The purpose of this thesis is to present and describe the online monitoring system for power transformer implemented within two projects, where we had to equip two different transformers with monitoring system. Demands of electricity quality and the utilization of electrical energy systems are constantly raising, therefore methods of ensuring reliable operation of power transformers becoming an increasingly important role. Several types of sensors, integrated in transformer monitoring systems are becoming more powerful with plenty of features, more reliable and economically acceptable. With real-time parameter control of power transformer and related sensing of the condition of transformer insulation system, it can be ensured shorter response time for preventive diagnosis, and therefore opportunity to avoid operation failure is greater. Transformers are one of the key and most valuable components in a power system. Equip them with an on-line monitoring system is essential for information gathering, condition assessment, better management and decision making. Users can have a view of all important parameters and meassuerement in whole life time period of transformer.
In introdoction part of this thesis are described general facts about monitoring system together with development guidelines fort this kind of monitoring systems. Followed by a description of the main functionalities and requirements and description of the architectual design of monitoring systems. In Chapter 4 are described building blocks and their requirements, which have been used for the implementation of the monitoring system. Building blocks include, in addition to hardware, also usage a variety of different software tools by means of which all the functionality of the implementation was carried out on the equipment. Hereinafter referred to thesis is described the realization of the control system on two different transformers. Through the comparison of the implementation there are some essential functionalitiy evident, by such a system must be provided. There are described both architectural design of the two presented systems, all used equipment and sensors, used software tools and used information technology. At the end of master's thesis is described the user interface control system, where it is clear what the control system allows to the user.