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CDN 3083 - S100M Manual surge coupling network

February 2008

With the prevailing high power consumption for industrial installations, the need for highcurrent couplers electronic controls goes along. Therefore a growing interest for high current coupling networks for EMC testing of entire assemblies is prevalent. At the same time the higher phase-to-phase voltages of industrial power supplies have to be matched. New draft standards take this tendency into account and specify the relevant properties of couplers for use at high current and voltage levels.


The manual coupling network CDN 3083 fulfils the requirements called for in the surge standard IEC/EN 61000-4-5: 2005, including the new features concerning high currents as well as in the ANSI C62.45 standard and other relevant standards.


The form of construction selected suits the demands placed on the instrument in its
working environment. In its basic form, the coupler is made for use on a floor or for
table top placement in an EMC laboratory or in a development workshop. It can be even mounted onto the wall to have free space on test bench, for instance.


High-current couplers often have to be taken to a test site when it is commonly impossible to move a large installation into the laboratory. For more convenience, the CDN 3083 can be disassembled in handy parts and can easily move to other places.


Wheels with braking features are included as standard accessory to be mounted to
manoeuvre the coupler even on ramps and uneven surfaces.


Injecting surge pulses into power connections always involves a careful weighing up
of partially conflicting requirements. On the one hand the power network has to be protected from the interference signals while the effects of the pulses are concentrated on the item under test, yet on the other hand the back filter must not result in any significant voltage drop.


In order to keep voltage losses within reasonable limits with increasing current levels, the IEC has defined three classes of filter inductances, namely: up to 20A, 20A to 60A and 60A to 100A. Classic high-current couplers cannot therefore be used any longer for lower current levels since the filtering effect is insufficient.


Through the use of special choke technology, Teseq has managed to avoid the costly disadvantage of using several couplers. By using an auto-adaptive back filter, the CDN 3083 fulfils the requirements for both protection and voltage drop over the range from just a few amps to full load.


Further construction features make the application of the unit even more universal.
The nominal maximum current rating of 100 A per phase can, during short test periods, be considerably exceeded. The unit will tolerate the frequently encountered inrush currents without complaint and, in extreme cases; it can be overstress until the internal environment have reached the maximum temperature.

The CDN 3083 is hence usable where otherwise a 100 A unit would be necessary. For single phase application even 200 A per phase is possible by paralleling 2 decoupling
network paths and adding decoupling units. The CDN 3083 is tested for safety in compliance with IEC 61010. The rugged connection terminals together with the solid earth line assure a proper connection, this in combination with a solid housing.

 

CDN 3083 Highlights:

  • For EUT power supplies up to 620 V
  • 100 A per phase with generous overload capacity
  • Complies with IEC/EN 61000-4-5 and ANSI C62.45
  • Easy upgradeable from IEC to ANSI coupling

 

orlando.holenstein@teseq.com

 

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