Czasopismo | ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA | Rocznik 2010 - zeszyt 7

Conventional and new methods of circuit breakers monitoring

nr katalogowy: 91898

The purpose of the network is to integrate protection and control functions with e-testing of switchgear secondary voltage equipment and e-diagnosis of Circuits Breakers during normal operation. Circuit Breakers (CB) are very important elements in the power system. They need to be reliable since their incorrect operation can cause major issues with power system protection and control. Due to large overloads that Circuit Breakers have to sustain when switching out shorted lines they are more susceptible to damage than other equipment and because of their cost they are expensive to replace. New methods of CB diagnosis have to be developed to increase the reliability of CB operation and to lower the power substation maintenance costs. Architecture of the system The architecture of the system, with implementation shown in a greater detail in one of the power substation, is presented in Fig. 1. Within each substation all communication is carried out according to IEC 61850 [1]. The controlling devices associated with each CB collect digitalized data from every possible electrical node of CB. The IEC 61850 wrapped data are then sent via SUBSTATION ETHERNET BUS to a CONCENTRATOR (CONC). The only processing of the data carried out at controlling devices is connected with protection functions implemented in it. It consists in determination of the Fourier spectrum of current and voltage signals, RMS values calculation and precise line frequency determination. The main software processing of diagnostic data coming from CBs is localized at the CONCENTRATOR. It consists first of all of procedures for parameterization of the waveforms obtained at various nodes of CB. Various features of signals are extracted like transition time, pulse duration, spectrum content, contacts bouncing times etc. The second part of the software installed at the CONCENTRATOR is an Expert System that makes conclusions concerning the conditions of individual C[...]

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ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA - PAKIET prenumerata PLUS (Prenumerata papierowa + dostęp do portalu sigma-not.pl + e-prenumerata)	636.00 zł brutto 588.89 zł netto 47.11 zł VAT (stawka VAT 8%)

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2010-7

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