15 research outputs found
Ion-Flow Field Calculations of AC/DC Hybrid Transmission Lines
ISSN:0885-8977ISSN:1937-420
The impact of partly liquefied SF<inf>6</inf> on the dielectric performance of SF<inf>6</inf>-insulated switchgear
Novel Method for Predicting Limit Performance of Bus-Transfer Switching by Disconnectors
ISSN:0885-8977ISSN:1937-420
Theoretical Investigation of HVDC Disc Spacers Charging in SF6 Gas Insulated Systems
ISSN:1070-9878ISSN:1558-413
Improving GIS Disconnectors for Future HVDC Applications
The use of standard HVac disconnectors for bus-transfer switching in future HVdc gas insulated switchgear (GIS) has been demonstrated successfully in past research through simulation and testing. Prolonged arcing times through reignitions caused by high frequency harmonics as well as the proposed extension of GIS disconnector switching cases, however, create an HVdc-specific demand for more advanced disconnector concepts capable of withstanding higher switching stresses and increased recovery voltages. A spring-loaded disconnector designed for use in HVac mixed technology switchgear (MTS) was found to shorten the time to first current zero through an accelerated increase of the arcing voltage compared to standard disconnectors. Despite its increased switching performance, the reignition characteristics of this fast-acting disconnector were found to largely follow the previously established extinction criterion, which enables further simulation of similar technologies for HVdc applications. To additionally combat the issue of contamination of HVdc GIS by electrode erosion products, a prototype disconnector was improved using permanent magnets to evoke arc rotation. Erosion tests in air have shown an effective reduction of electrode erosion for long arcing times at currents typical for disconnector switching while bus-transfer tests revealed promising enhancements of the reignition behavior.ISSN:0885-8977ISSN:1937-420
The LHCb Silicon Tracker
Wide pitch silicon micro-strip detectors will be used in both the LHCb Inner Tracker and the Trigger Tracker. In total an area of 12 m will covered with silicon using ladders of up to 33 cm in length. The design of both detectors and corresponding test beam results are presented
The LHCb Silicon Tracker
LHCb is one of the experiments for the Large Hadron Collider
at CERN, dedicated to B-physics and CP-violation measurements.
To fully exploit the physics potential, a good tracking
performance with high effciency in a high particle density
environment close to the beam pipe is required. Silicon
strip detectors with large readout pitch and long strips
will be used for the LHCb Silicon Tracker. The design and
test beam results are presented here