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Electrical safety monitoring systems - Insulation monitors
Kurka, Robin ; Bátora, Branislav (referee) ; Drápela, Jiří (advisor)
This thesis deals with solving the problem of insulation monitoring devices (IMD). The aim is to monitor the isolation status in the healthcare system, thus in an isolated power supply (IT) called the medical IT system. A summary of the used means and the used solutions of the way of supply from the point of view of reliability and safety were made to solve the problematics of the medical IT system.The thesis is based on an analysis of the experience of the use of IMD in medical IT system and also provides instructions for using IMD depending on the extent of their functions. The result of this thesis is a design of the electric power switchboard medical IT system with insulation monitoring device. A partial result of this thesis is the technical layout of the components inside the switchboard cabinet and their setting by means of a communication bus.
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Electrical safety monitoring systems - Insulation monitors
Kurka, Robin ; Bátora, Branislav (referee) ; Drápela, Jiří (advisor)
This thesis deals with solving the problem of insulation monitoring devices (IMD). The aim is to monitor the isolation status in the healthcare system, thus in an isolated power supply (IT) called the medical IT system. A summary of the used means and the used solutions of the way of supply from the point of view of reliability and safety were made to solve the problematics of the medical IT system.The thesis is based on an analysis of the experience of the use of IMD in medical IT system and also provides instructions for using IMD depending on the extent of their functions. The result of this thesis is a design of the electric power switchboard medical IT system with insulation monitoring device. A partial result of this thesis is the technical layout of the components inside the switchboard cabinet and their setting by means of a communication bus.
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The Indication of Earth Faults in Overhead Lines
Pospíšil, Zdeněk ; Topolánek, David (referee) ; Toman, Petr (advisor)
This master´s thesis deals with the indication and localization of earth faults in overhead lines. Earth fault is the most frequently occurring type of fault in medium voltage overhead lines – it covers approx. 95% of all faults and is very difficult to indicate and localize them correctly and in time with currently available methods on the market. Therefore is very important to study earth fault and its indication, localization. The thesis consists of a theoretical and a practical part. The theoretical part deals with faults in overhead networks with different type of neutral grounding, mainly with one phase to the ground fault in the compensated, ungrounded, solidly grounded and via resistance grounded networks. Most of the theoretical part is dedicated to one phase to the ground fault in the compensated and ungrounded networks, where this type fault is called the earth fault. In the compensated and ungrounded networks is described in details behavior – voltage and current relations during both steady state and transient state earth fault. The theoretical part is further dedicated to detection methods of earth faults and their preconditions for use. There is described also in details the complete procedure of earth fault detection, which includes indication, unhealthy feeder determination and exact position or line section localization. End of the theoretical part is then focused on determination of accuracy requirements for measurement of basic quantities and computation of other parameters. The practical part deals with a work at medium distribution network model, which includes familiarization with the model, detailed verification of its functionality and behavior during the earth fault, obtaining faults records and algorithmization of methods: method of qu – diagram and method of first half - period, which are able to detect unhealthy feeder. This part of the thesis was put together based on a demand of company Mega, corp., which wanted to verify function of both above mentioned and by them not yet tested methods.
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