As a result of the standardization work that has been done for the distribution automation systems, the protection relays from different manufacturers become like each other, but on other hand, the new generations of devices will have more potential for new features. This thesis investigates how the different Web-technologies and design patters fit into embedded protection relays. As a part of the research, a marketing survey was conducted, which was used to find out the requirements for the Web-applications that are provided by the protection relay. It has also been investigated how the standardized way of modelling the devices can be used in the development of the Web-applications. Different Web, technologies and standardized ways t...