Product category:
Industrial Drives/Controls
News Release from: ABB Automation Tech (Drives and Motors) | Subject: AC drives
Edited by the Engineeringtalk Editorial
Team on 29 November 2000
New sine filter for low voltage drives
Further adaptability for the ABB low voltage drive range is offered by the introduction of a new range of output sine filters.
Further adaptability for the ABB low voltage drive range is offered by the introduction of a new range of output sine filters The use of a sine filter in the inverter output reduces the high voltage rise times associated with modern IGBT power semiconductors, and expand the range of uses for a low voltage drive
This article was originally published on Engineeringtalk on 25 Feb 2000 at 8.00am (UK)
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A good sinusoidal output waveform will allow the use of the converter with an output transformer, without causing saturation of the magnetic circuit, and therefore can allow matching with medium voltage motors.
The sinusoidal waveform also minimises other phenomena, such as radiated emissions thus allowing the use of very long or even unscreened cables.
In addition motor noise will be decreased as will any de-rating due to the inverter output waveform.
This means that ABB's low voltage drive range - rated from 2.2 kW to 2520 kW, - can be used for many demanding applications, including Electro submersible pumps (ESPs) and for retrofitting to existing medium voltage motors- even non-standard motor voltages as high as 20 kV can be handled with a sine filter and step-up transformer.
As such, users get the dual benefit of low voltage drives, with their high reliability and spare parts stocks, along with the medium voltage drive benefits including smaller cables, as lower currents are used.
As harmonics in the output waveform are reduced there is no need to over dimension the output transformer, and in many cases a normal distribution transformer can be used.
The sine filter solution can also be used for low voltage motors with long cable runs, with limited insulation capabilities or to avoid the need for insulated bearings, and in addition existing cables can be reutilised.
The sine filter is available integrated into the drive enclosure from 144kW upwards, and is available with most standard protection classes and output connections.
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