magistrsko delo
Abstract
Glavna naloga numerične distančne zaščite je, da iz izmerjenih linijskih napetosti in tokov pravilno določi impedanco pozitivnega zaporedja od relejne točke do mesta okvare. To lahko določimo z digitalnimi filtri ali uporabo modelno podprtih numeričnih algoritmov. Slednji temeljijo na RL- ali π-modelih vodov v diferenčni ali integralni obliki. V praksi je delovanje numerične distančne zaščite odvisno od različnih dejavnikov, ki lahko v nekaterih primerih privedejo do podaljšanja ali skrajšanja posameznih stopenj delovanja, kar se lahko kaže bodisi kot neselektivno bodisi kot zakasnjeno delovanje. Obravnavani algoritmi so ovrednoteni s simulacijami kratkih stikov, ki zajemajo vpliv aperiodične komponente toka, nasičenje tokovnih transformatorjev, napetost obloka, popačitve napetosti izvora in odstopanje frekvence omrežja. Validacija algoritmov je izvedena tudi z meritvami, dobljenimi v slovenskem prenosnem omrežju.
Keywords
zaščita prenosnih vodov;distančna zaščita;modelno podprti algoritmi;numerična zaščita;magistrske naloge;
Data
Language: |
Slovenian |
Year of publishing: |
2018 |
Typology: |
2.09 - Master's Thesis |
Organization: |
UM FERI - Faculty of Electrical Engineering and Computer Science |
Publisher: |
J. Knežič |
UDC: |
621.315:621.317.72(043.2) |
COBISS: |
21528086
|
Views: |
783 |
Downloads: |
111 |
Average score: |
0 (0 votes) |
Metadata: |
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Other data
Secondary language: |
English |
Secondary title: |
MODEL-BASED ALGORITHMS FOR NUMERICAL DISTANCE PROTECTION |
Secondary abstract: |
The main function of a numerical distance protection is correct estimation of an impedance for a positive sequencebetween relay point and fault location. The seen impedance can be estimated by digital filters or with use of numerical model-based algorithms. The latter are based on the RL- or π-line models, using differential or integral form. In practice, the operation of numerical distance protection depens on various factor, which may lead to overreaching or shortening of individual distance zones. This can result to a non-selective or delayed operation. All the discussed algorithms are evaluated using simulations of short circuits, considering aperiodic component in of a current, saturation of current transformers, arcing voltage, supply voltage distortions, as well as frequency deviation. Validation of algorithms was performed also for field measurments captured in Slovenian transmission network. |
Secondary keywords: |
protection of transmission lines;distance protection;model-based algorithms;numerical protection; |
URN: |
URN:SI:UM: |
Type (COBISS): |
Master's thesis/paper |
Thesis comment: |
Univ. v Mariboru, Fak. za elektrotehniko, računalništvo in informatiko, Elektrotehnika |
Pages: |
XIV, 69 f. |
ID: |
10933940 |