The digital protection relay for 550 kW - 1 MW asynchronous motors is investigated in this finishing work. In the theoretical chapter are examinated the structure of multifunctional protection relay, non-regular asynchronous motor operating conditions and their reasons. Two operating conditions are marked out, first - when supply current is changed, second - alternation in supply voltage. Next is made investigation of Siprotec 7SJ621 digital protection relay. There's made survey of 630 kW power asynchronous motor from non-regular operating konditions when there was overcurrent and overvoltage in the supply.
| Identifer | oai:union.ndltd.org:LABT_ETD/oai:elaba.lt:LT-eLABa-0001:E.02~2005~D_20050622_161057-37117 |
| Date | 22 June 2005 |
| Creators | Leonovas, Danielius |
| Contributors | Poška, Algimantas, Radzevičius, Lionginas, Matkevičius, Edvardas, Vilnius Gediminas Technical University |
| Publisher | Lithuanian Academic Libraries Network (LABT), Vilnius Gediminas Technical University |
| Source Sets | Lithuanian ETD submission system |
| Language | Lithuanian |
| Detected Language | English |
| Type | Master thesis |
| Format | application/pdf |
| Source | http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2005~D_20050622_161057-37117 |
| Rights | Unrestricted |
Page generated in 0.0129 seconds