Analysis of switching on selected electrical high voltage circuits
Journal Title: Mining – Informatics, Automation and Electrical Engineering - Year 2016, Vol 525, Issue 1
Abstract
Physical phenomena occurring in high-current contact systems of electric switches, when switching on unloaded transformers and capacitor banks, are much more dangerous than the phenomena occurring in the contact switch systems installed in other electric power systems. Switching on unloaded transformers may be accompanied by significant over-currents, greatly exceeding the nominal currents of the transformer. Connecting the capacities of capacitor banks causes transients in the circuit, leading to significant, fast over-currents and over-voltages. High-frequency currents may be transmitted by electromagnetic couplings to control circuits and other low-voltage circuits. The subject of the paper is the analysis of transient processes during switching on unloaded transformers and the capacities of capacitor banks. Additionally, the authors assess the impact of the power switching phase in particular circuits on the over-currents which arise there.
Authors and Affiliations
Stanisław Jan Kulas, Hendryk Supronowicz
Keywords
Related Articles
- EP ID EP283420
- DOI -
- Views 166
- Downloads 0
Improved safety in the use of electric energy in coal mines
The article features the possibilities to develop a high-speed switching device. The device has been designed to work in dangerouns coal mines with gas- and coal dust explosion hazards. Once the switch is implemented, th...
Estimating possible rate of injuries in coal mines
The article presents methods to calculate the values of injury rates in mines. The authors demonstrated how to estimate the value of compensation paid to the injured employees in the successive years (particularly next y...
Optimizing data transmission in communication systems which use magnetic couplings
Communication systems which make use of magnetic couplings are systems in which the transformation of signals is conducted through induction elements. These elements transfer and receive energy from the transportation un...
Breakdown of hoisting machine in mining shaft hoist installed in southern section of R-II shaft of KGHM Polska Miedź S.A. O/ZG Rudna
This article applies to a one-of-its-kind case of the cracking of the main shaft of a hoisting machine that occurred in the southern section of the R-II shaft of KGHM Polska Miedź S.A. Oddział ZG “Rudna” in 2011. The min...
How to assess and improve the quality of voice services in telephone communication and alarm systems in mines
The article presents selected objective and subjective methods to assess the quality of voice services in telephone communication. The authors described the impact of the line and acoustic echo phenomena and ambient nois...