of the constituents of the combined system in order to meet the requirements of this standard.