Analysis of Protection Relay Malfunctioning in Medium Voltage Grids

The electrical power system generates and supplies electric energy to consumers and it must operate in a safe manner at all times. Despite its good performance, disturbances such as the occurrence of short circuits can always take place. Because short circuits cannot be prevented, the system must be able to recognize them and take corrective action. This is done by the different protective systems, which are implemented throughout the power system. Stedin is a Distribution System Operator (DSO) in the western part of the Netherlands. Stedin experienced that in case of short circuits in certain complex grid structures, the fault is not always detected adequately by the protective system and this results in mal-operation of the protection relays. Firstly, the cause of incorrect operation of the protective system in such network structures is studied in this thesis project. Secondly, there are certain condition strategies studied to try to prevent incorrect operation of the protective system in such networks. These include changes in the network structure, readjustments of protection relay settings and alternative protective schemes.

Subject

Power System Protection
Protection Relay
Short Circuit Analysis
Fault Current Detection

To reference this document use:

http://resolver.tudelft.nl/uuid:2eb664cc-dbe5-4274-bc6c-e33185bf64b7

Embargo date

2010-12-05

Part of collection

Student theses

Document type

master thesis

Rights

Files

PDF

MSc_Thesis_E.N._Parabirsi ... g_2010.pdf

1.77 MB

Close viewer