Sökning: "Transient protection"

Visar resultat 1 - 5 av 62 avhandlingar innehållade orden Transient protection.

  1. 1. Line protection and Power System Collapse

    Författare :Mattias Jonsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; voltage stability; numerical relays; power swings; transient stability; power swing detector; out of step protection; back-up protection; distance protection; distance protection statistics; power oscillations; adaptive relaying;

    Sammanfattning : .... LÄS MER

  3. 2. Protection Strategies to Mitigate Major Power Systems Breakdowns

    Författare :Mattias Jonsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; system protection schemes; transient instability; distance protection; power swing detectors; voltage instability; generator coherency; wide area protection; out-of-step protection;

    Sammanfattning : This thesis deals with new methods to improve the performance of power system protection in the case of voltage- and transient instability. These methods are designed primarily to mitigate power system breakdown. Relay algorithms are proposed where conventional distance protection is combined with additional relay criteria. LÄS MER

  4. 3. Multi-terminal HVDC protections based on transient line modeling

    Författare :Niclas Johannesson; Staffan Norrga; Hans-Peter Nee; Jef Berteen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HVDC transmission; HVDC protection; traveling wave protection; MTDC protection; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : High voltage direct current (HVDC) is considered one of the critical technologies required for the power system to enable the transition toward renewables. With an increasing geographical density of HVDC converters, there is a potential for optimization by connecting more than two converters into a shared DC transmission system, thus forming a multi-terminal HVDC (MTDC) system. LÄS MER

  5. 4. On Transient Noise and its Reduction in Hearing Aids

    Författare :Anders Gingsjö; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; gun shots; sound exposure; speech intelligibility; signal processing; transient reduction; hearing aid; transient noise;

    Sammanfattning : The most important property of a hearing aid is to facilitate verbal communication for hearing impaired people. However, tuning of the acoustical parameters in a hearing aid in order to optimize the speech intelligibility may result in a harsh and unpleasant sound. LÄS MER

  7. 5. Transient control in low-voltage power installation networks and electronic systems

    Författare :Hong Tang; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Transient protection; varistor; gas discharge protector; shielded cable; low-voltagepower installation; ATP-EMTP; spark gap; current generator; Fysik; Physics; Fysik; Electricity; Esp The Study Of Transients and Discharges; elektricitetslära; ssk studiet av transienter och urladdning;

    Sammanfattning : Transient protection in a low-voltage power installation network and an electronic system isof vital importance since most of the activities of our society are very dependent on thereliability of low-voltage power installation networks and electronic systems. This thesisconcentrates upon several investigations which all deal with the evaluation and improvementof the protection measures of low-voltage power installation networks and electronic systemsagainst electrical transients. LÄS MER