ABSTRACT
This project was aimed at the design and implementation of a model automation system for an injection substation using Oluku 1x15MVA, 33/11kV injection substation. This model automation system designed can subsequently be adopted for use in automating injection substations. The project was limited to the simulation and testing of the DC auxiliaries protection of the transformer.
In designing this model automation system, the first step was to take the physical injection substation, that is, the Oluku 1×15MVA, 33/11KV injection substation into the software environment, by modeling the substation in the Totally Integrated Automation (TIA) Software v15. After modeling the substation, the control program was written for the DC auxiliary protective devices. This control program was written in Ladder logic using the Programmable Logic Controller(PLC) in the TIA portal. This control program was then linked to the Human Machine Interface (HMI). The HMI was also designed and modeled using the TIA portal and on the HMI screens were the functionalities of the control program displayed. Thereafter, the Recipe environment was created to fully automate the substation by taking over the responsibilities of the Distribution System Operator (DSO) on site. The results were then tested on a physical S7-1200 PLC + KTP400 Basic HMI starter kit.
The results of the simulation of the HMI and the Ladder logic codes showed that the various dc auxiliary protection schemes were able to detect a fault and ultimately alert the operator whilst also carrying out the duties of the distribution system operator (DSO) via application the recipe.
The main materials used for the implementation of this project were a laptop which was used to run the TIA portal software, S7-1200 PLC + KTP400 Basic HMI starter kit as well as the PLC Simulator.
