Abstract
Double entry it is method of registration of economic operations accounting, applied to detect errors. The application of the method in differential protection leads to increased reliability of technical solutions. By providing redundant processing of information about currents measured at the ends of the protected object, and is formed in a special matrix that implements the reliable operation of the differential protection, eliminating its excessive action when damaged the current transformers or communication lines. To assess the reliability of protection used the method of Markov chains. The obtained results allow to make a conclusion about the prospects of implementing a differential protection using the method of double entry in the electrical networks.
Highlights
One of the promising directions of development of system of relay protection (SRP) is the establishment of the centralized differential protection (CDP)
Graphs of states and transitions for an absence of fault on the protected object mode a) the system includes a differential line protection (DLP) and differential busbar protection (DBP), b) SRP based on the CDP, c) SRP with the use of CDP and distributed protection DLP and DBP
The system of differential equations for the system includes a DLP and DBP and SRP based on the CDP describing the graph, are similar as (1) and, the expressions for functions of unreadiness probability and probability of failure-free operation will be similar
Summary
One of the promising directions of development of system of relay protection (SRP) is the establishment of the centralized differential protection (CDP). In accordance with the method of differential rings, the network is divided into several regions (fig.). In the process of functioning of protection there is a permanently diagnosis CT fault by checking on the presence of fault regions formed by the expanding of the zones of differential protection of installations to the CT on both ends of the protected object. The purpose of research is the development of highly reliable CDP with adaptation to the changes in the configuration of the electrical network. This problem is important in power systems with distributed generation, where the protection must react to dynamically changing network operation condition. Developed CDP may be applied both as main and as a backup
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