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Safety of transformers, reactors, power supply units and similiar products for supply voltages up to 1 100 V part 2-20: Particular requirements and tests for small reactors
Electrical drive engineering - input sided line choke for rectifiers or requency converters ,with or without energetic recovery system, increase the life-time of downstream components; commutator choke; direct link inverter; smoothing choke for DC-drives; balance choke; basic load choke; motor chokes at the inverter output to attenuate the steep voltage (du/dt) to e.g. < 500 V/µs protect the motor winding insulation and reduce disturbances; motor chokes related to capacitors as L-C filters or sinusoidal filters for an improved output signal additionally reduce frequency noise, spare screened motor feed lines, enable longer linse and improve the EMC; equal frequency chokes at the inverter output reduce common-mode-currents over the engine brackets against earth (ball bearing wearout, see also IEC 60034-25), in the easiest chase as a toroidal core over the power output.
Audio technology - rod core choke for frequency turnout; filter reactor; balance choke
Railway technology - air chokes are used in railway technology and in electric power transformation substation to smooth voltage peaks. Air chokes don’t switch to saturation when overloaded.
Reactance compensation units - three-phase filter circuit chokes, constructed for variously requried filtering factors p resp. resonance Resonanzfrequenzen ( fres = fNetz * ), with low inductance tolerance, linearity far over In, as protection of capacitors against tensile loading as a result of harmonics in nets, especially with rectifier load. The net impedance is improved in total.
EMC / suppression of interference – RFI-choke/rod core choke for line input; current compensated choke/filter choke (mostly a toroidal core of iron powder- or ferrite materials) to assemble interference suppression switches; line choke with sheets to attenuate current harmonics; protective conductor choke conform to VDE 0565 / EN 60938-1
Power electronics - series choke e.g. for current limitation, storage choke (magnetic energy W = ½ * L * I² ); PFC-choke for an increasement of power factor for switch-mode power supplies (EN 61000-3-2); filter reactor, resonance- and transduction choke for clocked batteries, resonance transformers etc.; ballast choke; two-phase direct link inductor to reduce harmonics, thyristor choke; symmetric choke; saturable choke
Communication engineering – intermediate frequency- and HF-choke
Test equipment – 1- or 3-phase load- and reactance choke
Switchboards – 1- or 3-phase line choke with series connection to achieve 4% Uk (short circuit voltage to net); limitation of start-up or current-inrush; attenuation of current harmonics conform EN 61000-3-2 (passive PFC), especially in units with rectifiers resp. DC link (inverter); balance choke; lockign choke; reactance choke.
Welding equipment – inverter loading choke; direct link choke; line choke; suppressor choke; commutation choke
Photovoltaik systems - pot core chokes are used to smooth high frequency ripples (e.g. 25 kHz) for inverters of photovoltaik systems
Further terms to this topic:
start-up current, commutation, idle current, iron core choke, harmonics, electrical engine, idle current compensation, motor choke, air choke, rod core choke, energy content
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