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.
Static Var Compensator (SVC) is used to enhance the power flow in the transmission line by improving the voltage profile. SVC injects/draws the reactive power by varying its susceptance. This variation in susceptance offers new challenges to the ordinary protection techniques. The direction of superimposed energy (SE) can be used to discriminate between forward and reverse faults. However, SE depends...
Although the shunt Flexible AC Transmission System (FACTS) devices improve voltage profile, Shunt FACTS Devices (SFDs) may mal-operate the protection schemes due to reactive power injection. This study presents a phasor estimation-based pilot relaying for the SFD-compensated line. For a loaded line, the phase difference between the shunt FACTS device voltage and current is close to −90° as it injects...
Static Synchronous Compensator (STATCOM) is a high speed controllable reactive power compensator used to improve the voltage profile. STATCOM can inject/draw the reactive power by shifting the phase of its voltage relative to the bus voltage. The challenges in the presence of STATCOM have been reported in the existing literatures such as under/over-reaching of distance relays etc. In this study, a...
This paper presents a directional relaying scheme for series compensated transmission line, which is based on initial change in the Fault Component Energy (FCE). During pre-fault condition, FCE is zero and after the inception of forward fault, FCE is negative and for reverse faults, it is positive. If FCE remains negative or positive for consecutive 15 samples, the direction of the fault is detected...
This paper presents an improved directional relaying scheme for thyristor-controlled series capacitor (TCSC) compensated transmission line, which is based on the initial slope of the Fault Component Energy (FCE). The initial change in FCE is negative for forward faults and it is positive for reverse faults. The performance of the scheme is tested using PSCAD/EMTDC simulations and algorithm implemented...
This paper presents a fault detection and classification scheme for a shunt [static var compensator (SVC)] compensated line. The proposed relaying scheme is based on the concept of superimposed sequence components-based integrated impedance (SSCII). For an internal fault, the magnitude of SSCII is small and for an external fault, it is very large. In the SVC compensated line, a fault forces SVC to...
This paper presents a fault detection and classification scheme, based on integrated impedance, for SVC compensated transmission line. For internal faults, integrated impedance of faulty phase is low and for healthy phase, it is high. For all external faults, integrated impedances of all phases are high. The protection scheme based on this concept is used for variable impedance shunt compensation...
Induction motor is most commonly used drive in industrial applications. Many applications require precise speed control of induction motor drive with both steady state as well as dynamic state matching the desired pattern and in all cases immunity to disturbance is desired. In the past induction motors have been used for constant speed only but now due to availability of high performance, low loss...
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.