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SY-EPC / Commercial-Units Lab |
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Yves THUREL
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Michel GEORGES
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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.
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?
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] VAC |
< 63 A | [0; 200] VDC | [0; 1000] ADC |
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 |
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| Surge Tests (1.2 μs / 50 μs) |
According to IEC 61000-4-5 |
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| 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 (Imonitor, Vmonitor, 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
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