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This page gives the detailed events which can be encountered on the CERN AC Mains network, and the way the converter is expected to react.
Some of the expected events on CERN networks are covered in these presentations:

  • CAS: Power Converters & Power Quality, 2014, K. Kahle .ppt.
  • TS: Disturbances & power quality of CERN's Electrical Network, 2004, K. Kahle .pdf.
  • Main Parameters of the LHC 400/230 V distribution System, from G Fernqvist, J Pererson 2000 .pdf
  • Courants harmoniques générés par des convertisseurs à pont de diodes, de V Montabonnet 2001 .edms


topCERN AC Mains

Whatever the output power is, any phase loss (partial or complete, on one or all phases) shall be treated adequately in the design not to lead to damping resistor or active component in the input side being stressed over-limit.

AC Mains Event Type Power Converter
Expected Behavior
Description Value Applicable
Standard		 A-Case
Transparent		 B-Case
Minor Dev.
Nominal Conditions VIN = 400 VAC,
fIN = 50 Hz		 - X  
Voltage variations dVIN = ±10 % of VIN   X  
Frequency variations ±0.5 % of fIN   X  
Voltage random step changes 1.5 % of VIN   X  
Max phase voltage unbalance ±2 % of VIN IEC 61000-2-4
class 3		 X  
Max total harmonic voltage-distortion Up to 10 % IEC 61000-2-4
class 3		 X
Voltage dip on one, two or three phases simultaneously Down to -20 % of VIN
Event duration ≤ 100 ms		   X
One complete phase loss, on any single phase Event duration ≤ 100 ms   X
≤80 % x PNOM		  
Event duration = infinite     X
≤80 % x PNOM
AC mains overvoltage, applied on the three phases simultaneously 1.5 x VIN = 600 VAC
Event duration ≤ 10 ms		     X
Phase to phase surge voltage,any combination possible 1000VPeak
1.2 µs / 50 µs		 IEC 61000-4-5
class 3		 X  
Phase to earth surge voltage, any combination possible 2000VPeak
1.2 µs / 50 µs		 IEC 61000-4-5
class 3		 X  

Description of AC Mains events and their impact on power converters .doc

A-Case B-Case
No component damage, the Power Supply shall continue operation by fulfilling its nominal performance. No component damage, the Power Supply shall not interrupt operation during the test: its performance may temporarily deviate, but it shall automatically recover in the shortest possible time after the end of the transient.

Criteria description

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