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Bremsschopper

English translation: brake chopper

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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
German term or phrase:Bremschopper
English translation:brake chopper
Entered by: Cilian O'Tuama
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09:21 Mar 20, 2002
German to English translations [PRO]
Tech/Engineering
German term or phrase: Bremsschopper
railway connection, no context, item in a list
conny
Germany
Local time: 17:56
brake chopper
Explanation:
Dynamic / Regenerative Braking
To improve overall system efficiency, the recovery of kinetic energy from the rail vehicle in the form of dynamic or regenerative power braking is used. To make an induction motor regenerate, the inverter frequency is slightly lower than the motor frequency so producing negative torque. The negative torque generated produces current in the inverter that is fed to the DC bus and in the diesel electric case burned off as heat energy dissipated in the dynamic brake resistor grid. In electric rail cars the power can be fed back into the DC supply system.
In order to export this regenerative energy the DC supply voltage of the inverter is raised above the no load line value. If the line were not receptive the voltage would rise to a dangerous value, so a BRAKE CHOPPER is incorporated which switches on when the voltage reaches a certain value.
A major advantage of the VVVF inverter drive over conventional DC drive is that there are no changeover contacts required in the power circuit to achieve dynamic braking.
Selected response from:

Cilian O'Tuama
Local time: 17:56
Grading comment
Danke
4 KudoZ points were awarded for this answer

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Summary of answers provided
4 +2brake chopper
Cilian O'Tuama


  

Answers


23 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +2
brake chopper


Explanation:
Dynamic / Regenerative Braking
To improve overall system efficiency, the recovery of kinetic energy from the rail vehicle in the form of dynamic or regenerative power braking is used. To make an induction motor regenerate, the inverter frequency is slightly lower than the motor frequency so producing negative torque. The negative torque generated produces current in the inverter that is fed to the DC bus and in the diesel electric case burned off as heat energy dissipated in the dynamic brake resistor grid. In electric rail cars the power can be fed back into the DC supply system.
In order to export this regenerative energy the DC supply voltage of the inverter is raised above the no load line value. If the line were not receptive the voltage would rise to a dangerous value, so a BRAKE CHOPPER is incorporated which switches on when the voltage reaches a certain value.
A major advantage of the VVVF inverter drive over conventional DC drive is that there are no changeover contacts required in the power circuit to achieve dynamic braking.


Cilian O'Tuama
Local time: 17:56
Native speaker of: English
PRO pts in pair: 7232
Grading comment
Danke

Peer comments on this answer (and responses from the answerer)
agree  Endre Both: Definitely. The typo ("bremsschopper" instead of "bremschopper") tends to bring the less knowledgeable among us (like me) off track.
1 hr

agree  GBChrista
1 hr
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