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.
Currently, distribution network operators face a number of challenges such as load growth, the proliferation of distributed generation (DG) and ageing infrastructure. This is drawing attention to dynamic thermal rating and coordinated distributed generation output control techniques which will allow the increased utilisation of power system assets to be realised. The work described in this paper was...
The electrical infrastructure will face great challenges with the coming energy transition to a sustainable and differentiated energy supply system. Although the existing grid is of reasonable age we believe that introduction of advanced secondary system technology will prolong the utilization of the current grid and shape it to become a flexible Smart Grid at acceptable cost. A visionary design will...
In recent years, progress in the development of communication network technology has been very rapid and Ethernet can now be applied to provide the backbone for wide area communication networks. Within this framework a Next Generation Network (NGN) that fuses mobile and fixed communication service interfaces is considered for the integration of a variety of data traffic types. This type of technology...
IEC 61850 offers significant advantages when compared against other substation communication protocols; in particular the replacement of analogue and binary signals with Ethernet messages reduces the cost of the system and improves flexibility and functionality. However, it also requires a new type of test bench suitable for the functional and performance testing of IEC 61850 compatible protection...
In this paper enhanced differential current protection scheme dedicated for HV transmission lines is described. The adaptive fuzzy relay scheme is proposed that combines strengths of both current and phase comparison protection criteria. The relay stabilization characteristic is adapted on-line depending on the output of the fuzzy reasoning scheme supplied with information from the phase comparison...
Conventional overload protective devices for induction motors like thermal, induction type, static and digital protection require motor current/s as the common parameter to be sensed accurately for reliable operation of the relay. The paper reports development of a novel overload cum short circuit protection relay for three phase induction motors without requiring motor current as its input parameter...
For the Delayed Auto-Reclose (DAR) and Autoswitching (ASW) systems in Mesh Corner circuits, taking into consideration the desire to minimise the overall system cost by reducing hardwired connections and auxiliary relays, the advanced multifunctional numerical relays with GOOSE (Generic Object Oriented Sub-Station Event) Communication interface via UCA2 (Utility Communication Architecture) protocol...
The paper analyses the existed protection of microgrid. And in order to meet the requirements of microgrid protection, a novel protection is presented in this paper. The protection based on local information without the need of communication, uses current traveling waves to identify faulted feeder, and the bus bar voltages to determine a event caused by fault or switch operation. In the protection...
Historically, the application of delayed auto-reclose and synchronising at mesh design substations has proven technically challenging, necessitating a bespoke and complex solution to providing this functionality. Coincident with the emergence of multifunctional relay- based solutions, circa 2000, National Grid recognised that both its asset replacement programme, and the expansion of the transmission...
A new approach using transient signals for earth fault location in non-solidly earthed overhead lines is presented. The characteristics of zero module network are analyzed in detail. Also, the product of zero-module voltage after Hilbert transform and zero-module current in selected frequency band is determined the direction of the fault. The earth fault can be located in accordance with the difference...
This paper developes a fault diagnosis system based on IEC61970 and IEC61850 standard series. The key problems in fault diagnosis system are the deficiency and standardization of distributed fault information. This fault diagnosis system get fault information mainly from SCADA and fault information system. The information from SCADA, including network topology and switch state, is modeled based on...
Phasor measurement units are power system devices that provide synchronized measurements of real-time phasors of voltages and currents. The aim of this paper is to provide comprehensive survey on optimum phasor measurement unit (PMU) for power system placement .The different Algorithm used for the optimum PMU placement is discussed in detail.
The Cost-effective solutions to improve system planning, operation, maintenance, and energy trading are achieved through wide area monitoring protection and control (WAMPAC). The most accurate and advanced timesynchronized technology available to power engineers and system operators for WAMPAC applications are phasor measurement units. This paper presents a comprehensive review on application of WAMPAC...
In view of the special structural characteristics of traction power supply system, the paper proposed a new method based on the principle of double-ended voltage travelling waves to make fault location. Double-ended travelling waves fault location avoids the drawbacks of impedance method, and it makes huge significance to the high-speed electrified railway of China. Application system of this method...
While special protection systems (SPSs) often shed load, recent sophisticated remedial action schemes (RASs) reduce or terminate generation output during an emergency condition. Under certain load conditions, generation newly added to previously balanced transmission grids creates system conditions that violate accepted reliability criteria.
In order to reduce customer hours lost (CHL) and customer interruptions (CI), the use of Faulted Phase Earthing (FPE) is being considered on the Irish 20kV distribution system. The operation of this particular FPE system is enabled by the use of a custom built Earth Fault Controller (EFC) that has the ability to detect high impedance faults of up to 12kµ. The EFC can also successfully identify single...
The integration of distributed generation transforms current distribution networks from vertically operated to horizontally operated. This transition leads to problems related to protection coordination. In the future, new protection philosophies should be applied which guarantee the increase of the during-fault distributed generation availability. The paper presents a protection scheme based on fault...
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.