Search for dissertations about: "protection relays"
Showing result 1 - 5 of 9 swedish dissertations containing the words protection relays.
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1. On power quality and protection
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2. Line protection and Power System Collapse
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3. Power Quality Disturbances and Protective Relays
Abstract : This thesis combines knowledge from two areas: power quality and power system protection. Power quality concerns the effect of voltage disturbances on end-user equipment and of current disturbances on network components. Power system protection concerns the detection of faults in the system from measured voltages and currents. READ MORE
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4. Protection Strategies to Mitigate Major Power Systems Breakdowns
Abstract : 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. READ MORE
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5. Differential Protection for Arbitrary Three-Phase Power Transformers
Abstract : This thesis describes how to provide standardized, current based, differential protection for any three-phase power transformer, including phase-shifting transformers with variable phase angle shift and transformers of all construction types and internal on-load tap-changer configurations. The use of standard transformer differential protection for such applications is considered impossible in the protective relaying standards and practices currently applied. READ MORE