- Number of documents: 35
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2SIS technology in MV Switchgear improves harsh environment and drastically reduces internal arc probability (CICED 2014-FP 0314)
For efficient smartgrid deployment, availability of MV networks is of high importance. MV switchgear play a key role for this purpose and more often, harsh environment withstand is required, thus...
CICED 2010-Advent of fixed type Disconnecting Circuit Breakers in Medium Voltage secondary switchgear: a new arrangement of main circuit functions
The purpose of this paper is to challenge some well-known arrangements of devices like racking trucks, disconnectors,circuit breakers and earthing switches. A new single line diagram will be...
Matpost 2011-Benefits of the functional approach in Standardization activity
Functionnal approach leads to a variety of technical solutions and opens the door to innovation. IEC, main international standardization frame for electrical switchgear, applies such approach based...
CICED 2012-The role of standards as enabler of optimized MV Switchgear design
Electrotechnical switchgear used for network operation has high stakes in term of safety and power availability. For this purpose, it is essential they rely on high level standards such as IEC,...
Matpost 2011-LPCT Allows rationalization of the protection chain
Traditionally the current measurement in the MV systems has been made with Current Transformers (CTs). The use of new technology called Low Power Current Transformer (LPCT) allows an evolution in...
CICED 2014-Is overvoltage protection useful in MV distribution equipment?
Relevancy of overvoltage protection on MV networks is discussed according to the network structure and the switching equipment installed. Over-voltages can be generated by natural phenomena like...
CICED 2014-Time to reconsider VT's implementation for a better reliability
In the smart grid deployment, more and more voltage transformers (VTs) are used to provide voltage measurements, for example for power measurement. In traditional switchboards, VTs were identified...
ISBN 2008-2. Compliance with insulation coordination
The behaviour under lightning is simulated numerically for vacuum switch-disconnectors (standard deviation StD of 16%) and gas switch-disconnectors (StD of 5%) in a critical case of a MV/LV...
CIGRE 2011 - Recovery and regeneration of SF6 at switchgear end of life is now a mastered
Sulphur Hexafluoride (SF6) gas has been used since approximately 1960 in electrical equipment for energy transmission and distribution at rated voltages above 1000 V. It is recognized as an ideal...
CICED 2008-Impact of Vacuum Switch-disconnectors
Using vacuum technology in 100% of distribution switchgears will increase the number of vacuum interrupters in the network by a factor of 20. Here a statistical analysis is used to evaluate the...
CICED 2008 - Capacitor Bank Switching with Vacuum Circuit Breakers
After interruption of a capacitive current sometimes Non Sustained Disruptive Discharges (NSDD’s) are observed when using vacuum circuit breakers. According to network calculations, NSDD’s...
CIRED 2013-Impact of medium voltage switchgear technology on operating modes in the network
The metal enclosed switchgear suitable for installation in MV / LV public distribution substations or private customer substations are key elements to ensure continuity of service in electricity...
Knowing status of an Earthing Switch in MV Switchgear, contact visibility or positive mechanical indication?
Safety of personnel operating or maintaining MV switchgear is crucial. When work needs to be done on an electrical installation, the equipment must be earthed, since earthing is what ensures the...
Time to reconsider VT's implementation for a better reliability
In the smart grid deployment, more and more voltage transformers (VTs) are used to provide voltage measurements, for example for power measurement. In traditional switchboards, VTs were...
Complete list of 'Cahiers Techniques'
CT 214 - Energy efficiency: benefits of variable speed control in pumps, fans and compressors
A large proportion of the electricity produced around the world is used to raise, move or pressurise liquids and gases with machines such as pumps, fans and compressors. Given the increasing...
The neutral: A live and unique conductor
Paradoxically, although the neutral conductor is a live conductor, current should never be allowed to circulate in it. Nevertheless, there has been renewed interest in the neutral conductor in...
Calculations for LV and HV networks
This Cahier Technique publication is intended to provide a general overview of the main electrotechnical calculations carried out in engineering studies on electrical systems at all voltage levels....
Electronic starters and variable speed drives
The most common way of starting asynchronous motors is directly on the line supply. This technique is often suitable for a wide variety of machines. However, it sometimes brings with it...