Executive Summary Hidden failures in protection systems for electric power networks can play significant roles in propagating small disturbances into wide-area disturbances. Hidden failures are incorrect operations of protection device that usually remain undetected until abnormal operating conditions occur. The objective of this research project was to investigate and demonstrate a new approac...

 Protective relays work in concert with sensing and control devices to accomplish their function. Under normal power system operation, a protective relay remains idle and serves no active function. But when fault or undesirable condition arrives Relay must be operated and function correctly.  A Power System consists of various electrical components like Generator, transformers, transmission l...

Maloperation of conventional relays is becoming prevalent due to ever increase in complexity of conventional power grids. They are dominant during power system contingencies like power swing, load encroachment, voltage instability, unbalanced loading, etc. In these situations, adaptive supervised wide-area backup protection (ASWABP) plays a major role in enhancing the power system reliability. ...

Power industry deregulation trend and proliferation of digital electronic devices are deeply affecting operations of power utility companies. Engineering departments, in particular, must deal with increasing complexity of existing applications as well as with emergence of new applications. Such an environment, creates many new challenges for protection system engineers. Use of new business mode...

Unlike traditional AC distribution systems, protection has been challenging for DC systems. Multi-terminal DC power systems do not have the years of practical experience and standards that AC power systems have. Also, the current power electronic devices cannot survive or sustain high magnitude faults. Converters will shut down to protect themselves under faulted conditions. This makes locating...

The undesired operation of zone 3 may be one of the most conspicuous protective relay features due to the incorrect zone 3 relay operations which have been conducive to the severity of blackouts. Therefore, determining the accurate zone 3 setting of the distance relay is deemed to be necessary. This paper focuses on the development of a new technique for calculating zone-3 setting of distance r...

Power system protection in electrical power engineering aims at eliminating a faulted part in an electric network from an otherwise healthy power system. Protection coordination involves a process of best timing any faulted currents so as to reduce the extension of outage areas to a minimum after a fault clearance. In the paper, innovative protection methods and devices widely based on computer...

This paper proposes a new strategy at the system level to evaluate and mitigate power system cascading outages adaptability considering protection system hidden failure. An explicit probability model of protection system hidden failures is established to demonstrate its effects on power system adaptability. The event tree is used to analyse the cascading outages sequences. Some adaptability ind...

Power system protection systems are designed to automatically take countermeasures against situations in power systems that are undesired. If these countermeasures are not taken the extent of the undesired situation will grow. This is an important aspect of the stochastic behaviour of power systems. A review is given of stochastic models of protection systems as described in literature. It is c...

This paper explores the relay protection of power grid with large-scale wind access across globe. First, amplitude and attenuation characteristics short circuit current in different types turbines are analyzed, as well contributing factors to short-circuit farms. Second, fault corresponding strategies collector plant discussed. Then, view adaptability HVDC access, performance zero-sequence prot...