# BS EN 50533:2011 pdf download

BS EN 50533:2011 pdf download.Railway applications —Three-phase train line voltage characteristics.

3 Terms, definitions and abbreviations

3.1 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1.1 three-phase train line

typically a 3-wire 3-wire and neutral wire line which distributes all along the train the three-phase electrical energy to the auxiliary loads, namely the loads dedicated to the traction systems and the loads for passenger comfort

3.1.2 fundamental frequency

frequency in the spectrum obtained from a Fourier transform of a time function, to which all the frequencies of the spectrum are referred

For the purpose of this European Standard, the fundamental frequency is the one delivered by the auxiliary converters installed on board.

3.1.3 harmonIc frequency

frequency which Is an Integer multiple of the fundamental frequency

3.1.4

harmonic component

component having a harmonic frequency. Its value is normally expressed as an r.m.s. value

3.1.5 interharmonic frequency

frequency which is not an integer multiple of the fundamental frequency, e.g. the switching frequency of the auxiliary converters and all the associated harmonics which are not multiple of the fundamental frequency

3.1.6 interharmonic component

component having an interharrnonic frequency. Its value is normally expressed as an r.m.s. value

3.1.7 harmonic order

ratio of the harmonic to the fundamental frequency is the harmonic order

3.1.8 total harmonic distortion (Till))

ratio of the r,m.s. value of the sum of all the harmonic components up to a specified order to the r.m.s. value of the fundamental component:

3.1.12 on board auxiliary power converter system

onboard subsystem which transforms electncal energy for traction auxiliary loads and comfort loads

3.1.13 linear loads

loads with a linear dependency between supply voltage and current. Additionally, loads producing negligible harmonic content compared to rated values are also regarded as linear loads in this European Standard. e.g. heating resistors, induction motors

3.1.14 non-linear loads

in contrast to linear loads, non-linear loads generate significant harmonic current or voltage content. These kinds of loads connected to a supply system with significant internal impedance will produce significant harmonic voltages, e.g. uncontrolled rectifiers and active front-end converters belong to this load group

3.1.15 unbalanced loads

loads which will cause unsymmetrical phase currents, ic. currents that have different amplitudes and I or phase angles in the three phases of a 3 AC supply system. Srigle phase loads connected to a 3 AC system are a representative example of unbalanced loads

3.1.16 common mode voltage (lc)

commonly defined as the arithmetic mean of the line-to-earth voltages, t = 1/3 (LIL1.E • L.5 • L!L.E)

3.2 AbbreviatIons

For the purposes of this document, the following abbreviations apply.

AC Alternating current

3 AC Three-phase Alternating Current

DC Direct Current

E Earth (or ground)

EDM Electrostatic Discharge Machining

EMC Electro-Magnetic Compatibility

L-E Line-to-Earth

L-1 Line-to-Line

L-N Line-to-Neutral

N Neutral

r.m.s. Root Mean Square

TDC Total Distortion Content

TDR Total Distortion Ratio

T1-fD Total Harmonic Distortion

Lice Common Mode Voltage at star point

4 Characteristics of the three-phase train line voltage

4.1 General

The characteristics of the three-phase train line are defined at the consumer side.

Figure 1 defines all the signals around a Y o star” connected three-phase load taken as an exampte, It should be no(ed that all the signals have to be considered, not only the line-to-line voltages across the load termInals but also the voltages between lines (Li. L2, L3) and earth or between the star point and earth. In this case ‘earth’ is referenced to the carbody potential.

The starpoint-to-earth voltage, here is identical to the common mode voltage U. These definitions are used in the tables below.