Summary
Differential protection is one of the most popular protection functions utilized in the power systems for transmission lines. For differential protection to work correctly a robust communication system for receiving the current measurements and tripping information from the remote end of the line, is required. Traditionally the digital differential protection communication has been realized with protection device vendor specific proprietary communication protocols. Line differential protection is now moving from proprietary vendor specific protocol implementation to standard IEC 61850 protocol(s) and this is the first problem this paper intends to address. The second problem that this paper intends to take a stance on is that existing line differential protection methods usually use fibre optic communication only, which is costly and has distance limitations requiring the use of repeaters, consequently the paper proposes the use of the existing South African power utility telecommunication network.
Read more Read lessFurthermore, the paper presents a relevant and locally significant first step toward migrating line differential protection over packet-switched networks in South Africa. A laboratory simulated, virtual line differential protection trip switch was created using a user defined function block and a signal which is part of the Original Equipment Manufacturer (OEM) software for Intelligent Electronic Device’s (IED’s) engineering configuration. This virtual line differential protection trip is observed as it transverses various distances of fibre cable, with configurations requiring either internal or external synchronization. This paper is an initial step in analysing the performance of the line differential protection over a Packet-Switched Network
(PSN); therefore, it provides preliminary performance observations and considerations at a laboratory test environment. Line differential protection function is developed with a proprietary protocol by OEMs, and the GOOSE protocol for this function is still a user defined and user added feature therefore the paper proposes a combination of proprietary protocol and
GOOSE protocol, which is a step forward preparing for future interoperable systems. Both the laboratory simulated proprietary protocol and GOOSE protocol line differential protection trips were transmitted as over Internet Protocol (IP) - based communication network.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | D2_11275_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | South Africa |
| Study committees | |
| File size | 761 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
MZEKANDABA Zuko; GOSAI Tejin; VAN ZYL Stuart; LEHUTSO Ronny
Keywords
