Commercial-Units Lab

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Service Responsibles

Overview

Mandate

Range

Activities

Location

Design & Operation Responsibles

Yves THUREL	Project leader
Michel GEORGES	Tests, Qualification

Overview

CERN uses commercial units as well as home-made/designed power sources, mainly when commercial & off-the shelves solution doesn't correspond to CERN specific uses. This service check the compatibility of commercial units with regards to CERN requirements.

Mandate

SY-EPC organize a dedicated service to validate commercial power sources in order to evaluate they can be suitable for given applications.

Power Unit Technical Evaluation Flowchart .xmind

More info in this FAQ below:
What to expect from such internal service? How much time for a final report? Can i access result data? How is decided if a relevant commercial unit can be of interest or not? Power Supply of interest: Voltage or Current Source?

Range

Range of interest is defined below, reflecting the maximum coupling decoupling devices capability (voltage & current):

Input range		Output range
voltage	current	voltage	current
[1; 3] Phases [0; 400] V_AC	< 63 A	[0; 200] V_DC	[0; 1000] A_DC

Range

Activities

These technical points are part of a standard process to evaluate a commercial power source:

Type	Description	Comment	Standards / ref. Guide
Electrical Performances Evaluation	EMC-Emissions	Conducted Noise	According to IEC-61204-3 but also regarding internal limits, checked on both input and output sides, requiring specific apparatus.
	EMC-Immunity	Burst Tests (7 ns / 50 ns)	According to IEC 61000-4-4
	EMC-Immunity	Surge Tests (1.2 μs / 50 μs)	According to IEC 61000-4-5
	General Performances	Efficiency, Output Ripple, Voltage and current (if the case) Bandwidth...
	Input Line Variations	AC phase loss, Over-Voltage variations, Inrush current...
	Output Load Variations	Dynamic Response to sudden (0..100%, 50..100%) load variation.
Interfaces Evaluation Analogue & Digital	Interfaces	Digital signals: a review of signals available, the protocole, communication bus, and their compatibility with existing CERN systems. Analog signals: test of the integrity of these signals to evaluate if they should be directly used, to (I_monitor, V_monitor, etc...)
Control Integration using FGC controller	Controllability	Power source is controlled by a CERN FGC controller, with the addition of DCCTs, and performances are checked as a current source, in the current range [0.1; 100] % of nominal output current.
Mechanical Integration	Mechanical	A short document, with the analyse of internal construction, repairability, weight, fan location. Focus is put on a possible realization in a standard Power Rack.
Suitability Integration	Suitability	A short document, with a review of components choices: fuses, breaker (I.cu), fans, magnetics, but also a quick survey of the standards completion.
Documentation Review	Documentation	All documentation is gathered, and quickly evaluated.

Activities