This document is a report and manual on the work done by the author in the control system of a High Voltage Laboratory in the Corporate Research Center of ABB in Baden-Dättwil, Switzerland. The project consisted in implementing the possibility to run automatic test sequences in the Lab, which was before just controlled manually through a Console. To do so, the author had to first think and implement a communication system between all the components in the Lab (the old and the new ones); to then program the Controller running the Lab and a Touch Panel so the future users could configure the test sequences easily from a convenient interface. Regarding the document itself, first of all there is an introduction to the kind of experiments carried out in the Lab, like Lightning or Switching Impulse tests. Following, there is an overview and general explanation of the Lab: its whole functionality, how it is structured and the communication between the different parts, and possible circuits to build and ways to operate it. There is also a description of all the components in the Laboratory, explaining their main characteristics, how they work and what they are used for. The main part of the thesis, however, is the detailed documentation of the codes programmed for the Controller and the Touch Panel, and the manual on how to operate the control system of the Lab. These parts want to be useful for people carrying experiments in the Lab, so they should be understandable for not initiated people; but also for future updates of it, as an structured base for more automated sequences to be added and more functionalities to be implemented as soon as they are needed. Finally, there is a brief chapter dedicated to some little works done for improving parts of the Lab, like the implementation of a cooling system in the Control Rack of the Lab, or the study of the effects of the atmospheric conditions in some experiments carried out in the Laboratory.