A Distance Protection System based on the Transputer has been developed in which the Distance Protection Scheme is modelled in Occam, a parallel processing language designed to support the concept of communicating sequential processes running on the Transputer. Two Data Acquisition arrangements have been investigated, one controlled by an Interfacing Transputer via Link Adaptors, the other making use of existing Protection Data Acquisition equipment controlled by the Interfacing Transputer through Dual Port RAM. In both cases other similar additional Transputer modules are interconnected with the Interfacing Transputer to form a parallel processing system for a Distance Protection Scheme. The Occam model of the Protection System has been developed around a central control program (Harness) which can be easily modified to accommodate different Protection algorithms. In addition the Occam Protection Harness incorporates features to allow it to fail safely or run on a single Transputer version of the Harness should the Transputer network fail. This arrangement provides a new approach in the development of Protection systems using multiple processing elements with an Occam Protection Harness that can accommodate different algorithms and Trip logic schemes. The Thesis describes the design of the system and indicates its performance capabilities and limitations. This research indicates that a full three phase distance protection scheme can be realised using four Transputers running simple short data window impedance calculating algorithms, together with post impedance processing and Trip logic. More complex algorithms will require additional faster Transputers but can be realised using the same Occam Protection Harness.

The master´s thesis deals with the design of medium voltage power line protection and the calculation of reliability indicators. First, it deals with the possibilities of power system operation. Subsequently, it divides the networks according to the grounding of the transformer node and the switching elements and devices occurring in the MV distribution network are mentioned. It presents the basic classification of power line protection and its use, especially it focuses on overhead and cable MV power lines. It also discusses the reliability of the power supply and lists the basic reliability indicators and their possible calculation. The practical part describes the changes in the considered area of the distribution network, where the reconstruction of the power line VN872 and a new way of powering the village Drnholec will take place. The impact of this change on the reliability of the supplied energy is also calculated. Furthermore, the protection of the power line is designed and the correctness of its setting is then verified on the model in the PSS Sincal software.