The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Recognizing that line-to-ground (L-G) faults are the most likely type of faults to occur, many industrial power systems are equipped with resistance grounded neutrals (NGR) to limit L-G fault currents. Limiting, identification and isolation of L-G fault currents prevents the progression of L-G faults into multiple phase faults with large fault currents and considerable damage to power systems. Under...
In neutral-isolated medium-voltage (MV) networks, the earth fault arc is typically extinguished by an automatic reclosing function. It causes a short interruption for the feeder in question. The earth fault arc can also be extinguished by using a shunt circuit breaker (SCB) to earth the faulty phase temporarily at the feeding, typically the 110/20 kV substation. The functioning of the SCB does not...
This paper proposes an improved stator ground fault protection scheme for the generator through injecting 20Hz voltage to realize the selectivity of the protection. The insulation resistance value of the generator is firstly calculated to determine whether or not ground fault occurring. When the ground fault happens, the 20Hz differential current between the neutral and terminal of each generator...
Reason was analyzed that cable monitor wire protection was easy to make incorrect operation and failure action led by the stray interference signals. Full-wave Fourier Algorithm was deduced which was realized by filtering decaying dc component using table lookup. And on this basis, protection principle of time-sharing amplitude ac cable monitor wire with terminal resistance was proposed and proved...
A lot of research is being performed in the field of lightning protection, beginning with lightning parameters and object reactions to these parameters, ending with electromagnetic wave propagation inside the object. All this is becoming very important with increased usage of microprocessor equipment. Several methodologies and various computer modeling programs are created which allow to determine...
This paper presents simulation and experimental testing being performed on electrical protection systems for Approach Lighting System (ALS) used in major US airports. The main focus of the investigations is to validate selected protection topology needed to safeguard critical Individual Control Cabinet (ICC) used by Federal Aviation Administration (FAA) in their ALS. The approach used is based on...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.